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/*
* Copyright (C) 2023 Yomitan Authors
* Copyright (C) 2016-2022 Yomichan Authors
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
import {Handlebars} from '../../../lib/handlebars.js';
import {ExtensionError} from '../../core/extension-error.js';
export class TemplateRenderer {
constructor() {
/** @type {Map<string, import('handlebars').TemplateDelegate<import('anki-templates').NoteData>>} */
this._cache = new Map();
/** @type {number} */
this._cacheMaxSize = 5;
/** @type {Map<import('anki-templates').RenderMode, import('template-renderer').DataType>} */
this._dataTypes = new Map();
/** @type {?((noteData: import('anki-templates').NoteData) => import('template-renderer').SetupCallbackResult)} */
this._renderSetup = null;
/** @type {?((noteData: import('anki-templates').NoteData) => import('template-renderer').CleanupCallbackResult)} */
this._renderCleanup = null;
}
/**
* @param {import('template-renderer').HelperFunctionsDescriptor} helpers
*/
registerHelpers(helpers) {
for (const [name, helper] of helpers) {
this._registerHelper(name, helper);
}
}
/**
* @param {import('anki-templates').RenderMode} name
* @param {import('template-renderer').DataType} details
*/
registerDataType(name, {modifier, composeData}) {
this._dataTypes.set(name, {modifier, composeData});
}
/**
* @param {?((noteData: import('anki-templates').NoteData) => import('template-renderer').SetupCallbackResult)} setup
* @param {?((noteData: import('anki-templates').NoteData) => import('template-renderer').CleanupCallbackResult)} cleanup
*/
setRenderCallbacks(setup, cleanup) {
this._renderSetup = setup;
this._renderCleanup = cleanup;
}
/**
* @param {string} template
* @param {import('template-renderer').PartialOrCompositeRenderData} data
* @param {import('anki-templates').RenderMode} type
* @returns {import('template-renderer').RenderResult}
*/
render(template, data, type) {
const instance = this._getTemplateInstance(template);
const modifiedData = this._getModifiedData(data, void 0, type);
return this._renderTemplate(instance, modifiedData);
}
/**
* @param {import('template-renderer').RenderMultiItem[]} items
* @returns {import('core').Response<import('template-renderer').RenderResult>[]}
*/
renderMulti(items) {
/** @type {import('core').Response<import('template-renderer').RenderResult>[]} */
const results = [];
for (const {template, templateItems} of items) {
const instance = this._getTemplateInstance(template);
for (const {type, commonData, datas} of templateItems) {
for (const data of datas) {
let result;
try {
const data2 = this._getModifiedData(data, commonData, type);
const renderResult = this._renderTemplate(instance, data2);
result = {result: renderResult};
} catch (error) {
result = {error: ExtensionError.serialize(error)};
}
results.push(result);
}
}
}
return results;
}
/**
* @param {import('template-renderer').CompositeRenderData} data
* @param {import('anki-templates').RenderMode} type
* @returns {import('anki-templates').NoteData}
*/
getModifiedData(data, type) {
return this._getModifiedData(data, void 0, type);
}
// Private
/**
* @param {string} template
* @returns {import('handlebars').TemplateDelegate<import('anki-templates').NoteData>}
*/
_getTemplateInstance(template) {
const cache = this._cache;
let instance = cache.get(template);
if (typeof instance === 'undefined') {
this._updateCacheSize(this._cacheMaxSize - 1);
instance = /** @type {import('handlebars').TemplateDelegate<import('anki-templates').NoteData>} */ (Handlebars.compileAST(template));
cache.set(template, instance);
}
return instance;
}
/**
* @param {import('handlebars').TemplateDelegate<import('anki-templates').NoteData>} instance
* @param {import('anki-templates').NoteData} data
* @returns {import('template-renderer').RenderResult}
*/
_renderTemplate(instance, data) {
const renderSetup = this._renderSetup;
const renderCleanup = this._renderCleanup;
/** @type {string} */
let result;
/** @type {?import('template-renderer').SetupCallbackResult} */
let additions1;
/** @type {?import('template-renderer').CleanupCallbackResult} */
let additions2;
try {
additions1 = (typeof renderSetup === 'function' ? renderSetup(data) : null);
result = instance(data).trim();
} finally {
additions2 = (typeof renderCleanup === 'function' ? renderCleanup(data) : null);
}
return /** @type {import('template-renderer').RenderResult} */ (Object.assign({result}, additions1, additions2));
}
/**
* @param {import('template-renderer').PartialOrCompositeRenderData} data
* @param {import('anki-note-builder').CommonData|undefined} commonData
* @param {import('anki-templates').RenderMode} type
* @returns {import('anki-templates').NoteData}
* @throws {Error}
*/
_getModifiedData(data, commonData, type) {
if (typeof type === 'string') {
const typeInfo = this._dataTypes.get(type);
if (typeof typeInfo !== 'undefined') {
if (typeof commonData !== 'undefined') {
const {composeData} = typeInfo;
data = composeData(data, commonData);
} else if (typeof data.commonData === 'undefined') {
throw new Error('Incomplete data');
}
const {modifier} = typeInfo;
return modifier(/** @type {import('template-renderer').CompositeRenderData} */ (data));
}
}
throw new Error(`Invalid type: ${type}`);
}
/**
* @param {number} maxSize
*/
_updateCacheSize(maxSize) {
const cache = this._cache;
let removeCount = cache.size - maxSize;
if (removeCount <= 0) { return; }
for (const key of cache.keys()) {
cache.delete(key);
if (--removeCount <= 0) { break; }
}
}
/**
* @param {string} name
* @param {import('template-renderer').HelperFunction} helper
*/
_registerHelper(name, helper) {
/**
* @this {unknown}
* @param {unknown[]} args
* @returns {unknown}
*/
function wrapper(...args) {
const argCountM1 = Math.max(0, args.length - 1);
const options = /** @type {import('handlebars').HelperOptions} */ (args[argCountM1]);
args.length = argCountM1;
return helper(args, this, options);
}
Handlebars.registerHelper(name, wrapper);
}
}
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