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