83 lines
2.4 KiB
JavaScript
83 lines
2.4 KiB
JavaScript
/* jslint node: true */
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'use strict';
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const { Errors } = require('./enig_error.js');
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// deps
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const fs = require('graceful-fs');
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const iconv = require('iconv-lite');
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const async = require('async');
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module.exports = class DescriptIonFile {
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constructor() {
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this.entries = new Map();
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}
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get(fileName) {
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return this.entries.get(fileName);
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}
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getDescription(fileName) {
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const entry = this.get(fileName);
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if (entry) {
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return entry.desc;
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}
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}
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static createFromFile(path, cb) {
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fs.readFile(path, (err, descData) => {
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if (err) {
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return cb(err);
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}
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const descIonFile = new DescriptIonFile();
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// DESCRIPT.ION entries are terminated with a CR and/or LF
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const lines = iconv.decode(descData, 'cp437').split(/\r?\n/g);
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async.each(
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lines,
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(entryData, nextLine) => {
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//
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// We allow quoted (long) filenames or non-quoted filenames.
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// FILENAME<SPC>DESC<0x04><program data><CR/LF>
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//
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const parts = entryData.match(
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/^(?:(?:"([^"]+)" )|(?:([^ ]+) ))([^\x04]+)\x04(.)[^\r\n]*$/
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); // eslint-disable-line no-control-regex
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if (!parts) {
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return nextLine(null);
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}
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const fileName = parts[1] || parts[2];
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//
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// Un-escape CR/LF's
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// - escapped \r and/or \n
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// - BBBS style @n - See https://www.bbbs.net/sysop.html
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//
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const desc = parts[3].replace(/\\r\\n|\\n|[^@]@n/g, '\r\n');
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descIonFile.entries.set(fileName, {
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desc: desc,
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programId: parts[4],
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programData: parts[5],
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});
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return nextLine(null);
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},
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() => {
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return cb(
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descIonFile.entries.size > 0
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? null
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: Errors.Invalid(
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'Invalid or unrecognized DESCRIPT.ION format'
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),
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descIonFile
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);
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}
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);
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});
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}
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};
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