maint(lib dependshandler): Modernize code.

Author: thet

src/lib/dependshandler.js

@@ -11,48 +11,60 @@ function DependsHandler($el, expression) {
 
 DependsHandler.prototype = {
     _findInputs: function (name) {
-        var $input = this.$context.find(":input[name='" + name + "']");
-        if (!$input.length) $input = $("#" + name);
+        let $input = this.$context.find(":input[name='" + name + "']"); // TODO input outside form
+        if (!$input.length) {
+            $input = $("#" + name);
+        }
         return $input;
     },
 
     _getValue: function (name) {
-        var $input = this._findInputs(name);
-        if (!$input.length) return null;
-
-        if ($input.attr("type") === "radio" || $input.attr("type") === "checkbox")
+        const $input = this._findInputs(name);
+        if (!$input.length) {
+            return null;
+        }
+        if ($input.attr("type") === "radio" || $input.attr("type") === "checkbox") {
             return $input.filter(":checked").val() || null;
-        else return $input.val();
+        }
+        return $input.val();
     },
 
     getAllInputs: function () {
-        var todo = [this.ast],
-            $inputs = $(),
-            node;
+        const todo = [this.ast];
+        let $inputs = $();
+        let node;
 
         while (todo.length) {
             node = todo.shift();
-            if (node.input) $inputs = $inputs.add(this._findInputs(node.input));
-            if (node.children && node.children.length)
+            if (node.input) {
+                $inputs = $inputs.add(this._findInputs(node.input));
+            }
+            if (node.children && node.children.length) {
                 todo.push.apply(todo, node.children);
+            }
         }
         return $inputs;
     },
 
     _evaluate: function (node) {
-        var value = node.input ? this._getValue(node.input) : null,
-            i;
+        const value = node.input ? this._getValue(node.input) : null;
 
         switch (node.type) {
             case "NOT":
                 return !this._evaluate(node.children[0]);
             case "AND":
-                for (i = 0; i < node.children.length; i++)
-                    if (!this._evaluate(node.children[i])) return false;
+                for (const child of node.children) {
+                    if (!this._evaluate(child)) {
+                        return false;
+                    }
+                }
                 return true;
             case "OR":
-                for (i = 0; i < node.children.length; i++)
-                    if (this._evaluate(node.children[i])) return true;
+                for (const child of node.children) {
+                    if (this._evaluate(child)) {
+                        return true;
+                    }
+                }
                 return false;
             case "comparison":
                 switch (node.operator) {
@@ -69,10 +81,14 @@ DependsHandler.prototype = {
                     case ">=":
                         return value >= node.value;
                     case "~=":
-                        if (value === null) return false;
+                        if (value === null) {
+                            return false;
+                        }
                         return value.indexOf(node.value) != -1;
                     case "=~":
-                        if (value === null || !node.value) return false;
+                        if (value === null || !node.value) {
+                            return false;
+                        }
                         return node.value.indexOf(value) != -1;
                 }
                 break;