feat(variant.update): add sub module update to modify variant item …

…and property.

variant/_index.scss

@@ -1,2 +1,3 @@
+@forward 'update' as update-*;
 @forward 'variant.create.function';
 @forward 'variant.modify.function';

variant/update/_index.scss

@@ -0,0 +1,2 @@
+@forward 'update.item.function';
+@forward 'update.property.function';

variant/update/_update.item.function.scss

@@ -0,0 +1,48 @@
+// Sass.
+@use 'sass:list';
+@use 'sass:meta';
+
+// Modules.
+@use '../../class';
+@use '../../map';
+@use '../../values';
+
+// Status: DONE
+// The `update.item()` function.
+// @param `$item`
+// @param `$class`
+// @param `$property`
+// @param `$key`
+// @returns
+@function item($item, $class: null, $property: null, $key: base) {
+  $result: ();
+  @if type-of($item) == map {
+    @each $-class, $prop in $item {
+      $result: (
+        if(
+          meta.type-of($class) == map,
+          class.affix-add($-class, $class),
+          $-class
+        ): map.get($property, $key, $property) or $prop
+      );
+    }
+  } @else {
+    $class: if(
+      meta.type-of($class) == map,
+      class.affix-add($item, $class),
+      $class or $item
+    );
+    @if $property {
+      $result: (
+        $class: map.get($property, $key, $property)
+      );
+    } @else {
+      @return $class;
+    }
+  }
+  @return $result;
+}
+
+// Examples.
+// @debug modify((primary: primary light), (prefix: p, suffix: s));
+// @debug modify((primary: primary light), (prefix: spectre, suffix: end));

variant/update/_update.property.function.scss

@@ -0,0 +1,50 @@
+// Sass.
+@use 'sass:list';
+
+// Modules.
+@use '../../map';
+@use '../../values';
+
+// Status: TODO:
+// The `update.property()` function.
+// @param `$property`
+// @param `$modifier`
+// @param `$attribute`
+// @returns
+@function property($property, $modifier, $attribute: null) {
+  $property: if(
+    map.has-keys($modifier, (property, middle)),
+    map.get($modifier, (property, middle)),
+    $property
+  );
+  @if list.separator($property) == comma {
+    $i: 1;
+    @each $base in $property {
+      $property: list.set-nth(
+        $property,
+        $i,
+        values.join(
+          (separator: space),
+          map.get-any($modifier, (property, base), (property, name), null),
+          $base,
+          $attribute,
+          map.get-any($modifier, (property, attribute), (property, end), null),
+        )
+      );
+      $i: $i + 1;
+    }
+  } @else {
+    $property: values.join(
+      (separator: space),
+      map.get-any($modifier, (property, base), (property, name), null),
+      $property,
+      $attribute,
+      map.get-any($modifier, (property, attribute), (property, end), null),
+    );
+  }
+  @return $property;
+}
+
+// Examples.
+
+