bundles/org.eclipse.wst.css.ui/src/org/eclipse/wst/css/ui/internal/autoedit/StructuredAutoEditStrategyCSS.java - sourceediting/webtools.sourceediting - Git at Google

 /*******************************************************************************
  * Copyright (c) 2004, 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.wst.css.ui.internal.autoedit;

 import org.eclipse.core.runtime.Preferences;
 import org.eclipse.jface.text.BadLocationException;
 import org.eclipse.jface.text.DocumentCommand;
 import org.eclipse.jface.text.IAutoEditStrategy;
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.jface.text.IRegion;
 import org.eclipse.ui.IEditorPart;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.IWorkbenchWindow;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.texteditor.ITextEditor;
 import org.eclipse.ui.texteditor.ITextEditorExtension3;
 import org.eclipse.wst.css.core.internal.CSSCorePlugin;
 import org.eclipse.wst.css.core.internal.parserz.CSSRegionContexts;
 import org.eclipse.wst.css.core.internal.preferences.CSSCorePreferenceNames;
 import org.eclipse.wst.css.core.internal.util.RegionIterator;
 import org.eclipse.wst.css.ui.internal.Logger;
 import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument;
 import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion;
 import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;

 public class StructuredAutoEditStrategyCSS implements IAutoEditStrategy {
 	protected IStructuredDocument structuredDocument = null;

 	class CompoundRegion {

 		CompoundRegion(IStructuredDocumentRegion documentRegion, ITextRegion textRegion) {
 			super();
 			this.documentRegion = documentRegion;
 			this.textRegion = textRegion;
 		}

 		IStructuredDocumentRegion getDocumentRegion() {
 			return documentRegion;
 		}

 		ITextRegion getTextRegion() {
 			return textRegion;
 		}

 		int getStart() {
 			return textRegion.getStart();
 		}

 		int getEnd() {
 			return textRegion.getEnd();
 		}

 		String getType() {
 			return textRegion.getType();
 		}

 		String getText() {
 			return documentRegion.getText(textRegion);
 		}

 		int getStartOffset() {
 			return documentRegion.getStartOffset(textRegion);
 		}

 		int getEndOffset() {
 			return documentRegion.getEndOffset(textRegion);
 		}

 		private IStructuredDocumentRegion documentRegion;
 		private ITextRegion textRegion;

 	}

 	/**
 	 */
 	protected void autoIndentAfterClose(DocumentCommand command, String regionType) {
 		if (!setRangeForClose(command))
 			return;

 		int position = command.offset + command.length;

 		if (position == -1 || structuredDocument.getLength() == 0) {
 			return;
 		}

 		// get open brace region
 		CompoundRegion region = prevCorrespondence(position, regionType);

 		// get indentation
 		String str = getIndentFor(region, false);

 		// append to input
 		if (str != null)
 			command.text = str + command.text;
 	}

 	/**
 	 * Copies the indentation of the previous line.
 	 */
 	protected void autoIndentAfterNewLine(DocumentCommand command) {
 		// select nearest white spaces to replace with new-line
 		setRangeForNewLine(command);

 		// get position
 		int position = command.offset;

 		if (position == -1 || structuredDocument.getLength() == 0) {
 			return;
 		}

 		// get current region
 		CompoundRegion currentRegion = getRegion(command.offset + command.length);

 		// get key region
 		CompoundRegion keyRegion = getPrevKeyRegion(position, currentRegion);

 		// get indent string
 		String str = getIndentFor(keyRegion, true);

 		// check another indentation
 		int shift = needShift(keyRegion, command.offset + command.length);

 		// create text to replace
 		StringBuffer buf = new StringBuffer(command.text);
 		if (str != null)
 			buf.append(str);
 		while (shift-- != 0)
 			buf.append(getIndentString());
 		command.text = buf.toString();

 	}

 	/**
 	 */
 	public void customizeDocumentCommand(IDocument document, DocumentCommand command) {
 		Object textEditor = getActiveTextEditor();
 		if (!(textEditor instanceof ITextEditorExtension3 && ((ITextEditorExtension3) textEditor).getInsertMode() == ITextEditorExtension3.SMART_INSERT))
 			return;

 		// return;
 		// /*
 		structuredDocument = (IStructuredDocument) document;

 		if (command.length == 0 && command.text != null) {
 			if (endsWith(document.getLegalLineDelimiters(), command.text) != -1) {
 				autoIndentAfterNewLine(command);
 			} else if (command.text.equals("}")) {//$NON-NLS-1$
 				autoIndentAfterClose(command, CSSRegionContexts.CSS_RBRACE);
 			} else if (command.text.equals("]")) {//$NON-NLS-1$
 				autoIndentAfterClose(command, CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END);
 			} else if (command.text.equals(")")) {//$NON-NLS-1$
 				autoIndentAfterClose(command, CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE);
 			}
 		}
 		// */

 		// spaces for tab character
 		if (command.text != null && command.text.length() > 0 && command.text.charAt(0) == '\t')
 			smartInsertForTab(command, document);
 	}

