// 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) == "%" {
    // 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, $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);

}