64 lines
2.6 KiB
Python
64 lines
2.6 KiB
Python
# ------------------------------------------------------------------------------
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import re
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# ------------------------------------------------------------------------------
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def parseStyleAttribute(value, asDict=False):
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'''Returns a list of CSS (name, value) pairs (or a dict if p_asDict is
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True), parsed from p_value, which holds the content of a HTML "style"
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tag.'''
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if asDict: res = {}
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else: res = []
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for attr in value.split(';'):
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if not attr.strip(): continue
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name, value = attr.split(':')
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if asDict: res[name.strip()] = value.strip()
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else: res.append( (name.strip(), value.strip()) )
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return res
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# ------------------------------------------------------------------------------
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class CssValue:
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'''Represents a CSS value having unit "px" or "%": value and unit are
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extracted in attributes of the same name. If no unit is specified, "px"
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is assumed.'''
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valueRex = re.compile('(\d+)(%|px)?')
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def __init__(self, value):
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value, unit = CssValue.valueRex.match(value)
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if not unit: unit = 'px'
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self.value = int(value)
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self.unit = unit
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def __str__(self): return '%d%s' % (self.value, self.unit)
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def __repr__(self): return self.__str__()
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class CssStyles:
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'''This class represents a set of styles collected from:
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* an HTML "style" attribute;
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* other attributes like "width".
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'''
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# The list of CSS properties having a unit (px or %)
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withUnit = ('width', 'height')
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def __init__(self, elem, attrs):
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'''Analyses styles as found in p_attrs and sets, for every found style,
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an attribute on self.'''
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# First, parse the "style" attr if present
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if attrs.has_key('style'):
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styles = parseStyleAttribute(attrs['style'], asDict=True)
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for name, value in styles.iteritems():
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if name in CssStyles.withUnit:
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value = CssValue(value)
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setattr(self, name.replace('-', ''), value)
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# Parse attributes "width" and "height" if present. But they will not
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# override corresponding attributes from the "styles" attributes if
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# found.
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for name in ('width', 'height'):
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if not hasattr(self, name) and attrs.has_key(name):
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setattr(self, name, CssValue(attrs[name]))
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def __repr__(self):
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res = '<CSS'
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for name, value in self.__dict__.iteritems():
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res += ' %s:%s' % (name, value)
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return res + '>'
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# ------------------------------------------------------------------------------
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