Sam Potts
101 lines
2.6 KiB
SCSS
101 lines
2.6 KiB
SCSS
// Downloaded from https://github.com/malyw/css-vars (and modified)
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// global map to be filled via variables
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$css-vars: ();
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// the variable may be set to "true" anywhere in the code,
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// so native CSS custom properties will be used instead of the Sass global map
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$css-vars-use-native: false !default;
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///
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// Assigns a variable to the global map
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///
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@function css-var-assign($varName: null, $varValue: null) {
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@return map-merge(
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$css-vars,
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(
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$varName: $varValue,
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)
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);
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}
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///
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// Emulates var() CSS native function behavior
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//
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// $args[0] {String} "--" + variable name
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// [$args[1]] Optional default value if variable is not assigned yet
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//
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// E.G.:
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// color: var(--main-color);
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// background: var(--main-background, green);
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///
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@function var($args...) {
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// CHECK PARAMS
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@if (length($args) ==0) {
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@error 'Variable name is expected to be passed to the var() function';
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}
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@if (str-length(nth($args, 1)) < 2 or str-slice(nth($args, 1), 0, 2) != '--') {
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@error "Variable name is expected to start from '--'";
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}
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// PROCESS
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$var-name: nth($args, 1);
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$var-value: map-get($css-vars, $var-name);
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@if ($css-vars-use-native) {
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// CSS variables
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// Native CSS: don't process function in case of native
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@return unquote('var(' + $args + ')');
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} @else {
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@if ($var-value == null) {
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// variable is not provided so far
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@if (length($args) == 2) {
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$var-value: nth($args, 2);
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}
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}
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// Sass: return value from the map
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@return $var-value;
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}
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}
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///
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// SASS mixin to provide variables
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// E.G.:
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// @include css-vars((
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// --color: rebeccapurple,
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// --height: 68px,
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// --margin-top: calc(2vh + 20px)
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// ));
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///
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@mixin css-vars($var-map: null) {
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// CHECK PARAMS
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@if ($var-map == null) {
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@error 'Map of variables is expected, instead got: null';
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}
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@if (type_of($var-map) != map) {
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@error 'Map of variables is expected, instead got another type passed: #{type_of($var, ap)}';
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}
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// PROCESS
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@if ($css-vars-use-native) {
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// CSS variables
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// Native CSS: assign CSS custom properties to the global scope
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@at-root :root {
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@each $var-name, $var-value in $var-map {
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@if (type_of($var-value) == string) {
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#{$var-name}: $var-value; // to prevent quotes interpolation
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} @else {
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#{$var-name}: #{$var-value};
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}
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}
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}
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} @else {
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// Sass or debug
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// merge variables and values to the global map (provides no output)
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@each $var-name, $var-value in $var-map {
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$css-vars: css-var-assign($varName, $varValue) !global; // store in global variable
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}
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}
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}
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