689 lines
22 KiB
Python
689 lines
22 KiB
Python
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006 Python Software Foundation.
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# All rights reserved.
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# mypy: allow-untyped-defs, allow-untyped-calls
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"""Tokenization help for Python programs.
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generate_tokens(readline) is a generator that breaks a stream of
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text into Python tokens. It accepts a readline-like method which is called
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repeatedly to get the next line of input (or "" for EOF). It generates
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5-tuples with these members:
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the token type (see token.py)
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the token (a string)
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the starting (row, column) indices of the token (a 2-tuple of ints)
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the ending (row, column) indices of the token (a 2-tuple of ints)
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the original line (string)
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It is designed to match the working of the Python tokenizer exactly, except
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that it produces COMMENT tokens for comments and gives type OP for all
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operators
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Older entry points
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tokenize_loop(readline, tokeneater)
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tokenize(readline, tokeneater=printtoken)
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are the same, except instead of generating tokens, tokeneater is a callback
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function to which the 5 fields described above are passed as 5 arguments,
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each time a new token is found."""
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import sys
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from typing import (
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Callable,
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Iterable,
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Iterator,
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List,
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Optional,
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Text,
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Tuple,
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Pattern,
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Union,
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cast,
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)
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if sys.version_info >= (3, 8):
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from typing import Final
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else:
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from typing_extensions import Final
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from blib2to3.pgen2.token import *
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from blib2to3.pgen2.grammar import Grammar
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__author__ = "Ka-Ping Yee <ping@lfw.org>"
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__credits__ = "GvR, ESR, Tim Peters, Thomas Wouters, Fred Drake, Skip Montanaro"
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import re
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from codecs import BOM_UTF8, lookup
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from blib2to3.pgen2.token import *
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from . import token
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__all__ = [x for x in dir(token) if x[0] != "_"] + [
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"tokenize",
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"generate_tokens",
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"untokenize",
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]
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del token
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def group(*choices):
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return "(" + "|".join(choices) + ")"
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def any(*choices):
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return group(*choices) + "*"
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def maybe(*choices):
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return group(*choices) + "?"
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def _combinations(*l):
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return set(x + y for x in l for y in l + ("",) if x.casefold() != y.casefold())
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Whitespace = r"[ \f\t]*"
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Comment = r"#[^\r\n]*"
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Ignore = Whitespace + any(r"\\\r?\n" + Whitespace) + maybe(Comment)
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Name = ( # this is invalid but it's fine because Name comes after Number in all groups
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r"[^\s#\(\)\[\]\{\}+\-*/!@$%^&=|;:'\",\.<>/?`~\\]+"
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)
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Binnumber = r"0[bB]_?[01]+(?:_[01]+)*"
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Hexnumber = r"0[xX]_?[\da-fA-F]+(?:_[\da-fA-F]+)*[lL]?"
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Octnumber = r"0[oO]?_?[0-7]+(?:_[0-7]+)*[lL]?"
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Decnumber = group(r"[1-9]\d*(?:_\d+)*[lL]?", "0[lL]?")
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Intnumber = group(Binnumber, Hexnumber, Octnumber, Decnumber)
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Exponent = r"[eE][-+]?\d+(?:_\d+)*"
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Pointfloat = group(r"\d+(?:_\d+)*\.(?:\d+(?:_\d+)*)?", r"\.\d+(?:_\d+)*") + maybe(
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Exponent
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)
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Expfloat = r"\d+(?:_\d+)*" + Exponent
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Floatnumber = group(Pointfloat, Expfloat)
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Imagnumber = group(r"\d+(?:_\d+)*[jJ]", Floatnumber + r"[jJ]")
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Number = group(Imagnumber, Floatnumber, Intnumber)
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# Tail end of ' string.
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Single = r"[^'\\]*(?:\\.[^'\\]*)*'"
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# Tail end of " string.
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Double = r'[^"\\]*(?:\\.[^"\\]*)*"'
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# Tail end of ''' string.
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Single3 = r"[^'\\]*(?:(?:\\.|'(?!''))[^'\\]*)*'''"
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# Tail end of """ string.
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Double3 = r'[^"\\]*(?:(?:\\.|"(?!""))[^"\\]*)*"""'
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_litprefix = r"(?:[uUrRbBfF]|[rR][fFbB]|[fFbBuU][rR])?"
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Triple = group(_litprefix + "'''", _litprefix + '"""')
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# Single-line ' or " string.
