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
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
def add_color_parenthetical(self, value=''):
""" Convert parenthetical color values: rbg, rbga, hsl, hsla to valid css format
Assumes that color conversion happens after dashes, decimal point, negative signs, and percentage signs
are converted.
**Note:** Currently not compatible with shorthand properties.
:type value: str
:param value: Space delimited rbg, rbga, hsl, hsla values.
:return: (str) -- Returns the valid css color parenthetical. Returns the input ``value`` unchanged
for the non-matching case.
**Examples:**
>>> color_parser = ColorParser('color', '')
>>> color_parser.add_color_parenthetical('rgb 0 255 0')
rgb(0, 255, 0)
>>> color_parser.add_color_parenthetical('rgba 255 0 0 0.5')
rgba(255, 0, 0, 0.5)
>>> color_parser.add_color_parenthetical('hsl 120 60% 70%')
hsl(120, 60%, 70%)
>>> color_parser.add_color_parenthetical('hsla 120 60% 70% 0.3')
hsla(120, 60%, 70%, 0.3)
>>> # Pass-through case as no conversion is possible.
>>> color_parser.add_color_parenthetical('hsla')
hsla
"""
if self.property_name_allows_color():
if contains_a_digit(string=value):
keywords = {'rgb ', 'rgba ', 'hsl ', 'hsla '}
for key in keywords:
if value.startswith(key):
value = value.replace(key, key.strip() + '(') # Remove key whitespace and add opening '('
value += ')' # Add closing ')'
value = value.replace(' ', ', ') # Add commas ', '
break
return value
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
def test_contains_a_digit_false(self):
no_digits = ['bold', 'none', 'left']
for value in no_digits:
self.assertFalse(contains_a_digit(string=value), msg=value)
def test_contains_a_digit_true(self):
digits = ['n12px', '1p 7p 1p 7p', '-1_25em', '-1.35%', 'rgba 255 0 0 0.5', 'h0ff48f']
for value in digits:
self.assertTrue(contains_a_digit(string=value), msg=value)