--- /dev/null
+/**
+ * @fileoverview Define the cursor which ignores specified tokens.
+ * @author Toru Nagashima
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const DecorativeCursor = require("./decorative-cursor");
+
+//------------------------------------------------------------------------------
+// Exports
+//------------------------------------------------------------------------------
+
+/**
+ * The decorative cursor which ignores specified tokens.
+ */
+module.exports = class FilterCursor extends DecorativeCursor {
+
+ /**
+ * Initializes this cursor.
+ * @param {Cursor} cursor The cursor to be decorated.
+ * @param {Function} predicate The predicate function to decide tokens this cursor iterates.
+ */
+ constructor(cursor, predicate) {
+ super(cursor);
+ this.predicate = predicate;
+ }
+
+ /** @inheritdoc */
+ moveNext() {
+ const predicate = this.predicate;
+
+ while (super.moveNext()) {
+ if (predicate(this.current)) {
+ return true;
+ }
+ }
+ return false;
+ }
+};