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String = group(
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_litprefix + r"'[^\n'\\]*(?:\\.[^\n'\\]*)*'",
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_litprefix + r'"[^\n"\\]*(?:\\.[^\n"\\]*)*"',
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)
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# Because of leftmost-then-longest match semantics, be sure to put the
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# longest operators first (e.g., if = came before ==, == would get
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# recognized as two instances of =).
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Operator = group(
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r"\*\*=?",
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r">>=?",
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r"<<=?",
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r"<>",
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r"!=",
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r"//=?",
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r"->",
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r"[+\-*/%&@|^=<>:]=?",
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r"~",
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)
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Bracket = "[][(){}]"
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Special = group(r"\r?\n", r"[:;.,`@]")
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Funny = group(Operator, Bracket, Special)
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# First (or only) line of ' or " string.
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ContStr = group(
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_litprefix + r"'[^\n'\\]*(?:\\.[^\n'\\]*)*" + group("'", r"\\\r?\n"),
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_litprefix + r'"[^\n"\\]*(?:\\.[^\n"\\]*)*' + group('"', r"\\\r?\n"),
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)
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PseudoExtras = group(r"\\\r?\n", Comment, Triple)
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PseudoToken = Whitespace + group(PseudoExtras, Number, Funny, ContStr, Name)
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pseudoprog: Final = re.compile(PseudoToken, re.UNICODE)
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single3prog = re.compile(Single3)
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double3prog = re.compile(Double3)
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_strprefixes = (
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_combinations("r", "R", "f", "F")
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| _combinations("r", "R", "b", "B")
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| {"u", "U", "ur", "uR", "Ur", "UR"}
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)
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endprogs: Final = {
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"'": re.compile(Single),
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'"': re.compile(Double),
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"'''": single3prog,
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'"""': double3prog,
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**{f"{prefix}'''": single3prog for prefix in _strprefixes},
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**{f'{prefix}"""': double3prog for prefix in _strprefixes},
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**{prefix: None for prefix in _strprefixes},
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}
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triple_quoted: Final = (
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{"'''", '"""'}
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| {f"{prefix}'''" for prefix in _strprefixes}
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| {f'{prefix}"""' for prefix in _strprefixes}
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)
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single_quoted: Final = (
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{"'", '"'}
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| {f"{prefix}'" for prefix in _strprefixes}
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| {f'{prefix}"' for prefix in _strprefixes}
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)
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tabsize = 8
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class TokenError(Exception):
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pass
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class StopTokenizing(Exception):
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pass
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def printtoken(type, token, xxx_todo_changeme, xxx_todo_changeme1, line): # for testing
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(srow, scol) = xxx_todo_changeme
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(erow, ecol) = xxx_todo_changeme1
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print(
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"%d,%d-%d,%d:\t%s\t%s" % (srow, scol, erow, ecol, tok_name[type], repr(token))
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)
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Coord = Tuple[int, int]
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TokenEater = Callable[[int, Text, Coord, Coord, Text], None]
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def tokenize(readline: Callable[[], Text], tokeneater: TokenEater = printtoken) -> None:
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"""
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The tokenize() function accepts two parameters: one representing the
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input stream, and one providing an output mechanism for tokenize().
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The first parameter, readline, must be a callable object which provides
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the same interface as the readline() method of built-in file objects.
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Each call to the function should return one line of input as a string.
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The second parameter, tokeneater, must also be a callable object. It is
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called once for each token, with five arguments, corresponding to the
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tuples generated by generate_tokens().
