"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class IdentifierGenerator {
    constructor() {
        // u 被框架占用了，不提供 u 开头的变量名
        this._chars = 'abcdefghijklmnopqrstvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        this._nextIds = [0];
    }
    next() {
        const r = [];
        for (const char of this._nextIds) {
            r.unshift(this._chars[char]);
        }
        this._increment();
        const id = r.join('');
        if (keywords.includes(id)) {
            return this.next();
        }
        return id;
    }
    _increment() {
        for (let i = 0; i < this._nextIds.length; i++) {
            const val = ++this._nextIds[i];
            if (val >= this._chars.length) {
                this._nextIds[i] = 0;
            }
            else {
                return;
            }
        }
        this._nextIds.push(0);
    }
    *[Symbol.iterator]() {
        while (true) {
            yield this.next();
        }
    }
}
exports.default = IdentifierGenerator;
const keywords = [
    'abstract',
    'arguments',
    'await',
    'boolean',
    'break',
    'byte',
    'case',
    'catch',
    'char',
    'class',
    'const',
    'continue',
    'debugger',
    'default',
    'delete',
    'do',
    'double',
    'else',
    'enum',
    'eval',
    'export',
    'extends',
    'false',
    'final',
    'finally',
    'float',
    'for',
    'function',
    'goto',
    'if',
    'implements',
    'import',
    'in',
    'instanceof',
    'int',
    'interface',
    'let',
    'long',
    'native',
    'new',
    'null',
    'package',
    'private',
    'protected',
    'public',
    'return',
    'short',
    'static',
    'super',
    'switch',
    'synchronized',
    'this',
    'throw',
    'throws',
    'transient',
    'true',
    'try',
    'typeof',
    'var',
    'void',
    'volatile',
    'while',
    'with',
    'yield',
];