| /******************************************************************************* |
| * Copyright (c) 2000, 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.jdt.internal.corext.refactoring.nls; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.Document; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| |
| import org.eclipse.jdt.core.ICompilationUnit; |
| import org.eclipse.jdt.core.JavaModelException; |
| import org.eclipse.jdt.core.ToolFactory; |
| import org.eclipse.jdt.core.compiler.IScanner; |
| import org.eclipse.jdt.core.compiler.ITerminalSymbols; |
| import org.eclipse.jdt.core.compiler.InvalidInputException; |
| |
| public class NLSScanner { |
| |
| //no instances |
| private NLSScanner() { |
| } |
| |
| /** |
| * Returns a list of NLSLines found in the compilation unit |
| */ |
| public static NLSLine[] scan(ICompilationUnit cu) throws JavaModelException, InvalidInputException { |
| return scan(cu.getBuffer().getCharacters()); |
| } |
| |
| /** |
| * Returns a list of NLSLines found in the string |
| */ |
| public static NLSLine[] scan(String s) throws InvalidInputException { |
| return scan(s.toCharArray()); |
| } |
| |
| private static NLSLine[] scan(char[] content) throws InvalidInputException { |
| List lines= new ArrayList(); |
| IScanner scanner= ToolFactory.createScanner(true, true, false, true); |
| scanner.setSource(content); |
| int token= scanner.getNextToken(); |
| int currentLineNr= -1; |
| int previousLineNr= -1; |
| NLSLine currentLine= null; |
| int nlsElementIndex= 0; |
| |
| while (token != ITerminalSymbols.TokenNameEOF) { |
| switch (token) { |
| case ITerminalSymbols.TokenNameStringLiteral: |
| currentLineNr= scanner.getLineNumber(scanner.getCurrentTokenStartPosition()); |
| if (currentLineNr != previousLineNr) { |
| currentLine= new NLSLine(currentLineNr - 1); |
| lines.add(currentLine); |
| previousLineNr= currentLineNr; |
| nlsElementIndex= 0; |
| } |
| String value= new String(scanner.getCurrentTokenSource()); |
| currentLine.add( |
| new NLSElement( |
| value, |
| scanner.getCurrentTokenStartPosition(), |
| scanner.getCurrentTokenEndPosition() + 1 - scanner.getCurrentTokenStartPosition(), |
| nlsElementIndex++, |
| false)); |
| break; |
| case ITerminalSymbols.TokenNameCOMMENT_LINE: |
| if (currentLineNr != scanner.getLineNumber(scanner.getCurrentTokenStartPosition())) |
| break; |
| |
| parseTags(currentLine, scanner); |
| break; |
| } |
| token= scanner.getNextToken(); |
| } |
| NLSLine[] result; |
| try { |
| result= (NLSLine[]) lines.toArray(new NLSLine[lines.size()]); |
| IDocument document= new Document(String.valueOf(scanner.getSource())); |
| for (int i= 0; i < result.length; i++) { |
| setTagPositions(document, result[i]); |
| } |
| } catch (BadLocationException exception) { |
| throw new InvalidInputException(); |
| } |
| return result; |
| } |
| |
| private static void parseTags(NLSLine line, IScanner scanner) { |
| String s= new String(scanner.getCurrentTokenSource()); |
| int pos= s.indexOf(NLSElement.TAG_PREFIX); |
| while (pos != -1) { |
| int start= pos + NLSElement.TAG_PREFIX_LENGTH; |
| int end= s.indexOf(NLSElement.TAG_POSTFIX, start); |
| if (end < 0) |
| return; //no error recovery |
| |
| String index= s.substring(start, end); |
| int i= 0; |
| try { |
| i= Integer.parseInt(index) - 1; // Tags are one based not zero based. |
| } catch (NumberFormatException e) { |
| return; //ignore the exception - no error recovery |
| } |
| if (line.exists(i)) { |
| NLSElement element= line.get(i); |
| element.setTagPosition(scanner.getCurrentTokenStartPosition() + pos, end - pos + 1); |
| } else { |
| return; //no error recovery |
| } |
| pos= s.indexOf(NLSElement.TAG_PREFIX, start); |
| } |
| } |
| |
| private static void setTagPositions(IDocument document, NLSLine line) throws BadLocationException { |
| IRegion info= document.getLineInformation(line.getLineNumber()); |
| int defaultValue= info.getOffset() + info.getLength(); |
| NLSElement[] elements= line.getElements(); |
| for (int i= 0; i < elements.length; i++) { |
| NLSElement element= elements[i]; |
| if (!element.hasTag()) { |
| element.setTagPosition(computeInsertOffset(elements, i, defaultValue), 0); |
| } |
| } |
| } |
| |
| private static int computeInsertOffset(NLSElement[] elements, int index, int defaultValue) { |
| NLSElement previousTagged= findPreviousTagged(index, elements); |
| if (previousTagged != null) |
| return previousTagged.getTagPosition().getOffset() + previousTagged.getTagPosition().getLength(); |
| NLSElement nextTagged= findNextTagged(index, elements); |
| if (nextTagged != null) |
| return nextTagged.getTagPosition().getOffset(); |
| return defaultValue; |
| } |
| |
| private static NLSElement findPreviousTagged(int startIndex, NLSElement[] elements){ |
| int i= startIndex - 1; |
| while (i >= 0){ |
| if (elements[i].hasTag()) |
| return elements[i]; |
| i--; |
| } |
| return null; |
| } |
| |
| private static NLSElement findNextTagged(int startIndex, NLSElement[] elements){ |
| int i= startIndex + 1; |
| while (i < elements.length){ |
| if (elements[i].hasTag()) |
| return elements[i]; |
| i++; |
| } |
| return null; |
| } |
| } |
| |