 	/**
 	 */
 	protected String getIndentFor(CompoundRegion region, boolean indentForNextRegion) {
 		if (region == null)
 			return null;
 		IStructuredDocumentRegion flatNode = region.getDocumentRegion();
 		if (flatNode == null)
 			return null;

 		try {
 			if (region.getType() == CSSRegionContexts.CSS_LBRACE || region.getType() == CSSRegionContexts.CSS_DELIMITER || region.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER) {
 				// get meanful flat node
 				RegionIterator it = new RegionIterator(flatNode, region.getTextRegion());
 				it.prev();
 				while (it.hasPrev()) {
 					ITextRegion r = it.prev();
 					region = new CompoundRegion(it.getStructuredDocumentRegion(), r);
 					if (region.getType() != CSSRegionContexts.CSS_S)
 						break;
 				}
 				flatNode = region.getDocumentRegion();
 				// get indent string
 				int position = flatNode.getStart();
 				int line = structuredDocument.getLineOfOffset(position);
 				int start = structuredDocument.getLineOffset(line);
 				int end = findEndOfWhiteSpace(structuredDocument, start, position);
 				return structuredDocument.get(start, end - start);
 			} else if (region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_START ||
 			// region.getType() == CSSRegionContexts.CSS_PARENTHESIS_OPEN ||
 						region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_FUNCTION || region.getType() == CSSRegionContexts.CSS_DECLARATION_SEPARATOR) {
 				int position = flatNode.getStart() + region.getStart();
 				int line = structuredDocument.getLineOfOffset(position);
 				int start = structuredDocument.getLineOffset(line);
 				int end = findEndOfWhiteSpace(structuredDocument, start, position);
 				StringBuffer buf = new StringBuffer(structuredDocument.get(start, end - start));
 				position += region.getText().length();
 				if (indentForNextRegion) {
 					int tokenStart = findEndOfWhiteSpace(structuredDocument, position, structuredDocument.getLineOffset(line) + structuredDocument.getLineLength(line) - 1);
 					if (tokenStart < structuredDocument.getLineOffset(line) + structuredDocument.getLineLength(line) - 1) {
 						position = tokenStart;
 					}
 				}
 				while (position - end > 0) {
 					buf.append(" ");//$NON-NLS-1$
 					end++;
 				}
 				return buf.toString();
 			} else
 				return "";//$NON-NLS-1$
 		} catch (BadLocationException excp) {
 			Logger.logException(excp);
 		}
 		return null;
 	}

 	/**
 	 */
 	protected CompoundRegion getPrevKeyRegion(int position, CompoundRegion currentRegion) {
 		if (currentRegion == null) {
 			if (structuredDocument.getLastStructuredDocumentRegion() == null)
 				return null;
 		}

 		if (currentRegion != null && (currentRegion.getType() == CSSRegionContexts.CSS_RBRACE || currentRegion.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END || currentRegion.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE)) {
 			return prevCorrespondence(currentRegion);
 		}

 		RegionIterator it = new RegionIterator(structuredDocument, position - 1);
 		while (it.hasPrev()) {
 			ITextRegion r = it.prev();
 			CompoundRegion region = new CompoundRegion(it.getStructuredDocumentRegion(), r);
 			if (region.getType() == CSSRegionContexts.CSS_LBRACE ||
 			// region.getType() == CSSRegionContexts.CSS_RBRACE ||
 						region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_START ||
 						// region.getType() ==
 						// CSSRegionContexts.CSS_BRACKET_CLOSE ||
 						// // region.getType() ==
 						// CSSRegionContexts.CSS_PARENTHESIS_OPEN ||
 						// region.getType() ==
 						// CSSRegionContexts.CSS_PARENTHESIS_CLOSE ||
 						region.getType() == CSSRegionContexts.CSS_DELIMITER || region.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER ||
 						// region.getType() == CSSRegionContexts.CSS_COLON ||
 						// region.getType() == CSSRegionContexts.CSS_COMMENT
 						// ||
 						region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_FUNCTION) {
 				return region;
 			} else if (region.getType() == CSSRegionContexts.CSS_RBRACE || region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END || region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE) {
 				// skip to LBRACE
 				CompoundRegion pc = prevCorrespondence(region);
 				// guard for NPE
 				//https://bugs.eclipse.org/bugs/show_bug.cgi?id=111318
 				if (pc == null) break;
 				it.reset(pc.getDocumentRegion(), pc.getTextRegion());
 				it.prev();
 			} else if (region.getType() == CSSRegionContexts.CSS_STRING) {
 				RegionIterator itTmp = new RegionIterator(structuredDocument, position);
 				if (region == itTmp.prev())
 					return region; // position is inside of string
 			} else if (region.getType() == CSSRegionContexts.CSS_COMMENT) {
 				RegionIterator itTmp = new RegionIterator(structuredDocument, position);
 				if (region == itTmp.prev())
 					return region; // position is inside of comment
 			} else if (region.getType() == CSSRegionContexts.CSS_UNKNOWN) {
 				String str = region.getText();
 				if (str.charAt(str.length() - 1) == '\\')
 					return region;
 			} else if (region.getType() == CSSRegionContexts.CSS_DECLARATION_SEPARATOR) {
 				RegionIterator itPrev = new RegionIterator(region.getDocumentRegion(), region.getTextRegion());
 				while (itPrev.hasPrev()) {
 					ITextRegion regionPrev = itPrev.prev();
 					if (regionPrev.getType() == CSSRegionContexts.CSS_RBRACE) {
 						break;
 					} else if (regionPrev.getType() == CSSRegionContexts.CSS_DELIMITER || regionPrev.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER) {
 						return region;
 					} else if (regionPrev.getType() == CSSRegionContexts.CSS_LBRACE) {
 						while (itPrev.hasPrev()) {
 							regionPrev = itPrev.prev();
 							if (regionPrev.getType() == CSSRegionContexts.CSS_MEDIA)
 								break;
 							if (regionPrev.getType() == CSSRegionContexts.CSS_LBRACE || regionPrev.getType() == CSSRegionContexts.CSS_RBRACE || regionPrev.getType() == CSSRegionContexts.CSS_DELIMITER || regionPrev.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER)
 								return region;
 						}
 						if (regionPrev.getType() == CSSRegionContexts.CSS_MEDIA)
 							break;
 						else
 							return region;
 					}
 				}
 			}
 		}
 		return null;
 	}

