|
|
"""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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if sys.version_info.minor >= 3:
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StringPrefix = r'(?:[bB][rR]?|[rR][bB]?|[uU])?'
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|
else:
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|
StringPrefix = r'(?:[bB]?[rR]?)?'
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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):
|
|
|
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"""'):
|
|
|
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"' ):
|
|
|
single_quoted[t] = t
|
|
|
|
|
|
if sys.version_info.minor >= 3:
|
|
|
# Python 3.3
|
|
|
for _prefix in ['rb', 'rB', 'Rb', 'RB', 'u', 'U']:
|
|
|
_t2 = _prefix+'"""'
|
|
|
endprogs[_t2] = double3prog
|
|
|
triple_quoted[_t2] = _t2
|
|
|
_t1 = _prefix + "'''"
|
|
|
endprogs[_t1] = single3prog
|
|
|
triple_quoted[_t1] = _t1
|
|
|
single_quoted[_prefix+'"'] = _prefix+'"'
|
|
|
single_quoted[_prefix+"'"] = _prefix+"'"
|
|
|
del _prefix, _t2, _t1
|
|
|
endprogs['u'] = None
|
|
|
endprogs['U'] = None
|
|
|
|
|
|
del _compile
|
|
|
|
|
|
tabsize = 8
|
|
|
|
|
|
class TokenError(Exception): pass
|
|
|
|
|
|
class StopTokenizing(Exception): pass
|
|
|
|
|
|
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|
|
class Untokenizer:
|
|
|
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|
|
def __init__(self):
|
|
|
self.tokens = []
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|
|
self.prev_row = 1
|
|
|
self.prev_col = 0
|
|
|
self.encoding = 'utf-8'
|
|
|
|
|
|
def add_whitespace(self, tok_type, start):
|
|
|
row, col = start
|
|
|
assert row >= self.prev_row
|
|
|
col_offset = col - self.prev_col
|
|
|
if col_offset > 0:
|
|
|
self.tokens.append(" " * col_offset)
|
|
|
elif row > self.prev_row and tok_type not in (NEWLINE, NL, ENDMARKER):
|
|
|
# Line was backslash-continued.
|
|
|
self.tokens.append(" ")
|
|
|
|
|
|
def untokenize(self, tokens):
|
|
|
iterable = iter(tokens)
|
|
|
for t in iterable:
|
|
|
if len(t) == 2:
|
|
|
self.compat(t, iterable)
|
|
|
break
|
|
|
tok_type, token, start, end = t[:4]
|
|
|
if tok_type == ENCODING:
|
|
|
self.encoding = token
|
|
|
continue
|
|
|
self.add_whitespace(tok_type, start)
|
|
|
self.tokens.append(token)
|
|
|
self.prev_row, self.prev_col = end
|
|
|
if tok_type in (NEWLINE, NL):
|
|
|
self.prev_row += 1
|
|
|
self.prev_col = 0
|
|
|
return "".join(self.tokens)
|
|
|
|
|
|
def compat(self, token, iterable):
|
|
|
# This import is here to avoid problems when the itertools
|
|
|
# module is not built yet and tokenize is imported.
|
|
|
from itertools import chain
|
|
|
startline = False
|
|
|
prevstring = False
|
|
|
indents = []
|
|
|
toks_append = self.tokens.append
|
|
|
|
|
|
for tok in chain([token], iterable):
|
|
|
toknum, tokval = tok[:2]
|
|
|
if toknum == ENCODING:
|
|
|
self.encoding = tokval
|
|
|
continue
|
|
|
|
|
|
if toknum in (NAME, NUMBER):
|
|
|
tokval += ' '
|
|
|
|
|
|
# Insert a space between two consecutive strings
|
|
|
if toknum == STRING:
|
|
|
if prevstring:
|
|
|
tokval = ' ' + tokval
|
|
|
prevstring = True
|
|
|
else:
|
|
|
prevstring = False
|
|
|
|
|
|
if toknum == INDENT:
|
|
|
indents.append(tokval)
|
|
|
continue
|
|
|
elif toknum == DEDENT:
|
|
|
indents.pop()
|
|
|
continue
|
|
|
elif toknum in (NEWLINE, NL):
|
|
|
startline = True
|
|
|
elif startline and indents:
|
|
|
toks_append(indents[-1])
|
|
|
startline = False
|
|
|
toks_append(tokval)
|
|
|
|
|
|
|
|
|
def untokenize(tokens):
|
|
|
"""
|
|
|
Convert ``tokens`` (an iterable) back into Python source code. Return
|
|
|
a bytes object, encoded using the encoding specified by the last
|
|
|
ENCODING token in ``tokens``, or UTF-8 if no ENCODING token is found.
