77 lines
2.5 KiB
JavaScript
77 lines
2.5 KiB
JavaScript
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/*
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* Copyright (C) 2020 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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class TemplateRendererFrameApi {
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constructor(templateRenderer) {
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this._templateRenderer = templateRenderer;
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this._windowMessageHandlers = new Map([
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['renderHandlebarsTemplate', {async: true, handler: this._onRenderHandlebarsTemplate.bind(this)}]
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]);
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}
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prepare() {
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window.addEventListener('message', this._onWindowMessage.bind(this), false);
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}
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_onWindowMessage(e) {
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const {source, data: {action, params, id}} = e;
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const messageHandler = this._windowMessageHandlers.get(action);
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if (typeof messageHandler === 'undefined') { return; }
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this._onWindowMessageInner(messageHandler, action, params, source, id);
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}
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async _onWindowMessageInner({handler, async}, action, params, source, id) {
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let response;
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try {
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let result = handler(params);
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if (async) {
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result = await result;
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}
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response = {result};
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} catch (error) {
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response = {error: this._errorToJson(error)};
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}
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if (typeof id === undefined) { return; }
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source.postMessage({action: `${action}.response`, params: response, id}, '*');
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}
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async _onRenderHandlebarsTemplate({template, data, marker}) {
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return await this._templateRenderer.render(template, data, marker);
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}
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_errorToJson(error) {
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try {
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if (error !== null && typeof error === 'object') {
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return {
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name: error.name,
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message: error.message,
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stack: error.stack,
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data: error.data
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};
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}
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} catch (e) {
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// NOP
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}
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return {
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value: error,
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hasValue: true
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};
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}
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}
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