Java Code Examples for org.eclipse.jdt.core.compiler.IScanner#getCurrentTokenStartPosition()

private int getSurroundingComment(IScanner scanner) {
	try {
		int start= fLocation.getOffset();
		int end= start + fLocation.getLength();

		int token= scanner.getNextToken();
		while (token != ITerminalSymbols.TokenNameEOF) {
			if (TokenScanner.isComment(token)) {
				int currStart= scanner.getCurrentTokenStartPosition();
				int currEnd= scanner.getCurrentTokenEndPosition() + 1;
				if (currStart <= start && end <= currEnd) {
					return token;
				}
			}
			token= scanner.getNextToken();
		}

	} catch (InvalidInputException e) {
		// ignore
	}
	return ITerminalSymbols.TokenNameEOF;
}
 

/**
 * Creates a token comparator for the given string.
 *
 * @param text the text to be tokenized
 * @param textTokenComparatorFactory a factory to create text token comparators
 */
public SJavaTokenComparator(String text) {


  fText= text;

  int length= fText.length();
  fStarts= new int[length];
  fLengths= new int[length];
  fTokens= new String[length];
  fCount= 0;

  IScanner scanner= ToolFactory.createScanner(true, false, false, false); // returns comments & whitespace
  scanner.setSource(fText.toCharArray());
  int endPos= 0;
  try {
    int tokenType;
    while ((tokenType= scanner.getNextToken()) != ITerminalSymbols.TokenNameEOF) {
      int start= scanner.getCurrentTokenStartPosition();
      int end= scanner.getCurrentTokenEndPosition()+1;
      // Comments are treated as a single token (see bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=78063)
      if (!TokenScanner.isComment(tokenType)) {
        recordTokenRange(start, end - start);
      }
      endPos= end;
    }
  } catch (InvalidInputException ex) {
    // We couldn't parse part of the input. Fall through and make the rest a single token
  }
  // Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=13907
  if (endPos < length) {
    recordTokenRange(endPos, length - endPos);
  }
}
 

/**
 * A visitor that maps a selection to a given ASTNode. The result node is
 * determined as follows:
 * <ul>
 *   <li>first the visitor tries to find a node that is covered by <code>start</code> and
 *       <code>length</code> where either <code>start</code> and <code>length</code> exactly
 *       matches the node or where the text covered before and after the node only consists
 *       of white spaces or comments.</li>
 * 	 <li>if no such node exists than the node that encloses the range defined by
 *       start and end is returned.</li>
 *   <li>if the length is zero than also nodes are considered where the node's
 *       start or end position matches <code>start</code>.</li>
 *   <li>otherwise <code>null</code> is returned.</li>
 * </ul>
 *
 * @param root the root node from which the search starts
 * @param start the start offset
 * @param length the length
 * @param source the source of the compilation unit
 *
 * @return the result node
 * @throws JavaModelException if an error occurs in the Java model
 *
 * @since		3.0
 */
public static ASTNode perform(ASTNode root, int start, int length, ITypeRoot source) throws JavaModelException {
	NodeFinder finder= new NodeFinder(start, length);
	root.accept(finder);
	ASTNode result= finder.getCoveredNode();
	if (result == null)
		return null;
	Selection selection= Selection.createFromStartLength(start, length);
	if (selection.covers(result)) {
		IBuffer buffer= source.getBuffer();
		if (buffer != null) {
			IScanner scanner= ToolFactory.createScanner(false, false, false, false);
			scanner.setSource(buffer.getText(start, length).toCharArray());
			try {
				int token= scanner.getNextToken();
				if (token != ITerminalSymbols.TokenNameEOF) {
					int tStart= scanner.getCurrentTokenStartPosition();
					if (tStart == result.getStartPosition() - start) {
						scanner.resetTo(tStart + result.getLength(), length - 1);
						token= scanner.getNextToken();
						if (token == ITerminalSymbols.TokenNameEOF)
							return result;
					}
				}
			} catch (InvalidInputException e) {
			}
		}
	}
	return finder.getCoveringNode();
}
 

