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sqlglot.tokens

   1from __future__ import annotations
   2
   3import os
   4import typing as t
   5from enum import auto
   6
   7from sqlglot.errors import SqlglotError, TokenError
   8from sqlglot.helper import AutoName
   9from sqlglot.trie import TrieResult, in_trie, new_trie
  10
  11if t.TYPE_CHECKING:
  12    from sqlglot.dialects.dialect import DialectType
  13
  14
  15try:
  16    from sqlglotrs import (  # type: ignore
  17        Tokenizer as RsTokenizer,
  18        TokenizerDialectSettings as RsTokenizerDialectSettings,
  19        TokenizerSettings as RsTokenizerSettings,
  20        TokenTypeSettings as RsTokenTypeSettings,
  21    )
  22
  23    USE_RS_TOKENIZER = os.environ.get("SQLGLOTRS_TOKENIZER", "1") == "1"
  24except ImportError:
  25    USE_RS_TOKENIZER = False
  26
  27
  28class TokenType(AutoName):
  29    L_PAREN = auto()
  30    R_PAREN = auto()
  31    L_BRACKET = auto()
  32    R_BRACKET = auto()
  33    L_BRACE = auto()
  34    R_BRACE = auto()
  35    COMMA = auto()
  36    DOT = auto()
  37    DASH = auto()
  38    PLUS = auto()
  39    COLON = auto()
  40    DCOLON = auto()
  41    DQMARK = auto()
  42    SEMICOLON = auto()
  43    STAR = auto()
  44    BACKSLASH = auto()
  45    SLASH = auto()
  46    LT = auto()
  47    LTE = auto()
  48    GT = auto()
  49    GTE = auto()
  50    NOT = auto()
  51    EQ = auto()
  52    NEQ = auto()
  53    NULLSAFE_EQ = auto()
  54    COLON_EQ = auto()
  55    AND = auto()
  56    OR = auto()
  57    AMP = auto()
  58    DPIPE = auto()
  59    PIPE = auto()
  60    PIPE_SLASH = auto()
  61    DPIPE_SLASH = auto()
  62    CARET = auto()
  63    CARET_AT = auto()
  64    TILDA = auto()
  65    ARROW = auto()
  66    DARROW = auto()
  67    FARROW = auto()
  68    HASH = auto()
  69    HASH_ARROW = auto()
  70    DHASH_ARROW = auto()
  71    LR_ARROW = auto()
  72    DAT = auto()
  73    LT_AT = auto()
  74    AT_GT = auto()
  75    DOLLAR = auto()
  76    PARAMETER = auto()
  77    SESSION_PARAMETER = auto()
  78    DAMP = auto()
  79    XOR = auto()
  80    DSTAR = auto()
  81
  82    BLOCK_START = auto()
  83    BLOCK_END = auto()
  84
  85    SPACE = auto()
  86    BREAK = auto()
  87
  88    STRING = auto()
  89    NUMBER = auto()
  90    IDENTIFIER = auto()
  91    DATABASE = auto()
  92    COLUMN = auto()
  93    COLUMN_DEF = auto()
  94    SCHEMA = auto()
  95    TABLE = auto()
  96    WAREHOUSE = auto()
  97    STREAMLIT = auto()
  98    VAR = auto()
  99    BIT_STRING = auto()
 100    HEX_STRING = auto()
 101    BYTE_STRING = auto()
 102    NATIONAL_STRING = auto()
 103    RAW_STRING = auto()
 104    HEREDOC_STRING = auto()
 105    UNICODE_STRING = auto()
 106
 107    # types
 108    BIT = auto()
 109    BOOLEAN = auto()
 110    TINYINT = auto()
 111    UTINYINT = auto()
 112    SMALLINT = auto()
 113    USMALLINT = auto()
 114    MEDIUMINT = auto()
 115    UMEDIUMINT = auto()
 116    INT = auto()
 117    UINT = auto()
 118    BIGINT = auto()
 119    UBIGINT = auto()
 120    INT128 = auto()
 121    UINT128 = auto()
 122    INT256 = auto()
 123    UINT256 = auto()
 124    FLOAT = auto()
 125    DOUBLE = auto()
 126    DECIMAL = auto()
 127    DECIMAL32 = auto()
 128    DECIMAL64 = auto()
 129    DECIMAL128 = auto()
 130    DECIMAL256 = auto()
 131    UDECIMAL = auto()
 132    BIGDECIMAL = auto()
 133    CHAR = auto()
 134    NCHAR = auto()
 135    VARCHAR = auto()
 136    NVARCHAR = auto()
 137    BPCHAR = auto()
 138    TEXT = auto()
 139    MEDIUMTEXT = auto()
 140    LONGTEXT = auto()
 141    MEDIUMBLOB = auto()
 142    LONGBLOB = auto()
 143    TINYBLOB = auto()
 144    TINYTEXT = auto()
 145    NAME = auto()
 146    BINARY = auto()
 147    VARBINARY = auto()
 148    JSON = auto()
 149    JSONB = auto()
 150    TIME = auto()
 151    TIMETZ = auto()
 152    TIMESTAMP = auto()
 153    TIMESTAMPTZ = auto()
 154    TIMESTAMPLTZ = auto()
 155    TIMESTAMPNTZ = auto()
 156    TIMESTAMP_S = auto()
 157    TIMESTAMP_MS = auto()
 158    TIMESTAMP_NS = auto()
 159    DATETIME = auto()
 160    DATETIME2 = auto()
 161    DATETIME64 = auto()
 162    SMALLDATETIME = auto()
 163    DATE = auto()
 164    DATE32 = auto()
 165    INT4RANGE = auto()
 166    INT4MULTIRANGE = auto()
 167    INT8RANGE = auto()
 168    INT8MULTIRANGE = auto()
 169    NUMRANGE = auto()
 170    NUMMULTIRANGE = auto()
 171    TSRANGE = auto()
 172    TSMULTIRANGE = auto()
 173    TSTZRANGE = auto()
 174    TSTZMULTIRANGE = auto()
 175    DATERANGE = auto()
 176    DATEMULTIRANGE = auto()
 177    UUID = auto()
 178    GEOGRAPHY = auto()
 179    NULLABLE = auto()
 180    GEOMETRY = auto()
 181    POINT = auto()
 182    RING = auto()
 183    LINESTRING = auto()
 184    MULTILINESTRING = auto()
 185    POLYGON = auto()
 186    MULTIPOLYGON = auto()
 187    HLLSKETCH = auto()
 188    HSTORE = auto()
 189    SUPER = auto()
 190    SERIAL = auto()
 191    SMALLSERIAL = auto()
 192    BIGSERIAL = auto()
 193    XML = auto()
 194    YEAR = auto()
 195    UNIQUEIDENTIFIER = auto()
 196    USERDEFINED = auto()
 197    MONEY = auto()
 198    SMALLMONEY = auto()
 199    ROWVERSION = auto()
 200    IMAGE = auto()
 201    VARIANT = auto()
 202    OBJECT = auto()
 203    INET = auto()
 204    IPADDRESS = auto()
 205    IPPREFIX = auto()
 206    IPV4 = auto()
 207    IPV6 = auto()
 208    ENUM = auto()
 209    ENUM8 = auto()
 210    ENUM16 = auto()
 211    FIXEDSTRING = auto()
 212    LOWCARDINALITY = auto()
 213    NESTED = auto()
 214    AGGREGATEFUNCTION = auto()
 215    SIMPLEAGGREGATEFUNCTION = auto()
 216    TDIGEST = auto()
 217    UNKNOWN = auto()
 218    VECTOR = auto()
 219
 220    # keywords
 221    ALIAS = auto()
 222    ALTER = auto()
 223    ALWAYS = auto()
 224    ALL = auto()
 225    ANTI = auto()
 226    ANY = auto()
 227    APPLY = auto()
 228    ARRAY = auto()
 229    ASC = auto()
 230    ASOF = auto()
 231    ATTACH = auto()
 232    AUTO_INCREMENT = auto()
 233    BEGIN = auto()
 234    BETWEEN = auto()
 235    BULK_COLLECT_INTO = auto()
 236    CACHE = auto()
 237    CASE = auto()
 238    CHARACTER_SET = auto()
 239    CLUSTER_BY = auto()
 240    COLLATE = auto()
 241    COMMAND = auto()
 242    COMMENT = auto()
 243    COMMIT = auto()
 244    CONNECT_BY = auto()
 245    CONSTRAINT = auto()
 246    COPY = auto()
 247    CREATE = auto()
 248    CROSS = auto()
 249    CUBE = auto()
 250    CURRENT_DATE = auto()
 251    CURRENT_DATETIME = auto()
 252    CURRENT_TIME = auto()
 253    CURRENT_TIMESTAMP = auto()
 254    CURRENT_USER = auto()
 255    DECLARE = auto()
 256    DEFAULT = auto()
 257    DELETE = auto()
 258    DESC = auto()
 259    DESCRIBE = auto()
 260    DETACH = auto()
 261    DICTIONARY = auto()
 262    DISTINCT = auto()
 263    DISTRIBUTE_BY = auto()
 264    DIV = auto()
 265    DROP = auto()
 266    ELSE = auto()
 267    END = auto()
 268    ESCAPE = auto()
 269    EXCEPT = auto()
 270    EXECUTE = auto()
 271    EXISTS = auto()
 272    FALSE = auto()
 273    FETCH = auto()
 274    FILTER = auto()
 275    FINAL = auto()
 276    FIRST = auto()
 277    FOR = auto()
 278    FORCE = auto()
 279    FOREIGN_KEY = auto()
 280    FORMAT = auto()
 281    FROM = auto()
 282    FULL = auto()
 283    FUNCTION = auto()
 284    GLOB = auto()
 285    GLOBAL = auto()
 286    GRANT = auto()
 287    GROUP_BY = auto()
 288    GROUPING_SETS = auto()
 289    HAVING = auto()
 290    HINT = auto()
 291    IGNORE = auto()
 292    ILIKE = auto()
 293    ILIKE_ANY = auto()
 294    IN = auto()
 295    INDEX = auto()
 296    INNER = auto()
 297    INSERT = auto()
 298    INTERSECT = auto()
 299    INTERVAL = auto()
 300    INTO = auto()
 301    INTRODUCER = auto()
 302    IRLIKE = auto()
 303    IS = auto()
 304    ISNULL = auto()
 305    JOIN = auto()
 306    JOIN_MARKER = auto()
 307    KEEP = auto()
 308    KEY = auto()
 309    KILL = auto()
 310    LANGUAGE = auto()
 311    LATERAL = auto()
 312    LEFT = auto()
 313    LIKE = auto()
 314    LIKE_ANY = auto()
 315    LIMIT = auto()
 316    LIST = auto()
 317    LOAD = auto()
 318    LOCK = auto()
 319    MAP = auto()
 320    MATCH_CONDITION = auto()
 321    MATCH_RECOGNIZE = auto()
 322    MEMBER_OF = auto()
 323    MERGE = auto()
 324    MOD = auto()
 325    MODEL = auto()
 326    NATURAL = auto()
 327    NEXT = auto()
 328    NOTNULL = auto()
 329    NULL = auto()
 330    OBJECT_IDENTIFIER = auto()
 331    OFFSET = auto()
 332    ON = auto()
 333    ONLY = auto()
 334    OPERATOR = auto()
 335    ORDER_BY = auto()
 336    ORDER_SIBLINGS_BY = auto()
 337    ORDERED = auto()
 338    ORDINALITY = auto()
 339    OUTER = auto()
 340    OVER = auto()
 341    OVERLAPS = auto()
 342    OVERWRITE = auto()
 343    PARTITION = auto()
 344    PARTITION_BY = auto()
 345    PERCENT = auto()
 346    PIVOT = auto()
 347    PLACEHOLDER = auto()
 348    POSITIONAL = auto()
 349    PRAGMA = auto()
 350    PREWHERE = auto()
 351    PRIMARY_KEY = auto()
 352    PROCEDURE = auto()
 353    PROPERTIES = auto()
 354    PSEUDO_TYPE = auto()
 355    QUALIFY = auto()
 356    QUOTE = auto()
 357    RANGE = auto()
 358    RECURSIVE = auto()
 359    REFRESH = auto()
 360    RENAME = auto()
 361    REPLACE = auto()
 362    RETURNING = auto()
 363    REFERENCES = auto()
 364    RIGHT = auto()
 365    RLIKE = auto()
 366    ROLLBACK = auto()
 367    ROLLUP = auto()
 368    ROW = auto()
 369    ROWS = auto()
 370    SELECT = auto()
 371    SEMI = auto()
 372    SEPARATOR = auto()
 373    SEQUENCE = auto()
 374    SERDE_PROPERTIES = auto()
 375    SET = auto()
 376    SETTINGS = auto()
 377    SHOW = auto()
 378    SIMILAR_TO = auto()
 379    SOME = auto()
 380    SORT_BY = auto()
 381    START_WITH = auto()
 382    STORAGE_INTEGRATION = auto()
 383    STRAIGHT_JOIN = auto()
 384    STRUCT = auto()
 385    SUMMARIZE = auto()
 386    TABLE_SAMPLE = auto()
 387    TAG = auto()
 388    TEMPORARY = auto()
 389    TOP = auto()
 390    THEN = auto()
 391    TRUE = auto()
 392    TRUNCATE = auto()
 393    UNCACHE = auto()
 394    UNION = auto()
 395    UNNEST = auto()
 396    UNPIVOT = auto()
 397    UPDATE = auto()
 398    USE = auto()
 399    USING = auto()
 400    VALUES = auto()
 401    VIEW = auto()
 402    VOLATILE = auto()
 403    WHEN = auto()
 404    WHERE = auto()
 405    WINDOW = auto()
 406    WITH = auto()
 407    UNIQUE = auto()
 408    VERSION_SNAPSHOT = auto()
 409    TIMESTAMP_SNAPSHOT = auto()
 410    OPTION = auto()
 411    SINK = auto()
 412    SOURCE = auto()
 413
 414
 415_ALL_TOKEN_TYPES = list(TokenType)
 416_TOKEN_TYPE_TO_INDEX = {token_type: i for i, token_type in enumerate(_ALL_TOKEN_TYPES)}
 417
 418
 419class Token:
 420    __slots__ = ("token_type", "text", "line", "col", "start", "end", "comments")
 421
 422    @classmethod
 423    def number(cls, number: int) -> Token:
 424        """Returns a NUMBER token with `number` as its text."""
 425        return cls(TokenType.NUMBER, str(number))
 426
 427    @classmethod
 428    def string(cls, string: str) -> Token:
 429        """Returns a STRING token with `string` as its text."""
 430        return cls(TokenType.STRING, string)
 431
 432    @classmethod
 433    def identifier(cls, identifier: str) -> Token:
 434        """Returns an IDENTIFIER token with `identifier` as its text."""
 435        return cls(TokenType.IDENTIFIER, identifier)
 436
 437    @classmethod
 438    def var(cls, var: str) -> Token:
 439        """Returns an VAR token with `var` as its text."""
 440        return cls(TokenType.VAR, var)
 441
 442    def __init__(
 443        self,
 444        token_type: TokenType,
 445        text: str,
 446        line: int = 1,
 447        col: int = 1,
 448        start: int = 0,
 449        end: int = 0,
 450        comments: t.Optional[t.List[str]] = None,
 451    ) -> None:
 452        """Token initializer.
 453
 454        Args:
 455            token_type: The TokenType Enum.
 456            text: The text of the token.
 457            line: The line that the token ends on.
 458            col: The column that the token ends on.
 459            start: The start index of the token.
 460            end: The ending index of the token.
 461            comments: The comments to attach to the token.
 462        """
 463        self.token_type = token_type
 464        self.text = text
 465        self.line = line
 466        self.col = col
 467        self.start = start
 468        self.end = end
 469        self.comments = [] if comments is None else comments
 470
 471    def __repr__(self) -> str:
 472        attributes = ", ".join(f"{k}: {getattr(self, k)}" for k in self.__slots__)
 473        return f"<Token {attributes}>"
 474
 475
 476class _Tokenizer(type):
 477    def __new__(cls, clsname, bases, attrs):
 478        klass = super().__new__(cls, clsname, bases, attrs)
 479
 480        def _convert_quotes(arr: t.List[str | t.Tuple[str, str]]) -> t.Dict[str, str]:
 481            return dict(
 482                (item, item) if isinstance(item, str) else (item[0], item[1]) for item in arr
 483            )
 484
 485        def _quotes_to_format(
 486            token_type: TokenType, arr: t.List[str | t.Tuple[str, str]]
 487        ) -> t.Dict[str, t.Tuple[str, TokenType]]:
 488            return {k: (v, token_type) for k, v in _convert_quotes(arr).items()}
 489
 490        klass._QUOTES = _convert_quotes(klass.QUOTES)
 491        klass._IDENTIFIERS = _convert_quotes(klass.IDENTIFIERS)
 492
 493        klass._FORMAT_STRINGS = {
 494            **{
 495                p + s: (e, TokenType.NATIONAL_STRING)
 496                for s, e in klass._QUOTES.items()
 497                for p in ("n", "N")
 498            },
 499            **_quotes_to_format(TokenType.BIT_STRING, klass.BIT_STRINGS),
 500            **_quotes_to_format(TokenType.BYTE_STRING, klass.BYTE_STRINGS),
 501            **_quotes_to_format(TokenType.HEX_STRING, klass.HEX_STRINGS),
 502            **_quotes_to_format(TokenType.RAW_STRING, klass.RAW_STRINGS),
 503            **_quotes_to_format(TokenType.HEREDOC_STRING, klass.HEREDOC_STRINGS),
 504            **_quotes_to_format(TokenType.UNICODE_STRING, klass.UNICODE_STRINGS),
 505        }
 506
 507        klass._STRING_ESCAPES = set(klass.STRING_ESCAPES)
 508        klass._IDENTIFIER_ESCAPES = set(klass.IDENTIFIER_ESCAPES)
 509        klass._COMMENTS = {
 510            **dict(
 511                (comment, None) if isinstance(comment, str) else (comment[0], comment[1])
 512                for comment in klass.COMMENTS
 513            ),
 514            "{#": "#}",  # Ensure Jinja comments are tokenized correctly in all dialects
 515        }
 516        if klass.HINT_START in klass.KEYWORDS:
 517            klass._COMMENTS[klass.HINT_START] = "*/"
 518
 519        klass._KEYWORD_TRIE = new_trie(
 520            key.upper()
 521            for key in (
 522                *klass.KEYWORDS,
 523                *klass._COMMENTS,
 524                *klass._QUOTES,
 525                *klass._FORMAT_STRINGS,
 526            )
 527            if " " in key or any(single in key for single in klass.SINGLE_TOKENS)
 528        )
 529
 530        if USE_RS_TOKENIZER:
 531            settings = RsTokenizerSettings(
 532                white_space={k: _TOKEN_TYPE_TO_INDEX[v] for k, v in klass.WHITE_SPACE.items()},
 533                single_tokens={k: _TOKEN_TYPE_TO_INDEX[v] for k, v in klass.SINGLE_TOKENS.items()},
 534                keywords={k: _TOKEN_TYPE_TO_INDEX[v] for k, v in klass.KEYWORDS.items()},
 535                numeric_literals=klass.NUMERIC_LITERALS,
 536                identifiers=klass._IDENTIFIERS,
 537                identifier_escapes=klass._IDENTIFIER_ESCAPES,
 538                string_escapes=klass._STRING_ESCAPES,
 539                quotes=klass._QUOTES,
 540                format_strings={
 541                    k: (v1, _TOKEN_TYPE_TO_INDEX[v2])
 542                    for k, (v1, v2) in klass._FORMAT_STRINGS.items()
 543                },
 544                has_bit_strings=bool(klass.BIT_STRINGS),
 545                has_hex_strings=bool(klass.HEX_STRINGS),
 546                comments=klass._COMMENTS,
 547                var_single_tokens=klass.VAR_SINGLE_TOKENS,
 548                commands={_TOKEN_TYPE_TO_INDEX[v] for v in klass.COMMANDS},
 549                command_prefix_tokens={
 550                    _TOKEN_TYPE_TO_INDEX[v] for v in klass.COMMAND_PREFIX_TOKENS
 551                },
 552                heredoc_tag_is_identifier=klass.HEREDOC_TAG_IS_IDENTIFIER,
 553                string_escapes_allowed_in_raw_strings=klass.STRING_ESCAPES_ALLOWED_IN_RAW_STRINGS,
 554                nested_comments=klass.NESTED_COMMENTS,
 555                hint_start=klass.HINT_START,
 556                tokens_preceding_hint={
 557                    _TOKEN_TYPE_TO_INDEX[v] for v in klass.TOKENS_PRECEDING_HINT
 558                },
 559            )
 560            token_types = RsTokenTypeSettings(
 561                bit_string=_TOKEN_TYPE_TO_INDEX[TokenType.BIT_STRING],
 562                break_=_TOKEN_TYPE_TO_INDEX[TokenType.BREAK],
 563                dcolon=_TOKEN_TYPE_TO_INDEX[TokenType.DCOLON],
 564                heredoc_string=_TOKEN_TYPE_TO_INDEX[TokenType.HEREDOC_STRING],
 565                raw_string=_TOKEN_TYPE_TO_INDEX[TokenType.RAW_STRING],
 566                hex_string=_TOKEN_TYPE_TO_INDEX[TokenType.HEX_STRING],
 567                identifier=_TOKEN_TYPE_TO_INDEX[TokenType.IDENTIFIER],
 568                number=_TOKEN_TYPE_TO_INDEX[TokenType.NUMBER],
 569                parameter=_TOKEN_TYPE_TO_INDEX[TokenType.PARAMETER],
 570                semicolon=_TOKEN_TYPE_TO_INDEX[TokenType.SEMICOLON],
 571                string=_TOKEN_TYPE_TO_INDEX[TokenType.STRING],
 572                var=_TOKEN_TYPE_TO_INDEX[TokenType.VAR],
 573                heredoc_string_alternative=_TOKEN_TYPE_TO_INDEX[klass.HEREDOC_STRING_ALTERNATIVE],
 574                hint=_TOKEN_TYPE_TO_INDEX[TokenType.HINT],
 575            )
 576            klass._RS_TOKENIZER = RsTokenizer(settings, token_types)
 577        else:
 578            klass._RS_TOKENIZER = None
 579
 580        return klass
 581
 582
 583class Tokenizer(metaclass=_Tokenizer):
 584    SINGLE_TOKENS = {
 585        "(": TokenType.L_PAREN,
 586        ")": TokenType.R_PAREN,
 587        "[": TokenType.L_BRACKET,
 588        "]": TokenType.R_BRACKET,
 589        "{": TokenType.L_BRACE,
 590        "}": TokenType.R_BRACE,
 591        "&": TokenType.AMP,
 592        "^": TokenType.CARET,
 593        ":": TokenType.COLON,
 594        ",": TokenType.COMMA,
 595        ".": TokenType.DOT,
 596        "-": TokenType.DASH,
 597        "=": TokenType.EQ,
 598        ">": TokenType.GT,
 599        "<": TokenType.LT,
 600        "%": TokenType.MOD,
 601        "!": TokenType.NOT,
 602        "|": TokenType.PIPE,
 603        "+": TokenType.PLUS,
 604        ";": TokenType.SEMICOLON,
 605        "/": TokenType.SLASH,
 606        "\\": TokenType.BACKSLASH,
 607        "*": TokenType.STAR,
 608        "~": TokenType.TILDA,
 609        "?": TokenType.PLACEHOLDER,
 610        "@": TokenType.PARAMETER,
 611        "#": TokenType.HASH,
 612        # Used for breaking a var like x'y' but nothing else the token type doesn't matter
 613        "'": TokenType.UNKNOWN,
 614        "`": TokenType.UNKNOWN,
 615        '"': TokenType.UNKNOWN,
 616    }
 617
 618    BIT_STRINGS: t.List[str | t.Tuple[str, str]] = []
 619    BYTE_STRINGS: t.List[str | t.Tuple[str, str]] = []
 620    HEX_STRINGS: t.List[str | t.Tuple[str, str]] = []
 621    RAW_STRINGS: t.List[str | t.Tuple[str, str]] = []
 622    HEREDOC_STRINGS: t.List[str | t.Tuple[str, str]] = []
 623    UNICODE_STRINGS: t.List[str | t.Tuple[str, str]] = []
 624    IDENTIFIERS: t.List[str | t.Tuple[str, str]] = ['"']
 625    QUOTES: t.List[t.Tuple[str, str] | str] = ["'"]
 626    STRING_ESCAPES = ["'"]
 627    VAR_SINGLE_TOKENS: t.Set[str] = set()
 628
 629    # The strings in this list can always be used as escapes, regardless of the surrounding
 630    # identifier delimiters. By default, the closing delimiter is assumed to also act as an
 631    # identifier escape, e.g. if we use double-quotes, then they also act as escapes: "x"""
 632    IDENTIFIER_ESCAPES: t.List[str] = []
 633
 634    # Whether the heredoc tags follow the same lexical rules as unquoted identifiers
 635    HEREDOC_TAG_IS_IDENTIFIER = False
 636
 637    # Token that we'll generate as a fallback if the heredoc prefix doesn't correspond to a heredoc
 638    HEREDOC_STRING_ALTERNATIVE = TokenType.VAR
 639
 640    # Whether string escape characters function as such when placed within raw strings
 641    STRING_ESCAPES_ALLOWED_IN_RAW_STRINGS = True
 642
 643    NESTED_COMMENTS = True
 644
 645    HINT_START = "/*+"
 646
 647    TOKENS_PRECEDING_HINT = {TokenType.SELECT, TokenType.INSERT, TokenType.UPDATE, TokenType.DELETE}
