--- /dev/null
+@charset "UTF-8";
+
+/// Builds the `src` list for an `@font-face` declaration.
+///
+/// @link https://goo.gl/Ru1bKP
+///
+/// @argument {string} $font-family
+///
+/// @argument {string} $file-path
+///
+/// @argument {boolean} $asset-pipeline
+///
+/// @argument {list} $file-formats
+///
+/// @return {list}
+///
+/// @require {function} _contains
+///
+/// @access private
+
+@function _font-source-declaration(
+ $font-family,
+ $file-path,
+ $asset-pipeline,
+ $file-formats
+) {
+ $src: ();
+
+ $formats-map: (
+ eot: "#{$file-path}.eot?#iefix" format("embedded-opentype"),
+ woff2: "#{$file-path}.woff2" format("woff2"),
+ woff: "#{$file-path}.woff" format("woff"),
+ ttf: "#{$file-path}.ttf" format("truetype"),
+ svg: "#{$file-path}.svg##{$font-family}" format("svg"),
+ );
+
+ @each $key, $values in $formats-map {
+ @if _contains($file-formats, $key) {
+ $file-path: nth($values, 1);
+ $font-format: nth($values, 2);
+
+ @if $asset-pipeline == true {
+ $src: append($src, font-url($file-path) $font-format, comma);
+ } @else {
+ $src: append($src, url($file-path) $font-format, comma);
+ }
+ }
+ }
+
+ @return $src;
+}