private static int firstOpeningBraceOffset(IInitializer iInitializer) throws JavaModelException {
	try {
		IScanner scanner= ToolFactory.createScanner(false, false, false, false);
		scanner.setSource(iInitializer.getSource().toCharArray());
		int token= scanner.getNextToken();
		while (token != ITerminalSymbols.TokenNameEOF && token != ITerminalSymbols.TokenNameLBRACE)
			token= scanner.getNextToken();
		if (token == ITerminalSymbols.TokenNameLBRACE)
			return iInitializer.getSourceRange().getOffset() + scanner.getCurrentTokenStartPosition() + scanner.getRawTokenSource().length;
		return iInitializer.getSourceRange().getOffset();
	} catch (InvalidInputException e) {
		return iInitializer.getSourceRange().getOffset();
	}
}
 

/**
 * Creates a token comparator for the given string.
 *
 * @param text the text to be tokenized
 */
public JavaTokenComparator(String text) {
	Assert.isLegal(text != null);

	fText= text;

	int length= fText.length();
	fStarts= new int[length];
	fLengths= new int[length];
	fCount= 0;

	IScanner scanner= ToolFactory.createScanner(true, true, false, false); // returns comments & whitespace
	scanner.setSource(fText.toCharArray());
	int endPos= 0;
	try {
		int tokenType;
		while ((tokenType= scanner.getNextToken()) != ITerminalSymbols.TokenNameEOF) {
			int start= scanner.getCurrentTokenStartPosition();
			int end= scanner.getCurrentTokenEndPosition()+1;
			// Comments and strings should not be treated as a single token, see https://bugs.eclipse.org/78063
			if (TokenScanner.isComment(tokenType) || tokenType == ITerminalSymbols.TokenNameStringLiteral) {
				// Line comments are often commented code, so lets treat them as code. See https://bugs.eclipse.org/216707
				boolean parseAsJava= tokenType == ITerminalSymbols.TokenNameCOMMENT_LINE;
				int dl= parseAsJava ? getCommentStartTokenLength(tokenType) : 0;
				if (dl > 0)
					recordTokenRange(start, dl);
				parseSubrange(start + dl, text.substring(start + dl, end), parseAsJava);
			} else {
				recordTokenRange(start, end - start);
			}
			endPos= end;
		}
	} catch (InvalidInputException ex) {
		// We couldn't parse part of the input. Fall through and make the rest a single token
	}
	// Workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=13907
	if (endPos < length) {
		recordTokenRange(endPos, length - endPos);
	}
}
 

@Override
public void acceptSearchMatch(ICompilationUnit unit, SearchMatch match) throws CoreException {
	if (match instanceof MethodReferenceMatch
			&& ((MethodReferenceMatch) match).isSuperInvocation()
			&& match.getAccuracy() == SearchMatch.A_INACCURATE) {
		return; // see https://bugs.eclipse.org/bugs/show_bug.cgi?id=156491
	}

	if (match.isImplicit()) { // see bug 94062
		collectMatch(match);
		return;
	}

	int start= match.getOffset();
	int length= match.getLength();
	String matchText= unit.getBuffer().getText(start, length);

	//direct match:
	if (fName.equals(matchText)) {
		collectMatch(match);
		return;
	}

	// lambda expression
	if (match instanceof MethodDeclarationMatch
			&& match.getElement() instanceof IMethod
			&& ((IMethod) match.getElement()).isLambdaMethod()) {
		// don't touch the lambda
		return;
	}

	//Not a standard reference -- use scanner to find last identifier token before left parenthesis:
	IScanner scanner= getScanner(unit);
	scanner.setSource(matchText.toCharArray());
	int simpleNameStart= -1;
	int simpleNameEnd= -1;
	try {
		int token = scanner.getNextToken();
		while (token != ITerminalSymbols.TokenNameEOF && token != ITerminalSymbols.TokenNameLPAREN) { // reference in code includes arguments in parentheses
			if (token == InternalTokenNameIdentifier) {
				simpleNameStart= scanner.getCurrentTokenStartPosition();
				simpleNameEnd= scanner.getCurrentTokenEndPosition();
			}
			token = scanner.getNextToken();
		}
	} catch (InvalidInputException e){
		//ignore
	}
	if (simpleNameStart != -1) {
		match.setOffset(start + simpleNameStart);
		match.setLength(simpleNameEnd + 1 - simpleNameStart);
	}
	collectMatch(match);
}
 

public SearchMatch acceptSearchMatch2(ICompilationUnit unit, SearchMatch match) throws CoreException {
	int start= match.getOffset();
	int length= match.getLength();