 648
 649    # Autofilled
 650    _COMMENTS: t.Dict[str, str] = {}
 651    _FORMAT_STRINGS: t.Dict[str, t.Tuple[str, TokenType]] = {}
 652    _IDENTIFIERS: t.Dict[str, str] = {}
 653    _IDENTIFIER_ESCAPES: t.Set[str] = set()
 654    _QUOTES: t.Dict[str, str] = {}
 655    _STRING_ESCAPES: t.Set[str] = set()
 656    _KEYWORD_TRIE: t.Dict = {}
 657    _RS_TOKENIZER: t.Optional[t.Any] = None
 658
 659    KEYWORDS: t.Dict[str, TokenType] = {
 660        **{f"{{%{postfix}": TokenType.BLOCK_START for postfix in ("", "+", "-")},
 661        **{f"{prefix}%}}": TokenType.BLOCK_END for prefix in ("", "+", "-")},
 662        **{f"{{{{{postfix}": TokenType.BLOCK_START for postfix in ("+", "-")},
 663        **{f"{prefix}}}}}": TokenType.BLOCK_END for prefix in ("+", "-")},
 664        HINT_START: TokenType.HINT,
 665        "==": TokenType.EQ,
 666        "::": TokenType.DCOLON,
 667        "||": TokenType.DPIPE,
 668        ">=": TokenType.GTE,
 669        "<=": TokenType.LTE,
 670        "<>": TokenType.NEQ,
 671        "!=": TokenType.NEQ,
 672        ":=": TokenType.COLON_EQ,
 673        "<=>": TokenType.NULLSAFE_EQ,
 674        "->": TokenType.ARROW,
 675        "->>": TokenType.DARROW,
 676        "=>": TokenType.FARROW,
 677        "#>": TokenType.HASH_ARROW,
 678        "#>>": TokenType.DHASH_ARROW,
 679        "<->": TokenType.LR_ARROW,
 680        "&&": TokenType.DAMP,
 681        "??": TokenType.DQMARK,
 682        "~~~": TokenType.GLOB,
 683        "~~": TokenType.LIKE,
 684        "~~*": TokenType.ILIKE,
 685        "~*": TokenType.IRLIKE,
 686        "ALL": TokenType.ALL,
 687        "ALWAYS": TokenType.ALWAYS,
 688        "AND": TokenType.AND,
 689        "ANTI": TokenType.ANTI,
 690        "ANY": TokenType.ANY,
 691        "ASC": TokenType.ASC,
 692        "AS": TokenType.ALIAS,
 693        "ASOF": TokenType.ASOF,
 694        "AUTOINCREMENT": TokenType.AUTO_INCREMENT,
 695        "AUTO_INCREMENT": TokenType.AUTO_INCREMENT,
 696        "BEGIN": TokenType.BEGIN,
 697        "BETWEEN": TokenType.BETWEEN,
 698        "CACHE": TokenType.CACHE,
 699        "UNCACHE": TokenType.UNCACHE,
 700        "CASE": TokenType.CASE,
 701        "CHARACTER SET": TokenType.CHARACTER_SET,
 702        "CLUSTER BY": TokenType.CLUSTER_BY,
 703        "COLLATE": TokenType.COLLATE,
 704        "COLUMN": TokenType.COLUMN,
 705        "COMMIT": TokenType.COMMIT,
 706        "CONNECT BY": TokenType.CONNECT_BY,
 707        "CONSTRAINT": TokenType.CONSTRAINT,
 708        "COPY": TokenType.COPY,
 709        "CREATE": TokenType.CREATE,
 710        "CROSS": TokenType.CROSS,
 711        "CUBE": TokenType.CUBE,
 712        "CURRENT_DATE": TokenType.CURRENT_DATE,
 713        "CURRENT_TIME": TokenType.CURRENT_TIME,
 714        "CURRENT_TIMESTAMP": TokenType.CURRENT_TIMESTAMP,
 715        "CURRENT_USER": TokenType.CURRENT_USER,
 716        "DATABASE": TokenType.DATABASE,
 717        "DEFAULT": TokenType.DEFAULT,
 718        "DELETE": TokenType.DELETE,
 719        "DESC": TokenType.DESC,
 720        "DESCRIBE": TokenType.DESCRIBE,
 721        "DISTINCT": TokenType.DISTINCT,
 722        "DISTRIBUTE BY": TokenType.DISTRIBUTE_BY,
 723        "DIV": TokenType.DIV,
 724        "DROP": TokenType.DROP,
 725        "ELSE": TokenType.ELSE,
 726        "END": TokenType.END,
 727        "ENUM": TokenType.ENUM,
 728        "ESCAPE": TokenType.ESCAPE,
 729        "EXCEPT": TokenType.EXCEPT,
 730        "EXECUTE": TokenType.EXECUTE,
 731        "EXISTS": TokenType.EXISTS,
 732        "FALSE": TokenType.FALSE,
 733        "FETCH": TokenType.FETCH,
 734        "FILTER": TokenType.FILTER,
 735        "FIRST": TokenType.FIRST,
 736        "FULL": TokenType.FULL,
 737        "FUNCTION": TokenType.FUNCTION,
 738        "FOR": TokenType.FOR,
 739        "FOREIGN KEY": TokenType.FOREIGN_KEY,
 740        "FORMAT": TokenType.FORMAT,
 741        "FROM": TokenType.FROM,
 742        "GEOGRAPHY": TokenType.GEOGRAPHY,
 743        "GEOMETRY": TokenType.GEOMETRY,
 744        "GLOB": TokenType.GLOB,
 745        "GROUP BY": TokenType.GROUP_BY,
 746        "GROUPING SETS": TokenType.GROUPING_SETS,
 747        "HAVING": TokenType.HAVING,
 748        "ILIKE": TokenType.ILIKE,
 749        "IN": TokenType.IN,
 750        "INDEX": TokenType.INDEX,
 751        "INET": TokenType.INET,
 752        "INNER": TokenType.INNER,
 753        "INSERT": TokenType.INSERT,
 754        "INTERVAL": TokenType.INTERVAL,
 755        "INTERSECT": TokenType.INTERSECT,
 756        "INTO": TokenType.INTO,
 757        "IS": TokenType.IS,
 758        "ISNULL": TokenType.ISNULL,
 759        "JOIN": TokenType.JOIN,
 760        "KEEP": TokenType.KEEP,
 761        "KILL": TokenType.KILL,
 762        "LATERAL": TokenType.LATERAL,
 763        "LEFT": TokenType.LEFT,
 764        "LIKE": TokenType.LIKE,
 765        "LIMIT": TokenType.LIMIT,
 766        "LOAD": TokenType.LOAD,
 767        "LOCK": TokenType.LOCK,
 768        "MERGE": TokenType.MERGE,
 769        "NATURAL": TokenType.NATURAL,
 770        "NEXT": TokenType.NEXT,
 771        "NOT": TokenType.NOT,
 772        "NOTNULL": TokenType.NOTNULL,
 773        "NULL": TokenType.NULL,
 774        "OBJECT": TokenType.OBJECT,
 775        "OFFSET": TokenType.OFFSET,
 776        "ON": TokenType.ON,
 777        "OR": TokenType.OR,
 778        "XOR": TokenType.XOR,
 779        "ORDER BY": TokenType.ORDER_BY,
 780        "ORDINALITY": TokenType.ORDINALITY,
 781        "OUTER": TokenType.OUTER,
 782        "OVER": TokenType.OVER,
 783        "OVERLAPS": TokenType.OVERLAPS,
 784        "OVERWRITE": TokenType.OVERWRITE,
 785        "PARTITION": TokenType.PARTITION,
 786        "PARTITION BY": TokenType.PARTITION_BY,
 787        "PARTITIONED BY": TokenType.PARTITION_BY,
 788        "PARTITIONED_BY": TokenType.PARTITION_BY,
 789        "PERCENT": TokenType.PERCENT,
 790        "PIVOT": TokenType.PIVOT,
 791        "PRAGMA": TokenType.PRAGMA,
 792        "PRIMARY KEY": TokenType.PRIMARY_KEY,
 793        "PROCEDURE": TokenType.PROCEDURE,
 794        "QUALIFY": TokenType.QUALIFY,
 795        "RANGE": TokenType.RANGE,
 796        "RECURSIVE": TokenType.RECURSIVE,
 797        "REGEXP": TokenType.RLIKE,
 798        "RENAME": TokenType.RENAME,
 799        "REPLACE": TokenType.REPLACE,
 800        "RETURNING": TokenType.RETURNING,
 801        "REFERENCES": TokenType.REFERENCES,
 802        "RIGHT": TokenType.RIGHT,
 803        "RLIKE": TokenType.RLIKE,
 804        "ROLLBACK": TokenType.ROLLBACK,
 805        "ROLLUP": TokenType.ROLLUP,
 806        "ROW": TokenType.ROW,
 807        "ROWS": TokenType.ROWS,
 808        "SCHEMA": TokenType.SCHEMA,
 809        "SELECT": TokenType.SELECT,
 810        "SEMI": TokenType.SEMI,
 811        "SET": TokenType.SET,
 812        "SETTINGS": TokenType.SETTINGS,
 813        "SHOW": TokenType.SHOW,
 814        "SIMILAR TO": TokenType.SIMILAR_TO,
 815        "SOME": TokenType.SOME,
 816        "SORT BY": TokenType.SORT_BY,
 817        "START WITH": TokenType.START_WITH,
 818        "STRAIGHT_JOIN": TokenType.STRAIGHT_JOIN,
 819        "TABLE": TokenType.TABLE,
 820        "TABLESAMPLE": TokenType.TABLE_SAMPLE,
 821        "TEMP": TokenType.TEMPORARY,
 822        "TEMPORARY": TokenType.TEMPORARY,
 823        "THEN": TokenType.THEN,
 824        "TRUE": TokenType.TRUE,
 825        "TRUNCATE": TokenType.TRUNCATE,
 826        "UNION": TokenType.UNION,
 827        "UNKNOWN": TokenType.UNKNOWN,
 828        "UNNEST": TokenType.UNNEST,
 829        "UNPIVOT": TokenType.UNPIVOT,
 830        "UPDATE": TokenType.UPDATE,
 831        "USE": TokenType.USE,
 832        "USING": TokenType.USING,
 833        "UUID": TokenType.UUID,
 834        "VALUES": TokenType.VALUES,
 835        "VIEW": TokenType.VIEW,
 836        "VOLATILE": TokenType.VOLATILE,
 837        "WHEN": TokenType.WHEN,
 838        "WHERE": TokenType.WHERE,
 839        "WINDOW": TokenType.WINDOW,
 840        "WITH": TokenType.WITH,
 841        "APPLY": TokenType.APPLY,
 842        "ARRAY": TokenType.ARRAY,
 843        "BIT": TokenType.BIT,
 844        "BOOL": TokenType.BOOLEAN,
 845        "BOOLEAN": TokenType.BOOLEAN,
 846        "BYTE": TokenType.TINYINT,
 847        "MEDIUMINT": TokenType.MEDIUMINT,
 848        "INT1": TokenType.TINYINT,
 849        "TINYINT": TokenType.TINYINT,
 850        "INT16": TokenType.SMALLINT,
 851        "SHORT": TokenType.SMALLINT,
 852        "SMALLINT": TokenType.SMALLINT,
 853        "INT128": TokenType.INT128,
 854        "HUGEINT": TokenType.INT128,
 855        "UHUGEINT": TokenType.UINT128,
 856        "INT2": TokenType.SMALLINT,
 857        "INTEGER": TokenType.INT,
 858        "INT": TokenType.INT,
 859        "INT4": TokenType.INT,
 860        "INT32": TokenType.INT,
 861        "INT64": TokenType.BIGINT,
 862        "LONG": TokenType.BIGINT,
 863        "BIGINT": TokenType.BIGINT,
 864        "INT8": TokenType.TINYINT,
 865        "UINT": TokenType.UINT,
 866        "DEC": TokenType.DECIMAL,
 867        "DECIMAL": TokenType.DECIMAL,
 868        "DECIMAL32": TokenType.DECIMAL32,
 869        "DECIMAL64": TokenType.DECIMAL64,
 870        "DECIMAL128": TokenType.DECIMAL128,
 871        "DECIMAL256": TokenType.DECIMAL256,
 872        "BIGDECIMAL": TokenType.BIGDECIMAL,
 873        "BIGNUMERIC": TokenType.BIGDECIMAL,
 874        "LIST": TokenType.LIST,
 875        "MAP": TokenType.MAP,
 876        "NULLABLE": TokenType.NULLABLE,
 877        "NUMBER": TokenType.DECIMAL,
 878        "NUMERIC": TokenType.DECIMAL,
 879        "FIXED": TokenType.DECIMAL,
 880        "REAL": TokenType.FLOAT,
 881        "FLOAT": TokenType.FLOAT,
 882        "FLOAT4": TokenType.FLOAT,
 883        "FLOAT8": TokenType.DOUBLE,
 884        "DOUBLE": TokenType.DOUBLE,
 885        "DOUBLE PRECISION": TokenType.DOUBLE,
 886        "JSON": TokenType.JSON,
 887        "JSONB": TokenType.JSONB,
 888        "CHAR": TokenType.CHAR,
 889        "CHARACTER": TokenType.CHAR,
 890        "NCHAR": TokenType.NCHAR,
 891        "VARCHAR": TokenType.VARCHAR,
 892        "VARCHAR2": TokenType.VARCHAR,
 893        "NVARCHAR": TokenType.NVARCHAR,
 894        "NVARCHAR2": TokenType.NVARCHAR,
 895        "BPCHAR": TokenType.BPCHAR,
 896        "STR": TokenType.TEXT,
 897        "STRING": TokenType.TEXT,
 898        "TEXT": TokenType.TEXT,
 899        "LONGTEXT": TokenType.LONGTEXT,
 900        "MEDIUMTEXT": TokenType.MEDIUMTEXT,
 901        "TINYTEXT": TokenType.TINYTEXT,
 902        "CLOB": TokenType.TEXT,
 903        "LONGVARCHAR": TokenType.TEXT,
 904        "BINARY": TokenType.BINARY,
 905        "BLOB": TokenType.VARBINARY,
 906        "LONGBLOB": TokenType.LONGBLOB,
 907        "MEDIUMBLOB": TokenType.MEDIUMBLOB,
 908        "TINYBLOB": TokenType.TINYBLOB,
 909        "BYTEA": TokenType.VARBINARY,
 910        "VARBINARY": TokenType.VARBINARY,
 911        "TIME": TokenType.TIME,
 912        "TIMETZ": TokenType.TIMETZ,
 913        "TIMESTAMP": TokenType.TIMESTAMP,
 914        "TIMESTAMPTZ": TokenType.TIMESTAMPTZ,
 915        "TIMESTAMPLTZ": TokenType.TIMESTAMPLTZ,
 916        "TIMESTAMP_LTZ": TokenType.TIMESTAMPLTZ,
 917        "TIMESTAMPNTZ": TokenType.TIMESTAMPNTZ,
 918        "TIMESTAMP_NTZ": TokenType.TIMESTAMPNTZ,
 919        "DATE": TokenType.DATE,
 920        "DATETIME": TokenType.DATETIME,
 921        "INT4RANGE": TokenType.INT4RANGE,
 922        "INT4MULTIRANGE": TokenType.INT4MULTIRANGE,
 923        "INT8RANGE": TokenType.INT8RANGE,
 924        "INT8MULTIRANGE": TokenType.INT8MULTIRANGE,
 925        "NUMRANGE": TokenType.NUMRANGE,
 926        "NUMMULTIRANGE": TokenType.NUMMULTIRANGE,
 927        "TSRANGE": TokenType.TSRANGE,
 928        "TSMULTIRANGE": TokenType.TSMULTIRANGE,
 929        "TSTZRANGE": TokenType.TSTZRANGE,
 930        "TSTZMULTIRANGE": TokenType.TSTZMULTIRANGE,
 931        "DATERANGE": TokenType.DATERANGE,
 932        "DATEMULTIRANGE": TokenType.DATEMULTIRANGE,
 933        "UNIQUE": TokenType.UNIQUE,
 934        "VECTOR": TokenType.VECTOR,
 935        "STRUCT": TokenType.STRUCT,
 936        "SEQUENCE": TokenType.SEQUENCE,
 937        "VARIANT": TokenType.VARIANT,
 938        "ALTER": TokenType.ALTER,
 939        "ANALYZE": TokenType.COMMAND,
 940        "CALL": TokenType.COMMAND,
 941        "COMMENT": TokenType.COMMENT,
 942        "EXPLAIN": TokenType.COMMAND,
 943        "GRANT": TokenType.GRANT,
 944        "OPTIMIZE": TokenType.COMMAND,
 945        "PREPARE": TokenType.COMMAND,
 946        "VACUUM": TokenType.COMMAND,
 947        "USER-DEFINED": TokenType.USERDEFINED,
 948        "FOR VERSION": TokenType.VERSION_SNAPSHOT,
 949        "FOR TIMESTAMP": TokenType.TIMESTAMP_SNAPSHOT,
 950    }
 951
 952    WHITE_SPACE: t.Dict[t.Optional[str], TokenType] = {
 953        " ": TokenType.SPACE,
 954        "\t": TokenType.SPACE,
 955        "\n": TokenType.BREAK,
 956        "\r": TokenType.BREAK,
 957    }
 958
 959    COMMANDS = {
 960        TokenType.COMMAND,
 961        TokenType.EXECUTE,
 962        TokenType.FETCH,
 963        TokenType.SHOW,
 964        TokenType.RENAME,
 965    }
 966
 967    COMMAND_PREFIX_TOKENS = {TokenType.SEMICOLON, TokenType.BEGIN}
 968
 969    # Handle numeric literals like in hive (3L = BIGINT)
 970    NUMERIC_LITERALS: t.Dict[str, str] = {}
 971
 972    COMMENTS = ["--", ("/*", "*/")]
 973
 974    __slots__ = (
 975        "sql",
 976        "size",
 977        "tokens",
 978        "dialect",
 979        "_start",
 980        "_current",
 981        "_line",
 982        "_col",
 983        "_comments",
 984        "_char",
 985        "_end",
 986        "_peek",
 987        "_prev_token_line",
 988        "_rs_dialect_settings",
 989    )
 990
 991    def __init__(self, dialect: DialectType = None) -> None:
 992        from sqlglot.dialects import Dialect
 993
 994        self.dialect = Dialect.get_or_raise(dialect)
 995
 996        if USE_RS_TOKENIZER:
 997            self._rs_dialect_settings = RsTokenizerDialectSettings(
 998                unescaped_sequences=self.dialect.UNESCAPED_SEQUENCES,
 999                identifiers_can_start_with_digit=self.dialect.IDENTIFIERS_CAN_START_WITH_DIGIT,
1000            )
1001
1002        self.reset()
1003
1004    def reset(self) -> None:
1005        self.sql = ""
1006        self.size = 0
1007        self.tokens: t.List[Token] = []
1008        self._start = 0
1009        self._current = 0
1010        self._line = 1
1011        self._col = 0
1012        self._comments: t.List[str] = []
1013
1014        self._char = ""
1015        self._end = False
1016        self._peek = ""
1017        self._prev_token_line = -1
1018
1019    def tokenize(self, sql: str) -> t.List[Token]:
1020        """Returns a list of tokens corresponding to the SQL string `sql`."""
1021        if USE_RS_TOKENIZER:
1022            return self.tokenize_rs(sql)
1023
1024        self.reset()
1025        self.sql = sql
1026        self.size = len(sql)
1027
1028        try:
1029            self._scan()
1030        except Exception as e:
1031            start = max(self._current - 50, 0)
1032            end = min(self._current + 50, self.size - 1)
1033            context = self.sql[start:end]
1034            raise TokenError(f"Error tokenizing '{context}'") from e
1035
1036        return self.tokens
1037
1038    def _scan(self, until: t.Optional[t.Callable] = None) -> None:
1039        while self.size and not self._end:
1040            current = self._current
1041
1042            # Skip spaces here rather than iteratively calling advance() for performance reasons
1043            while current < self.size:
1044                char = self.sql[current]
1045
1046                if char.isspace() and (char == " " or char == "\t"):
1047                    current += 1
1048                else:
1049                    break
1050
1051            offset = current - self._current if current > self._current else 1
1052
1053            self._start = current
1054            self._advance(offset)
1055
1056            if not self._char.isspace():
1057                if self._char.isdigit():
1058                    self._scan_number()
1059                elif self._char in self._IDENTIFIERS:
1060                    self._scan_identifier(self._IDENTIFIERS[self._char])
1061                else:
1062                    self._scan_keywords()
1063
1064            if until and until():
1065                break
1066
1067        if self.tokens and self._comments:
1068            self.tokens[-1].comments.extend(self._comments)
1069
1070    def _chars(self, size: int) -> str:
1071        if size == 1:
1072            return self._char
1073
1074        start = self._current - 1
1075        end = start + size
1076
1077        return self.sql[start:end] if end <= self.size else ""
1078
1079    def _advance(self, i: int = 1, alnum: bool = False) -> None:
1080        if self.WHITE_SPACE.get(self._char) is TokenType.BREAK:
1081            # Ensures we don't count an extra line if we get a \r\n line break sequence
1082            if not (self._char == "\r" and self._peek == "\n"):
1083                self._col = 1
1084                self._line += 1
1085        else:
1086            self._col += i
1087
1088        self._current += i
1089        self._end = self._current >= self.size
1090        self._char = self.sql[self._current - 1]
1091        self._peek = "" if self._end else self.sql[self._current]
1092
1093        if alnum and self._char.isalnum():
1094            # Here we use local variables instead of attributes for better performance
1095            _col = self._col
1096            _current = self._current
1097            _end = self._end
1098            _peek = self._peek
1099
1100            while _peek.isalnum():
1101                _col += 1
1102                _current += 1
1103                _end = _current >= self.size
1104                _peek = "" if _end else self.sql[_current]
1105
1106            self._col = _col
1107            self._current = _current
1108            self._end = _end
1109            self._peek = _peek
1110            self._char = self.sql[_current - 1]
1111
1112    @property
1113    def _text(self) -> str:
1114        return self.sql[self._start : self._current]
1115
1116    def _add(self, token_type: TokenType, text: t.Optional[str] = None) -> None:
1117        self._prev_token_line = self._line
1118
1119        if self._comments and token_type == TokenType.SEMICOLON and self.tokens:
1120            self.tokens[-1].comments.extend(self._comments)
1121            self._comments = []
1122
1123        self.tokens.append(
1124            Token(
1125                token_type,
1126                text=self._text if text is None else text,
1127                line=self._line,
1128                col=self._col,
1129                start=self._start,
1130                end=self._current - 1,
1131                comments=self._comments,
1132            )
1133        )
1134        self._comments = []
1135
1136        # If we have either a semicolon or a begin token before the command's token, we'll parse
1137        # whatever follows the command's token as a string
1138        if (
1139            token_type in self.COMMANDS
1140            and self._peek != ";"
1141            and (len(self.tokens) == 1 or self.tokens[-2].token_type in self.COMMAND_PREFIX_TOKENS)
1142        ):
1143            start = self._current
1144            tokens = len(self.tokens)
1145            self._scan(lambda: self._peek == ";")
1146            self.tokens = self.tokens[:tokens]
1147            text = self.sql[start : self._current].strip()
1148            if text:
1149                self._add(TokenType.STRING, text)
1150
1151    def _scan_keywords(self) -> None:
1152        size = 0
1153        word = None
1154        chars = self._text
1155        char = chars
1156        prev_space = False
1157        skip = False
1158        trie = self._KEYWORD_TRIE
1159        single_token = char in self.SINGLE_TOKENS
1160
1161        while chars:
1162            if skip:
1163                result = TrieResult.PREFIX
1164            else:
1165                result, trie = in_trie(trie, char.upper())
1166
1167            if result == TrieResult.FAILED:
1168                break
1169            if result == TrieResult.EXISTS:
1170                word = chars
1171
1172            end = self._current + size
1173            size += 1
1174
1175            if end < self.size:
1176                char = self.sql[end]
1177                single_token = single_token or char in self.SINGLE_TOKENS
1178                is_space = char.isspace()
1179
1180                if not is_space or not prev_space:
1181                    if is_space:
1182                        char = " "
1183                    chars += char
1184                    prev_space = is_space
1185                    skip = False
1186                else:
1187                    skip = True
1188            else:
1189                char = ""
