303 lines
10 KiB
SCSS
303 lines
10 KiB
SCSS
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// 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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@if length($map) > 0 {
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$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 #{$first-value}.";
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}
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}
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}
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// Colors
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@function to-rgb($value) {
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@return red($value), green($value), blue($value);
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}
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// stylelint-disable scss/dollar-variable-pattern
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@function rgba-css-var($identifier, $target) {
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@if $identifier == "body" and $target == "bg" {
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@return rgba(var(--#{$variable-prefix}#{$identifier}-bg-rgb), var(--#{$variable-prefix}#{$target}-opacity));
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} @if $identifier == "body" and $target == "text" {
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@return rgba(var(--#{$variable-prefix}#{$identifier}-color-rgb), var(--#{$variable-prefix}#{$target}-opacity));
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} @else {
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@return rgba(var(--#{$variable-prefix}#{$identifier}-rgb), var(--#{$variable-prefix}#{$target}-opacity));
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}
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}
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@function map-loop($map, $func, $args...) {
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$_map: ();
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@each $key, $value in $map {
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// allow to pass the $key and $value of the map as an function argument
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$_args: ();
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@each $arg in $args {
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$_args: append($_args, if($arg == "$key", $key, if($arg == "$value", $value, $arg)));
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}
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$_map: map-merge($_map, ($key: call(get-function($func), $_args...)));
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}
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@return $_map;
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}
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// stylelint-enable scss/dollar-variable-pattern
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@function varify($list) {
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$result: null;
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@each $entry in $list {
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$result: append($result, var(--#{$variable-prefix}#{$entry}), space);
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}
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@return $result;
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}
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// Internal Bootstrap function to turn maps into its negative variant.
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// It prefixes the keys with `n` and makes the value negative.
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@function negativify-map($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 $result;
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}
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// Merge multiple maps
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@function map-merge-multiple($maps...) {
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$merged-maps: ();
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@each $map in $maps {
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$merged-maps: map-merge($merged-maps, $map);
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}
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@return $merged-maps;
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}
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// Replace `$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 $string;
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}
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// See https://codepen.io/kevinweber/pen/dXWoRw
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//
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// Requires the use of quotes around data URIs.
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@function escape-svg($string) {
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@if str-index($string, "data:image/svg+xml") {
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@each $char, $encoded in $escaped-characters {
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// Do not escape the url brackets
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@if str-index($string, "url(") == 1 {
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$string: url("#{str-replace(str-slice($string, 6, -3), $char, $encoded)}");
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} @else {
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$string: str-replace($string, $char, $encoded);
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}
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}
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}
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@return $string;
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}
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// Color contrast
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// See https://github.com/twbs/bootstrap/pull/30168
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// A list of pre-calculated numbers of pow(divide((divide($value, 255) + .055), 1.055), 2.4). (from 0 to 255)
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// stylelint-disable-next-line scss/dollar-variable-default, scss/dollar-variable-pattern
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$_luminance-list: .0008 .001 .0011 .0013 .0015 .0017 .002 .0022 .0025 .0027 .003 .0033 .0037 .004 .0044 .0048 .0052 .0056 .006 .0065 .007 .0075 .008 .0086 .0091 .0097 .0103 .011 .0116 .0123 .013 .0137 .0144 .0152 .016 .0168 .0176 .0185 .0194 .0203 .0212 .0222 .0232 .0242 .0252 .0262 .0273 .0284 .0296 .0307 .0319 .0331 .0343 .0356 .0369 .0382 .0395 .0409 .0423 .0437 .0452 .0467 .0482 .0497 .0513 .0529 .0545 .0561 .0578 .0595 .0612 .063 .0648 .0666 .0685 .0704 .0723 .0742 .0762 .0782 .0802 .0823 .0844 .0865 .0887 .0908 .0931 .0953 .0976 .0999 .1022 .1046 .107 .1095 .1119 .1144 .117 .1195 .1221 .1248 .1274 .1301 .1329 .1356 .1384 .1413 .1441 .147 .15 .1529 .1559 .159 .162 .1651 .1683 .1714 .1746 .1779 .1812 .1845 .1878 .1912 .1946 .1981 .2016 .2051 .2086 .2122 .2159 .2195 .2232 .227 .2307 .2346 .2384 .2423 .2462 .2502 .2542 .2582 .2623 .2664 .2705 .2747 .2789 .2831 .2874 .2918 .2961 .3005 .305 .3095 .314 .3185 .3231 .3278 .3325 .3372 .3419 .3467 .3515 .3564 .3613 .3663 .3712 .3763 .3813 .3864 .3916 .3968 .402 .4072 .4125 .4179 .4233 .4287 .4342 .4397 .4452 .4508 .4564 .4621 .4678 .4735 .4793 .4851 .491 .4969 .5029 .5089 .5149 .521 .5271 .5333 .5395 .5457 .552 .5583 .5647 .5711 .5776 .5841 .5906 .5972 .6038 .6105 .6172 .624 .6308 .6376 .6445 .6514 .6584 .6654 .6724 .6795 .6867 .6939 .7011 .7084 .7157 .7231 .7305 .7379 .7454 .7529 .7605 .7682 .7758 .7835 .7913 .7991 .807 .8148 .8228 .8308 .8388 .8469 .855 .8632 .8714 .8796 .8879 .8963 .9047 .9131 .9216 .9301 .9387 .9473 .956 .9647 .9734 .9823 .9911 1;
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@function color-contrast($background, $color-contrast-dark: $color-contrast-dark, $color-contrast-light: $color-contrast-light, $min-contrast-ratio: $min-contrast-ratio) {
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$foregrounds: $color-contrast-light, $color-contrast-dark, $white, $black;
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$max-ratio: 0;
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$max-ratio-color: null;
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@each $color in $foregrounds {
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$contrast-ratio: contrast-ratio($background, $color);
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@if $contrast-ratio > $min-contrast-ratio {
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@return $color;
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} @else if $contrast-ratio > $max-ratio {
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$max-ratio: $contrast-ratio;
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$max-ratio-color: $color;
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}
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}
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@warn "Found no color leading to #{$min-contrast-ratio}:1 contrast ratio against #{$background}...";
