1 files changed, 83 insertions, 0 deletions
diff --git a/packages/website/ts/utils/translate.ts b/packages/website/ts/utils/translate.ts
new file mode 100644
index 000000000..5148e48ad
--- /dev/null
+++ b/packages/website/ts/utils/translate.ts
@@ -0,0 +1,83 @@
+import * as _ from 'lodash';
+import { Deco, Key, Language } from 'ts/types';
+
+import * as chinese from '../../translations/chinese.json';
+import * as english from '../../translations/english.json';
+import * as korean from '../../translations/korean.json';
+import * as russian from '../../translations/russian.json';
+import * as spanish from '../../translations/spanish.json';
+
+const languageToTranslations = {
+    [Language.English]: english,
+    [Language.Spanish]: spanish,
+    [Language.Chinese]: chinese,
+    [Language.Korean]: korean,
+    [Language.Russian]: russian,
+};
+
+const languagesWithoutCaps = [Language.Chinese, Language.Korean];
+
+interface Translation {
+    [key: string]: string;
+}
+
+export class Translate {
+    private _selectedLanguage: Language;
+    private _translation: Translation;
+    constructor(desiredLanguage?: Language) {
+        if (!_.isUndefined(desiredLanguage)) {
+            this.setLanguage(desiredLanguage);
+            return;
+        }
+        const browserLanguage = (window.navigator as any).userLanguage || window.navigator.language || 'en-US';
+        let language = Language.English;
+        if (_.includes(browserLanguage, 'es-')) {
+            language = Language.Spanish;
+        } else if (_.includes(browserLanguage, 'zh-')) {
+            language = Language.Chinese;
+        } else if (_.includes(browserLanguage, 'ko-')) {
+            language = Language.Korean;
+        } else if (_.includes(browserLanguage, 'ru-')) {
+            language = Language.Russian;
+        }
+        this.setLanguage(language);
+    }
+    public getLanguage() {
+        return this._selectedLanguage;
+    }
+    public setLanguage(language: Language) {
+        const isLanguageSupported = !_.isUndefined(languageToTranslations[language]);
+        if (!isLanguageSupported) {
+            throw new Error(`${language} not supported`);
+        }
+        this._selectedLanguage = language;
+        this._translation = languageToTranslations[language];
+    }
+    public get(key: Key, decoration?: Deco) {
+        let text = this._translation[key];
+        if (!_.isUndefined(decoration) && !_.includes(languagesWithoutCaps, this._selectedLanguage)) {
+            switch (decoration) {
+                case Deco.Cap:
+                    text = this._capitalize(text);
+                    break;
+
+                case Deco.Upper:
+                    text = text.toUpperCase();
+                    break;
+
+                case Deco.CapWords:
+                    const words = text.split(' ');
+                    const capitalizedWords = _.map(words, w => this._capitalize(w));
+                    text = capitalizedWords.join(' ');
+                    break;
+
+                default:
+                    throw new Error(`Unrecognized decoration: ${decoration}`);
+            }
+        }
+        return text;
+    }
+    private _capitalize(text: string) {
+        return `${text.charAt(0).toUpperCase()}${text.slice(1)}`;
+    }
+}