Replace Sass division with multiplication and custom divide() function

Fixes #34353

.

Co-Authored-By: Slaven Tomac <slaventomac@gmail.com>

scss/_card.scss

@@ -58,7 +58,7 @@
 }
 
 .card-subtitle {
-  margin-top: -$card-spacer-y / 2;
+  margin-top: -$card-spacer-y * .5;
   margin-bottom: 0;
 }
 
@@ -109,15 +109,15 @@
 //
 
 .card-header-tabs {
-  margin-right: -$card-spacer-x / 2;
+  margin-right: -$card-spacer-x * .5;
   margin-bottom: -$card-spacer-y;
-  margin-left: -$card-spacer-x / 2;
+  margin-left: -$card-spacer-x * .5;
   border-bottom: 0;
 }
 
 .card-header-pills {
-  margin-right: -$card-spacer-x / 2;
-  margin-left: -$card-spacer-x / 2;
+  margin-right: -$card-spacer-x * .5;
+  margin-left: -$card-spacer-x * .5;
 }
 
 // Card image

scss/_carousel.scss

@@ -189,9 +189,9 @@
 
 .carousel-caption {
   position: absolute;
-  right: (100% - $carousel-caption-width) / 2;
+  right: (100% - $carousel-caption-width) * .5;
   bottom: 20px;
-  left: (100% - $carousel-caption-width) / 2;
+  left: (100% - $carousel-caption-width) * .5;
   z-index: 10;
   padding-top: 20px;
   padding-bottom: 20px;

scss/_custom-forms.scss

@@ -26,7 +26,7 @@
   left: 0;
   z-index: -1; // Put the input behind the label so it doesn't overlay text
   width: $custom-control-indicator-size;
-  height: ($font-size-base * $line-height-base + $custom-control-indicator-size) / 2;
+  height: ($font-size-base * $line-height-base + $custom-control-indicator-size) * .5;
   opacity: 0;
 
   &:checked ~ .custom-control-label::before {
@@ -83,7 +83,7 @@
   // Background-color and (when enabled) gradient
   &::before {
     position: absolute;
-    top: ($font-size-base * $line-height-base - $custom-control-indicator-size) / 2;
+    top: ($font-size-base * $line-height-base - $custom-control-indicator-size) * .5;
     left: -($custom-control-gutter + $custom-control-indicator-size);
     display: block;
     width: $custom-control-indicator-size;
@@ -98,7 +98,7 @@
   // Foreground (icon)
   &::after {
     position: absolute;
-    top: ($font-size-base * $line-height-base - $custom-control-indicator-size) / 2;
+    top: ($font-size-base * $line-height-base - $custom-control-indicator-size) * .5;
     left: -($custom-control-gutter + $custom-control-indicator-size);
     display: block;
     width: $custom-control-indicator-size;
@@ -186,7 +186,7 @@
     }
 
     &::after {
-      top: add(($font-size-base * $line-height-base - $custom-control-indicator-size) / 2, $custom-control-indicator-border-width * 2);
+      top: add(($font-size-base * $line-height-base - $custom-control-indicator-size) * .5, $custom-control-indicator-border-width * 2);
       left: add(-($custom-switch-width + $custom-control-gutter), $custom-control-indicator-border-width * 2);
       width: $custom-switch-indicator-size;
       height: $custom-switch-indicator-size;
@@ -406,7 +406,7 @@
   &::-webkit-slider-thumb {
     width: $custom-range-thumb-width;
     height: $custom-range-thumb-height;
-    margin-top: ($custom-range-track-height - $custom-range-thumb-height) / 2; // Webkit specific
+    margin-top: ($custom-range-track-height - $custom-range-thumb-height) * .5; // Webkit specific
     @include gradient-bg($custom-range-thumb-bg);
     border: $custom-range-thumb-border;
     @include border-radius($custom-range-thumb-border-radius);
@@ -481,7 +481,7 @@
     cursor: $custom-range-track-cursor;
     background-color: transparent;
     border-color: transparent;
-    border-width: $custom-range-thumb-height / 2;
+    border-width: $custom-range-thumb-height * .5;
     @include box-shadow($custom-range-track-box-shadow);
   }
 

scss/_forms.scss

@@ -199,13 +199,13 @@ textarea.form-control {
 .form-row {
   display: flex;
   flex-wrap: wrap;
-  margin-right: -$form-grid-gutter-width / 2;
-  margin-left: -$form-grid-gutter-width / 2;
+  margin-right: -$form-grid-gutter-width * .5;
+  margin-left: -$form-grid-gutter-width * .5;
 
