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Modern server-side Java template engine for both web and standalone environments

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/*
 * =============================================================================
 *
 *   Copyright (c) 2011-2018, The THYMELEAF team (http://www.thymeleaf.org)
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 * =============================================================================
 */
package org.thymeleaf.engine;

import org.thymeleaf.context.ITemplateContext;
import org.thymeleaf.model.ICDATASection;
import org.thymeleaf.model.IComment;
import org.thymeleaf.model.IProcessableElementTag;
import org.thymeleaf.model.IText;
import org.thymeleaf.standard.expression.FragmentExpression;
import org.thymeleaf.standard.expression.IStandardExpression;
import org.thymeleaf.standard.expression.IStandardExpressionParser;
import org.thymeleaf.standard.expression.StandardExpressions;

/**
 * 

* Utility class containing methods that answer questions about the contents or features * of specific event objects. *

*

* Meant for internal use only. *

* * @author Daniel Fernández * @since 3.0.0 * */ public final class EngineEventUtils { public static boolean isWhitespace(final IText text) { if (text == null) { return false; } if (text instanceof Text) { return ((Text) text).isWhitespace(); } return computeWhitespace(text); } public static boolean isWhitespace(final ICDATASection cdataSection) { if (cdataSection == null) { return false; } if (cdataSection instanceof CDATASection) { return ((CDATASection) cdataSection).isWhitespace(); } return computeWhitespace(cdataSection.getContent()); } public static boolean isWhitespace(final IComment comment) { if (comment == null) { return false; } if (comment instanceof Comment) { return ((Comment) comment).isWhitespace(); } return computeWhitespace(comment.getContent()); } public static boolean isInlineable(final IText text) { if (text == null) { return false; } if (text instanceof Text) { return ((Text) text).isInlineable(); } return computeInlineable(text); } public static boolean isInlineable(final ICDATASection cdataSection) { if (cdataSection == null) { return false; } if (cdataSection instanceof CDATASection) { return ((CDATASection) cdataSection).isInlineable(); } return computeInlineable(cdataSection.getContent()); } public static boolean isInlineable(final IComment comment) { if (comment == null) { return false; } if (comment instanceof Comment) { return ((Comment) comment).isInlineable(); } return computeInlineable(comment.getContent()); } private static boolean computeWhitespace(final CharSequence text) { int n = text.length(); if (n == 0) { return false; } char c; while (n-- != 0) { c = text.charAt(n); if (!Character.isWhitespace(c)) { return false; } } return true; } private static boolean computeInlineable(final CharSequence text) { int n = text.length(); if (n == 0) { return false; } char c0, c1; c0 = 0x0; int inline = 0; while (n-- != 0) { c1 = text.charAt(n); if (c1 == ']' && c0 == ']') { inline = 1; } else if (c1 == ')' && c0 == ']') { inline = 2; } else if (inline == 1 && c1 == '[' && c0 == '[') { return true; } else if (inline == 2 && c1 == '[' && c0 == '(') { return true; } c0 = c1; } return false; } /* * The idea behind this method is to cache in the Attribute object itself the IStandardExpression object corresponding * with the expression to be executed, so that we don't have to hit the expression cache at all */ public static IStandardExpression computeAttributeExpression( final ITemplateContext context, final IProcessableElementTag tag, final AttributeName attributeName, final String attributeValue) { if (!(tag instanceof AbstractProcessableElementTag)) { return parseAttributeExpression(context, attributeValue); } final AbstractProcessableElementTag processableElementTag = (AbstractProcessableElementTag)tag; final Attribute attribute = (Attribute) processableElementTag.getAttribute(attributeName); IStandardExpression expression = attribute.getCachedStandardExpression(); if (expression != null) { return expression; } expression = parseAttributeExpression(context, attributeValue); // If the expression has been correctly parsed AND it does not contain preprocessing marks (_), nor it is a FragmentExpression, cache it! if (expression != null && !(expression instanceof FragmentExpression) && attributeValue.indexOf('_') < 0) { attribute.setCachedStandardExpression(expression); } return expression; } private static IStandardExpression parseAttributeExpression(final ITemplateContext context, final String attributeValue) { final IStandardExpressionParser expressionParser = StandardExpressions.getExpressionParser(context.getConfiguration()); return expressionParser.parseExpression(context, attributeValue); } private EngineEventUtils() { super(); } }




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