|
|
|
|
|
|
The result is guaranteed to tokenize back to match the input so that
|
|
|
the conversion is lossless and round-trips are assured. The
|
|
|
guarantee applies only to the token type and token string as the
|
|
|
spacing between tokens (column positions) may change.
|
|
|
|
|
|
:func:`untokenize` has two modes. If the input tokens are sequences
|
|
|
of length 2 (``type``, ``string``) then spaces are added as necessary to
|
|
|
preserve the round-trip property.
|
|
|
|
|
|
If the input tokens are sequences of length 4 or more (``type``,
|
|
|
``string``, ``start``, ``end``), as returned by :func:`tokenize`, then
|
|
|
spaces are added so that each token appears in the result at the
|
|
|
position indicated by ``start`` and ``end``, if possible.
|
|
|
"""
|
|
|
return Untokenizer().untokenize(tokens)
|
|
|
|
|
|
|
|
|
def _get_normal_name(orig_enc):
|
|
|
"""Imitates get_normal_name in tokenizer.c."""
|
|
|
# Only care about the first 12 characters.
|
|
|
enc = orig_enc[:12].lower().replace("_", "-")
|
|
|
if enc == "utf-8" or enc.startswith("utf-8-"):
|
|
|
return "utf-8"
|
|
|
if enc in ("latin-1", "iso-8859-1", "iso-latin-1") or \
|
|
|
enc.startswith(("latin-1-", "iso-8859-1-", "iso-latin-1-")):
|
|
|
return "iso-8859-1"
|
|
|
return orig_enc
|
|
|
|
|
|
def detect_encoding(readline):
|
|
|
"""
|
|
|
The detect_encoding() function is used to detect the encoding that should
|
|
|
be used to decode a Python source file. It requires one argment, readline,
|
|
|
in the same way as the tokenize() generator.
|
|
|
|
|
|
It will call readline a maximum of twice, and return the encoding used
|
|
|
(as a string) and a list of any lines (left as bytes) it has read in.
|
|
|
|
|
|
It detects the encoding from the presence of a utf-8 bom or an encoding
|
|
|
cookie as specified in pep-0263. If both a bom and a cookie are present,
|
|
|
but disagree, a SyntaxError will be raised. If the encoding cookie is an
|
|
|
invalid charset, raise a SyntaxError. Note that if a utf-8 bom is found,
|
|
|
'utf-8-sig' is returned.
|
|
|
|
|
|
If no encoding is specified, then the default of 'utf-8' will be returned.
|
|
|
"""
|
|
|
bom_found = False
|
|
|
encoding = None
|
|
|
default = 'utf-8'
|
|
|
def read_or_stop():
|
|
|
try:
|
|
|
return readline()
|
|
|
except StopIteration:
|
|
|
return b''
|
|
|
|
|
|
def find_cookie(line):
|
|
|
try:
|
|
|
# Decode as UTF-8. Either the line is an encoding declaration,
|
|
|
# in which case it should be pure ASCII, or it must be UTF-8
|
|
|
# per default encoding.
|
|
|
line_string = line.decode('utf-8')
|
|
|
except UnicodeDecodeError:
|
|
|
raise SyntaxError("invalid or missing encoding declaration")
|
|
|
|
|
|
matches = cookie_re.findall(line_string)
|
|
|
if not matches:
|
|
|
return None
|
|
|
encoding = _get_normal_name(matches[0])
|
|
|
try:
|
|
|
codec = lookup(encoding)
|
|
|
except LookupError:
|
|
|
# This behaviour mimics the Python interpreter
|
|
|
raise SyntaxError("unknown encoding: " + encoding)
|
|
|
|
|
|
if bom_found:
|
|
|
if encoding != 'utf-8':
|
|
|
# This behaviour mimics the Python interpreter
|
|
|
raise SyntaxError('encoding problem: utf-8')
|
|
|
encoding += '-sig'
|
|
|
return encoding
|
|
|
|
|
|
first = read_or_stop()
|
|
|
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 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.
|
|
|
"""
|
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# This import is here to avoid problems when the itertools module is not
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# built yet and tokenize is imported.
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from itertools import chain, repeat
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encoding, consumed = detect_encoding(readline)
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rl_gen = iter(readline, b"")
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empty = repeat(b"")
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return _tokenize(chain(consumed, rl_gen, empty).__next__, encoding)
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def _tokenize(readline, encoding):
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lnum = parenlev = continued = 0
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numchars = '0123456789'
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contstr, needcont = '', 0
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contline = None
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indents = [0]
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if encoding is not None:
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if encoding == "utf-8-sig":
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# BOM will already have been stripped.