 	/**
 	 */
 	protected CompoundRegion getRegion(int position) {
 		IStructuredDocumentRegion flatNode = structuredDocument.getRegionAtCharacterOffset(position);
 		if (flatNode != null)
 			return new CompoundRegion(flatNode, flatNode.getRegionAtCharacterOffset(position));
 		return null;
 	}

 	/**
 	 */
 	protected int needShift(CompoundRegion region, int position) {
 		int shift = 0;
 		if (region == null || region.getType() == CSSRegionContexts.CSS_DELIMITER || region.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER || region.getType() == CSSRegionContexts.CSS_LBRACE) {
 			// get non space region
 			CompoundRegion cr = getRegion(position - 1);
 			RegionIterator it = new RegionIterator(cr.getDocumentRegion(), cr.getTextRegion());
 			ITextRegion nearestRegion = null;
 			while (it.hasPrev()) {
 				nearestRegion = it.prev();
 				if (nearestRegion.getType() != CSSRegionContexts.CSS_S && nearestRegion.getType() != CSSRegionContexts.CSS_COMMENT)
 					break;
 			}
 			if (nearestRegion != null && (nearestRegion.getType() == CSSRegionContexts.CSS_LBRACE || nearestRegion.getType() == CSSRegionContexts.CSS_RBRACE || nearestRegion.getType() == CSSRegionContexts.CSS_DELIMITER || nearestRegion.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER))
 				shift--;
 			else if (region == null)
 				shift--;
 			shift++;
 		}
 		if (region != null && region.getType() == CSSRegionContexts.CSS_LBRACE) {
 			RegionIterator it = new RegionIterator(structuredDocument, position);
 			if (!it.hasPrev() || it.prev().getType() != CSSRegionContexts.CSS_RBRACE)
 				shift++;
 			else
 				shift = 0;
 		}
 		return shift;
 	}

 	/**
 	 */
 	protected CompoundRegion prevCorrespondence(int position, String regionType) {
 		RegionIterator it = new RegionIterator(structuredDocument, position - 1);
 		ITextRegion region = null;
 		int nest = 1;
 		if (regionType == CSSRegionContexts.CSS_RBRACE) {
 			// skip to LBRACE
 			while (it.hasPrev()) {
 				region = it.prev();
 				if (region.getType() == CSSRegionContexts.CSS_LBRACE)
 					nest--;
 				else if (region.getType() == CSSRegionContexts.CSS_RBRACE)
 					nest++;
 				if (nest <= 0)
 					break;
 			}
 			if (nest == 0)
 				return new CompoundRegion(it.getStructuredDocumentRegion(), region);
 		}
 		if (regionType == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END) {
 			// skip to BRACKET_OPEN
 			while (it.hasPrev()) {
 				region = it.prev();
 				if (region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_START)
 					nest--;
 				else if (region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END)
 					nest++;
 				if (nest <= 0)
 					break;
 			}
 			if (nest == 0)
 				return new CompoundRegion(it.getStructuredDocumentRegion(), region);
 		}
 		if (regionType == CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE) {
 			// skip to PARENTHESIS_OPEN
 			while (it.hasPrev()) {
 				region = it.prev();
 				if (// region.getType() ==
 				// CSSRegionContexts.CSS_PARENTHESIS_OPEN ||
 				region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_FUNCTION)
 					nest--;
 				else if (region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE)
 					nest++;
 				if (nest <= 0)
 					break;
 			}
 			if (nest == 0)
 				return new CompoundRegion(it.getStructuredDocumentRegion(), region);
 		}
 		return null;
 	}

 	/**
 	 */
 	protected CompoundRegion prevCorrespondence(CompoundRegion region) {
 		if (region == null)
 			return null;

 		IStructuredDocumentRegion flatNode = region.getDocumentRegion();
 		int position = flatNode.getStart() + region.getStart();
 		return prevCorrespondence(position, region.getType());
 	}

