mirror of https://github.com/twbs/bootstrap.git
103 lines
3.2 KiB
SCSS
103 lines
3.2 KiB
SCSS
// Bootstrap functions
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//
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// Utility mixins and functions for evaluating 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 $prev-num == null or unit($num) == "%" or unit($prev-num) == "%" {
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// Do nothing
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} @else if not comparable($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: $num;
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}
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}
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// Starts at zero
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// Used to ensure the min-width of the lowest breakpoint starts at 0.
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@mixin _assert-starts-at-zero($map, $map-name: "$grid-breakpoints") {
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$values: map-values($map);
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$first-value: nth($values, 1);
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@if $first-value != 0 {
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@warn "First breakpoint in #{$map-name} must start at 0, but starts at #{$first-value}.";
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}
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}
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// Internal Bootstrap function to turn maps into its negative variant.
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// It prefixes the keys with `n` and makes the value negative.
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@function negativify-map($map) {
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$result: ();
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@each $key, $value in $map {
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@if $key != 0 {
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$result: map-merge($result, ("n" + $key: (-$value)));
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}
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}
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@return $result;
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}
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// Get multiple keys from a sass map
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@function map-get-multiple($map, $values) {
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$result: ();
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@each $key, $value in $map {
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@if (index($values, $key) != null) {
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$result: map-merge($result, ($key: $value));
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}
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}
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@return $result;
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}
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// Replace `$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 $string;
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}
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// See https://codepen.io/kevinweber/pen/dXWoRw
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@function escape-svg($string) {
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@if str-index($string, "data:image/svg+xml") {
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@each $char, $encoded in $escaped-characters {
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$string: str-replace($string, $char, $encoded);
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}
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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, $dark: $yiq-text-dark, $light: $yiq-text-light) {
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$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) + ($b * 114)) / 1000;
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@return if($yiq >= $yiq-contrasted-threshold, $dark, $light);
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}
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// Request a color level
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@function color-level($color: $primary, $level: 0) {
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$color-base: if($level > 0, $black, $white);
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$level: abs($level);
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@return mix($color-base, $color, $level * $theme-color-interval);
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}
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