mirror of https://github.com/twbs/bootstrap.git
87 lines
2.6 KiB
SCSS
87 lines
2.6 KiB
SCSS
// Bootstrap functions
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//
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// Utility mixins and functions for evalutating source code across our variables, maps, and mixins.
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// Ascending
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// Used to evaluate Sass maps like our grid breakpoints.
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@mixin _assert-ascending($map, $map-name) {
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$prev-key: null;
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$prev-num: null;
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@each $key, $num in $map {
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@if $prev-num == null {
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// Do nothing
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} @else if not comparable($prev-num, $num) {
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@warn "Potentially invalid value for #{$map-name}: This map must be in ascending order, but key '#{$key}' has value #{$num} whose unit makes it incomparable to #{$prev-num}, the value of the previous key '#{$prev-key}' !";
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} @else if $prev-num >= $num {
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@warn "Invalid value for #{$map-name}: This map must be in ascending order, but key '#{$key}' has value #{$num} which isn't greater than #{$prev-num}, the value of the previous key '#{$prev-key}' !";
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}
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$prev-key: $key;
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$prev-num: $num;
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}
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}
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// Starts at zero
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// Another grid mixin that ensures the min-width of the lowest breakpoint starts at 0.
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@mixin _assert-starts-at-zero($map) {
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$values: map-values($map);
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$first-value: nth($values, 1);
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@if $first-value != 0 {
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@warn "First breakpoint in `$grid-breakpoints` must start at 0, but starts at #{$first-value}.";
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}
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}
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// Replace `$search` with `$replace` in `$string`
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// Used on our SVG icon backgrounds for custom forms.
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//
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// @author Hugo Giraudel
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// @param {String} $string - Initial string
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// @param {String} $search - Substring to replace
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// @param {String} $replace ('') - New value
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// @return {String} - Updated string
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@function str-replace($string, $search, $replace: "") {
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$index: str-index($string, $search);
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@if $index {
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@return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace);
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}
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@return $string;
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}
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// Color contrast
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@function color-yiq($color) {
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$r: red($color);
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$g: green($color);
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$b: blue($color);
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$yiq: (($r * 299) + ($g * 587) + ($b * 114)) / 1000;
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@if ($yiq >= $yiq-contrasted-threshold) {
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@return $yiq-text-dark;
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} @else {
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@return $yiq-text-light;
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}
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}
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// Retrieve color Sass maps
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@function color($key: "blue") {
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@return map-get($colors, $key);
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}
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@function theme-color($key: "primary") {
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@return map-get($theme-colors, $key);
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}
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@function gray($key: "100") {
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@return map-get($grays, $key);
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}
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// Request a theme color level
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@function theme-color-level($color-name: "primary", $level: 0) {
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$color: theme-color($color-name);
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$color-base: if($level > 0, #000, #fff);
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$level: abs($level);
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@return mix($color-base, $color, $level * $theme-color-interval);
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}
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