 	/**
 	 * Insert the method's description here.
 	 *
 	 * @return boolean
 	 * @param command
 	 *            org.eclipse.jface.text.DocumentCommand
 	 */
 	protected boolean setRangeForClose(DocumentCommand command) {
 		int position = command.offset;

 		if (position == -1 || structuredDocument.getLength() == 0) {
 			return false;
 		}

 		try {
 			// find start of line
 			int p = (position == structuredDocument.getLength() ? position - 1 : position);

 			int line = structuredDocument.getLineOfOffset(p);
 			int start = structuredDocument.getLineOffset(line);
 			RegionIterator it = new RegionIterator(structuredDocument, start);
 			boolean allWhiteSpace = false;
 			// check whether the text from lStart to position is white space
 			// or not
 			while (it.hasNext()) {
 				ITextRegion region = it.next();
 				if (region.getType() != CSSRegionContexts.CSS_S)
 					break;
 				if (it.getStructuredDocumentRegion().getEndOffset(region) > p) {
 					allWhiteSpace = true;
 					break;
 				}
 			}
 			if (allWhiteSpace) {
 				command.length = command.length - (start - command.offset);
 				command.offset = start;
 				return true;
 			}
 		} catch (BadLocationException excp) {
 			Logger.logException(excp);
 		}
 		return false;
 	}

 	/**
 	 */
 	protected void setRangeForNewLine(DocumentCommand command) {
 		int position = command.offset;

 		if (position == -1 || structuredDocument.getLength() == 0) {
 			return;
 		}

 		try {
 			// add pre-nearest white spaces to replace target
 			if (position > 0) {
 				IStructuredDocumentRegion flatNode = structuredDocument.getRegionAtCharacterOffset(position - 1);
 				if (flatNode != null) {
 					ITextRegion region = flatNode.getRegionAtCharacterOffset(position - 1);
 					if (region.getType() == CSSRegionContexts.CSS_S) {
 						int end = command.offset + command.length;
 						int nLine = structuredDocument.getLineOfOffset(position);
 						int nStartPos = structuredDocument.getLineOffset(nLine);
 						if (nStartPos < flatNode.getStartOffset(region))
 							nStartPos = flatNode.getStartOffset(region);
 						command.offset = nStartPos;
 						command.length = end - command.offset;
 					}
 				}
 			}

 			// add post-nearest white spaces to replace target
 			if (position < structuredDocument.getLength()) {
 				IStructuredDocumentRegion flatNode = structuredDocument.getRegionAtCharacterOffset(position);
 				if (flatNode != null) {
 					ITextRegion region = flatNode.getRegionAtCharacterOffset(position);
 					if (region.getType() == CSSRegionContexts.CSS_S) {
 						int nLine = structuredDocument.getLineOfOffset(position);
 						String currentLineDelim = structuredDocument.getLineDelimiter(nLine);
 						int nEndPos = structuredDocument.getLineOffset(nLine) + structuredDocument.getLineLength(nLine) - ((currentLineDelim != null) ? currentLineDelim.length() : 0);
 						if (nEndPos > flatNode.getEndOffset(region))
 							nEndPos = flatNode.getEndOffset(region);
 						command.length = nEndPos - command.offset;
 					}
 				}
 			}
 		} catch (BadLocationException e) {
 			// do not customize command
 		}

 	}

 	private static int endsWith(String[] searchStrings, String text) {
 		for (int i = 0; i < searchStrings.length; i++) {
 			if (text.endsWith(searchStrings[i]))
 				return i;
 		}
 		return -1;
 	}

 	private static int findEndOfWhiteSpace(IDocument document, int offset, int end) throws BadLocationException {
 		while (offset < end) {
 			char c = document.getChar(offset);
 			if (c != ' ' && c != '\t') {
 				return offset;
 			}
 			offset++;
 		}
 		return end;
 	}


 	private String getIndentString() {
 		StringBuffer indent = new StringBuffer();

 		Preferences preferences = CSSCorePlugin.getDefault().getPluginPreferences();
 		if (preferences != null) {
 			char indentChar = ' ';
 			String indentCharPref = preferences.getString(CSSCorePreferenceNames.INDENTATION_CHAR);
 			if (CSSCorePreferenceNames.TAB.equals(indentCharPref)) {
 				indentChar = '\t';
 			}
 			int indentationWidth = preferences.getInt(CSSCorePreferenceNames.INDENTATION_SIZE);

 			for (int i = 0; i < indentationWidth; i++) {
 				indent.append(indentChar);
 			}
 		}
 		return indent.toString();
 	}

 	/**
 	 * Return the active text editor if possible, otherwise the active editor
 	 * part.
 	 *
 	 * @return
 	 */
 	private Object getActiveTextEditor() {
 		IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
 		if (window != null) {
 			IWorkbenchPage page = window.getActivePage();
 			if (page != null) {
 				IEditorPart editor = page.getActiveEditor();
 				if (editor != null) {
 					if (editor instanceof ITextEditor)
 						return editor;
 					ITextEditor textEditor = (ITextEditor) editor.getAdapter(ITextEditor.class);
 					if (textEditor != null)
 						return textEditor;
 					return editor;
 				}
 			}
 		}
 		return null;
 	}

 	/**
 	 * Insert spaces for tabs
 	 *
 	 * @param command
 	 */
 	private void smartInsertForTab(DocumentCommand command, IDocument document) {
 		// tab key was pressed. now check preferences to see if need to insert
 		// spaces instead of tab
 		Preferences preferences = CSSCorePlugin.getDefault().getPluginPreferences();
 		if (CSSCorePreferenceNames.SPACE.equals(preferences.getString(CSSCorePreferenceNames.INDENTATION_CHAR))) {
 			int indentationWidth = preferences.getInt(CSSCorePreferenceNames.INDENTATION_SIZE);

