-// Bootstrap functions

-//

-// Utility mixins and functions for evalutating source code across our variables, maps, and mixins.

-

-// Ascending

-// Used to evaluate Sass maps like our grid breakpoints.

-@mixin _assert-ascending($map, $map-name) {

- $prev-key: null;

- $prev-num: null;

- @each $key, $num in $map {

- @if $prev-num == null {

- // Do nothing

- } @else if not comparable($prev-num, $num) {

- @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}' !";

- } @else if $prev-num >= $num {

- @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}' !";

- }

- $prev-key: $key;

- $prev-num: $num;

- }

-}

-

-// Starts at zero

-// Another grid mixin that ensures the min-width of the lowest breakpoint starts at 0.

-@mixin _assert-starts-at-zero($map) {

- $values: map-values($map);

- $first-value: nth($values, 1);

- @if $first-value != 0 {

- @warn "First breakpoint in `$grid-breakpoints` must start at 0, but starts at #{$first-value}.";

- }

-}

-

-// Replace `$search` with `$replace` in `$string`

-// Used on our SVG icon backgrounds for custom forms.

-//

-// @author Hugo Giraudel

-// @param {String} $string - Initial string

-// @param {String} $search - Substring to replace

-// @param {String} $replace ('') - New value

-// @return {String} - Updated string

-@function str-replace($string, $search, $replace: "") {

- $index: str-index($string, $search);

-

- @if $index {

- @return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace);

- }

-

- @return $string;

-}

-

-// Color contrast

-@function color-yiq($color) {

- $r: red($color);

- $g: green($color);

- $b: blue($color);

-

- $yiq: (($r * 299) + ($g * 587) + ($b * 114)) / 1000;

-

- @if ($yiq >= $yiq-contrasted-threshold) {

- @return $yiq-text-dark;

- } @else {

- @return $yiq-text-light;

- }

-}

-

-// Retrieve color Sass maps

-@function color($key: "blue") {

- @return map-get($colors, $key);

-}

-

-@function theme-color($key: "primary") {

- @return map-get($theme-colors, $key);

-}

-

-@function gray($key: "100") {

- @return map-get($grays, $key);

-}

-

-// Request a theme color level

-@function theme-color-level($color-name: "primary", $level: 0) {

- $color: theme-color($color-name);

- $color-base: if($level > 0, #000, #fff);

- $level: abs($level);

-

- @return mix($color-base, $color, $level * $theme-color-interval);

-}