Add missing sass mixins

src/scss/abstracts/_functions.scss

@@ -3,3 +3,4 @@
 //
 
 @import "functions/asset-url";
+@import "functions/strings";

src/scss/abstracts/functions/_strings.scss

@@ -0,0 +1,32 @@
+//
+// String functions
+// --------------------------------------------------
+
+@use "sass:selector";
+
+@function str-replace($string, $token, $replace: "") {
+	$i: str-index($string, $token);
+
+	@while (str-index($string, $token) != null) {
+		$first-part: str-slice($string, 1, ($i - 1));
+		$last-part: str-slice($string, ($i + str-length($token)));
+		$string: str-slice($string, 1, ($i - 1)) + $replace + $last-part;
+
+		$i: str-index($string, $token);
+	}
+
+	@return $string;
+}
+
+@function str-parse($string, $token) {
+	$i: str-index($string, $token);
+
+	@if $i {
+		$first-part: str-slice($string, 1, ($i - 1));
+		$string: str-parse(str-slice($string, ($i + str-length($token))), $token);
+		@debug $first-part;
+		@return join(selector.simple-selectors($first-part), $string);
+	}
+
+	@return selector.simple-selectors($string);
+}