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115 lines
4.5 KiB
115 lines
4.5 KiB
# CSSPrefixer
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# Copyright 2010-2012 Greg V. <floatboth@me.com>
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from rules import prefixRegex, rules as tr_rules
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import cssutils
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import re
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keyframesRegex = re.compile(r'@keyframes\s?\w+\s?{(.*)}')
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blockRegex = re.compile(r'\w+\s?\{(.*)\}')
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def magic(ruleset, debug, minify, filt, parser):
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if isinstance(ruleset, cssutils.css.CSSUnknownRule):
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if ruleset.cssText.startswith('@keyframes'):
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inner = parser.parseString(keyframesRegex.split(ruleset.cssText.replace('\n', ''))[1])
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# BUG: doesn't work when minified
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s = '' if minify else '\n'
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return '@-webkit-keyframes {' + s + \
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''.join([magic(rs, debug, minify, ['webkit'], parser) for rs in inner]) \
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+ '}' + s + '@-moz-keyframes {' + s + \
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''.join([magic(rs, debug, minify, ['moz'], parser) for rs in inner]) \
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+ '}' + s + ruleset.cssText
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elif ruleset.cssText.startswith('from') or ruleset.cssText.startswith('to'):
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return ''.join([magic(rs, debug, minify, filt, parser)
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for rs in parser.parseString(blockRegex.sub(r'\1', ruleset.cssText.replace('\n', ''))[1])])
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else:
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return
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elif hasattr(ruleset, 'style'): # Comments don't
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ruleSet = set()
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rules = list()
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children = list(ruleset.style.children())
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ruleset.style = cssutils.css.CSSStyleDeclaration() # clear out the styles that were there
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for rule in children:
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if not hasattr(rule, 'name'): # comments don't have name
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rules.append(rule)
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continue
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name = prefixRegex.sub('', rule.name)
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if name in tr_rules:
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rule.name = name
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if rule.cssText in ruleSet:
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continue
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ruleSet.add(rule.cssText)
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rules.append(rule)
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ruleset.style.seq._readonly = False
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for rule in rules:
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if not hasattr(rule, 'name'):
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ruleset.style.seq.append(rule, 'Comment')
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continue
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processor = None
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try: # try except so if anything goes wrong we don't lose the original property
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if rule.name in tr_rules:
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processor = tr_rules[rule.name](rule)
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[ruleset.style.seq.append(prop, 'Property') for prop in processor.get_prefixed_props(filt) if prop]
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# always add the original rule
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if processor and hasattr(processor, 'get_base_prop'):
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ruleset.style.seq.append(processor.get_base_prop(), 'Property')
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else:
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ruleset.style.seq.append(rule, 'Property')
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except:
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if debug:
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print 'warning with ' + str(rule)
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ruleset.style.seq.append(rule, 'Property')
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ruleset.style.seq._readonly = True
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elif hasattr(ruleset, 'cssRules'):
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for subruleset in ruleset:
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magic(subruleset, debug, minify, filt, parser)
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cssText = ruleset.cssText
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if not cssText: # blank rules return None so return an empty string
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return
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if minify or not hasattr(ruleset, 'style'):
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return cssText
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return cssText + '\n'
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def process(string, debug = False, minify = False, filt = ['webkit', 'moz', 'o', 'ms'], **prefs):
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parser = cssutils.CSSParser(loglevel = 'CRITICAL')
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if minify:
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cssutils.ser.prefs.useMinified()
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else:
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cssutils.ser.prefs.useDefaults()
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# use the passed in prefs
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for key, value in prefs.iteritems():
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if hasattr(cssutils.ser.prefs, key):
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cssutils.ser.prefs.__dict__[key] = value
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results = []
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sheet = parser.parseString(string)
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for ruleset in sheet.cssRules:
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cssText = magic(ruleset, debug, minify, filt, parser)
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if cssText:
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results.append(cssText)
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# format with newlines based on minify
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joinStr = '' if minify else '\n'
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# Not using sheet.cssText - it's buggy:
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# it skips some prefixed properties.
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return joinStr.join(results).rstrip()
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__all__ = ['process']
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