OILS
/
pgen2
/
tokenize.py
1 |
# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006 Python Software Foundation.
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# All rights reserved.
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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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__author__ = 'Ka-Ping Yee <ping@lfw.org>'
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__credits__ = \
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'GvR, ESR, Tim Peters, Thomas Wouters, Fred Drake, Skip Montanaro'
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import string, re
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from codecs import BOM_UTF8, lookup
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#from lib2to3.pgen2.token import *
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from . import token
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from .token import *
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__all__ = [x for x in dir(token) if x[0] != '_'] + ["tokenize",
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"generate_tokens", "untokenize"]
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del token
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try:
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bytes
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except NameError:
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# Support bytes type in Python <= 2.5, so 2to3 turns itself into
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# valid Python 3 code.
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bytes = str
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def group(*choices): return '(' + '|'.join(choices) + ')'
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def any(*choices): return group(*choices) + '*'
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def maybe(*choices): return group(*choices) + '?'
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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 = r'[a-zA-Z_]\w*'
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Binnumber = r'0[bB][01]*'
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Hexnumber = r'0[xX][\da-fA-F]*[lL]?'
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Octnumber = r'0[oO]?[0-7]*[lL]?'
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Decnumber = r'[1-9]\d*[lL]?'
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Intnumber = group(Binnumber, Hexnumber, Octnumber, Decnumber)
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Exponent = r'[eE][-+]?\d+'
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Pointfloat = group(r'\d+\.\d*', r'\.\d+') + maybe(Exponent)
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Expfloat = r'\d+' + Exponent
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Floatnumber = group(Pointfloat, Expfloat)
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Imagnumber = group(r'\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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Triple = group("[ubUB]?[rR]?'''", '[ubUB]?[rR]?"""')
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# Single-line ' or " string.
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String = group(r"[uU]?[rR]?'[^\n'\\]*(?:\\.[^\n'\\]*)*'",
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r'[uU]?[rR]?"[^\n"\\]*(?:\\.[^\n"\\]*)*"')
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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(r"\*\*=?", r">>=?", r"<<=?", r"<>", r"!=",
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r"//=?", r"->",
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r"[+\-*/%&@|^=<>]=?",
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r"~")
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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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PlainToken = group(Number, Funny, String, Name)
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Token = Ignore + PlainToken
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# First (or only) line of ' or " string.
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ContStr = group(r"[uUbB]?[rR]?'[^\n'\\]*(?:\\.[^\n'\\]*)*" +
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group("'", r'\\\r?\n'),
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r'[uUbB]?[rR]?"[^\n"\\]*(?:\\.[^\n"\\]*)*' +
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group('"', r'\\\r?\n'))
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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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tokenprog, pseudoprog, single3prog, double3prog = list(map(
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re.compile, (Token, PseudoToken, Single3, Double3)))
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endprogs = {"'": re.compile(Single), '"': re.compile(Double),
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"'''": single3prog, '"""': double3prog,
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"r'''": single3prog, 'r"""': double3prog,
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"u'''": single3prog, 'u"""': double3prog,
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"b'''": single3prog, 'b"""': double3prog,
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"ur'''": single3prog, 'ur"""': double3prog,
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"br'''": single3prog, 'br"""': double3prog,
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"R'''": single3prog, 'R"""': double3prog,
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"U'''": single3prog, 'U"""': double3prog,
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"B'''": single3prog, 'B"""': double3prog,
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"uR'''": single3prog, 'uR"""': double3prog,
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"Ur'''": single3prog, 'Ur"""': double3prog,
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"UR'''": single3prog, 'UR"""': double3prog,
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"bR'''": single3prog, 'bR"""': double3prog,
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"Br'''": single3prog, 'Br"""': double3prog,
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"BR'''": single3prog, 'BR"""': double3prog,
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'r': None, 'R': None,
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'u': None, 'U': None,
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'b': None, 'B': None}
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triple_quoted = {}
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for t in ("'''", '"""',
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"r'''", 'r"""', "R'''", 'R"""',
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"u'''", 'u"""', "U'''", 'U"""',
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"b'''", 'b"""', "B'''", 'B"""',
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"ur'''", 'ur"""', "Ur'''", 'Ur"""',
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"uR'''", 'uR"""', "UR'''", 'UR"""',
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"br'''", 'br"""', "Br'''", 'Br"""',
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"bR'''", 'bR"""', "BR'''", 'BR"""',):
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triple_quoted[t] = t
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SingleQuoted = {}
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for t in ("'", '"',
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"r'", 'r"', "R'", 'R"',
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"u'", 'u"', "U'", 'U"',
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"b'", 'b"', "B'", 'B"',
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"ur'", 'ur"', "Ur'", 'Ur"',
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"uR'", 'uR"', "UR'", 'UR"',
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"br'", 'br"', "Br'", 'Br"',
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"bR'", 'bR"', "BR'", 'BR"', ):
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SingleQuoted[t] = t
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tabsize = 8
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class TokenError(Exception): pass
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class StopTokenizing(Exception): 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("%d,%d-%d,%d:\t%s\t%s" % \
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(srow, scol, erow, ecol, tok_name[type], repr(token)))
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def tokenize(readline, tokeneater=printtoken):
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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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class Untokenizer:
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def __init__(self):
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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):
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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):
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for t in iterable:
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if len(t) == 2:
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self.compat(t, iterable)
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break
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tok_type, token, start, end, line = t
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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, iterable):
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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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# Commented out because re.ASCII not in Python 2.