	//unqualified:
	String matchText= unit.getBuffer().getText(start, length);
	if (fOldName.equals(matchText)) {
		return match;
	}

	//(partially) qualified:
	if (fOldQualifiedName.endsWith(matchText)) {
		//e.g. rename B and p.A.B ends with match A.B
		int simpleNameLenght= fOldName.length();
		match.setOffset(start + length - simpleNameLenght);
		match.setLength(simpleNameLenght);
		return match;
	}

	//Not a standard reference -- use scanner to find last identifier token:
	IScanner scanner= getScanner(unit);
	scanner.setSource(matchText.toCharArray());
	int simpleNameStart= -1;
	int simpleNameEnd= -1;
	try {
		int token = scanner.getNextToken();
		while (token != ITerminalSymbols.TokenNameEOF) {
			if (token == ITerminalSymbols.TokenNameIdentifier) { // type reference can occur in module-info.java and collide with a restricted keyword.
				simpleNameStart= scanner.getCurrentTokenStartPosition();
				simpleNameEnd= scanner.getCurrentTokenEndPosition();
			}
			token = scanner.getNextToken();
		}
	} catch (InvalidInputException e){
		//ignore
	}
	if (simpleNameStart != -1) {
		match.setOffset(start + simpleNameStart);
		match.setLength(simpleNameEnd + 1 - simpleNameStart);
	}
	return match;
}
 

private void computeFoldingRanges(List<FoldingRange> foldingRanges, ITypeRoot unit, IProgressMonitor monitor) {
	try {
		ISourceRange range = unit.getSourceRange();
		if (!SourceRange.isAvailable(range)) {
			return;
		}

		String contents = unit.getSource();
		if (StringUtils.isBlank(contents)) {
			return;
		}

		final int shift = range.getOffset();
		IScanner scanner = getScanner();
		scanner.setSource(contents.toCharArray());
		scanner.resetTo(shift, shift + range.getLength());

		int start = shift;
		int token = 0;
		Stack<Integer> regionStarts = new Stack<>();
		while (token != ITerminalSymbols.TokenNameEOF) {
			start = scanner.getCurrentTokenStartPosition();
			switch (token) {
				case ITerminalSymbols.TokenNameCOMMENT_JAVADOC:
				case ITerminalSymbols.TokenNameCOMMENT_BLOCK:
					int end = scanner.getCurrentTokenEndPosition();
					FoldingRange commentFoldingRange = new FoldingRange(scanner.getLineNumber(start) - 1, scanner.getLineNumber(end) - 1);
					commentFoldingRange.setKind(FoldingRangeKind.Comment);
					foldingRanges.add(commentFoldingRange);
					break;
				case ITerminalSymbols.TokenNameCOMMENT_LINE:
					String currentSource = String.valueOf(scanner.getCurrentTokenSource());
					if (REGION_START_PATTERN.matcher(currentSource).lookingAt()) {
						regionStarts.push(start);
					} else if (REGION_END_PATTERN.matcher(currentSource).lookingAt()) {
						if (regionStarts.size() > 0) {
							FoldingRange regionFolding = new FoldingRange(scanner.getLineNumber(regionStarts.pop()) - 1, scanner.getLineNumber(start) - 1);
							regionFolding.setKind(FoldingRangeKind.Region);
							foldingRanges.add(regionFolding);
						}
					}
					break;
				default:
					break;
			}
			token = getNextToken(scanner);
		}
		computeTypeRootRanges(foldingRanges, unit, scanner);
	} catch (CoreException e) {
		JavaLanguageServerPlugin.logException("Problem with folding range for " + unit.getPath().toPortableString(), e);
		monitor.setCanceled(true);
	}
}
 

