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/*
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 React from "react";
import * as i18nCore from "taler-wallet-core";
/**
* Convert template strings to a msgid
*/
function toI18nString(stringSeq: ReadonlyArray<string>): 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;
}
export const str = i18nCore.str;
export const internalSetStrings = i18nCore.internalSetStrings;
export const strings = i18nCore.strings;
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();
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;
}
function getTranslatedChildren(
translation: string,
children: React.ReactNode,
): React.ReactNode[] {
const tr = translation.split(/%(\d+)\$s/);
const childArray = React.Children.toArray(children);
// Merge consecutive string children.
const placeholderChildren = [];
for (let i = 0; i < childArray.length; i++) {
const x = childArray[i];
if (x === undefined) {
continue;
} else if (typeof x === "string") {
continue;
} else {
placeholderChildren.push(x);
}
}
const result = [];
for (let i = 0; i < tr.length; i++) {
if (i % 2 == 0) {
// Text
result.push(tr[i]);
} else {
const childIdx = Number.parseInt(tr[i]) - 1;
result.push(placeholderChildren[childIdx]);
}
}
return result;
}
/**
* 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 translation: string = i18nCore.jed.ngettext(s, s, 1);
const result = getTranslatedChildren(translation, this.props.children);
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 translation = i18nCore.jed.ngettext(s, s, 1);
const result = getTranslatedChildren(translation, this.props.children);
return <div>{result}</div>;
}
}
/**
* See [[TranslateSwitch]].
*/
export class TranslateSingular extends React.Component<
TranslationPluralProps,
void
> {
render(): JSX.Element {
const s = stringifyChildren(this.props.children);
const translation = i18nCore.jed.ngettext(s, s, this.props.target);
const result = getTranslatedChildren(translation, this.props.children);
return <div>{result}</div>;
}
}
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