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/*******************************************************************************
* Copyright (c) 2007, 2010 Google, Inc 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:
* Sergey Prigogin (Google) - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.ui.search;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.Region;
import org.eclipse.cdt.core.dom.ast.IASTComment;
import org.eclipse.cdt.core.dom.ast.IASTFileLocation;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorElseStatement;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorEndifStatement;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorIfStatement;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorIfdefStatement;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorIfndefStatement;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorMacroDefinition;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorStatement;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorUndefStatement;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.IMacroBinding;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTemplateId;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPConstructor;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPMethod;
import org.eclipse.cdt.internal.core.dom.parser.ASTTranslationUnit;
/**
* Finds locations of linked names. Used by Rename in File.
*/
public class LinkedNamesFinder {
private static final IRegion[] EMPTY_LOCATIONS_ARRAY = new IRegion[0];
private LinkedNamesFinder() {
super();
}
public static IRegion[] findByName(IASTTranslationUnit root, IASTName name) {
IBinding target = name.resolveBinding();
if (target == null) {
return EMPTY_LOCATIONS_ARRAY;
}
BindingFinder bindingFinder = new BindingFinder(root);
bindingFinder.find(target);
return bindingFinder.getLocations();
}
private static class BindingFinder {
private final IASTTranslationUnit root;
private final List<IRegion> locations;
public BindingFinder(IASTTranslationUnit root) {
this.root = root;
locations = new ArrayList<IRegion>();
}
public void find(IBinding target) {
if (target instanceof IMacroBinding) {
findMacro((IMacroBinding) target);
return;
}
if (target instanceof ICPPConstructor ||
target instanceof ICPPMethod && ((ICPPMethod) target).isDestructor()) {
target = ((ICPPMethod) target).getClassOwner();
}
findBinding(target);
if (target instanceof ICPPClassType) {
ICPPConstructor[] constructors = ((ICPPClassType) target).getConstructors();
for (ICPPConstructor ctor : constructors) {
if (!ctor.isImplicit()) {
findBinding(ctor);
}
}
ICPPMethod[] methods = ((ICPPClassType) target).getDeclaredMethods();
for (ICPPMethod method : methods) {
if (method.isDestructor()) {
findBinding(method);
}
}
}
}
public IRegion[] getLocations() {
if (locations.isEmpty()) {
return EMPTY_LOCATIONS_ARRAY;
}
return locations.toArray(new IRegion[locations.size()]);
}
private void findBinding(IBinding target) {
IASTName[] names= root.getDeclarationsInAST(target);
for (IASTName candidate : names) {
if (candidate.isPartOfTranslationUnitFile()) {
addLocation(candidate);
}
}
names= root.getReferences(target);
for (IASTName candidate : names) {
if (candidate.isPartOfTranslationUnitFile()) {
addLocation(candidate);
}
}
}
private void addLocation(IASTName name) {
IBinding binding = name.resolveBinding();
if (binding != null) {
if (name instanceof ICPPASTTemplateId) {
name= ((ICPPASTTemplateId) name).getTemplateName();
}
IASTFileLocation fileLocation= name.getImageLocation();
if (fileLocation == null || !root.getFilePath().equals(fileLocation.getFileName())) {
fileLocation= name.getFileLocation();
}
if (fileLocation != null) {
int offset= fileLocation.getNodeOffset();
int length= fileLocation.getNodeLength();
if (binding instanceof ICPPMethod && ((ICPPMethod) binding).isDestructor()) {
// Skip tilde.
offset++;
length--;
}
if (offset >= 0 && length > 0) {
locations.add(new Region(offset, length));
}
}
}
}
/**
* Adds all occurrences of a macro name to the list of locations. Macro occurrences
* may belong to multiple macro bindings with the same name. Macro names are also
* looked for in the comments of #else and #endif statements.
* Comments of #else and #endif statements related to #ifdef or #ifndef are searched
* for the macro name referenced by the #if[n]def.
