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
|
cdef class Match:
cdef readonly Pattern re
cdef readonly object string
cdef readonly int pos
cdef readonly int endpos
cdef readonly tuple regs
cdef StringPiece * matches
cdef int encoded
cdef int nmatches
cdef int _lastindex
cdef tuple _groups
cdef dict _named_groups
property lastindex:
def __get__(self):
return None if self._lastindex < 1 else self._lastindex
property lastgroup:
def __get__(self):
if self._lastindex < 1:
return None
for name, n in self.re.groupindex.items():
if n == self._lastindex:
return name
return None
def __init__(self, Pattern pattern_object, int num_groups):
self._lastindex = -1
self._groups = None
self.pos = 0
self.endpos = -1
self.matches = new_StringPiece_array(num_groups + 1)
self.nmatches = num_groups
self.re = pattern_object
cdef _init_groups(self):
cdef list groups = []
cdef int i
cdef const char * last_end = NULL
cdef const char * cur_end = NULL
for i in range(self.nmatches):
if self.matches[i].data() == NULL:
groups.append(None)
else:
if i > 0:
cur_end = self.matches[i].data() + self.matches[i].length()
if last_end == NULL:
last_end = cur_end
self._lastindex = i
else:
# The rules for last group are a bit complicated:
# if two groups end at the same point, the earlier one
# is considered last, so we don't switch our selection
# unless the end point has moved.
if cur_end > last_end:
last_end = cur_end
self._lastindex = i
groups.append(
self.matches[i].data()[:self.matches[i].length()])
self._groups = tuple(groups)
cdef bytes _group(self, object groupnum):
cdef int idx
if isinstance(groupnum, int):
idx = groupnum
if idx > self.nmatches - 1:
raise IndexError("no such group %d; available groups: %r"
% (idx, list(range(self.nmatches))))
return self._groups[idx]
groupdict = self._groupdict()
if groupnum not in groupdict:
raise IndexError("no such group %r; available groups: %r"
% (groupnum, list(groupdict)))
return groupdict[groupnum]
cdef dict _groupdict(self):
if self._named_groups is None:
self._named_groups = {name: self._groups[n]
for name, n in self.re.groupindex.items()}
return self._named_groups
def groups(self, default=None):
if self.encoded:
return tuple([default if g is None else g.decode('utf8')
for g in self._groups[1:]])
return tuple([default if g is None else g
for g in self._groups[1:]])
def group(self, *args):
if len(args) == 0:
groupnum = 0
elif len(args) == 1:
groupnum = args[0]
else: # len(args) > 1:
return tuple([self.group(i) for i in args])
if self.encoded:
result = self._group(groupnum)
return None if result is None else result.decode('utf8')
return self._group(groupnum)
def groupdict(self):
result = self._groupdict()
if self.encoded:
return {a: None if b is None else b.decode('utf8')
for a, b in result.items()}
return result
def expand(self, object template):
"""Expand a template with groups."""
cdef bytearray result = bytearray()
if isinstance(template, unicode):
if not PY2 and not self.encoded:
raise ValueError(
'cannot expand unicode template on bytes pattern')
templ = template.encode('utf8')
else:
if not PY2 and self.encoded:
raise ValueError(
'cannot expand bytes template on unicode pattern')
templ = bytes(template)
self._expand(templ, result)
return result.decode('utf8') if self.encoded else bytes(result)
cdef _expand(self, bytes templ, bytearray result):
"""Expand template by appending to an existing bytearray.