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@return $max-ratio-color;
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}
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@function contrast-ratio($background, $foreground: $color-contrast-light) {
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$l1: luminance($background);
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$l2: luminance(opaque($background, $foreground));
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@return if($l1 > $l2, divide($l1 + .05, $l2 + .05), divide($l2 + .05, $l1 + .05));
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}
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// Return WCAG2.0 relative luminance
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// See https://www.w3.org/WAI/GL/wiki/Relative_luminance
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// See https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
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@function luminance($color) {
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$rgb: (
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"r": red($color),
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"g": green($color),
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"b": blue($color)
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);
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@each $name, $value in $rgb {
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$value: if(divide($value, 255) < .03928, divide(divide($value, 255), 12.92), nth($_luminance-list, $value + 1));
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$rgb: map-merge($rgb, ($name: $value));
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}
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@return (map-get($rgb, "r") * .2126) + (map-get($rgb, "g") * .7152) + (map-get($rgb, "b") * .0722);
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}
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// Return opaque color
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// opaque(#fff, rgba(0, 0, 0, .5)) => #808080
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@function opaque($background, $foreground) {
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@return mix(rgba($foreground, 1), $background, opacity($foreground) * 100);
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}
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// scss-docs-start color-functions
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// Tint a color: mix a color with white
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@function tint-color($color, $weight) {
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@return mix(white, $color, $weight);
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}
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// Shade a color: mix a color with black
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@function shade-color($color, $weight) {
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@return mix(black, $color, $weight);
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}
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// Shade the color if the weight is positive, else tint it
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@function shift-color($color, $weight) {
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@return if($weight > 0, shade-color($color, $weight), tint-color($color, -$weight));
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}
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// scss-docs-end color-functions
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// Return valid calc
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@function add($value1, $value2, $return-calc: true) {
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@if $value1 == null {
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@return $value2;
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}
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@if $value2 == null {
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@return $value1;
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}
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@if type-of($value1) == number and type-of($value2) == number and comparable($value1, $value2) {
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@return $value1 + $value2;
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}
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@return if($return-calc == true, calc(#{$value1} + #{$value2}), $value1 + unquote(" + ") + $value2);
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}
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@function subtract($value1, $value2, $return-calc: true) {
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@if $value1 == null and $value2 == null {
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@return null;
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}
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@if $value1 == null {
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@return -$value2;
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}
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@if $value2 == null {
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@return $value1;
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}
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@if type-of($value1) == number and type-of($value2) == number and comparable($value1, $value2) {
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@return $value1 - $value2;
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}
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@if type-of($value2) != number {
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$value2: unquote("(") + $value2 + unquote(")");
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}
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@return if($return-calc == true, calc(#{$value1} - #{$value2}), $value1 + unquote(" - ") + $value2);
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}
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@function divide($dividend, $divisor, $precision: 10) {
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$sign: if($dividend > 0 and $divisor > 0 or $dividend < 0 and $divisor < 0, 1, -1);
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$dividend: abs($dividend);
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$divisor: abs($divisor);
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@if $dividend == 0 {
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@return 0;
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}
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@if $divisor == 0 {
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@error "Cannot divide by 0";
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}
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$remainder: $dividend;
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$result: 0;
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$factor: 10;
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@while ($remainder > 0 and $precision >= 0) {
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$quotient: 0;
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@while ($remainder >= $divisor) {
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$remainder: $remainder - $divisor;
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$quotient: $quotient + 1;
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}
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$result: $result * 10 + $quotient;
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$factor: $factor * .1;
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$remainder: $remainder * 10;
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$precision: $precision - 1;
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@if ($precision < 0 and $remainder >= $divisor * 5) {
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$result: $result + 1;
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}
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}
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$result: $result * $factor * $sign;
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$dividend-unit: unit($dividend);
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$divisor-unit: unit($divisor);
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$unit-map: (
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"px": 1px,
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"rem": 1rem,
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"em": 1em,
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"%": 1%
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);
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@if ($dividend-unit != $divisor-unit and map-has-key($unit-map, $dividend-unit)) {
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$result: $result * map-get($unit-map, $dividend-unit);
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}
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@return $result;
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}
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