/*
* Copyright (c) 2012, 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.editor;
import com.google.dart.tools.ui.DartToolsPlugin;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextOperationTarget;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextUtilities;
import org.eclipse.jface.text.source.ISourceViewer;
import org.eclipse.jface.text.source.SourceViewerConfiguration;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.texteditor.TextEditorAction;
import java.util.HashMap;
import java.util.Map;
import java.util.ResourceBundle;
/**
* An action which toggles comment prefixes on the selected lines.
*/
public final class ToggleCommentAction extends TextEditorAction {
/** The text operation target */
private ITextOperationTarget fOperationTarget;
/** The document partitioning */
private String fDocumentPartitioning;
/** The comment prefixes */
private Map<String, String[]> fPrefixesMap;
/**
* Creates and initializes the action for the given text editor. The action configures its visual
* representation from the given resource bundle.
*
* @param bundle the resource bundle
* @param prefix a prefix to be prepended to the various resource keys (described in
* <code>ResourceAction</code> constructor), or <code>null</code> if none
* @param editor the text editor
* @see org.eclipse.ui.texteditor.ResourceAction#ResourceAction(ResourceBundle, String, int)
*/
public ToggleCommentAction(ResourceBundle bundle, String prefix, ITextEditor editor) {
super(bundle, prefix, editor);
}
public void configure(ISourceViewer sourceViewer, SourceViewerConfiguration configuration) {
fPrefixesMap = null;
String[] types = configuration.getConfiguredContentTypes(sourceViewer);
Map<String, String[]> prefixesMap = new HashMap<String, String[]>(types.length);
for (int i = 0; i < types.length; i++) {
String type = types[i];
String[] prefixes = configuration.getDefaultPrefixes(sourceViewer, type);
if (prefixes != null && prefixes.length > 0) {
int emptyPrefixes = 0;
for (int j = 0; j < prefixes.length; j++) {
if (prefixes[j].length() == 0) {
emptyPrefixes++;
}
}
if (emptyPrefixes > 0) {
String[] nonemptyPrefixes = new String[prefixes.length - emptyPrefixes];
for (int j = 0, k = 0; j < prefixes.length; j++) {
String prefix = prefixes[j];
if (prefix.length() != 0) {
nonemptyPrefixes[k] = prefix;
k++;
}
}
prefixes = nonemptyPrefixes;
}
prefixesMap.put(type, prefixes);
}
}
fDocumentPartitioning = configuration.getConfiguredDocumentPartitioning(sourceViewer);
fPrefixesMap = prefixesMap;
}
/**
* Implementation of the <code>IAction</code> prototype. Checks if the selected lines are all
* commented or not and uncomments/comments them respectively.
*/
@Override
public void run() {
if (fOperationTarget == null || fDocumentPartitioning == null || fPrefixesMap == null) {
return;
}
ITextEditor editor = getTextEditor();
if (editor == null) {
return;
}
if (!validateEditorInputState()) {
return;
}
final int operationCode;
if (isSelectionCommented(editor.getSelectionProvider().getSelection())) {
operationCode = ITextOperationTarget.STRIP_PREFIX;
} else {
operationCode = ITextOperationTarget.PREFIX;
}
Shell shell = editor.getSite().getShell();
if (!fOperationTarget.canDoOperation(operationCode)) {
if (shell != null) {
MessageDialog.openError(
shell,
DartEditorMessages.ToggleComment_error_title,
DartEditorMessages.ToggleComment_error_message);
}
return;
}
Display display = null;
if (shell != null && !shell.isDisposed()) {
display = shell.getDisplay();
}
BusyIndicator.showWhile(display, new Runnable() {
@Override
public void run() {
fOperationTarget.doOperation(operationCode);
}
});
}
/*
* @see TextEditorAction#setEditor(ITextEditor)
*/
@Override
public void setEditor(ITextEditor editor) {
super.setEditor(editor);
fOperationTarget = null;
}
/**
* Implementation of the <code>IUpdate</code> prototype method discovers the operation through the
* current editor's <code>ITextOperationTarget</code> adapter, and sets the enabled state
* accordingly.
*/
@Override
public void update() {
super.update();
if (!canModifyEditor()) {
setEnabled(false);
return;
}
ITextEditor editor = getTextEditor();
if (fOperationTarget == null && editor != null) {
fOperationTarget = (ITextOperationTarget) editor.getAdapter(ITextOperationTarget.class);
}
boolean isEnabled = (fOperationTarget != null
&& fOperationTarget.canDoOperation(ITextOperationTarget.PREFIX) && fOperationTarget.canDoOperation(ITextOperationTarget.STRIP_PREFIX));
setEnabled(isEnabled);
}
/**
* Returns the index of the first line whose start offset is in the given text range.