   > .col,
   > [class*="col-"] {
-    padding-right: $form-grid-gutter-width / 2;
-    padding-left: $form-grid-gutter-width / 2;
+    padding-right: $form-grid-gutter-width * .5;
+    padding-left: $form-grid-gutter-width * .5;
   }
 }
 

scss/_functions.scss

@@ -75,7 +75,7 @@
   $g: green($color);
   $b: blue($color);
 
-  $yiq: (($r * 299) + ($g * 587) + ($b * 114)) / 1000;
+  $yiq: (($r * 299) + ($g * 587) + ($b * 114)) * .001;
 
   @if ($yiq >= $yiq-contrasted-threshold) {
     @return $dark;
@@ -158,3 +158,45 @@
 
   @return if($return-calc == true, calc(#{$value1} - #{$value2}), $value1 + unquote(" - ") + $value2);
 }
+
+@function divide($dividend, $divisor, $precision: 10) {
+  $sign: if($dividend > 0 and $divisor > 0 or $dividend < 0 and $divisor < 0, 1, -1);
+  $dividend: abs($dividend);
+  $divisor: abs($divisor);
+  @if $dividend == 0 {
+    @return 0;
+  }
+  @if $divisor == 0 {
+    @error "Cannot divide by 0";
+  }
+  $remainder: $dividend;
+  $result: 0;
+  $factor: 10;
+  @while ($remainder > 0 and $precision >= 0) {
+    $quotient: 0;
+    @while ($remainder >= $divisor) {
+      $remainder: $remainder - $divisor;
+      $quotient: $quotient + 1;
+    }
+    $result: $result * 10 + $quotient;
+    $factor: $factor * .1;
+    $remainder: $remainder * 10;
+    $precision: $precision - 1;
+    @if ($precision < 0 and $remainder >= $divisor * 5) {
+      $result: $result + 1;
+    }
+  }
+  $result: $result * $factor * $sign;
+  $dividend-unit: unit($dividend);
+  $divisor-unit: unit($divisor);
+  $unit-map: (
+    "px": 1px,
+    "rem": 1rem,
+    "em": 1em,
+    "%": 1%
+  );
+  @if ($dividend-unit != $divisor-unit and map-has-key($unit-map, $dividend-unit)) {
+    $result: $result * map-get($unit-map, $dividend-unit);
+  }
+  @return $result;
+}

scss/_images.scss

@@ -32,7 +32,7 @@
 }
 
 .figure-img {
-  margin-bottom: $spacer / 2;
+  margin-bottom: $spacer * .5;
   line-height: 1;
 }
 

scss/_jumbotron.scss

 .jumbotron {
-  padding: $jumbotron-padding ($jumbotron-padding / 2);
+  padding: $jumbotron-padding ($jumbotron-padding * .5);
   margin-bottom: $jumbotron-padding;
   color: $jumbotron-color;
   background-color: $jumbotron-bg;

scss/_modal.scss

@@ -175,7 +175,7 @@
   flex-wrap: wrap;
   align-items: center; // vertically center
   justify-content: flex-end; // Right align buttons with flex property because text-align doesn't work on flex items
-  padding: $modal-inner-padding - $modal-footer-margin-between / 2;
+  padding: $modal-inner-padding - $modal-footer-margin-between * .5;
   border-top: $modal-footer-border-width solid $modal-footer-border-color;
   @include border-bottom-radius($modal-content-inner-border-radius);
 
@@ -183,7 +183,7 @@
   // This solution is far from ideal because of the universal selector usage,
   // but is needed to fix https://github.com/twbs/bootstrap/issues/24800
   > * {
-    margin: $modal-footer-margin-between / 2;
+    margin: $modal-footer-margin-between * .5;
   }
 }
 

scss/_popover.scss

@@ -43,13 +43,13 @@
 
     &::before {
       bottom: 0;
-      border-width: $popover-arrow-height ($popover-arrow-width / 2) 0;
+      border-width: $popover-arrow-height ($popover-arrow-width * .5) 0;
       border-top-color: $popover-arrow-outer-color;
     }
 