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"""
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try:
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tokenize_loop(readline, tokeneater)
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except StopTokenizing:
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pass
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# backwards compatible interface
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def tokenize_loop(readline, tokeneater):
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for token_info in generate_tokens(readline):
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tokeneater(*token_info)
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GoodTokenInfo = Tuple[int, Text, Coord, Coord, Text]
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TokenInfo = Union[Tuple[int, str], GoodTokenInfo]
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class Untokenizer:
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tokens: List[Text]
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prev_row: int
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prev_col: int
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def __init__(self) -> None:
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self.tokens = []
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self.prev_row = 1
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self.prev_col = 0
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def add_whitespace(self, start: Coord) -> None:
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row, col = start
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assert row <= self.prev_row
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col_offset = col - self.prev_col
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if col_offset:
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self.tokens.append(" " * col_offset)
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def untokenize(self, iterable: Iterable[TokenInfo]) -> Text:
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for t in iterable:
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if len(t) == 2:
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self.compat(cast(Tuple[int, str], t), iterable)
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break
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tok_type, token, start, end, line = cast(
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Tuple[int, Text, Coord, Coord, Text], t
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)
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self.add_whitespace(start)
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self.tokens.append(token)
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self.prev_row, self.prev_col = end
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if tok_type in (NEWLINE, NL):
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self.prev_row += 1
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self.prev_col = 0
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return "".join(self.tokens)
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def compat(self, token: Tuple[int, Text], iterable: Iterable[TokenInfo]) -> None:
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startline = False
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indents = []
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toks_append = self.tokens.append
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toknum, tokval = token
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if toknum in (NAME, NUMBER):
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tokval += " "
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if toknum in (NEWLINE, NL):
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startline = True
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for tok in iterable:
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toknum, tokval = tok[:2]
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if toknum in (NAME, NUMBER, ASYNC, AWAIT):
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tokval += " "
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if toknum == INDENT:
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indents.append(tokval)
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continue
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elif toknum == DEDENT:
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indents.pop()
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continue
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elif toknum in (NEWLINE, NL):
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startline = True
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elif startline and indents:
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toks_append(indents[-1])
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startline = False
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toks_append(tokval)
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cookie_re = re.compile(r"^[ \t\f]*#.*?coding[:=][ \t]*([-\w.]+)", re.ASCII)
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blank_re = re.compile(rb"^[ \t\f]*(?:[#\r\n]|$)", re.ASCII)
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def _get_normal_name(orig_enc: str) -> str:
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"""Imitates get_normal_name in tokenizer.c."""
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# Only care about the first 12 characters.
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enc = orig_enc[:12].lower().replace("_", "-")
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if enc == "utf-8" or enc.startswith("utf-8-"):
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return "utf-8"
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if enc in ("latin-1", "iso-8859-1", "iso-latin-1") or enc.startswith(
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("latin-1-", "iso-8859-1-", "iso-latin-1-")
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):
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return "iso-8859-1"
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return orig_enc
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def detect_encoding(readline: Callable[[], bytes]) -> Tuple[str, List[bytes]]:
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"""
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The detect_encoding() function is used to detect the encoding that should
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be used to decode a Python source file. It requires one argument, readline,
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in the same way as the tokenize() generator.
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It will call readline a maximum of twice, and return the encoding used
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(as a string) and a list of any lines (left as bytes) it has read
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in.
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It detects the encoding from the presence of a utf-8 bom or an encoding
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cookie as specified in pep-0263. If both a bom and a cookie are present, but
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disagree, a SyntaxError will be raised. If the encoding cookie is an invalid
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charset, raise a SyntaxError. Note that if a utf-8 bom is found,
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'utf-8-sig' is returned.
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If no encoding is specified, then the default of 'utf-8' will be returned.
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"""
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bom_found = False
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encoding = None
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default = "utf-8"
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def read_or_stop() -> bytes:
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try:
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return readline()
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except StopIteration:
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return bytes()
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def find_cookie(line: bytes) -> Optional[str]:
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try:
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line_string = line.decode("ascii")
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except UnicodeDecodeError:
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return None
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match = cookie_re.match(line_string)
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if not match:
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return None
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encoding = _get_normal_name(match.group(1))
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try:
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codec = lookup(encoding)
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except LookupError:
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# This behaviour mimics the Python interpreter
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raise SyntaxError("unknown encoding: " + encoding)
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if bom_found:
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if codec.name != "utf-8":
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# This behaviour mimics the Python interpreter
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raise SyntaxError("encoding problem: utf-8")
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encoding += "-sig"
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return encoding
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first = read_or_stop()
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if first.startswith(BOM_UTF8):
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bom_found = True
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first = first[3:]
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default = "utf-8-sig"
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if not first:
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return default, []
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encoding = find_cookie(first)
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if encoding:
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return encoding, [first]
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if not blank_re.match(first):
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return default, [first]
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second = read_or_stop()
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if not second:
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return default, [first]
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encoding = find_cookie(second)
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if encoding:
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return encoding, [first, second]
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return default, [first, second]
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def untokenize(iterable: Iterable[TokenInfo]) -> Text:
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"""Transform tokens back into Python source code.
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Each element returned by the iterable must be a token sequence
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with at least two elements, a token number and token value. If
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only two tokens are passed, the resulting output is poor.