@Override
public void acceptSearchMatch(ICompilationUnit unit, SearchMatch match) throws CoreException {
	if (match instanceof MethodReferenceMatch
			&& ((MethodReferenceMatch) match).isSuperInvocation()
			&& match.getAccuracy() == SearchMatch.A_INACCURATE) {
		return; // see https://bugs.eclipse.org/bugs/show_bug.cgi?id=156491
	}

	if (match.isImplicit()) { // see bug 94062
		collectMatch(match);
		return;
	}

	int start= match.getOffset();
	int length= match.getLength();
	String matchText= unit.getBuffer().getText(start, length);

	//direct match:
	if (fName.equals(matchText)) {
		collectMatch(match);
		return;
	}

	// lambda expression
	if (match instanceof MethodDeclarationMatch
			&& match.getElement() instanceof IMethod
			&& ((IMethod) match.getElement()).isLambdaMethod()) {
		// don't touch the lambda
		return;
	}

	//Not a standard reference -- use scanner to find last identifier token before left parenthesis:
	IScanner scanner= getScanner(unit);
	scanner.setSource(matchText.toCharArray());
	int simpleNameStart= -1;
	int simpleNameEnd= -1;
	try {
		int token = scanner.getNextToken();
		while (token != ITerminalSymbols.TokenNameEOF && token != ITerminalSymbols.TokenNameLPAREN) { // reference in code includes arguments in parentheses
			if (token == ITerminalSymbols.TokenNameIdentifier) {
				simpleNameStart= scanner.getCurrentTokenStartPosition();
				simpleNameEnd= scanner.getCurrentTokenEndPosition();
			}
			token = scanner.getNextToken();
		}
	} catch (InvalidInputException e){
		//ignore
	}
	if (simpleNameStart != -1) {
		match.setOffset(start + simpleNameStart);
		match.setLength(simpleNameEnd + 1 - simpleNameStart);
	}
	collectMatch(match);
}
 

public SearchMatch acceptSearchMatch2(ICompilationUnit unit, SearchMatch match) throws CoreException {
	int start= match.getOffset();
	int length= match.getLength();

	//unqualified:
	String matchText= unit.getBuffer().getText(start, length);
	if (fOldName.equals(matchText)) {
		return match;
	}

	//(partially) qualified:
	if (fOldQualifiedName.endsWith(matchText)) {
		//e.g. rename B and p.A.B ends with match A.B
		int simpleNameLenght= fOldName.length();
		match.setOffset(start + length - simpleNameLenght);
		match.setLength(simpleNameLenght);
		return match;
	}

	//Not a standard reference -- use scanner to find last identifier token:
	IScanner scanner= getScanner(unit);
	scanner.setSource(matchText.toCharArray());
	int simpleNameStart= -1;
	int simpleNameEnd= -1;
	try {
		int token = scanner.getNextToken();
		while (token != ITerminalSymbols.TokenNameEOF) {
			if (token == ITerminalSymbols.TokenNameIdentifier) {
				simpleNameStart= scanner.getCurrentTokenStartPosition();
				simpleNameEnd= scanner.getCurrentTokenEndPosition();
			}
			token = scanner.getNextToken();
		}
	} catch (InvalidInputException e){
		//ignore
	}
	if (simpleNameStart != -1) {
		match.setOffset(start + simpleNameStart);
		match.setLength(simpleNameEnd + 1 - simpleNameStart);
	}
	return match;
}
 

private boolean checkStart(IScanner scanner, int position) {
	return scanner.getCurrentTokenStartPosition() < position && position <= scanner.getCurrentTokenEndPosition();
}
 

private boolean checkEnd(IScanner scanner, int position) {
	return scanner.getCurrentTokenStartPosition() <= position && position < scanner.getCurrentTokenEndPosition();
}
 