1190                break
1191
1192        if word:
1193            if self._scan_string(word):
1194                return
1195            if self._scan_comment(word):
1196                return
1197            if prev_space or single_token or not char:
1198                self._advance(size - 1)
1199                word = word.upper()
1200                self._add(self.KEYWORDS[word], text=word)
1201                return
1202
1203        if self._char in self.SINGLE_TOKENS:
1204            self._add(self.SINGLE_TOKENS[self._char], text=self._char)
1205            return
1206
1207        self._scan_var()
1208
1209    def _scan_comment(self, comment_start: str) -> bool:
1210        if comment_start not in self._COMMENTS:
1211            return False
1212
1213        comment_start_line = self._line
1214        comment_start_size = len(comment_start)
1215        comment_end = self._COMMENTS[comment_start]
1216
1217        if comment_end:
1218            # Skip the comment's start delimiter
1219            self._advance(comment_start_size)
1220
1221            comment_count = 1
1222            comment_end_size = len(comment_end)
1223
1224            while not self._end:
1225                if self._chars(comment_end_size) == comment_end:
1226                    comment_count -= 1
1227                    if not comment_count:
1228                        break
1229
1230                self._advance(alnum=True)
1231
1232                # Nested comments are allowed by some dialects, e.g. databricks, duckdb, postgres
1233                if (
1234                    self.NESTED_COMMENTS
1235                    and not self._end
1236                    and self._chars(comment_end_size) == comment_start
1237                ):
1238                    self._advance(comment_start_size)
1239                    comment_count += 1
1240
1241            self._comments.append(self._text[comment_start_size : -comment_end_size + 1])
1242            self._advance(comment_end_size - 1)
1243        else:
1244            while not self._end and self.WHITE_SPACE.get(self._peek) is not TokenType.BREAK:
1245                self._advance(alnum=True)
1246            self._comments.append(self._text[comment_start_size:])
1247
1248        if (
1249            comment_start == self.HINT_START
1250            and self.tokens
1251            and self.tokens[-1].token_type in self.TOKENS_PRECEDING_HINT
1252        ):
1253            self._add(TokenType.HINT)
1254
1255        # Leading comment is attached to the succeeding token, whilst trailing comment to the preceding.
1256        # Multiple consecutive comments are preserved by appending them to the current comments list.
1257        if comment_start_line == self._prev_token_line:
1258            self.tokens[-1].comments.extend(self._comments)
1259            self._comments = []
1260            self._prev_token_line = self._line
1261
1262        return True
1263
1264    def _scan_number(self) -> None:
1265        if self._char == "0":
1266            peek = self._peek.upper()
1267            if peek == "B":
1268                return self._scan_bits() if self.BIT_STRINGS else self._add(TokenType.NUMBER)
1269            elif peek == "X":
1270                return self._scan_hex() if self.HEX_STRINGS else self._add(TokenType.NUMBER)
1271
1272        decimal = False
1273        scientific = 0
1274
1275        while True:
1276            if self._peek.isdigit():
1277                self._advance()
1278            elif self._peek == "." and not decimal:
1279                if self.tokens and self.tokens[-1].token_type == TokenType.PARAMETER:
1280                    return self._add(TokenType.NUMBER)
1281                decimal = True
1282                self._advance()
1283            elif self._peek in ("-", "+") and scientific == 1:
1284                scientific += 1
1285                self._advance()
1286            elif self._peek.upper() == "E" and not scientific:
1287                scientific += 1
1288                self._advance()
1289            elif self._peek.isidentifier():
1290                number_text = self._text
1291                literal = ""
1292
1293                while self._peek.strip() and self._peek not in self.SINGLE_TOKENS:
1294                    literal += self._peek
1295                    self._advance()
1296
1297                token_type = self.KEYWORDS.get(self.NUMERIC_LITERALS.get(literal.upper(), ""))
1298
1299                if token_type:
1300                    self._add(TokenType.NUMBER, number_text)
1301                    self._add(TokenType.DCOLON, "::")
1302                    return self._add(token_type, literal)
1303                elif self.dialect.IDENTIFIERS_CAN_START_WITH_DIGIT:
1304                    return self._add(TokenType.VAR)
1305
1306                self._advance(-len(literal))
1307                return self._add(TokenType.NUMBER, number_text)
1308            else:
1309                return self._add(TokenType.NUMBER)
1310
1311    def _scan_bits(self) -> None:
1312        self._advance()
1313        value = self._extract_value()
1314        try:
1315            # If `value` can't be converted to a binary, fallback to tokenizing it as an identifier
1316            int(value, 2)
1317            self._add(TokenType.BIT_STRING, value[2:])  # Drop the 0b
1318        except ValueError:
1319            self._add(TokenType.IDENTIFIER)
1320
1321    def _scan_hex(self) -> None:
1322        self._advance()
1323        value = self._extract_value()
1324        try:
1325            # If `value` can't be converted to a hex, fallback to tokenizing it as an identifier
1326            int(value, 16)
1327            self._add(TokenType.HEX_STRING, value[2:])  # Drop the 0x
1328        except ValueError:
1329            self._add(TokenType.IDENTIFIER)
1330
1331    def _extract_value(self) -> str:
1332        while True:
1333            char = self._peek.strip()
1334            if char and char not in self.SINGLE_TOKENS:
1335                self._advance(alnum=True)
1336            else:
1337                break
1338
1339        return self._text
1340
1341    def _scan_string(self, start: str) -> bool:
1342        base = None
1343        token_type = TokenType.STRING
1344
1345        if start in self._QUOTES:
1346            end = self._QUOTES[start]
1347        elif start in self._FORMAT_STRINGS:
1348            end, token_type = self._FORMAT_STRINGS[start]
1349
1350            if token_type == TokenType.HEX_STRING:
1351                base = 16
1352            elif token_type == TokenType.BIT_STRING:
1353                base = 2
1354            elif token_type == TokenType.HEREDOC_STRING:
1355                self._advance()
1356
1357                if self._char == end:
1358                    tag = ""
1359                else:
1360                    tag = self._extract_string(
1361                        end,
1362                        raw_string=True,
1363                        raise_unmatched=not self.HEREDOC_TAG_IS_IDENTIFIER,
1364                    )
1365
1366                if tag and self.HEREDOC_TAG_IS_IDENTIFIER and (self._end or not tag.isidentifier()):
1367                    if not self._end:
1368                        self._advance(-1)
1369
1370                    self._advance(-len(tag))
1371                    self._add(self.HEREDOC_STRING_ALTERNATIVE)
1372                    return True
1373
1374                end = f"{start}{tag}{end}"
1375        else:
1376            return False
1377
1378        self._advance(len(start))
1379        text = self._extract_string(end, raw_string=token_type == TokenType.RAW_STRING)
1380
1381        if base:
1382            try:
1383                int(text, base)
1384            except Exception:
1385                raise TokenError(
1386                    f"Numeric string contains invalid characters from {self._line}:{self._start}"
1387                )
1388
1389        self._add(token_type, text)
1390        return True
1391
1392    def _scan_identifier(self, identifier_end: str) -> None:
1393        self._advance()
1394        text = self._extract_string(
1395            identifier_end, escapes=self._IDENTIFIER_ESCAPES | {identifier_end}
1396        )
1397        self._add(TokenType.IDENTIFIER, text)
1398
1399    def _scan_var(self) -> None:
1400        while True:
1401            char = self._peek.strip()
1402            if char and (char in self.VAR_SINGLE_TOKENS or char not in self.SINGLE_TOKENS):
1403                self._advance(alnum=True)
1404            else:
1405                break
1406
1407        self._add(
1408            TokenType.VAR
1409            if self.tokens and self.tokens[-1].token_type == TokenType.PARAMETER
1410            else self.KEYWORDS.get(self._text.upper(), TokenType.VAR)
1411        )
1412
1413    def _extract_string(
1414        self,
1415        delimiter: str,
1416        escapes: t.Optional[t.Set[str]] = None,
1417        raw_string: bool = False,
1418        raise_unmatched: bool = True,
1419    ) -> str:
1420        text = ""
1421        delim_size = len(delimiter)
1422        escapes = self._STRING_ESCAPES if escapes is None else escapes
1423
1424        while True:
1425            if (
1426                not raw_string
1427                and self.dialect.UNESCAPED_SEQUENCES
1428                and self._peek
1429                and self._char in self.STRING_ESCAPES
1430            ):
1431                unescaped_sequence = self.dialect.UNESCAPED_SEQUENCES.get(self._char + self._peek)
1432                if unescaped_sequence:
1433                    self._advance(2)
1434                    text += unescaped_sequence
1435                    continue
1436            if (
1437                (self.STRING_ESCAPES_ALLOWED_IN_RAW_STRINGS or not raw_string)
1438                and self._char in escapes
1439                and (self._peek == delimiter or self._peek in escapes)
1440                and (self._char not in self._QUOTES or self._char == self._peek)
1441            ):
1442                if self._peek == delimiter:
1443                    text += self._peek
1444                else:
1445                    text += self._char + self._peek
1446
1447                if self._current + 1 < self.size:
1448                    self._advance(2)
1449                else:
1450                    raise TokenError(f"Missing {delimiter} from {self._line}:{self._current}")
1451            else:
1452                if self._chars(delim_size) == delimiter:
1453                    if delim_size > 1:
1454                        self._advance(delim_size - 1)
1455                    break
1456
1457                if self._end:
1458                    if not raise_unmatched:
1459                        return text + self._char
1460
1461                    raise TokenError(f"Missing {delimiter} from {self._line}:{self._start}")
1462
1463                current = self._current - 1
1464                self._advance(alnum=True)
1465                text += self.sql[current : self._current - 1]
1466
1467        return text
1468
1469    def tokenize_rs(self, sql: str) -> t.List[Token]:
1470        if not self._RS_TOKENIZER:
1471            raise SqlglotError("Rust tokenizer is not available")
1472
1473        try:
1474            tokens = self._RS_TOKENIZER.tokenize(sql, self._rs_dialect_settings)
1475            for token in tokens:
1476                token.token_type = _ALL_TOKEN_TYPES[token.token_type_index]
1477            return tokens
1478        except Exception as e:
1479            raise TokenError(str(e))
class TokenType(sqlglot.helper.AutoName):
 29class TokenType(AutoName):
 30    L_PAREN = auto()
 31    R_PAREN = auto()
 32    L_BRACKET = auto()
 33    R_BRACKET = auto()
 34    L_BRACE = auto()
 35    R_BRACE = auto()
 36    COMMA = auto()
 37    DOT = auto()
 38    DASH = auto()
 39    PLUS = auto()
 40    COLON = auto()
 41    DCOLON = auto()
 42    DQMARK = auto()
 43    SEMICOLON = auto()
 44    STAR = auto()
 45    BACKSLASH = auto()
 46    SLASH = auto()
 47    LT = auto()
 48    LTE = auto()
 49    GT = auto()
 50    GTE = auto()
 51    NOT = auto()
 52    EQ = auto()
 53    NEQ = auto()
 54    NULLSAFE_EQ = auto()
 55    COLON_EQ = auto()
 56    AND = auto()
 57    OR = auto()
 58    AMP = auto()
 59    DPIPE = auto()
 60    PIPE = auto()
 61    PIPE_SLASH = auto()
 62    DPIPE_SLASH = auto()
 63    CARET = auto()
 64    CARET_AT = auto()
 65    TILDA = auto()
 66    ARROW = auto()
 67    DARROW = auto()
 68    FARROW = auto()
 69    HASH = auto()
 70    HASH_ARROW = auto()
 71    DHASH_ARROW = auto()
 72    LR_ARROW = auto()
 73    DAT = auto()
 74    LT_AT = auto()
 75    AT_GT = auto()
 76    DOLLAR = auto()
 77    PARAMETER = auto()
 78    SESSION_PARAMETER = auto()
 79    DAMP = auto()
 80    XOR = auto()
 81    DSTAR = auto()
 82
 83    BLOCK_START = auto()
 84    BLOCK_END = auto()
 85
 86    SPACE = auto()
 87    BREAK = auto()
 88
 89    STRING = auto()
 90    NUMBER = auto()
 91    IDENTIFIER = auto()
 92    DATABASE = auto()
 93    COLUMN = auto()
 94    COLUMN_DEF = auto()
 95    SCHEMA = auto()
 96    TABLE = auto()
 97    WAREHOUSE = auto()
 98    STREAMLIT = auto()
 99    VAR = auto()
100    BIT_STRING = auto()
101    HEX_STRING = auto()
102    BYTE_STRING = auto()
103    NATIONAL_STRING = auto()
104    RAW_STRING = auto()
105    HEREDOC_STRING = auto()
106    UNICODE_STRING = auto()
107
108    # types
109    BIT = auto()
110    BOOLEAN = auto()
111    TINYINT = auto()
112    UTINYINT = auto()
113    SMALLINT = auto()
114    USMALLINT = auto()
115    MEDIUMINT = auto()
116    UMEDIUMINT = auto()
117    INT = auto()
118    UINT = auto()
119    BIGINT = auto()
120    UBIGINT = auto()
121    INT128 = auto()
122    UINT128 = auto()
123    INT256 = auto()
124    UINT256 = auto()
125    FLOAT = auto()
126    DOUBLE = auto()
127    DECIMAL = auto()
128    DECIMAL32 = auto()
129    DECIMAL64 = auto()
130    DECIMAL128 = auto()
131    DECIMAL256 = auto()
132    UDECIMAL = auto()
133    BIGDECIMAL = auto()
134    CHAR = auto()
135    NCHAR = auto()
136    VARCHAR = auto()
137    NVARCHAR = auto()
138    BPCHAR = auto()
139    TEXT = auto()
140    MEDIUMTEXT = auto()
141    LONGTEXT = auto()
142    MEDIUMBLOB = auto()
143    LONGBLOB = auto()
144    TINYBLOB = auto()
145    TINYTEXT = auto()
146    NAME = auto()
147    BINARY = auto()
148    VARBINARY = auto()
149    JSON = auto()
150    JSONB = auto()
151    TIME = auto()
152    TIMETZ = auto()
153    TIMESTAMP = auto()
154    TIMESTAMPTZ = auto()
155    TIMESTAMPLTZ = auto()
156    TIMESTAMPNTZ = auto()
157    TIMESTAMP_S = auto()
158    TIMESTAMP_MS = auto()
159    TIMESTAMP_NS = auto()
160    DATETIME = auto()
161    DATETIME2 = auto()
162    DATETIME64 = auto()
163    SMALLDATETIME = auto()
164    DATE = auto()
165    DATE32 = auto()
166    INT4RANGE = auto()
167    INT4MULTIRANGE = auto()
168    INT8RANGE = auto()
169    INT8MULTIRANGE = auto()
170    NUMRANGE = auto()
171    NUMMULTIRANGE = auto()
172    TSRANGE = auto()
173    TSMULTIRANGE = auto()
174    TSTZRANGE = auto()
175    TSTZMULTIRANGE = auto()
176    DATERANGE = auto()
177    DATEMULTIRANGE = auto()
178    UUID = auto()
179    GEOGRAPHY = auto()
180    NULLABLE = auto()
181    GEOMETRY = auto()
182    POINT = auto()
183    RING = auto()
184    LINESTRING = auto()
185    MULTILINESTRING = auto()
186    POLYGON = auto()
187    MULTIPOLYGON = auto()
188    HLLSKETCH = auto()
189    HSTORE = auto()
190    SUPER = auto()
191    SERIAL = auto()
192    SMALLSERIAL = auto()
193    BIGSERIAL = auto()
194    XML = auto()
195    YEAR = auto()
196    UNIQUEIDENTIFIER = auto()
197    USERDEFINED = auto()
198    MONEY = auto()
199    SMALLMONEY = auto()
200    ROWVERSION = auto()
201    IMAGE = auto()
202    VARIANT = auto()
203    OBJECT = auto()
204    INET = auto()
205    IPADDRESS = auto()
206    IPPREFIX = auto()
207    IPV4 = auto()
208    IPV6 = auto()
209    ENUM = auto()
210    ENUM8 = auto()
211    ENUM16 = auto()
212    FIXEDSTRING = auto()
213    LOWCARDINALITY = auto()
214    NESTED = auto()
215    AGGREGATEFUNCTION = auto()
216    SIMPLEAGGREGATEFUNCTION = auto()
217    TDIGEST = auto()
218    UNKNOWN = auto()
219    VECTOR = auto()
220
221    # keywords
222    ALIAS = auto()
223    ALTER = auto()
224    ALWAYS = auto()
225    ALL = auto()
226    ANTI = auto()
227    ANY = auto()
228    APPLY = auto()
229    ARRAY = auto()
230    ASC = auto()
231    ASOF = auto()
232    ATTACH = auto()
233    AUTO_INCREMENT = auto()
234    BEGIN = auto()
235    BETWEEN = auto()
236    BULK_COLLECT_INTO = auto()
237    CACHE = auto()
238    CASE = auto()
239    CHARACTER_SET = auto()
240    CLUSTER_BY = auto()
241    COLLATE = auto()
242    COMMAND = auto()
243    COMMENT = auto()
244    COMMIT = auto()
245    CONNECT_BY = auto()
246    CONSTRAINT = auto()
247    COPY = auto()
248    CREATE = auto()
249    CROSS = auto()
250    CUBE = auto()
251    CURRENT_DATE = auto()
252    CURRENT_DATETIME = auto()
253    CURRENT_TIME = auto()
254    CURRENT_TIMESTAMP = auto()
255    CURRENT_USER = auto()
256    DECLARE = auto()
257    DEFAULT = auto()
258    DELETE = auto()
259    DESC = auto()
260    DESCRIBE = auto()
261    DETACH = auto()
262    DICTIONARY = auto()
263    DISTINCT = auto()
264    DISTRIBUTE_BY = auto()
265    DIV = auto()
266    DROP = auto()
267    ELSE = auto()
268    END = auto()
269    ESCAPE = auto()
270    EXCEPT = auto()
271    EXECUTE = auto()
272    EXISTS = auto()
273    FALSE = auto()
274    FETCH = auto()
275    FILTER = auto()
276    FINAL = auto()
277    FIRST = auto()
278    FOR = auto()
279    FORCE = auto()
280    FOREIGN_KEY = auto()
281    FORMAT = auto()
282    FROM = auto()
283    FULL = auto()
284    FUNCTION = auto()
285    GLOB = auto()
286    GLOBAL = auto()
287    GRANT = auto()
288    GROUP_BY = auto()
289    GROUPING_SETS = auto()
290    HAVING = auto()
291    HINT = auto()
292    IGNORE = auto()
293    ILIKE = auto()
294    ILIKE_ANY = auto()
295    IN = auto()
296    INDEX = auto()
297    INNER = auto()
298    INSERT = auto()
299    INTERSECT = auto()
300    INTERVAL = auto()
301    INTO = auto()
302    INTRODUCER = auto()
303    IRLIKE = auto()
304    IS = auto()
305    ISNULL = auto()
306    JOIN = auto()
307    JOIN_MARKER = auto()
308    KEEP = auto()
309    KEY = auto()
310    KILL = auto()
311    LANGUAGE = auto()
312    LATERAL = auto()
313    LEFT = auto()
314    LIKE = auto()
315    LIKE_ANY = auto()
316    LIMIT = auto()
317    LIST = auto()
318    LOAD = auto()
319    LOCK = auto()
320    MAP = auto()
321    MATCH_CONDITION = auto()
322    MATCH_RECOGNIZE = auto()
323    MEMBER_OF = auto()
324    MERGE = auto()
325    MOD = auto()
326    MODEL = auto()
327    NATURAL = auto()
328    NEXT = auto()
329    NOTNULL = auto()
330    NULL = auto()
331    OBJECT_IDENTIFIER = auto()
332    OFFSET = auto()
333    ON = auto()
334    ONLY = auto()
335    OPERATOR = auto()
336    ORDER_BY = auto()
337    ORDER_SIBLINGS_BY = auto()
338    ORDERED = auto()
339    ORDINALITY = auto()
340    OUTER = auto()
341    OVER = auto()
342    OVERLAPS = auto()
343    OVERWRITE = auto()
344    PARTITION = auto()
345    PARTITION_BY = auto()
346    PERCENT = auto()
347    PIVOT = auto()
348    PLACEHOLDER = auto()
349    POSITIONAL = auto()
350    PRAGMA = auto()
351    PREWHERE = auto()
352    PRIMARY_KEY = auto()
353    PROCEDURE = auto()
354    PROPERTIES = auto()
355    PSEUDO_TYPE = auto()
356    QUALIFY = auto()
357    QUOTE = auto()
358    RANGE = auto()
359    RECURSIVE = auto()
360    REFRESH = auto()
361    RENAME = auto()
362    REPLACE = auto()
363    RETURNING = auto()
364    REFERENCES = auto()
365    RIGHT = auto()
366    RLIKE = auto()
367    ROLLBACK = auto()
368    ROLLUP = auto()
369    ROW = auto()
370    ROWS = auto()
371    SELECT = auto()
372    SEMI = auto()
373    SEPARATOR = auto()
374    SEQUENCE = auto()
375    SERDE_PROPERTIES = auto()
376    SET = auto()
377    SETTINGS = auto()
378    SHOW = auto()
379    SIMILAR_TO = auto()
380    SOME = auto()
381    SORT_BY = auto()
382    START_WITH = auto()
383    STORAGE_INTEGRATION = auto()
384    STRAIGHT_JOIN = auto()
385    STRUCT = auto()
386    SUMMARIZE = auto()
387    TABLE_SAMPLE = auto()
388    TAG = auto()
389    TEMPORARY = auto()
390    TOP = auto()
391    THEN = auto()
392    TRUE = auto()
393    TRUNCATE = auto()
394    UNCACHE = auto()
395    UNION = auto()
396    UNNEST = auto()
397    UNPIVOT = auto()
398    UPDATE = auto()
399    USE = auto()
400    USING = auto()
401    VALUES = auto()
402    VIEW = auto()
403    VOLATILE = auto()
404    WHEN = auto()
405    WHERE = auto()
406    WINDOW = auto()
407    WITH = auto()
408    UNIQUE = auto()
409    VERSION_SNAPSHOT = auto()
410    TIMESTAMP_SNAPSHOT = auto()
411    OPTION = auto()
412    SINK = auto()
413    SOURCE = auto()