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Round-trip invariant for full input:
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Untokenized source will match input source exactly
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Round-trip invariant for limited input:
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# Output text will tokenize the back to the input
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t1 = [tok[:2] for tok in generate_tokens(f.readline)]
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newcode = untokenize(t1)
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readline = iter(newcode.splitlines(1)).next
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t2 = [tok[:2] for tokin generate_tokens(readline)]
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assert t1 == t2
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"""
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ut = Untokenizer()
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return ut.untokenize(iterable)
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def generate_tokens(
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readline: Callable[[], Text], grammar: Optional[Grammar] = None
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) -> Iterator[GoodTokenInfo]:
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"""
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The generate_tokens() generator requires one argument, readline, which
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must be a callable object which provides the same interface as the
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readline() method of built-in file objects. Each call to the function
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should return one line of input as a string. Alternately, readline
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can be a callable function terminating with StopIteration:
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readline = open(myfile).next # Example of alternate readline
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The generator produces 5-tuples with these members: the token type; the
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token string; a 2-tuple (srow, scol) of ints specifying the row and
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column where the token begins in the source; a 2-tuple (erow, ecol) of
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ints specifying the row and column where the token ends in the source;
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and the line on which the token was found. The line passed is the
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logical line; continuation lines are included.
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"""
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lnum = parenlev = continued = 0
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numchars: Final = "0123456789"
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contstr, needcont = "", 0
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contline: Optional[str] = None
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indents = [0]
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# If we know we're parsing 3.7+, we can unconditionally parse `async` and
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# `await` as keywords.
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async_keywords = False if grammar is None else grammar.async_keywords
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# 'stashed' and 'async_*' are used for async/await parsing
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stashed: Optional[GoodTokenInfo] = None
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async_def = False
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async_def_indent = 0
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async_def_nl = False
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strstart: Tuple[int, int]
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endprog: Pattern[str]
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while 1: # loop over lines in stream
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try:
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line = readline()
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except StopIteration:
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line = ""
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lnum += 1
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pos, max = 0, len(line)
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if contstr: # continued string
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assert contline is not None
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if not line:
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raise TokenError("EOF in multi-line string", strstart)
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endmatch = endprog.match(line)
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if endmatch:
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pos = end = endmatch.end(0)
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yield (
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STRING,
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contstr + line[:end],
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strstart,
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(lnum, end),
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contline + line,
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)
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contstr, needcont = "", 0
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contline = None
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elif needcont and line[-2:] != "\\\n" and line[-3:] != "\\\r\n":
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yield (
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ERRORTOKEN,
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contstr + line,
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strstart,
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(lnum, len(line)),
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contline,
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)
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contstr = ""
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contline = None
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continue
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else:
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contstr = contstr + line
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contline = contline + line
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continue
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elif parenlev == 0 and not continued: # new statement
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if not line:
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break
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column = 0
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while pos < max: # measure leading whitespace
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if line[pos] == " ":
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column += 1
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elif line[pos] == "\t":
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column = (column // tabsize + 1) * tabsize
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elif line[pos] == "\f":
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column = 0
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else:
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break
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pos += 1
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if pos == max:
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break
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if stashed:
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yield stashed
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stashed = None
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if line[pos] in "\r\n": # skip blank lines
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yield (NL, line[pos:], (lnum, pos), (lnum, len(line)), line)
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continue
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if line[pos] == "#": # skip comments
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comment_token = line[pos:].rstrip("\r\n")
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nl_pos = pos + len(comment_token)
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yield (
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COMMENT,
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|
comment_token,
|
|
(lnum, pos),
|
|
(lnum, nl_pos),
|
|
line,
|
|
)
|
|
yield (NL, line[nl_pos:], (lnum, nl_pos), (lnum, len(line)), line)
|
|
continue
|
|
|
|
if column > indents[-1]: # count indents
|
|
indents.append(column)
|
|
yield (INDENT, line[:pos], (lnum, 0), (lnum, pos), line)
|
|
|
|
while column < indents[-1]: # count dedents
|
|
if column not in indents:
|
|
raise IndentationError(
|
|
"unindent does not match any outer indentation level",
|
|
("<tokenize>", lnum, pos, line),
|
|
)
|
|
indents = indents[:-1]
|
|
|
|
if async_def and async_def_indent >= indents[-1]:
|
|
async_def = False
|
|
async_def_nl = False
|
|
async_def_indent = 0
|
|
|
|
yield (DEDENT, "", (lnum, pos), (lnum, pos), line)
|
|
|
|
if async_def and async_def_nl and async_def_indent >= indents[-1]:
|
|
async_def = False
|
|
async_def_nl = False
|
|
async_def_indent = 0
|
|
|
|
else: # continued statement
|
|
if not line:
|
|
raise TokenError("EOF in multi-line statement", (lnum, 0))
|
|
continued = 0
|
|
|
|
while pos < max:
|
|
pseudomatch = pseudoprog.match(line, pos)
|
|
if pseudomatch: # scan for tokens
|
|
start, end = pseudomatch.span(1)
|
|
spos, epos, pos = (lnum, start), (lnum, end), end
|
|
token, initial = line[start:end], line[start]
|
|
|
|
if initial in numchars or (
|
|
initial == "." and token != "."
