forked from DonJayamanne/pythonVSCode
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathtokenize.py
More file actions
executable file
·290 lines (250 loc) · 10.6 KB
/
tokenize.py
File metadata and controls
executable file
·290 lines (250 loc) · 10.6 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
# -*- coding: utf-8 -*-
"""
This tokenizer has been copied from the ``tokenize.py`` standard library
tokenizer. The reason was simple: The standard library tokenizer fails
if the indentation is not right. The fast parser of jedi however requires
"wrong" indentation.
Basically this is a stripped down version of the standard library module, so
you can read the documentation there. Additionally we included some speed and
memory optimizations here.
"""
from __future__ import absolute_import
import string
import re
from io import StringIO
from jedi.parser.token import (tok_name, N_TOKENS, ENDMARKER, STRING, NUMBER,
NAME, OP, ERRORTOKEN, NEWLINE, INDENT, DEDENT)
from jedi._compatibility import is_py3
cookie_re = re.compile("coding[:=]\s*([-\w.]+)")
if is_py3:
# Python 3 has str.isidentifier() to check if a char is a valid identifier
is_identifier = str.isidentifier
else:
namechars = string.ascii_letters + '_'
is_identifier = lambda s: s in namechars
COMMENT = N_TOKENS
tok_name[COMMENT] = 'COMMENT'
def group(*choices):
return '(' + '|'.join(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]*'
name = r'\w+'
hex_number = r'0[xX][0-9a-fA-F]+'
bin_number = r'0[bB][01]+'
oct_number = r'0[oO][0-7]+'
dec_number = r'(?:0+|[1-9][0-9]*)'
int_number = group(hex_number, bin_number, oct_number, dec_number)
exponent = r'[eE][-+]?[0-9]+'
point_float = group(r'[0-9]+\.[0-9]*', r'\.[0-9]+') + maybe(exponent)
Expfloat = r'[0-9]+' + exponent
float_number = group(point_float, Expfloat)
imag_number = group(r'[0-9]+[jJ]', float_number + r'[jJ]')
number = group(imag_number, float_number, int_number)
# 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("[uUbB]?[rR]?'''", '[uUbB]?[rR]?"""')
# Single-line ' or " string.
# 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)
# First (or only) line of ' or " string.
cont_str = group(r"[bBuU]?[rR]?'[^\n'\\]*(?:\\.[^\n'\\]*)*" +
group("'", r'\\\r?\n'),
r'[bBuU]?[rR]?"[^\n"\\]*(?:\\.[^\n"\\]*)*' +
group('"', r'\\\r?\n'))
pseudo_extras = group(r'\\\r?\n', comment, triple)
pseudo_token = group(whitespace) + \
group(pseudo_extras, number, funny, cont_str, name)
def _compile(expr):
return re.compile(expr, re.UNICODE)
pseudoprog, single3prog, double3prog = map(
_compile, (pseudo_token, single3, double3))
endprogs = {"'": _compile(single), '"': _compile(double),
"'''": single3prog, '"""': double3prog,
"r'''": single3prog, 'r"""': double3prog,
"b'''": single3prog, 'b"""': double3prog,
"u'''": single3prog, 'u"""': double3prog,
"R'''": single3prog, 'R"""': double3prog,
"B'''": single3prog, 'B"""': double3prog,
"U'''": single3prog, 'U"""': double3prog,
"br'''": single3prog, 'br"""': double3prog,
"bR'''": single3prog, 'bR"""': double3prog,
"Br'''": single3prog, 'Br"""': double3prog,
"BR'''": single3prog, 'BR"""': double3prog,
"ur'''": single3prog, 'ur"""': double3prog,
"uR'''": single3prog, 'uR"""': double3prog,
"Ur'''": single3prog, 'Ur"""': double3prog,
"UR'''": single3prog, 'UR"""': double3prog,
'r': None, 'R': None, 'b': None, 'B': None}
triple_quoted = {}
for t in ("'''", '"""',
"r'''", 'r"""', "R'''", 'R"""',
"b'''", 'b"""', "B'''", 'B"""',
"u'''", 'u"""', "U'''", 'U"""',
"br'''", 'br"""', "Br'''", 'Br"""',
"bR'''", 'bR"""', "BR'''", 'BR"""',
"ur'''", 'ur"""', "Ur'''", 'Ur"""',
"uR'''", 'uR"""', "UR'''", 'UR"""'):
triple_quoted[t] = t
single_quoted = {}
for t in ("'", '"',
"r'", 'r"', "R'", 'R"',
"b'", 'b"', "B'", 'B"',
"u'", 'u"', "U'", 'U"',
"br'", 'br"', "Br'", 'Br"',
"bR'", 'bR"', "BR'", 'BR"',
"ur'", 'ur"', "Ur'", 'Ur"',
"uR'", 'uR"', "UR'", 'UR"'):
single_quoted[t] = t
del _compile
tabsize = 8
ALWAYS_BREAK_TOKENS = (';', 'import', 'from', 'class', 'def', 'try', 'except',
'finally', 'while', 'return')
def source_tokens(source):
"""Generate tokens from a the source code (string)."""
