appypod-rattail/shared/css.py

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