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More work on variable usage

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This commit is contained in:
Sam Potts
2019-04-11 20:50:20 +10:00
parent 848e798809
commit 996075decc
13 changed files with 69 additions and 85 deletions
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97
src/sass/lib/css-vars.scss
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@ -1,6 +1,4 @@
// Downloaded from https://github.com/malyw/css-vars
//// VARIABLES ////
// Downloaded from https://github.com/malyw/css-vars (and modified)
// global map to be filled via variables
$css-vars: ();
@ -9,29 +7,16 @@ $css-vars: ();
// so native CSS custom properties will be used instead of the Sass global map
$css-vars-use-native: false !default;
// enables the output of debug messages
$css-vars-debug-log: false !default;
//// FUNCTIONS ////
///
// Assigns a variable to the global map
///
@function _cssVarAssign($varName: null, $varValue: null) {
// CHECK PARAMS
@if ($varName==null) {
@error 'Variable name is expected, instead got: null';
}
@if ($varValue==null) {
@error 'Variable value is expected, instead got: null';
}
// assign to the global map
@if ($css-vars-debug-log and map-get($css-vars, $varName)) {
@debug "'#{$varName}' variable is reassigned";
}
@return map-merge($css-vars, ($varName: $varValue));
@function css-var-assign($varName: null, $varValue: null) {
@return map-merge(
$css-vars,
(
$varName: $varValue,
)
);
}
///
@ -54,42 +39,28 @@ $css-vars-debug-log: false !default;
}
// PROCESS
$varName: nth($args, 1);
$varValue: map-get($css-vars, $varName);
@if ($css-vars-debug-log or not $css-vars-use-native) {
// Sass or debug
@if ($varValue==null) {
// variable is not provided so far
@if (length($args) ==2) {
// the default value is passed
@if ($css-vars-debug-log) {
@debug "Provided default value is used for the variable: '#{$varName}'";
}
$varValue: nth($args, 2);
} @else if ($css-vars-debug-log) {
@debug "Variable '#{$varName}' is not assigned";
@if (not $css-vars-use-native) {
@debug "The 'var(#{$varName}...)' usage will be skipped in the output CSS";
}
}
}
}
$var-name: nth($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(' + $args + ')');
} @else {
@if ($var-value == null) {
// variable is not provided so far
@if (length($args) == 2) {
$var-value: nth($args, 2);
}
}
// Sass: return value from the map
@return $varValue;
@return $var-value;
}
}
//// MIXIN ////
///
// CSS mixin to provide variables
// SASS mixin to provide variables
// E.G.:
// @include css-vars((
// --color: rebeccapurple,
@ -97,35 +68,33 @@ $css-vars-debug-log: false !default;
// --margin-top: calc(2vh + 20px)
// ));
///
@mixin css-vars($varMap: null) {
@mixin css-vars($var-map: null) {
// CHECK PARAMS
@if ($varMap==null) {
@if ($var-map == null) {
@error 'Map of variables is expected, instead got: null';
}
@if (type_of($varMap) !=map) {
@error 'Map of variables is expected, instead got another type passed: #{type_of($varMap)}';
@if (type_of($var-map) != map) {
@error 'Map of variables is expected, instead got another type passed: #{type_of($var, ap)}';
}
// PROCESS
@if ($css-vars-debug-log or not $css-vars-use-native) {
// Sass or debug
// merge variables and values to the global map (provides no output)
@each $varName, $varValue in $varMap {
$css-vars: _cssVarAssign($varName, $varValue) !global; // store in global variable
}
}
@if ($css-vars-use-native) {
// CSS variables
// Native CSS: assign CSS custom properties to the global scope
@at-root :root {
@each $varName, $varValue in $varMap {
@if (type_of($varValue) ==string) {
#{$varName}: $varValue; // to prevent quotes interpolation
@each $var-name, $var-value in $var-map {
@if (type_of($var-value) == string) {
#{$var-name}: $var-value; // to prevent quotes interpolation
} @else {
#{$varName}: #{$varValue};
#{$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
}
}
}