* @param target a binding representing a macro.
*/
private void findMacro(IMacroBinding target) {
findBinding(target);
char[] nameChars = target.getNameCharArray();
List<IASTName> ifdefNameStack = new ArrayList<IASTName>();
IASTPreprocessorStatement[] statements = root.getAllPreprocessorStatements();
for (IASTPreprocessorStatement statement : statements) {
if (!statement.isPartOfTranslationUnitFile()) {
continue;
}
IASTName macroName = null;
boolean ifStatement = false;
if (statement instanceof IASTPreprocessorIfdefStatement) {
macroName = ((IASTPreprocessorIfdefStatement) statement).getMacroReference();
ifStatement = true;
} else if (statement instanceof IASTPreprocessorIfndefStatement) {
macroName = ((IASTPreprocessorIfndefStatement) statement).getMacroReference();
ifStatement = true;
} else if (statement instanceof IASTPreprocessorMacroDefinition) {
macroName = ((IASTPreprocessorMacroDefinition) statement).getName();
} else if (statement instanceof IASTPreprocessorUndefStatement) {
macroName = ((IASTPreprocessorUndefStatement) statement).getMacroName();
} else if (statement instanceof IASTPreprocessorIfStatement) {
ifStatement = true;
} else if (statement instanceof IASTPreprocessorEndifStatement) {
if (!ifdefNameStack.isEmpty())
if (ifdefNameStack.remove(ifdefNameStack.size() - 1) != null) {
findInStatementComment(nameChars, statement);
}
} else if (statement instanceof IASTPreprocessorElseStatement) {
if (!ifdefNameStack.isEmpty())
if (ifdefNameStack.get(ifdefNameStack.size() - 1) != null) {
findInStatementComment(nameChars, statement);
}
}
if (macroName != null) {
if (Arrays.equals(nameChars, macroName.getSimpleID())) {
IBinding binding = macroName.resolveBinding();
if (!target.equals(binding)) {
findBinding(binding);
}
} else {
macroName = null;
}
}
if (ifStatement) {
ifdefNameStack.add(macroName);
}
}
}
/**
* Finds locations of a given name in the comment of a preprocessor statement.
*/
private void findInStatementComment(char[] nameChars, IASTPreprocessorStatement statement) {
IASTFileLocation location = statement.getFileLocation();
IASTComment comment = findComment(location.getNodeOffset() + location.getNodeLength());
if (comment != null &&
comment.getFileLocation().getStartingLineNumber() == location.getStartingLineNumber()) {
findInComment(nameChars, comment);
}
}
/**
* Returns the first comment after the given offset.
* @param startOffset a file offset.
* @return a comment or <code>null</code>, if there are no comments after the offset.
*/
private IASTComment findComment(int startOffset) {
IASTComment[] comments = ((ASTTranslationUnit) root).getComments();
int low = 0;
int high = comments.length;
while (low < high) {
int mid = (low + high) / 2;
int offset = comments[mid].getFileLocation().getNodeOffset();
if (offset < startOffset) {
low = mid + 1;
} else {
high = mid;
if (offset == startOffset) {
break;
}
}
}
return high < comments.length ? comments[high] : null;
}
/**
* Adds all occurrences of a name in a comment to the list of locations.
*/
private void findInComment(char[] name, IASTComment comment) {
char[] text = comment.getComment();
int j = 0;
// First two characters are either /* or //
for (int i = 2; i <= text.length - name.length + j; i++) {
char c = text[i];
if (!Character.isJavaIdentifierPart(c)) {
j = 0;
} else if (j >= 0 && j < name.length && name[j] == c) {
j++;
if (j == name.length &&
(i + 1 == text.length || !Character.isJavaIdentifierPart(text[i + 1]))) {
int offset = comment.getFileLocation().getNodeOffset() + i + 1 - name.length;
locations.add(new Region(offset, name.length));
j = 0;
}
} else {
j = -1;
}
}
}
}
}
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