An enumeration.

L_PAREN = <TokenType.L_PAREN: 'L_PAREN'>
R_PAREN = <TokenType.R_PAREN: 'R_PAREN'>
L_BRACKET = <TokenType.L_BRACKET: 'L_BRACKET'>
R_BRACKET = <TokenType.R_BRACKET: 'R_BRACKET'>
L_BRACE = <TokenType.L_BRACE: 'L_BRACE'>
R_BRACE = <TokenType.R_BRACE: 'R_BRACE'>
COMMA = <TokenType.COMMA: 'COMMA'>
DOT = <TokenType.DOT: 'DOT'>
DASH = <TokenType.DASH: 'DASH'>
PLUS = <TokenType.PLUS: 'PLUS'>
COLON = <TokenType.COLON: 'COLON'>
DCOLON = <TokenType.DCOLON: 'DCOLON'>
DQMARK = <TokenType.DQMARK: 'DQMARK'>
SEMICOLON = <TokenType.SEMICOLON: 'SEMICOLON'>
STAR = <TokenType.STAR: 'STAR'>
BACKSLASH = <TokenType.BACKSLASH: 'BACKSLASH'>
SLASH = <TokenType.SLASH: 'SLASH'>
LT = <TokenType.LT: 'LT'>
LTE = <TokenType.LTE: 'LTE'>
GT = <TokenType.GT: 'GT'>
GTE = <TokenType.GTE: 'GTE'>
NOT = <TokenType.NOT: 'NOT'>
EQ = <TokenType.EQ: 'EQ'>
NEQ = <TokenType.NEQ: 'NEQ'>
NULLSAFE_EQ = <TokenType.NULLSAFE_EQ: 'NULLSAFE_EQ'>
COLON_EQ = <TokenType.COLON_EQ: 'COLON_EQ'>
AND = <TokenType.AND: 'AND'>
OR = <TokenType.OR: 'OR'>
AMP = <TokenType.AMP: 'AMP'>
DPIPE = <TokenType.DPIPE: 'DPIPE'>
PIPE = <TokenType.PIPE: 'PIPE'>
PIPE_SLASH = <TokenType.PIPE_SLASH: 'PIPE_SLASH'>
DPIPE_SLASH = <TokenType.DPIPE_SLASH: 'DPIPE_SLASH'>
CARET = <TokenType.CARET: 'CARET'>
CARET_AT = <TokenType.CARET_AT: 'CARET_AT'>
TILDA = <TokenType.TILDA: 'TILDA'>
ARROW = <TokenType.ARROW: 'ARROW'>
DARROW = <TokenType.DARROW: 'DARROW'>
FARROW = <TokenType.FARROW: 'FARROW'>
HASH = <TokenType.HASH: 'HASH'>
HASH_ARROW = <TokenType.HASH_ARROW: 'HASH_ARROW'>
DHASH_ARROW = <TokenType.DHASH_ARROW: 'DHASH_ARROW'>
LR_ARROW = <TokenType.LR_ARROW: 'LR_ARROW'>
DAT = <TokenType.DAT: 'DAT'>
LT_AT = <TokenType.LT_AT: 'LT_AT'>
AT_GT = <TokenType.AT_GT: 'AT_GT'>
DOLLAR = <TokenType.DOLLAR: 'DOLLAR'>
PARAMETER = <TokenType.PARAMETER: 'PARAMETER'>
SESSION_PARAMETER = <TokenType.SESSION_PARAMETER: 'SESSION_PARAMETER'>
DAMP = <TokenType.DAMP: 'DAMP'>
XOR = <TokenType.XOR: 'XOR'>
DSTAR = <TokenType.DSTAR: 'DSTAR'>
BLOCK_START = <TokenType.BLOCK_START: 'BLOCK_START'>
BLOCK_END = <TokenType.BLOCK_END: 'BLOCK_END'>
SPACE = <TokenType.SPACE: 'SPACE'>
BREAK = <TokenType.BREAK: 'BREAK'>
STRING = <TokenType.STRING: 'STRING'>
NUMBER = <TokenType.NUMBER: 'NUMBER'>
IDENTIFIER = <TokenType.IDENTIFIER: 'IDENTIFIER'>
DATABASE = <TokenType.DATABASE: 'DATABASE'>
COLUMN = <TokenType.COLUMN: 'COLUMN'>
COLUMN_DEF = <TokenType.COLUMN_DEF: 'COLUMN_DEF'>
SCHEMA = <TokenType.SCHEMA: 'SCHEMA'>
TABLE = <TokenType.TABLE: 'TABLE'>
WAREHOUSE = <TokenType.WAREHOUSE: 'WAREHOUSE'>
STREAMLIT = <TokenType.STREAMLIT: 'STREAMLIT'>
VAR = <TokenType.VAR: 'VAR'>
BIT_STRING = <TokenType.BIT_STRING: 'BIT_STRING'>
HEX_STRING = <TokenType.HEX_STRING: 'HEX_STRING'>
BYTE_STRING = <TokenType.BYTE_STRING: 'BYTE_STRING'>
NATIONAL_STRING = <TokenType.NATIONAL_STRING: 'NATIONAL_STRING'>
RAW_STRING = <TokenType.RAW_STRING: 'RAW_STRING'>
HEREDOC_STRING = <TokenType.HEREDOC_STRING: 'HEREDOC_STRING'>
UNICODE_STRING = <TokenType.UNICODE_STRING: 'UNICODE_STRING'>
BIT = <TokenType.BIT: 'BIT'>
BOOLEAN = <TokenType.BOOLEAN: 'BOOLEAN'>
TINYINT = <TokenType.TINYINT: 'TINYINT'>
UTINYINT = <TokenType.UTINYINT: 'UTINYINT'>
SMALLINT = <TokenType.SMALLINT: 'SMALLINT'>
USMALLINT = <TokenType.USMALLINT: 'USMALLINT'>
MEDIUMINT = <TokenType.MEDIUMINT: 'MEDIUMINT'>
UMEDIUMINT = <TokenType.UMEDIUMINT: 'UMEDIUMINT'>
INT = <TokenType.INT: 'INT'>
UINT = <TokenType.UINT: 'UINT'>
BIGINT = <TokenType.BIGINT: 'BIGINT'>
UBIGINT = <TokenType.UBIGINT: 'UBIGINT'>
INT128 = <TokenType.INT128: 'INT128'>
UINT128 = <TokenType.UINT128: 'UINT128'>
INT256 = <TokenType.INT256: 'INT256'>
UINT256 = <TokenType.UINT256: 'UINT256'>
FLOAT = <TokenType.FLOAT: 'FLOAT'>
DOUBLE = <TokenType.DOUBLE: 'DOUBLE'>
DECIMAL = <TokenType.DECIMAL: 'DECIMAL'>
DECIMAL32 = <TokenType.DECIMAL32: 'DECIMAL32'>
DECIMAL64 = <TokenType.DECIMAL64: 'DECIMAL64'>
DECIMAL128 = <TokenType.DECIMAL128: 'DECIMAL128'>
DECIMAL256 = <TokenType.DECIMAL256: 'DECIMAL256'>
UDECIMAL = <TokenType.UDECIMAL: 'UDECIMAL'>
BIGDECIMAL = <TokenType.BIGDECIMAL: 'BIGDECIMAL'>
CHAR = <TokenType.CHAR: 'CHAR'>
NCHAR = <TokenType.NCHAR: 'NCHAR'>
VARCHAR = <TokenType.VARCHAR: 'VARCHAR'>
NVARCHAR = <TokenType.NVARCHAR: 'NVARCHAR'>
BPCHAR = <TokenType.BPCHAR: 'BPCHAR'>
TEXT = <TokenType.TEXT: 'TEXT'>
MEDIUMTEXT = <TokenType.MEDIUMTEXT: 'MEDIUMTEXT'>
LONGTEXT = <TokenType.LONGTEXT: 'LONGTEXT'>
MEDIUMBLOB = <TokenType.MEDIUMBLOB: 'MEDIUMBLOB'>
LONGBLOB = <TokenType.LONGBLOB: 'LONGBLOB'>
TINYBLOB = <TokenType.TINYBLOB: 'TINYBLOB'>
TINYTEXT = <TokenType.TINYTEXT: 'TINYTEXT'>
NAME = <TokenType.NAME: 'NAME'>
BINARY = <TokenType.BINARY: 'BINARY'>
VARBINARY = <TokenType.VARBINARY: 'VARBINARY'>
JSON = <TokenType.JSON: 'JSON'>
JSONB = <TokenType.JSONB: 'JSONB'>
TIME = <TokenType.TIME: 'TIME'>
TIMETZ = <TokenType.TIMETZ: 'TIMETZ'>
TIMESTAMP = <TokenType.TIMESTAMP: 'TIMESTAMP'>
TIMESTAMPTZ = <TokenType.TIMESTAMPTZ: 'TIMESTAMPTZ'>
TIMESTAMPLTZ = <TokenType.TIMESTAMPLTZ: 'TIMESTAMPLTZ'>
TIMESTAMPNTZ = <TokenType.TIMESTAMPNTZ: 'TIMESTAMPNTZ'>
TIMESTAMP_S = <TokenType.TIMESTAMP_S: 'TIMESTAMP_S'>
TIMESTAMP_MS = <TokenType.TIMESTAMP_MS: 'TIMESTAMP_MS'>
TIMESTAMP_NS = <TokenType.TIMESTAMP_NS: 'TIMESTAMP_NS'>
DATETIME = <TokenType.DATETIME: 'DATETIME'>
DATETIME2 = <TokenType.DATETIME2: 'DATETIME2'>
DATETIME64 = <TokenType.DATETIME64: 'DATETIME64'>
SMALLDATETIME = <TokenType.SMALLDATETIME: 'SMALLDATETIME'>
DATE = <TokenType.DATE: 'DATE'>
DATE32 = <TokenType.DATE32: 'DATE32'>
INT4RANGE = <TokenType.INT4RANGE: 'INT4RANGE'>
INT4MULTIRANGE = <TokenType.INT4MULTIRANGE: 'INT4MULTIRANGE'>
INT8RANGE = <TokenType.INT8RANGE: 'INT8RANGE'>
INT8MULTIRANGE = <TokenType.INT8MULTIRANGE: 'INT8MULTIRANGE'>
NUMRANGE = <TokenType.NUMRANGE: 'NUMRANGE'>
NUMMULTIRANGE = <TokenType.NUMMULTIRANGE: 'NUMMULTIRANGE'>
TSRANGE = <TokenType.TSRANGE: 'TSRANGE'>
TSMULTIRANGE = <TokenType.TSMULTIRANGE: 'TSMULTIRANGE'>
TSTZRANGE = <TokenType.TSTZRANGE: 'TSTZRANGE'>
TSTZMULTIRANGE = <TokenType.TSTZMULTIRANGE: 'TSTZMULTIRANGE'>
DATERANGE = <TokenType.DATERANGE: 'DATERANGE'>
DATEMULTIRANGE = <TokenType.DATEMULTIRANGE: 'DATEMULTIRANGE'>
UUID = <TokenType.UUID: 'UUID'>
GEOGRAPHY = <TokenType.GEOGRAPHY: 'GEOGRAPHY'>
NULLABLE = <TokenType.NULLABLE: 'NULLABLE'>
GEOMETRY = <TokenType.GEOMETRY: 'GEOMETRY'>
POINT = <TokenType.POINT: 'POINT'>
RING = <TokenType.RING: 'RING'>
LINESTRING = <TokenType.LINESTRING: 'LINESTRING'>
MULTILINESTRING = <TokenType.MULTILINESTRING: 'MULTILINESTRING'>
POLYGON = <TokenType.POLYGON: 'POLYGON'>
MULTIPOLYGON = <TokenType.MULTIPOLYGON: 'MULTIPOLYGON'>
HLLSKETCH = <TokenType.HLLSKETCH: 'HLLSKETCH'>
HSTORE = <TokenType.HSTORE: 'HSTORE'>
SUPER = <TokenType.SUPER: 'SUPER'>
SERIAL = <TokenType.SERIAL: 'SERIAL'>
SMALLSERIAL = <TokenType.SMALLSERIAL: 'SMALLSERIAL'>
BIGSERIAL = <TokenType.BIGSERIAL: 'BIGSERIAL'>
XML = <TokenType.XML: 'XML'>
YEAR = <TokenType.YEAR: 'YEAR'>
UNIQUEIDENTIFIER = <TokenType.UNIQUEIDENTIFIER: 'UNIQUEIDENTIFIER'>
USERDEFINED = <TokenType.USERDEFINED: 'USERDEFINED'>
MONEY = <TokenType.MONEY: 'MONEY'>
SMALLMONEY = <TokenType.SMALLMONEY: 'SMALLMONEY'>
ROWVERSION = <TokenType.ROWVERSION: 'ROWVERSION'>
IMAGE = <TokenType.IMAGE: 'IMAGE'>
VARIANT = <TokenType.VARIANT: 'VARIANT'>
OBJECT = <TokenType.OBJECT: 'OBJECT'>
INET = <TokenType.INET: 'INET'>
IPADDRESS = <TokenType.IPADDRESS: 'IPADDRESS'>
IPPREFIX = <TokenType.IPPREFIX: 'IPPREFIX'>
IPV4 = <TokenType.IPV4: 'IPV4'>
IPV6 = <TokenType.IPV6: 'IPV6'>
ENUM = <TokenType.ENUM: 'ENUM'>
ENUM8 = <TokenType.ENUM8: 'ENUM8'>
ENUM16 = <TokenType.ENUM16: 'ENUM16'>
FIXEDSTRING = <TokenType.FIXEDSTRING: 'FIXEDSTRING'>
LOWCARDINALITY = <TokenType.LOWCARDINALITY: 'LOWCARDINALITY'>
NESTED = <TokenType.NESTED: 'NESTED'>
AGGREGATEFUNCTION = <TokenType.AGGREGATEFUNCTION: 'AGGREGATEFUNCTION'>
SIMPLEAGGREGATEFUNCTION = <TokenType.SIMPLEAGGREGATEFUNCTION: 'SIMPLEAGGREGATEFUNCTION'>
TDIGEST = <TokenType.TDIGEST: 'TDIGEST'>
UNKNOWN = <TokenType.UNKNOWN: 'UNKNOWN'>
VECTOR = <TokenType.VECTOR: 'VECTOR'>
ALIAS = <TokenType.ALIAS: 'ALIAS'>
ALTER = <TokenType.ALTER: 'ALTER'>
ALWAYS = <TokenType.ALWAYS: 'ALWAYS'>
ALL = <TokenType.ALL: 'ALL'>
ANTI = <TokenType.ANTI: 'ANTI'>
ANY = <TokenType.ANY: 'ANY'>
APPLY = <TokenType.APPLY: 'APPLY'>
ARRAY = <TokenType.ARRAY: 'ARRAY'>
ASC = <TokenType.ASC: 'ASC'>
ASOF = <TokenType.ASOF: 'ASOF'>
ATTACH = <TokenType.ATTACH: 'ATTACH'>
AUTO_INCREMENT = <TokenType.AUTO_INCREMENT: 'AUTO_INCREMENT'>
BEGIN = <TokenType.BEGIN: 'BEGIN'>
BETWEEN = <TokenType.BETWEEN: 'BETWEEN'>
BULK_COLLECT_INTO = <TokenType.BULK_COLLECT_INTO: 'BULK_COLLECT_INTO'>
CACHE = <TokenType.CACHE: 'CACHE'>
CASE = <TokenType.CASE: 'CASE'>
CHARACTER_SET = <TokenType.CHARACTER_SET: 'CHARACTER_SET'>
CLUSTER_BY = <TokenType.CLUSTER_BY: 'CLUSTER_BY'>
COLLATE = <TokenType.COLLATE: 'COLLATE'>
COMMAND = <TokenType.COMMAND: 'COMMAND'>
COMMENT = <TokenType.COMMENT: 'COMMENT'>
COMMIT = <TokenType.COMMIT: 'COMMIT'>
CONNECT_BY = <TokenType.CONNECT_BY: 'CONNECT_BY'>
CONSTRAINT = <TokenType.CONSTRAINT: 'CONSTRAINT'>
COPY = <TokenType.COPY: 'COPY'>
CREATE = <TokenType.CREATE: 'CREATE'>
CROSS = <TokenType.CROSS: 'CROSS'>
CUBE = <TokenType.CUBE: 'CUBE'>
CURRENT_DATE = <TokenType.CURRENT_DATE: 'CURRENT_DATE'>
CURRENT_DATETIME = <TokenType.CURRENT_DATETIME: 'CURRENT_DATETIME'>
CURRENT_TIME = <TokenType.CURRENT_TIME: 'CURRENT_TIME'>
CURRENT_TIMESTAMP = <TokenType.CURRENT_TIMESTAMP: 'CURRENT_TIMESTAMP'>
CURRENT_USER = <TokenType.CURRENT_USER: 'CURRENT_USER'>
DECLARE = <TokenType.DECLARE: 'DECLARE'>
DEFAULT = <TokenType.DEFAULT: 'DEFAULT'>
DELETE = <TokenType.DELETE: 'DELETE'>
DESC = <TokenType.DESC: 'DESC'>
DESCRIBE = <TokenType.DESCRIBE: 'DESCRIBE'>
DETACH = <TokenType.DETACH: 'DETACH'>
DICTIONARY = <TokenType.DICTIONARY: 'DICTIONARY'>
DISTINCT = <TokenType.DISTINCT: 'DISTINCT'>
DISTRIBUTE_BY = <TokenType.DISTRIBUTE_BY: 'DISTRIBUTE_BY'>
DIV = <TokenType.DIV: 'DIV'>
DROP = <TokenType.DROP: 'DROP'>
ELSE = <TokenType.ELSE: 'ELSE'>
END = <TokenType.END: 'END'>
ESCAPE = <TokenType.ESCAPE: 'ESCAPE'>
EXCEPT = <TokenType.EXCEPT: 'EXCEPT'>
EXECUTE = <TokenType.EXECUTE: 'EXECUTE'>
EXISTS = <TokenType.EXISTS: 'EXISTS'>
FALSE = <TokenType.FALSE: 'FALSE'>
FETCH = <TokenType.FETCH: 'FETCH'>
FILTER = <TokenType.FILTER: 'FILTER'>
FINAL = <TokenType.FINAL: 'FINAL'>
FIRST = <TokenType.FIRST: 'FIRST'>
FOR = <TokenType.FOR: 'FOR'>
FORCE = <TokenType.FORCE: 'FORCE'>
FOREIGN_KEY = <TokenType.FOREIGN_KEY: 'FOREIGN_KEY'>
FORMAT = <TokenType.FORMAT: 'FORMAT'>
FROM = <TokenType.FROM: 'FROM'>
FULL = <TokenType.FULL: 'FULL'>
FUNCTION = <TokenType.FUNCTION: 'FUNCTION'>
GLOB = <TokenType.GLOB: 'GLOB'>
GLOBAL = <TokenType.GLOBAL: 'GLOBAL'>
GRANT = <TokenType.GRANT: 'GRANT'>
GROUP_BY = <TokenType.GROUP_BY: 'GROUP_BY'>
GROUPING_SETS = <TokenType.GROUPING_SETS: 'GROUPING_SETS'>
HAVING = <TokenType.HAVING: 'HAVING'>
HINT = <TokenType.HINT: 'HINT'>
IGNORE = <TokenType.IGNORE: 'IGNORE'>
ILIKE = <TokenType.ILIKE: 'ILIKE'>
ILIKE_ANY = <TokenType.ILIKE_ANY: 'ILIKE_ANY'>
IN = <TokenType.IN: 'IN'>
INDEX = <TokenType.INDEX: 'INDEX'>
INNER = <TokenType.INNER: 'INNER'>
INSERT = <TokenType.INSERT: 'INSERT'>
INTERSECT = <TokenType.INTERSECT: 'INTERSECT'>
INTERVAL = <TokenType.INTERVAL: 'INTERVAL'>
INTO = <TokenType.INTO: 'INTO'>
INTRODUCER = <TokenType.INTRODUCER: 'INTRODUCER'>
IRLIKE = <TokenType.IRLIKE: 'IRLIKE'>
IS = <TokenType.IS: 'IS'>
ISNULL = <TokenType.ISNULL: 'ISNULL'>
JOIN = <TokenType.JOIN: 'JOIN'>
JOIN_MARKER = <TokenType.JOIN_MARKER: 'JOIN_MARKER'>
KEEP = <TokenType.KEEP: 'KEEP'>
KEY = <TokenType.KEY: 'KEY'>
KILL = <TokenType.KILL: 'KILL'>
LANGUAGE = <TokenType.LANGUAGE: 'LANGUAGE'>
LATERAL = <TokenType.LATERAL: 'LATERAL'>
LEFT = <TokenType.LEFT: 'LEFT'>
LIKE = <TokenType.LIKE: 'LIKE'>
LIKE_ANY = <TokenType.LIKE_ANY: 'LIKE_ANY'>
LIMIT = <TokenType.LIMIT: 'LIMIT'>
LIST = <TokenType.LIST: 'LIST'>
LOAD = <TokenType.LOAD: 'LOAD'>
LOCK = <TokenType.LOCK: 'LOCK'>
MAP = <TokenType.MAP: 'MAP'>
MATCH_CONDITION = <TokenType.MATCH_CONDITION: 'MATCH_CONDITION'>
MATCH_RECOGNIZE = <TokenType.MATCH_RECOGNIZE: 'MATCH_RECOGNIZE'>
MEMBER_OF = <TokenType.MEMBER_OF: 'MEMBER_OF'>
MERGE = <TokenType.MERGE: 'MERGE'>
MOD = <TokenType.MOD: 'MOD'>
MODEL = <TokenType.MODEL: 'MODEL'>
NATURAL = <TokenType.NATURAL: 'NATURAL'>
NEXT = <TokenType.NEXT: 'NEXT'>
NOTNULL = <TokenType.NOTNULL: 'NOTNULL'>
NULL = <TokenType.NULL: 'NULL'>
OBJECT_IDENTIFIER = <TokenType.OBJECT_IDENTIFIER: 'OBJECT_IDENTIFIER'>
OFFSET = <TokenType.OFFSET: 'OFFSET'>
ON = <TokenType.ON: 'ON'>
ONLY = <TokenType.ONLY: 'ONLY'>
OPERATOR = <TokenType.OPERATOR: 'OPERATOR'>
ORDER_BY = <TokenType.ORDER_BY: 'ORDER_BY'>
ORDER_SIBLINGS_BY = <TokenType.ORDER_SIBLINGS_BY: 'ORDER_SIBLINGS_BY'>
ORDERED = <TokenType.ORDERED: 'ORDERED'>
ORDINALITY = <TokenType.ORDINALITY: 'ORDINALITY'>
OUTER = <TokenType.OUTER: 'OUTER'>
OVER = <TokenType.OVER: 'OVER'>
OVERLAPS = <TokenType.OVERLAPS: 'OVERLAPS'>
OVERWRITE = <TokenType.OVERWRITE: 'OVERWRITE'>
PARTITION = <TokenType.PARTITION: 'PARTITION'>
PARTITION_BY = <TokenType.PARTITION_BY: 'PARTITION_BY'>
PERCENT = <TokenType.PERCENT: 'PERCENT'>
PIVOT = <TokenType.PIVOT: 'PIVOT'>
PLACEHOLDER = <TokenType.PLACEHOLDER: 'PLACEHOLDER'>
POSITIONAL = <TokenType.POSITIONAL: 'POSITIONAL'>
PRAGMA = <TokenType.PRAGMA: 'PRAGMA'>
PREWHERE = <TokenType.PREWHERE: 'PREWHERE'>
PRIMARY_KEY = <TokenType.PRIMARY_KEY: 'PRIMARY_KEY'>
PROCEDURE = <TokenType.PROCEDURE: 'PROCEDURE'>
PROPERTIES = <TokenType.PROPERTIES: 'PROPERTIES'>
PSEUDO_TYPE = <TokenType.PSEUDO_TYPE: 'PSEUDO_TYPE'>
QUALIFY = <TokenType.QUALIFY: 'QUALIFY'>
QUOTE = <TokenType.QUOTE: 'QUOTE'>
RANGE = <TokenType.RANGE: 'RANGE'>
RECURSIVE = <TokenType.RECURSIVE: 'RECURSIVE'>
REFRESH = <TokenType.REFRESH: 'REFRESH'>
RENAME = <TokenType.RENAME: 'RENAME'>
REPLACE = <TokenType.REPLACE: 'REPLACE'>
RETURNING = <TokenType.RETURNING: 'RETURNING'>
REFERENCES = <TokenType.REFERENCES: 'REFERENCES'>
RIGHT = <TokenType.RIGHT: 'RIGHT'>
RLIKE = <TokenType.RLIKE: 'RLIKE'>
ROLLBACK = <TokenType.ROLLBACK: 'ROLLBACK'>
ROLLUP = <TokenType.ROLLUP: 'ROLLUP'>
ROW = <TokenType.ROW: 'ROW'>
ROWS = <TokenType.ROWS: 'ROWS'>
SELECT = <TokenType.SELECT: 'SELECT'>
SEMI = <TokenType.SEMI: 'SEMI'>
SEPARATOR = <TokenType.SEPARATOR: 'SEPARATOR'>
SEQUENCE = <TokenType.SEQUENCE: 'SEQUENCE'>
SERDE_PROPERTIES = <TokenType.SERDE_PROPERTIES: 'SERDE_PROPERTIES'>
SET = <TokenType.SET: 'SET'>
SETTINGS = <TokenType.SETTINGS: 'SETTINGS'>
SHOW = <TokenType.SHOW: 'SHOW'>
SIMILAR_TO = <TokenType.SIMILAR_TO: 'SIMILAR_TO'>
SOME = <TokenType.SOME: 'SOME'>
SORT_BY = <TokenType.SORT_BY: 'SORT_BY'>
START_WITH = <TokenType.START_WITH: 'START_WITH'>
STORAGE_INTEGRATION = <TokenType.STORAGE_INTEGRATION: 'STORAGE_INTEGRATION'>
STRAIGHT_JOIN = <TokenType.STRAIGHT_JOIN: 'STRAIGHT_JOIN'>
STRUCT = <TokenType.STRUCT: 'STRUCT'>
SUMMARIZE = <TokenType.SUMMARIZE: 'SUMMARIZE'>
TABLE_SAMPLE = <TokenType.TABLE_SAMPLE: 'TABLE_SAMPLE'>
TAG = <TokenType.TAG: 'TAG'>
TEMPORARY = <TokenType.TEMPORARY: 'TEMPORARY'>
TOP = <TokenType.TOP: 'TOP'>
THEN = <TokenType.THEN: 'THEN'>
TRUE = <TokenType.TRUE: 'TRUE'>
TRUNCATE = <TokenType.TRUNCATE: 'TRUNCATE'>
UNCACHE = <TokenType.UNCACHE: 'UNCACHE'>
UNION = <TokenType.UNION: 'UNION'>
UNNEST = <TokenType.UNNEST: 'UNNEST'>
UNPIVOT = <TokenType.UNPIVOT: 'UNPIVOT'>
UPDATE = <TokenType.UPDATE: 'UPDATE'>
USE = <TokenType.USE: 'USE'>
USING = <TokenType.USING: 'USING'>
VALUES = <TokenType.VALUES: 'VALUES'>
VIEW = <TokenType.VIEW: 'VIEW'>
VOLATILE = <TokenType.VOLATILE: 'VOLATILE'>
WHEN = <TokenType.WHEN: 'WHEN'>
WHERE = <TokenType.WHERE: 'WHERE'>
WINDOW = <TokenType.WINDOW: 'WINDOW'>
WITH = <TokenType.WITH: 'WITH'>
UNIQUE = <TokenType.UNIQUE: 'UNIQUE'>
VERSION_SNAPSHOT = <TokenType.VERSION_SNAPSHOT: 'VERSION_SNAPSHOT'>
TIMESTAMP_SNAPSHOT = <TokenType.TIMESTAMP_SNAPSHOT: 'TIMESTAMP_SNAPSHOT'>
OPTION = <TokenType.OPTION: 'OPTION'>
SINK = <TokenType.SINK: 'SINK'>
SOURCE = <TokenType.SOURCE: 'SOURCE'>
class Token:
420class Token:
421    __slots__ = ("token_type", "text", "line", "col", "start", "end", "comments")
422
423    @classmethod
424    def number(cls, number: int) -> Token:
425        """Returns a NUMBER token with `number` as its text."""
426        return cls(TokenType.NUMBER, str(number))
427
428    @classmethod
429    def string(cls, string: str) -> Token:
430        """Returns a STRING token with `string` as its text."""
431        return cls(TokenType.STRING, string)
432
433    @classmethod
434    def identifier(cls, identifier: str) -> Token:
435        """Returns an IDENTIFIER token with `identifier` as its text."""
436        return cls(TokenType.IDENTIFIER, identifier)
437
438    @classmethod
439    def var(cls, var: str) -> Token:
440        """Returns an VAR token with `var` as its text."""
441        return cls(TokenType.VAR, var)
442
443    def __init__(
444        self,
445        token_type: TokenType,
446        text: str,
447        line: int = 1,
448        col: int = 1,
449        start: int = 0,
450        end: int = 0,
451        comments: t.Optional[t.List[str]] = None,
452    ) -> None:
453        """Token initializer.
454
455        Args:
456            token_type: The TokenType Enum.
457            text: The text of the token.
458            line: The line that the token ends on.
459            col: The column that the token ends on.
460            start: The start index of the token.
461            end: The ending index of the token.
462            comments: The comments to attach to the token.
463        """
464        self.token_type = token_type
465        self.text = text
466        self.line = line
467        self.col = col
468        self.start = start
469        self.end = end
470        self.comments = [] if comments is None else comments
471
472    def __repr__(self) -> str:
473        attributes = ", ".join(f"{k}: {getattr(self, k)}" for k in self.__slots__)
474        return f"<Token {attributes}>"
Token( token_type: TokenType, text: str, line: int = 1, col: int = 1, start: int = 0, end: int = 0, comments: Optional[List[str]] = None)
443    def __init__(
444        self,
445        token_type: TokenType,
446        text: str,
447        line: int = 1,
448        col: int = 1,
449        start: int = 0,
450        end: int = 0,
451        comments: t.Optional[t.List[str]] = None,
452    ) -> None:
453        """Token initializer.
454
455        Args:
456            token_type: The TokenType Enum.
457            text: The text of the token.
458            line: The line that the token ends on.
459            col: The column that the token ends on.
460            start: The start index of the token.
461            end: The ending index of the token.
462            comments: The comments to attach to the token.
463        """
464        self.token_type = token_type
465        self.text = text
466        self.line = line
467        self.col = col
468        self.start = start
469        self.end = end
470        self.comments = [] if comments is None else comments

