yomichan/ext/js/templates/template-renderer.js

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/*
* Copyright (C) 2016-2021 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;
this._dataTypes = new Map();
}
registerDataType(name, {modifier=null, modifierPost=null}) {
this._dataTypes.set(name, {modifier, modifierPost});
}
async render(template, data, type) {
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);
}
let modifier = null;
let modifierPost = null;
if (typeof type === 'string') {
const typeInfo = this._dataTypes.get(type);
if (typeof typeInfo !== 'undefined') {
({modifier, modifierPost} = typeInfo);
}
}
try {
if (typeof modifier === 'function') {
data = modifier(data);
}
this._stateStack = [new Map()];
return instance(data).trim();
} finally {
this._stateStack = null;
if (typeof modifierPost === 'function') {
modifierPost(data);
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}
}
}
// 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)],
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['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)],
['typeof', this._getTypeof.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) {
if (!Array.isArray(tagSource)) { continue; }
for (const tag of tagSource) {
tags.add(tag.name);
}
}
return [...tags].join(', ');
}
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_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}`);
}
_getTypeof(context, ...args) {
const ii = args.length - 1;
const value = (ii > 0 ? args[0] : args[ii].fn(context));
return typeof value;
}
}