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