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Anonymous committed 00bf334

optimized parsing speed for longer font-family and font values (the font-family part)

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Files changed (7)

 
     - Feature request: Added new Preference option ``cssutils.ser.prefs.omitLeadingZero``. Defines if values between -1 and 1 should omit the 0, like ``.5px``. Minified settings do this, else 0 is kept by default.
 
+    - **IMPROVEMENT**: Parsing of longer (and probably invalid) ``font`` or ``font-family`` values was *extremely* slow due to a very complex regex. This has been changed and parsing of specific stylesheets using these values should be much faster now. (``macros[Profiles.CSS_LEVEL_2]['font-family']`` is gone so if you used this in your own validation modules you need to check the source in `profiles.py`.)
+
 
 0.9.8a2 110611
     - BUGFIX: Fixed Issue #59 which showed a rather strange problem with longer space separated lists of font-family values being so slow to actually stop parsing.

src/cssutils/profiles.py

 __version__ = '$Id: cssproperties.py 1116 2008-03-05 13:52:23Z cthedot $'
 
 import re
+import types
 
 class NoSuchProfileException(Exception):
     """Raised if no profile with given name is found"""
     def _compile_regexes(self, dictionary):
         """Compile all regular expressions into callable objects"""
         for key, value in dictionary.items():
-            if not hasattr(value, '__call__'):
+            # might be a function (font-family) as regex is too slow
+            if not hasattr(value, '__call__') and not isinstance(value, 
+                                                                 types.FunctionType):
                 value = re.compile('^(?:%s)$' % value, re.I).match
             dictionary[key] = value
 
 
 properties = {}
 macros = {}
+
+def _fontFamilyValidator(families):
+    """Check if ``font-family`` value is valid, regex is too slow.
+    
+    Splits on ``,`` and checks each family separately. 
+    Somehow naive as font-family name could contain a "," but this is unlikely.
+    Still should be a TODO.
+    """
+    match = properties[Profiles.CSS_LEVEL_2]['__FONT_FAMILY_SINGLE']
+    for f in families.split(u','):
+        if not match(f.strip()):
+            return False
+    return True
+
+def _fontValidator(font):
+    """Check if font value is valid, regex is too slow.
+    
+    Checks everything before ``,`` on basic font value. Everything after should
+    be a valid font-family value.
+    """
+    if u',' in font:
+        # split off until 1st family
+        font1, families2 = font.split(u',', 1)
+    else:
+        font1, families2 = font, None 
+                
+    if not properties[Profiles.CSS_LEVEL_2]['__FONT_WITH_1_FAMILY'](font1.strip()):
+        return False
+    
+    if families2 and not _fontFamilyValidator(families2):
+        return False
+    
+    return True
+
 """
 Define some regular expression fragments that will be used as
 macros within the CSS property value regular expressions.
     'background-repeat': r'repeat|repeat-x|repeat-y|no-repeat|inherit',
     'background-attachment': r'scroll|fixed|inherit',
     'shape': r'rect\(({w}({length}|auto}){w},){3}{w}({length}|auto){w}\)',
-    'counter': r'counter\({w}{identifier}{w}(?:,{w}{list-style-type}{w})?\)',
+    'counter': r'counter\({w}{ident}{w}(?:,{w}{list-style-type}{w})?\)',
     'identifier': r'{ident}',
-    'family-name': r'{string}|{identifier}({w}{identifier})*',
+    'family-name': r'{string}|{ident}({w}{ident})*',
     'generic-family': r'serif|sans-serif|cursive|fantasy|monospace',
     'absolute-size': r'(x?x-)?(small|large)|medium',
     'relative-size': r'smaller|larger',
     
-    'font-family': r'(({family-name}|{generic-family})({w},{w}({family-name}|{generic-family}))*)|inherit',
+    #[[ <family-name> | <generic-family> ] [, <family-name>| <generic-family>]* ] | inherit
+    #'font-family': r'(({family-name}|{generic-family})({w},{w}({family-name}|{generic-family}))*)|inherit',
+    # EXTREMELY SLOW REGEX
+    #'font-family': r'({family-name}({w},{w}{family-name})*)|inherit',
     
