/*
* Copyright (c) 2011, the Dart project authors.
*
* Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
*
* 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 com.google.dart.tools.ui.internal.text.dart;
import com.google.dart.engine.ast.AstNode;
import com.google.dart.engine.ast.InterpolationExpression;
import com.google.dart.engine.ast.InterpolationString;
import com.google.dart.engine.ast.SimpleIdentifier;
import com.google.dart.engine.ast.visitor.NodeLocator;
import com.google.dart.tools.ui.internal.text.editor.CompilationUnitEditor;
import com.google.dart.tools.ui.internal.text.functions.DartPairMatcher;
import com.google.dart.tools.ui.internal.text.functions.ISourceVersionDependent;
import com.google.dart.tools.ui.text.editor.tmp.JavaScriptCore;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextDoubleClickStrategy;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
/**
* Double click strategy aware of Java identifier syntax rules.
*
* @coverage dart.editor.ui.text
*/
public class DartDoubleClickSelector_OLD implements ITextDoubleClickStrategy,
ISourceVersionDependent {
/**
* Detects java words depending on the source level. In 1.4 mode, detects <code>[[:ID:]]*</code>.
* In 1.5 mode, it also detects <code>@\s*[[:IDS:]][[:ID:]]*</code>. Character class definitions:
* <dl>
* <dt>[[:IDS:]]</dt>
* <dd>a java identifier start character</dd>
* <dt>[[:ID:]]</dt>
* <dd>a java identifier part character</dd>
* <dt>\s</dt>
* <dd>a white space character</dd>
* <dt>@</dt>
* <dd>the at symbol</dd>
* </dl>
*/
private static final class AtJavaIdentifierDetector implements ISourceVersionDependent {
private boolean fSelectAnnotations;
private static final int UNKNOWN = -1;
/* states */
private static final int WS = 0;
private static final int ID = 1;
private static final int IDS = 2;
private static final int AT = 3;
/* directions */
private static final int FORWARD = 0;
private static final int BACKWARD = 1;
/** The current state. */
private int fState;
/**
* The state at the anchor (if already detected by going the other way), or <code>UNKNOWN</code>
* .
*/
private int fAnchorState;
/** The current direction. */
private int fDirection;
/** The start of the detected word. */
private int fStart;
/** The end of the word. */
private int fEnd;
/**
* Returns the region containing <code>anchor</code> that is a java word.
*
* @param document the document from which to read characters
* @param anchor the offset around which to select a word
* @return the region describing a java word around <code>anchor</code>
*/
public IRegion getWordSelection(IDocument document, int anchor) {
try {
final int min = 0;
final int max = document.getLength();
setAnchor(anchor);
char c;
int offset = anchor;
while (offset < max) {
c = document.getChar(offset);
if (!forward(c, offset)) {
break;
}
++offset;
}
offset = anchor; // use to not select the previous word when right behind it
// offset = anchor - 1; // use to select the previous word when right behind it
while (offset >= min) {
c = document.getChar(offset);
if (!backward(c, offset)) {
break;
}
--offset;
}
return new Region(fStart, fEnd - fStart + 1);
} catch (BadLocationException x) {
return new Region(anchor, 0);
}
}
@Override
public void setSourceVersion(String version) {
if (JavaScriptCore.VERSION_1_5.compareTo(version) <= 0) {
fSelectAnnotations = true;
} else {
fSelectAnnotations = false;
}
}
/**
* Try to add a character to the word going backward. Only call after forward calls!
*
* @param c the character to add
* @param offset the offset of the character
* @return <code>true</code> if further characters may be added to the word
*/
private boolean backward(char c, int offset) {
checkDirection(BACKWARD);
switch (fState) {
case AT:
return false;
case IDS:
if (isAt(c)) {
fStart = offset;
fState = AT;
return false;
}
if (isWhitespace(c)) {
fState = WS;
return true;
}
//$FALL-THROUGH$
case ID:
if (isIdentifierStart(c)) {
fStart = offset;
fState = IDS;
return true;
}
if (isIdentifierPart(c)) {
fStart = offset;
fState = ID;
return true;
}
return false;
case WS:
if (isWhitespace(c)) {
return true;
}
if (isAt(c)) {
fStart = offset;
fState = AT;
return false;
}
return false;
default:
return false;
}
}
/**
* If the direction changes, set state to be the previous anchor state.
*
* @param direction the new direction
*/
private void checkDirection(int direction) {
if (fDirection == direction) {
return;
}
if (direction == FORWARD) {
if (fStart <= fEnd) {
fState = fAnchorState;
} else {
fState = UNKNOWN;
}
} else if (direction == BACKWARD) {
if (fEnd >= fStart) {
fState = fAnchorState;
} else {
fState = UNKNOWN;
}
}
fDirection = direction;
}
/**
* Try to add a character to the word going forward.
