Completed Html_differ unit tests.
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@ -17,6 +17,7 @@ class Html_differ( HTMLParser ):
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WORD_AND_WHITESPACE_PATTERN = re.compile( "\S*\s*" )
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def handle_data( self, data ):
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# this turns "foo bar baz" into [ "foo ", "bar ", "baz" ] and extends the result with it
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self.result.extend( self.WORD_AND_WHITESPACE_PATTERN.findall( data ) )
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def handle_charref( self, ref ):
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@ -33,8 +34,7 @@ class Html_differ( HTMLParser ):
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def handle_endtag( self, tag, attrs ):
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if tag not in self.requires_no_close:
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bracketed = "</%s>" % tag
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self.result.append( bracketed )
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self.result.append( "</%s>" % tag )
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def unknown_starttag( self, tag, attr ):
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self.handle_starttag( tag, None, attr )
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@ -45,35 +45,56 @@ class Html_differ( HTMLParser ):
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# used to replace, for instance, "<br/>" with "<br />"
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INVALID_TAG_PATTERN = re.compile( "(\S)/>" )
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INVALID_TAG_FIX = "\\1 />"
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START_TAG_PATTERN = re.compile( "<([^/][^>]*)>" )
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END_TAG_PATTERN = re.compile( "</([^>]+)>" )
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def convert_html_to_list( self, html ):
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"""
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Given an HTML string, produce a list of its constituent elements (tags and text).
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@type html: unicode
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@param html: HTML string to parse
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@rtype: [ unicode, ... ]
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@return: parsed list of HTML elements
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"""
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self.reset()
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self.result = []
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html = self.INVALID_TAG_PATTERN.sub( self.INVALID_TAG_FIX, html )
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self.feed( html )
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return [ x for x in self.result if x != "" ]
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def diff( self, html_a, html_b ):
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"""
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Return a composite HTML diff of the given HTML input strings.
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Return a composite HTML diff of the given HTML input strings. The returned string contains the
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entirety of the input strings, but with deleted/modified text from html_a wrapped in <del> tags,
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and inserted/modified text from html_b wrapped in <ins> tags.
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@type html_a: unicode
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@param html_a: original HTML string
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@type html_b: unicode
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@param html-b: modified HTML string
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@rtype: unicode
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@return: composite HTML diff
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"""
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# parse html_a into a list
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self.reset()
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self.result = []
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html_a = self.INVALID_TAG_PATTERN.sub( self.INVALID_TAG_FIX, html_a )
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self.feed( html_a )
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a = [ x for x in self.result if x != "" ]
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# parse the two html strings into lists
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a = self.convert_html_to_list( html_a )
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b = self.convert_html_to_list( html_b )
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# parse html_b into a list
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self.reset()
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self.result = []
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html_b = self.INVALID_TAG_PATTERN.sub( self.INVALID_TAG_FIX, html_b )
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self.feed( html_b )
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b = [ x for x in self.result if x != "" ]
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# prepare the two lists for diffing, and then diff 'em
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( a, b ) = self.prepare_lists( a, b )
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return self.diff_lists( a, b )
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( a, b ) = self.__prepare_lists( a, b )
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return self.__diff_lists( a, b )
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START_TAG_PATTERN = re.compile( "<([^/][^>]*)>" )
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END_TAG_PATTERN = re.compile( "</([^>]+)>" )
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@staticmethod
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def __track_open_tags( item, open_tags ):
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def track_open_tags( item, open_tags ):
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"""
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Add or remove from the open_tags list based on whether the given item is a start or end
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tag.
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Add or remove from the open_tags list based on whether the given item contains a start or end
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tag. If item does not contain any tag, then open_tags remains unchanged.
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@type item: unicode
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@param item: chunk of HTML, containing either an HTML tag or just text
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@type open_tags: [ unicode, ... ]
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@param open_tags: list of open tags
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"""
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match = Html_differ.START_TAG_PATTERN.search( item )
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if match:
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@ -87,10 +108,26 @@ class Html_differ( HTMLParser ):
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if match and tag in open_tags:
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open_tags.remove( tag )
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def __prepare_lists( self, a, b ):
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def prepare_lists( self, a, b ):
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"""
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Prepare the two lists for diffing by merging together adjacent elements within
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modified/inserted/deleted start and end HTML tags.
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Prepare the two lists for diffing by merging together adjacent elements that occur within
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modified start and end HTML tags.
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For instance, if:
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a = [ 'foo ', 'bar ', 'baz ', 'quux' ]
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b = [ 'foo ', '<i>', 'bar ', 'baz', '</i> ', 'quux' ]
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then the returned lists are as follows:
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a = [ 'foo ', 'bar baz ', 'quux' ]
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b = [ 'foo ', '<i>bar baz</i> ', 'quux' ]
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Merging these elements together ensures that they're diffed as a single unit. Failing to perform
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this step would mean that when a phrase in list a becomes italicized in list b, then it wouldn't
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show up as modified in the resulting diff.
