parjs/internal/parsers/string.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 will parse the string `str` and yield the text
 * that was parsed. If it can't, it will fail softly without consuming input.
 * @param str The string to parse.
 */
function string(str) {
    return new class ParseString extends parser_1.ParjserBase {
        constructor() {
            super(...arguments);
            this.expecting = `expecting '${str}'`;
            this.type = "string";
        }
        _apply(ps) {
            let { position, input } = ps;
            let i;
            if (position + str.length > input.length) {
                ps.kind = result_1.ResultKind.SoftFail;
                return;
            }
            // This should create a StringSlice object instead of actually
            // copying a whole string.
            let substr = input.slice(position, position + str.length);
            // Equality test is very very fast.
            if (substr !== str) {
                ps.kind = result_1.ResultKind.SoftFail;
                return;
            }
            ps.position += str.length;
            ps.value = str;
            ps.kind = result_1.ResultKind.Ok;
        }
    }();
}
exports.string = string;

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