Token initializer.

Arguments:
  • token_type: The TokenType Enum.
  • text: The text of the token.
  • line: The line that the token ends on.
  • col: The column that the token ends on.
  • start: The start index of the token.
  • end: The ending index of the token.
  • comments: The comments to attach to the token.
@classmethod
def number(cls, number: int) -> Token:
423    @classmethod
424    def number(cls, number: int) -> Token:
425        """Returns a NUMBER token with `number` as its text."""
426        return cls(TokenType.NUMBER, str(number))

Returns a NUMBER token with number as its text.

@classmethod
def string(cls, string: str) -> Token:
428    @classmethod
429    def string(cls, string: str) -> Token:
430        """Returns a STRING token with `string` as its text."""
431        return cls(TokenType.STRING, string)

Returns a STRING token with string as its text.

@classmethod
def identifier(cls, identifier: str) -> Token:
433    @classmethod
434    def identifier(cls, identifier: str) -> Token:
435        """Returns an IDENTIFIER token with `identifier` as its text."""
436        return cls(TokenType.IDENTIFIER, identifier)

Returns an IDENTIFIER token with identifier as its text.

@classmethod
def var(cls, var: str) -> Token:
438    @classmethod
439    def var(cls, var: str) -> Token:
440        """Returns an VAR token with `var` as its text."""
441        return cls(TokenType.VAR, var)

Returns an VAR token with var as its text.

