591 lines
22 KiB
Python
591 lines
22 KiB
Python
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"""Patched version of standard library tokenize, to deal with various bugs.
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Based on Python 3.2 code.
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Patches:
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- Gareth Rees' patch for Python issue #12691 (untokenizing)
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- Except we don't encode the output of untokenize
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- Python 2 compatible syntax, so that it can be byte-compiled at installation
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- Newlines in comments and blank lines should be either NL or NEWLINE, depending
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on whether they are in a multi-line statement. Filed as Python issue #17061.
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- Export generate_tokens & TokenError
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- u and rb literals are allowed under Python 3.3 and above.
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------------------------------------------------------------------------------
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Tokenization help for Python programs.
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tokenize(readline) is a generator that breaks a stream of bytes into
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Python tokens. It decodes the bytes according to PEP-0263 for
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determining source file encoding.
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It accepts a readline-like method which is called repeatedly to get the
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next line of input (or b"" for EOF). It generates 5-tuples with these
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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. Additionally, all token lists start with an ENCODING token
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which tells you which encoding was used to decode the bytes stream.
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"""
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__author__ = 'Ka-Ping Yee <ping@lfw.org>'
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__credits__ = ('GvR, ESR, Tim Peters, Thomas Wouters, Fred Drake, '
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'Skip Montanaro, Raymond Hettinger, Trent Nelson, '
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'Michael Foord')
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import builtins
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import re
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import sys
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from token import *
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from codecs import lookup, BOM_UTF8
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import collections
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from io import TextIOWrapper
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cookie_re = re.compile("coding[:=]\s*([-\w.]+)")
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import token
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__all__ = token.__all__ + ["COMMENT", "tokenize", "detect_encoding",
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"NL", "untokenize", "ENCODING", "TokenInfo"]
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del token
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__all__ += ["generate_tokens", "TokenError"]
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COMMENT = N_TOKENS
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tok_name[COMMENT] = 'COMMENT'
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NL = N_TOKENS + 1
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tok_name[NL] = 'NL'
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ENCODING = N_TOKENS + 2
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tok_name[ENCODING] = 'ENCODING'
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N_TOKENS += 3
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class TokenInfo(collections.namedtuple('TokenInfo', 'type string start end line')):
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def __repr__(self):
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annotated_type = '%d (%s)' % (self.type, tok_name[self.type])
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return ('TokenInfo(type=%s, string=%r, start=%r, end=%r, line=%r)' %
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self._replace(type=annotated_type))
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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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# Note: we use unicode matching for names ("\w") but ascii matching for
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# number literals.
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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'\w+'
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Hexnumber = r'0[xX][0-9a-fA-F]+'
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Binnumber = r'0[bB][01]+'
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Octnumber = r'0[oO][0-7]+'
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Decnumber = r'(?:0+|[1-9][0-9]*)'
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Intnumber = group(Hexnumber, Binnumber, Octnumber, Decnumber)
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Exponent = r'[eE][-+]?[0-9]+'
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Pointfloat = group(r'[0-9]+\.[0-9]*', r'\.[0-9]+') + maybe(Exponent)
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Expfloat = r'[0-9]+' + Exponent
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Floatnumber = group(Pointfloat, Expfloat)
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Imagnumber = group(r'[0-9]+[jJ]', Floatnumber + r'[jJ]')
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Number = group(Imagnumber, Floatnumber, Intnumber)
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StringPrefix = r'(?:[bB][rR]?|[rR][bB]?|[uU])?'
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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(StringPrefix + "'''", StringPrefix + '"""')
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# Single-line ' or " string.