 			StringBuffer indent = new StringBuffer();
 			if (indentationWidth != 0) {
 				int indentSize = indentationWidth;
 				try {
 					IRegion firstLine = document.getLineInformationOfOffset(command.offset);
 					int offsetInLine = command.offset - firstLine.getOffset();
 					int remainder = offsetInLine % indentationWidth;

 					indentSize = indentationWidth - remainder;
 				} catch (BadLocationException e) {
 					Logger.log(Logger.WARNING_DEBUG, e.getMessage(), e);
 				}

 				for (int i = 0; i < indentSize; i++)
 					indent.append(' ');
 			}

 			// replace \t characters with spaces
 			command.text = indent.toString();
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2004, 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.wst.css.ui.internal.autoedit;

	import org.eclipse.core.runtime.Preferences;
	import org.eclipse.jface.text.BadLocationException;
	import org.eclipse.jface.text.DocumentCommand;
	import org.eclipse.jface.text.IAutoEditStrategy;
	import org.eclipse.jface.text.IDocument;
	import org.eclipse.jface.text.IRegion;
	import org.eclipse.ui.IEditorPart;
	import org.eclipse.ui.IWorkbenchPage;
	import org.eclipse.ui.IWorkbenchWindow;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.texteditor.ITextEditor;
	import org.eclipse.ui.texteditor.ITextEditorExtension3;
	import org.eclipse.wst.css.core.internal.CSSCorePlugin;
	import org.eclipse.wst.css.core.internal.parserz.CSSRegionContexts;
	import org.eclipse.wst.css.core.internal.preferences.CSSCorePreferenceNames;
	import org.eclipse.wst.css.core.internal.util.RegionIterator;
	import org.eclipse.wst.css.ui.internal.Logger;
	import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument;
	import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion;
	import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion;

	public class StructuredAutoEditStrategyCSS implements IAutoEditStrategy {
	protected IStructuredDocument structuredDocument = null;

	class CompoundRegion {

	CompoundRegion(IStructuredDocumentRegion documentRegion, ITextRegion textRegion) {
	super();
	this.documentRegion = documentRegion;
	this.textRegion = textRegion;
	}

	IStructuredDocumentRegion getDocumentRegion() {
	return documentRegion;
	}

	ITextRegion getTextRegion() {
	return textRegion;
	}

	int getStart() {
	return textRegion.getStart();
	}

	int getEnd() {
	return textRegion.getEnd();
	}

	String getType() {
	return textRegion.getType();
	}

	String getText() {
	return documentRegion.getText(textRegion);
	}

	int getStartOffset() {
	return documentRegion.getStartOffset(textRegion);
	}

	int getEndOffset() {
	return documentRegion.getEndOffset(textRegion);
	}

	private IStructuredDocumentRegion documentRegion;
	private ITextRegion textRegion;

	}

	/**
	*/
	protected void autoIndentAfterClose(DocumentCommand command, String regionType) {
	if (!setRangeForClose(command))
	return;

	int position = command.offset + command.length;

	if (position == -1 \|\| structuredDocument.getLength() == 0) {
	return;
	}

	// get open brace region
	CompoundRegion region = prevCorrespondence(position, regionType);

	// get indentation
	String str = getIndentFor(region, false);

	// append to input
	if (str != null)
	command.text = str + command.text;
	}

	/**
	* Copies the indentation of the previous line.
	*/
	protected void autoIndentAfterNewLine(DocumentCommand command) {
	// select nearest white spaces to replace with new-line
	setRangeForNewLine(command);

	// get position
	int position = command.offset;

	if (position == -1 \|\| structuredDocument.getLength() == 0) {
	return;
	}

	// get current region
	CompoundRegion currentRegion = getRegion(command.offset + command.length);

	// get key region
	CompoundRegion keyRegion = getPrevKeyRegion(position, currentRegion);

	// get indent string
	String str = getIndentFor(keyRegion, true);

	// check another indentation
	int shift = needShift(keyRegion, command.offset + command.length);

	// create text to replace
	StringBuffer buf = new StringBuffer(command.text);
	if (str != null)
	buf.append(str);
	while (shift-- != 0)
	buf.append(getIndentString());
	command.text = buf.toString();

	}

	/**
	*/
	public void customizeDocumentCommand(IDocument document, DocumentCommand command) {
	Object textEditor = getActiveTextEditor();
	if (!(textEditor instanceof ITextEditorExtension3 && ((ITextEditorExtension3) textEditor).getInsertMode() == ITextEditorExtension3.SMART_INSERT))
	return;

	// return;
	// /*
	structuredDocument = (IStructuredDocument) document;

	if (command.length == 0 && command.text != null) {
	if (endsWith(document.getLegalLineDelimiters(), command.text) != -1) {
	autoIndentAfterNewLine(command);
	} else if (command.text.equals("}")) {//$NON-NLS-1$
	autoIndentAfterClose(command, CSSRegionContexts.CSS_RBRACE);
	} else if (command.text.equals("]")) {//$NON-NLS-1$
	autoIndentAfterClose(command, CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END);
	} else if (command.text.equals(")")) {//$NON-NLS-1$
	autoIndentAfterClose(command, CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE);
	}
	}
	// */

	// spaces for tab character
	if (command.text != null && command.text.length() > 0 && command.text.charAt(0) == '\t')
	smartInsertForTab(command, document);
	}