     &::after {
       bottom: $popover-border-width;
-      border-width: $popover-arrow-height ($popover-arrow-width / 2) 0;
+      border-width: $popover-arrow-height ($popover-arrow-width * .5) 0;
       border-top-color: $popover-arrow-color;
     }
   }
@@ -66,13 +66,13 @@
 
     &::before {
       left: 0;
-      border-width: ($popover-arrow-width / 2) $popover-arrow-height ($popover-arrow-width / 2) 0;
+      border-width: ($popover-arrow-width * .5) $popover-arrow-height ($popover-arrow-width * .5) 0;
       border-right-color: $popover-arrow-outer-color;
     }
 
     &::after {
       left: $popover-border-width;
-      border-width: ($popover-arrow-width / 2) $popover-arrow-height ($popover-arrow-width / 2) 0;
+      border-width: ($popover-arrow-width * .5) $popover-arrow-height ($popover-arrow-width * .5) 0;
       border-right-color: $popover-arrow-color;
     }
   }
@@ -86,13 +86,13 @@
 
     &::before {
       top: 0;
-      border-width: 0 ($popover-arrow-width / 2) $popover-arrow-height ($popover-arrow-width / 2);
+      border-width: 0 ($popover-arrow-width * .5) $popover-arrow-height ($popover-arrow-width * .5);
       border-bottom-color: $popover-arrow-outer-color;
     }
 
     &::after {
       top: $popover-border-width;
-      border-width: 0 ($popover-arrow-width / 2) $popover-arrow-height ($popover-arrow-width / 2);
+      border-width: 0 ($popover-arrow-width * .5) $popover-arrow-height ($popover-arrow-width * .5);
       border-bottom-color: $popover-arrow-color;
     }
   }
@@ -104,7 +104,7 @@
     left: 50%;
     display: block;
     width: $popover-arrow-width;
-    margin-left: -$popover-arrow-width / 2;
+    margin-left: -$popover-arrow-width * .5;
     content: "";
     border-bottom: $popover-border-width solid $popover-header-bg;
   }
@@ -121,13 +121,13 @@
 
     &::before {
       right: 0;
-      border-width: ($popover-arrow-width / 2) 0 ($popover-arrow-width / 2) $popover-arrow-height;
+      border-width: ($popover-arrow-width * .5) 0 ($popover-arrow-width * .5) $popover-arrow-height;
       border-left-color: $popover-arrow-outer-color;
     }
 
     &::after {
       right: $popover-border-width;
-      border-width: ($popover-arrow-width / 2) 0 ($popover-arrow-width / 2) $popover-arrow-height;
+      border-width: ($popover-arrow-width * .5) 0 ($popover-arrow-width * .5) $popover-arrow-height;
       border-left-color: $popover-arrow-color;
     }
   }

scss/_tooltip.scss

@@ -37,7 +37,7 @@
 
     &::before {
       top: 0;
-      border-width: $tooltip-arrow-height ($tooltip-arrow-width / 2) 0;
+      border-width: $tooltip-arrow-height ($tooltip-arrow-width * .5) 0;
       border-top-color: $tooltip-arrow-color;
     }
   }
@@ -53,7 +53,7 @@
 
     &::before {
       right: 0;
-      border-width: ($tooltip-arrow-width / 2) $tooltip-arrow-height ($tooltip-arrow-width / 2) 0;
+      border-width: ($tooltip-arrow-width * .5) $tooltip-arrow-height ($tooltip-arrow-width * .5) 0;
       border-right-color: $tooltip-arrow-color;
     }
   }
@@ -67,7 +67,7 @@
 
     &::before {
       bottom: 0;
-      border-width: 0 ($tooltip-arrow-width / 2) $tooltip-arrow-height;
+      border-width: 0 ($tooltip-arrow-width * .5) $tooltip-arrow-height;
       border-bottom-color: $tooltip-arrow-color;
     }
   }
@@ -83,7 +83,7 @@
 
     &::before {
       left: 0;
-      border-width: ($tooltip-arrow-width / 2) 0 ($tooltip-arrow-width / 2) $tooltip-arrow-height;
+      border-width: ($tooltip-arrow-width * .5) 0 ($tooltip-arrow-width * .5) $tooltip-arrow-height;
       border-left-color: $tooltip-arrow-color;
     }
   }

scss/_variables.scss

@@ -299,7 +299,7 @@ $h4-font-size:                $font-size-base * 1.5 !default;
 $h5-font-size:                $font-size-base * 1.25 !default;
 $h6-font-size:                $font-size-base !default;
 
