parjs/internal/combinators/exactly.js

A parser-combinator library for JavaScript.

"use strict";
/**
 * @module parjs/combinators
 */
/** */
Object.defineProperty(exports, "__esModule", { value: true });
const result_1 = require("../result");
const combinator_1 = require("./combinator");
const parser_1 = require("../parser");
function exactly(count) {
    return combinator_1.defineCombinator(source => {
        return new class Exactly extends parser_1.ParjserBase {
            constructor() {
                super(...arguments);
                this.type = "exactly";
                this.expecting = source.expecting;
            }
            _apply(ps) {
                let arr = [];
                for (let i = 0; i < count; i++) {
                    source.apply(ps);
                    if (!ps.isOk) {
                        if (ps.kind === result_1.ResultKind.SoftFail && i > 0) {
                            ps.kind = result_1.ResultKind.HardFail;
                        }
                        // fail because the inner parser has failed.
                        return;
                    }
                    arr.push(ps.value);
                }
                ps.value = arr;
            }
        }();
    });
}
exports.exactly = exactly;

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