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1 // Bootstrap functions
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2 //
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3 // Utility mixins and functions for evalutating source code across our variables, maps, and mixins.
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4
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5 // Ascending
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6 // Used to evaluate Sass maps like our grid breakpoints.
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7 @mixin _assert-ascending($map, $map-name) {
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8 $prev-key: null;
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9 $prev-num: null;
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10 @each $key, $num in $map {
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11 @if $prev-num == null {
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12 // Do nothing
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13 } @else if not comparable($prev-num, $num) {
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14 @warn "Potentially invalid value for #{$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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15 } @else if $prev-num >= $num {
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16 @warn "Invalid value for #{$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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17 }
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18 $prev-key: $key;
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19 $prev-num: $num;
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20 }
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21 }
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22
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23 // Starts at zero
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24 // Another grid mixin that ensures the min-width of the lowest breakpoint starts at 0.
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25 @mixin _assert-starts-at-zero($map) {
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26 $values: map-values($map);
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27 $first-value: nth($values, 1);
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28 @if $first-value != 0 {
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29 @warn "First breakpoint in `$grid-breakpoints` must start at 0, but starts at #{$first-value}.";
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30 }
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31 }
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32
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33 // Replace `$search` with `$replace` in `$string`
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34 // Used on our SVG icon backgrounds for custom forms.
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35 //
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36 // @author Hugo Giraudel
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37 // @param {String} $string - Initial string
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38 // @param {String} $search - Substring to replace
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39 // @param {String} $replace ('') - New value
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40 // @return {String} - Updated string
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41 @function str-replace($string, $search, $replace: "") {
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42 $index: str-index($string, $search);
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43
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44 @if $index {
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45 @return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace);
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46 }
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47
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48 @return $string;
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49 }
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50
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51 // Color contrast
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52 @mixin color-yiq($color) {
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53 $r: red($color);
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54 $g: green($color);
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55 $b: blue($color);
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56
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57 $yiq: (($r * 299) + ($g * 587) + ($b * 114)) / 1000;
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58
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59 @if ($yiq >= 150) {
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60 color: #111;
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61 } @else {
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62 color: #fff;
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63 }
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64 }
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65
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66 // Retreive color Sass maps
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67 @function color($key: "blue") {
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68 @return map-get($colors, $key);
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69 }
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70
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71 @function theme-color($key: "primary") {
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72 @return map-get($theme-colors, $key);
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73 }
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74
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75 @function grayscale($key: "100") {
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76 @return map-get($grays, $key);
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77 }
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78
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79 // Request a theme color level
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80 @function theme-color-level($color-name: "primary", $level: 0) {
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81 $color: theme-color($color-name);
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82 $color-base: if($level > 0, #000, #fff);
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83
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84 @if $level < 0 {
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85 // Lighter values need a quick double negative for the Sass math to work
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86 @return mix($color-base, $color, $level * -1 * $theme-color-interval);
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87 } @else {
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88 @return mix($color-base, $color, $level * $theme-color-interval);
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89 }
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90 }
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