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#cookie_re = re.compile(r'^[ \t\f]*#.*?coding[:=][ \t]*([-\w.]+)', re.ASCII)
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#blank_re = re.compile(br'^[ \t\f]*(?:[#\r\n]|$)', re.ASCII)
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def _get_normal_name(orig_enc):
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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 \
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enc.startswith(("latin-1-", "iso-8859-1-", "iso-latin-1-")):
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return "iso-8859-1"
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return orig_enc
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def detect_encoding(readline):
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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():
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278 |
try:
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279 |
return readline()
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except StopIteration:
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return bytes()
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282 |
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283 |
def find_cookie(line):
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284 |
try:
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line_string = line.decode('ascii')
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286 |
except UnicodeDecodeError:
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287 |
return None
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288 |
match = cookie_re.match(line_string)
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289 |
if not match:
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290 |
return None
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291 |
encoding = _get_normal_name(match.group(1))
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292 |
try:
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293 |
codec = lookup(encoding)
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294 |
except LookupError:
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295 |
# This behaviour mimics the Python interpreter
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296 |
raise SyntaxError("unknown encoding: " + encoding)
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297 |
|
298 |
if bom_found:
|
299 |
if codec.name != 'utf-8':
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300 |
# This behaviour mimics the Python interpreter
|
301 |
raise SyntaxError('encoding problem: utf-8')
|
302 |
encoding += '-sig'
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303 |
return encoding
|
304 |
|
305 |
first = read_or_stop()
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306 |
if first.startswith(BOM_UTF8):
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307 |
bom_found = True
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308 |
first = first[3:]
|
309 |
default = 'utf-8-sig'
|
310 |
if not first:
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311 |
return default, []
|
312 |
|
313 |
encoding = find_cookie(first)
|
314 |
if encoding:
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315 |
return encoding, [first]
|
316 |
if not blank_re.match(first):
|
317 |
return default, [first]
|
318 |
|
319 |
second = read_or_stop()
|
320 |
if not second:
|
321 |
return default, [first]
|
322 |
|
323 |
encoding = find_cookie(second)
|
324 |
if encoding:
|
325 |
return encoding, [first, second]
|
326 |
|
327 |
return default, [first, second]
|
328 |
|
329 |
def untokenize(iterable):
|
330 |
"""Transform tokens back into Python source code.
|
331 |
|
332 |
Each element returned by the iterable must be a token sequence
|
333 |
with at least two elements, a token number and token value. If
|
334 |
only two tokens are passed, the resulting output is poor.
|
335 |
|
336 |
Round-trip invariant for full input:
|
337 |
Untokenized source will match input source exactly
|
338 |
|
339 |
Round-trip invariant for limited input:
|
340 |
# Output text will tokenize the back to the input
|
341 |
t1 = [tok[:2] for tok in generate_tokens(f.readline)]
|
342 |
newcode = untokenize(t1)
|
343 |
readline = iter(newcode.splitlines(1)).next
|
344 |
t2 = [tok[:2] for tokin generate_tokens(readline)]
|
345 |
assert t1 == t2
|
346 |
"""
|
347 |
ut = Untokenizer()
|
348 |
return ut.untokenize(iterable)
|
349 |
|
350 |
def generate_tokens(readline):
|
351 |
"""
|
352 |
The generate_tokens() generator requires one argument, readline, which
|
353 |
must be a callable object which provides the same interface as the
|
354 |
readline() method of built-in file objects. Each call to the function
|
355 |
should return one line of input as a string. Alternately, readline
|
356 |
can be a callable function terminating with StopIteration:
|
357 |
readline = open(myfile).next # Example of alternate readline
|
358 |
|
359 |
The generator produces 5-tuples with these members: the token type; the
|
360 |
token string; a 2-tuple (srow, scol) of ints specifying the row and
|
361 |
column where the token begins in the source; a 2-tuple (erow, ecol) of
|
362 |
ints specifying the row and column where the token ends in the source;
|
363 |
and the line on which the token was found. The line passed is the
|
364 |
logical line; continuation lines are included.
