enigma-bbs/core/descript_ion_file.js

/* jslint node: true */
'use strict';

//	deps
const fs			= require('graceful-fs');
const iconv			= require('iconv-lite');
const async			= require('async');

module.exports = class DescriptIonFile {
    constructor() {
        this.entries = new Map();
    }

    get(fileName) {
        return this.entries.get(fileName);
    }

    getDescription(fileName) {
        const entry = this.get(fileName);
        if(entry) {
            return entry.desc;
        }
    }

    static createFromFile(path, cb) {
        fs.readFile(path, (err, descData) => {
            if(err) {
                return cb(err);
            }

            const descIonFile = new DescriptIonFile();

            //	DESCRIPT.ION entries are terminated with a CR and/or LF
            const lines = iconv.decode(descData, 'cp437').split(/\r?\n/g);

            async.each(lines, (entryData, nextLine) => {
                //
                //	We allow quoted (long) filenames or non-quoted filenames.
                //	FILENAME<SPC>DESC<0x04><program data><CR/LF>
                //
                const parts = entryData.match(/^(?:(?:"([^"]+)" )|(?:([^ ]+) ))([^\x04]+)\x04(.)[^\r\n]*$/);	//	eslint-disable-line no-control-regex
                if(!parts) {
                    return nextLine(null);
                }

                const fileName	= parts[1] || parts[2];

                //
                //	Un-escape CR/LF's
                //	- escapped \r and/or \n
                //	- BBBS style @n - See https://www.bbbs.net/sysop.html
                //
                const desc		= parts[3].replace(/\\r\\n|\\n|[^@]@n/g, '\r\n');

                descIonFile.entries.set(
                    fileName,
                    {
                        desc		: desc,
                        programId	: parts[4],
                        programData	: parts[5],
                    }
                );

                return nextLine(null);
            },
            () => {
                return cb(null, descIonFile);
            });
        });
    }
};