/*******************************************************************************
* Copyright (c) 2005, 2010 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:
* John Camelon - Initial API and implementation
* Markus Schorn (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser;
import org.eclipse.cdt.core.dom.ast.ASTNodeProperty;
import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.ExpansionOverlapsBoundaryException;
import org.eclipse.cdt.core.dom.ast.IASTFileLocation;
import org.eclipse.cdt.core.dom.ast.IASTImageLocation;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTNodeLocation;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunction;
import org.eclipse.cdt.core.parser.IToken;
import org.eclipse.cdt.core.parser.OffsetLimitReachedException;
import org.eclipse.cdt.core.parser.util.CharArrayUtils;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPFunction;
import org.eclipse.cdt.internal.core.parser.scanner.ILexerLog;
import org.eclipse.cdt.internal.core.parser.scanner.ILocationResolver;
import org.eclipse.cdt.internal.core.parser.scanner.Lexer;
import org.eclipse.cdt.internal.core.parser.scanner.Token;
import org.eclipse.cdt.internal.core.parser.scanner.Lexer.LexerOptions;
/**
* Base class for all non-preprocessor nodes in the AST.
*/
public abstract class ASTNode implements IASTNode {
protected static final ICPPFunction UNINITIALIZED_FUNCTION = new CPPFunction(null);
private static final IASTNodeLocation[] EMPTY_LOCATION_ARRAY = new IASTNodeLocation[0];
private IASTNode parent;
private ASTNodeProperty property;
private int length;
private int offset;
private boolean frozen = false;
private boolean active = true;
public IASTNode getParent() {
return parent;
}
public IASTNode[] getChildren() {
ChildCollector collector= new ChildCollector(this);
return collector.getChildren();
}
public boolean isFrozen() {
return frozen;
}
public boolean isActive() {
return active;
}
void setIsFrozen() {
frozen = true;
}
public void setInactive() {
if (frozen)
throw new IllegalStateException("attempt to modify frozen AST node"); //$NON-NLS-1$
active= false;
}
protected void assertNotFrozen() throws IllegalStateException {
if (frozen)
throw new IllegalStateException("attempt to modify frozen AST node"); //$NON-NLS-1$
}
public void setParent(IASTNode node) {
assertNotFrozen();
this.parent = node;
}
public ASTNodeProperty getPropertyInParent() {
return property;
}
public void setPropertyInParent(ASTNodeProperty property) {
assertNotFrozen();
this.property = property;
}
public int getOffset() {
return offset;
}
public int getLength() {
return length;
}
public void setOffset(int offset) {
this.offset = offset;
this.locations = null;
}
public void setLength(int length) {
this.length = length;
this.locations = null;
}
public void setOffsetAndLength(int offset, int length) {
this.offset = offset;
this.length = length;
this.locations = null;
}
public void setOffsetAndLength(ASTNode node) {
setOffsetAndLength(node.getOffset(), node.getLength());
}
private IASTNodeLocation[] locations = null;
private IASTFileLocation fileLocation = null;
public IASTNodeLocation[] getNodeLocations() {
if (locations != null)
return locations;
if (length == 0) {
locations= EMPTY_LOCATION_ARRAY;
} else {
final IASTTranslationUnit tu= getTranslationUnit();
if (tu != null) {
ILocationResolver l= (ILocationResolver) tu.getAdapter(ILocationResolver.class);
if (l != null) {
locations= l.getLocations(offset, length);
}
}
}
return locations;
}
public IASTImageLocation getImageLocation() {
final IASTTranslationUnit tu= getTranslationUnit();
if (tu != null) {
ILocationResolver l= (ILocationResolver) tu.getAdapter(ILocationResolver.class);
if (l != null) {
return l.getImageLocation(offset, length);
}
}
return null;
}
protected char[] getRawSignatureChars() {
final IASTFileLocation floc= getFileLocation();
final IASTTranslationUnit ast = getTranslationUnit();
if (floc != null && ast != null) {
ILocationResolver lr= (ILocationResolver) ast.getAdapter(ILocationResolver.class);
if (lr != null) {
return lr.getUnpreprocessedSignature(getFileLocation());
}
}
return CharArrayUtils.EMPTY;
}
public String getRawSignature() {
return new String(getRawSignatureChars());
}
public String getContainingFilename() {
if (offset <= 0 && (length == 0 || offset < 0)) {
final IASTNode parent = getParent();
if (parent == null) {
if (this instanceof IASTTranslationUnit) {
return ((IASTTranslationUnit) this).getFilePath();
}
return ""; //$NON-NLS-1$
}
return parent.getContainingFilename();
}
return getTranslationUnit().getContainingFilename(offset);
}
