def get_property_priority(self, css_class=''):
"""
Returns the keyword ``'important'`` or ``''``. These are in the form that ``cssutils`` understands.
:raises ValueError: If the css_class is empty or only contain whitespace values.
:type css_class: str
:param css_class: An encoded css class selector that may contain property name, value, and priority designator.
:return: (str) -- Returns the keyword ``important`` if the property priority is set to important.
Otherwise, it returns ''.
>>> property_parser = ClassPropertyParser()
>>> property_parser.get_property_priority('text-align-center-i')
'important'
>>> property_parser.get_property_priority('text-align-center')
''
>>> property_parser.get_property_priority('')
ValueError
>>> property_parser.get_property_priority(' ')
ValueError
"""
deny_empty_or_whitespace(string=css_class, variable_name='css_class')
return 'important' if self.is_important(css_class=css_class) else ''
def strip_priority_designator(self, css_class=''):
"""
Removes the priority designator, if necessary.
:raises ValueError: If the css_class is empty or only contain whitespace values.
:type css_class: str
:param css_class: A css_class that may or may not contain a priority designator.
:return: (str) -- If necessary, strip priority designator from the end of css_class and return the string.
If the importance_designator is not found, then it returns the unchanged css_class.
>>> property_parser = ClassPropertyParser()
>>> property_parser.strip_priority_designator('blink-i')
'blink'
>>> property_parser.strip_priority_designator('blink')
'blink'
>>> property_parser.strip_priority_designator('')
ValueError
>>> property_parser.strip_priority_designator(' ')
ValueError
"""
deny_empty_or_whitespace(string=css_class, variable_name='css_class')
if self.is_important(css_class=css_class):
return css_class[:-len(self.importance_designator)]
else:
return css_class
def is_important(self, css_class=''):
"""
Tests whether the css_class ends with the importance_designator.
:raises ValueError: If the css_class is empty or only contain whitespace values.
:type css_class: str
:param css_class: An encoded css class selector that may contain property name, value, and priority designator.
:return: (bool) -- Returns True if the css_class ends with the importance_designator. Otherwise, returns False.
**Examples:**
>>> property_parser = ClassPropertyParser()
>>> property_parser.is_important('line-through-i')
True
>>> property_parser.is_important('line-through')
False
>>> property_parser.is_important('')
ValueError
>>> property_parser.is_important(' ')
ValueError
"""
deny_empty_or_whitespace(string=css_class, variable_name='css_class')
return css_class.endswith(self.importance_designator)
def strip_property_abbreviation(self, property_name='', css_class=''):
"""
Strip property abbreviation from css_class if applicable and return the result.
:raises ValueError: If either property_name or css_class are empty or only contain whitespace values.
:type property_name: str
:type css_class: str
:param property_name: Presumed to match a key or value in the ``property_alias_dict``
:param css_class: Initially this value may or may not contain the property_name.
:return: (str) -- Returns the encoded property value portion of the css_class.
**Examples:**
>>> property_parser = ClassPropertyParser()
>>> property_parser.strip_property_abbreviation('color', 'c-lime')
'lime'
>>> property_parser.strip_property_abbreviation('', 'c-lime')
ValueError
>>> property_parser.strip_property_abbreviation('color', ' ')
ValueError
"""
deny_empty_or_whitespace(string=css_class, variable_name='css_class')
deny_empty_or_whitespace(string=property_name, variable_name='property_name')
property_abbreviations = self.get_property_abbreviations(property_name=property_name)
for property_abbreviation in property_abbreviations:
if css_class.startswith(property_abbreviation):
return css_class[len(property_abbreviation):]
return css_class
def strip_property_name(property_name='', css_class=''):
"""
Strip property name from css_class if applicable and return the css_class.
:raises ValueError: If either property_name or css_class are empty or only contain whitespace values.
:type property_name: str
:type css_class: str
:param property_name: Presumed to match a key or value in the ``property_alias_dict``.
:param css_class: This value may or may not be identical to the property_value.
:return: (str) -- Returns the encoded property value portion of the css_class.
**Examples:**
>>> ClassPropertyParser.strip_property_name('padding', 'padding-1-2-1-2')
'1-2-1-2'
>>> ClassPropertyParser.strip_property_name('font-weight', 'bold')
'bold'
>>> ClassPropertyParser.strip_property_name('', 'padding-1-2-1-2')
ValueError
>>> ClassPropertyParser.strip_property_name('font-weight', ' ')
ValueError
"""
deny_empty_or_whitespace(string=css_class, variable_name='css_class')
deny_empty_or_whitespace(string=property_name, variable_name='property_name')
property_name += '-' # Append '-' to property to match the class format.
if css_class.startswith(property_name): # Strip property name
return css_class[len(property_name):]
else: # If it doesn't have a property name ignore it.
return css_class
def __init__(self, css_class='', css_property=Property()):
deny_empty_or_whitespace(css_class, variable_name='css_class')
deny_empty_or_whitespace(css_property.cssText, variable_name='css_property')
self.css_class = css_class
self.css_property = css_property
self.scale_dict = {
'medium': 1.125,
'small': 1.25,
}
self.scaling_flag = '-s'
self.is_scaling = self._is_scaling()
def get_property_value(self, property_name='', encoded_property_value=''):
"""
Accepts an encoded_property_value that's been stripped of it's property named and priority
Uses CSSPropertyValueParser, and returns a valid css property value or ''.
