/*******************************************************************************
* Copyright (c) 2004, 2008 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.jst.jsp.ui.internal.style.jspel;
import java.util.Collection;
import org.eclipse.jdt.ui.PreferenceConstants;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceConverter;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jst.jsp.ui.internal.JSPUIPlugin;
import org.eclipse.jst.jsp.ui.internal.style.IStyleConstantsJSP;
import org.eclipse.jst.jsp.ui.internal.style.java.IStyleConstantsJSPJava;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Display;
import org.eclipse.wst.html.ui.internal.style.IStyleConstantsHTML;
import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;
import org.eclipse.wst.sse.ui.internal.preferences.ui.ColorHelper;
import org.eclipse.wst.sse.ui.internal.provisional.style.AbstractLineStyleProvider;
import org.eclipse.wst.sse.ui.internal.provisional.style.LineStyleProvider;
import org.eclipse.wst.xml.ui.internal.style.IStyleConstantsXML;
// Note: many of the methods in this class were based on (or copied from)
// those
// found in the example Java Editor
public class LineStyleProviderForJSPEL extends AbstractLineStyleProvider implements LineStyleProvider {
/** The scanner it uses */
private JSPELCodeScanner fScanner;
public LineStyleProviderForJSPEL() {
super();
fScanner = new JSPELCodeScanner();
}
/**
* Adds style information to the given text presentation.
*
* @param presentation
* the text presentation to be extended
* @param offset
* the offset of the range to be styled
* @param length
* the length of the range to be styled
* @param attr
* the attribute describing the style of the range to be styled
*/
private void addRange(Collection presentation, int offset, int length, TextAttribute attr) {
// support for user defined backgroud for JSP scriptlet regions
String styleString = JSPUIPlugin.getDefault().getPreferenceStore().getString(IStyleConstantsJSP.JSP_CONTENT);
String[] prefs = ColorHelper.unpackStylePreferences(styleString);
Color bgColor = (prefs != null && prefs.length == 3 && prefs[1].startsWith("#") && Display.getCurrent() != null) //$NON-NLS-1$
? new Color(Display.getCurrent(), ColorHelper.toRGB(prefs[1])) : attr.getBackground();
presentation.add(new StyleRange(offset, length, attr.getForeground(), bgColor, attr.getStyle()));
}
/**
* Looks up the colorKey in the preference store and adds the style
* information to list of TextAttributes
*
* @param colorKey
*/
private void addJavaTextAttribute(String colorKey) {
IPreferenceStore store = getJavaColorPreferences();
if (store != null && colorKey != null) {
TextAttribute ta = null;
if (colorKey == IStyleConstantsJSPEL.EL_KEYWORD) {
// keyword
RGB foreground = PreferenceConverter.getColor(store, PreferenceConstants.EDITOR_JAVA_KEYWORD_COLOR);
boolean bold = store.getBoolean(PreferenceConstants.EDITOR_JAVA_KEYWORD_BOLD);
boolean italics = store.getBoolean(PreferenceConstants.EDITOR_JAVA_KEYWORD_ITALIC);
boolean strikethrough = store.getBoolean(PreferenceConstants.EDITOR_JAVA_KEYWORD_STRIKETHROUGH);
boolean underline = store.getBoolean(PreferenceConstants.EDITOR_JAVA_KEYWORD_UNDERLINE);
int style = SWT.NORMAL;
if (bold) {
style = style | SWT.BOLD;
}
if (italics) {
style = style | SWT.ITALIC;
}
if (strikethrough) {
style = style | TextAttribute.STRIKETHROUGH;
}
if (underline) {
style = style | TextAttribute.UNDERLINE;
}
ta = createTextAttribute(foreground, null, style);
} else if (colorKey == IStyleConstantsJSPEL.EL_DEFAULT) {
// default
RGB foreground = PreferenceConverter.getColor(store, PreferenceConstants.EDITOR_JAVA_DEFAULT_COLOR);
boolean bold = store.getBoolean(PreferenceConstants.EDITOR_JAVA_DEFAULT_BOLD);
boolean italics = store.getBoolean(PreferenceConstants.EDITOR_JAVA_DEFAULT_ITALIC);
boolean strikethrough = store.getBoolean(PreferenceConstants.EDITOR_JAVA_DEFAULT_STRIKETHROUGH);
boolean underline = store.getBoolean(PreferenceConstants.EDITOR_JAVA_DEFAULT_UNDERLINE);
int style = SWT.NORMAL;
if (bold) {
style = style | SWT.BOLD;
}
if (italics) {
style = style | SWT.ITALIC;
}
if (strikethrough) {
style = style | TextAttribute.STRIKETHROUGH;
}
if (underline) {
style = style | TextAttribute.UNDERLINE;
}
ta = createTextAttribute(foreground, null, style);
}
if (ta != null) {
getTextAttributes().put(colorKey, ta);
fScanner.setTokenData(colorKey, ta);
}
}
}
/**
* Returns a text attribute encoded in the given token. If the token's
* data is not <code>null</code> and a text attribute it is assumed that
* it is the encoded text attribute. It returns the default text attribute
* if there is no encoded text attribute found.
