44 lines
1.2 KiB
JavaScript
44 lines
1.2 KiB
JavaScript
|
/**
|
||
|
|
* @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;
|
||
|
|
}
|
||
|
|
};
|