Update RFS to v8.1.0

diff --git a/scss/vendor/_rfs.scss b/scss/vendor/_rfs.scss
index 497e07eda913871b1d61e8488e70cf156d038ccf..e453f441ee5c04637dd0a5e7ba38112488d071f5 100644 (file)
--- a/scss/vendor/_rfs.scss
+++ b/scss/vendor/_rfs.scss
@@ -2,9 +2,9 @@
 
 // SCSS RFS mixin
 //
-// Automated font-resizing
+// Automated responsive font sizes
 //
-// See https://github.com/twbs/rfs
+// Licensed under MIT (https://github.com/twbs/rfs/blob/v8.x/LICENSE)
 
 // Configuration
 
@@ -12,11 +12,19 @@
 $rfs-base-font-size: 1.25rem !default;
 $rfs-font-size-unit: rem !default;
 
+@if $rfs-font-size-unit != rem and $rfs-font-size-unit != px {
+  @error "`#{$rfs-font-size-unit}` is not a valid unit for $rfs-font-size-unit. Use `px` or `rem`.";
+}
+
 // Breakpoint at where font-size starts decreasing if screen width is smaller
 $rfs-breakpoint: 1200px !default;
 $rfs-breakpoint-unit: px !default;
 
-// Resize font-size based on screen height and width
+@if $rfs-breakpoint-unit != px and $rfs-breakpoint-unit != em and $rfs-breakpoint-unit != rem {
+  @error "`#{$rfs-breakpoint-unit}` is not a valid unit for $rfs-breakpoint-unit. Use `px`, `em` or `rem`.";
+}
+
+// Resize font size based on screen height and width
 $rfs-two-dimensional: false !default;
 
 // Factor of decrease
@@ -41,12 +49,54 @@ $enable-responsive-font-sizes: true !default;
 // Cache $rfs-base-font-size unit
 $rfs-base-font-size-unit: unit($rfs-base-font-size);
 
+@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;
+}
+
 // Remove px-unit from $rfs-base-font-size for calculations
 @if $rfs-base-font-size-unit == "px" {
-  $rfs-base-font-size: $rfs-base-font-size / ($rfs-base-font-size * 0 + 1);
+  $rfs-base-font-size: divide($rfs-base-font-size, $rfs-base-font-size * 0 + 1);
 }
 @else if $rfs-base-font-size-unit == "rem" {
-  $rfs-base-font-size: $rfs-base-font-size / ($rfs-base-font-size * 0 + 1 / $rfs-rem-value);
+  $rfs-base-font-size: divide($rfs-base-font-size, divide($rfs-base-font-size * 0 + 1, $rfs-rem-value));
 }
 
 // Cache $rfs-breakpoint unit to prevent multiple calls
@@ -54,13 +104,55 @@ $rfs-breakpoint-unit-cache: unit($rfs-breakpoint);
 
 // Remove unit from $rfs-breakpoint for calculations
 @if $rfs-breakpoint-unit-cache == "px" {
-  $rfs-breakpoint: $rfs-breakpoint / ($rfs-breakpoint * 0 + 1);
+  $rfs-breakpoint: divide($rfs-breakpoint, $rfs-breakpoint * 0 + 1);
 }
 @else if $rfs-breakpoint-unit-cache == "rem" or $rfs-breakpoint-unit-cache == "em" {
-  $rfs-breakpoint: $rfs-breakpoint / ($rfs-breakpoint * 0 + 1 / $rfs-rem-value);
+  $rfs-breakpoint: divide($rfs-breakpoint, divide($rfs-breakpoint * 0 + 1, $rfs-rem-value));
+}
+
+// Internal mixin that adds disable classes to the selector if needed.
+@mixin _rfs-disable-class {
+  @if $rfs-class == "disable" {
+    // Adding an extra class increases specificity, which prevents the media query to override the font size
+    &,
+    .disable-responsive-font-size &,
+    &.disable-responsive-font-size {
+      @content;
+    }
+  }
+  @else {
+    @content;
+  }
+}
+
+// Internal mixin that adds enable classes to the selector if needed.
+@mixin _rfs-enable-class {
+  @if $rfs-class == "enable" {
+    .enable-responsive-font-size &,
+    &.enable-responsive-font-size {
+      @content;
+    }
+  }
+  @else {
+    @content;
+  }
 }
 
-// Responsive font-size mixin
+// Internal mixin used to determine which media query needs to be used
+@mixin _rfs-media-query($mq-value) {
+  @if $rfs-two-dimensional {
+    @media (max-width: #{$mq-value}), (max-height: #{$mq-value}) {
+      @content;
+    }
+  }
+  @else {
+    @media (max-width: #{$mq-value}) {
+      @content;
+    }
+  }
+}
+
+// Responsive font size mixin
 @mixin rfs($fs, $important: false) {
   // Cache $fs unit
   $fs-unit: if(type-of($fs) == "number", unit($fs), false);
@@ -73,128 +165,60 @@ $rfs-breakpoint-unit-cache: unit($rfs-breakpoint);
     font-size: #{$fs}#{$rfs-suffix};
   }
   @else {
-    // Variables for storing static and fluid rescaling
-    $rfs-static: null;
-    $rfs-fluid: null;
-
-    // Remove px-unit from $fs for calculations
+    // Remove unit from $fs for calculations
     @if $fs-unit == "px" {
-      $fs: $fs / ($fs * 0 + 1);
+      $fs: divide($fs, $fs * 0 + 1);
     }
     @else if $fs-unit == "rem" {
-      $fs: $fs / ($fs * 0 + 1 / $rfs-rem-value);
+      $fs: divide($fs, divide($fs * 0 + 1, $rfs-rem-value));
     }
 
