1 files changed, 43 insertions, 0 deletions
diff --git a/ui/create-i18n.js b/ui/create-i18n.js
new file mode 100644
index 000000000..c80f5351a
--- /dev/null
+++ b/ui/create-i18n.js
@@ -0,0 +1,43 @@
+// cross-browser connection to extension i18n API
+const extension = require('extensionizer')
+const log = require('loglevel')
+
+
+class Translator {
+
+  async setLocale(localeName) {
+    this.localeName = localeName
+    this.locale = await fetchLocale(localeName)
+  }
+
+  getMessage (key, substitutions) {
+    // check locale is loaded
+    if (!this.locale) {
+      throw new Error('Translator - has not loaded a locale yet')
+    }
+    // check entry is present
+    const entry = this.locale[key]
+    if (!entry) {
+      log.error(`Translator - Unable to find value for "${key}"`)
+      throw new Error(`Translator - Unable to find value for "${key}"`)
+    }
+    let phrase = entry.message
+    // perform substitutions
+    if (substitutions && substitutions.length) {
+      phrase = phrase.replace(/\$1/g, substitutions[0])
+      if (substitutions.length > 1) {
+        phrase = phrase.replace(/\$2/g, substitutions[1])
+      }
+    }
+    return phrase
+  }
+
+}
+
+async function fetchLocale (localeName) {
+  const response = await fetch(`/_locales/${localeName}/messages.json`)
+  const locale = await response.json()
+  return locale
+}
+
+module.exports = Translator