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encoding = "utf-8"
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yield TokenInfo(ENCODING, encoding, (0, 0), (0, 0), '')
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while True: # 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 = b''
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if encoding is not None:
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line = line.decode(encoding)
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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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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 TokenInfo(STRING, contstr + line[:end],
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strstart, (lnum, end), contline + line)
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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 TokenInfo(ERRORTOKEN, contstr + line,
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strstart, (lnum, len(line)), contline)
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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: 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 line[pos] in '#\r\n': # skip comments or blank lines
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if line[pos] == '#':
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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 TokenInfo(COMMENT, comment_token,
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(lnum, pos), (lnum, pos + len(comment_token)), line)
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yield TokenInfo(NEWLINE, line[nl_pos:],
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(lnum, nl_pos), (lnum, len(line)), line)
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else:
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yield TokenInfo(NEWLINE, line[pos:],
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(lnum, pos), (lnum, len(line)), line)
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continue
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if column > indents[-1]: # count indents or dedents
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indents.append(column)
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yield TokenInfo(INDENT, line[:pos], (lnum, 0), (lnum, pos), line)
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while column < indents[-1]:
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if column not in indents:
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raise IndentationError(
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"unindent does not match any outer indentation level",
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("<tokenize>", lnum, pos, line))
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indents = indents[:-1]
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yield TokenInfo(DEDENT, '', (lnum, pos), (lnum, pos), line)
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else: # continued statement
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if not line:
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raise TokenError("EOF in multi-line statement", (lnum, 0))
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continued = 0
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while pos < max:
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pseudomatch = pseudoprog.match(line, pos)
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if pseudomatch: # scan for tokens
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start, end = pseudomatch.span(1)
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spos, epos, pos = (lnum, start), (lnum, end), end
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token, initial = line[start:end], line[start]
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if (initial in numchars or # ordinary number
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(initial == '.' and token != '.' and token != '...')):
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yield TokenInfo(NUMBER, token, spos, epos, line)
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elif initial in '\r\n':
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yield TokenInfo(NL if parenlev > 0 else NEWLINE,
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token, spos, epos, line)
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elif initial == '#':
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assert not token.endswith("\n")
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yield TokenInfo(COMMENT, token, spos, epos, line)
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elif token in triple_quoted:
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endprog = endprogs[token]
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endmatch = endprog.match(line, pos)
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if endmatch: # all on one line
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pos = endmatch.end(0)
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token = line[start:pos]
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yield TokenInfo(STRING, token, spos, (lnum, pos), line)
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else:
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strstart = (lnum, start) # multiple lines
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contstr = line[start:]
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contline = line
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break
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elif initial in single_quoted or \
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token[:2] in single_quoted or \
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token[:3] in single_quoted:
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if token[-1] == '\n': # continued string
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strstart = (lnum, start)
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endprog = (endprogs[initial] or endprogs[token[1]] or
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endprogs[token[2]])
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contstr, needcont = line[start:], 1
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contline = line
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break
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else: # ordinary string
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yield TokenInfo(STRING, token, spos, epos, line)
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elif initial.isidentifier(): # ordinary name
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yield TokenInfo(NAME, token, spos, epos, line)
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elif initial == '\\': # continued stmt
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continued = 1
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else:
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if initial in '([{':
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parenlev += 1
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elif initial in ')]}':
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parenlev -= 1
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yield TokenInfo(OP, token, spos, epos, line)
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else:
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yield TokenInfo(ERRORTOKEN, line[pos],
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(lnum, pos), (lnum, pos+1), line)
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pos += 1
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for indent in indents[1:]: # pop remaining indent levels
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yield TokenInfo(DEDENT, '', (lnum, 0), (lnum, 0), '')
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yield TokenInfo(ENDMARKER, '', (lnum, 0), (lnum, 0), '')
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# An undocumented, backwards compatible, API for all the places in the standard
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# library that expect to be able to use tokenize with strings
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def generate_tokens(readline):
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return _tokenize(readline, None)
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if __name__ == "__main__":
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# Quick sanity check
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|
s = b'''def parseline(self, line):
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|
"""Parse the line into a command name and a string containing
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the arguments. Returns a tuple containing (command, args, line).
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|
'command' and 'args' may be None if the line couldn't be parsed.
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"""
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line = line.strip()
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|
if not line:
|
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|
return None, None, line
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|
|
elif line[0] == '?':
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|
line = 'help ' + line[1:]
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|
elif line[0] == '!':
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if hasattr(self, 'do_shell'):
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line = 'shell ' + line[1:]
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else:
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return None, None, line
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i, n = 0, len(line)
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while i < n and line[i] in self.identchars: i = i+1
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cmd, arg = line[:i], line[i:].strip()
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return cmd, arg, line
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'''
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|
|
for tok in tokenize(iter(s.splitlines()).__next__):
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print(tok)
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