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October 12, 2020 10:34
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BEM mixins in Sass 3.4
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$elementSeparator: '__'; | |
$modifierSeparator: '--'; | |
@function containsModifier($selector) { | |
$selector: selectorToString($selector); | |
@if str-index($selector, $modifierSeparator) { | |
@return true; | |
} @else { | |
@return false; | |
} | |
} | |
@function selectorToString($selector) { | |
$selector: inspect($selector); //cast to string | |
$selector: str-slice($selector, 2, -2); //remove brackets | |
@return $selector; | |
} | |
@function getBlock($selector) { | |
$selector: selectorToString($selector); | |
$modifierStart: str-index($selector, $modifierSeparator) - 1; | |
@return str-slice($selector, 0, $modifierStart); | |
} | |
@mixin b($block) { | |
.#{$block} { | |
@content; | |
} | |
} | |
@mixin e($element) { | |
$selector: &; | |
@if containsModifier($selector) { | |
$block: getBlock($selector); | |
@at-root { | |
#{$selector} { | |
#{$block+$elementSeparator+$element} { | |
@content; | |
} | |
} | |
} | |
} @else { | |
@at-root { | |
#{$selector+$elementSeparator+$element} { | |
@content; | |
} | |
} | |
} | |
} | |
@mixin m($modifier) { | |
@at-root { | |
#{&}#{$modifierSeparator+$modifier} { | |
@content; | |
} | |
} | |
} | |
@include b(test) { | |
background: red; | |
@include e(element){ | |
font-size: 14px; | |
@include m(big) { | |
font-size: 18px; | |
} | |
}; | |
@include m(modifier) { | |
color: blue; | |
@include e(subelement) { | |
background: gray; | |
} | |
} | |
} |
Hi @johngerome,
thanks for your comment! That happens if you don't run a last test... it failed because I moved the call of getBlock() out of @if containsModifier($selector)
.
It's working now and I also prepared a Sassmeister gist: http://sassmeister.com/gist/6dac17c87fcf2d1555c4
http://sassmeister.com/gist/6dac17c87fcf2d1555c4 is not working
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Hi Mintel,
I tried it on sassmeister and i got an error
in line 21 it's Invalid null operation: "null minus 1"
str-index($selector, $modifierSeparator) is null