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import unittest
import diff_parser
import re

from webkitpy.common.checkout.diff_test_data import DIFF_TEST_DATA

class DiffParserTest(unittest.TestCase):
    def test_diff_parser(self, parser = None):
        if not parser:
            parser = diff_parser.DiffParser(DIFF_TEST_DATA.splitlines())
        self.assertEquals(3, len(parser.files))

        self.assertTrue('WebCore/rendering/style/StyleFlexibleBoxData.h' in parser.files)
        diff = parser.files['WebCore/rendering/style/StyleFlexibleBoxData.h']
        self.assertEquals(7, len(diff.lines))
        # The first two unchaged lines.
        self.assertEquals((47, 47), diff.lines[0][0:2])
        self.assertEquals('', diff.lines[0][2])
        self.assertEquals((48, 48), diff.lines[1][0:2])
        self.assertEquals('    unsigned align : 3; // EBoxAlignment', diff.lines[1][2])
        # The deleted line
        self.assertEquals((50, 0), diff.lines[3][0:2])
        self.assertEquals('    unsigned orient: 1; // EBoxOrient', diff.lines[3][2])

        # The first file looks OK. Let's check the next, more complicated file.
        self.assertTrue('WebCore/rendering/style/StyleRareInheritedData.cpp' in parser.files)
        diff = parser.files['WebCore/rendering/style/StyleRareInheritedData.cpp']
        # There are 3 chunks.
        self.assertEquals(7 + 7 + 9, len(diff.lines))
        # Around an added line.
        self.assertEquals((60, 61), diff.lines[9][0:2])
        self.assertEquals((0, 62), diff.lines[10][0:2])
        self.assertEquals((61, 63), diff.lines[11][0:2])
        # Look through the last chunk, which contains both add's and delete's.
        self.assertEquals((81, 83), diff.lines[14][0:2])
        self.assertEquals((82, 84), diff.lines[15][0:2])
        self.assertEquals((83, 85), diff.lines[16][0:2])
        self.assertEquals((84, 0), diff.lines[17][0:2])
        self.assertEquals((0, 86), diff.lines[18][0:2])
        self.assertEquals((0, 87), diff.lines[19][0:2])
        self.assertEquals((85, 88), diff.lines[20][0:2])
        self.assertEquals((86, 89), diff.lines[21][0:2])
        self.assertEquals((87, 90), diff.lines[22][0:2])

        # Check if a newly added file is correctly handled.
        diff = parser.files['LayoutTests/platform/mac/fast/flexbox/box-orient-button-expected.checksum']
        self.assertEquals(1, len(diff.lines))
        self.assertEquals((0, 1), diff.lines[0][0:2])

    def test_git_mnemonicprefix(self):
        p = re.compile(r' ([a|b])/')

        prefixes = [
            { 'a' : 'i', 'b' : 'w' }, # git-diff (compares the (i)ndex and the (w)ork tree)
            { 'a' : 'c', 'b' : 'w' }, # git-diff HEAD (compares a (c)ommit and the (w)ork tree)
            { 'a' : 'c', 'b' : 'i' }, # git diff --cached (compares a (c)ommit and the (i)ndex)
            { 'a' : 'o', 'b' : 'w' }, # git-diff HEAD:file1 file2 (compares an (o)bject and a (w)ork tree entity)
            { 'a' : '1', 'b' : '2' }, # git diff --no-index a b (compares two non-git things (1) and (2))
        ]

        for prefix in prefixes:
            patch = p.sub(lambda x: " %s/" % prefix[x.group(1)], DIFF_TEST_DATA)
            self.test_diff_parser(diff_parser.DiffParser(patch.splitlines()))

if __name__ == '__main__':
    unittest.main()