Jesus sucks

backend/frontend/node_modules/postcss-values-parser/old-lib/container.js

@@ -0,0 +1,48 @@
+const Node = require('./node');
+
+class Container extends Node {
+  walk(callback) {
+    return this.each((child, i) => {
+      let result = callback(child, i);
+      if (result !== false && child.walk) {
+        result = child.walk(callback);
+      }
+      return result;
+    });
+  }
+
+  walkType(type, callback) {
+    if (!type || !callback) {
+      throw new Error('Parameters {type} and {callback} are required.');
+    }
+
+    // allow users to pass a constructor, or node type string; eg. Word.
+    const isTypeCallable = typeof type === 'function';
+
+    return this.walk((node, index) => {
+      if ((isTypeCallable && node instanceof type) || (!isTypeCallable && node.type === type)) {
+        return callback.call(this, node, index);
+      }
+    });
+  }
+}
+
+Container.registerWalker = (constructor) => {
+  let walkerName = `walk${constructor.name}`;
+
+  // plural sugar
+  if (walkerName.lastIndexOf('s') !== walkerName.length - 1) {
+    walkerName += 's';
+  }
+
+  if (Container.prototype[walkerName]) {
+    return;
+  }
+
+  // we need access to `this` so we can't use an arrow function
+  Container.prototype[walkerName] = function(callback) {
+    return this.walkType(constructor, callback);
+  };
+};
+
+module.exports = Container;