*
* @param c the character to add
* @param offset the offset of the character
* @return <code>true</code> if further characters may be added to the word
*/
private boolean forward(char c, int offset) {
checkDirection(FORWARD);
switch (fState) {
case WS:
case AT:
if (isWhitespace(c)) {
fState = WS;
return true;
}
if (isIdentifierStart(c)) {
fEnd = offset;
fState = IDS;
return true;
}
return false;
case IDS:
case ID:
if (isIdentifierStart(c)) {
fEnd = offset;
fState = IDS;
return true;
}
if (isIdentifierPart(c)) {
fEnd = offset;
fState = ID;
return true;
}
return false;
case UNKNOWN:
if (isIdentifierStart(c)) {
fEnd = offset;
fState = IDS;
fAnchorState = fState;
return true;
}
if (isIdentifierPart(c)) {
fEnd = offset;
fState = ID;
fAnchorState = fState;
return true;
}
if (isWhitespace(c)) {
fState = WS;
fAnchorState = fState;
return true;
}
if (isAt(c)) {
fStart = offset;
fState = AT;
fAnchorState = fState;
return true;
}
return false;
default:
return false;
}
}
private boolean isAt(char c) {
return fSelectAnnotations && c == '@';
}
private boolean isIdentifierPart(char c) {
return Character.isJavaIdentifierPart(c);
}
private boolean isIdentifierStart(char c) {
return Character.isJavaIdentifierStart(c);
}
private boolean isWhitespace(char c) {
return fSelectAnnotations && Character.isWhitespace(c);
}
/**
* Initializes the detector at offset <code>anchor</code>.
*
* @param anchor the offset of the double click
*/
private void setAnchor(int anchor) {
fState = UNKNOWN;
fAnchorState = UNKNOWN;
fDirection = UNKNOWN;
fStart = anchor;
fEnd = anchor - 1;
}
}
protected static final char[] BRACKETS = {'{', '}', '(', ')', '[', ']', '<', '>'};
protected DartPairMatcher fPairMatcher = new DartPairMatcher(BRACKETS);
protected final AtJavaIdentifierDetector fWordDetector = new AtJavaIdentifierDetector();
public DartDoubleClickSelector_OLD() {
super();
}
/**
* @see ITextDoubleClickStrategy#doubleClicked
*/
@Override
public void doubleClicked(ITextViewer textViewer) {
int offset = textViewer.getSelectedRange().x;
if (offset < 0) {
return;
}
IDocument document = textViewer.getDocument();
IRegion region = fPairMatcher.match(document, offset);
if (region != null && region.getLength() >= 2) {
textViewer.setSelectedRange(region.getOffset() + 1, region.getLength() - 2);
} else if (textViewer instanceof CompilationUnitEditor.AdaptedSourceViewer) {
CompilationUnitEditor editor = ((CompilationUnitEditor.AdaptedSourceViewer) textViewer).getEditor();
NodeLocator locator = new NodeLocator(offset);
AstNode node = locator.searchWithin(editor.getInputUnit());
if (node instanceof SimpleIdentifier) {
region = new Region(node.getOffset(), node.getLength());
} else if (node instanceof InterpolationString) {
region = computeStringRegion(node);
if (region == null) {
region = selectWord(document, offset);
}
} else if (node instanceof InterpolationExpression) {
region = new Region(node.getOffset(), node.getLength());
} else {
region = selectWord(document, offset);
}
textViewer.setSelectedRange(region.getOffset(), region.getLength());
} else {
region = selectWord(document, offset);
textViewer.setSelectedRange(region.getOffset(), region.getLength());
}
}
@Override
public void setSourceVersion(String version) {
fWordDetector.setSourceVersion(version);
}
protected IRegion computeStringRegion(AstNode node) {
int start = node.getOffset();
int originalStart = start;
int end = node.getEnd();
InterpolationString str = (InterpolationString) node;
String chars = str.getContents().getLexeme();
if (chars != null && chars.length() > 0) {
char ch = chars.charAt(0);
if (ch == '\'' || ch == '"') {
start += 1;
}
if (start == originalStart || chars.length() > 1) {
ch = chars.charAt(chars.length() - 1);
if (ch == '\'' || ch == '"') {
end -= 1;
}
}
return new Region(start, end - start);
}
return null; // should not happen
}
protected void selectExpression(AstNode node, ITextViewer textViewer) {
textViewer.setSelectedRange(node.getOffset(), node.getLength());
}
protected IRegion selectWord(IDocument document, int anchor) {
return fWordDetector.getWordSelection(document, anchor);
}
}