first commit

liusuyi

2023-04-24 4737f1e038743ced243c9e52423404d9034d6107

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/**
 * @fileoverview Define the cursor which limits the number of tokens.
 * @author Toru Nagashima
 */
"use strict";
 
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
 
const DecorativeCursor = require("./decorative-cursor");
 
//------------------------------------------------------------------------------
// Exports
//------------------------------------------------------------------------------
 
/**
 * The decorative cursor which limits the number of tokens.
 */
module.exports = class LimitCursor extends DecorativeCursor {
 
    /**
     * Initializes this cursor.
     * @param {Cursor} cursor The cursor to be decorated.
     * @param {number} count The count of tokens this cursor iterates.
     */
    constructor(cursor, count) {
        super(cursor);
        this.count = count;
    }
 
    /** @inheritdoc */
    moveNext() {
        if (this.count > 0) {
            this.count -= 1;
            return super.moveNext();
        }
        return false;
    }
};