token_type
text
line
col
start
end
comments
class Tokenizer:
 584class Tokenizer(metaclass=_Tokenizer):
 585    SINGLE_TOKENS = {
 586        "(": TokenType.L_PAREN,
 587        ")": TokenType.R_PAREN,
 588        "[": TokenType.L_BRACKET,
 589        "]": TokenType.R_BRACKET,
 590        "{": TokenType.L_BRACE,
 591        "}": TokenType.R_BRACE,
 592        "&": TokenType.AMP,
 593        "^": TokenType.CARET,
 594        ":": TokenType.COLON,
 595        ",": TokenType.COMMA,
 596        ".": TokenType.DOT,
 597        "-": TokenType.DASH,
 598        "=": TokenType.EQ,
 599        ">": TokenType.GT,
 600        "<": TokenType.LT,
 601        "%": TokenType.MOD,
 602        "!": TokenType.NOT,
 603        "|": TokenType.PIPE,
 604        "+": TokenType.PLUS,
 605        ";": TokenType.SEMICOLON,
 606        "/": TokenType.SLASH,
 607        "\\": TokenType.BACKSLASH,
 608        "*": TokenType.STAR,
 609        "~": TokenType.TILDA,
 610        "?": TokenType.PLACEHOLDER,
 611        "@": TokenType.PARAMETER,
 612        "#": TokenType.HASH,
 613        # Used for breaking a var like x'y' but nothing else the token type doesn't matter
 614        "'": TokenType.UNKNOWN,
 615        "`": TokenType.UNKNOWN,
 616        '"': TokenType.UNKNOWN,
 617    }
 618
 619    BIT_STRINGS: t.List[str | t.Tuple[str, str]] = []
 620    BYTE_STRINGS: t.List[str | t.Tuple[str, str]] = []
 621    HEX_STRINGS: t.List[str | t.Tuple[str, str]] = []
 622    RAW_STRINGS: t.List[str | t.Tuple[str, str]] = []
 623    HEREDOC_STRINGS: t.List[str | t.Tuple[str, str]] = []
 624    UNICODE_STRINGS: t.List[str | t.Tuple[str, str]] = []
 625    IDENTIFIERS: t.List[str | t.Tuple[str, str]] = ['"']
 626    QUOTES: t.List[t.Tuple[str, str] | str] = ["'"]
 627    STRING_ESCAPES = ["'"]
 628    VAR_SINGLE_TOKENS: t.Set[str] = set()
 629
 630    # The strings in this list can always be used as escapes, regardless of the surrounding
 631    # identifier delimiters. By default, the closing delimiter is assumed to also act as an
 632    # identifier escape, e.g. if we use double-quotes, then they also act as escapes: "x"""
 633    IDENTIFIER_ESCAPES: t.List[str] = []
 634
 635    # Whether the heredoc tags follow the same lexical rules as unquoted identifiers
 636    HEREDOC_TAG_IS_IDENTIFIER = False
 637
 638    # Token that we'll generate as a fallback if the heredoc prefix doesn't correspond to a heredoc
 639    HEREDOC_STRING_ALTERNATIVE = TokenType.VAR
 640
 641    # Whether string escape characters function as such when placed within raw strings
 642    STRING_ESCAPES_ALLOWED_IN_RAW_STRINGS = True
 643
 644    NESTED_COMMENTS = True
 645
 646    HINT_START = "/*+"
 647
 648    TOKENS_PRECEDING_HINT = {TokenType.SELECT, TokenType.INSERT, TokenType.UPDATE, TokenType.DELETE}
 649
 650    # Autofilled
 651    _COMMENTS: t.Dict[str, str] = {}
 652    _FORMAT_STRINGS: t.Dict[str, t.Tuple[str, TokenType]] = {}
 653    _IDENTIFIERS: t.Dict[str, str] = {}
 654    _IDENTIFIER_ESCAPES: t.Set[str] = set()
 655    _QUOTES: t.Dict[str, str] = {}
 656    _STRING_ESCAPES: t.Set[str] = set()
 657    _KEYWORD_TRIE: t.Dict = {}
 658    _RS_TOKENIZER: t.Optional[t.Any] = None
 659
 660    KEYWORDS: t.Dict[str, TokenType] = {
 661        **{f"{{%{postfix}": TokenType.BLOCK_START for postfix in ("", "+", "-")},
 662        **{f"{prefix}%}}": TokenType.BLOCK_END for prefix in ("", "+", "-")},
 663        **{f"{{{{{postfix}": TokenType.BLOCK_START for postfix in ("+", "-")},
 664        **{f"{prefix}}}}}": TokenType.BLOCK_END for prefix in ("+", "-")},
 665        HINT_START: TokenType.HINT,
 666        "==": TokenType.EQ,
 667        "::": TokenType.DCOLON,
 668        "||": TokenType.DPIPE,
 669        ">=": TokenType.GTE,
 670        "<=": TokenType.LTE,
 671        "<>": TokenType.NEQ,
 672        "!=": TokenType.NEQ,
 673        ":=": TokenType.COLON_EQ,
 674        "<=>": TokenType.NULLSAFE_EQ,
 675        "->": TokenType.ARROW,
 676        "->>": TokenType.DARROW,
 677        "=>": TokenType.FARROW,
 678        "#>": TokenType.HASH_ARROW,
 679        "#>>": TokenType.DHASH_ARROW,
 680        "<->": TokenType.LR_ARROW,
 681        "&&": TokenType.DAMP,
 682        "??": TokenType.DQMARK,
 683        "~~~": TokenType.GLOB,
 684        "~~": TokenType.LIKE,
 685        "~~*": TokenType.ILIKE,
 686        "~*": TokenType.IRLIKE,
 687        "ALL": TokenType.ALL,
 688        "ALWAYS": TokenType.ALWAYS,
 689        "AND": TokenType.AND,
 690        "ANTI": TokenType.ANTI,
 691        "ANY": TokenType.ANY,
 692        "ASC": TokenType.ASC,
 693        "AS": TokenType.ALIAS,
 694        "ASOF": TokenType.ASOF,
 695        "AUTOINCREMENT": TokenType.AUTO_INCREMENT,
 696        "AUTO_INCREMENT": TokenType.AUTO_INCREMENT,
 697        "BEGIN": TokenType.BEGIN,
 698        "BETWEEN": TokenType.BETWEEN,
 699        "CACHE": TokenType.CACHE,
 700        "UNCACHE": TokenType.UNCACHE,
 701        "CASE": TokenType.CASE,
 702        "CHARACTER SET": TokenType.CHARACTER_SET,
 703        "CLUSTER BY": TokenType.CLUSTER_BY,
 704        "COLLATE": TokenType.COLLATE,
 705        "COLUMN": TokenType.COLUMN,
 706        "COMMIT": TokenType.COMMIT,
 707        "CONNECT BY": TokenType.CONNECT_BY,
 708        "CONSTRAINT": TokenType.CONSTRAINT,
 709        "COPY": TokenType.COPY,
 710        "CREATE": TokenType.CREATE,
 711        "CROSS": TokenType.CROSS,
 712        "CUBE": TokenType.CUBE,
 713        "CURRENT_DATE": TokenType.CURRENT_DATE,
 714        "CURRENT_TIME": TokenType.CURRENT_TIME,
 715        "CURRENT_TIMESTAMP": TokenType.CURRENT_TIMESTAMP,
 716        "CURRENT_USER": TokenType.CURRENT_USER,
 717        "DATABASE": TokenType.DATABASE,
 718        "DEFAULT": TokenType.DEFAULT,
 719        "DELETE": TokenType.DELETE,
 720        "DESC": TokenType.DESC,
 721        "DESCRIBE": TokenType.DESCRIBE,
 722        "DISTINCT": TokenType.DISTINCT,
 723        "DISTRIBUTE BY": TokenType.DISTRIBUTE_BY,
 724        "DIV": TokenType.DIV,
 725        "DROP": TokenType.DROP,
 726        "ELSE": TokenType.ELSE,
 727        "END": TokenType.END,
 728        "ENUM": TokenType.ENUM,
 729        "ESCAPE": TokenType.ESCAPE,
 730        "EXCEPT": TokenType.EXCEPT,
 731        "EXECUTE": TokenType.EXECUTE,
 732        "EXISTS": TokenType.EXISTS,
 733        "FALSE": TokenType.FALSE,
 734        "FETCH": TokenType.FETCH,
 735        "FILTER": TokenType.FILTER,
 736        "FIRST": TokenType.FIRST,
 737        "FULL": TokenType.FULL,
 738        "FUNCTION": TokenType.FUNCTION,
 739        "FOR": TokenType.FOR,
 740        "FOREIGN KEY": TokenType.FOREIGN_KEY,
 741        "FORMAT": TokenType.FORMAT,
 742        "FROM": TokenType.FROM,
 743        "GEOGRAPHY": TokenType.GEOGRAPHY,
 744        "GEOMETRY": TokenType.GEOMETRY,
 745        "GLOB": TokenType.GLOB,
 746        "GROUP BY": TokenType.GROUP_BY,
 747        "GROUPING SETS": TokenType.GROUPING_SETS,
 748        "HAVING": TokenType.HAVING,
 749        "ILIKE": TokenType.ILIKE,
 750        "IN": TokenType.IN,
 751        "INDEX": TokenType.INDEX,
 752        "INET": TokenType.INET,
 753        "INNER": TokenType.INNER,
 754        "INSERT": TokenType.INSERT,
 755        "INTERVAL": TokenType.INTERVAL,
 756        "INTERSECT": TokenType.INTERSECT,
 757        "INTO": TokenType.INTO,
 758        "IS": TokenType.IS,
 759        "ISNULL": TokenType.ISNULL,
 760        "JOIN": TokenType.JOIN,
 761        "KEEP": TokenType.KEEP,
 762        "KILL": TokenType.KILL,
 763        "LATERAL": TokenType.LATERAL,
 764        "LEFT": TokenType.LEFT,
 765        "LIKE": TokenType.LIKE,
 766        "LIMIT": TokenType.LIMIT,
 767        "LOAD": TokenType.LOAD,
 768        "LOCK": TokenType.LOCK,
 769        "MERGE": TokenType.MERGE,
 770        "NATURAL": TokenType.NATURAL,
 771        "NEXT": TokenType.NEXT,
 772        "NOT": TokenType.NOT,
 773        "NOTNULL": TokenType.NOTNULL,
 774        "NULL": TokenType.NULL,
 775        "OBJECT": TokenType.OBJECT,
 776        "OFFSET": TokenType.OFFSET,
 777        "ON": TokenType.ON,
 778        "OR": TokenType.OR,
 779        "XOR": TokenType.XOR,
 780        "ORDER BY": TokenType.ORDER_BY,
 781        "ORDINALITY": TokenType.ORDINALITY,
 782        "OUTER": TokenType.OUTER,
 783        "OVER": TokenType.OVER,
 784        "OVERLAPS": TokenType.OVERLAPS,
 785        "OVERWRITE": TokenType.OVERWRITE,
 786        "PARTITION": TokenType.PARTITION,
 787        "PARTITION BY": TokenType.PARTITION_BY,
 788        "PARTITIONED BY": TokenType.PARTITION_BY,
 789        "PARTITIONED_BY": TokenType.PARTITION_BY,
 790        "PERCENT": TokenType.PERCENT,
 791        "PIVOT": TokenType.PIVOT,
 792        "PRAGMA": TokenType.PRAGMA,
 793        "PRIMARY KEY": TokenType.PRIMARY_KEY,
 794        "PROCEDURE": TokenType.PROCEDURE,
 795        "QUALIFY": TokenType.QUALIFY,
 796        "RANGE": TokenType.RANGE,
 797        "RECURSIVE": TokenType.RECURSIVE,
 798        "REGEXP": TokenType.RLIKE,
 799        "RENAME": TokenType.RENAME,
 800        "REPLACE": TokenType.REPLACE,
 801        "RETURNING": TokenType.RETURNING,
 802        "REFERENCES": TokenType.REFERENCES,
 803        "RIGHT": TokenType.RIGHT,
 804        "RLIKE": TokenType.RLIKE,
 805        "ROLLBACK": TokenType.ROLLBACK,
 806        "ROLLUP": TokenType.ROLLUP,
 807        "ROW": TokenType.ROW,
 808        "ROWS": TokenType.ROWS,
 809        "SCHEMA": TokenType.SCHEMA,
 810        "SELECT": TokenType.SELECT,
 811        "SEMI": TokenType.SEMI,
 812        "SET": TokenType.SET,
 813        "SETTINGS": TokenType.SETTINGS,
 814        "SHOW": TokenType.SHOW,
 815        "SIMILAR TO": TokenType.SIMILAR_TO,
 816        "SOME": TokenType.SOME,
 817        "SORT BY": TokenType.SORT_BY,
 818        "START WITH": TokenType.START_WITH,
 819        "STRAIGHT_JOIN": TokenType.STRAIGHT_JOIN,
 820        "TABLE": TokenType.TABLE,
 821        "TABLESAMPLE": TokenType.TABLE_SAMPLE,
 822        "TEMP": TokenType.TEMPORARY,
 823        "TEMPORARY": TokenType.TEMPORARY,
 824        "THEN": TokenType.THEN,
 825        "TRUE": TokenType.TRUE,
 826        "TRUNCATE": TokenType.TRUNCATE,
 827        "UNION": TokenType.UNION,
 828        "UNKNOWN": TokenType.UNKNOWN,
 829        "UNNEST": TokenType.UNNEST,
 830        "UNPIVOT": TokenType.UNPIVOT,
 831        "UPDATE": TokenType.UPDATE,
 832        "USE": TokenType.USE,
 833        "USING": TokenType.USING,
 834        "UUID": TokenType.UUID,
 835        "VALUES": TokenType.VALUES,
 836        "VIEW": TokenType.VIEW,
 837        "VOLATILE": TokenType.VOLATILE,
 838        "WHEN": TokenType.WHEN,
 839        "WHERE": TokenType.WHERE,
 840        "WINDOW": TokenType.WINDOW,
 841        "WITH": TokenType.WITH,
 842        "APPLY": TokenType.APPLY,
 843        "ARRAY": TokenType.ARRAY,
 844        "BIT": TokenType.BIT,
 845        "BOOL": TokenType.BOOLEAN,
 846        "BOOLEAN": TokenType.BOOLEAN,
 847        "BYTE": TokenType.TINYINT,
 848        "MEDIUMINT": TokenType.MEDIUMINT,
 849        "INT1": TokenType.TINYINT,
 850        "TINYINT": TokenType.TINYINT,
 851        "INT16": TokenType.SMALLINT,
 852        "SHORT": TokenType.SMALLINT,
 853        "SMALLINT": TokenType.SMALLINT,
 854        "INT128": TokenType.INT128,
 855        "HUGEINT": TokenType.INT128,
 856        "UHUGEINT": TokenType.UINT128,
 857        "INT2": TokenType.SMALLINT,
 858        "INTEGER": TokenType.INT,
 859        "INT": TokenType.INT,
 860        "INT4": TokenType.INT,
 861        "INT32": TokenType.INT,
 862        "INT64": TokenType.BIGINT,
 863        "LONG": TokenType.BIGINT,
 864        "BIGINT": TokenType.BIGINT,
 865        "INT8": TokenType.TINYINT,
 866        "UINT": TokenType.UINT,
 867        "DEC": TokenType.DECIMAL,
 868        "DECIMAL": TokenType.DECIMAL,
 869        "DECIMAL32": TokenType.DECIMAL32,
 870        "DECIMAL64": TokenType.DECIMAL64,
 871        "DECIMAL128": TokenType.DECIMAL128,
 872        "DECIMAL256": TokenType.DECIMAL256,
 873        "BIGDECIMAL": TokenType.BIGDECIMAL,
 874        "BIGNUMERIC": TokenType.BIGDECIMAL,
 875        "LIST": TokenType.LIST,
 876        "MAP": TokenType.MAP,
 877        "NULLABLE": TokenType.NULLABLE,
 878        "NUMBER": TokenType.DECIMAL,
 879        "NUMERIC": TokenType.DECIMAL,
 880        "FIXED": TokenType.DECIMAL,
 881        "REAL": TokenType.FLOAT,
 882        "FLOAT": TokenType.FLOAT,
 883        "FLOAT4": TokenType.FLOAT,
 884        "FLOAT8": TokenType.DOUBLE,
 885        "DOUBLE": TokenType.DOUBLE,
 886        "DOUBLE PRECISION": TokenType.DOUBLE,
 887        "JSON": TokenType.JSON,
 888        "JSONB": TokenType.JSONB,
 889        "CHAR": TokenType.CHAR,
 890        "CHARACTER": TokenType.CHAR,
 891        "NCHAR": TokenType.NCHAR,
 892        "VARCHAR": TokenType.VARCHAR,
 893        "VARCHAR2": TokenType.VARCHAR,
 894        "NVARCHAR": TokenType.NVARCHAR,
 895        "NVARCHAR2": TokenType.NVARCHAR,
 896        "BPCHAR": TokenType.BPCHAR,
 897        "STR": TokenType.TEXT,
 898        "STRING": TokenType.TEXT,
 899        "TEXT": TokenType.TEXT,
 900        "LONGTEXT": TokenType.LONGTEXT,
 901        "MEDIUMTEXT": TokenType.MEDIUMTEXT,
 902        "TINYTEXT": TokenType.TINYTEXT,
 903        "CLOB": TokenType.TEXT,
 904        "LONGVARCHAR": TokenType.TEXT,
 905        "BINARY": TokenType.BINARY,
 906        "BLOB": TokenType.VARBINARY,
 907        "LONGBLOB": TokenType.LONGBLOB,
 908        "MEDIUMBLOB": TokenType.MEDIUMBLOB,
 909        "TINYBLOB": TokenType.TINYBLOB,
 910        "BYTEA": TokenType.VARBINARY,
 911        "VARBINARY": TokenType.VARBINARY,
 912        "TIME": TokenType.TIME,
 913        "TIMETZ": TokenType.TIMETZ,
 914        "TIMESTAMP": TokenType.TIMESTAMP,
 915        "TIMESTAMPTZ": TokenType.TIMESTAMPTZ,
 916        "TIMESTAMPLTZ": TokenType.TIMESTAMPLTZ,
 917        "TIMESTAMP_LTZ": TokenType.TIMESTAMPLTZ,
 918        "TIMESTAMPNTZ": TokenType.TIMESTAMPNTZ,
 919        "TIMESTAMP_NTZ": TokenType.TIMESTAMPNTZ,
 920        "DATE": TokenType.DATE,
 921        "DATETIME": TokenType.DATETIME,
 922        "INT4RANGE": TokenType.INT4RANGE,
 923        "INT4MULTIRANGE": TokenType.INT4MULTIRANGE,
 924        "INT8RANGE": TokenType.INT8RANGE,
 925        "INT8MULTIRANGE": TokenType.INT8MULTIRANGE,
 926        "NUMRANGE": TokenType.NUMRANGE,
 927        "NUMMULTIRANGE": TokenType.NUMMULTIRANGE,
 928        "TSRANGE": TokenType.TSRANGE,
 929        "TSMULTIRANGE": TokenType.TSMULTIRANGE,
 930        "TSTZRANGE": TokenType.TSTZRANGE,
 931        "TSTZMULTIRANGE": TokenType.TSTZMULTIRANGE,
 932        "DATERANGE": TokenType.DATERANGE,
 933        "DATEMULTIRANGE": TokenType.DATEMULTIRANGE,
 934        "UNIQUE": TokenType.UNIQUE,
 935        "VECTOR": TokenType.VECTOR,
 936        "STRUCT": TokenType.STRUCT,
 937        "SEQUENCE": TokenType.SEQUENCE,
 938        "VARIANT": TokenType.VARIANT,
 939        "ALTER": TokenType.ALTER,
 940        "ANALYZE": TokenType.COMMAND,
 941        "CALL": TokenType.COMMAND,
 942        "COMMENT": TokenType.COMMENT,
 943        "EXPLAIN": TokenType.COMMAND,
 944        "GRANT": TokenType.GRANT,
 945        "OPTIMIZE": TokenType.COMMAND,
 946        "PREPARE": TokenType.COMMAND,
 947        "VACUUM": TokenType.COMMAND,
 948        "USER-DEFINED": TokenType.USERDEFINED,
 949        "FOR VERSION": TokenType.VERSION_SNAPSHOT,
 950        "FOR TIMESTAMP": TokenType.TIMESTAMP_SNAPSHOT,
 951    }
 952
 953    WHITE_SPACE: t.Dict[t.Optional[str], TokenType] = {
 954        " ": TokenType.SPACE,
 955        "\t": TokenType.SPACE,
 956        "\n": TokenType.BREAK,
 957        "\r": TokenType.BREAK,
 958    }
 959
 960    COMMANDS = {
 961        TokenType.COMMAND,
 962        TokenType.EXECUTE,
 963        TokenType.FETCH,
 964        TokenType.SHOW,
 965        TokenType.RENAME,
 966    }
 967
 968    COMMAND_PREFIX_TOKENS = {TokenType.SEMICOLON, TokenType.BEGIN}
 969
 970    # Handle numeric literals like in hive (3L = BIGINT)
 971    NUMERIC_LITERALS: t.Dict[str, str] = {}
 972
 973    COMMENTS = ["--", ("/*", "*/")]
 974
 975    __slots__ = (
 976        "sql",
 977        "size",
 978        "tokens",
 979        "dialect",
 980        "_start",
 981        "_current",
 982        "_line",
 983        "_col",
 984        "_comments",
 985        "_char",
 986        "_end",
 987        "_peek",
 988        "_prev_token_line",
 989        "_rs_dialect_settings",
 990    )
 991
 992    def __init__(self, dialect: DialectType = None) -> None:
 993        from sqlglot.dialects import Dialect
 994
 995        self.dialect = Dialect.get_or_raise(dialect)
 996
 997        if USE_RS_TOKENIZER:
 998            self._rs_dialect_settings = RsTokenizerDialectSettings(
 999                unescaped_sequences=self.dialect.UNESCAPED_SEQUENCES,
1000                identifiers_can_start_with_digit=self.dialect.IDENTIFIERS_CAN_START_WITH_DIGIT,
1001            )
1002
1003        self.reset()
1004
1005    def reset(self) -> None:
1006        self.sql = ""
1007        self.size = 0
1008        self.tokens: t.List[Token] = []
1009        self._start = 0
1010        self._current = 0
1011        self._line = 1
1012        self._col = 0
1013        self._comments: t.List[str] = []
1014
1015        self._char = ""
1016        self._end = False
1017        self._peek = ""
1018        self._prev_token_line = -1
1019
1020    def tokenize(self, sql: str) -> t.List[Token]:
1021        """Returns a list of tokens corresponding to the SQL string `sql`."""
1022        if USE_RS_TOKENIZER:
1023            return self.tokenize_rs(sql)
