asarfuckery/electronasar/ptb/renderer/extensions/i18n.js

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2019-01-17 18:22:05 +00:00
'use strict'
// Implementation of chrome.i18n.getMessage
// https://developer.chrome.com/extensions/i18n#method-getMessage
//
// Does not implement predefined messages:
// https://developer.chrome.com/extensions/i18n#overview-predefined
const ipcRenderer = require('@electron/internal/renderer/ipc-renderer-internal')
const fs = require('fs')
const path = require('path')
let metadata
const getExtensionMetadata = (extensionId) => {
if (!metadata) {
metadata = ipcRenderer.sendSync('CHROME_I18N_MANIFEST', extensionId)
}
return metadata
}
const getMessagesPath = (extensionId, language) => {
const metadata = getExtensionMetadata(extensionId)
const localesDirectory = path.join(metadata.srcDirectory, '_locales')
try {
const filename = path.join(localesDirectory, language, 'messages.json')
fs.accessSync(filename, fs.constants.R_OK)
return filename
} catch (err) {
const defaultLocale = metadata.default_locale || 'en'
return path.join(localesDirectory, defaultLocale, 'messages.json')
}
}
const getMessages = (extensionId, language) => {
try {
const messagesPath = getMessagesPath(extensionId, language)
return JSON.parse(fs.readFileSync(messagesPath)) || {}
} catch (error) {
return {}
}
}
const getLanguage = () => {
return navigator.language.replace(/-.*$/, '').toLowerCase()
}
const replaceNumberedSubstitutions = (message, substitutions) => {
return message.replace(/\$(\d+)/, (_, number) => {
const index = parseInt(number, 10) - 1
return substitutions[index] || ''
})
}
const replacePlaceholders = (message, placeholders, substitutions) => {
if (typeof substitutions === 'string') {
substitutions = [substitutions]
}
if (!Array.isArray(substitutions)) {
substitutions = []
}
if (placeholders) {
Object.keys(placeholders).forEach((name) => {
let { content } = placeholders[name]
content = replaceNumberedSubstitutions(content, substitutions)
message = message.replace(new RegExp(`\\$${name}\\$`, 'gi'), content)
})
}
return replaceNumberedSubstitutions(message, substitutions)
}
const getMessage = (extensionId, messageName, substitutions) => {
const messages = getMessages(extensionId, getLanguage())
if (messages.hasOwnProperty(messageName)) {
const { message, placeholders } = messages[messageName]
return replacePlaceholders(message, placeholders, substitutions)
}
}
exports.setup = (extensionId) => {
return {
getMessage (messageName, substitutions) {
return getMessage(extensionId, messageName, substitutions)
}
}
}