parjs/dist/internal/parsers/fail.js

Library for building parsers using combinators.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.fail = exports.nope = void 0;
/** @module parjs */
const utils_1 = require("../../utils");
const parser_1 = require("../parser");
const defaultFailure = {
    kind: "Hard",
    reason: "User initiated failure."
};
/**
 * Returns a parser that fails softly with a given reason.
 *
 * @param reason The reason for the failure.
 */
function nope(reason) {
    return fail({
        kind: "Soft",
        reason
    });
}
exports.nope = nope;
class Fail extends parser_1.ParjserBase {
    constructor(failure) {
        super();
        this.failure = failure;
        this.type = "fail";
        this.expecting = this.failure.reason;
    }
    _apply(ps) {
        ps.kind = this.failure.kind;
        ps.reason = this.expecting;
    }
}
/**
 * Returns a parser that will always fail with the given failure info.
 *
 * @param pFailure How the parser should fail.
 */
function fail(pFailure) {
    const failure = typeof pFailure === "string"
        ? { kind: "Hard", reason: pFailure }
        : (0, utils_1.defaults)(pFailure, defaultFailure);
    return new Fail(failure);
}
exports.fail = fail;
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