def test_replace_h_with_hash_invalid_property_name(self):
invalid_property_name = 'width'
input_values = ['h0ff48f', 'hfff', 'habc123', 'hfdec78', 'h000', 'height', 'h1', 'h52', 'h0ghyz6', 'h0uk']
expected_values = input_values
color_parser = ColorParser(property_name=invalid_property_name)
for i, value in enumerate(input_values):
self.assertEqual(
color_parser.replace_h_with_hash(value=value),
expected_values[i],
msg=value
)
def test_replace_h_with_hash_valid_shorthand_property_name(self):
valid_property_name = 'border'
input_values = ['5px solid hd0da1a', '13px dashed hd0d', '9px hidden hc0d', ]
expected_values = ['5px solid #d0da1a', '13px dashed #d0d', '9px hidden #c0d', ]
color_parser = ColorParser(property_name=valid_property_name)
for i, value in enumerate(input_values):
self.assertEqual(
color_parser.replace_h_with_hash(value=value),
expected_values[i],
msg=value
)
def test_add_color_parenthetical_invalid_property_name(self):
# rgb: rgb 0 255 0 --> rgb(0, 255, 0)
# rgba: rgba 255 0 0 0.5 --> rgba(255, 0, 0, 0.5)
# hsl: hsl 120 60% 70% --> hsl(120, 60%, 70%)
# hsla: hsla 120 60% 70% 0.3 --> hsla(120, 60%, 70%, 0.3)
input_values = ['rgb 0 255 0', 'rgba 255 0 0 0.5', 'hsl 120 60% 70%', 'hsla 120 60% 70% 0.3', 'blue', '#000']
expected_values = input_values
color_parser = ColorParser()
for i, value in enumerate(input_values):
self.assertEqual(
color_parser.add_color_parenthetical(value=value),
expected_values[i],
msg=value
)
def test_property_name_allows_color(self):
property_names_true = {
'color', 'background-color', 'border-color', 'border-top-color', 'border-right-color',
'border-bottom-color',
'border-left-color', 'outline_color',
'background', 'border-top', 'border-right', 'border-bottom', 'border-left', 'border', 'outline',
}
property_names_false = {'font-weight', 'padding', 'height', 'width', 'float'}
color_parser = ColorParser()
for property_name in property_names_true:
color_parser.property_name = property_name
self.assertTrue(color_parser.property_name_allows_color())
for property_name in property_names_false:
color_parser.property_name = property_name
self.assertFalse(color_parser.property_name_allows_color())
def test_is_valid_hex_Integer_case(self):
values_true = [
'h0ff48f', 'hfff', ' hABC123 ', 'hfdec78', 'h000', ' hbcd ', '5px solid hd0d', '5px-hidden-hd0d987',
'13px dashed hd0d',
'h000-i', 'h484848-i',
'hd9d-hover', 'hd9d9d8-hover', 'hf2f-hover-i', 'hF3F-i-hover',
'hf2f2f2-hover-i', 'hf3f3f3-i-hover',
]
expected = [
0, 0, 1, 0, 0, 1, 10, 11,
12,
0, 0,
0, 0, 0, 0,
0, 0,
]
color_parser = ColorParser()
for i, value in enumerate(values_true):
self.assertEqual(color_parser.find_h_index(value), expected[i], msg=value)
def __init__(self, property_name=''):
self.property_name = property_name
self.color_parser = ColorParser(property_name=property_name)
self.unit_parser = UnitParser(property_name=property_name)
class CSSPropertyValueParser(object):
"""
Accepts a ``property_name`` and ``use_em`` unit conversion flag.
Contains multiple parsers and methods that decodes the CSS property_value.
:type property_name: str
:param property_name: A CSS property name.
:return: None
**Attributes:**
**property_name** (*str*) -- A CSS property name. Not allowed to be ``''`` or None.
**color_parser** (*ColorParser*) -- Parses encoded color values.
**unit_parser** (*UnitParser*) -- Parses encoded unit values, and handles unit conversion.
**Important note about methods:**
These methods are intended to be called in the order they are defined inside the class.
