parjs/internal/combinators/maybe.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 maybe(val = undefined) {
    return combinator_1.defineCombinator(inner => {
        return new class MaybeCombinator extends parser_1.ParjserBase {
            constructor() {
                super(...arguments);
                this._inner = inner;
                this.expecting = "expecting anything";
                this.type = "maybe";
            }
            _apply(ps) {
                inner.apply(ps);
                if (ps.isSoft) {
                    // on soft failure, set the value and result to OK
                    ps.value = val;
                    ps.kind = result_1.ResultKind.Ok;
                }
                // on ok/hard/fatal, propagate the result.
            }
        }();
    });
}
exports.maybe = maybe;

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