Everything remains UTF-8 encoded."""
cdef char * cstring
cdef int n = 0, prev = 0, size
# NB: cstring is used to get single characters, to avoid difference in
# Python 2/3 behavior of bytes objects.
cstring = templ
size = len(templ)
while True:
prev = n
n = templ.find(b'\\', prev)
if n == -1:
result.extend(templ[prev:])
break
result.extend(templ[prev:n])
n += 1
if (n + 2 < size and cstring[n] == b'x'
and ishex(cstring[n + 1]) and ishex(cstring[n + 2])):
# hex char reference \x1f
result.append(int(templ[n + 1:n + 3], base=16) & 255)
n += 3
elif (n + 2 < size and isoct(cstring[n]) and isoct(cstring[n + 1])
and isoct(cstring[n + 2])):
# octal char reference \123
result.append(int(templ[n:n + 3], base=8) & 255)
n += 3
elif cstring[n] == b'0':
if n + 1 < size and isoct(cstring[n + 1]):
# 2 character octal: \01
result.append(int(templ[n:n + 2], base=8))
n += 2
else: # nul-terminator literal \0
result.append(b'\0')
n += 1
elif b'0' <= cstring[n] <= b'9': # numeric group reference
if n + 1 < size and isdigit(cstring[n + 1]):
# 2 digit group ref \12
groupno = int(templ[n:n + 2])
n += 2
else:
# 1 digit group ref \1
groupno = int(templ[n:n + 1])
n += 1
if groupno <= self.re.groups:
groupval = self._group(groupno)
if groupval is not None:
result.extend(groupval)
else:
raise RegexError('invalid group reference.')
elif cstring[n] == b'g': # named group reference
n += 1
if n >= size or cstring[n] != b'<':
raise RegexError('missing group name')
n += 1
start = n
while cstring[n] != b'>':
if not isident(cstring[n]):
raise RegexError('bad character in group name')
n += 1
if n >= size:
raise RegexError('unterminated group name')
if templ[start:n].isdigit():
name = int(templ[start:n])
elif isdigit(cstring[start]):
raise RegexError('bad character in group name')
else:
name = templ[start:n]
if self.encoded:
name = name.decode('utf8')
groupval = self._group(name)
if groupval is not None:
result.extend(groupval)
n += 1
else:
if cstring[n] == b'n':
result.append(b'\n')
elif cstring[n] == b'r':
result.append(b'\r')
elif cstring[n] == b't':
result.append(b'\t')
elif cstring[n] == b'v':
result.append(b'\v')
elif cstring[n] == b'f':
result.append(b'\f')
elif cstring[n] == b'a':
result.append(b'\a')
elif cstring[n] == b'b':
result.append(b'\b')
elif cstring[n] == b'\\':
result.append(b'\\')
else: # copy verbatim
result.append(b'\\')
result.append(cstring[n])
n += 1
return bytes(result)
def start(self, group=0):
return self.span(group)[0]
def end(self, group=0):
return self.span(group)[1]
def span(self, group=0):
if isinstance(group, int):
if group > len(self.regs):
raise IndexError("no such group %d; available groups: %r"
% (group, list(range(len(self.regs)))))
return self.regs[group]
else:
self._groupdict()
if group not in self.re.groupindex:
raise IndexError("no such group %r; available groups: %r"
% (group, list(self.re.groupindex)))
return self.regs[self.re.groupindex[group]]
cdef _make_spans(self, char * cstring, int size, int * cpos, int * upos):
cdef int start, end
cdef StringPiece * piece
spans = []
for i in range(self.nmatches):
if self.matches[i].data() == NULL:
spans.append((-1, -1))
else:
piece = &self.matches[i]
if piece.data() == NULL:
return (-1, -1)
start = piece.data() - cstring
end = start + piece.length()
spans.append((start, end))
if self.encoded == 2:
spans = self._convert_spans(spans, cstring, size, cpos, upos)
self.regs = tuple(spans)
cdef list _convert_spans(self, spans,
char * cstring, int size, int * cpos, int * upos):
cdef map[int, int] positions
cdef int x, y
for x, y in spans:
positions[x] = x
positions[y] = y
unicodeindices(positions, cstring, size, cpos, upos)
return [(positions[x], positions[y]) for x, y in spans]
def __dealloc__(self):
delete_StringPiece_array(self.matches)
def __repr__(self):
return '<re2.Match object; span=%r, match=%r>' % (
self.span(), self.group())
|