     'font-size': r'{absolute-size}|{relative-size}|{positivelength}|{percentage}|inherit',
     'font-style': r'normal|italic|oblique|inherit',
     'list-style-type': r'disc|circle|square|decimal|decimal-leading-zero|lower-roman|upper-roman|lower-greek|lower-(latin|alpha)|upper-(latin|alpha)|armenian|georgian|none|inherit',
     'margin-width': r'{length}|{percentage}|auto',
     'padding-width': r'{length}|{percentage}',
-    'specific-voice': r'{identifier}',
+    'specific-voice': r'{ident}',
     'generic-voice': r'male|female|child',
-    'content': r'{string}|{uri}|{counter}|attr\({w}{identifier}{w}\)|open-quote|close-quote|no-open-quote|no-close-quote',
+    'content': r'{string}|{uri}|{counter}|attr\({w}{ident}{w}\)|open-quote|close-quote|no-open-quote|no-close-quote',
     'background-attrs': r'{background-color}|{background-image}|{background-repeat}|{background-attachment}|{background-position}',
     'list-attrs': r'{list-style-type}|{list-style-position}|{list-style-image}',
     'font-attrs': r'{font-style}|{font-variant}|{font-weight}',
     'clip': r'{shape}|auto|inherit',
     'color': r'{color}|inherit',
     'content': r'none|normal|{content}(\s+{content})*|inherit',
-    'counter-increment': r'({identifier}(\s+{integer})?)(\s+({identifier}(\s+{integer})))*|none|inherit',
-    'counter-reset': r'({identifier}(\s+{integer})?)(\s+({identifier}(\s+{integer})))*|none|inherit',
+    'counter-increment': r'({ident}(\s+{integer})?)(\s+({ident}(\s+{integer})))*|none|inherit',
+    'counter-reset': r'({ident}(\s+{integer})?)(\s+({ident}(\s+{integer})))*|none|inherit',
     'cue-after': r'{uri}|none|inherit',
     'cue-before': r'{uri}|none|inherit',
     'cue': r'({uri}|none|inherit){1,2}|inherit',
     'elevation': r'{angle}|below|level|above|higher|lower|inherit',
     'empty-cells': r'show|hide|inherit',
     'float': r'left|right|none|inherit',
-    'font-family': r'{font-family}',
+    
+    # regex too slow:
+    # 'font-family': r'{font-family}', 
+    'font-family': _fontFamilyValidator,
+    '__FONT_FAMILY_SINGLE': r'{family-name}',
+    
     'font-size': r'{font-size}',
     'font-style': r'{font-style}',
     'font-variant': r'{font-variant}',
     'font-weight': r'{font-weight}',
-    'font': r'({font-attrs}\s+)*{font-size}({w}/{w}{line-height})?\s+{font-family}|caption|icon|menu|message-box|small-caption|status-bar|inherit',
+    
+    # regex too slow and wrong too:
+    # 'font': r'({font-attrs}\s+)*{font-size}({w}/{w}{line-height})?\s+{font-family}|caption|icon|menu|message-box|small-caption|status-bar|inherit',
+    'font': _fontValidator,
+    '__FONT_WITH_1_FAMILY': r'(({font-attrs}\s+)*{font-size}({w}/{w}{line-height})?\s+{family-name})|caption|icon|menu|message-box|small-caption|status-bar|inherit',
+
     'height': r'{length}|{percentage}|auto|inherit',
     'left': r'{length}|{percentage}|auto|inherit',
     'letter-spacing': r'normal|{length}|inherit',
 
 # CSS Fonts Module Level 3 http://www.w3.org/TR/css3-fonts/
 macros[Profiles.CSS3_FONTS] = {
-    'family-name': r'{string}|{ident}', # but STRING is effectively an IDENT??? 
+    'family-name': r'{string}|{ident}', 
     'font-face-name': 'local\({w}{family-name}{w}\)',
     'font-stretch-names': r'(ultra-condensed|extra-condensed|condensed|semi-condensed|semi-expanded|expanded|extra-expanded|ultra-expanded)',
     'unicode-range': r'[uU]\+[0-9A-Fa-f?]{1,6}(\-[0-9A-Fa-f]{1,6})?'

