move translation context to commons

2 files changed, 90 insertions, 0 deletions

diff --git a/packages/web-util/src/context/index.ts b/packages/web-util/src/context/index.ts
new file mode 100644
index 000000000..0ac2c752a
--- /dev/null
+++ b/packages/web-util/src/context/index.ts
@@ -0,0 +1,2 @@
+
+export { InternationalizationAPI, TranslationProvider, useTranslationContext } from "./translation.js";
diff --git a/packages/web-util/src/context/translation.ts b/packages/web-util/src/context/translation.ts
new file mode 100644
index 000000000..ce140ec42
--- /dev/null
+++ b/packages/web-util/src/context/translation.ts
@@ -0,0 +1,88 @@
+/*
+ This file is part of GNU Taler
+ (C) 2022 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import { i18n, setupI18n } from "@gnu-taler/taler-util";
+import { ComponentChildren, createContext, h, VNode } from "preact";
+import { useContext, useEffect } from "preact/hooks";
+import { useLang } from "../hooks/index.js";
+
+export type InternationalizationAPI = typeof i18n
+
+interface Type {
+  lang: string;
+  supportedLang: { [id in keyof typeof supportedLang]: string };
+  changeLanguage: (l: string) => void;
+  i18n: InternationalizationAPI;
+  isSaved: boolean;
+}
+
+const supportedLang = {
+  es: "Espanol [es]",
+  en: "English [en]",
+  fr: "Francais [fr]",
+  de: "Deutsch [de]",
+  sv: "Svenska [sv]",
+  it: "Italiane [it]",
+  navigator: "Defined by navigator",
+};
+
+const initial = {
+  lang: "en",
+  supportedLang,
+  changeLanguage: () => {
+    // do not change anything
+  },
+  i18n,
+  isSaved: false,
+};
+const Context = createContext<Type>(initial);
+
+interface Props {
+  initial?: string;
+  children: ComponentChildren;
+  forceLang?: string;
+  source: Record<string, any>
+}
+
+// Outmost UI wrapper.
+export const TranslationProvider = ({
+  initial,
+  children,
+  forceLang,
+  source
+}: Props): VNode => {
+  const [lang, changeLanguage, isSaved] = useLang(initial);
+  useEffect(() => {
+    if (forceLang) {
+      changeLanguage(forceLang);
+    }
+  });
+  useEffect(() => {
+    setupI18n(lang, source);
+  }, [lang]);
+  if (forceLang) {
+    setupI18n(forceLang, source);
+  } else {
+    setupI18n(lang, source);
+  }
+
+  return h(Context.Provider, {
+    value: { lang, changeLanguage, supportedLang, i18n, isSaved },
+    children,
+  });
+};
+
+export const useTranslationContext = (): Type => useContext(Context);