/* * 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 */ class TemplateRenderer { constructor(japaneseUtil) { this._japaneseUtil = japaneseUtil; this._cache = new Map(); this._cacheMaxSize = 5; this._helpersRegistered = false; this._stateStack = null; } async render(template, data, marker) { 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); } const markerPre = data.marker; const markerPreHas = Object.prototype.hasOwnProperty.call(data, 'marker'); try { this._stateStack = [new Map()]; data.marker = marker; return instance(data).trim(); } finally { this._stateStack = null; if (markerPreHas) { data.marker = markerPre; } else { delete data.marker; } } } // 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)], ['eachUpTo', this._eachUpTo.bind(this)], ['spread', this._spread.bind(this)], ['op', this._op.bind(this)], ['get', this._get.bind(this)], ['set', this._set.bind(this)], ['scope', this._scope.bind(this)], ['property', this._property.bind(this)], ['noop', this._noop.bind(this)], ['isMoraPitchHigh', this._isMoraPitchHigh.bind(this)], ['getKanaMorae', this._getKanaMorae.bind(this)] ]; for (const [name, helper] of helpers) { this._registerHelper(name, helper); } } _registerHelper(name, helper) { function wrapper(...args) { return helper(this, ...args); } Handlebars.registerHelper(name, wrapper); } _escape(text) { return Handlebars.Utils.escapeExpression(text); } _dumpObject(context, options) { const dump = JSON.stringify(options.fn(context), null, 4); return this._escape(dump); } _furigana(context, ...args) { const {expression, reading} = this._getFuriganaExpressionAndReading(context, ...args); const segs = this._japaneseUtil.distributeFurigana(expression, reading); let result = ''; for (const seg of segs) { if (seg.furigana.length > 0) { result += `<ruby>${seg.text}<rt>${seg.furigana}</rt></ruby>`; } else { result += seg.text; } } return result; } _furiganaPlain(context, ...args) { const {expression, reading} = this._getFuriganaExpressionAndReading(context, ...args); const segs = this._japaneseUtil.distributeFurigana(expression, reading); let result = ''; for (const seg of segs) { if (seg.furigana.length > 0) { if (result.length > 0) { result += ' '; } result += `${seg.text}[${seg.furigana}]`; } else { result += seg.text; } } return result; } _getFuriganaExpressionAndReading(context, ...args) { const options = args[args.length - 1]; if (args.length >= 3) { return {expression: args[0], reading: args[1]}; } else { const {expression, reading} = options.fn(context); return {expression, reading}; } } _kanjiLinks(context, options) { const jp = this._japaneseUtil; let result = ''; for (const c of options.fn(context)) { if (jp.isCodePointKanji(c.codePointAt(0))) { result += `<a href="#" class="kanji-link">${c}</a>`; } else { result += c; } } return result; } _multiLine(context, options) { return options.fn(context).split('\n').join('<br>'); } _sanitizeCssClass(context, options) { return options.fn(context).replace(/[^_a-z0-9\u00a0-\uffff]/ig, '_'); } _regexReplace(context, ...args) { // Usage: // {{#regexReplace regex string [flags]}}content{{/regexReplace}} // regex: regular expression string // string: string to replace // flags: optional flags for regular expression // e.g. "i" for case-insensitive, "g" for replace all let value = args[args.length - 1].fn(context); if (args.length >= 3) { try { const flags = args.length > 3 ? args[2] : 'g'; const regex = new RegExp(args[0], flags); value = value.replace(regex, args[1]); } catch (e) { return `${e}`; } } return value; } _regexMatch(context, ...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(context); 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(context, 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(', '); } _eachUpTo(context, iterable, maxCount, options) { if (iterable) { const results = []; let any = false; for (const entry of iterable) { any = true; if (results.length >= maxCount) { break; } const processedEntry = options.fn(entry); results.push(processedEntry); } if (any) { return results.join(''); } } return options.inverse(context); } _spread(context, ...args) { const result = []; for (let i = 0, ii = args.length - 1; i < ii; ++i) { try { result.push(...args[i]); } catch (e) { // NOP } } return result; } _op(context, ...args) { switch (args.length) { case 3: return this._evaluateUnaryExpression(args[0], args[1]); case 4: return this._evaluateBinaryExpression(args[0], args[1], args[2]); case 5: return this._evaluateTernaryExpression(args[0], args[1], args[2], args[3]); default: return void 0; } } _evaluateUnaryExpression(operator, operand1) { switch (operator) { case '+': return +operand1; case '-': return -operand1; case '~': return ~operand1; case '!': return !operand1; default: return void 0; } } _evaluateBinaryExpression(operator, operand1, operand2) { switch (operator) { case '+': return operand1 + operand2; case '-': return operand1 - operand2; case '/': return operand1 / operand2; case '*': return operand1 * operand2; case '%': return operand1 % operand2; case '**': return operand1 ** operand2; case '==': return operand1 == operand2; // eslint-disable-line eqeqeq case '!=': return operand1 != operand2; // eslint-disable-line eqeqeq case '===': return operand1 === operand2; case '!==': return operand1 !== operand2; case '<': return operand1 < operand2; case '<=': return operand1 <= operand2; case '>': return operand1 > operand2; case '>=': return operand1 >= operand2; case '<<': return operand1 << operand2; case '>>': return operand1 >> operand2; case '>>>': return operand1 >>> operand2; case '&': return operand1 & operand2; case '|': return operand1 | operand2; case '^': return operand1 ^ operand2; case '&&': return operand1 && operand2; case '||': return operand1 || operand2; default: return void 0; } } _evaluateTernaryExpression(operator, operand1, operand2, operand3) { switch (operator) { case '?:': return operand1 ? operand2 : operand3; default: return void 0; } } _get(context, key) { for (let i = this._stateStack.length; --i >= 0;) { const map = this._stateStack[i]; if (map.has(key)) { return map.get(key); } } return void 0; } _set(context, ...args) { switch (args.length) { case 2: { const [key, options] = args; const value = options.fn(context); this._stateStack[this._stateStack.length - 1].set(key, value); } break; case 3: { const [key, value] = args; this._stateStack[this._stateStack.length - 1].set(key, value); } break; } return ''; } _scope(context, options) { try { this._stateStack.push(new Map()); return options.fn(context); } finally { if (this._stateStack.length > 1) { this._stateStack.pop(); } } } _property(context, ...args) { const ii = args.length - 1; if (ii <= 0) { return void 0; } try { let value = args[0]; for (let i = 1; i < ii; ++i) { value = value[args[i]]; } return value; } catch (e) { return void 0; } } _noop(context, options) { return options.fn(context); } _isMoraPitchHigh(context, index, position) { return this._japaneseUtil.isMoraPitchHigh(index, position); } _getKanaMorae(context, text) { return this._japaneseUtil.getKanaMorae(`${text}`); } }