Patch #914575: difflib side by side diff support, diff.py s/b/s HTML option.

Lib/test/test_difflib.py

@@ -1,5 +1,5 @@
 import difflib
-from test import test_support
+from test.test_support import run_unittest, findfile
 import unittest
 import doctest
 
@@ -19,6 +19,130 @@ class TestSFbugs(unittest.TestCase):
         diff_gen = difflib.unified_diff([], [])
         self.assertRaises(StopIteration, diff_gen.next)
 
+patch914575_from1 = """
+   1. Beautiful is beTTer than ugly.
+   2. Explicit is better than implicit.
+   3. Simple is better than complex.
+   4. Complex is better than complicated.
+"""
+
+patch914575_to1 = """
+   1. Beautiful is better than ugly.
+   3.   Simple is better than complex.
+   4. Complicated is better than complex.
+   5. Flat is better than nested.
+"""
+
+patch914575_from2 = """
+\t\tLine 1: preceeded by from:[tt] to:[ssss]
+  \t\tLine 2: preceeded by from:[sstt] to:[sssst]
+  \t \tLine 3: preceeded by from:[sstst] to:[ssssss]
+Line 4:  \thas from:[sst] to:[sss] after :
+Line 5: has from:[t] to:[ss] at end\t
+"""
+
+patch914575_to2 = """
+    Line 1: preceeded by from:[tt] to:[ssss]
+    \tLine 2: preceeded by from:[sstt] to:[sssst]
+      Line 3: preceeded by from:[sstst] to:[ssssss]
+Line 4:   has from:[sst] to:[sss] after :
+Line 5: has from:[t] to:[ss] at end  
+"""
+
+patch914575_from3 = """line 0
+1234567890123456789012345689012345
+line 1
+line 2
+line 3
+line 4   changed 
+line 5   changed 
+line 6   changed 
+line 7
+line 8  subtracted
+line 9
+1234567890123456789012345689012345
+short line
+just fits in!!
+just fits in two lines yup!!
+the end"""
+
+patch914575_to3 = """line 0
+1234567890123456789012345689012345
+line 1
+line 2    added
+line 3
+line 4   chanGEd 
+line 5a  chanGed 
+line 6a  changEd 
+line 7
+line 8
+line 9
+1234567890
+another long line that needs to be wrapped
+just fitS in!!
+just fits in two lineS yup!!
+the end"""
+
+class TestSFpatches(unittest.TestCase):
+
+    def test_html_diff(self):
+        # Check SF patch 914575 for generating HTML differences
+        f1a = ((patch914575_from1 + '123\n'*10)*3)
+        t1a = (patch914575_to1 + '123\n'*10)*3
+        f1b = '456\n'*10 + f1a
+        t1b = '456\n'*10 + t1a
+        f1a = f1a.splitlines()
+        t1a = t1a.splitlines()
+        f1b = f1b.splitlines()
+        t1b = t1b.splitlines()
+        f2 = patch914575_from2.splitlines()
+        t2 = patch914575_to2.splitlines()
+        f3 = patch914575_from3
+        t3 = patch914575_to3
+        i = difflib.HtmlDiff()
+        j = difflib.HtmlDiff(tabsize=2)
+        k = difflib.HtmlDiff(wrapcolumn=14)
+        
+        full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
+        tables = '\n'.join(
+            [
+             '<h2>Context (first diff within numlines=5(default))</h2>', 
+             i.make_table(f1a,t1a,'from','to',context=True),
+             '<h2>Context (first diff after numlines=5(default))</h2>', 
+             i.make_table(f1b,t1b,'from','to',context=True),
+             '<h2>Context (numlines=6)</h2>', 
+             i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
+             '<h2>Context (numlines=0)</h2>', 
+             i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
+             '<h2>Same Context</h2>', 
+             i.make_table(f1a,f1a,'from','to',context=True),
+             '<h2>Same Full</h2>', 
+             i.make_table(f1a,f1a,'from','to',context=False),
+             '<h2>Empty Context</h2>',
+             i.make_table([],[],'from','to',context=True),
+             '<h2>Empty Full</h2>',
+             i.make_table([],[],'from','to',context=False),
+             '<h2>tabsize=2</h2>',
+             j.make_table(f2,t2),
+             '<h2>tabsize=default</h2>',
+             i.make_table(f2,t2),
+             '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
+             k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
+             '<h2>wrapcolumn=14,splitlines()</h2>',
+             k.make_table(f3.splitlines(),t3.splitlines()),
+             '<h2>wrapcolumn=14,splitlines(True)</h2>',
+             k.make_table(f3.splitlines(True),t3.splitlines(True)),
+             ])
+        actual = full.replace('</body>','\n%s\n</body>' % tables)
+        # temporarily uncomment next three lines to baseline this test
+        #f = open('test_difflib_expect.html','w')
+        #f.write(actual)
+        #f.close()
+        expect = open(findfile('test_difflib_expect.html')).read()
+        
+                          
+        self.assertEqual(actual,expect)
+
 Doctests = doctest.DocTestSuite(difflib)
 
-test_support.run_unittest(TestSFbugs, Doctests)
+run_unittest(TestSFpatches, TestSFbugs, Doctests)