forked from VimPlug/jedi
305 lines
12 KiB
Python
305 lines
12 KiB
Python
"""
|
|
This tokenizer has been copied from the ``tokenize.py`` standard library
|
|
tokenizer. The reason was simple: The standanrd library tokenizer fails
|
|
if the indentation is not right. The fast parser of jedi however requires
|
|
"wrong" indentation.
|
|
|
|
Tokenization help for Python programs.
|
|
++++++++++++++++++++++++++++++++++++++
|
|
|
|
tokenize(readline) is a generator that breaks a stream of bytes into
|
|
Python tokens. It decodes the bytes according to PEP-0263 for
|
|
determining source file encoding.
|
|
|
|
It accepts a readline-like method which is called repeatedly to get the
|
|
next line of input (or b"" for EOF). It generates 5-tuples with these
|
|
members:
|
|
|
|
the token type (see token.py)
|
|
the token (a string)
|
|
the starting (row, column) indices of the token (a 2-tuple of ints)
|
|
the ending (row, column) indices of the token (a 2-tuple of ints)
|
|
the original line (string)
|
|
|
|
It is designed to match the working of the Python tokenizer exactly, except
|
|
that it produces COMMENT tokens for comments and gives type OP for all
|
|
operators. Additionally, all token lists start with an ENCODING token
|
|
which tells you which encoding was used to decode the bytes stream.
|
|
"""
|
|
|
|
import string
|
|
import re
|
|
from token import *
|
|
from codecs import lookup, BOM_UTF8
|
|
import collections
|
|
cookie_re = re.compile("coding[:=]\s*([-\w.]+)")
|
|
|
|
namechars = string.ascii_letters + '_'
|
|
|
|
|
|
COMMENT = N_TOKENS
|
|
tok_name[COMMENT] = 'COMMENT'
|
|
NL = N_TOKENS + 1
|
|
tok_name[NL] = 'NL'
|
|
ENCODING = N_TOKENS + 2
|
|
tok_name[ENCODING] = 'ENCODING'
|
|
N_TOKENS += 3
|
|
|
|
class TokenInfo(collections.namedtuple('TokenInfo', 'type string start end line')):
|
|
def __repr__(self):
|
|
annotated_type = '%d (%s)' % (self.type, tok_name[self.type])
|
|
return ('TokenInfo(type=%s, string=%r, start=%r, end=%r, line=%r)' %
|
|
self._replace(type=annotated_type))
|
|
|
|
def group(*choices): return '(' + '|'.join(choices) + ')'
|
|
def any(*choices): return group(*choices) + '*'
|
|
def maybe(*choices): return group(*choices) + '?'
|
|
|
|
# Note: we use unicode matching for names ("\w") but ascii matching for
|
|
# number literals.
|
|
Whitespace = r'[ \f\t]*'
|
|
Comment = r'#[^\r\n]*'
|
|
Ignore = Whitespace + any(r'\\\r?\n' + Whitespace) + maybe(Comment)
|
|
Name = r'\w+'
|
|
|
|
Hexnumber = r'0[xX][0-9a-fA-F]+'
|
|
Binnumber = r'0[bB][01]+'
|
|
Octnumber = r'0[oO][0-7]+'
|
|
Decnumber = r'(?:0+|[1-9][0-9]*)'
|
|
Intnumber = group(Hexnumber, Binnumber, Octnumber, Decnumber)
|
|
Exponent = r'[eE][-+]?[0-9]+'
|
|
Pointfloat = group(r'[0-9]+\.[0-9]*', r'\.[0-9]+') + maybe(Exponent)
|
|
Expfloat = r'[0-9]+' + Exponent
|
|
Floatnumber = group(Pointfloat, Expfloat)
|
|
Imagnumber = group(r'[0-9]+[jJ]', Floatnumber + r'[jJ]')
|
|
Number = group(Imagnumber, Floatnumber, Intnumber)
|
|
|
|
# Tail end of ' string.
|
|
Single = r"[^'\\]*(?:\\.[^'\\]*)*'"
|
|
# Tail end of " string.
|
|
Double = r'[^"\\]*(?:\\.[^"\\]*)*"'
|
|
# Tail end of ''' string.
|
|
Single3 = r"[^'\\]*(?:(?:\\.|'(?!''))[^'\\]*)*'''"
|
|
# Tail end of """ string.
|
|
Double3 = r'[^"\\]*(?:(?:\\.|"(?!""))[^"\\]*)*"""'
|
|
Triple = group("[bB]?[rR]?'''", '[bB]?[rR]?"""')
