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
|
#!/usr/bin/env python
import lxml.etree as et
import sys, os.path, optparse, itertools
SHORT_DESCRIPTION = "An XPath file finder for XML files."
__doc__ = SHORT_DESCRIPTION + '''
Evaluates an XPath expression against a series of files and prints the
matching subtrees to stdout.
Examples::
$ cat test.xml
<root>
<a num="1234" notnum="1234abc"/>
<b text="abc"/>
<c text="aBc"/>
</root>
# find all leaf elements:
$ SCRIPT '//*[not(*)]' test.xml
<a num="1234" notnum="1234abc"/>
<b text="abc"/>
<c text="aBc"/>
# find all elements with attribute values containing "abc" ignoring case:
$ SCRIPT '//*[@*[contains(py:lower(.), "abc")]]' test.xml
<a num="1234" notnum="1234abc"/>
<b text="abc"/>
<c text="aBc"/>
# find all numeric attribute values:
$ SCRIPT '//@*[re:match(., "^[0-9]+$")]' test.xml
1234
* find all elements with numeric attribute values:
$ SCRIPT '//*[@*[re:match(., "^[0-9]+$")]]' test.xml
<a num="1234" notnum="1234abc"/>
* find all elements with numeric attribute values in more than one file:
$ SCRIPT '//*[@*[re:match(., "^[0-9]+$")]]' test.xml test.xml test.xml
>> test.xml
<a num="1234" notnum="1234abc"/>
>> test.xml
<a num="1234" notnum="1234abc"/>
>> test.xml
<a num="1234" notnum="1234abc"/>
* find XML files that have non-empty root nodes:
$ SCRIPT -q '*' test.xml test.xml test.xml
>> test.xml
>> test.xml
>> test.xml
* find out if an XML file has at most depth three:
$ SCRIPT 'not(/*/*/*)' test.xml
True
'''.replace('SCRIPT', os.path.basename(sys.argv[0]))
REGEXP_NS = "http://exslt.org/regular-expressions"
PYTHON_BUILTINS_NS = "PYTHON-BUILTINS"
parser = et.XMLParser(remove_blank_text=True)
def print_results(results):
if isinstance(results, basestring) or isinstance(results, bool):
print results
return
for result in results:
if isinstance(result, basestring) or isinstance(result, bool):
print result
else:
print et.tostring(
result,
xml_declaration=False,
pretty_print=True)
def find_in_file(f, xpath, print_name=True, xinclude=False):
if hasattr(f, 'name'):
filename = f.name
else:
filename = f
try:
try:
tree = et.parse(f, parser)
except IOError, e:
print >> sys.stderr, "ERR: parsing %r failed: %s: %s" % (
filename, e.__class__.__name__, e)
return False
try:
if xinclude:
tree.xinclude()
except IOError, e:
print >> sys.stderr, "ERR: XInclude for %r failed: %s: %s" % (
filename, e.__class__.__name__, e)
return False
if not callable(xpath):
xpath = et.XPath(xpath)
results = xpath(tree)
if results == []:
return False
if print_name:
print ">> %s" % f
if options.verbose:
print_results(results)
return True
except Exception, e:
print >> sys.stderr, "ERR: %r: %s: %s" % (
filename, e.__class__.__name__, e)
return False
def register_builtins():
ns = et.FunctionNamespace(PYTHON_BUILTINS_NS)
for (name, builtin) in vars(__builtins__).iteritems():
if callable(builtin):
if not name.startswith('_') and name == name.lower():
ns[name] = builtin
str_xpath = et.XPath("string()")
def lower(_, s):
if isinstance(s, list):
if not s:
return ''
s = s[0]
if not isinstance(s, basestring):
if isinstance(s, bool):
s = str(s)
else:
s = str_xpath(s)
return s.lower()
def upper(_, s):
if isinstance(s, list):
if not s:
return ''
s = s[0]
if not isinstance(s, basestring):
if isinstance(s, bool):
s = str(s)
else:
s = str_xpath(s)
return s.upper()
ns["lower"] = lower
ns["upper"] = upper
def parse_options():
from optparse import OptionParser
usage = "usage: %prog [options] XPATH [FILE ...]"
parser = OptionParser(
usage = usage,
version = "%prog using lxml.etree " + et.__version__,
description = SHORT_DESCRIPTION)
parser.add_option("-H", "--long-help",
action="store_true", dest="long_help", default=False,
help="a longer help text including usage examples")
parser.add_option("-i", "--xinclude",
action="store_true", dest="xinclude", default=False,
help="run XInclude on the file before XPath")
parser.add_option("--no-python",
action="store_false", dest="python", default=True,
help="disable Python builtins (prefix 'py')")
parser.add_option("--no-regexp",
action="store_false", dest="regexp", default=True,
help="disable regular expressions (prefix 're')")
parser.add_option("-q", "--quiet",
action="store_false", dest="verbose", default=True,
help="don't print status messages to stdout")
options, args = parser.parse_args()
if options.long_help:
parser.print_help()
print __doc__[__doc__.find('\n\n')+1:]
sys.exit(0)
if len(args) < 1:
parser.error("first argument must be an XPath expression")
return options, args
if __name__ == "__main__":
options, args = parse_options()
namespaces = {}
if options.regexp:
namespaces["re"] = REGEXP_NS
if options.python:
register_builtins()
namespaces["py"] = PYTHON_BUILTINS_NS
xpath = et.XPath(args[0], namespaces)
found = False
if len(args) == 1:
found = find_in_file(
sys.stdin, xpath, print_name, options.xinclude)
else:
print_name = len(args) > 2
for filename in itertools.islice(args, 1, None):
found |= find_in_file(
filename, xpath, print_name, options.xinclude)
if found:
sys.exit(0)
else:
sys.exit(1)
|
