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import EventEmitter from 'node:events';
import {readFile} from 'node:fs/promises';
import path from 'node:path';
import chokidar from 'chokidar';
import he from 'he'; // It stands for "HTML Entities", apparently. Cursed.
import yaml from 'js-yaml';
import T from '#things';
import {colors, logWarn} from '#cli';
import {
annotateError,
annotateErrorWithFile,
showAggregate,
withAggregate,
} from '#sugar';
const {Language} = T;
export function processLanguageSpec(spec, {existingCode = null} = {}) {
const {
'meta.languageCode': code,
'meta.languageName': name,
'meta.languageIntlCode': intlCode = null,
'meta.hidden': hidden = false,
...strings
} = spec;
withAggregate({message: `Errors validating language spec`}, ({push}) => {
if (!code) {
push(new Error(`Missing language code`));
}
if (!name) {
push(new Error(`Missing language name`));
}
if (code && existingCode && code !== existingCode) {
push(new Error(`Language code (${code}) doesn't match previous value\n(You'll have to reload hsmusic to load this)`));
}
});
return {code, intlCode, name, hidden, strings};
}
function flattenLanguageSpec(spec) {
const recursive = (keyPath, value) =>
(typeof value === 'object'
? Object.assign({}, ...
Object.entries(value)
.map(([key, value]) =>
(key === '_'
? {[keyPath]: value}
: recursive(
(keyPath ? `${keyPath}.${key}` : key),
value))))
: {[keyPath]: value});
return recursive('', spec);
}
async function processLanguageSpecFromFile(file, processLanguageSpecOpts) {
let contents;
try {
contents = await readFile(file, 'utf-8');
} catch (caughtError) {
throw annotateError(
new Error(`Failed to read language file`, {cause: caughtError}),
error => annotateErrorWithFile(error, file));
}
let rawSpec;
let parseLanguage;
try {
if (path.extname(file) === '.yaml') {
parseLanguage = 'YAML';
rawSpec = yaml.load(contents);
} else {
parseLanguage = 'JSON';
rawSpec = JSON.parse(contents);
}
} catch (caughtError) {
throw annotateError(
new Error(`Failed to parse language file as valid ${parseLanguage}`, {cause: caughtError}),
error => annotateErrorWithFile(error, file));
}
const flattenedSpec = flattenLanguageSpec(rawSpec);
try {
return processLanguageSpec(flattenedSpec, processLanguageSpecOpts);
} catch (caughtError) {
throw annotateErrorWithFile(caughtError, file);
}
}
export function initializeLanguageObject() {
const language = new Language();
language.escapeHTML = string =>
he.encode(string, {useNamedReferences: true});
return language;
}
export async function processLanguageFile(file) {
const language = initializeLanguageObject();
const properties = await processLanguageSpecFromFile(file);
return Object.assign(language, properties);
}
export function watchLanguageFile(file, {
logging = true,
} = {}) {
const basename = path.basename(file);
const events = new EventEmitter();
const language = initializeLanguageObject();
let emittedReady = false;
let successfullyAppliedLanguage = false;
Object.assign(events, {language, close});
const watcher = chokidar.watch(file);
watcher.on('change', () => handleFileUpdated());
setImmediate(handleFileUpdated);
return events;
async function close() {
return watcher.close();
}
function checkReadyConditions() {
if (emittedReady) return;
if (!successfullyAppliedLanguage) return;
events.emit('ready');
emittedReady = true;
}
async function handleFileUpdated() {
let properties;
try {
properties = await processLanguageSpecFromFile(file, {
existingCode:
(successfullyAppliedLanguage
? language.code
: null),
});
} catch (error) {
events.emit('error', error);
if (logging) {
const label =
(successfullyAppliedLanguage
? `${language.name} (${language.code})`
: basename);
if (successfullyAppliedLanguage) {
logWarn`Failed to load language ${label} - using existing version`;
} else {
logWarn`Failed to load language ${label} - no prior version loaded`;
}
showAggregate(error, {showTraces: false});
}
return;
}
Object.assign(language, properties);
successfullyAppliedLanguage = true;
if (logging && emittedReady) {
const timestamp = new Date().toLocaleString('en-US', {timeStyle: 'medium'});
console.log(colors.green(`[${timestamp}] Updated language ${language.name} (${language.code})`));
}
events.emit('update');
checkReadyConditions();
}
}
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