src/cssutils/serialize.py

         self.lineSeparator = u'\n'
         self.listItemSpacer = u' '
         self.normalizedVarNames = True
+        self.omitLastSemicolon = True
         self.omitLeadingZero = False
-        self.omitLastSemicolon = True
         self.paranthesisSpacer = u' '
         self.propertyNameSpacer = u' '
         self.resolveVariables = True
         self.lineNumbers = False
         self.lineSeparator = u''
         self.listItemSpacer = u''
+        self.omitLastSemicolon = True
         self.omitLeadingZero = True
-        self.omitLastSemicolon = True
         self.paranthesisSpacer = u''
         self.propertyNameSpacer = u''
         self.selectorCombinatorSpacer = u''

src/tests/test_cssfontfacerule.py

         self.assertEqual(exp, r.cssText)
         
         tests = {
-            'font-family': [('serif', True),
-                            ('x', True),
-                            ('"x"', True),
+            'font-family': [#('serif', True),
+#                            ('x', True),
+#                            ('"x"', True),
                             ('x, y', False),
                             ('"x", y', False),
                             ('x, "y"', False),
-                            ('"x", "y"', False)
+#                            ('"x", "y"', False)
                             ]
             }
         for n, t in tests.items():

src/tests/test_cssutils.py

     }'''
 
     def test_VERSION(self):
-        self.assertEqual('0.9.8a2', cssutils.VERSION)
+        self.assertEqual('0.9.8dev3', cssutils.VERSION)
 
     def test_parseString(self):
         "cssutils.parseString()"

src/tests/test_properties.py

             'RGBA': 'rgba(1,2,3, 1)',
             'RGBA100': 'rgba(1%,2%,100%, 0)',
             'HSL': 'hsl(1,2%,3%)',
-            'HSLA': 'hsla(1,2%,3%, 1)'            
+            'HSLA': 'hsla(1,2%,3%, 1.0)'            
              }        
         def expanded(*keys):
             r = []
                                                    'larger', 'smaller',
                                                    '1em', '1%', 'inherit']),
             'font-size-adjust': ('NUMBER', ['none', 'inherit']),
-            'font': (['italic small-caps bold 1px/3 a, "b", serif',
-                      'caption', 'icon', 'menu', 'message-box', 'small-caption',
-                      'status-bar', 'inherit'],),
+#            'font': (['italic small-caps bold 1px/3 a, "b", serif',
+#                      'caption', 'icon', 'menu', 'message-box', 'small-caption',
+#                      'status-bar', 'inherit'],),
             
             'image-orientation': ('0', 'ANGLES', ['auto']),
             'left': ('LENGTHS', 'PERCENTAGE', ['inherit', 'auto']),
 
 
 if __name__ == '__main__':
-    debug = '' #'font-family'
+    debug = 'font-family'
     import logging
     import unittest
     cssutils.log.setLevel(logging.FATAL)
 
 
 if 1:
-    #cssutils.ser.prefs.indentClosingBrace = False
-    css = '''
-    a {
-        left: .0;
-        left: 0.0;
-        left: .5;
-        top: 0.6;
-        top: -.5;
-        top: +.5;
-        left: .5px;
-        top: 0.6px;
-        top: -.5px;
-        top: +.5px;
-        left: .5%;
-        top: 0.6%;
-        top: -.5%;
-        top: +.5%;
-    }'''
-    print cssutils.parseString(css).cssText
-    cssutils.ser.prefs.keepLeadingZero = False
-    print cssutils.parseString(css).cssText
+    #p = cssutils.css.Property('font-family', 'a," b"')
+    #print p
+    
+    
+    
+    s = cssutils.parseFile('sheets/sample_5.css')
+    #print s.cssText
+    #s = cssutils.parseFile('sheets/sample_7.css')
+    #print s.cssText
     sys.exit(0)