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09bed9a9f5
unescape_quote() assumed that a QUOTED token wouldn't end in the middle of an escape sequence, but that assumption could fail (a bug found by the fuzzer).
148 lines
4.1 KiB
Python
148 lines
4.1 KiB
Python
# tokenizer.py
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#
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# Copyright 2021 James Westman <james@jwestman.net>
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#
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# This file is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as
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# published by the Free Software Foundation; either version 3 of the
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# License, or (at your option) any later version.
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#
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# This file is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# SPDX-License-Identifier: LGPL-3.0-or-later
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import re
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import typing as T
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from dataclasses import dataclass
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from enum import Enum
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from . import utils
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class TokenType(Enum):
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EOF = 0
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IDENT = 1
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QUOTED = 2
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NUMBER = 3
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OP = 4
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WHITESPACE = 5
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COMMENT = 6
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PUNCTUATION = 7
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_tokens = [
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(TokenType.IDENT, r"[A-Za-z_][\d\w\-_]*"),
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(TokenType.QUOTED, r'"(\\.|[^\\"\n])*"'),
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(TokenType.QUOTED, r"'(\\.|[^\\'\n])*'"),
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(TokenType.NUMBER, r"0x[A-Za-z0-9_]+"),
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(TokenType.NUMBER, r"[\d_]+(\.[\d_]+)?"),
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(TokenType.NUMBER, r"\.[\d_]+"),
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(TokenType.WHITESPACE, r"\s+"),
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(TokenType.COMMENT, r"\/\*[\s\S]*?\*\/"),
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(TokenType.COMMENT, r"\/\/[^\n]*"),
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(TokenType.OP, r"\$|<<|>>|=>|::|<|>|:=|\.|\|\||\||\+|\-|\*|=|:|/"),
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(TokenType.PUNCTUATION, r"\(|\)|\{|\}|;|\[|\]|\,"),
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]
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_TOKENS = [(type, re.compile(regex)) for (type, regex) in _tokens]
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class Token:
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def __init__(self, type: TokenType, start: int, end: int, string: str):
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self.type = type
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self.start = start
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self.end = end
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self.string = string
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def __str__(self) -> str:
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return self.string[self.start : self.end]
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@property
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def range(self) -> "Range":
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return Range(self.start, self.end, self.string)
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def get_number(self) -> T.Union[int, float]:
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from .errors import CompileError, CompilerBugError
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if self.type != TokenType.NUMBER:
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raise CompilerBugError()
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string = str(self).replace("_", "")
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try:
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if string.startswith("0x"):
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return int(string, 16)
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elif "." in string:
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return float(string)
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else:
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return int(string)
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except:
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raise CompileError(f"{str(self)} is not a valid number literal", self.range)
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def _tokenize(ui_ml: str):
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from .errors import CompileError
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i = 0
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while i < len(ui_ml):
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matched = False
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for type, regex in _TOKENS:
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match = regex.match(ui_ml, i)
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if match is not None:
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yield Token(type, match.start(), match.end(), ui_ml)
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i = match.end()
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matched = True
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break
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if not matched:
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raise CompileError(
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"Could not determine what kind of syntax is meant here",
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Range(i, i, ui_ml),
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)
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yield Token(TokenType.EOF, i, i, ui_ml)
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def tokenize(data: str) -> T.List[Token]:
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return list(_tokenize(data))
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@dataclass
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class Range:
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start: int
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end: int
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original_text: str
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@property
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def length(self) -> int:
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return self.end - self.start
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@property
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def text(self) -> str:
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return self.original_text[self.start : self.end]
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@staticmethod
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def join(a: T.Optional["Range"], b: T.Optional["Range"]) -> T.Optional["Range"]:
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if a is None:
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return b
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if b is None:
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return a
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return Range(min(a.start, b.start), max(a.end, b.end), a.original_text)
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def __contains__(self, other: T.Union[int, "Range"]) -> bool:
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if isinstance(other, int):
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return self.start <= other <= self.end
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else:
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return self.start <= other.start and self.end >= other.end
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def to_json(self):
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return utils.idxs_to_range(self.start, self.end, self.original_text)
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def overlaps(self, other: "Range") -> bool:
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return not (self.end < other.start or self.start > other.end)
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