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+/*
+ * Copyright (C) 2016-2020 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/>.
+ */
+
+/* global
+ * Handlebars
+ * jp
+ */
+
+class TemplateRenderer {
+ constructor() {
+ this._cache = new Map();
+ this._cacheMaxSize = 5;
+ this._helpersRegistered = false;
+ }
+
+ async render(template, data) {
+ if (!this._helpersRegistered) {
+ this._registerHelpers();
+ this._helpersRegistered = true;
+ }
+
+ const cache = this._cache;
+ let instance = cache.get(template);
+ if (typeof instance === 'undefined') {
+ this._updateCacheSize(this._cacheMaxSize - 1);
+ instance = Handlebars.compile(template);
+ cache.set(template, instance);
+ }
+
+ return instance(data).trim();
+ }
+
+ // Private
+
+ _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; }
+ }
+ }
+
+ _registerHelpers() {
+ Handlebars.partials = Handlebars.templates;
+
+ const helpers = [
+ ['dumpObject', this._dumpObject.bind(this)],
+ ['furigana', this._furigana.bind(this)],
+ ['furiganaPlain', this._furiganaPlain.bind(this)],
+ ['kanjiLinks', this._kanjiLinks.bind(this)],
+ ['multiLine', this._multiLine.bind(this)],
+ ['sanitizeCssClass', this._sanitizeCssClass.bind(this)],
+ ['regexReplace', this._regexReplace.bind(this)],
+ ['regexMatch', this._regexMatch.bind(this)],
+ ['mergeTags', this._mergeTags.bind(this)]
+ ];
+
+ for (const [name, helper] of helpers) {
+ Handlebars.registerHelper(name, helper);
+ }
+ }
+
+ _escape(text) {
+ return Handlebars.Utils.escapeExpression(text);
+ }
+
+ _dumpObject(options) {
+ const dump = JSON.stringify(options.fn(this), null, 4);
+ return this._escape(dump);
+ }
+
+ _furigana(options) {
+ const definition = options.fn(this);
+ const segs = jp.distributeFurigana(definition.expression, definition.reading);
+
+ let result = '';
+ for (const seg of segs) {
+ if (seg.furigana) {
+ result += `<ruby>${seg.text}<rt>${seg.furigana}</rt></ruby>`;
+ } else {
+ result += seg.text;
+ }
+ }
+
+ return result;
+ }
+
+ _furiganaPlain(options) {
+ const definition = options.fn(this);
+ const segs = jp.distributeFurigana(definition.expression, definition.reading);
+
+ let result = '';
+ for (const seg of segs) {
+ if (seg.furigana) {
+ result += ` ${seg.text}[${seg.furigana}]`;
+ } else {
+ result += seg.text;
+ }
+ }
+
+ return result.trimLeft();
+ }
+
+ _kanjiLinks(options) {
+ let result = '';
+ for (const c of options.fn(this)) {
+ if (jp.isCodePointKanji(c.codePointAt(0))) {
+ result += `<a href="#" class="kanji-link">${c}</a>`;
+ } else {
+ result += c;
+ }
+ }
+
+ return result;
+ }
+
+ _multiLine(options) {
+ return options.fn(this).split('\n').join('<br>');
+ }
+
+ _sanitizeCssClass(options) {
+ return options.fn(this).replace(/[^_a-z0-9\u00a0-\uffff]/ig, '_');
+ }
+
+ _regexReplace(...args) {
+ // Usage:
+ // {{#regexReplace regex string [flags]}}content{{/regexReplace}}
+ // regex: regular expression string
+ // string: string to replace
+ // flags: optional flags for regular expression
+ // e.g. "i" for case-insensitive, "g" for replace all
+ let value = args[args.length - 1].fn(this);
+ if (args.length >= 3) {
+ try {
+ const flags = args.length > 3 ? args[2] : 'g';
+ const regex = new RegExp(args[0], flags);
+ value = value.replace(regex, args[1]);
+ } catch (e) {
+ return `${e}`;
+ }
+ }
+ return value;
+ }
+
+ _regexMatch(...args) {
+ // Usage:
+ // {{#regexMatch regex [flags]}}content{{/regexMatch}}
+ // regex: regular expression string
+ // flags: optional flags for regular expression
+ // e.g. "i" for case-insensitive, "g" for match all
+ let value = args[args.length - 1].fn(this);
+ if (args.length >= 2) {
+ try {
+ const flags = args.length > 2 ? args[1] : '';
+ const regex = new RegExp(args[0], flags);
+ const parts = [];
+ value.replace(regex, (g0) => parts.push(g0));
+ value = parts.join('');
+ } catch (e) {
+ return `${e}`;
+ }
+ }
+ return value;
+ }
+
+ _mergeTags(object, isGroupMode, isMergeMode) {
+ const tagSources = [];
+ if (isGroupMode || isMergeMode) {
+ for (const definition of object.definitions) {
+ tagSources.push(definition.definitionTags);
+ }
+ } else {
+ tagSources.push(object.definitionTags);
+ }
+
+ const tags = new Set();
+ for (const tagSource of tagSources) {
+ for (const tag of tagSource) {
+ tags.add(tag.name);
+ }
+ }
+
+ return [...tags].join(', ');
+ }
+}