parjs/internal/parsers/string-len.js

A parser-combinator library for JavaScript.

"use strict";
/**
 * @module parjs
 */
/** */
Object.defineProperty(exports, "__esModule", { value: true });
const result_1 = require("../result");
const parser_1 = require("../parser");
/**
 * Returns a parser that parses exactly `length` characters and yields the
 * text that was parsed.
 * @param length The number of characters to parse.
 */
function stringLen(length) {
    return new class StringLen extends parser_1.ParjserBase {
        constructor() {
            super(...arguments);
            this.type = "stringLen";
            this.expecting = `expecting ${length} characters`;
        }
        _apply(ps) {
            let { position, input } = ps;
            if (input.length < position + length) {
                ps.kind = result_1.ResultKind.SoftFail;
                return;
            }
            ps.position += length;
            ps.value = input.substr(position, length);
            ps.kind = result_1.ResultKind.Ok;
        }
    }();
}
exports.stringLen = stringLen;

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