-$headings-margin-bottom:      $spacer / 2 !default;
+$headings-margin-bottom:      $spacer * .5 !default;
 $headings-font-family:        null !default;
 $headings-font-weight:        500 !default;
 $headings-line-height:        1.2 !default;
@@ -495,7 +495,7 @@ $input-height-border:                   $input-border-width * 2 !default;
 
 $input-height-inner:                    add($input-line-height * 1em, $input-padding-y * 2) !default;
 $input-height-inner-half:               add($input-line-height * .5em, $input-padding-y) !default;
-$input-height-inner-quarter:            add($input-line-height * .25em, $input-padding-y / 2) !default;
+$input-height-inner-quarter:            add($input-line-height * .25em, $input-padding-y * .5) !default;
 
 $input-height:                          add($input-line-height * 1em, add($input-padding-y * 2, $input-height-border, false)) !default;
 $input-height-sm:                       add($input-line-height-sm * 1em, add($input-padding-y-sm * 2, $input-height-border, false)) !default;
@@ -565,7 +565,7 @@ $custom-radio-indicator-border-radius:          50% !default;
 $custom-radio-indicator-icon-checked:           url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='-4 -4 8 8'><circle r='3' fill='#{$custom-control-indicator-checked-color}'/></svg>") !default;
 
 $custom-switch-width:                           $custom-control-indicator-size * 1.75 !default;
-$custom-switch-indicator-border-radius:         $custom-control-indicator-size / 2 !default;
+$custom-switch-indicator-border-radius:         $custom-control-indicator-size * .5 !default;
 $custom-switch-indicator-size:                  subtract($custom-control-indicator-size, $custom-control-indicator-border-width * 4) !default;
 
 $custom-select-padding-y:           $input-padding-y !default;
@@ -710,12 +710,12 @@ $nav-pills-link-active-color:       $component-active-color !default;
 $nav-pills-link-active-bg:          $component-active-bg !default;
 
 $nav-divider-color:                 $gray-200 !default;
-$nav-divider-margin-y:              $spacer / 2 !default;
+$nav-divider-margin-y:              $spacer * .5 !default;
 
 
 // Navbar
 
-$navbar-padding-y:                  $spacer / 2 !default;
+$navbar-padding-y:                  $spacer * .5 !default;
 $navbar-padding-x:                  $spacer !default;
 
 $navbar-nav-link-padding-x:         .5rem !default;
@@ -724,7 +724,7 @@ $navbar-brand-font-size:            $font-size-lg !default;
 // Compute the navbar-brand padding-y so the navbar-brand will have the same height as navbar-text and nav-link
 $nav-link-height:                   $font-size-base * $line-height-base + $nav-link-padding-y * 2 !default;
 $navbar-brand-height:               $navbar-brand-font-size * $line-height-base !default;
-$navbar-brand-padding-y:            ($nav-link-height - $navbar-brand-height) / 2 !default;
+$navbar-brand-padding-y:            ($nav-link-height - $navbar-brand-height) * .5 !default;
 
 $navbar-toggler-padding-y:          .25rem !default;
 $navbar-toggler-padding-x:          .75rem !default;
@@ -845,7 +845,7 @@ $card-bg:                           $white !default;
 
 $card-img-overlay-padding:          1.25rem !default;
 
-$card-group-margin:                 $grid-gutter-width / 2 !default;
+$card-group-margin:                 $grid-gutter-width * .5 !default;
 $card-deck-margin:                  $card-group-margin !default;
 
 $card-columns-count:                3 !default;

scss/mixins/_forms.scss

@@ -69,7 +69,7 @@
     // Align tooltip to form elements
     .form-row > .col > &,
     .form-row > [class*="col-"] > & {
-      left: $form-grid-gutter-width / 2;
+      left: $form-grid-gutter-width * .5;
     }
   }
 

scss/mixins/_grid-framework.scss

@@ -8,8 +8,8 @@
   %grid-column {
     position: relative;
     width: 100%;
-    padding-right: $gutter / 2;
-    padding-left: $gutter / 2;
+    padding-right: $gutter * .5;
+    padding-left: $gutter * .5;
   }
 
