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
|
# Copyright (C) 2010-2011 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Unicode-compatible command-line splitter for all platforms.
The user-visible behaviour of this module is described in
configuring_bazaar.txt.
"""
from __future__ import absolute_import
import re
_whitespace_match = re.compile(u'\s', re.UNICODE).match
class _PushbackSequence(object):
def __init__(self, orig):
self._iter = iter(orig)
self._pushback_buffer = []
def next(self):
if len(self._pushback_buffer) > 0:
return self._pushback_buffer.pop()
else:
return self._iter.next()
def pushback(self, char):
self._pushback_buffer.append(char)
def __iter__(self):
return self
class _Whitespace(object):
def process(self, next_char, context):
if _whitespace_match(next_char):
if len(context.token) > 0:
return None
else:
return self
elif next_char in context.allowed_quote_chars:
context.quoted = True
return _Quotes(next_char, self)
elif next_char == u'\\':
return _Backslash(self)
else:
context.token.append(next_char)
return _Word()
class _Quotes(object):
def __init__(self, quote_char, exit_state):
self.quote_char = quote_char
self.exit_state = exit_state
def process(self, next_char, context):
if next_char == u'\\':
return _Backslash(self)
elif next_char == self.quote_char:
return self.exit_state
else:
context.token.append(next_char)
return self
class _Backslash(object):
# See http://msdn.microsoft.com/en-us/library/bb776391(VS.85).aspx
def __init__(self, exit_state):
self.exit_state = exit_state
self.count = 1
def process(self, next_char, context):
if next_char == u'\\':
self.count += 1
return self
elif next_char in context.allowed_quote_chars:
# 2N backslashes followed by a quote are N backslashes
context.token.append(u'\\' * (self.count/2))
# 2N+1 backslashes follwed by a quote are N backslashes followed by
# the quote which should not be processed as the start or end of
# the quoted arg
if self.count % 2 == 1:
# odd number of \ escapes the quote
context.token.append(next_char)
else:
# let exit_state handle next_char
context.seq.pushback(next_char)
self.count = 0
return self.exit_state
else:
# N backslashes not followed by a quote are just N backslashes
if self.count > 0:
context.token.append(u'\\' * self.count)
self.count = 0
# let exit_state handle next_char
context.seq.pushback(next_char)
return self.exit_state
def finish(self, context):
if self.count > 0:
context.token.append(u'\\' * self.count)
class _Word(object):
def process(self, next_char, context):
if _whitespace_match(next_char):
return None
elif next_char in context.allowed_quote_chars:
return _Quotes(next_char, self)
elif next_char == u'\\':
return _Backslash(self)
else:
context.token.append(next_char)
return self
class Splitter(object):
def __init__(self, command_line, single_quotes_allowed):
self.seq = _PushbackSequence(command_line)
self.allowed_quote_chars = u'"'
if single_quotes_allowed:
self.allowed_quote_chars += u"'"
def __iter__(self):
return self
def next(self):
quoted, token = self._get_token()
if token is None:
raise StopIteration
return quoted, token
def _get_token(self):
self.quoted = False
self.token = []
state = _Whitespace()
for next_char in self.seq:
state = state.process(next_char, self)
if state is None:
break
if not state is None and not getattr(state, 'finish', None) is None:
state.finish(self)
result = u''.join(self.token)
if not self.quoted and result == '':
result = None
return self.quoted, result
def split(unsplit, single_quotes_allowed=True):
splitter = Splitter(unsplit, single_quotes_allowed=single_quotes_allowed)
return [arg for quoted, arg in splitter]
|
