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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.console;
import java.lang.reflect.Field;
import org.eclipse.core.expressions.EvaluationContext;
import org.eclipse.core.expressions.EvaluationResult;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.expressions.ExpressionConverter;
import org.eclipse.core.expressions.ExpressionTagNames;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.variables.VariablesPlugin;
import org.eclipse.ui.IPluginContribution;
import org.eclipse.ui.console.ConsolePlugin;
import org.eclipse.ui.console.IConsole;
import org.eclipse.ui.console.IPatternMatchListenerDelegate;
public class PatternMatchListenerExtension implements IPluginContribution {
private IConfigurationElement fConfig;
private Expression fEnablementExpression;
private String fPattern;
private String fQualifier;
private int fFlags = -1;
public PatternMatchListenerExtension(IConfigurationElement extension) {
fConfig = extension;
}
/*
* returns the integer value of the flags defined in java.util.regex.Pattern.
* Both <code>Pattern.MULTILINE</code> and <code>MULTILINE</code> will return
* the same value.
*/
public int parseFlags(String flagsElement) {
int val = 0;
if (flagsElement == null) {
return val;
}
try {
flagsElement = flagsElement.replaceAll("Pattern.", ""); //$NON-NLS-1$ //$NON-NLS-2$
String[] tokens = flagsElement.split("\\s\\|\\s"); //$NON-NLS-1$
Class clazz = Class.forName("java.util.regex.Pattern"); //$NON-NLS-1$
for (int i = 0; i < tokens.length; i++) {
Field field = clazz.getDeclaredField(tokens[i]);
val |= field.getInt(null);
}
} catch (ClassNotFoundException e) {
ConsolePlugin.log(e);
} catch (NoSuchFieldException e) {
ConsolePlugin.log(e);
} catch (IllegalAccessException e) {
ConsolePlugin.log(e);
}
return val;
}
public boolean isEnabledFor(IConsole console) throws CoreException {
EvaluationContext context = new EvaluationContext(null, console);
EvaluationResult evaluationResult = getEnablementExpression().evaluate(context);
return evaluationResult == EvaluationResult.TRUE;
}
public IPatternMatchListenerDelegate createDelegate() throws CoreException {
return (IPatternMatchListenerDelegate) fConfig.createExecutableExtension("class"); //$NON-NLS-1$
}
public Expression getEnablementExpression() throws CoreException {
if (fEnablementExpression == null) {
IConfigurationElement[] elements = fConfig.getChildren(ExpressionTagNames.ENABLEMENT);
IConfigurationElement enablement = elements.length > 0 ? elements[0] : null;
if (enablement != null) {
fEnablementExpression = ExpressionConverter.getDefault().perform(enablement);
}
}
return fEnablementExpression;
}
/*
* returns the regular expression to be matched.
*/
public String getPattern() {
if (fPattern == null) {
fPattern = fConfig.getAttributeAsIs("regex"); //$NON-NLS-1$
try {
fPattern = VariablesPlugin.getDefault().getStringVariableManager().performStringSubstitution(fPattern, false);
} catch (CoreException e) {
ConsolePlugin.log(e);
}
}
return fPattern;
}
/*
* returns the flags to be used by <code>Pattern.compile(pattern, flags)</code>
*/
public int getCompilerFlags() {
if(fFlags < 0) {
String flagsAttribute = fConfig.getAttributeAsIs("flags"); //$NON-NLS-1$
fFlags = parseFlags(flagsAttribute);
}
return fFlags;
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPluginContribution#getLocalId()
*/
public String getLocalId() {
return fConfig.getAttribute("id"); //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPluginContribution#getPluginId()
*/
public String getPluginId() {
return fConfig.getNamespace();
}
public String getQuickPattern() {
if (fQualifier == null) {
fQualifier = fConfig.getAttribute("qualifier"); //$NON-NLS-1$
try {
fQualifier = VariablesPlugin.getDefault().getStringVariableManager().performStringSubstitution(fQualifier, false);
} catch (CoreException e) {
ConsolePlugin.log(e);
}
}
return fQualifier;
}
}
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