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executable file 325 lines (259 sloc) 8.804 kb
#!/usr/bin/env python
##########################################################################
#
# Copyright 2011 Jose Fonseca
# All Rights Reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
##########################################################################/
import json
import optparse
import re
import sys
def strip_object_hook(obj):
if '__class__' in obj:
return None
for name in obj.keys():
if name.startswith('__') and name.endswith('__'):
del obj[name]
return obj
class Visitor:
def visit(self, node, *args, **kwargs):
if isinstance(node, dict):
return self.visitObject(node, *args, **kwargs)
elif isinstance(node, list):
return self.visitArray(node, *args, **kwargs)
else:
return self.visitValue(node, *args, **kwargs)
def visitObject(self, node, *args, **kwargs):
pass
def visitArray(self, node, *args, **kwargs):
pass
def visitValue(self, node, *args, **kwargs):
pass
class Dumper(Visitor):
def __init__(self, stream = sys.stdout):
self.stream = stream
self.level = 0
def _write(self, s):
self.stream.write(s)
def _indent(self):
self._write(' '*self.level)
def _newline(self):
self._write('\n')
def visitObject(self, node):
self.enter_object()
members = node.keys()
members.sort()
for i in range(len(members)):
name = members[i]
value = node[name]
self.enter_member(name)
self.visit(value)
self.leave_member(i == len(members) - 1)
self.leave_object()
def enter_object(self):
self._write('{')
self._newline()
self.level += 1
def enter_member(self, name):
self._indent()
self._write('%s: ' % name)
def leave_member(self, last):
if not last:
self._write(',')
self._newline()
def leave_object(self):
self.level -= 1
self._indent()
self._write('}')
if self.level <= 0:
self._newline()
def visitArray(self, node):
self.enter_array()
for i in range(len(node)):
value = node[i]
self._indent()
self.visit(value)
if i != len(node) - 1:
self._write(',')
self._newline()
self.leave_array()
def enter_array(self):
self._write('[')
self._newline()
self.level += 1
def leave_array(self):
self.level -= 1
self._indent()
self._write(']')
def visitValue(self, node):
self._write(json.dumps(node))
class Comparer(Visitor):
def __init__(self, ignore_added = False, tolerance = 2.0 ** -24):
self.ignore_added = ignore_added
self.tolerance = tolerance
def visitObject(self, a, b):
if not isinstance(b, dict):
return False
if len(a) != len(b) and not self.ignore_added:
return False
ak = a.keys()
bk = b.keys()
ak.sort()
bk.sort()
if ak != bk and not self.ignore_added:
return False
for k in ak:
ae = a[k]
try:
be = b[k]
except KeyError:
return False
if not self.visit(ae, be):
return False
return True
def visitArray(self, a, b):
if not isinstance(b, list):
return False
if len(a) != len(b):
return False
for ae, be in zip(a, b):
if not self.visit(ae, be):
return False
return True
def visitValue(self, a, b):
if isinstance(a, float) or isinstance(b, float):
if a == 0:
return abs(b) < self.tolerance
else:
return abs((b - a)/a) < self.tolerance
else:
return a == b
class Differ(Visitor):
def __init__(self, stream = sys.stdout, ignore_added = False):
self.dumper = Dumper(stream)
self.comparer = Comparer(ignore_added = ignore_added)
def visit(self, a, b):
if self.comparer.visit(a, b):
return
Visitor.visit(self, a, b)
def visitObject(self, a, b):
if not isinstance(b, dict):
self.replace(a, b)
else:
self.dumper.enter_object()
names = set(a.keys())
if not self.comparer.ignore_added:
names.update(b.keys())
names = list(names)
names.sort()
for i in range(len(names)):
name = names[i]
ae = a.get(name, None)
be = b.get(name, None)
if not self.comparer.visit(ae, be):
self.dumper.enter_member(name)
self.visit(ae, be)
self.dumper.leave_member(i == len(names) - 1)
self.dumper.leave_object()
def visitArray(self, a, b):
if not isinstance(b, list):
self.replace(a, b)
else:
self.dumper.enter_array()
max_len = max(len(a), len(b))
for i in range(max_len):
try:
ae = a[i]
except IndexError:
ae = None
try:
be = b[i]
except IndexError:
be = None
self.dumper._indent()
if self.comparer.visit(ae, be):
self.dumper.visit(ae)
else:
self.visit(ae, be)
if i != max_len - 1:
self.dumper._write(',')
self.dumper._newline()
self.dumper.leave_array()
def visitValue(self, a, b):
if a != b:
self.replace(a, b)
def replace(self, a, b):
self.dumper.visit(a)
self.dumper._write(' -> ')
self.dumper.visit(b)
#
# Unfortunately JSON standard does not include comments, but this is a quite
# useful feature to have on regressions tests
#
_token_res = [
r'//[^\r\n]*', # comment
r'"[^"\\]*(\\.[^"\\]*)*"', # string
]
_tokens_re = re.compile(r'|'.join(['(' + token_re + ')' for token_re in _token_res]), re.DOTALL)
def _strip_comment(mo):
if mo.group(1):
return ''
else:
return mo.group(0)
def _strip_comments(data):
'''Strip (non-standard) JSON comments.'''
return _tokens_re.sub(_strip_comment, data)
assert _strip_comments('''// a comment
"// a comment in a string
"''') == '''
"// a comment in a string
"'''
def load(stream, strip_images = True, strip_comments = True):
if strip_images:
object_hook = strip_object_hook
else:
object_hook = None
if strip_comments:
data = stream.read()
data = _strip_comments(data)
return json.loads(data, strict=False, object_hook = object_hook)
else:
return json.load(stream, strict=False, object_hook = object_hook)
def main():
optparser = optparse.OptionParser(
usage="\n\t%prog [options] <ref_json> <src_json>")
optparser.add_option(
'--keep-images',
action="store_false", dest="strip_images", default=True,
help="compare images")
(options, args) = optparser.parse_args(sys.argv[1:])
if len(args) != 2:
optparser.error('incorrect number of arguments')
a = load(open(sys.argv[1], 'rt'), options.strip_images)
b = load(open(sys.argv[2], 'rt'), options.strip_images)
if False:
dumper = Dumper()
dumper.visit(a)
differ = Differ()
differ.visit(a, b)
if __name__ == '__main__':
main()
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