/*
* =============================================================================
*
* Copyright (c) 2011-2014, 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.standard.inliner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.thymeleaf.Arguments;
import org.thymeleaf.Configuration;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.dom.AbstractTextNode;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.standard.expression.IStandardExpression;
import org.thymeleaf.standard.expression.IStandardExpressionParser;
import org.thymeleaf.standard.expression.StandardExpressions;
/**
*
* @author Daniel Fernández
*
* @since 1.1.2
*
*/
public abstract class AbstractStandardScriptingTextInliner implements IStandardTextInliner {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
public static final String SCRIPT_ADD_INLINE_EVAL = "/\\*\\[\\+(.*?)\\+\\]\\*\\/";
public static final Pattern SCRIPT_ADD_INLINE_EVAL_PATTERN = Pattern.compile(SCRIPT_ADD_INLINE_EVAL, Pattern.DOTALL);
public static final String SCRIPT_REMOVE_INLINE_EVAL = "\\/\\*\\[\\-(.*?)\\-\\]\\*\\/";
public static final Pattern SCRIPT_REMOVE_INLINE_EVAL_PATTERN = Pattern.compile(SCRIPT_REMOVE_INLINE_EVAL, Pattern.DOTALL);
public static final String SCRIPT_VARIABLE_EXPRESSION_INLINE_EVAL = "\\/\\*(\\[\\[(.*?)\\]\\])\\*\\/([^\n]*?)\n";
public static final Pattern SCRIPT_VARIABLE_EXPRESSION_INLINE_EVAL_PATTERN = Pattern.compile(SCRIPT_VARIABLE_EXPRESSION_INLINE_EVAL, Pattern.DOTALL);
public static final String SCRIPT_INLINE_EVAL = "\\[\\[(.*?)\\]\\]";
public static final Pattern SCRIPT_INLINE_EVAL_PATTERN = Pattern.compile(SCRIPT_INLINE_EVAL, Pattern.DOTALL);
public static final String SCRIPT_INLINE_PREFIX = "[[";
public static final String SCRIPT_INLINE_SUFFIX = "]]";
protected AbstractStandardScriptingTextInliner() {
super();
}
public final void inline(final Arguments arguments, final AbstractTextNode text) {
final String content = text.getOriginalContent();
final String javascriptContent =
processScriptingInline(content, arguments);
// We set content as "escaped" in order to avoid further escaping
text.setContent(javascriptContent, true);
}
private String processScriptingInline(
final String input, final Arguments arguments) {
return
processScriptingVariableInline(
processScriptingVariableExpressionInline(
processScriptingAddInline(
processScriptingRemoveInline(
input)
)
),
arguments);
}
private String processScriptingAddInline(final String input) {
final Matcher matcher = SCRIPT_ADD_INLINE_EVAL_PATTERN.matcher(input);
if (matcher.find()) {
final StringBuilder strBuilder = new StringBuilder();
int curr = 0;
do {
strBuilder.append(input.substring(curr,matcher.start(0)));
final String match = matcher.group(1);
if (this.logger.isTraceEnabled()) {
this.logger.trace("[THYMELEAF][{}] Adding inlined javascript text \"{}\"", TemplateEngine.threadIndex(), match);
}
strBuilder.append(match);
curr = matcher.end(0);
} while (matcher.find());
strBuilder.append(input.substring(curr));
return strBuilder.toString();
}
return input;
}
private String processScriptingRemoveInline(final String input) {
final Matcher matcher = SCRIPT_REMOVE_INLINE_EVAL_PATTERN.matcher(input);
if (matcher.find()) {
final StringBuilder strBuilder = new StringBuilder();
int curr = 0;
do {
strBuilder.append(input.substring(curr,matcher.start(0)));
final String match = matcher.group(1);
if (this.logger.isTraceEnabled()) {
this.logger.trace("[THYMELEAF][{}] Removing inlined javascript text \"{}\"", TemplateEngine.threadIndex(), match);
}
curr = matcher.end(0);
} while (matcher.find());
strBuilder.append(input.substring(curr));
return strBuilder.toString();
}
return input;
}
private String processScriptingVariableExpressionInline(final String input) {
final Matcher matcher = SCRIPT_VARIABLE_EXPRESSION_INLINE_EVAL_PATTERN.matcher(input);
if (matcher.find()) {
final StringBuilder strBuilder = new StringBuilder();
int curr = 0;
do {
strBuilder.append(input.substring(curr,matcher.start(0)));
strBuilder.append(matcher.group(1));
strBuilder.append(computeLineEndForInline(matcher.group(3)));
strBuilder.append('\n');
curr = matcher.end(0);
} while (matcher.find());
strBuilder.append(input.substring(curr));
return strBuilder.toString();
}
return input;
}
private static String computeLineEndForInline(final String lineRemainder) {
if (lineRemainder == null) {
return "";
}
char literalDelimiter = 0;
int arrayLevel = 0;
int objectLevel = 0;
final int len = lineRemainder.length();
for (int i = 0; i < len; i++) {
final char c = lineRemainder.charAt(i);
if (c == '\'' || c == '"') {
if (literalDelimiter == 0 || i == 0) {
literalDelimiter = c;
} else if (c == literalDelimiter && lineRemainder.charAt(i - 1) != '\\') {
literalDelimiter = 0;
}
} else if (c == '{' && literalDelimiter == 0) {
objectLevel++;
} else if (c == '}' && literalDelimiter == 0) {
objectLevel--;
} else if (c == '[' && literalDelimiter == 0) {
arrayLevel++;
} else if (c == ']' && literalDelimiter == 0) {
arrayLevel--;
}
if (literalDelimiter == 0 && arrayLevel == 0 && objectLevel == 0) {
if (c == ';' || c == ',' || c == ')') {
return lineRemainder.substring(i);
}
if (c == '/' && ((i+1) < len)) {
final char c1 = lineRemainder.charAt(i+1);
if (c1 == '/' || c1 == '*') {
return lineRemainder.substring(i);
}
}
}
}
return "";
}
private String processScriptingVariableInline(final String input, final Arguments arguments) {
final Matcher matcher = SCRIPT_INLINE_EVAL_PATTERN.matcher(input);
if (matcher.find()) {
final Configuration configuration = arguments.getConfiguration();
final IStandardExpressionParser expressionParser = StandardExpressions.getExpressionParser(configuration);
final StringBuilder strBuilder = new StringBuilder();
int curr = 0;
do {
strBuilder.append(input.substring(curr,matcher.start(0)));
final String match = matcher.group(1);
if (this.logger.isTraceEnabled()) {
this.logger.trace("[THYMELEAF][{}] Applying javascript variable inline evaluation on \"{}\"", TemplateEngine.threadIndex(), match);
}
IStandardExpression expression = null;
try {
expression = expressionParser.parseExpression(configuration, arguments, match);
} catch (final TemplateProcessingException ignored) {
// If it is not a standard expression, just output it as original
strBuilder.append(SCRIPT_INLINE_PREFIX).append(match).append(SCRIPT_INLINE_SUFFIX);
}
if (expression != null) {
// If an exception raises during execution, we should let it through
final Object result = expression.execute(configuration, arguments);
strBuilder.append(formatEvaluationResult(result));
}
curr = matcher.end(0);
} while (matcher.find());
strBuilder.append(input.substring(curr));
return strBuilder.toString();
}
return input;
}
protected abstract String formatEvaluationResult(final Object result);
}