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String = group(StringPrefix + r"'[^\n'\\]*(?:\\.[^\n'\\]*)*'",
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StringPrefix + r'"[^\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"!=",
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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'\.\.\.', 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(StringPrefix + r"'[^\n'\\]*(?:\\.[^\n'\\]*)*" +
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group("'", r'\\\r?\n'),
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StringPrefix + r'"[^\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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def _compile(expr):
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return re.compile(expr, re.UNICODE)
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tokenprog, pseudoprog, single3prog, double3prog = map(
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_compile, (Token, PseudoToken, Single3, Double3))
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endprogs = {"'": _compile(Single), '"': _compile(Double),
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"'''": single3prog, '"""': double3prog,
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"r'''": single3prog, 'r"""': double3prog,
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"b'''": single3prog, 'b"""': double3prog,
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"R'''": single3prog, 'R"""': double3prog,
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"B'''": single3prog, 'B"""': 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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"BR'''": single3prog, 'BR"""': double3prog,
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'r': None, 'R': None, '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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"b'''", 'b"""', "B'''", 'B"""',
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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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single_quoted = {}
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for t in ("'", '"',
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"r'", 'r"', "R'", 'R"',
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"b'", 'b"', "B'", 'B"',
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"br'", 'br"', "Br'", 'Br"',
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"bR'", 'bR"', "BR'", 'BR"' ):
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single_quoted[t] = t
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for _prefix in ['rb', 'rB', 'Rb', 'RB', 'u', 'U']:
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_t2 = _prefix+'"""'
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endprogs[_t2] = double3prog
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triple_quoted[_t2] = _t2
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_t1 = _prefix + "'''"
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endprogs[_t1] = single3prog
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triple_quoted[_t1] = _t1
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single_quoted[_prefix+'"'] = _prefix+'"'
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single_quoted[_prefix+"'"] = _prefix+"'"
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del _prefix, _t2, _t1
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endprogs['u'] = None
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endprogs['U'] = None
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del _compile
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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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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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self.encoding = 'utf-8'
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def add_whitespace(self, tok_type, 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 > 0:
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self.tokens.append(" " * col_offset)
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elif row > self.prev_row and tok_type not in (NEWLINE, NL, ENDMARKER):
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# Line was backslash-continued.
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self.tokens.append(" ")
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def untokenize(self, tokens):
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iterable = iter(tokens)
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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 = t[:4]
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if tok_type == ENCODING:
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self.encoding = token
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continue
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self.add_whitespace(tok_type, 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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# This import is here to avoid problems when the itertools
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# module is not built yet and tokenize is imported.
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from itertools import chain
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startline = False
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prevstring = False
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indents = []
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toks_append = self.tokens.append
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for tok in chain([token], iterable):
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toknum, tokval = tok[:2]
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if toknum == ENCODING:
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self.encoding = tokval
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continue
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if toknum in (NAME, NUMBER):
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tokval += ' '
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# Insert a space between two consecutive strings
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if toknum == STRING:
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if prevstring:
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tokval = ' ' + tokval
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prevstring = True
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else:
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prevstring = False
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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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def untokenize(tokens):
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"""
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Convert ``tokens`` (an iterable) back into Python source code. Return
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a bytes object, encoded using the encoding specified by the last
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ENCODING token in ``tokens``, or UTF-8 if no ENCODING token is found.
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The result is guaranteed to tokenize back to match the input so that
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the conversion is lossless and round-trips are assured. The
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guarantee applies only to the token type and token string as the
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spacing between tokens (column positions) may change.
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:func:`untokenize` has two modes. If the input tokens are sequences
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of length 2 (``type``, ``string``) then spaces are added as necessary to
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preserve the round-trip property.
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If the input tokens are sequences of length 4 or more (``type``,
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``string``, ``start``, ``end``), as returned by :func:`tokenize`, then
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spaces are added so that each token appears in the result at the
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position indicated by ``start`` and ``end``, if possible.
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"""
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return Untokenizer().untokenize(tokens)
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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 argment, 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 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,
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but disagree, a SyntaxError will be raised. If the encoding cookie is an
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invalid 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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try:
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return readline()
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except StopIteration:
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return b''
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def find_cookie(line):
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try:
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# Decode as UTF-8. Either the line is an encoding declaration,
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# in which case it should be pure ASCII, or it must be UTF-8
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# per default encoding.
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line_string = line.decode('utf-8')
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except UnicodeDecodeError:
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raise SyntaxError("invalid or missing encoding declaration")
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matches = cookie_re.findall(line_string)
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if not matches:
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return None
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encoding = _get_normal_name(matches[0])
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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 encoding != '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):
|
||
|
|
bom_found = True
|
||
|
|
first = first[3:]
|
||
|
|
default = 'utf-8-sig'
|
||
|
|
if not first:
|
||
|
|
return default, []
|
||
|
|
|
||
|
|
encoding = find_cookie(first)
|
||
|
|
if encoding:
|
||
|
|
return encoding, [first]
|
||
|
|
|
||
|
|
second = read_or_stop()
|
||
|
|
if not second:
|
||
|
|
return default, [first]
|
||
|
|
|
||
|
|
encoding = find_cookie(second)
|
||
|
|
if encoding:
|
||
|
|
return encoding, [first, second]
|
||
|
|
|
||
|
|
return default, [first, second]
|
||
|
|
|
||
|
|
|
||
|
|
def open(filename):
|
||
|
|
"""Open a file in read only mode using the encoding detected by
|
||
|
|
detect_encoding().