/**
 * Finds the key defined by the given match. The assumption is that the key is the only argument
 * and it is a string literal i.e. quoted ("...") or a string constant i.e. 'static final
 * String' defined in the same class.
 * 
 * @param keyPositionResult reference parameter: will be filled with the position of the found
 *            key
 * @param enclosingElement enclosing java element
 * @return a string denoting the key, {@link #NO_KEY} if no key can be found and
 *         <code>null</code> otherwise
 * @throws CoreException if a problem occurs while accessing the <code>enclosingElement</code>
 */
private String findKey(Position keyPositionResult, IJavaElement enclosingElement) throws CoreException {
	ICompilationUnit unit= (ICompilationUnit)enclosingElement.getAncestor(IJavaElement.COMPILATION_UNIT);
	if (unit == null)
		return null;

	String source= unit.getSource();
	if (source == null)
		return null;

	IJavaProject javaProject= unit.getJavaProject();
	IScanner scanner= null;
	if (javaProject != null) {
		String complianceLevel= javaProject.getOption(JavaCore.COMPILER_COMPLIANCE, true);
		String sourceLevel= javaProject.getOption(JavaCore.COMPILER_SOURCE, true);
		scanner= ToolFactory.createScanner(false, false, false, sourceLevel, complianceLevel);
	} else {
		scanner= ToolFactory.createScanner(false, false, false, false);
	}
	scanner.setSource(source.toCharArray());
	scanner.resetTo(keyPositionResult.getOffset() + keyPositionResult.getLength(), source.length());

	try {
		if (scanner.getNextToken() != ITerminalSymbols.TokenNameDOT)
			return null;

		if (scanner.getNextToken() != ITerminalSymbols.TokenNameIdentifier)
			return null;

		String src= new String(scanner.getCurrentTokenSource());
		int tokenStart= scanner.getCurrentTokenStartPosition();
		int tokenEnd= scanner.getCurrentTokenEndPosition();

		if (scanner.getNextToken() == ITerminalSymbols.TokenNameLPAREN) {
			// Old school
			// next must be key string. Ignore methods which do not take a single String parameter (Bug 295040).
			int nextToken= scanner.getNextToken();
			if (nextToken != ITerminalSymbols.TokenNameStringLiteral && nextToken != ITerminalSymbols.TokenNameIdentifier)
				return null;

			tokenStart= scanner.getCurrentTokenStartPosition();
			tokenEnd= scanner.getCurrentTokenEndPosition();
			int token;
			while ((token= scanner.getNextToken()) == ITerminalSymbols.TokenNameDOT) {
				if ((nextToken= scanner.getNextToken()) != ITerminalSymbols.TokenNameIdentifier) {
						return null;
				}
				tokenStart= scanner.getCurrentTokenStartPosition();
				tokenEnd= scanner.getCurrentTokenEndPosition();
			}
			if (token != ITerminalSymbols.TokenNameRPAREN)
				return null;
			
			if (nextToken == ITerminalSymbols.TokenNameStringLiteral) {
				keyPositionResult.setOffset(tokenStart + 1);
				keyPositionResult.setLength(tokenEnd - tokenStart - 1);
				return source.substring(tokenStart + 1, tokenEnd);
			} else if (nextToken == ITerminalSymbols.TokenNameIdentifier) {
				keyPositionResult.setOffset(tokenStart);
				keyPositionResult.setLength(tokenEnd - tokenStart + 1);
				IType parentClass= (IType)enclosingElement.getAncestor(IJavaElement.TYPE);
				IField[] fields= parentClass.getFields();
				String identifier= source.substring(tokenStart, tokenEnd + 1);
				for (int i= 0; i < fields.length; i++) {
					if (fields[i].getElementName().equals(identifier)) {
						if (!Signature.getSignatureSimpleName(fields[i].getTypeSignature()).equals("String")) //$NON-NLS-1$
							return null;
						Object obj= fields[i].getConstant();
						return obj instanceof String ? ((String)obj).substring(1, ((String)obj).length() - 1) : NO_KEY;
					}
				}
			}
			return NO_KEY;
		} else {
			IJavaElement[] keys= unit.codeSelect(tokenStart, tokenEnd - tokenStart + 1);

