/*
* Created on 09.06.2004
*
* TODO To change the template for this generated file go to Window -
* Preferences - Java - Code Generation - Code and Comments
*/
package com.liferay.ide.velocity.vaulttec.ui.editor.actions;
import java.util.HashMap;
import java.util.Map;
import java.util.ResourceBundle;
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.ResourceAction;
import org.eclipse.ui.texteditor.TextEditorAction;
/**
* An action which toggles comment prefixes on the selected lines.
*
* @since 3.0
*/
public final class ToggleCommentAction extends TextEditorAction
{
/** The text operation target */
private ITextOperationTarget fOperationTarget;
/** The document partitioning */
private String fDocumentPartitioning;
/** The comment prefixes */
private Map 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 ResourceAction#ResourceAction(ResourceBundle, String, int)
*/
public ToggleCommentAction(ResourceBundle bundle, String prefix, ITextEditor editor)
{
super(bundle, prefix, editor);
}
/**
* Implementation of the <code>IAction</code> prototype. Checks if the
* selected lines are all commented or not and uncomments/comments them
* respectively.
*/
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,
// JavaEditorMessages.getString("ToggleComment.error.title"),
// JavaEditorMessages.getString("ToggleComment.error.message"));
// //$NON-NLS-1$ //$NON-NLS-2$
return;
}
Display display = null;
if (shell != null && !shell.isDisposed()) display = shell.getDisplay();
BusyIndicator.showWhile(display, new Runnable() {
public void run()
{
fOperationTarget.doOperation(operationCode);
}
});
}
/**
* 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 = (String[]) 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
}
return false;
}
/**
* 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
// JavaPlugin.log(x);
}
return null;
}
/**
* 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
}
return -1;
}
/**
* 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
// JavaPlugin.log(x);
}
return false;
}
/**
* 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.
*/
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);
}
/*
* @see TextEditorAction#setEditor(ITextEditor)
*/
public void setEditor(ITextEditor editor)
{
super.setEditor(editor);
fOperationTarget = null;
}
public void configure(ISourceViewer sourceViewer, SourceViewerConfiguration configuration)
{
fPrefixesMap = null;
String[] types = configuration.getConfiguredContentTypes(sourceViewer);
Map prefixesMap = new HashMap(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;
}
}