|
|
): # ordinary number
|
|
yield (NUMBER, token, spos, epos, line)
|
|
elif initial in "\r\n":
|
|
newline = NEWLINE
|
|
if parenlev > 0:
|
|
newline = NL
|
|
elif async_def:
|
|
async_def_nl = True
|
|
if stashed:
|
|
yield stashed
|
|
stashed = None
|
|
yield (newline, token, spos, epos, line)
|
|
|
|
elif initial == "#":
|
|
assert not token.endswith("\n")
|
|
if stashed:
|
|
yield stashed
|
|
stashed = None
|
|
yield (COMMENT, token, spos, epos, line)
|
|
elif token in triple_quoted:
|
|
endprog = endprogs[token]
|
|
endmatch = endprog.match(line, pos)
|
|
if endmatch: # all on one line
|
|
pos = endmatch.end(0)
|
|
token = line[start:pos]
|
|
if stashed:
|
|
yield stashed
|
|
stashed = None
|
|
yield (STRING, token, spos, (lnum, pos), line)
|
|
else:
|
|
strstart = (lnum, start) # multiple lines
|
|
contstr = line[start:]
|
|
contline = line
|
|
break
|
|
elif (
|
|
initial in single_quoted
|
|
or token[:2] in single_quoted
|
|
or token[:3] in single_quoted
|
|
):
|
|
if token[-1] == "\n": # continued string
|
|
strstart = (lnum, start)
|
|
endprog = (
|
|
endprogs[initial]
|
|
or endprogs[token[1]]
|
|
or endprogs[token[2]]
|
|
)
|
|
contstr, needcont = line[start:], 1
|
|
contline = line
|
|
break
|
|
else: # ordinary string
|
|
if stashed:
|
|
yield stashed
|
|
stashed = None
|
|
yield (STRING, token, spos, epos, line)
|
|
elif initial.isidentifier(): # ordinary name
|
|
if token in ("async", "await"):
|
|
if async_keywords or async_def:
|
|
yield (
|
|
ASYNC if token == "async" else AWAIT,
|
|
token,
|
|
spos,
|
|
epos,
|
|
line,
|
|
)
|
|
continue
|
|
|
|
tok = (NAME, token, spos, epos, line)
|
|
if token == "async" and not stashed:
|
|
stashed = tok
|
|
continue
|
|
|
|
if token in ("def", "for"):
|
|
if stashed and stashed[0] == NAME and stashed[1] == "async":
|
|
|
|
if token == "def":
|
|
async_def = True
|
|
async_def_indent = indents[-1]
|
|
|
|
yield (
|
|
ASYNC,
|
|
stashed[1],
|
|
stashed[2],
|
|
stashed[3],
|
|
stashed[4],
|
|
)
|
|
stashed = None
|
|
|
|
if stashed:
|
|
yield stashed
|
|
stashed = None
|
|
|
|
yield tok
|
|
elif initial == "\\": # continued stmt
|
|
# This yield is new; needed for better idempotency:
|
|
if stashed:
|
|
yield stashed
|
|
stashed = None
|
|
yield (NL, token, spos, (lnum, pos), line)
|
|
continued = 1
|
|
else:
|
|
if initial in "([{":
|
|
parenlev += 1
|
|
elif initial in ")]}":
|
|
parenlev -= 1
|
|
if stashed:
|
|
yield stashed
|
|
stashed = None
|
|
yield (OP, token, spos, epos, line)
|
|
else:
|
|
yield (ERRORTOKEN, line[pos], (lnum, pos), (lnum, pos + 1), line)
|
|
pos += 1
|
|
|
|
if stashed:
|
|
yield stashed
|
|
stashed = None
|
|
|
|
for indent in indents[1:]: # pop remaining indent levels
|
|
yield (DEDENT, "", (lnum, 0), (lnum, 0), "")
|
|
yield (ENDMARKER, "", (lnum, 0), (lnum, 0), "")
|
|
|
|
|
|
if __name__ == "__main__": # testing
|
|
import sys
|
|
|
|
if len(sys.argv) > 1:
|
|
tokenize(open(sys.argv[1]).readline)
|
|
else:
|
|
tokenize(sys.stdin.readline)
|