|
||
|
|
"""
|
||
|
|
buffer = builtins.open(filename, 'rb')
|
||
|
|
encoding, lines = detect_encoding(buffer.readline)
|
||
|
|
buffer.seek(0)
|
||
|
|
text = TextIOWrapper(buffer, encoding, line_buffering=True)
|
||
|
|
text.mode = 'r'
|
||
|
|
return text
|
||
|
|
|
||
|
|
|
||
|
|
def tokenize(readline):
|
||
|
|
"""
|
||
|
|
The tokenize() generator requires one argment, readline, which
|
||
|
|
must be a callable object which provides the same interface as the
|
||
|
|
readline() method of built-in file objects. Each call to the function
|
||
|
|
should return one line of input as bytes. Alternately, readline
|
||
|
|
can be a callable function terminating with :class:`StopIteration`::
|
||
|
|
|
||
|
|
readline = open(myfile, 'rb').__next__ # Example of alternate readline
|
||
|
|
|
||
|
|
The generator produces 5-tuples with these members: the token type; the
|
||
|
|
token string; a 2-tuple (srow, scol) of ints specifying the row and
|
||
|
|
column where the token begins in the source; a 2-tuple (erow, ecol) of
|
||
|
|
ints specifying the row and column where the token ends in the source;
|
||
|
|
and the line on which the token was found. The line passed is the
|
||
|
|
logical line; continuation lines are included.
|
||
|
|
|
||
|
|
The first token sequence will always be an ENCODING token
|
||
|
|
which tells you which encoding was used to decode the bytes stream.
|
||
|
|
"""
|
||
|
|
# This import is here to avoid problems when the itertools module is not
|
||
|
|
# built yet and tokenize is imported.
|
||
|
|
from itertools import chain, repeat
|
||
|
|
encoding, consumed = detect_encoding(readline)
|
||
|
|
rl_gen = iter(readline, b"")
|
||
|
|
empty = repeat(b"")
|
||
|
|
return _tokenize(chain(consumed, rl_gen, empty).__next__, encoding)
|
||
|
|
|
||
|
|
|
||
|
|
def _tokenize(readline, encoding):
|
||
|
|
lnum = parenlev = continued = 0
|
||
|
|
numchars = '0123456789'
|
||
|
|
contstr, needcont = '', 0
|
||
|
|
contline = None
|
||
|
|
indents = [0]
|
||
|
|
|
||
|
|
if encoding is not None:
|
||
|
|
if encoding == "utf-8-sig":
|
||
|
|
# BOM will already have been stripped.
|
||
|
|
encoding = "utf-8"
|
||
|
|
yield TokenInfo(ENCODING, encoding, (0, 0), (0, 0), '')
|
||
|
|
while True: # loop over lines in stream
|
||
|
|
try:
|
||
|
|
line = readline()
|
||
|
|
except StopIteration:
|
||
|
|
line = b''
|
||
|
|
|
||
|
|
if encoding is not None:
|
||
|
|
line = line.decode(encoding)
|
||
|
|
lnum += 1
|
||
|
|
pos, max = 0, len(line)
|
||
|
|
|
||
|
|
if contstr: # continued string
|
||
|
|
if not line:
|
||
|
|
raise TokenError("EOF in multi-line string", strstart)
|
||
|
|
endmatch = endprog.match(line)
|
||
|
|
if endmatch:
|
||
|
|
pos = end = endmatch.end(0)
|
||
|
|
yield TokenInfo(STRING, contstr + line[:end],
|
||
|
|
strstart, (lnum, end), contline + line)
|
||
|
|
contstr, needcont = '', 0
|
||
|
|
contline = None
|
||
|
|
elif needcont and line[-2:] != '\\\n' and line[-3:] != '\\\r\n':
|
||
|
|
yield TokenInfo(ERRORTOKEN, contstr + line,
|
||
|
|
strstart, (lnum, len(line)), contline)
|
||
|
|
contstr = ''
|
||
|
|
contline = None
|
||
|
|
continue
|
||
|
|
else:
|
||
|
|
contstr = contstr + line
|
||
|
|
contline = contline + line
|
||
|
|
continue
|
||
|
|
|
||
|
|
elif parenlev == 0 and not continued: # new statement
|
||
|
|
if not line: break
|
||
|
|
column = 0
|
||
|
|
while pos < max: # measure leading whitespace
|
||
|
|
if line[pos] == ' ':
|
||
|
|
column += 1
|
||
|
|
elif line[pos] == '\t':
|
||
|
|
column = (column//tabsize + 1)*tabsize
|
||
|
|
elif line[pos] == '\f':
|
||
|
|
column = 0