*
* @param region the text range in characters where to find the line
* @param document The document
* @return the first line whose start index is in the given range, -1 if there is no such line
*/
private int getFirstCompleteLineOfRegion(IRegion region, IDocument document) {
try {
int startLine = document.getLineOfOffset(region.getOffset());
int offset = document.getLineOffset(startLine);
if (offset >= region.getOffset()) {
return startLine;
}
offset = document.getLineOffset(startLine + 1);
return (offset > region.getOffset() + region.getLength() ? -1 : startLine + 1);
} catch (BadLocationException x) {
// should not happen
DartToolsPlugin.log(x);
}
return -1;
}
/**
* Creates a region describing the text block (something that starts at the beginning of a line)
* completely containing the current selection.
*
* @param selection The selection to use
* @param document The document
* @return the region describing the text block comprising the given selection
*/
private IRegion getTextBlockFromSelection(ITextSelection selection, IDocument document) {
try {
IRegion line = document.getLineInformationOfOffset(selection.getOffset());
int length = selection.getLength() == 0 ? line.getLength() : selection.getLength()
+ (selection.getOffset() - line.getOffset());
return new Region(line.getOffset(), length);
} catch (BadLocationException x) {
// should not happen
DartToolsPlugin.log(x);
}
return null;
}
/**
* Determines whether each line is prefixed by one of the prefixes.
*
* @param startLine Start line in document
* @param endLine End line in document
* @param prefixes Possible comment prefixes
* @param document The document
* @return <code>true</code> iff each line from <code>startLine</code> to and including
* <code>endLine</code> is prepended by one of the <code>prefixes</code>, ignoring
* whitespace at the begin of line
*/
private boolean isBlockCommented(int startLine, int endLine, String[] prefixes, IDocument document) {
try {
// check for occurrences of prefixes in the given lines
for (int i = startLine; i <= endLine; i++) {
IRegion line = document.getLineInformation(i);
String text = document.get(line.getOffset(), line.getLength());
int[] found = TextUtilities.indexOf(prefixes, text, 0);
if (found[0] == -1) {
// found a line which is not commented
return false;
}
String s = document.get(line.getOffset(), found[0]);
s = s.trim();
if (s.length() != 0) {
// found a line which is not commented
return false;
}
}
return true;
} catch (BadLocationException x) {
// should not happen
DartToolsPlugin.log(x);
}
return false;
}
/**
* Is the given selection single-line commented?
*
* @param selection Selection to check
* @return <code>true</code> iff all selected lines are commented
*/
private boolean isSelectionCommented(ISelection selection) {
if (!(selection instanceof ITextSelection)) {
return false;
}
ITextSelection textSelection = (ITextSelection) selection;
if (textSelection.getStartLine() < 0 || textSelection.getEndLine() < 0) {
return false;
}
IDocument document = getTextEditor().getDocumentProvider().getDocument(
getTextEditor().getEditorInput());
try {
IRegion block = getTextBlockFromSelection(textSelection, document);
ITypedRegion[] regions = TextUtilities.computePartitioning(
document,
fDocumentPartitioning,
block.getOffset(),
block.getLength(),
false);
// int lineCount = 0;
int[] lines = new int[regions.length * 2]; // [startline, endline,
// startline, endline, ...]
for (int i = 0, j = 0; i < regions.length; i++, j += 2) {
// start line of region
lines[j] = getFirstCompleteLineOfRegion(regions[i], document);
// end line of region
int length = regions[i].getLength();
int offset = regions[i].getOffset() + length;
if (length > 0) {
offset--;
}
lines[j + 1] = (lines[j] == -1 ? -1 : document.getLineOfOffset(offset));
// lineCount += lines[j + 1] - lines[j] + 1;
}
// Perform the check
for (int i = 0, j = 0; i < regions.length; i++, j += 2) {
String[] prefixes = fPrefixesMap.get(regions[i].getType());
if (prefixes != null && prefixes.length > 0 && lines[j] >= 0 && lines[j + 1] >= 0) {
if (!isBlockCommented(lines[j], lines[j + 1], prefixes, document)) {
return false;
}
}
}
return true;
} catch (BadLocationException x) {
// should not happen
DartToolsPlugin.log(x);
}
return false;
}
}