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@type a: [ unicode, ... ]
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@type b: [ unicode, ... ]
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@rtype: ( [ unicode, ... ], [ unicode, ... ] )
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@return: tuple of resulting list a and list b
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"""
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matcher = SequenceMatcher( None, a, b )
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result_a = []
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@ -112,9 +149,9 @@ class Html_differ( HTMLParser ):
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# go through the altered items looking for start and end tags
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for i in range( i1, i2 ):
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Html_differ.__track_open_tags( a[ i ], open_tags )
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Html_differ.track_open_tags( a[ i ], open_tags )
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for j in range( j1, j2 ):
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Html_differ.__track_open_tags( b[ j ], open_tags )
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Html_differ.track_open_tags( b[ j ], open_tags )
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if change_type == "replace":
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open_del_items.extend( a[ i1:i2 ] )
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@ -125,16 +162,23 @@ class Html_differ( HTMLParser ):
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open_ins_items.extend( b[ j1:j2 ] )
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if len( open_tags ) == 0:
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result_a.append( ''.join( open_del_items ) )
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result_b.append( ''.join( open_ins_items ) )
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if len( open_del_items ) > 0:
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result_a.append( ''.join( open_del_items ) )
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if len( open_ins_items ) > 0:
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result_b.append( ''.join( open_ins_items ) )
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open_del_items = []
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open_ins_items = []
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return ( result_a, result_b )
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def __diff_lists( self, a, b ):
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def diff_lists( self, a, b ):
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"""
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Diff two prepared lists and return the result as an HTML string.
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@type a: [ unicode, ... ]
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@type b: [ unicode, ... ]
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@rtype: unicode
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@return: composite HTML diff
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"""
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matcher = SequenceMatcher( None, a, b )
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result = []
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@ -0,0 +1,201 @@
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from controller.Html_differ import Html_differ
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class Test_html_differ( object ):
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def setUp( self ):
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self.differ = Html_differ()
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def test_convert_html_to_list( self ):
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result = self.differ.convert_html_to_list( u"foo <i>bar baz</i> quux" )
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assert len( result ) == 7
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assert result[ 0 ] == u"foo "
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assert result[ 1 ] == u"<i>"
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assert result[ 2 ] == u"bar "
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assert result[ 3 ] == u"baz"
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assert result[ 4 ] == u"</i>"
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assert result[ 5 ] == u" "
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assert result[ 6 ] == u"quux"
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def test_convert_html_to_list_with_character_ref( self ):
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result = self.differ.convert_html_to_list( u"foo # quux" )
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assert len( result ) == 4
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assert result[ 0 ] == u"foo "
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assert result[ 1 ] == u"#"
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assert result[ 2 ] == u" "
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assert result[ 3 ] == u"quux"
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def test_convert_html_to_list_with_entity_ref( self ):
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result = self.differ.convert_html_to_list( u"foo quux" )
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assert len( result ) == 4
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assert result[ 0 ] == u"foo "
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assert result[ 1 ] == u" "
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assert result[ 2 ] == u" "
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assert result[ 3 ] == u"quux"
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def test_diff_with_insert( self ):
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a = 'foo bar baz quux'
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b = 'foo bar whee baz quux'
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result = self.differ.diff( a, b )
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assert result == 'foo bar <ins class="diff">whee </ins>baz quux'
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def test_diff_with_delete( self ):
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a = 'foo bar baz quux'
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b = 'foo bar quux'
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result = self.differ.diff( a, b )
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assert result == 'foo bar <del class="diff">baz </del>quux'
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def test_diff_with_replace( self ):
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a = 'foo bar baz quux'
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b = 'foo bar whee quux'
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result = self.differ.diff( a, b )
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assert result == 'foo bar <del class="diff modified">baz </del><ins class="diff modified">whee </ins>quux'
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def test_diff_with_italics( self ):
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a = 'foo bar baz quux'
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b = 'foo <i>bar baz</i> quux'
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result = self.differ.diff( a, b )
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assert result == 'foo <del class="diff modified">bar baz </del><ins class="diff modified"><i>bar baz</i> </ins>quux'
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def test_diff_with_italics_and_insert( self ):
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a = 'foo bar baz quux'
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b = 'foo <i>bar whee baz</i> quux'
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result = self.differ.diff( a, b )
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assert result == 'foo <del class="diff modified">bar baz </del><ins class="diff modified"><i>bar whee baz</i> </ins>quux'
