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from scss.expression import Calculator
from scss.rule import Namespace
from scss.types import NumberValue
from scss.util import to_str
import pytest
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
ns = Namespace()
calc = lambda expr: Calculator(ns).evaluate_expression(expr).render()
# Simple example
assert calc('1in + 8pt') == '1.11111in'
# Division
ns.set_variable('$width', '1000px')
ns.set_variable('$font-size', '12px')
ns.set_variable('$line-height', '30px')
assert calc('10px/8px') == '10px / 8px' # plain CSS; no division
assert calc('$width/2') == '500px' # uses a variable; does division
assert calc('(500px/2)') == '250px' # uses parens; does division
assert calc('5px + 8px/2px') == '9px' # uses +; does division
assert calc('#{$font-size}/#{$line-height}') == '12px/30px'
# uses #{}; does no division
# Color operations
ns.set_variable('$translucent-red', 'rgba(255, 0, 0, 0.5)')
ns.set_variable('$green', '#00ff00')
assert calc('#010203 + #040506') == '#050709'
assert calc('#010203 * 2') == '#020406'
assert calc('rgba(255, 0, 0, 0.75) + rgba(0, 255, 0, 0.75)') == 'rgba(255, 255, 0, 0.75)'
assert calc('opacify($translucent-red, 0.3)') == 'rgba(255, 0, 0, 0.9)'
assert calc('transparentize($translucent-red, 0.25)') == 'rgba(255, 0, 0, 0.25)'
assert calc("progid:DXImageTransform.Microsoft.gradient(enabled='false', startColorstr='#{ie-hex-str($green)}', endColorstr='#{ie-hex-str($translucent-red)}')"
) == "progid:DXImageTransform.Microsoft.gradient(enabled='false', startColorstr=#FF00FF00, endColorstr=#80FF0000)"
# String operations
ns.set_variable('$value', 'null')
assert calc('e + -resize') == 'e-resize'
assert calc('"Foo " + Bar') == '"Foo Bar"'
assert calc('sans- + "serif"') == 'sans-serif'
assert calc('3px + 4px auto') == '7px auto'
assert calc('"I ate #{5 + 10} pies!"') == '"I ate 15 pies!"'
assert calc('"I ate #{$value} pies!"') == '"I ate pies!"'
# Operators: arithmetic (+ - * / %), unary (+ -), comparison (== != < > <= >=), boolean
# Types: numbers, colors, strings, booleans, lists
# Test them all!
def test_addition():
calc = lambda expr: to_str(Calculator(Namespace()).calculate(expr))
assert calc('123 + 456') == '579'
assert calc('1px + 2px') == '3px'
assert calc('123 + abc') == '123abc'
assert calc('abc + 123') == 'abc123'
assert calc('abc + def') == 'abcdef'
assert calc('abc + "def"') == 'abcdef'
assert calc('"abc" + def') == '"abcdef"'
assert calc('"abc" + "def"') == '"abcdef"'
assert calc('#010305 + #050301') == '#060606'
assert calc('#ffffff + #ffffff') == '#ffffff'
def test_subtraction():
calc = lambda expr: to_str(Calculator(Namespace()).calculate(expr))
assert calc('123 - 456') == '-333'
assert calc('456 - 123') == '333'
# TODO test that subtracting e.g. strings doesn't work
assert calc('#0f0f0f - #050505') == '#0a0a0a'
def test_division():
calc = Calculator(Namespace()).calculate
assert calc('(5px / 5px)') == NumberValue(1)
def test_comparison_numeric():
calc = Calculator(Namespace()).calculate
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 = Calculator(Namespace()).calculate
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 = Calculator(Namespace()).calculate
assert calc('null == null')
assert calc('null != 0')
with pytest.raises(TypeError):
calc('null < null')
# TODO write more! i'm lazy.
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