parjs/dist/internal/combinators/maybe.js

Library for building parsers using combinators.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.maybe = void 0;
const combinated_1 = require("../combinated");
const result_1 = require("../result");
const wrap_implicit_1 = require("../wrap-implicit");
class MaybeCombinator extends combinated_1.Combinated {
    constructor(source, _val) {
        super(source);
        this._val = _val;
        this.type = "maybe";
        this.expecting = "expecting anything";
    }
    _apply(ps) {
        this.source.apply(ps);
        if (ps.isSoft) {
            // on soft failure, set the value and result to OK
            ps.value = this._val;
            ps.kind = result_1.ResultKind.Ok;
        }
        // on ok/hard/fatal, propagate the result.
    }
}
/**
 * Applies the source parser. If it fails softly, succeeds and yields `val`.
 *
 * @param val
 */
function maybe(val) {
    return source => new MaybeCombinator((0, wrap_implicit_1.wrapImplicit)(source), val);
}
exports.maybe = maybe;
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