	/**
	*/
	protected String getIndentFor(CompoundRegion region, boolean indentForNextRegion) {
	if (region == null)
	return null;
	IStructuredDocumentRegion flatNode = region.getDocumentRegion();
	if (flatNode == null)
	return null;

	try {
	if (region.getType() == CSSRegionContexts.CSS_LBRACE \|\| region.getType() == CSSRegionContexts.CSS_DELIMITER \|\| region.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER) {
	// get meanful flat node
	RegionIterator it = new RegionIterator(flatNode, region.getTextRegion());
	it.prev();
	while (it.hasPrev()) {
	ITextRegion r = it.prev();
	region = new CompoundRegion(it.getStructuredDocumentRegion(), r);
	if (region.getType() != CSSRegionContexts.CSS_S)
	break;
	}
	flatNode = region.getDocumentRegion();
	// get indent string
	int position = flatNode.getStart();
	int line = structuredDocument.getLineOfOffset(position);
	int start = structuredDocument.getLineOffset(line);
	int end = findEndOfWhiteSpace(structuredDocument, start, position);
	return structuredDocument.get(start, end - start);
	} else if (region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_START \|\|
	// region.getType() == CSSRegionContexts.CSS_PARENTHESIS_OPEN \|\|
	region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_FUNCTION \|\| region.getType() == CSSRegionContexts.CSS_DECLARATION_SEPARATOR) {
	int position = flatNode.getStart() + region.getStart();
	int line = structuredDocument.getLineOfOffset(position);
	int start = structuredDocument.getLineOffset(line);
	int end = findEndOfWhiteSpace(structuredDocument, start, position);
	StringBuffer buf = new StringBuffer(structuredDocument.get(start, end - start));
	position += region.getText().length();
	if (indentForNextRegion) {
	int tokenStart = findEndOfWhiteSpace(structuredDocument, position, structuredDocument.getLineOffset(line) + structuredDocument.getLineLength(line) - 1);
	if (tokenStart < structuredDocument.getLineOffset(line) + structuredDocument.getLineLength(line) - 1) {
	position = tokenStart;
	}
	}
	while (position - end > 0) {
	buf.append(" ");//$NON-NLS-1$
	end++;
	}
	return buf.toString();
	} else
	return "";//$NON-NLS-1$
	} catch (BadLocationException excp) {
	Logger.logException(excp);
	}
	return null;
	}

	/**
	*/
	protected CompoundRegion getPrevKeyRegion(int position, CompoundRegion currentRegion) {
	if (currentRegion == null) {
	if (structuredDocument.getLastStructuredDocumentRegion() == null)
	return null;
	}

	if (currentRegion != null && (currentRegion.getType() == CSSRegionContexts.CSS_RBRACE \|\| currentRegion.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END \|\| currentRegion.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE)) {
	return prevCorrespondence(currentRegion);
	}

	RegionIterator it = new RegionIterator(structuredDocument, position - 1);
	while (it.hasPrev()) {
	ITextRegion r = it.prev();
	CompoundRegion region = new CompoundRegion(it.getStructuredDocumentRegion(), r);
	if (region.getType() == CSSRegionContexts.CSS_LBRACE \|\|
	// region.getType() == CSSRegionContexts.CSS_RBRACE \|\|
	region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_START \|\|
	// region.getType() ==
	// CSSRegionContexts.CSS_BRACKET_CLOSE \|\|
	// // region.getType() ==
	// CSSRegionContexts.CSS_PARENTHESIS_OPEN \|\|
	// region.getType() ==
	// CSSRegionContexts.CSS_PARENTHESIS_CLOSE \|\|
	region.getType() == CSSRegionContexts.CSS_DELIMITER \|\| region.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER \|\|
	// region.getType() == CSSRegionContexts.CSS_COLON \|\|
	// region.getType() == CSSRegionContexts.CSS_COMMENT
	// \|\|
	region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_FUNCTION) {
	return region;
	} else if (region.getType() == CSSRegionContexts.CSS_RBRACE \|\| region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END \|\| region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE) {
	// skip to LBRACE
	CompoundRegion pc = prevCorrespondence(region);
	// guard for NPE
	//https://bugs.eclipse.org/bugs/show_bug.cgi?id=111318
	if (pc == null) break;
	it.reset(pc.getDocumentRegion(), pc.getTextRegion());
	it.prev();
	} else if (region.getType() == CSSRegionContexts.CSS_STRING) {
	RegionIterator itTmp = new RegionIterator(structuredDocument, position);
	if (region == itTmp.prev())
	return region; // position is inside of string
	} else if (region.getType() == CSSRegionContexts.CSS_COMMENT) {
	RegionIterator itTmp = new RegionIterator(structuredDocument, position);
	if (region == itTmp.prev())
	return region; // position is inside of comment
	} else if (region.getType() == CSSRegionContexts.CSS_UNKNOWN) {
	String str = region.getText();
	if (str.charAt(str.length() - 1) == '\\')
	return region;
	} else if (region.getType() == CSSRegionContexts.CSS_DECLARATION_SEPARATOR) {
	RegionIterator itPrev = new RegionIterator(region.getDocumentRegion(), region.getTextRegion());
	while (itPrev.hasPrev()) {
	ITextRegion regionPrev = itPrev.prev();
	if (regionPrev.getType() == CSSRegionContexts.CSS_RBRACE) {
	break;
	} else if (regionPrev.getType() == CSSRegionContexts.CSS_DELIMITER \|\| regionPrev.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER) {
	return region;
	} else if (regionPrev.getType() == CSSRegionContexts.CSS_LBRACE) {
	while (itPrev.hasPrev()) {
	regionPrev = itPrev.prev();
	if (regionPrev.getType() == CSSRegionContexts.CSS_MEDIA)
	break;
	if (regionPrev.getType() == CSSRegionContexts.CSS_LBRACE \|\| regionPrev.getType() == CSSRegionContexts.CSS_RBRACE \|\| regionPrev.getType() == CSSRegionContexts.CSS_DELIMITER \|\| regionPrev.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER)
	return region;
	}
	if (regionPrev.getType() == CSSRegionContexts.CSS_MEDIA)
	break;
	else
	return region;
	}
	}
	}
	}
	return null;
	}

