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Refactor assign_properties() into several functions.
This commit is contained in:
Simon Sapin
parent
4d15cd6795
commit
6c9e97515e
145
weasy/css.py
145
weasy/css.py
@ -239,6 +239,91 @@ def apply_style_rule(rule, document, origin):
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element.applicable_properties.append((precedence, prop))
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def handle_style_attribute(element):
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"""
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Return the element’s ``applicable_properties`` list after adding properties
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from the `style` attribute.
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"""
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declarations = getattr(element, 'applicable_properties', [])
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style_attribute = element.get('style')
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if style_attribute:
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# TODO: no href for parseStyle. What about relative URLs?
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# CSS3 says we should resolve relative to the attribute:
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# http://www.w3.org/TR/css-style-attr/#interpret
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for prop in parseStyle(style_attribute):
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precedence = (
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declaration_precedence('author', prop.priority),
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# 1 for being a style attribute, 0 as there is no selector.
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(1, 0, 0, 0)
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)
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declarations.append((precedence, prop))
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return declarations
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def handle_inheritance(element):
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"""
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The specified value is the parent element’s computed value iif one of the
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following is true:
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* The cascade did not result in a value, and the the property is inherited
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* The the value is the keyword 'inherit'.
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"""
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style = element.style
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parent = element.getparent()
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if parent is None: # root element
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for name, value in style.iteritems():
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# The PropertyValue object has value attribute
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if value.value == 'inherit':
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# The root element can not inherit from anything:
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# use the initial value.
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style[name] = Value('initial')
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else:
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# The parent appears before in tree order, so we should already have
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# finished with its computed values.
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for name, value in style.iteritems():
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if value.value == 'inherit':
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style[name] = parent.style[name]
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for name in properties.INHERITED:
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if name not in style:
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style[name] = parent.style[name]
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def handle_initial_values(element):
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"""
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Properties that do not have a value after inheritance or whose value is the
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'initial' keyword (CSS3) get their initial value.
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"""
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style = element.style
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for name, initial in properties.INITIAL_VALUES.iteritems():
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# Explicit 'initial' values are new in CSS3
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# http://www.w3.org/TR/css3-values/#computed0
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if style.get(name, Value('initial')).value == 'initial':
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style[name] = initial
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# Special cases for initial values that can not be expressed as CSS
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# border-color: same as color
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for name in ('border-top-color', 'border-right-color',
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'border-bottom-color', 'border-left-color'):
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if style.get(name, Value('initial')).value == 'initial':
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style[name] = style['color']
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# text-align: left in left-to-right text, right in right-to-left
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if style.get('text-align', Value('initial')).value == 'initial':
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if style['direction'].value == 'rtl':
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style['text-align'] = Value('right')
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else:
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style['text-align'] = Value('left')
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def handle_computed_values(element):
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"""
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Normalize values as much as possible without rendering the document.
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"""
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style = element.style
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parent = element.getparent()
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# TODO: http://www.w3.org/TR/css3-values/#computed0
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def assign_properties(document):
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"""
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For every element of the document, take the properties left by
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@ -247,19 +332,8 @@ def assign_properties(document):
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"""
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build_lxml_proxy_cache(document)
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for element in document.iter():
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declarations = getattr(element, 'applicable_properties', [])
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style_attribute = element.get('style')
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if style_attribute:
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# TODO: no href for parseStyle. What about relative URLs?
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# CSS3 says we should resolve relative to the attribute:
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# http://www.w3.org/TR/css-style-attr/#interpret
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for prop in parseStyle(style_attribute):
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precedence = (
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declaration_precedence('author', prop.priority),
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# 1 for being a style attribute, 0 as there is no selector.
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(1, 0, 0, 0)
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)
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declarations.append((precedence, prop))
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declarations = handle_style_attribute(element)
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# If apply_style_rule() was called in appearance order, the stability
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# of Python's sort fulfills rule 4 of the cascade.
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# This lambda has one parameter deconstructed as a tuple
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@ -267,50 +341,11 @@ def assign_properties(document):
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element.style = style = {}
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for precedence, prop in declarations:
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style[prop.name] = prop.propertyValue
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### Inheritance
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parent = element.getparent()
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if parent is None: # root element
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for name, value in style.iteritems():
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# The PropertyValue object has value attribute
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if value.value == 'inherit':
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# So root element can not inherit from anything:
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# use the initial value.
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style[name] = Value('initial')
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else:
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# The parent appears before in tree order, so we should already have
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# finished with its computed values.
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for name, value in style.iteritems():
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if value.value == 'inherit':
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style[name] = parent.style[name]
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for name in properties.INHERITED:
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if name not in style:
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style[name] = parent.style[name]
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handle_inheritance(element)
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handle_initial_values(element)
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handle_computed_values(element)
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### Properties that do not have a value yet get the initial value
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for name, initial in properties.INITIAL_VALUES.iteritems():
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# Explicit 'initial' values are new in CSS3
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# http://www.w3.org/TR/css3-values/#computed0
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if style.get(name, Value('initial')).value == 'initial':
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style[name] = initial
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# Special cases for initial values that can not be expressed as CSS
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for name in ('border-top-color', 'border-right-color',
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'border-bottom-color', 'border-left-color'):
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if style.get(name, Value('initial')).value == 'initial':
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style[name] = style['color']
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if style.get('text-align', Value('initial')).value == 'initial':
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if style['direction'].value == 'rtl':
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style['text-align'] = Value('right')
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else:
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style['text-align'] = Value('left')
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# TODO: computed values
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# http://www.w3.org/TR/css3-values/#computed0
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def annotate_document(document, user_stylesheets=None, ua_stylesheets=None,
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medium='print'):
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