webkitpy: Simplify DiffParser, removing support for SVN patches.

third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/diff_parser_unittest.py

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-import cStringIO as StringIO
 import re
 import unittest
 
-from webkitpy.common.checkout import diff_parser
+from webkitpy.common.checkout.diff_parser import DiffParser
 from webkitpy.common.checkout.diff_test_data import DIFF_TEST_DATA
 
 
 class DiffParserTest(unittest.TestCase):
-    maxDiff = None
 
     def test_diff_parser(self, parser=None):
         if not parser:
-            parser = diff_parser.DiffParser(DIFF_TEST_DATA.splitlines())
+            parser = DiffParser(DIFF_TEST_DATA.splitlines())
         self.assertEqual(3, len(parser.files))
 
         self.assertIn('WebCore/style/StyleFlexibleBoxData.h', parser.files)
         diff = parser.files['WebCore/style/StyleFlexibleBoxData.h']
         self.assertEqual(7, len(diff.lines))
+
         # The first two unchanged lines.
         self.assertEqual((47, 47), diff.lines[0][0:2])
         self.assertEqual('', diff.lines[0][2])
         self.assertEqual((48, 48), diff.lines[1][0:2])
         self.assertEqual('    unsigned align : 3; // EBoxAlignment', diff.lines[1][2])
-        # The deleted line
+
+        # The deleted line.
         self.assertEqual((50, 0), diff.lines[3][0:2])
         self.assertEqual('    unsigned orient: 1; // EBoxOrient', diff.lines[3][2])
 
         # The first file looks OK. Let's check the next, more complicated file.
         self.assertIn('WebCore/style/StyleRareInheritedData.cpp', parser.files)
         diff = parser.files['WebCore/style/StyleRareInheritedData.cpp']
+
         # There are 3 chunks.
         self.assertEqual(7 + 7 + 9, len(diff.lines))
+
         # Around an added line.
         self.assertEqual((60, 61), diff.lines[9][0:2])
         self.assertEqual((0, 62), diff.lines[10][0:2])
         self.assertEqual((61, 63), diff.lines[11][0:2])
-        # Look through the last chunk, which contains both add's and delete's.
+
+        # Look through the last chunk, which contains both adds and deletes.
         self.assertEqual((81, 83), diff.lines[14][0:2])
         self.assertEqual((82, 84), diff.lines[15][0:2])
         self.assertEqual((83, 85), diff.lines[16][0:2])
         self.assertEqual((84, 0), diff.lines[17][0:2])
         self.assertEqual((0, 86), diff.lines[18][0:2])
         self.assertEqual((0, 87), diff.lines[19][0:2])
         self.assertEqual((85, 88), diff.lines[20][0:2])
         self.assertEqual((86, 89), diff.lines[21][0:2])
         self.assertEqual((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.assertEqual(1, len(diff.lines))
         self.assertEqual((0, 1), diff.lines[0][0:2])
 
-    def test_diff_converter(self):
-        comment_lines = [
-            "Hey people,\n",
-            "\n",
-            "See my awesome patch below!\n",
-            "\n",
-            " - Cool Hacker\n",
-            "\n",
-        ]
+    def test_diff_parser_with_different_mnemonic_prefixes(self):
+        # This repeats test_diff_parser but with different versions
+        # of DIFF_TEST_DATA that use other prefixes instead of a/b.
+        prefixes = (
+            ('i', 'w'),  # git-diff (compares the (i)ndex and the (w)ork tree)
+            ('c', 'w'),  # git-diff HEAD (compares a (c)ommit and the (w)ork tree)
+            ('c', 'i'),  # git diff --cached (compares a (c)ommit and the (i)ndex)
+            ('o', 'w'),  # git-diff HEAD:file1 file2 (compares an (o)bject and a (w)ork tree entity)
+            ('1', '2'),  # git diff --no-index a b (compares two non-git things (1) and (2))
+        )
+        for a_replacement, b_replacement in prefixes:
+            patch = self._patch(a_replacement, b_replacement)
+            self.test_diff_parser(DiffParser(patch.splitlines()))
 