|
365 |
"""
|
366 |
lnum = parenlev = continued = 0
|
367 |
namechars, numchars = string.ascii_letters + '_', '0123456789'
|
368 |
contstr, needcont = '', 0
|
369 |
contline = None
|
370 |
indents = [0]
|
371 |
|
372 |
# 'stashed' and 'async_*' are used for async/await parsing
|
373 |
stashed = None
|
374 |
async_def = False
|
375 |
async_def_indent = 0
|
376 |
async_def_nl = False
|
377 |
|
378 |
while 1: # loop over lines in stream
|
379 |
try:
|
380 |
line = readline()
|
381 |
except StopIteration:
|
382 |
line = ''
|
383 |
lnum = lnum + 1
|
384 |
pos, max = 0, len(line)
|
385 |
|
386 |
if contstr: # continued string
|
387 |
if not line:
|
388 |
raise TokenError("EOF in multi-line string", strstart)
|
389 |
endmatch = endprog.match(line)
|
390 |
if endmatch:
|
391 |
pos = end = endmatch.end(0)
|
392 |
yield (STRING, contstr + line[:end],
|
393 |
strstart, (lnum, end), contline + line)
|
394 |
contstr, needcont = '', 0
|
395 |
contline = None
|
396 |
elif needcont and line[-2:] != '\\\n' and line[-3:] != '\\\r\n':
|
397 |
yield (ERRORTOKEN, contstr + line,
|
398 |
strstart, (lnum, len(line)), contline)
|
399 |
contstr = ''
|
400 |
contline = None
|
401 |
continue
|
402 |
else:
|
403 |
contstr = contstr + line
|
404 |
contline = contline + line
|
405 |
continue
|
406 |
|
407 |
elif parenlev == 0 and not continued: # new statement
|
408 |
if not line: break
|
409 |
column = 0
|
410 |
while pos < max: # measure leading whitespace
|
411 |
if line[pos] == ' ': column = column + 1
|
412 |
elif line[pos] == '\t': column = (column//tabsize + 1)*tabsize
|
413 |
elif line[pos] == '\f': column = 0
|
414 |
else: break
|
415 |
pos = pos + 1
|
416 |
if pos == max: break
|
417 |
|
418 |
if stashed:
|
419 |
yield stashed
|
420 |
stashed = None
|
421 |
|
422 |
if line[pos] in '#\r\n': # skip comments or blank lines
|
423 |
if line[pos] == '#':
|
424 |
comment_token = line[pos:].rstrip('\r\n')
|
425 |
nl_pos = pos + len(comment_token)
|
426 |
yield (COMMENT, comment_token,
|
427 |
(lnum, pos), (lnum, pos + len(comment_token)), line)
|
428 |
yield (NL, line[nl_pos:],
|
429 |
(lnum, nl_pos), (lnum, len(line)), line)
|
430 |
else:
|
431 |
yield ((NL, COMMENT)[line[pos] == '#'], line[pos:],
|
432 |
(lnum, pos), (lnum, len(line)), line)
|
433 |
continue
|
434 |
|
435 |
if column > indents[-1]: # count indents or dedents
|
436 |
indents.append(column)
|
437 |
yield (INDENT, line[:pos], (lnum, 0), (lnum, pos), line)
|
438 |
while column < indents[-1]:
|
439 |
if column not in indents:
|
440 |
raise IndentationError(
|
441 |
"unindent does not match any outer indentation level",
|
442 |
("<tokenize>", lnum, pos, line))
|
443 |
indents = indents[:-1]
|
444 |
|
445 |
if async_def and async_def_indent >= indents[-1]:
|
446 |
async_def = False
|
447 |
async_def_nl = False
|
448 |
async_def_indent = 0
|
449 |
|
450 |
yield (DEDENT, '', (lnum, pos), (lnum, pos), line)
|
451 |
|
452 |
if async_def and async_def_nl and async_def_indent >= indents[-1]:
|
453 |
async_def = False
|
454 |
async_def_nl = False
|
455 |
async_def_indent = 0
|
456 |
|
457 |
else: # continued statement
|
458 |
if not line:
|
459 |
raise TokenError("EOF in multi-line statement", (lnum, 0))
|
460 |
continued = 0
|
461 |
|
462 |
while pos < max:
|
463 |
pseudomatch = pseudoprog.match(line, pos)
|
464 |
if pseudomatch: # scan for tokens
|
465 |
start, end = pseudomatch.span(1)
|
466 |
spos, epos, pos = (lnum, start), (lnum, end), end
|
