def _convert_impl(self, cssss, resource):
# CSS Rule List
cssrl = cssss.cssRules
# 遍历各个Rule
for rule in cssss.cssRules:
if rule.type != 1:
continue
# rule的类型是CSSStyleRule
style = rule.style # CSSStyleDeclaration
properties = style.getProperties() # list<cssutils.css.Property>
new_props = []
for p in properties:
key = p.name
value = p.cssValue
new_prop = None
if key.endswith('background') or \
key.endswith('background-image'):
if value.cssValueType == value.CSS_VALUE_LIST:
for k in value:
if k.primitiveType == k.CSS_URI:
# logging.warning(k.getStringValue())
uri_path = k.getStringValue()
# 如果图片时png，且该png不是png8格式（通过命名区分），则进行转换并加上ie6的css hack
if uri_path.endswith('.png') and not uri_path.endswith('-fs8.png'):
# create property _background or _background-image
new_uri = self._convert_image(resource, uri_path)
if new_uri:
new_prop = Property()
new_prop.cssText = p.cssText.replace('background', '_background').replace(uri_path, new_uri)
elif value.cssValueType == value.CSS_PRIMITIVE_VALUE and \
value.primitiveType == value.CSS_URI:
uri_path = value.getStringValue()
# 如果图片时png，且该png不是png8格式（通过命名区分），则进行转换并加上ie6的css hack
if uri_path.endswith('.png') and not uri_path.endswith('-fs8.png'):
# create property _background or _background-image
new_uri = self._convert_image(resource, uri_path)
if new_uri:
new_prop = Property('_' + key, cssutils.helper.uri(new_uri))
if new_prop:
new_props.append(new_prop)
# 往rule.style里面添加hack的property
for x in new_props:
style.setProperty(x)
return cssss.cssText