*
* @param token
* the token whose text attribute is to be determined
* @return the token's text attribute
*/
private TextAttribute getTokenTextAttribute(IToken token) {
TextAttribute ta = null;
Object data = token.getData();
if (data instanceof TextAttribute)
ta = (TextAttribute) data;
else {
ta = (TextAttribute) getTextAttributes().get(IStyleConstantsJSPJava.JAVA_DEFAULT);
}
return ta;
}
protected void loadColors() {
addTextAttribute(IStyleConstantsHTML.SCRIPT_AREA_BORDER);
addTextAttribute(IStyleConstantsXML.TAG_ATTRIBUTE_NAME);
addTextAttribute(IStyleConstantsXML.TAG_ATTRIBUTE_VALUE);
addJavaTextAttribute(IStyleConstantsJSPJava.JAVA_KEYWORD);
addJavaTextAttribute(IStyleConstantsJSPJava.JAVA_DEFAULT);
fScanner.initializeRules();
}
protected void handlePropertyChange(PropertyChangeEvent event) {
String styleKey = null;
String javaStyleKey = null;
if (event != null) {
String prefKey = event.getProperty();
// check if preference changed is a style preference
if (IStyleConstantsHTML.SCRIPT_AREA_BORDER.equals(prefKey)) {
styleKey = IStyleConstantsHTML.SCRIPT_AREA_BORDER;
} else if (IStyleConstantsXML.TAG_ATTRIBUTE_NAME.equals(prefKey)) {
styleKey = IStyleConstantsXML.TAG_ATTRIBUTE_NAME;
} else if (IStyleConstantsXML.TAG_ATTRIBUTE_VALUE.equals(prefKey)) {
styleKey = IStyleConstantsXML.TAG_ATTRIBUTE_VALUE;
} else if (PreferenceConstants.EDITOR_JAVA_KEYWORD_COLOR.equals(prefKey) || (PreferenceConstants.EDITOR_JAVA_KEYWORD_BOLD.equals(prefKey)) || (PreferenceConstants.EDITOR_JAVA_KEYWORD_ITALIC.equals(prefKey))) {
javaStyleKey = IStyleConstantsJSPEL.EL_KEYWORD;
} else if (PreferenceConstants.EDITOR_JAVA_DEFAULT_COLOR.equals(prefKey) || (PreferenceConstants.EDITOR_JAVA_DEFAULT_BOLD.equals(prefKey)) || (PreferenceConstants.EDITOR_JAVA_DEFAULT_ITALIC.equals(prefKey))) {
javaStyleKey = IStyleConstantsJSPEL.EL_DEFAULT;
}
}
if (styleKey != null) {
// overwrite style preference with new value
addTextAttribute(styleKey);
}
if (javaStyleKey != null) {
// overwrite style preference with new value
addJavaTextAttribute(javaStyleKey);
fScanner.initializeRules();
}
if (styleKey != null || javaStyleKey != null) {
// force a full update of the text viewer
fRecHighlighter.refreshDisplay();
}
}
public boolean prepareRegions(ITypedRegion typedRegion, int ssssrequestedStart, int ssssrequestedLength, Collection holdResults) {
boolean result = true;
try {
// ideally, eventually, we'll have a "virtualDocument" we can
// refer to, but for now ... we'll simple rescan the one region.
// use simple adjustment (since "sub-content" starts at 0
int offsetAdjustment = typedRegion.getOffset();
String content = fDocument.get(typedRegion.getOffset(), typedRegion.getLength());
IDocument document = new Document(content);
int lastStart = 0;
int length = 0;
IToken lastToken = Token.UNDEFINED;
int remainingLength = typedRegion.getLength();
fScanner.setRange(document, lastStart, remainingLength);
while (true) {
IToken token = fScanner.nextToken();
if (token.isEOF()) {
if (!lastToken.isUndefined() && length != 0)
addRange(holdResults, lastStart + offsetAdjustment, length, getTokenTextAttribute(lastToken));
break;
}
if (token.isWhitespace()) {
length += fScanner.getTokenLength();
continue;
}
if (lastToken.isUndefined()) {
lastToken = token;
length += fScanner.getTokenLength();
continue;
}
if (token != lastToken) {
addRange(holdResults, lastStart + offsetAdjustment, length, getTokenTextAttribute(lastToken));
lastToken = token;
lastStart = fScanner.getTokenOffset();
length = fScanner.getTokenLength();
continue;
}
length += fScanner.getTokenLength();
}
} catch (BadLocationException e) {
// shouldn't happen, but we don't want it to stop other
// highlighting, if it does.
result = false;
}
return result;
}
protected IPreferenceStore getColorPreferences() {
return JSPUIPlugin.getDefault().getPreferenceStore();
}
private IPreferenceStore getJavaColorPreferences() {
return PreferenceConstants.getPreferenceStore();
}
protected void registerPreferenceManager() {
getColorPreferences().addPropertyChangeListener(fPreferenceListener);
getJavaColorPreferences().addPropertyChangeListener(fPreferenceListener);
}
protected void unRegisterPreferenceManager() {
getColorPreferences().removePropertyChangeListener(fPreferenceListener);
getJavaColorPreferences().removePropertyChangeListener(fPreferenceListener);
}
protected TextAttribute getAttributeFor(ITextRegion region) {
return null;
}
}