public IASTFileLocation getFileLocation() {
if (fileLocation != null)
return fileLocation;
if (offset <= 0 && (length == 0 || offset < 0)) {
return null;
}
IASTTranslationUnit ast = getTranslationUnit();
if (ast != null) {
ILocationResolver lr= (ILocationResolver) ast.getAdapter(ILocationResolver.class);
if (lr != null) {
fileLocation= lr.getMappedFileLocation(offset, length);
} else {
// support for old location map
fileLocation= ast.flattenLocationsToFile(getNodeLocations());
}
}
return fileLocation;
}
public boolean isPartOfTranslationUnitFile() {
IASTTranslationUnit ast = getTranslationUnit();
if (ast != null) {
ILocationResolver lr= (ILocationResolver) ast.getAdapter(ILocationResolver.class);
if (lr != null) {
return lr.isPartOfTranslationUnitFile(offset);
}
}
return false;
}
public boolean isPartOfSourceFile() {
IASTTranslationUnit ast = getTranslationUnit();
if (ast != null) {
ILocationResolver lr= (ILocationResolver) ast.getAdapter(ILocationResolver.class);
if (lr != null) {
return lr.isPartOfSourceFile(offset);
}
}
return false;
}
public IASTTranslationUnit getTranslationUnit() {
return parent != null ? parent.getTranslationUnit() : null;
}
public boolean accept(ASTVisitor visitor) {
return true;
}
public boolean contains(IASTNode node) {
if (node instanceof ASTNode) {
ASTNode astNode= (ASTNode) node;
return offset <= astNode.offset &&
astNode.offset+astNode.length <= offset+length;
}
return false;
}
public IToken getSyntax() throws ExpansionOverlapsBoundaryException {
return getSyntax(offset, offset+length, 0);
}
public IToken getLeadingSyntax() throws ExpansionOverlapsBoundaryException {
int left= getBoundary(-1);
return getSyntax(left, offset, -1);
}
public IToken getTrailingSyntax() throws ExpansionOverlapsBoundaryException {
int right= getBoundary(1);
return getSyntax(offset+length, right, 1);
}
/**
* Compute the sequence number of the boundary of the leading/trailing syntax.
*/
private int getBoundary(int direction) {
ASTNodeSearch visitor= new ASTNodeSearch(this);
IASTNode sib= direction < 0 ? visitor.findLeftSibling() : visitor.findRightSibling();
if (sib == null) {
direction= -direction;
sib= getParent();
}
if (sib instanceof ASTNode) {
ASTNode astNode= (ASTNode) sib;
int offset= astNode.getOffset();
if (direction < 0) {
offset+= astNode.getLength();
}
return offset;
}
// no parent
throw new UnsupportedOperationException();
}
private IToken getSyntax(int fromSequenceNumber, int nextSequenceNumber, int direction) throws ExpansionOverlapsBoundaryException {
final IASTTranslationUnit tu= getTranslationUnit();
if (!(tu instanceof ASTNode))
throw new UnsupportedOperationException();
ILocationResolver lr= (ILocationResolver) tu.getAdapter(ILocationResolver.class);
if (lr == null)
throw new UnsupportedOperationException();
int endSequenceNumber= lr.convertToSequenceEndNumber(nextSequenceNumber);
IASTFileLocation total= lr.getMappedFileLocation(fromSequenceNumber, endSequenceNumber-fromSequenceNumber);
IASTFileLocation myfloc= getFileLocation();
if (total == null || myfloc == null)
throw new UnsupportedOperationException();
if (!total.getFileName().equals(myfloc.getFileName()))
throw new ExpansionOverlapsBoundaryException();
if (fromSequenceNumber > 0) {
IASTFileLocation fl= lr.getMappedFileLocation(fromSequenceNumber-1, endSequenceNumber-fromSequenceNumber+1);
if (fl.getFileName().equals(total.getFileName()) && fl.getNodeOffset() == total.getNodeOffset())
throw new ExpansionOverlapsBoundaryException();
}
if (endSequenceNumber < ((ASTNode) tu).getOffset() + ((ASTNode) tu).getLength()) {
IASTFileLocation fl= lr.getMappedFileLocation(fromSequenceNumber, nextSequenceNumber-fromSequenceNumber+1);
if (fl.getFileName().equals(total.getFileName()) && fl.getNodeLength() == total.getNodeLength())
throw new ExpansionOverlapsBoundaryException();
}
int adjustment= total.getNodeOffset() - myfloc.getNodeOffset();
if (direction > 0) {
adjustment-= myfloc.getNodeLength();
}
char[] txt= lr.getUnpreprocessedSignature(total);
Lexer lex= new Lexer(txt, (LexerOptions) tu.getAdapter(LexerOptions.class), ILexerLog.NULL, null);
try {
Token result= null;
Token last= null;
for (;;) {
Token t= lex.nextToken();
switch (t.getType()) {
case IToken.tEND_OF_INPUT:
return result;
case Lexer.tNEWLINE:
break;
default:
int offset= t.getOffset() + adjustment;
int endOffset= t.getEndOffset() + adjustment;
t.setOffset(offset, endOffset);
if (last == null) {
result= last= t;
} else {
last.setNext(t);
last= t;
}
break;
}
}
} catch (OffsetLimitReachedException e) {
// does not happen without using content assist limit
}
return null;
}
}