467 |
token, initial = line[start:end], line[start]
|
468 |
|
469 |
if initial in numchars or \
|
470 |
(initial == '.' and token != '.'): # ordinary number
|
471 |
yield (NUMBER, token, spos, epos, line)
|
472 |
elif initial in '\r\n':
|
473 |
newline = NEWLINE
|
474 |
if parenlev > 0:
|
475 |
newline = NL
|
476 |
elif async_def:
|
477 |
async_def_nl = True
|
478 |
if stashed:
|
479 |
yield stashed
|
480 |
stashed = None
|
481 |
yield (newline, token, spos, epos, line)
|
482 |
|
483 |
elif initial == '#':
|
484 |
assert not token.endswith("\n")
|
485 |
if stashed:
|
486 |
yield stashed
|
487 |
stashed = None
|
488 |
yield (COMMENT, token, spos, epos, line)
|
489 |
elif token in triple_quoted:
|
490 |
endprog = endprogs[token]
|
491 |
endmatch = endprog.match(line, pos)
|
492 |
if endmatch: # all on one line
|
493 |
pos = endmatch.end(0)
|
494 |
token = line[start:pos]
|
495 |
if stashed:
|
496 |
yield stashed
|
497 |
stashed = None
|
498 |
yield (STRING, token, spos, (lnum, pos), line)
|
499 |
else:
|
500 |
strstart = (lnum, start) # multiple lines
|
501 |
contstr = line[start:]
|
502 |
contline = line
|
503 |
break
|
504 |
elif initial in SingleQuoted or \
|
505 |
token[:2] in SingleQuoted or \
|
506 |
token[:3] in SingleQuoted:
|
507 |
if token[-1] == '\n': # continued string
|
508 |
strstart = (lnum, start)
|
509 |
endprog = (endprogs[initial] or endprogs[token[1]] or
|
510 |
endprogs[token[2]])
|
511 |
contstr, needcont = line[start:], 1
|
512 |
contline = line
|
513 |
break
|
514 |
else: # ordinary string
|
515 |
if stashed:
|
516 |
yield stashed
|
517 |
stashed = None
|
518 |
yield (STRING, token, spos, epos, line)
|
519 |
elif initial in namechars: # ordinary name
|
520 |
if token in ('async', 'await'):
|
521 |
if async_def:
|
522 |
yield (ASYNC if token == 'async' else AWAIT,
|
523 |
token, spos, epos, line)
|
524 |
continue
|
525 |
|
526 |
tok = (NAME, token, spos, epos, line)
|
527 |
if token == 'async' and not stashed:
|
528 |
stashed = tok
|
529 |
continue
|
530 |
|
531 |
if token == 'def':
|
532 |
if (stashed
|
533 |
and stashed[0] == NAME
|
534 |
and stashed[1] == 'async'):
|
535 |
|
536 |
async_def = True
|
537 |
async_def_indent = indents[-1]
|
538 |
|
539 |
yield (ASYNC, stashed[1],
|
540 |
stashed[2], stashed[3],
|
541 |
stashed[4])
|
542 |
stashed = None
|
543 |
|
544 |
if stashed:
|
545 |
yield stashed
|
546 |
stashed = None
|
547 |
|
548 |
yield tok
|
549 |
elif initial == '\\': # continued stmt
|
550 |
# This yield is new; needed for better idempotency:
|
551 |
if stashed:
|
552 |
yield stashed
|
553 |
stashed = None
|
554 |
yield (NL, token, spos, (lnum, pos), line)
|
555 |
continued = 1
|
556 |
else:
|
557 |
if initial in '([{': parenlev = parenlev + 1
|
558 |
elif initial in ')]}': parenlev = parenlev - 1
|
559 |
if stashed:
|
560 |
yield stashed
|
561 |
stashed = None
|
562 |
yield (OP, token, spos, epos, line)
|
563 |
else:
|
564 |
yield (ERRORTOKEN, line[pos],
|
565 |
(lnum, pos), (lnum, pos+1), line)
|
566 |
pos = pos + 1
|
567 |
|
568 |
if stashed:
|
569 |
yield stashed
|
570 |
stashed = None
|
571 |
|
572 |
for indent in indents[1:]: # pop remaining indent levels
|
573 |
yield (DEDENT, '', (lnum, 0), (lnum, 0), '')
|
574 |
yield (ENDMARKER, '', (lnum, 0), (lnum, 0), '')
|
575 |
|
576 |
if __name__ == '__main__': # testing
|
577 |
import sys
|
578 |
if len(sys.argv) > 1: tokenize(open(sys.argv[1]).readline)
|
579 |
else: tokenize(sys.stdin.readline)
|