   @each $breakpoint in map-keys($breakpoints) {

scss/mixins/_grid.scss

@@ -4,8 +4,8 @@
 
 @mixin make-container($gutter: $grid-gutter-width) {
   width: 100%;
-  padding-right: $gutter / 2;
-  padding-left: $gutter / 2;
+  padding-right: $gutter * .5;
+  padding-left: $gutter * .5;
   margin-right: auto;
   margin-left: auto;
 }
@@ -13,8 +13,8 @@
 @mixin make-row($gutter: $grid-gutter-width) {
   display: flex;
   flex-wrap: wrap;
-  margin-right: -$gutter / 2;
-  margin-left: -$gutter / 2;
+  margin-right: -$gutter * .5;
+  margin-left: -$gutter * .5;
 }
 
 // For each breakpoint, define the maximum width of the container in a media query
@@ -33,16 +33,16 @@
   // always setting `width: 100%;`. This works because we use `flex` values
   // later on to override this initial width.
   width: 100%;
-  padding-right: $gutter / 2;
-  padding-left: $gutter / 2;
+  padding-right: $gutter * .5;
+  padding-left: $gutter * .5;
 }
 
 @mixin make-col($size, $columns: $grid-columns) {
-  flex: 0 0 percentage($size / $columns);
+  flex: 0 0 percentage(divide($size, $columns));
   // Add a `max-width` to ensure content within each column does not blow out
   // the width of the column. Applies to IE10+ and Firefox. Chrome and Safari
   // do not appear to require this.
-  max-width: percentage($size / $columns);
+  max-width: percentage(divide($size, $columns));
 }
 
 @mixin make-col-auto() {
@@ -52,7 +52,7 @@
 }
 
 @mixin make-col-offset($size, $columns: $grid-columns) {
-  $num: $size / $columns;
+  $num: divide($size, $columns);
   margin-left: if($num == 0, 0, percentage($num));
 }
 
@@ -63,7 +63,7 @@
 // style grid.
 @mixin row-cols($count) {
   > * {
-    flex: 0 0 100% / $count;
-    max-width: 100% / $count;
+    flex: 0 0 divide(100%, $count);
+    max-width: divide(100%, $count);
   }
 }

scss/utilities/_embed.scss

@@ -33,7 +33,7 @@
 
   .embed-responsive-#{$embed-responsive-aspect-ratio-x}by#{$embed-responsive-aspect-ratio-y} {
     &::before {
-      padding-top: percentage($embed-responsive-aspect-ratio-y / $embed-responsive-aspect-ratio-x);
+      padding-top: percentage(divide($embed-responsive-aspect-ratio-y, $embed-responsive-aspect-ratio-x));
     }
   }
 }

site/assets/scss/_component-examples.scss

@@ -88,7 +88,7 @@
 .bd-example {
   position: relative;
   padding: 1rem;
-  margin: 1rem (-$grid-gutter-width / 2) 0;
+  margin: 1rem (-$grid-gutter-width * .5) 0;
   border: solid $gray-100;
   border-width: .2rem 0 0;
   @include clearfix();
@@ -350,8 +350,8 @@
 }
 
 .bd-content .highlight {
-  margin-right: (-$grid-gutter-width / 2);
-  margin-left: (-$grid-gutter-width / 2);
+  margin-right: (-$grid-gutter-width * .5);
+  margin-left: (-$grid-gutter-width * .5);
 
   @include media-breakpoint-up(sm) {
     margin-right: 0;

site/assets/scss/_masthead.scss

@@ -2,7 +2,7 @@
 
 .bd-masthead {
   position: relative;
-  padding: 3rem ($grid-gutter-width / 2);
+  padding: 3rem ($grid-gutter-width * .5);
   background: linear-gradient(to right bottom, lighten($bd-purple-light, 16%) 50%, #fff 50%);
 
   h1 {

site/assets/scss/_skippy.scss

@@ -11,8 +11,8 @@
     position: static !important;
     width: auto !important;
     height: auto !important;
-    padding: $spacer / 2 !important;
-    margin: $spacer / 4 !important;
+    padding: $spacer * .5 !important;
+    margin: $spacer * .25 !important;
     overflow: visible !important;
     clip: auto !important;
     white-space: normal !important;