|
||
|
|
else:
|
||
|
|
break
|
||
|
|
pos += 1
|
||
|
|
if pos == max:
|
||
|
|
break
|
||
|
|
|
||
|
|
if line[pos] in '#\r\n': # skip comments or blank lines
|
||
|
|
if line[pos] == '#':
|
||
|
|
comment_token = line[pos:].rstrip('\r\n')
|
||
|
|
nl_pos = pos + len(comment_token)
|
||
|
|
yield TokenInfo(COMMENT, comment_token,
|
||
|
|
(lnum, pos), (lnum, pos + len(comment_token)), line)
|
||
|
|
yield TokenInfo(NEWLINE, line[nl_pos:],
|
||
|
|
(lnum, nl_pos), (lnum, len(line)), line)
|
||
|
|
else:
|
||
|
|
yield TokenInfo(NEWLINE, line[pos:],
|
||
|
|
(lnum, pos), (lnum, len(line)), line)
|
||
|
|
continue
|
||
|
|
|
||
|
|
if column > indents[-1]: # count indents or dedents
|
||
|
|
indents.append(column)
|
||
|
|
yield TokenInfo(INDENT, line[:pos], (lnum, 0), (lnum, pos), line)
|
||
|
|
while column < indents[-1]:
|
||
|
|
if column not in indents:
|
||
|
|
raise IndentationError(
|
||
|
|
"unindent does not match any outer indentation level",
|
||
|
|
("<tokenize>", lnum, pos, line))
|
||
|
|
indents = indents[:-1]
|
||
|
|
yield TokenInfo(DEDENT, '', (lnum, pos), (lnum, pos), line)
|
||
|
|
|
||
|
|
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 # ordinary number
|
||
|
|
(initial == '.' and token != '.' and token != '...')):
|
||
|
|
yield TokenInfo(NUMBER, token, spos, epos, line)
|
||
|
|
elif initial in '\r\n':
|
||
|
|
yield TokenInfo(NL if parenlev > 0 else NEWLINE,
|
||
|
|
token, spos, epos, line)
|
||
|
|
elif initial == '#':
|
||
|
|
assert not token.endswith("\n")
|
||
|
|
yield TokenInfo(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]
|
||
|
|
yield TokenInfo(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
|
||
|
|
yield TokenInfo(STRING, token, spos, epos, line)
|
||
|
|
elif initial.isidentifier(): # ordinary name
|
||
|
|
yield TokenInfo(NAME, token, spos, epos, line)
|
||
|
|
elif initial == '\\': # continued stmt
|
||
|
|
continued = 1
|
||
|
|
else:
|
||
|
|
if initial in '([{':
|
||
|
|
parenlev += 1
|
||
|
|
elif initial in ')]}':
|
||
|
|
parenlev -= 1
|
||
|
|
yield TokenInfo(OP, token, spos, epos, line)
|
||
|
|
else:
|
||
|
|
yield TokenInfo(ERRORTOKEN, line[pos],
|
||
|
|
(lnum, pos), (lnum, pos+1), line)
|
||
|
|
pos += 1
|
||
|
|
|
||
|
|
for indent in indents[1:]: # pop remaining indent levels
|
||
|
|
yield TokenInfo(DEDENT, '', (lnum, 0), (lnum, 0), '')
|
||
|
|
yield TokenInfo(ENDMARKER, '', (lnum, 0), (lnum, 0), '')
|
||
|
|
|
||
|
|
|
||
|
|
# An undocumented, backwards compatible, API for all the places in the standard
|
||
|
|
# library that expect to be able to use tokenize with strings
|
||
|
|
def generate_tokens(readline):
|
||
|
|
return _tokenize(readline, None)
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
# Quick sanity check
|
||
|
|
s = b'''def parseline(self, line):
|
||
|
|
"""Parse the line into a command name and a string containing
|
||
|
|
the arguments. Returns a tuple containing (command, args, line).
|
||
|
|
'command' and 'args' may be None if the line couldn't be parsed.
|
||
|
|
"""
|
||
|
|
line = line.strip()
|
||
|
|
if not line:
|
||
|
|
return None, None, line
|
||
|
|
elif line[0] == '?':
|
||
|
|
line = 'help ' + line[1:]
|
||
|
|
elif line[0] == '!':
|
||
|
|
if hasattr(self, 'do_shell'):
|
||
|
|
line = 'shell ' + line[1:]
|
||
|
|
else:
|
||
|
|
return None, None, line
|
||
|
|
i, n = 0, len(line)
|
||
|
|
while i < n and line[i] in self.identchars: i = i+1
|
||
|
|
cmd, arg = line[:i], line[i:].strip()
|
||
|
|
return cmd, arg, line
|
||
|
|
'''
|
||
|
|
for tok in tokenize(iter(s.splitlines()).__next__):
|
||
|
|
print(tok)
|