parjs/dist/internal/combinators/must.js

Library for building parsers using combinators.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.must = void 0;
const combinated_1 = require("../combinated");
const wrap_implicit_1 = require("../wrap-implicit");
class Must extends combinated_1.Combinated {
    constructor(source, _predicate) {
        super(source);
        this._predicate = _predicate;
        this.type = "must";
        this.expecting = `internal parser ${this.source.type} yielding a result satisfying condition`;
    }
    _apply(ps) {
        this.source.apply(ps);
        if (!ps.isOk) {
            return;
        }
        const result = this._predicate(ps.value, ps.userState);
        if (result === true)
            return;
        ps.kind = result.kind || "Soft";
        ps.reason = result.reason || "failed to fulfill a predicate";
    }
}
/**
 * Applies the source parser and makes sure its result fulfills `predicate`.
 *
 * @param predicate The condition to check for.
 */
function must(predicate) {
    return source => new Must((0, wrap_implicit_1.wrapImplicit)(source), predicate);
}
exports.must = must;
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