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def test_track_open_tags( self ):
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open_tags = []
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self.differ.track_open_tags( u"foo ", open_tags )
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assert open_tags == []
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self.differ.track_open_tags( u"<i>", open_tags )
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assert open_tags == [ u"i" ]
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self.differ.track_open_tags( u"bar ", open_tags )
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assert open_tags == [ u"i" ]
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self.differ.track_open_tags( u"<b>", open_tags )
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assert open_tags == [ u"i", u"b" ]
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self.differ.track_open_tags( u"baz", open_tags )
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assert open_tags == [ u"i", u"b" ]
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self.differ.track_open_tags( u"</b>", open_tags )
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assert open_tags == [ u"i" ]
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self.differ.track_open_tags( u"</i>", open_tags )
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assert open_tags == []
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self.differ.track_open_tags( u"quux", open_tags )
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assert open_tags == []
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def test_prepare_lists_with_insert( self ):
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a = [ 'foo ', 'bar ', 'baz ', 'quux' ]
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b = [ 'foo ', 'bar ', 'whee ', 'baz ', 'quux' ]
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result = self.differ.prepare_lists( a, b )
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assert len( result ) == 2
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( new_a, new_b ) = result
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# there should be no change
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assert new_a == a
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assert new_b == b
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def test_prepare_lists_with_delete( self ):
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a = [ 'foo ', 'bar ', 'baz ', 'quux' ]
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b = [ 'foo ', 'bar ', 'quux' ]
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result = self.differ.prepare_lists( a, b )
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assert len( result ) == 2
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( new_a, new_b ) = result
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# there should be no change
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assert new_a == a
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assert new_b == b
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def test_prepare_lists_with_replace( self ):
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a = [ 'foo ', 'bar ', 'baz ', 'quux' ]
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b = [ 'foo ', 'bar ', 'whee ', 'quux' ]
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result = self.differ.prepare_lists( a, b )
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assert len( result ) == 2
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( new_a, new_b ) = result
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# there should be no change
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assert new_a == a
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assert new_b == b
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def test_prepare_lists_with_italics( self ):
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a = [ 'foo ', 'bar ', 'baz ', 'quux' ]
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b = [ 'foo ', '<i>', 'bar ', 'baz', '</i> ', 'quux' ]
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result = self.differ.prepare_lists( a, b )
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assert len( result ) == 2
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( new_a, new_b ) = result
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# the elements within italics should be merged
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assert new_a == [ 'foo ', 'bar baz ', 'quux' ]
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assert new_b == [ 'foo ', '<i>bar baz</i> ', 'quux' ]
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def test_prepare_lists_with_italics_and_insert( self ):
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a = [ 'foo ', 'bar ', 'baz ', 'quux' ]
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b = [ 'foo ', '<i>', 'bar ', 'whee ', 'baz', '</i> ', 'quux' ]
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result = self.differ.prepare_lists( a, b )
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assert len( result ) == 2
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( new_a, new_b ) = result
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# the elements within italics should be merged
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assert new_a == [ 'foo ', 'bar baz ', 'quux' ]
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assert new_b == [ 'foo ', '<i>bar whee baz</i> ', 'quux' ]
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def test_diff_lists_with_insert( self ):
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a = [ 'foo ', 'bar ', 'baz ', 'quux' ]
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b = [ 'foo ', 'bar ', 'whee ', 'baz ', 'quux' ]
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result = self.differ.diff_lists( a, b )
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assert result == 'foo bar <ins class="diff">whee </ins>baz quux'
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def test_diff_lists_with_delete( self ):
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a = [ 'foo ', 'bar ', 'baz ', 'quux' ]
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b = [ 'foo ', 'bar ', 'quux' ]
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result = self.differ.diff_lists( a, b )
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assert result == 'foo bar <del class="diff">baz </del>quux'
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def test_diff_lists_with_replace( self ):
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a = [ 'foo ', 'bar ', 'baz ', 'quux' ]
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b = [ 'foo ', 'bar ', 'whee ', 'quux' ]
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result = self.differ.diff_lists( a, b )
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assert result == 'foo bar <del class="diff modified">baz </del><ins class="diff modified">whee </ins>quux'
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def test_diff_lists_with_italics( self ):
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a = [ 'foo ', 'bar baz ', 'quux' ]
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b = [ 'foo ', '<i>bar baz</i> ', 'quux' ]
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result = self.differ.diff_lists( a, b )
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assert result == 'foo <del class="diff modified">bar baz </del><ins class="diff modified"><i>bar baz</i> </ins>quux'
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def test_diff_lists_with_italics_and_insert( self ):
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a = [ 'foo ', 'bar baz ', 'quux' ]
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b = [ 'foo ', '<i>bar whee baz</i> ', 'quux' ]
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result = self.differ.diff_lists( a, b )
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assert result == 'foo <del class="diff modified">bar baz </del><ins class="diff modified"><i>bar whee baz</i> </ins>quux'
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