1 files changed, 267 insertions, 0 deletions
diff --git a/src/webex/i18n.tsx b/src/webex/i18n.tsx
new file mode 100644
index 000000000..3923654e7
--- /dev/null
+++ b/src/webex/i18n.tsx
@@ -0,0 +1,267 @@
+/*
+ This file is part of TALER
+ (C) 2016 GNUnet e.V.
+
+ 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.
+
+ 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
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Translation helpers for React components and template literals.
+ */
+
+/**
+ * Imports.
+ */
+import {strings} from "../i18n/strings";
+
+// @ts-ignore: no type decl for this library
+import * as jedLib from "jed";
+
+import * as React from "react";
+
+
+const jed = setupJed();
+
+let enableTracing = false;
+
+
+/**
+ * Set up jed library for internationalization,
+ * based on browser language settings.
+ */
+function setupJed(): any {
+  let lang: string;
+  try {
+    lang = chrome.i18n.getUILanguage();
+    // Chrome gives e.g. "en-US", but Firefox gives us "en_US"
+    lang = lang.replace("_", "-");
+  } catch (e) {
+    lang = "en";
+    console.warn("i18n default language not available");
+  }
+
+  if (!strings[lang]) {
+    lang = "en-US";
+    console.log(`language ${lang} not found, defaulting to english`);
+  }
+  return new jedLib.Jed(strings[lang]);
+}
+
+
+/**
+ * Convert template strings to a msgid
+ */
+function toI18nString(stringSeq: ReadonlyArray<string>) {
+  let s = "";
+  for (let i = 0; i < stringSeq.length; i++) {
+    s += stringSeq[i];
+    if (i < stringSeq.length - 1) {
+      s += `%${i + 1}$s`;
+    }
+  }
+  return s;
+}
+
+
+/**
+ * Internationalize a string template with arbitrary serialized values.
+ */
+export function str(stringSeq: TemplateStringsArray, ...values: any[]) {
+  const s = toI18nString(stringSeq);
+  const tr = jed.translate(s).ifPlural(1, s).fetch(...values);
+  return tr;
+}
+
+
+interface TranslateSwitchProps {
+  target: number;
+}
+
+
+function stringifyChildren(children: any): string {
+  let n = 1;
+  const ss = React.Children.map(children, (c) => {
+    if (typeof c === "string") {
+      return c;
+    }
+    return `%${n++}$s`;
+  });
+  const s = ss.join("").replace(/ +/g, " ").trim();
+  enableTracing && console.log("translation lookup", JSON.stringify(s));
+  return s;
+}
+
+
+interface TranslateProps {
+  /**
+   * Component that the translated element should be wrapped in.
+   * Defaults to "div".
+   */
+  wrap?: any;
+
+  /**
+   * Props to give to the wrapped component.
+   */
+  wrapProps?: any;
+}
+
+
+/**
+ * Translate text node children of this component.
+ * If a child component might produce a text node, it must be wrapped
+ * in a another non-text element.
+ *
+ * Example:
+ * ```
+ * <Translate>
+ * Hello.  Your score is <span><PlayerScore player={player} /></span>
+ * </Translate>
+ * ```
+ */
+export class Translate extends React.Component<TranslateProps, {}> {
+  render(): JSX.Element {
+    const s = stringifyChildren(this.props.children);
+    const tr = jed.ngettext(s, s, 1).split(/%(\d+)\$s/).filter((e: any, i: number) => i % 2 === 0);
+    const childArray = React.Children.toArray(this.props.children!);
+    for (let i = 0; i < childArray.length - 1; ++i) {
+      if ((typeof childArray[i]) === "string" && (typeof childArray[i + 1]) === "string") {
+        childArray[i + 1] = (childArray[i] as string).concat(childArray[i + 1] as string);
+        childArray.splice(i, 1);
+      }
+    }
+    const result = [];
+    while (childArray.length > 0) {
+      const x = childArray.shift();
+      if (x === undefined) {
+        continue;
+      }
+      if (typeof x === "string") {
+        const t = tr.shift();
+        result.push(t);
+      } else {
+        result.push(x);
+      }
+    }
+    if (!this.props.wrap) {
+      return <div>{result}</div>;
+    }
+    return React.createElement(this.props.wrap, this.props.wrapProps, result);
+  }
+}
+
+
+/**
+ * Switch translation based on singular or plural based on the target prop.