-        revision_lines = [
-            "Subversion Revision 289799\n",
-        ]
-
-        svn_diff_lines = [
-            "Index: Tools/Scripts/webkitpy/common/checkout/diff_parser.py\n",
-            "===================================================================\n",
-            "--- Tools/Scripts/webkitpy/common/checkout/diff_parser.py\n",
-            "+++ Tools/Scripts/webkitpy/common/checkout/diff_parser.py\n",
-            "@@ -59,6 +59,7 @@ def git_diff_to_svn_diff(line):\n",
-        ]
-        self.assertEqual(diff_parser.get_diff_converter(svn_diff_lines), diff_parser.svn_diff_to_svn_diff)
-        self.assertEqual(diff_parser.get_diff_converter(comment_lines + svn_diff_lines), diff_parser.svn_diff_to_svn_diff)
-        self.assertEqual(diff_parser.get_diff_converter(revision_lines + svn_diff_lines), diff_parser.svn_diff_to_svn_diff)
-
-        git_diff_lines = [
-            ("diff --git a/Tools/Scripts/webkitpy/common/checkout/diff_parser.py "
-             "b/Tools/Scripts/webkitpy/common/checkout/diff_parser.py\n"),
-            "index 3c5b45b..0197ead 100644\n",
-            "--- a/Tools/Scripts/webkitpy/common/checkout/diff_parser.py\n",
-            "+++ b/Tools/Scripts/webkitpy/common/checkout/diff_parser.py\n",
-            "@@ -59,6 +59,7 @@ def git_diff_to_svn_diff(line):\n",
-        ]
-        self.assertEqual(diff_parser.get_diff_converter(git_diff_lines), diff_parser.git_diff_to_svn_diff)
-        self.assertEqual(diff_parser.get_diff_converter(comment_lines + git_diff_lines), diff_parser.git_diff_to_svn_diff)
-        self.assertEqual(diff_parser.get_diff_converter(revision_lines + git_diff_lines), diff_parser.git_diff_to_svn_diff)
-
-    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()))
-
-    def test_git_diff_to_svn_diff(self):
-        output = """\
-Index: Tools/Scripts/webkitpy/common/checkout/diff_parser.py
-===================================================================
---- Tools/Scripts/webkitpy/common/checkout/diff_parser.py
-+++ Tools/Scripts/webkitpy/common/checkout/diff_parser.py
-@@ -59,6 +59,7 @@ def git_diff_to_svn_diff(line):
- A
- B
- C
-+D
- E
- F
-"""
-
-        inputfmt = StringIO.StringIO("""\
-diff --git a/Tools/Scripts/webkitpy/common/checkout/diff_parser.py b/Tools/Scripts/webkitpy/common/checkout/diff_parser.py
-index 2ed552c4555db72df16b212547f2c125ae301a04..72870482000c0dba64ce4300ed782c03ee79b74f 100644
---- a/Tools/Scripts/webkitpy/common/checkout/diff_parser.py
-+++ b/Tools/Scripts/webkitpy/common/checkout/diff_parser.py
-@@ -59,6 +59,7 @@ def git_diff_to_svn_diff(line):
- A
- B
- C
-+D
- E
- F
-""")
-        shortfmt = StringIO.StringIO("""\
-diff --git a/Tools/Scripts/webkitpy/common/checkout/diff_parser.py b/Tools/Scripts/webkitpy/common/checkout/diff_parser.py
-index b48b162..f300960 100644
---- a/Tools/Scripts/webkitpy/common/checkout/diff_parser.py
-+++ b/Tools/Scripts/webkitpy/common/checkout/diff_parser.py
-@@ -59,6 +59,7 @@ def git_diff_to_svn_diff(line):
- A
- B
- C
-+D
- E
- F
-""")
-
-        self.assertMultiLineEqual(output, ''.join(diff_parser.git_diff_to_svn_diff(x) for x in shortfmt.readlines()))
-        self.assertMultiLineEqual(output, ''.join(diff_parser.git_diff_to_svn_diff(x) for x in inputfmt.readlines()))
+    @staticmethod
+    def _patch(a_replacement='a', b_replacement='b'):
+        """Returns a version of the example patch with mnemonic prefixes a/b changed."""
+        patch = re.sub(r' a/', ' %s/' % a_replacement, DIFF_TEST_DATA)
+        return re.sub(r' b/', ' %s/' % b_replacement, patch)