			// an interface can't be a key
			if (keys.length == 1 && keys[0].getElementType() == IJavaElement.TYPE && ((IType) keys[0]).isInterface())
				return null;

			keyPositionResult.setOffset(tokenStart);
			keyPositionResult.setLength(tokenEnd - tokenStart + 1);
			return src;
		}
	} catch (InvalidInputException e) {
		throw new CoreException(JavaUIStatus.createError(IStatus.ERROR, e));
	}
}
 

private IRegion computeHeaderComment(FoldingStructureComputationContext ctx) throws JavaModelException {
	// search at most up to the first type
	ISourceRange range= ctx.getFirstType().getSourceRange();
	if (range == null)
		return null;
	int start= 0;
	int end= range.getOffset();


	/* code adapted from CommentFormattingStrategy:
	 * scan the header content up to the first type. Once a comment is
	 * found, accumulate any additional comments up to the stop condition.
	 * The stop condition is reaching a package declaration, import container,
	 * or the end of the input.
	 */
	IScanner scanner= ctx.getScanner();
	scanner.resetTo(start, end);

	int headerStart= -1;
	int headerEnd= -1;
	try {
		boolean foundComment= false;
		int terminal= scanner.getNextToken();
		while (terminal != ITerminalSymbols.TokenNameEOF && !(terminal == ITerminalSymbols.TokenNameclass || terminal == ITerminalSymbols.TokenNameinterface || terminal == ITerminalSymbols.TokenNameenum || (foundComment && (terminal == ITerminalSymbols.TokenNameimport || terminal == ITerminalSymbols.TokenNamepackage)))) {

			if (terminal == ITerminalSymbols.TokenNameCOMMENT_JAVADOC || terminal == ITerminalSymbols.TokenNameCOMMENT_BLOCK || terminal == ITerminalSymbols.TokenNameCOMMENT_LINE) {
				if (!foundComment)
					headerStart= scanner.getCurrentTokenStartPosition();
				headerEnd= scanner.getCurrentTokenEndPosition();
				foundComment= true;
			}
			terminal= scanner.getNextToken();
		}


	} catch (InvalidInputException ex) {
		return null;
	}

	if (headerEnd != -1) {
		return new Region(headerStart, headerEnd - headerStart);
	}
	return null;
}
 

public ISourceRange getJavadocRange() throws JavaModelException {
	ISourceRange range= getSourceRange();
	if (range == null) return null;
	IBuffer buf= null;
	if (isBinary()) {
		buf = getClassFile().getBuffer();
	} else {
		ICompilationUnit compilationUnit = getCompilationUnit();
		if (!compilationUnit.isConsistent()) {
			return null;
		}
		buf = compilationUnit.getBuffer();
	}
	final int start= range.getOffset();
	final int length= range.getLength();
	if (length > 0 && buf.getChar(start) == '/') {
		IScanner scanner= ToolFactory.createScanner(true, false, false, false);
		try {
			scanner.setSource(buf.getText(start, length).toCharArray());
			int docOffset= -1;
			int docEnd= -1;

			int terminal= scanner.getNextToken();
			loop: while (true) {
				switch(terminal) {
					case ITerminalSymbols.TokenNameCOMMENT_JAVADOC :
						docOffset= scanner.getCurrentTokenStartPosition();
						docEnd= scanner.getCurrentTokenEndPosition() + 1;
						terminal= scanner.getNextToken();
						break;
					case ITerminalSymbols.TokenNameCOMMENT_LINE :
					case ITerminalSymbols.TokenNameCOMMENT_BLOCK :
						terminal= scanner.getNextToken();
						continue loop;
					default :
						break loop;
				}
			}
			if (docOffset != -1) {
				return new SourceRange(docOffset + start, docEnd - docOffset);
			}
		} catch (InvalidInputException ex) {
			// try if there is inherited Javadoc
		} catch (IndexOutOfBoundsException e) {
			// https://bugs.eclipse.org/bugs/show_bug.cgi?id=305001
		}
	}
	return null;
}