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