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from scss.expression import Calculator
from scss.functions.core import CORE_LIBRARY
from scss.rule import Namespace
from scss.types import Color, List, Null, Number, String
import pytest
@pytest.fixture
def calc():
return Calculator().evaluate_expression
def assert_strict_string_eq(expected, actual):
assert expected.value == actual.value
assert expected.quotes == actual.quotes
def test_reference_operations():
"""Test the example expressions in the reference document:
http://sass-lang.com/docs/yardoc/file.SASS_REFERENCE.html#operations
"""
# TODO: break this into its own file and add the entire reference guide
# Need to build the calculator manually to get at its namespace, and need
# to use calculate() instead of evaluate_expression() so interpolation
# works
ns = Namespace(functions=CORE_LIBRARY)
calc = Calculator(ns).calculate
# Simple example
assert calc('1in + 8pt') == Number(1.11111111, "in")
# Division
ns.set_variable('$width', Number(1000, "px"))
ns.set_variable('$font-size', Number(12, "px"))
ns.set_variable('$line-height', Number(30, "px"))
assert calc('10px/8px') == String('10px / 8px') # plain CSS; no division
assert calc('$width/2') == Number(500, "px") # uses a variable; does division
assert calc('(500px/2)') == Number(250, "px") # uses parens; does division
assert calc('5px + 8px/2px') == Number(9, "px") # uses +; does division
# TODO: Ruby doesn't include these spaces
assert calc('#{$font-size}/#{$line-height}') == String('12px / 30px')
# uses #{}; does no division
# Color operations
ns.set_variable('$translucent-red', Color.from_rgb(1, 0, 0, 0.5))
ns.set_variable('$green', Color.from_name('lime'))
assert calc('#010203 + #040506') == Color.from_hex('#050709')
assert calc('#010203 * 2') == Color.from_hex('#020406')
assert calc('rgba(255, 0, 0, 0.75) + rgba(0, 255, 0, 0.75)') == Color.from_rgb(1, 1, 0, 0.75)
assert calc('opacify($translucent-red, 0.3)') == Color.from_rgb(1, 0, 0, 0.8)
assert calc('transparentize($translucent-red, 0.25)') == Color.from_rgb(1, 0, 0, 0.25)
assert calc("progid:DXImageTransform.Microsoft.gradient(enabled='false', startColorstr='#{ie-hex-str($green)}', endColorstr='#{ie-hex-str($translucent-red)}')"
) == String.unquoted("progid:DXImageTransform.Microsoft.gradient(enabled='false', startColorstr='#FF00FF00', endColorstr='#80FF0000')")
# String operations
ns.set_variable('$value', Null())
assert_strict_string_eq(calc('e + -resize'), String('e-resize', quotes=None))
assert_strict_string_eq(calc('"Foo " + Bar'), String('Foo Bar', quotes='"'))
assert_strict_string_eq(calc('sans- + "serif"'), String('sans-serif', quotes=None))
assert calc('3px + 4px auto') == List([Number(7, "px"), String('auto', quotes=None)])
assert_strict_string_eq(calc('"I ate #{5 + 10} pies!"'), String('I ate 15 pies!', quotes='"'))
assert_strict_string_eq(calc('"I ate #{$value} pies!"'), String('I ate pies!', quotes='"'))
# Operators: arithmetic (+ - * / %), unary (+ -), comparison (== != < > <= >=), boolean
# Types: numbers, colors, strings, booleans, lists
# Test them all!
def test_addition(calc):
assert calc('123 + 456') == Number(579)
assert calc('1px + 2px') == Number(3, "px")
assert calc('123 + abc') == String('123abc')
assert calc('abc + 123') == String('abc123')
assert calc('abc + def') == String('abcdef')
assert calc('abc + "def"') == String('abcdef')
ret = calc('"abc" + def')
assert ret == String('abcdef')
assert ret.quotes == '"'
ret = calc('"abc" + "def"')
assert ret == String('abcdef')
assert ret.quotes == '"'
assert calc('#010305 + #050301') == Color.from_hex('#060606')
assert calc('#ffffff + #ffffff') == Color.from_name('white')
def test_subtraction(calc):
assert calc('123 - 456') == Number(-333)
assert calc('456 - 123') == Number(333)
# TODO test that subtracting e.g. strings doesn't work
assert calc('#0f0f0f - #050505') == Color.from_hex('#0a0a0a')
def test_division(calc):
assert calc('(5px / 5px)') == Number(1)
assert calc('(1in / 6pt)') == Number(12)
def test_comparison_numeric(calc):
assert calc('123 < 456')
assert calc('123 <= 456')
assert calc('123 <= 123')
assert calc('456 > 123')
assert calc('456 >= 123')
assert calc('456 >= 456')
assert calc('123 == 123')
assert calc('123 != 456')
# Same tests, negated
assert not calc('123 > 456')
assert not calc('123 >= 456')
assert not calc('456 < 123')
assert not calc('456 <= 123')
assert not calc('123 != 123')
assert not calc('123 == 456')
def test_comparison_stringerific(calc):
assert calc('"abc" == "abc"')
assert calc('"abc" != "xyz"')
# Same tests, negated
assert not calc('"abc" != "abc"')
assert not calc('"abc" == "xyz"')
# Interaction with other types
assert calc('123 != "123"')
# Sass strings don't support ordering
for expression in (
'"abc" < "xyz"',
'"abc" <= "xyz"',
'"abc" <= "abc"',
'"xyz" > "abc"',
'"xyz" >= "abc"',
'"xyz" >= "xyz"',
'123 < "456"'):
with pytest.raises(TypeError):
calc(expression)
def test_comparison_null(calc):
assert calc('null == null')
assert calc('null != 0')
with pytest.raises(TypeError):
calc('null < null')
def test_parse(calc):
# Tests for some general parsing.
assert calc('foo !important bar') == List([
String('foo'), String('!important'), String('bar'),
])
def test_functions(calc):
ns = Namespace(functions=CORE_LIBRARY)
calc = Calculator(ns).calculate
assert calc('grayscale(red)') == Color((127.5, 127.5, 127.5, 1))
assert calc('grayscale(1)') == String('grayscale(1)', quotes=None) # Misusing css built-in functions (with scss counterpart)
assert calc('skew(1)') == String('skew(1)', quotes=None) # Missing css-only built-in functions
with pytest.raises(TypeError):
calc('unitless("X")') # Misusing non-css built-in scss funtions
# TODO write more! i'm lazy.
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