1024
1025        self.reset()
1026        self.sql = sql
1027        self.size = len(sql)
1028
1029        try:
1030            self._scan()
1031        except Exception as e:
1032            start = max(self._current - 50, 0)
1033            end = min(self._current + 50, self.size - 1)
1034            context = self.sql[start:end]
1035            raise TokenError(f"Error tokenizing '{context}'") from e
1036
1037        return self.tokens
1038
1039    def _scan(self, until: t.Optional[t.Callable] = None) -> None:
1040        while self.size and not self._end:
1041            current = self._current
1042
1043            # Skip spaces here rather than iteratively calling advance() for performance reasons
1044            while current < self.size:
1045                char = self.sql[current]
1046
1047                if char.isspace() and (char == " " or char == "\t"):
1048                    current += 1
1049                else:
1050                    break
1051
1052            offset = current - self._current if current > self._current else 1
1053
1054            self._start = current
1055            self._advance(offset)
1056
1057            if not self._char.isspace():
1058                if self._char.isdigit():
1059                    self._scan_number()
1060                elif self._char in self._IDENTIFIERS:
1061                    self._scan_identifier(self._IDENTIFIERS[self._char])
1062                else:
1063                    self._scan_keywords()
1064
1065            if until and until():
1066                break
1067
1068        if self.tokens and self._comments:
1069            self.tokens[-1].comments.extend(self._comments)
1070
1071    def _chars(self, size: int) -> str:
1072        if size == 1:
1073            return self._char
1074
1075        start = self._current - 1
1076        end = start + size
1077
1078        return self.sql[start:end] if end <= self.size else ""
1079
1080    def _advance(self, i: int = 1, alnum: bool = False) -> None:
1081        if self.WHITE_SPACE.get(self._char) is TokenType.BREAK:
1082            # Ensures we don't count an extra line if we get a \r\n line break sequence
1083            if not (self._char == "\r" and self._peek == "\n"):
1084                self._col = 1
1085                self._line += 1
1086        else:
1087            self._col += i
1088
1089        self._current += i
1090        self._end = self._current >= self.size
1091        self._char = self.sql[self._current - 1]
1092        self._peek = "" if self._end else self.sql[self._current]
1093
1094        if alnum and self._char.isalnum():
1095            # Here we use local variables instead of attributes for better performance
1096            _col = self._col
1097            _current = self._current
1098            _end = self._end
1099            _peek = self._peek
1100
1101            while _peek.isalnum():
1102                _col += 1
1103                _current += 1
1104                _end = _current >= self.size
1105                _peek = "" if _end else self.sql[_current]
1106
1107            self._col = _col
1108            self._current = _current
1109            self._end = _end
1110            self._peek = _peek
1111            self._char = self.sql[_current - 1]
1112
1113    @property
1114    def _text(self) -> str:
1115        return self.sql[self._start : self._current]
1116
1117    def _add(self, token_type: TokenType, text: t.Optional[str] = None) -> None:
1118        self._prev_token_line = self._line
1119
1120        if self._comments and token_type == TokenType.SEMICOLON and self.tokens:
1121            self.tokens[-1].comments.extend(self._comments)
1122            self._comments = []
1123
1124        self.tokens.append(
1125            Token(
1126                token_type,
1127                text=self._text if text is None else text,
1128                line=self._line,
1129                col=self._col,
1130                start=self._start,
1131                end=self._current - 1,
1132                comments=self._comments,
1133            )
1134        )
1135        self._comments = []
1136
1137        # If we have either a semicolon or a begin token before the command's token, we'll parse
1138        # whatever follows the command's token as a string
1139        if (
1140            token_type in self.COMMANDS
1141            and self._peek != ";"
1142            and (len(self.tokens) == 1 or self.tokens[-2].token_type in self.COMMAND_PREFIX_TOKENS)
1143        ):
1144            start = self._current
1145            tokens = len(self.tokens)
1146            self._scan(lambda: self._peek == ";")
1147            self.tokens = self.tokens[:tokens]
1148            text = self.sql[start : self._current].strip()
1149            if text:
1150                self._add(TokenType.STRING, text)
1151
1152    def _scan_keywords(self) -> None:
1153        size = 0
1154        word = None
1155        chars = self._text
1156        char = chars
1157        prev_space = False
1158        skip = False
1159        trie = self._KEYWORD_TRIE
1160        single_token = char in self.SINGLE_TOKENS
1161
1162        while chars:
1163            if skip:
1164                result = TrieResult.PREFIX
1165            else:
1166                result, trie = in_trie(trie, char.upper())
1167
1168            if result == TrieResult.FAILED:
1169                break
1170            if result == TrieResult.EXISTS:
1171                word = chars
1172
1173            end = self._current + size
1174            size += 1
1175
1176            if end < self.size:
1177                char = self.sql[end]
1178                single_token = single_token or char in self.SINGLE_TOKENS
1179                is_space = char.isspace()
1180
1181                if not is_space or not prev_space:
1182                    if is_space:
1183                        char = " "
1184                    chars += char
1185                    prev_space = is_space
1186                    skip = False
1187                else:
1188                    skip = True
1189            else:
1190                char = ""
1191                break
1192
1193        if word:
1194            if self._scan_string(word):
1195                return
1196            if self._scan_comment(word):
1197                return
1198            if prev_space or single_token or not char:
1199                self._advance(size - 1)
1200                word = word.upper()
1201                self._add(self.KEYWORDS[word], text=word)
1202                return
1203
1204        if self._char in self.SINGLE_TOKENS:
1205            self._add(self.SINGLE_TOKENS[self._char], text=self._char)
1206            return
1207
1208        self._scan_var()
1209
1210    def _scan_comment(self, comment_start: str) -> bool:
1211        if comment_start not in self._COMMENTS:
1212            return False
1213
1214        comment_start_line = self._line
1215        comment_start_size = len(comment_start)
1216        comment_end = self._COMMENTS[comment_start]
1217
1218        if comment_end:
1219            # Skip the comment's start delimiter
1220            self._advance(comment_start_size)
1221
1222            comment_count = 1
1223            comment_end_size = len(comment_end)
1224
1225            while not self._end:
1226                if self._chars(comment_end_size) == comment_end:
1227                    comment_count -= 1
1228                    if not comment_count:
1229                        break
1230
1231                self._advance(alnum=True)
1232
1233                # Nested comments are allowed by some dialects, e.g. databricks, duckdb, postgres
1234                if (
1235                    self.NESTED_COMMENTS
1236                    and not self._end
1237                    and self._chars(comment_end_size) == comment_start
1238                ):
1239                    self._advance(comment_start_size)
1240                    comment_count += 1
1241
1242            self._comments.append(self._text[comment_start_size : -comment_end_size + 1])
1243            self._advance(comment_end_size - 1)
1244        else:
1245            while not self._end and self.WHITE_SPACE.get(self._peek) is not TokenType.BREAK:
1246                self._advance(alnum=True)
1247            self._comments.append(self._text[comment_start_size:])
1248
1249        if (
1250            comment_start == self.HINT_START
1251            and self.tokens
1252            and self.tokens[-1].token_type in self.TOKENS_PRECEDING_HINT
1253        ):
1254            self._add(TokenType.HINT)
1255
1256        # Leading comment is attached to the succeeding token, whilst trailing comment to the preceding.
1257        # Multiple consecutive comments are preserved by appending them to the current comments list.
1258        if comment_start_line == self._prev_token_line:
1259            self.tokens[-1].comments.extend(self._comments)
1260            self._comments = []
1261            self._prev_token_line = self._line
1262
1263        return True
1264
1265    def _scan_number(self) -> None:
1266        if self._char == "0":
1267            peek = self._peek.upper()
1268            if peek == "B":
1269                return self._scan_bits() if self.BIT_STRINGS else self._add(TokenType.NUMBER)
1270            elif peek == "X":
1271                return self._scan_hex() if self.HEX_STRINGS else self._add(TokenType.NUMBER)
1272
1273        decimal = False
1274        scientific = 0
1275
1276        while True:
1277            if self._peek.isdigit():
1278                self._advance()
1279            elif self._peek == "." and not decimal:
1280                if self.tokens and self.tokens[-1].token_type == TokenType.PARAMETER:
1281                    return self._add(TokenType.NUMBER)
1282                decimal = True
1283                self._advance()
1284            elif self._peek in ("-", "+") and scientific == 1:
1285                scientific += 1
1286                self._advance()
1287            elif self._peek.upper() == "E" and not scientific:
1288                scientific += 1
1289                self._advance()
1290            elif self._peek.isidentifier():
1291                number_text = self._text
1292                literal = ""
1293
1294                while self._peek.strip() and self._peek not in self.SINGLE_TOKENS:
1295                    literal += self._peek
1296                    self._advance()
1297
1298                token_type = self.KEYWORDS.get(self.NUMERIC_LITERALS.get(literal.upper(), ""))
1299
1300                if token_type:
1301                    self._add(TokenType.NUMBER, number_text)
1302                    self._add(TokenType.DCOLON, "::")
1303                    return self._add(token_type, literal)
1304                elif self.dialect.IDENTIFIERS_CAN_START_WITH_DIGIT:
1305                    return self._add(TokenType.VAR)
1306
1307                self._advance(-len(literal))
1308                return self._add(TokenType.NUMBER, number_text)
1309            else:
1310                return self._add(TokenType.NUMBER)
1311
1312    def _scan_bits(self) -> None:
1313        self._advance()
1314        value = self._extract_value()
1315        try:
1316            # If `value` can't be converted to a binary, fallback to tokenizing it as an identifier
1317            int(value, 2)
1318            self._add(TokenType.BIT_STRING, value[2:])  # Drop the 0b
1319        except ValueError:
1320            self._add(TokenType.IDENTIFIER)
1321
1322    def _scan_hex(self) -> None:
1323        self._advance()
1324        value = self._extract_value()
1325        try:
1326            # If `value` can't be converted to a hex, fallback to tokenizing it as an identifier
1327            int(value, 16)
1328            self._add(TokenType.HEX_STRING, value[2:])  # Drop the 0x
1329        except ValueError:
1330            self._add(TokenType.IDENTIFIER)
1331
1332    def _extract_value(self) -> str:
1333        while True:
1334            char = self._peek.strip()
1335            if char and char not in self.SINGLE_TOKENS:
1336                self._advance(alnum=True)
1337            else:
1338                break
1339
1340        return self._text
1341
1342    def _scan_string(self, start: str) -> bool:
1343        base = None
1344        token_type = TokenType.STRING
1345
1346        if start in self._QUOTES:
1347            end = self._QUOTES[start]
1348        elif start in self._FORMAT_STRINGS:
1349            end, token_type = self._FORMAT_STRINGS[start]
1350
1351            if token_type == TokenType.HEX_STRING:
1352                base = 16
1353            elif token_type == TokenType.BIT_STRING:
1354                base = 2
1355            elif token_type == TokenType.HEREDOC_STRING:
1356                self._advance()
1357
1358                if self._char == end:
1359                    tag = ""
1360                else:
1361                    tag = self._extract_string(
1362                        end,
1363                        raw_string=True,
1364                        raise_unmatched=not self.HEREDOC_TAG_IS_IDENTIFIER,
1365                    )
1366
1367                if tag and self.HEREDOC_TAG_IS_IDENTIFIER and (self._end or not tag.isidentifier()):
1368                    if not self._end:
1369                        self._advance(-1)
1370
1371                    self._advance(-len(tag))
1372                    self._add(self.HEREDOC_STRING_ALTERNATIVE)
1373                    return True
1374
1375                end = f"{start}{tag}{end}"
1376        else:
1377            return False
1378
1379        self._advance(len(start))
1380        text = self._extract_string(end, raw_string=token_type == TokenType.RAW_STRING)
1381
1382        if base:
1383            try:
1384                int(text, base)
1385            except Exception:
1386                raise TokenError(
1387                    f"Numeric string contains invalid characters from {self._line}:{self._start}"
1388                )
1389
1390        self._add(token_type, text)
1391        return True
1392
1393    def _scan_identifier(self, identifier_end: str) -> None:
1394        self._advance()
1395        text = self._extract_string(
1396            identifier_end, escapes=self._IDENTIFIER_ESCAPES | {identifier_end}
1397        )
1398        self._add(TokenType.IDENTIFIER, text)
1399
1400    def _scan_var(self) -> None:
1401        while True:
1402            char = self._peek.strip()
1403            if char and (char in self.VAR_SINGLE_TOKENS or char not in self.SINGLE_TOKENS):
1404                self._advance(alnum=True)
1405            else:
1406                break
1407
1408        self._add(
1409            TokenType.VAR
1410            if self.tokens and self.tokens[-1].token_type == TokenType.PARAMETER
1411            else self.KEYWORDS.get(self._text.upper(), TokenType.VAR)
1412        )
1413
1414    def _extract_string(
1415        self,
1416        delimiter: str,
1417        escapes: t.Optional[t.Set[str]] = None,
1418        raw_string: bool = False,
1419        raise_unmatched: bool = True,
1420    ) -> str:
1421        text = ""
1422        delim_size = len(delimiter)
1423        escapes = self._STRING_ESCAPES if escapes is None else escapes
1424
1425        while True:
1426            if (
1427                not raw_string
1428                and self.dialect.UNESCAPED_SEQUENCES
1429                and self._peek
1430                and self._char in self.STRING_ESCAPES
1431            ):
1432                unescaped_sequence = self.dialect.UNESCAPED_SEQUENCES.get(self._char + self._peek)
1433                if unescaped_sequence:
1434                    self._advance(2)
1435                    text += unescaped_sequence
1436                    continue
1437            if (
1438                (self.STRING_ESCAPES_ALLOWED_IN_RAW_STRINGS or not raw_string)
1439                and self._char in escapes
1440                and (self._peek == delimiter or self._peek in escapes)
1441                and (self._char not in self._QUOTES or self._char == self._peek)
1442            ):
1443                if self._peek == delimiter:
1444                    text += self._peek
1445                else:
1446                    text += self._char + self._peek
1447
1448                if self._current + 1 < self.size:
1449                    self._advance(2)
1450                else:
1451                    raise TokenError(f"Missing {delimiter} from {self._line}:{self._current}")
1452            else:
1453                if self._chars(delim_size) == delimiter:
1454                    if delim_size > 1:
1455                        self._advance(delim_size - 1)
1456                    break
1457
1458                if self._end:
1459                    if not raise_unmatched:
1460                        return text + self._char
1461
1462                    raise TokenError(f"Missing {delimiter} from {self._line}:{self._start}")
1463
1464                current = self._current - 1
1465                self._advance(alnum=True)
1466                text += self.sql[current : self._current - 1]
1467
1468        return text
1469
1470    def tokenize_rs(self, sql: str) -> t.List[Token]:
1471        if not self._RS_TOKENIZER:
1472            raise SqlglotError("Rust tokenizer is not available")
1473
1474        try:
1475            tokens = self._RS_TOKENIZER.tokenize(sql, self._rs_dialect_settings)