|
|
# Single-line ' or " string.
|
|
String = group(r"[bB]?[rR]?'[^\n'\\]*(?:\\.[^\n'\\]*)*'",
|
|
r'[bB]?[rR]?"[^\n"\\]*(?:\\.[^\n"\\]*)*"')
|
|
|
|
# Because of leftmost-then-longest match semantics, be sure to put the
|
|
# longest operators first (e.g., if = came before ==, == would get
|
|
# recognized as two instances of =).
|
|
Operator = group(r"\*\*=?", r">>=?", r"<<=?", r"!=",
|
|
r"//=?", r"->",
|
|
r"[+\-*/%&|^=<>]=?",
|
|
r"~")
|
|
|
|
Bracket = '[][(){}]'
|
|
Special = group(r'\r?\n', r'\.\.\.', r'[:;.,@]')
|
|
Funny = group(Operator, Bracket, Special)
|
|
|
|
PlainToken = group(Number, Funny, String, Name)
|
|
Token = Ignore + PlainToken
|
|
|
|
# First (or only) line of ' or " string.
|
|
ContStr = group(r"[bB]?[rR]?'[^\n'\\]*(?:\\.[^\n'\\]*)*" +
|
|
group("'", r'\\\r?\n'),
|
|
r'[bB]?[rR]?"[^\n"\\]*(?:\\.[^\n"\\]*)*' +
|
|
group('"', r'\\\r?\n'))
|
|
PseudoExtras = group(r'\\\r?\n', Comment, Triple)
|
|
PseudoToken = Whitespace + group(PseudoExtras, Number, Funny, ContStr, Name)
|
|
|
|
def _compile(expr):
|
|
return re.compile(expr, re.UNICODE)
|
|
|
|
tokenprog, pseudoprog, single3prog, double3prog = map(
|
|
_compile, (Token, PseudoToken, Single3, Double3))
|
|
endprogs = {"'": _compile(Single), '"': _compile(Double),
|
|
"'''": single3prog, '"""': double3prog,
|
|
"r'''": single3prog, 'r"""': double3prog,
|
|
"b'''": single3prog, 'b"""': double3prog,
|
|
"br'''": single3prog, 'br"""': double3prog,
|
|
"R'''": single3prog, 'R"""': double3prog,
|
|
"B'''": single3prog, 'B"""': double3prog,
|
|
"bR'''": single3prog, 'bR"""': double3prog,
|
|
"Br'''": single3prog, 'Br"""': double3prog,
|
|
"BR'''": single3prog, 'BR"""': double3prog,
|
|
'r': None, 'R': None, 'b': None, 'B': None}
|
|
|
|
triple_quoted = {}
|
|
for t in ("'''", '"""',
|
|
"r'''", 'r"""', "R'''", 'R"""',
|
|
"b'''", 'b"""', "B'''", 'B"""',
|
|
"br'''", 'br"""', "Br'''", 'Br"""',
|
|
"bR'''", 'bR"""', "BR'''", 'BR"""'):
|
|
triple_quoted[t] = t
|
|
single_quoted = {}
|
|
for t in ("'", '"',
|
|
"r'", 'r"', "R'", 'R"',
|
|
"b'", 'b"', "B'", 'B"',
|
|
"br'", 'br"', "Br'", 'Br"',
|
|
"bR'", 'bR"', "BR'", 'BR"' ):
|
|
single_quoted[t] = t
|
|
|
|
del _compile
|
|
|
|
tabsize = 8
|
|
|
|
class TokenError(Exception): pass
|
|
|
|
|
|
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(NL, line[nl_pos:],
|
|
(lnum, nl_pos), (lnum, len(line)), line)
|
|
else:
|
|
yield TokenInfo((NL, COMMENT)[line[pos] == '#'], 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 in namechars: # 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)
|