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// Bootstrap functions
//
// Utility mixins and functions for evaluating 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 $prev-num == null or unit($num) == "%" or unit($prev-num) == "%" {
// Do nothing
} @else if not comparable($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: $num;
}
}
// Starts at zero
// Used to ensure the min-width of the lowest breakpoint starts at 0.
@mixin _assert-starts-at-zero($map, $map-name: "$grid-breakpoints") {
@if length($map) > 0 {
$values: map-values($map);
$first-value: nth($values, 1);
@if $first-value != 0 {
@warn "First breakpoint in #{$map-name} 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 $string;
}
// See https://codepen.io/kevinweber/pen/dXWoRw
@function escape-svg($string) {
@if str-index($string, "data:image/svg+xml") {
@each $char, $encoded in $escaped-characters {
// Do not escape the url brackets
@if str-index($string, "url(") == 1 {
$string: url("#{str-replace(str-slice($string, 6, -3), $char, $encoded)}");
} @else {
$string: str-replace($string, $char, $encoded);
}
}
}
@return $string;
}
// Color contrast
@function color-yiq($color, $dark: $yiq-text-dark, $light: $yiq-text-light) {
$r: red($color);
$g: green($color);
$b: blue($color);
$yiq: (($r * 299) + ($g * 587) + ($b * 114)) / 1000;
@if ($yiq >= $yiq-contrasted-threshold) {
@return $dark;
} @else {
@return $light;
}
}
// Retrieve color Sass maps
@function color($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, $black, $white);
$level: abs($level);
@return mix($color-base, $color, $level * $theme-color-interval);
}
// Return valid calc
@function add($value1, $value2, $return-calc: true) {
@if $value1 == null {
@return $value2;
}
@if $value2 == null {
@return $value1;
}
@if type-of($value1) == number and type-of($value2) == number and comparable($value1, $value2) {
@return $value1 + $value2;
}
@return if($return-calc == true, calc(#{$value1} + #{$value2}), $value1 + unquote(" + ") + $value2);
}
@function subtract($value1, $value2, $return-calc: true) {
@if $value1 == null and $value2 == null {
@return null;
}
@if $value1 == null {
@return -$value2;
}
@if $value2 == null {
@return $value1;
}
@if type-of($value1) == number and type-of($value2) == number and comparable($value1, $value2) {
@return $value1 - $value2;
}
@return if($return-calc == true, calc(#{$value1} - #{$value2}), $value1 + unquote(" - ") + $value2);
}
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