1476            for token in tokens:
1477                token.token_type = _ALL_TOKEN_TYPES[token.token_type_index]
1478            return tokens
1479        except Exception as e:
1480            raise TokenError(str(e))
Tokenizer( dialect: Union[str, sqlglot.dialects.dialect.Dialect, Type[sqlglot.dialects.dialect.Dialect], NoneType] = None)
 992    def __init__(self, dialect: DialectType = None) -> None:
 993        from sqlglot.dialects import Dialect
 994
 995        self.dialect = Dialect.get_or_raise(dialect)
 996
 997        if USE_RS_TOKENIZER:
 998            self._rs_dialect_settings = RsTokenizerDialectSettings(
 999                unescaped_sequences=self.dialect.UNESCAPED_SEQUENCES,
1000                identifiers_can_start_with_digit=self.dialect.IDENTIFIERS_CAN_START_WITH_DIGIT,
1001            )
1002
1003        self.reset()
SINGLE_TOKENS = {'(': <TokenType.L_PAREN: 'L_PAREN'>, ')': <TokenType.R_PAREN: 'R_PAREN'>, '[': <TokenType.L_BRACKET: 'L_BRACKET'>, ']': <TokenType.R_BRACKET: 'R_BRACKET'>, '{': <TokenType.L_BRACE: 'L_BRACE'>, '}': <TokenType.R_BRACE: 'R_BRACE'>, '&': <TokenType.AMP: 'AMP'>, '^': <TokenType.CARET: 'CARET'>, ':': <TokenType.COLON: 'COLON'>, ',': <TokenType.COMMA: 'COMMA'>, '.': <TokenType.DOT: 'DOT'>, '-': <TokenType.DASH: 'DASH'>, '=': <TokenType.EQ: 'EQ'>, '>': <TokenType.GT: 'GT'>, '<': <TokenType.LT: 'LT'>, '%': <TokenType.MOD: 'MOD'>, '!': <TokenType.NOT: 'NOT'>, '|': <TokenType.PIPE: 'PIPE'>, '+': <TokenType.PLUS: 'PLUS'>, ';': <TokenType.SEMICOLON: 'SEMICOLON'>, '/': <TokenType.SLASH: 'SLASH'>, '\\': <TokenType.BACKSLASH: 'BACKSLASH'>, '*': <TokenType.STAR: 'STAR'>, '~': <TokenType.TILDA: 'TILDA'>, '?': <TokenType.PLACEHOLDER: 'PLACEHOLDER'>, '@': <TokenType.PARAMETER: 'PARAMETER'>, '#': <TokenType.HASH: 'HASH'>, "'": <TokenType.UNKNOWN: 'UNKNOWN'>, '`': <TokenType.UNKNOWN: 'UNKNOWN'>, '"': <TokenType.UNKNOWN: 'UNKNOWN'>}
BIT_STRINGS: List[Union[str, Tuple[str, str]]] = []
BYTE_STRINGS: List[Union[str, Tuple[str, str]]] = []
HEX_STRINGS: List[Union[str, Tuple[str, str]]] = []
RAW_STRINGS: List[Union[str, Tuple[str, str]]] = []
HEREDOC_STRINGS: List[Union[str, Tuple[str, str]]] = []
UNICODE_STRINGS: List[Union[str, Tuple[str, str]]] = []
IDENTIFIERS: List[Union[str, Tuple[str, str]]] = ['"']
QUOTES: List[Union[str, Tuple[str, str]]] = ["'"]
STRING_ESCAPES = ["'"]
VAR_SINGLE_TOKENS: Set[str] = set()
IDENTIFIER_ESCAPES: List[str] = []
HEREDOC_TAG_IS_IDENTIFIER = False
HEREDOC_STRING_ALTERNATIVE = <TokenType.VAR: 'VAR'>
STRING_ESCAPES_ALLOWED_IN_RAW_STRINGS = True
NESTED_COMMENTS = True
HINT_START = '/*+'
TOKENS_PRECEDING_HINT = {<TokenType.DELETE: 'DELETE'>, <TokenType.UPDATE: 'UPDATE'>, <TokenType.INSERT: 'INSERT'>, <TokenType.SELECT: 'SELECT'>}
KEYWORDS: Dict[str, TokenType] = {'{%': <TokenType.BLOCK_START: 'BLOCK_START'>, '{%+': <TokenType.BLOCK_START: 'BLOCK_START'>, '{%-': <TokenType.BLOCK_START: 'BLOCK_START'>, '%}': <TokenType.BLOCK_END: 'BLOCK_END'>, '+%}': <TokenType.BLOCK_END: 'BLOCK_END'>, '-%}': <TokenType.BLOCK_END: 'BLOCK_END'>, '{{+': <TokenType.BLOCK_START: 'BLOCK_START'>, '{{-': <TokenType.BLOCK_START: 'BLOCK_START'>, '+}}': <TokenType.BLOCK_END: 'BLOCK_END'>, '-}}': <TokenType.BLOCK_END: 'BLOCK_END'>, '/*+': <TokenType.HINT: 'HINT'>, '==': <TokenType.EQ: 'EQ'>, '::': <TokenType.DCOLON: 'DCOLON'>, '||': <TokenType.DPIPE: 'DPIPE'>, '>=': <TokenType.GTE: 'GTE'>, '<=': <TokenType.LTE: 'LTE'>, '<>': <TokenType.NEQ: 'NEQ'>, '!=': <TokenType.NEQ: 'NEQ'>, ':=': <TokenType.COLON_EQ: 'COLON_EQ'>, '<=>': <TokenType.NULLSAFE_EQ: 'NULLSAFE_EQ'>, '->': <TokenType.ARROW: 'ARROW'>, '->>': <TokenType.DARROW: 'DARROW'>, '=>': <TokenType.FARROW: 'FARROW'>, '#>': <TokenType.HASH_ARROW: 'HASH_ARROW'>, '#>>': <TokenType.DHASH_ARROW: 'DHASH_ARROW'>, '<->': <TokenType.LR_ARROW: 'LR_ARROW'>, '&&': <TokenType.DAMP: 'DAMP'>, '??': <TokenType.DQMARK: 'DQMARK'>, '~~~': <TokenType.GLOB: 'GLOB'>, '~~': <TokenType.LIKE: 'LIKE'>, '~~*': <TokenType.ILIKE: 'ILIKE'>, '~*': <TokenType.IRLIKE: 'IRLIKE'>, 'ALL': <TokenType.ALL: 'ALL'>, 'ALWAYS': <TokenType.ALWAYS: 'ALWAYS'>, 'AND': <TokenType.AND: 'AND'>, 'ANTI': <TokenType.ANTI: 'ANTI'>, 'ANY': <TokenType.ANY: 'ANY'>, 'ASC': <TokenType.ASC: 'ASC'>, 'AS': <TokenType.ALIAS: 'ALIAS'>, 'ASOF': <TokenType.ASOF: 'ASOF'>, 'AUTOINCREMENT': <TokenType.AUTO_INCREMENT: 'AUTO_INCREMENT'>, 'AUTO_INCREMENT': <TokenType.AUTO_INCREMENT: 'AUTO_INCREMENT'>, 'BEGIN': <TokenType.BEGIN: 'BEGIN'>, 'BETWEEN': <TokenType.BETWEEN: 'BETWEEN'>, 'CACHE': <TokenType.CACHE: 'CACHE'>, 'UNCACHE': <TokenType.UNCACHE: 'UNCACHE'>, 'CASE': <TokenType.CASE: 'CASE'>, 'CHARACTER SET': <TokenType.CHARACTER_SET: 'CHARACTER_SET'>, 'CLUSTER BY': <TokenType.CLUSTER_BY: 'CLUSTER_BY'>, 'COLLATE': <TokenType.COLLATE: 'COLLATE'>, 'COLUMN': <TokenType.COLUMN: 'COLUMN'>, 'COMMIT': <TokenType.COMMIT: 'COMMIT'>, 'CONNECT BY': <TokenType.CONNECT_BY: 'CONNECT_BY'>, 'CONSTRAINT': <TokenType.CONSTRAINT: 'CONSTRAINT'>, 'COPY': <TokenType.COPY: 'COPY'>, 'CREATE': <TokenType.CREATE: 'CREATE'>, 'CROSS': <TokenType.CROSS: 'CROSS'>, 'CUBE': <TokenType.CUBE: 'CUBE'>, 'CURRENT_DATE': <TokenType.CURRENT_DATE: 'CURRENT_DATE'>, 'CURRENT_TIME': <TokenType.CURRENT_TIME: 'CURRENT_TIME'>, 'CURRENT_TIMESTAMP': <TokenType.CURRENT_TIMESTAMP: 'CURRENT_TIMESTAMP'>, 'CURRENT_USER': <TokenType.CURRENT_USER: 'CURRENT_USER'>, 'DATABASE': <TokenType.DATABASE: 'DATABASE'>, 'DEFAULT': <TokenType.DEFAULT: 'DEFAULT'>, 'DELETE': <TokenType.DELETE: 'DELETE'>, 'DESC': <TokenType.DESC: 'DESC'>, 'DESCRIBE': <TokenType.DESCRIBE: 'DESCRIBE'>, 'DISTINCT': <TokenType.DISTINCT: 'DISTINCT'>, 'DISTRIBUTE BY': <TokenType.DISTRIBUTE_BY: 'DISTRIBUTE_BY'>, 'DIV': <TokenType.DIV: 'DIV'>, 'DROP': <TokenType.DROP: 'DROP'>, 'ELSE': <TokenType.ELSE: 'ELSE'>, 'END': <TokenType.END: 'END'>, 'ENUM': <TokenType.ENUM: 'ENUM'>, 'ESCAPE': <TokenType.ESCAPE: 'ESCAPE'>, 'EXCEPT': <TokenType.EXCEPT: 'EXCEPT'>, 'EXECUTE': <TokenType.EXECUTE: 'EXECUTE'>, 'EXISTS': <TokenType.EXISTS: 'EXISTS'>, 'FALSE': <TokenType.FALSE: 'FALSE'>, 'FETCH': <TokenType.FETCH: 'FETCH'>, 'FILTER': <TokenType.FILTER: 'FILTER'>, 'FIRST': <TokenType.FIRST: 'FIRST'>, 'FULL': <TokenType.FULL: 'FULL'>, 'FUNCTION': <TokenType.FUNCTION: 'FUNCTION'>, 'FOR': <TokenType.FOR: 'FOR'>, 'FOREIGN KEY': <TokenType.FOREIGN_KEY: 'FOREIGN_KEY'>, 'FORMAT': <TokenType.FORMAT: 'FORMAT'>, 'FROM': <TokenType.FROM: 'FROM'>, 'GEOGRAPHY': <TokenType.GEOGRAPHY: 'GEOGRAPHY'>, 'GEOMETRY': <TokenType.GEOMETRY: 'GEOMETRY'>, 'GLOB': <TokenType.GLOB: 'GLOB'>, 'GROUP BY': <TokenType.GROUP_BY: 'GROUP_BY'>, 'GROUPING SETS': <TokenType.GROUPING_SETS: 'GROUPING_SETS'>, 'HAVING': <TokenType.HAVING: 'HAVING'>, 'ILIKE': <TokenType.ILIKE: 'ILIKE'>, 'IN': <TokenType.IN: 'IN'>, 'INDEX': <TokenType.INDEX: 'INDEX'>, 'INET': <TokenType.INET: 'INET'>, 'INNER': <TokenType.INNER: 'INNER'>, 'INSERT': <TokenType.INSERT: 'INSERT'>, 'INTERVAL': <TokenType.INTERVAL: 'INTERVAL'>, 'INTERSECT': <TokenType.INTERSECT: 'INTERSECT'>, 'INTO': <TokenType.INTO: 'INTO'>, 'IS': <TokenType.IS: 'IS'>, 'ISNULL': <TokenType.ISNULL: 'ISNULL'>, 'JOIN': <TokenType.JOIN: 'JOIN'>, 'KEEP': <TokenType.KEEP: 'KEEP'>, 'KILL': <TokenType.KILL: 'KILL'>, 'LATERAL': <TokenType.LATERAL: 'LATERAL'>, 'LEFT': <TokenType.LEFT: 'LEFT'>, 'LIKE': <TokenType.LIKE: 'LIKE'>, 'LIMIT': <TokenType.LIMIT: 'LIMIT'>, 'LOAD': <TokenType.LOAD: 'LOAD'>, 'LOCK': <TokenType.LOCK: 'LOCK'>, 'MERGE': <TokenType.MERGE: 'MERGE'>, 'NATURAL': <TokenType.NATURAL: 'NATURAL'>, 'NEXT': <TokenType.NEXT: 'NEXT'>, 'NOT': <TokenType.NOT: 'NOT'>, 'NOTNULL': <TokenType.NOTNULL: 'NOTNULL'>, 'NULL': <TokenType.NULL: 'NULL'>, 'OBJECT': <TokenType.OBJECT: 'OBJECT'>, 'OFFSET': <TokenType.OFFSET: 'OFFSET'>, 'ON': <TokenType.ON: 'ON'>, 'OR': <TokenType.OR: 'OR'>, 'XOR': <TokenType.XOR: 'XOR'>, 'ORDER BY': <TokenType.ORDER_BY: 'ORDER_BY'>, 'ORDINALITY': <TokenType.ORDINALITY: 'ORDINALITY'>, 'OUTER': <TokenType.OUTER: 'OUTER'>, 'OVER': <TokenType.OVER: 'OVER'>, 'OVERLAPS': <TokenType.OVERLAPS: 'OVERLAPS'>, 'OVERWRITE': <TokenType.OVERWRITE: 'OVERWRITE'>, 'PARTITION': <TokenType.PARTITION: 'PARTITION'>, 'PARTITION BY': <TokenType.PARTITION_BY: 'PARTITION_BY'>, 'PARTITIONED BY': <TokenType.PARTITION_BY: 'PARTITION_BY'>, 'PARTITIONED_BY': <TokenType.PARTITION_BY: 'PARTITION_BY'>, 'PERCENT': <TokenType.PERCENT: 'PERCENT'>, 'PIVOT': <TokenType.PIVOT: 'PIVOT'>, 'PRAGMA': <TokenType.PRAGMA: 'PRAGMA'>, 'PRIMARY KEY': <TokenType.PRIMARY_KEY: 'PRIMARY_KEY'>, 'PROCEDURE': <TokenType.PROCEDURE: 'PROCEDURE'>, 'QUALIFY': <TokenType.QUALIFY: 'QUALIFY'>, 'RANGE': <TokenType.RANGE: 'RANGE'>, 'RECURSIVE': <TokenType.RECURSIVE: 'RECURSIVE'>, 'REGEXP': <TokenType.RLIKE: 'RLIKE'>, 'RENAME': <TokenType.RENAME: 'RENAME'>, 'REPLACE': <TokenType.REPLACE: 'REPLACE'>, 'RETURNING': <TokenType.RETURNING: 'RETURNING'>, 'REFERENCES': <TokenType.REFERENCES: 'REFERENCES'>, 'RIGHT': <TokenType.RIGHT: 'RIGHT'>, 'RLIKE': <TokenType.RLIKE: 'RLIKE'>, 'ROLLBACK': <TokenType.ROLLBACK: 'ROLLBACK'>, 'ROLLUP': <TokenType.ROLLUP: 'ROLLUP'>, 'ROW': <TokenType.ROW: 'ROW'>, 'ROWS': <TokenType.ROWS: 'ROWS'>, 'SCHEMA': <TokenType.SCHEMA: 'SCHEMA'>, 'SELECT': <TokenType.SELECT: 'SELECT'>, 'SEMI': <TokenType.SEMI: 'SEMI'>, 'SET': <TokenType.SET: 'SET'>, 'SETTINGS': <TokenType.SETTINGS: 'SETTINGS'>, 'SHOW': <TokenType.SHOW: 'SHOW'>, 'SIMILAR TO': <TokenType.SIMILAR_TO: 'SIMILAR_TO'>, 'SOME': <TokenType.SOME: 'SOME'>, 'SORT BY': <TokenType.SORT_BY: 'SORT_BY'>, 'START WITH': <TokenType.START_WITH: 'START_WITH'>, 'STRAIGHT_JOIN': <TokenType.STRAIGHT_JOIN: 'STRAIGHT_JOIN'>, 'TABLE': <TokenType.TABLE: 'TABLE'>, 'TABLESAMPLE': <TokenType.TABLE_SAMPLE: 'TABLE_SAMPLE'>, 'TEMP': <TokenType.TEMPORARY: 'TEMPORARY'>, 'TEMPORARY': <TokenType.TEMPORARY: 'TEMPORARY'>, 'THEN': <TokenType.THEN: 'THEN'>, 'TRUE': <TokenType.TRUE: 'TRUE'>, 'TRUNCATE': <TokenType.TRUNCATE: 'TRUNCATE'>, 'UNION': <TokenType.UNION: 'UNION'>, 'UNKNOWN': <TokenType.UNKNOWN: 'UNKNOWN'>, 'UNNEST': <TokenType.UNNEST: 'UNNEST'>, 'UNPIVOT': <TokenType.UNPIVOT: 'UNPIVOT'>, 'UPDATE': <TokenType.UPDATE: 'UPDATE'>, 'USE': <TokenType.USE: 'USE'>, 'USING': <TokenType.USING: 'USING'>, 'UUID': <TokenType.UUID: 'UUID'>, 'VALUES': <TokenType.VALUES: 'VALUES'>, 'VIEW': <TokenType.VIEW: 'VIEW'>, 'VOLATILE': <TokenType.VOLATILE: 'VOLATILE'>, 'WHEN': <TokenType.WHEN: 'WHEN'>, 'WHERE': <TokenType.WHERE: 'WHERE'>, 'WINDOW': <TokenType.WINDOW: 'WINDOW'>, 'WITH': <TokenType.WITH: 'WITH'>, 'APPLY': <TokenType.APPLY: 'APPLY'>, 'ARRAY': <TokenType.ARRAY: 'ARRAY'>, 'BIT': <TokenType.BIT: 'BIT'>, 'BOOL': <TokenType.BOOLEAN: 'BOOLEAN'>, 'BOOLEAN': <TokenType.BOOLEAN: 'BOOLEAN'>, 'BYTE': <TokenType.TINYINT: 'TINYINT'>, 'MEDIUMINT': <TokenType.MEDIUMINT: 'MEDIUMINT'>, 'INT1': <TokenType.TINYINT: 'TINYINT'>, 'TINYINT': <TokenType.TINYINT: 'TINYINT'>, 'INT16': <TokenType.SMALLINT: 'SMALLINT'>, 'SHORT': <TokenType.SMALLINT: 'SMALLINT'>, 'SMALLINT': <TokenType.SMALLINT: 'SMALLINT'>, 'INT128': <TokenType.INT128: 'INT128'>, 'HUGEINT': <TokenType.INT128: 'INT128'>, 'UHUGEINT': <TokenType.UINT128: 'UINT128'>, 'INT2': <TokenType.SMALLINT: 'SMALLINT'>, 'INTEGER': <TokenType.INT: 'INT'>, 'INT': <TokenType.INT: 'INT'>, 'INT4': <TokenType.INT: 'INT'>, 'INT32': <TokenType.INT: 'INT'>, 'INT64': <TokenType.BIGINT: 'BIGINT'>, 'LONG': <TokenType.BIGINT: 'BIGINT'>, 'BIGINT': <TokenType.BIGINT: 'BIGINT'>, 'INT8': <TokenType.TINYINT: 'TINYINT'>, 'UINT': <TokenType.UINT: 'UINT'>, 'DEC': <TokenType.DECIMAL: 'DECIMAL'>, 'DECIMAL': <TokenType.DECIMAL: 'DECIMAL'>, 'DECIMAL32': <TokenType.DECIMAL32: 'DECIMAL32'>, 'DECIMAL64': <TokenType.DECIMAL64: 'DECIMAL64'>, 'DECIMAL128': <TokenType.DECIMAL128: 'DECIMAL128'>, 'DECIMAL256': <TokenType.DECIMAL256: 'DECIMAL256'>, 'BIGDECIMAL': <TokenType.BIGDECIMAL: 'BIGDECIMAL'>, 'BIGNUMERIC': <TokenType.BIGDECIMAL: 'BIGDECIMAL'>, 'LIST': <TokenType.LIST: 'LIST'>, 'MAP': <TokenType.MAP: 'MAP'>, 'NULLABLE': <TokenType.NULLABLE: 'NULLABLE'>, 'NUMBER': <TokenType.DECIMAL: 'DECIMAL'>, 'NUMERIC': <TokenType.DECIMAL: 'DECIMAL'>, 'FIXED': <TokenType.DECIMAL: 'DECIMAL'>, 'REAL': <TokenType.FLOAT: 'FLOAT'>, 'FLOAT': <TokenType.FLOAT: 'FLOAT'>, 'FLOAT4': <TokenType.FLOAT: 'FLOAT'>, 'FLOAT8': <TokenType.DOUBLE: 'DOUBLE'>, 'DOUBLE': <TokenType.DOUBLE: 'DOUBLE'>, 'DOUBLE PRECISION': <TokenType.DOUBLE: 'DOUBLE'>, 'JSON': <TokenType.JSON: 'JSON'>, 'JSONB': <TokenType.JSONB: 'JSONB'>, 'CHAR': <TokenType.CHAR: 'CHAR'>, 'CHARACTER': <TokenType.CHAR: 'CHAR'>, 'NCHAR': <TokenType.NCHAR: 'NCHAR'>, 'VARCHAR': <TokenType.VARCHAR: 'VARCHAR'>, 'VARCHAR2': <TokenType.VARCHAR: 'VARCHAR'>, 'NVARCHAR': <TokenType.NVARCHAR: 'NVARCHAR'>, 'NVARCHAR2': <TokenType.NVARCHAR: 'NVARCHAR'>, 'BPCHAR': <TokenType.BPCHAR: 'BPCHAR'>, 'STR': <TokenType.TEXT: 'TEXT'>, 'STRING': <TokenType.TEXT: 'TEXT'>, 'TEXT': <TokenType.TEXT: 'TEXT'>, 'LONGTEXT': <TokenType.LONGTEXT: 'LONGTEXT'>, 'MEDIUMTEXT': <TokenType.MEDIUMTEXT: 'MEDIUMTEXT'>, 'TINYTEXT': <TokenType.TINYTEXT: 'TINYTEXT'>, 'CLOB': <TokenType.TEXT: 'TEXT'>, 'LONGVARCHAR': <TokenType.TEXT: 'TEXT'>, 'BINARY': <TokenType.BINARY: 'BINARY'>, 'BLOB': <TokenType.VARBINARY: 'VARBINARY'>, 'LONGBLOB': <TokenType.LONGBLOB: 'LONGBLOB'>, 'MEDIUMBLOB': <TokenType.MEDIUMBLOB: 'MEDIUMBLOB'>, 'TINYBLOB': <TokenType.TINYBLOB: 'TINYBLOB'>, 'BYTEA': <TokenType.VARBINARY: 'VARBINARY'>, 'VARBINARY': <TokenType.VARBINARY: 'VARBINARY'>, 'TIME': <TokenType.TIME: 'TIME'>, 'TIMETZ': <TokenType.TIMETZ: 'TIMETZ'>, 'TIMESTAMP': <TokenType.TIMESTAMP: 'TIMESTAMP'>, 'TIMESTAMPTZ': <TokenType.TIMESTAMPTZ: 'TIMESTAMPTZ'>, 'TIMESTAMPLTZ': <TokenType.TIMESTAMPLTZ: 'TIMESTAMPLTZ'>, 'TIMESTAMP_LTZ': <TokenType.TIMESTAMPLTZ: 'TIMESTAMPLTZ'>, 'TIMESTAMPNTZ': <TokenType.TIMESTAMPNTZ: 'TIMESTAMPNTZ'>, 'TIMESTAMP_NTZ': <TokenType.TIMESTAMPNTZ: 'TIMESTAMPNTZ'>, 'DATE': <TokenType.DATE: 'DATE'>, 'DATETIME': <TokenType.DATETIME: 'DATETIME'>, 'INT4RANGE': <TokenType.INT4RANGE: 'INT4RANGE'>, 'INT4MULTIRANGE': <TokenType.INT4MULTIRANGE: 'INT4MULTIRANGE'>, 'INT8RANGE': <TokenType.INT8RANGE: 'INT8RANGE'>, 'INT8MULTIRANGE': <TokenType.INT8MULTIRANGE: 'INT8MULTIRANGE'>, 'NUMRANGE': <TokenType.NUMRANGE: 'NUMRANGE'>, 'NUMMULTIRANGE': <TokenType.NUMMULTIRANGE: 'NUMMULTIRANGE'>, 'TSRANGE': <TokenType.TSRANGE: 'TSRANGE'>, 'TSMULTIRANGE': <TokenType.TSMULTIRANGE: 'TSMULTIRANGE'>, 'TSTZRANGE': <TokenType.TSTZRANGE: 'TSTZRANGE'>, 'TSTZMULTIRANGE': <TokenType.TSTZMULTIRANGE: 'TSTZMULTIRANGE'>, 'DATERANGE': <TokenType.DATERANGE: 'DATERANGE'>, 'DATEMULTIRANGE': <TokenType.DATEMULTIRANGE: 'DATEMULTIRANGE'>, 'UNIQUE': <TokenType.UNIQUE: 'UNIQUE'>, 'VECTOR': <TokenType.VECTOR: 'VECTOR'>, 'STRUCT': <TokenType.STRUCT: 'STRUCT'>, 'SEQUENCE': <TokenType.SEQUENCE: 'SEQUENCE'>, 'VARIANT': <TokenType.VARIANT: 'VARIANT'>, 'ALTER': <TokenType.ALTER: 'ALTER'>, 'ANALYZE': <TokenType.COMMAND: 'COMMAND'>, 'CALL': <TokenType.COMMAND: 'COMMAND'>, 'COMMENT': <TokenType.COMMENT: 'COMMENT'>, 'EXPLAIN': <TokenType.COMMAND: 'COMMAND'>, 'GRANT': <TokenType.GRANT: 'GRANT'>, 'OPTIMIZE': <TokenType.COMMAND: 'COMMAND'>, 'PREPARE': <TokenType.COMMAND: 'COMMAND'>, 'VACUUM': <TokenType.COMMAND: 'COMMAND'>, 'USER-DEFINED': <TokenType.USERDEFINED: 'USERDEFINED'>, 'FOR VERSION': <TokenType.VERSION_SNAPSHOT: 'VERSION_SNAPSHOT'>, 'FOR TIMESTAMP': <TokenType.TIMESTAMP_SNAPSHOT: 'TIMESTAMP_SNAPSHOT'>}
WHITE_SPACE: Dict[Optional[str], TokenType] = {' ': <TokenType.SPACE: 'SPACE'>, '\t': <TokenType.SPACE: 'SPACE'>, '\n': <TokenType.BREAK: 'BREAK'>, '\r': <TokenType.BREAK: 'BREAK'>}
COMMANDS = {<TokenType.EXECUTE: 'EXECUTE'>, <TokenType.COMMAND: 'COMMAND'>, <TokenType.FETCH: 'FETCH'>, <TokenType.RENAME: 'RENAME'>, <TokenType.SHOW: 'SHOW'>}
COMMAND_PREFIX_TOKENS = {<TokenType.SEMICOLON: 'SEMICOLON'>, <TokenType.BEGIN: 'BEGIN'>}
NUMERIC_LITERALS: Dict[str, str] = {}
COMMENTS = ['--', ('/*', '*/')]
dialect
def reset(self) -> None:
1005    def reset(self) -> None:
1006        self.sql = ""
1007        self.size = 0
1008        self.tokens: t.List[Token] = []
1009        self._start = 0
1010        self._current = 0
1011        self._line = 1
1012        self._col = 0
1013        self._comments: t.List[str] = []
1014
1015        self._char = ""
1016        self._end = False
1017        self._peek = ""
1018        self._prev_token_line = -1
def tokenize(self, sql: str) -> List[Token]:
1020    def tokenize(self, sql: str) -> t.List[Token]:
1021        """Returns a list of tokens corresponding to the SQL string `sql`."""
1022        if USE_RS_TOKENIZER:
1023            return self.tokenize_rs(sql)
1024
1025        self.reset()
1026        self.sql = sql
1027        self.size = len(sql)
1028
1029        try:
1030            self._scan()
1031        except Exception as e:
1032            start = max(self._current - 50, 0)
1033            end = min(self._current + 50, self.size - 1)
1034            context = self.sql[start:end]
1035            raise TokenError(f"Error tokenizing '{context}'") from e
1036
1037        return self.tokens

Returns a list of tokens corresponding to the SQL string sql.

def tokenize_rs(self, sql: str) -> List[Token]:
1470    def tokenize_rs(self, sql: str) -> t.List[Token]:
1471        if not self._RS_TOKENIZER:
1472            raise SqlglotError("Rust tokenizer is not available")
1473
1474        try:
1475            tokens = self._RS_TOKENIZER.tokenize(sql, self._rs_dialect_settings)
1476            for token in tokens:
1477                token.token_type = _ALL_TOKEN_TYPES[token.token_type_index]
1478            return tokens
1479        except Exception as e:
1480            raise TokenError(str(e))
size
sql
tokens