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
|
#!/usr/bin/python
# -*- coding: utf-8 -*-
"""
Lexing error finder
~~~~~~~~~~~~~~~~~~~
For the source files given on the command line, display
the text where Error tokens are being generated, along
with some context.
:copyright: Copyright 2006-2014 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from __future__ import print_function
import os
import sys
# always prefer Pygments from source if exists
srcpath = os.path.join(os.path.dirname(__file__), '..')
if os.path.isdir(os.path.join(srcpath, 'pygments')):
sys.path.insert(0, srcpath)
from pygments.lexer import RegexLexer, ExtendedRegexLexer, LexerContext, \
ProfilingRegexLexer, ProfilingRegexLexerMeta
from pygments.lexers import get_lexer_by_name, find_lexer_class, \
find_lexer_class_for_filename
from pygments.token import Error, Text, _TokenType
from pygments.cmdline import _parse_options
class DebuggingRegexLexer(ExtendedRegexLexer):
"""Make the state stack, position and current match instance attributes."""
def get_tokens_unprocessed(self, text, stack=('root',)):
"""
Split ``text`` into (tokentype, text) pairs.
``stack`` is the inital stack (default: ``['root']``)
"""
tokendefs = self._tokens
self.ctx = ctx = LexerContext(text, 0)
ctx.stack = list(stack)
statetokens = tokendefs[ctx.stack[-1]]
while 1:
for rexmatch, action, new_state in statetokens:
self.m = m = rexmatch(text, ctx.pos, ctx.end)
if m:
if action is not None:
if type(action) is _TokenType:
yield ctx.pos, action, m.group()
ctx.pos = m.end()
else:
if not isinstance(self, ExtendedRegexLexer):
for item in action(self, m):
yield item
ctx.pos = m.end()
else:
for item in action(self, m, ctx):
yield item
if not new_state:
# altered the state stack?
statetokens = tokendefs[ctx.stack[-1]]
if new_state is not None:
# state transition
if isinstance(new_state, tuple):
for state in new_state:
if state == '#pop':
ctx.stack.pop()
elif state == '#push':
ctx.stack.append(ctx.stack[-1])
else:
ctx.stack.append(state)
elif isinstance(new_state, int):
# pop
del ctx.stack[new_state:]
elif new_state == '#push':
ctx.stack.append(ctx.stack[-1])
else:
assert False, 'wrong state def: %r' % new_state
statetokens = tokendefs[ctx.stack[-1]]
break
else:
try:
if ctx.pos >= ctx.end:
break
if text[ctx.pos] == '\n':
# at EOL, reset state to 'root'
ctx.stack = ['root']
statetokens = tokendefs['root']
yield ctx.pos, Text, u'\n'
ctx.pos += 1
continue
yield ctx.pos, Error, text[ctx.pos]
ctx.pos += 1
except IndexError:
break
def main(fn, lexer=None, options={}):
if lexer is not None:
lxcls = get_lexer_by_name(lexer).__class__
else:
lxcls = find_lexer_class_for_filename(os.path.basename(fn))
if lxcls is None:
name, rest = fn.split('_', 1)
lxcls = find_lexer_class(name)
if lxcls is None:
raise AssertionError('no lexer found for file %r' % fn)
debug_lexer = False
if profile:
# does not work for e.g. ExtendedRegexLexers
if lxcls.__bases__ == (RegexLexer,):
# yes we can! (change the metaclass)
lxcls.__class__ = ProfilingRegexLexerMeta
lxcls.__bases__ = (ProfilingRegexLexer,)
lxcls._prof_sort_index = profsort
else:
if lxcls.__bases__ == (RegexLexer,):
lxcls.__bases__ = (DebuggingRegexLexer,)
debug_lexer = True
elif lxcls.__bases__ == (DebuggingRegexLexer,):
# already debugged before
debug_lexer = True
else:
# HACK: ExtendedRegexLexer subclasses will only partially work here.
lxcls.__bases__ = (DebuggingRegexLexer,)
debug_lexer = True
lx = lxcls(**options)
lno = 1
if fn == '-':
text = sys.stdin.read()
else:
with open(fn, 'rb') as fp:
text = fp.read().decode('utf-8')
text = text.strip('\n') + '\n'
tokens = []
states = []
def show_token(tok, state):
reprs = list(map(repr, tok))
print(' ' + reprs[1] + ' ' + ' ' * (29-len(reprs[1])) + reprs[0], end=' ')
if debug_lexer:
print(' ' + ' ' * (29-len(reprs[0])) + ' : '.join(state), end=' ')
print()
for type, val in lx.get_tokens(text):
lno += val.count('\n')
if type == Error:
print('Error parsing', fn, 'on line', lno)
print('Previous tokens' + (debug_lexer and ' and states' or '') + ':')
if showall:
for tok, state in map(None, tokens, states):
show_token(tok, state)
else:
for i in range(max(len(tokens) - num, 0), len(tokens)):
if debug_lexer:
show_token(tokens[i], states[i])
else:
show_token(tokens[i], None)
print('Error token:')
l = len(repr(val))
print(' ' + repr(val), end=' ')
if debug_lexer and hasattr(lx, 'ctx'):
print(' ' * (60-l) + ' : '.join(lx.ctx.stack), end=' ')
print()
print()
return 1
tokens.append((type, val))
if debug_lexer:
if hasattr(lx, 'ctx'):
states.append(lx.ctx.stack[:])
else:
states.append(None)
if showall:
for tok, state in zip(tokens, states):
show_token(tok, state)
return 0
def print_help():
print('''\
Pygments development helper to quickly debug lexers.
scripts/debug_lexer.py [options] file ...
Give one or more filenames to lex them and display possible error tokens
and/or profiling info. Files are assumed to be encoded in UTF-8.
Selecting lexer and options:
-l NAME use lexer named NAME (default is to guess from
the given filenames)
-O OPTIONSTR use lexer options parsed from OPTIONSTR
Debugging lexing errors:
-n N show the last N tokens on error
-a always show all lexed tokens (default is only
to show them when an error occurs)
Profiling:
-p use the ProfilingRegexLexer to profile regexes
instead of the debugging lexer
-s N sort profiling output by column N (default is
column 4, the time per call)
''')
num = 10
showall = False
lexer = None
options = {}
profile = False
profsort = 4
if __name__ == '__main__':
import getopt
opts, args = getopt.getopt(sys.argv[1:], 'n:l:apO:s:h')
for opt, val in opts:
if opt == '-n':
num = int(val)
elif opt == '-a':
showall = True
elif opt == '-l':
lexer = val
elif opt == '-p':
profile = True
elif opt == '-s':
profsort = int(val)
elif opt == '-O':
options = _parse_options([val])
elif opt == '-h':
print_help()
sys.exit(0)
ret = 0
if not args:
print_help()
for f in args:
ret += main(f, lexer, options)
sys.exit(bool(ret))
|