	/**
	*/
	protected CompoundRegion getRegion(int position) {
	IStructuredDocumentRegion flatNode = structuredDocument.getRegionAtCharacterOffset(position);
	if (flatNode != null)
	return new CompoundRegion(flatNode, flatNode.getRegionAtCharacterOffset(position));
	return null;
	}

	/**
	*/
	protected int needShift(CompoundRegion region, int position) {
	int shift = 0;
	if (region == null \|\| region.getType() == CSSRegionContexts.CSS_DELIMITER \|\| region.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER \|\| region.getType() == CSSRegionContexts.CSS_LBRACE) {
	// get non space region
	CompoundRegion cr = getRegion(position - 1);
	RegionIterator it = new RegionIterator(cr.getDocumentRegion(), cr.getTextRegion());
	ITextRegion nearestRegion = null;
	while (it.hasPrev()) {
	nearestRegion = it.prev();
	if (nearestRegion.getType() != CSSRegionContexts.CSS_S && nearestRegion.getType() != CSSRegionContexts.CSS_COMMENT)
	break;
	}
	if (nearestRegion != null && (nearestRegion.getType() == CSSRegionContexts.CSS_LBRACE \|\| nearestRegion.getType() == CSSRegionContexts.CSS_RBRACE \|\| nearestRegion.getType() == CSSRegionContexts.CSS_DELIMITER \|\| nearestRegion.getType() == CSSRegionContexts.CSS_DECLARATION_DELIMITER))
	shift--;
	else if (region == null)
	shift--;
	shift++;
	}
	if (region != null && region.getType() == CSSRegionContexts.CSS_LBRACE) {
	RegionIterator it = new RegionIterator(structuredDocument, position);
	if (!it.hasPrev() \|\| it.prev().getType() != CSSRegionContexts.CSS_RBRACE)
	shift++;
	else
	shift = 0;
	}
	return shift;
	}

	/**
	*/
	protected CompoundRegion prevCorrespondence(int position, String regionType) {
	RegionIterator it = new RegionIterator(structuredDocument, position - 1);
	ITextRegion region = null;
	int nest = 1;
	if (regionType == CSSRegionContexts.CSS_RBRACE) {
	// skip to LBRACE
	while (it.hasPrev()) {
	region = it.prev();
	if (region.getType() == CSSRegionContexts.CSS_LBRACE)
	nest--;
	else if (region.getType() == CSSRegionContexts.CSS_RBRACE)
	nest++;
	if (nest <= 0)
	break;
	}
	if (nest == 0)
	return new CompoundRegion(it.getStructuredDocumentRegion(), region);
	}
	if (regionType == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END) {
	// skip to BRACKET_OPEN
	while (it.hasPrev()) {
	region = it.prev();
	if (region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_START)
	nest--;
	else if (region.getType() == CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END)
	nest++;
	if (nest <= 0)
	break;
	}
	if (nest == 0)
	return new CompoundRegion(it.getStructuredDocumentRegion(), region);
	}
	if (regionType == CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE) {
	// skip to PARENTHESIS_OPEN
	while (it.hasPrev()) {
	region = it.prev();
	if (// region.getType() ==
	// CSSRegionContexts.CSS_PARENTHESIS_OPEN \|\|
	region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_FUNCTION)
	nest--;
	else if (region.getType() == CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE)
	nest++;
	if (nest <= 0)
	break;
	}
	if (nest == 0)
	return new CompoundRegion(it.getStructuredDocumentRegion(), region);
	}
	return null;
	}

	/**
	*/
	protected CompoundRegion prevCorrespondence(CompoundRegion region) {
	if (region == null)
	return null;

	IStructuredDocumentRegion flatNode = region.getDocumentRegion();
	int position = flatNode.getStart() + region.getStart();
	return prevCorrespondence(position, region.getType());
	}

	/**
	* Insert the method's description here.
	*
	* @return boolean
	* @param command
	* org.eclipse.jface.text.DocumentCommand
	*/
	protected boolean setRangeForClose(DocumentCommand command) {
	int position = command.offset;

	if (position == -1 \|\| structuredDocument.getLength() == 0) {
	return false;
	}

	try {
	// find start of line
	int p = (position == structuredDocument.getLength() ? position - 1 : position);

	int line = structuredDocument.getLineOfOffset(p);
	int start = structuredDocument.getLineOffset(line);
	RegionIterator it = new RegionIterator(structuredDocument, start);
	boolean allWhiteSpace = false;
	// check whether the text from lStart to position is white space
	// or not
	while (it.hasNext()) {
	ITextRegion region = it.next();
	if (region.getType() != CSSRegionContexts.CSS_S)
	break;
	if (it.getStructuredDocumentRegion().getEndOffset(region) > p) {
	allWhiteSpace = true;
	break;
	}
	}
	if (allWhiteSpace) {
	command.length = command.length - (start - command.offset);
	command.offset = start;
	return true;
	}
	} catch (BadLocationException excp) {
	Logger.logException(excp);
	}
	return false;
	}