"""
def __init__(self, property_name=''):
self.property_name = property_name
self.color_parser = ColorParser(property_name=property_name)
self.unit_parser = UnitParser(property_name=property_name)
def is_built_in(self, value=''):
""" Checks if the encoded ``value`` identically matches a value built-in to the CSS standard.
Returns True if ``value`` matches a CSS built-in valued and False if it does not.
Examples include: 'bold', 'italic', 'w-resize', 'arial', etc.
:type value: str
:param value: Encoded CSS property value.
:return: (*bool*)
- Returns ``True`` if ``value`` matches a CSS built-in valued and ``False`` if it does not.
- The values 'bold', 'italic', 'w-resize', 'arial' all return ``True``.
- The values '-bold', 'fw-', 'color-' all return ``False``.
- Invalid ``self.property_name`` also returns ``False`` (KeyError Case).
**Examples:**
>>> value_parser = CSSPropertyValueParser(
>>> property_name='font-weight', use_em=True
>>> )
>>> value_parser.is_built_in('bold')
True
>>> value_parser = CSSPropertyValueParser(
>>> property_name='padding', use_em=True
>>> )
>>> value_parser.is_built_in('7-4-7-4')
False
>>> value_parser = CSSPropertyValueParser(
>>> property_name='InvalidCSSPropertyName', use_em=True
>>> )
>>> value_parser.is_built_in('italic')
False
"""
if value.startswith('-') or value.endswith('-'):
return False
try:
aliases = property_alias_dict[self.property_name]
return True if value in aliases else False
except KeyError:
return False
@staticmethod
def replace_dashes(value=''):
""" Remove leading and trailing dashes. Replace internal dashes with spaces. Return the modified value.
``-`` becomes either ``''`` or ``' '``.
:type value: str
:param value: Encoded CSS property value.
:return: (*str*) -- Return the value with dashes removed if necessary.
>>> # Delete leading dash '-bold' --> 'bold'
>>> value_parser = CSSPropertyValueParser(
>>> property_name='font-weight', use_em=True
>>> )
>>> value_parser.replace_dashes('-bold')
'bold'
>>> #
>>> # Delete trailing 'white-' --> 'white'
>>> value_parser = CSSPropertyValueParser(
>>> property_name='color', use_em=True
>>> )
>>> value_parser.replace_dashes('white-')
'white'
>>> #
>>> # Replace internal '1-5-1-5' --> '1 5 1 5'
>>> value_parser = CSSPropertyValueParser(
>>> property_name='padding', use_em=True
>>> )
>>> value_parser.replace_dashes('1-5-1-5')
'1 5 1 5'
"""
value = value[1:] if value.startswith('-') else value
value = value[:-1] if value.endswith('-') else value
return value.replace('-', ' ')
@staticmethod
def replace_underscore_with_decimal(value=''):
""" Replace underscore with decimal point. Underscores are used to encode a decimal point
``'_'`` becomes ``'.'``
:type value: str
:param value: Encoded CSS property value.
:return: (*str*) -- Return the value with decimal points added if necessary.
**Example**
>>> value_parser = CSSPropertyValueParser(
>>> property_name='padding', use_em=True
>>> )
>>> value_parser.replace_underscore_with_decimal('1_32rem')
'1.32rem'
"""
if contains_a_digit(string=value):
value = value.replace('_', '.')
return value
@staticmethod
def replace_p_with_percent(value=''):
""" Replace ``'p'`` suffix with ``'%'`` if found at the end of any substring containing digits.
``'p '`` becomes ``'%'``
Mind the space
:type value: str
:param value: Encoded CSS property value.
:return: (*str*) -- Return the value with percent signs added if necessary.
**Example:**
>>> # Multi-value: '1p 10p 3p 1p' --> '1% 10% 3% 1%'
>>> value_parser = CSSPropertyValueParser(
>>> property_name='padding', use_em=True
>>> )
>>> value_parser.replace_p_with_percent(value='1p 10p 3p 1p')
'1% 10% 3% 1%'
>>> #
>>> # Single value ' 1p' --> ' 1%'
>>> value_parser = CSSPropertyValueParser(
>>> property_name='padding', use_em=True
>>> )
>>> value_parser.replace_p_with_percent(value=' 1p')
' 1%'
"""
if contains_a_digit(string=value):
value = value.replace('p ', '% ')
if value.endswith('p'):
value = value[:-1] + '%' # chop last character and add percentage sign
return value
@staticmethod
def replace_n_with_minus(value=''):
""" If a space plus the letter ``' n'`` is immediately followed by a digit replace it with ``' -'``.