source = source + '\n' # end with \n, because the parser needs it
readline = StringIO(source).readline
return generate_tokens(readline)
def generate_tokens(readline):
"""
A heavily modified Python standard library tokenizer.
Additionally to the default information, yields also the prefix of each
token. This idea comes from lib2to3. The prefix contains all information
that is irrelevant for the parser like newlines in parentheses or comments.
"""
paren_level = 0 # count parentheses
indents = [0]
lnum = 0
numchars = '0123456789'
contstr = ''
contline = None
# We start with a newline. This makes indent at the first position
# possible. It's not valid Python, but still better than an INDENT in the
# second line (and not in the first). This makes quite a few things in
# Jedi's fast parser possible.
new_line = True
prefix = '' # Should never be required, but here for safety
additional_prefix = ''
while True: # loop over lines in stream
line = readline() # readline returns empty when finished. See StringIO
if not line:
if contstr:
yield ERRORTOKEN, contstr, contstr_start, prefix
break
lnum += 1
pos, max = 0, len(line)
if contstr: # continued string
endmatch = endprog.match(line)
if endmatch:
pos = endmatch.end(0)
yield STRING, contstr + line[:pos], contstr_start, prefix
contstr = ''
contline = None
else:
contstr = contstr + line
contline = contline + line
continue
while pos < max:
pseudomatch = pseudoprog.match(line, pos)
if not pseudomatch: # scan for tokens
txt = line[pos]
if line[pos] in '"\'':
# If a literal starts but doesn't end the whole rest of the
# line is an error token.
txt = line[pos:]
yield ERRORTOKEN, txt, (lnum, pos), prefix
pos += 1
continue
prefix = additional_prefix + pseudomatch.group(1)
additional_prefix = ''
start, pos = pseudomatch.span(2)
spos = (lnum, start)
token, initial = line[start:pos], line[start]
if new_line and initial not in '\r\n#':
new_line = False
if paren_level == 0:
if start > indents[-1]:
yield INDENT, '', spos, ''
indents.append(start)
while start < indents[-1]:
yield DEDENT, '', spos, ''
indents.pop()
if (initial in numchars or # ordinary number
(initial == '.' and token != '.' and token != '...')):
yield NUMBER, token, spos, prefix
elif initial in '\r\n':
if not new_line and paren_level == 0:
yield NEWLINE, token, spos, prefix
else:
additional_prefix = prefix + token
new_line = True
elif initial == '#': # Comments
assert not token.endswith("\n")
additional_prefix = prefix + token
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 STRING, token, spos, prefix
else:
contstr_start = (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
contstr_start = lnum, start
endprog = (endprogs.get(initial) or endprogs.get(token[1])
or endprogs.get(token[2]))
contstr = line[start:]
contline = line
break
else: # ordinary string
yield STRING, token, spos, prefix
elif is_identifier(initial): # ordinary name
if token in ALWAYS_BREAK_TOKENS:
paren_level = 0
while True:
indent = indents.pop()
if indent > start:
yield DEDENT, '', spos, ''
else:
indents.append(indent)
break
yield NAME, token, spos, prefix
elif initial == '\\' and line[start:] in ('\\\n', '\\\r\n'): # continued stmt
additional_prefix += prefix + line[start:]
break
else:
if token in '([{':
paren_level += 1
elif token in ')]}':
paren_level -= 1
yield OP, token, spos, prefix
end_pos = (lnum, max - 1)
# As the last position we just take the maximally possible position. We
# remove -1 for the last new line.
for indent in indents[1:]:
yield DEDENT, '', end_pos, ''
yield ENDMARKER, '', end_pos, prefix