	/**
	*/
	protected void setRangeForNewLine(DocumentCommand command) {
	int position = command.offset;

	if (position == -1 \|\| structuredDocument.getLength() == 0) {
	return;
	}

	try {
	// add pre-nearest white spaces to replace target
	if (position > 0) {
	IStructuredDocumentRegion flatNode = structuredDocument.getRegionAtCharacterOffset(position - 1);
	if (flatNode != null) {
	ITextRegion region = flatNode.getRegionAtCharacterOffset(position - 1);
	if (region.getType() == CSSRegionContexts.CSS_S) {
	int end = command.offset + command.length;
	int nLine = structuredDocument.getLineOfOffset(position);
	int nStartPos = structuredDocument.getLineOffset(nLine);
	if (nStartPos < flatNode.getStartOffset(region))
	nStartPos = flatNode.getStartOffset(region);
	command.offset = nStartPos;
	command.length = end - command.offset;
	}
	}
	}

	// add post-nearest white spaces to replace target
	if (position < structuredDocument.getLength()) {
	IStructuredDocumentRegion flatNode = structuredDocument.getRegionAtCharacterOffset(position);
	if (flatNode != null) {
	ITextRegion region = flatNode.getRegionAtCharacterOffset(position);
	if (region.getType() == CSSRegionContexts.CSS_S) {
	int nLine = structuredDocument.getLineOfOffset(position);
	String currentLineDelim = structuredDocument.getLineDelimiter(nLine);
	int nEndPos = structuredDocument.getLineOffset(nLine) + structuredDocument.getLineLength(nLine) - ((currentLineDelim != null) ? currentLineDelim.length() : 0);
	if (nEndPos > flatNode.getEndOffset(region))
	nEndPos = flatNode.getEndOffset(region);
	command.length = nEndPos - command.offset;
	}
	}
	}
	} catch (BadLocationException e) {
	// do not customize command
	}

	}

	private static int endsWith(String[] searchStrings, String text) {
	for (int i = 0; i < searchStrings.length; i++) {
	if (text.endsWith(searchStrings[i]))
	return i;
	}
	return -1;
	}

	private static int findEndOfWhiteSpace(IDocument document, int offset, int end) throws BadLocationException {
	while (offset < end) {
	char c = document.getChar(offset);
	if (c != ' ' && c != '\t') {
	return offset;
	}
	offset++;
	}
	return end;
	}


	private String getIndentString() {
	StringBuffer indent = new StringBuffer();

	Preferences preferences = CSSCorePlugin.getDefault().getPluginPreferences();
	if (preferences != null) {
	char indentChar = ' ';
	String indentCharPref = preferences.getString(CSSCorePreferenceNames.INDENTATION_CHAR);
	if (CSSCorePreferenceNames.TAB.equals(indentCharPref)) {
	indentChar = '\t';
	}
	int indentationWidth = preferences.getInt(CSSCorePreferenceNames.INDENTATION_SIZE);

	for (int i = 0; i < indentationWidth; i++) {
	indent.append(indentChar);
	}
	}
	return indent.toString();
	}

	/**
	* Return the active text editor if possible, otherwise the active editor
	* part.
	*
	* @return
	*/
	private Object getActiveTextEditor() {
	IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
	if (window != null) {
	IWorkbenchPage page = window.getActivePage();
	if (page != null) {
	IEditorPart editor = page.getActiveEditor();
	if (editor != null) {
	if (editor instanceof ITextEditor)
	return editor;
	ITextEditor textEditor = (ITextEditor) editor.getAdapter(ITextEditor.class);
	if (textEditor != null)
	return textEditor;
	return editor;
	}
	}
	}
	return null;
	}

	/**
	* Insert spaces for tabs
	*
	* @param command
	*/
	private void smartInsertForTab(DocumentCommand command, IDocument document) {
	// tab key was pressed. now check preferences to see if need to insert
	// spaces instead of tab
	Preferences preferences = CSSCorePlugin.getDefault().getPluginPreferences();
	if (CSSCorePreferenceNames.SPACE.equals(preferences.getString(CSSCorePreferenceNames.INDENTATION_CHAR))) {
	int indentationWidth = preferences.getInt(CSSCorePreferenceNames.INDENTATION_SIZE);

	StringBuffer indent = new StringBuffer();
	if (indentationWidth != 0) {
	int indentSize = indentationWidth;
	try {
	IRegion firstLine = document.getLineInformationOfOffset(command.offset);
	int offsetInLine = command.offset - firstLine.getOffset();
	int remainder = offsetInLine % indentationWidth;

	indentSize = indentationWidth - remainder;
	} catch (BadLocationException e) {
	Logger.log(Logger.WARNING_DEBUG, e.getMessage(), e);
	}

	for (int i = 0; i < indentSize; i++)
	indent.append(' ');
	}

	// replace \t characters with spaces
	command.text = indent.toString();
	}
	}
	}