+ * Should only contain TranslateSingular and TransplatePlural as children.
+ *
+ * Example:
+ * ```
+ * <TranslateSwitch target={n}>
+ *  <TranslateSingular>I have {n} apple.</TranslateSingular>
+ *  <TranslatePlural>I have {n} apples.</TranslatePlural>
+ * </TranslateSwitch>
+ * ```
+ */
+export class TranslateSwitch extends React.Component<TranslateSwitchProps, void> {
+  render(): JSX.Element {
+    let singular: React.ReactElement<TranslationPluralProps> | undefined;
+    let plural: React.ReactElement<TranslationPluralProps> | undefined;
+    const children = this.props.children;
+    if (children) {
+      React.Children.forEach(children, (child: any) => {
+        if (child.type === TranslatePlural) {
+          plural = child;
+        }
+        if (child.type === TranslateSingular) {
+          singular = child;
+        }
+      });
+    }
+    if ((!singular) || (!plural)) {
+      console.error("translation not found");
+      return React.createElement("span", {}, ["translation not found"]);
+    }
+    singular.props.target = this.props.target;
+    plural.props.target = this.props.target;
+    // We're looking up the translation based on the
+    // singular, even if we must use the plural form.
+    return singular;
+  }
+}
+
+
+interface TranslationPluralProps {
+  target: number;
+}
+
+/**
+ * See [[TranslateSwitch]].
+ */
+export class TranslatePlural extends React.Component<TranslationPluralProps, void> {
+  render(): JSX.Element {
+    const s = stringifyChildren(this.props.children);
+    const tr = jed.ngettext(s, s, 1).split(/%(\d+)\$s/).filter((e: any, i: number) => i % 2 === 0);
+    const childArray = React.Children.toArray(this.props.children!);
+    for (let i = 0; i < childArray.length - 1; ++i) {
+      if ((typeof childArray[i]) === "string" && (typeof childArray[i + 1]) === "string") {
+        childArray[i + i] = childArray[i] as string + childArray[i + 1] as string;
+        childArray.splice(i, 1);
+      }
+    }
+    const result = [];
+    while (childArray.length > 0) {
+      const x = childArray.shift();
+      if (x === undefined) {
+        continue;
+      }
+      if (typeof x === "string") {
+        const t = tr.shift();
+        result.push(t);
+      } else {
+        result.push(x);
+      }
+    }
+    return <div>{result}</div>;
+  }
+}
+
+
+/**
+ * See [[TranslateSwitch]].
+ */
+export class TranslateSingular extends React.Component<TranslationPluralProps, void> {
+  render(): JSX.Element {
+    const s = stringifyChildren(this.props.children);
+    const tr = jed.ngettext(s, s, 1).split(/%(\d+)\$s/).filter((e: any, i: number) => i % 2 === 0);
+    const childArray = React.Children.toArray(this.props.children!);
+    for (let i = 0; i < childArray.length - 1; ++i) {
+      if ((typeof childArray[i]) === "string" && (typeof childArray[i + 1]) === "string") {
+        childArray[i + i] = childArray[i] as string + childArray[i + 1] as string;
+        childArray.splice(i, 1);
+      }
+    }
+    const result = [];
+    while (childArray.length > 0) {
+      const x = childArray.shift();
+      if (x === undefined) {
+        continue;
+      }
+      if (typeof x === "string") {
+        const t = tr.shift();
+        result.push(t);
+      } else {
+        result.push(x);
+      }
+    }
+    return <div>{result}</div>;
+  }
+}