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1# Copyright 2016 Google Inc. All Rights Reserved.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7# http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14"""Support module for tests for yapf."""
15
16import difflib
17import sys
18import unittest
19
20from yapf.pytree import blank_line_calculator
21from yapf.pytree import comment_splicer
22from yapf.pytree import continuation_splicer
23from yapf.pytree import pytree_unwrapper
24from yapf.pytree import pytree_utils
25from yapf.pytree import pytree_visitor
26from yapf.pytree import split_penalty
27from yapf.pytree import subtype_assigner
28from yapf.yapflib import identify_container
29from yapf.yapflib import style
30
31
32class YAPFTest(unittest.TestCase):
33
34 def __init__(self, *args):
35 super(YAPFTest, self).__init__(*args)
36
37 def assertCodeEqual(self, expected_code, code):
38 if code != expected_code:
39 msg = ['Code format mismatch:', 'Expected:']
40 linelen = style.Get('COLUMN_LIMIT')
41 for line in expected_code.splitlines():
42 if len(line) > linelen:
43 msg.append('!> %s' % line)
44 else:
45 msg.append(' > %s' % line)
46 msg.append('Actual:')
47 for line in code.splitlines():
48 if len(line) > linelen:
49 msg.append('!> %s' % line)
50 else:
51 msg.append(' > %s' % line)
52 msg.append('Diff:')
53 msg.extend(
54 difflib.unified_diff(
55 code.splitlines(),
56 expected_code.splitlines(),
57 fromfile='actual',
58 tofile='expected',
59 lineterm=''))
60 self.fail('\n'.join(msg))
61
62
63def ParseAndUnwrap(code, dumptree=False):
64 """Produces logical lines from the given code.
65
66 Parses the code into a tree, performs comment splicing and runs the
67 unwrapper.
68
69 Arguments:
70 code: code to parse as a string
71 dumptree: if True, the parsed pytree (after comment splicing) is dumped
72 to stderr. Useful for debugging.
73
74 Returns:
75 List of logical lines.
76 """
77 tree = pytree_utils.ParseCodeToTree(code)
78 comment_splicer.SpliceComments(tree)
79 continuation_splicer.SpliceContinuations(tree)
80 subtype_assigner.AssignSubtypes(tree)
81 identify_container.IdentifyContainers(tree)
82 split_penalty.ComputeSplitPenalties(tree)
83 blank_line_calculator.CalculateBlankLines(tree)
84
85 if dumptree:
86 pytree_visitor.DumpPyTree(tree, target_stream=sys.stderr)
87
88 llines = pytree_unwrapper.UnwrapPyTree(tree)
89 for lline in llines:
90 lline.CalculateFormattingInformation()
91
92 return llines