Usage Note: Invalid CSS values can be returned by this method. CSS validation occurs at a later step.
:raises ValueError: If either property_name or css_class are empty or only contain whitespace values.
:type property_name: str
:type encoded_property_value: str
:param property_name: Name of CSS property that matches a key in ``property_alias_dict``.
:param encoded_property_value: A property value that may or may not contain dashes and underscores.
:return: (str) -- An unvalidated / potential CSS property value.
**Examples:**
>>> property_parser = ClassPropertyParser(set(), False) # Turn OFF unit conversion.
>>> property_parser.get_property_value('font-weight', 'bold') # Special case: alias == property value
'bold'
>>> property_parser.get_property_value('padding', '1-10-10-5') # Multi-value encoding contains dashes.
'1px 10px 10px 5px'
>>> property_parser.get_property_value('width', '7_25rem') # Single value contains underscores.
'7.25rem'
>>> property_parser.get_property_value('margin', '1ap-10xp-3qp-1mp3') # Invalid CSS returned.
'1a% 10x% 3q% 1mp3'
>>> property_parser.get_property_value('', 'c-lime')
ValueError
>>> property_parser.get_property_value('color', ' ')
ValueError
"""
deny_empty_or_whitespace(string=property_name, variable_name='property_name')
deny_empty_or_whitespace(string=encoded_property_value, variable_name='encoded_property_value')
value_parser = CSSPropertyValueParser(property_name=property_name)
value = value_parser.decode_property_value(value=encoded_property_value)
return value
def build_media_query(self):
""" Returns CSS media queries that scales pixel / em values in response to screen size changes.
**Generated CSS for ``font-size-24-s`` minus the inline comments**::
.font-size-24-s {
// Default size above medium
font-size: 24px;
// medium screen font size reduction
@media only screen and (max-width: 45.0em) {
font-size: 21.3px;
}
// small screen font size reduction
@media only screen and (max-width: 30.0em) {
font-size: 19.2px;
}
}
**Priority !important -- Generated CSS for ``font-size-24-s-i`` minus the inline comments**::
// Default size above the maximum 'medium' width breakpoint.
.font-size-24-s-i { font-size: 24px !important; }
// Apply 'medium' screen font size reduction.
@media only screen and (max-width: 45.0em) {
.font-size-24-s-i { font-size: 21.3px !important; }
}
// Apply 'small' screen font size reduction.
@media only screen and (max-width: 30.0em) {
.font-size-24-s-i { font-size: 19.2px !important; }
}
:return: (*str*) -- Returns CSS media queries that scales pixel / em values in response to screen size changes.
"""
if not self.is_scaling:
return ''
name = self.css_property.name
value = self.css_property.value
units = ''.join(filter(lambda x: x.isalpha(), value)) # Only keep letters.
priority = self.css_property.priority
deny_empty_or_whitespace(str(value), variable_name='value')
float_value = float(value.replace(units, '')) # Remove units.
_max = 1
small_max = small[_max]
medium_max = medium[_max]
medium_property = Property(name=name, value=value, priority=priority)
small_property = Property(name=name, value=value, priority=priority)
medium_value = round(float_value / self.scale_dict['medium'], 4) # Scale to medium screen
medium_value = str(medium_value) + units # Add units
small_value = round(float_value / self.scale_dict['small'], 4) # Scale to small screen
small_value = str(small_value) + units # Add units
medium_property.value = medium_value
small_property.value = small_value
return (
'.' + self.css_class + ' { ' + self.css_property.cssText + '; }\n\n' +
'@media only screen and (max-width: ' + medium_max + ') {\n' +
'\t.' + self.css_class + ' { ' + medium_property.cssText + '; }\n' +
'}\n\n' +
'@media only screen and (max-width: ' + small_max + ') {\n' +
'\t.' + self.css_class + ' { ' + small_property.cssText + '; }\n' +
'}\n\n'
)
def test_deny_empty_or_whitespace_valid(self):
self.assertEqual(deny_empty_or_whitespace(string='valid_string', variable_name='valid_variable'), None)
