Merge branch 'master' into chrome-storage-sync

lib/renderer/extensions/i18n.js

@@ -0,0 +1,84 @@
+// 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')
+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 defaultLocale = metadata.default_locale || 'en'
+  const localesDirectory = path.join(metadata.srcDirectory, '_locales')
+  let messagesPath = path.join(localesDirectory, language, 'messages.json')
+  if (!fs.statSyncNoException(messagesPath)) {
+    messagesPath = path.join(localesDirectory, defaultLocale, 'messages.json')
+  }
+  return messagesPath
+}
+
+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)
+    }
+  }
+}