-    // Set default font-size
-    @if $rfs-font-size-unit == rem {
-      $rfs-static: #{$fs / $rfs-rem-value}rem#{$rfs-suffix};
-    }
-    @else if $rfs-font-size-unit == px {
-      $rfs-static: #{$fs}px#{$rfs-suffix};
+    // Set default font size
+    $rfs-static: if($rfs-font-size-unit == rem, #{divide($fs, $rfs-rem-value)}rem, #{$fs}px);
+
+    // Only add the media query if the font size is bigger than the minimum font size
+    @if $fs <= $rfs-base-font-size or not $enable-responsive-font-sizes {
+      font-size: #{$rfs-static}#{$rfs-suffix};
     }
     @else {
-      @error "`#{$rfs-font-size-unit}` is not a valid unit for $rfs-font-size-unit. Use `px` or `rem`.";
-    }
-
-    // Only add media query if font-size is bigger as the minimum font-size
-    // If $rfs-factor == 1, no rescaling will take place
-    @if $fs > $rfs-base-font-size and $enable-responsive-font-sizes {
-      $min-width: null;
-      $variable-unit: null;
+      // Calculate the minimum font size for $fs
+      $fs-min: $rfs-base-font-size + divide($fs - $rfs-base-font-size, $rfs-factor);
 
-      // Calculate minimum font-size for given font-size
-      $fs-min: $rfs-base-font-size + ($fs - $rfs-base-font-size) / $rfs-factor;
-
-      // Calculate difference between given font-size and minimum font-size for given font-size
+      // Calculate difference between $fs and the minimum font size
       $fs-diff: $fs - $fs-min;
 
       // Base font-size formatting
-      // No need to check if the unit is valid, because we did that before
-      $min-width: if($rfs-font-size-unit == rem, #{$fs-min / $rfs-rem-value}rem, #{$fs-min}px);
+      $min-width: if($rfs-font-size-unit == rem, #{divide($fs-min, $rfs-rem-value)}rem, #{$fs-min}px);
 
-      // If two-dimensional, use smallest of screen width and height
+      // Use `vmin` if two-dimensional is enabled
       $variable-unit: if($rfs-two-dimensional, vmin, vw);
 
       // Calculate the variable width between 0 and $rfs-breakpoint
-      $variable-width: #{$fs-diff * 100 / $rfs-breakpoint}#{$variable-unit};
+      $variable-width: #{divide($fs-diff * 100, $rfs-breakpoint)}#{$variable-unit};
 
-      // Set the calculated font-size.
+      // Set the calculated font-size
       $rfs-fluid: calc(#{$min-width} + #{$variable-width}) #{$rfs-suffix};
-    }
 
-    // Rendering
-    @if $rfs-fluid == null {
-      // Only render static font-size if no fluid font-size is available
-      font-size: $rfs-static;
-    }
-    @else {
-      $mq-value: null;
+      // Breakpoint formatting
+      $mq-value: if($rfs-breakpoint-unit == px, #{$rfs-breakpoint}px, #{divide($rfs-breakpoint, $rfs-rem-value)}#{$rfs-breakpoint-unit});
 
-      // RFS breakpoint formatting
-      @if $rfs-breakpoint-unit == em or $rfs-breakpoint-unit == rem {
-        $mq-value: #{$rfs-breakpoint / $rfs-rem-value}#{$rfs-breakpoint-unit};
-      }
-      @else if $rfs-breakpoint-unit == px {
-        $mq-value: #{$rfs-breakpoint}px;
-      }
-      @else {
-        @error "`#{$rfs-breakpoint-unit}` is not a valid unit for $rfs-breakpoint-unit. Use `px`, `em` or `rem`.";
+      @include _rfs-disable-class {
+        font-size: #{$rfs-static}#{$rfs-suffix};
       }
 
-      @if $rfs-class == "disable" {
-        // Adding an extra class increases specificity,
-        // which prevents the media query to override the font size
-        &,
-        .disable-responsive-font-size &,
-        &.disable-responsive-font-size {
-          font-size: $rfs-static;
+      @include _rfs-media-query($mq-value) {
+        @include _rfs-enable-class {
+          font-size: $rfs-fluid;
         }
-      }
-      @else {
-        font-size: $rfs-static;
-      }
 
-      @if $rfs-two-dimensional {
-        @media (max-width: #{$mq-value}), (max-height: #{$mq-value}) {
-          @if $rfs-class == "enable" {
-            .enable-responsive-font-size &,
-            &.enable-responsive-font-size {
-              font-size: $rfs-fluid;
-            }
-          }
-          @else {
-            font-size: $rfs-fluid;
-          }
-
-          @if $rfs-safari-iframe-resize-bug-fix {
-            // stylelint-disable-next-line length-zero-no-unit
-            min-width: 0vw;
-          }
-        }
-      }
-      @else {
-        @media (max-width: #{$mq-value}) {
-          @if $rfs-class == "enable" {
-            .enable-responsive-font-size &,
-            &.enable-responsive-font-size {
-              font-size: $rfs-fluid;
-            }
-          }
-          @else {
-            font-size: $rfs-fluid;
-          }
-
-          @if $rfs-safari-iframe-resize-bug-fix {
-            // stylelint-disable-next-line length-zero-no-unit
-            min-width: 0vw;
-          }
-        }
+        // Include safari iframe resize fix if needed
+        min-width: if($rfs-safari-iframe-resize-bug-fix, (0 * 1vw), null);
       }
     }
   }
 }
 
-// The font-size & responsive-font-size mixin uses RFS to rescale font sizes
+// The font-size & responsive-font-size mixins use RFS to rescale the font size
 @mixin font-size($fs, $important: false) {
   @include rfs($fs, $important);
 }