If ``n`` is the first letter of the string and followed by digits replace it with ``-``.
The letter ``n`` is an encoding for a negative sign. Leaves other ``n's`` unmodified.
| ``' n2'`` becomes ``' -2'`` Mind the space.
| ``'n5'`` becomes ``'-5'``
:type value: str
:param value: Encoded CSS property value.
:return: (*str*) -- Return the value with minus signs added if necessary.
**Example:**
>>> # Multi-value: 'n5cm n6cm' --> '-5cm -6cm'
>>> value_parser = CSSPropertyValueParser(
>>> property_name='padding', use_em=True
>>> )
>>> value_parser.replace_n_with_minus('n5cm n6cm')
'-5cm -6cm'
>>> #
>>> # 'n9in' --> '-9in' (note that the 'n' at the end is not touched)
>>> value_parser.replace_n_with_minus('n9in')
'-9in'
"""
if contains_a_digit(string=value):
value = value.replace(' n', ' -')
if value.startswith('n'):
value = '-' + value[1:] # add minus sign and chop first character
return value
# Put everything together.
def decode_property_value(self, value=''):
"""
Decode the encoded property ``value`` input e.g. 'bold', '1-5-1-5', '1_32rem', '1p-10p-3p-1p', 'n12px',
'n5_25cm-n6_1cm'. Returns parsed, but non-validated CSS property value.
:type value: str
:param value: An encoded CSS property value.
:return: (*str*) -- Returns the decoded, but non-validated CSS property value.
**Examples:**
>>> value_parser = CSSPropertyValueParser(
>>> property_name='padding', use_em=True
>>> )
>>> value_parser.decode_property_value(value='1-5-1-5')
'0.0625em 0.3125em 0.0625em 0.3125em'
>>> value_parser.unit_parser.use_em = False
>>> value_parser.decode_property_value(value='1-5-1-5')
'1px 5px 1px 5px'
"""
# Skip values that are built-in to the CSS standard, and represent the literal property value.
if not self.is_built_in(value=value):
# Apply to all non-built-in values.
value = self.replace_dashes(value=value)
# These only apply if value contains a digit.
value = self.replace_underscore_with_decimal(value=value)
value = self.replace_p_with_percent(value=value)
value = self.replace_n_with_minus(value=value)
# Parse color and units
value = self.color_parser.replace_h_with_hash(value=value)
value = self.color_parser.add_color_parenthetical(value=value)
value = self.unit_parser.add_units(property_value=value)
else:
# Generate web safe font-family fallback strings.
if self.property_name == 'font-family':
font_parser = FontParser(font_value=value)
value = font_parser.generate_fallback_fonts()
return value
@staticmethod
def property_is_valid(name='', value='', priority=''):
""" Detects if a given property name, value, and priority combination is valid. Returns True if the
combination is valid, and false otherwise.
Validation occurs after the property value is decoded.
:param name: CSS property name
:param value: Decoded CSS property value
:param priority: CSS priority designator
:return: (*bool*) -- Returns True if the CSS property name, value, and priority
combination is valid, and false otherwise.
**Examples:**
>>> value_parser = CSSPropertyValueParser()
>>> value_parser.property_is_valid(
>>> name='padding', value='1px', priority=''
>>> )
True
>>> value_parser.property_is_valid(
>>> name='padding', value='invalid', priority=''
>>> )
False
"""
try:
css_property = Property(name=name, value=value, priority=priority)
is_valid = css_property.valid
return is_valid
except SyntaxErr:
return False
def test_is_valid_hex_None_case(self):
values_false = ['height', 'h1', 'h52', 'hbbb4', 'h00005', 'h0ghyz6', 'h0uk']
color_parser = ColorParser()
for value in values_false:
self.assertEqual(color_parser.find_h_index(value), None, msg=value)
