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- /**
- * @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;
- }
- };
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