/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.parser;
/**
* Internal block structure for parsing recovery
*/
import org.eclipse.jdt.core.compiler.*;
import org.eclipse.jdt.internal.compiler.ast.Argument;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.Block;
import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration;
import org.eclipse.jdt.internal.compiler.ast.LocalDeclaration;
import org.eclipse.jdt.internal.compiler.ast.Statement;
import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.eclipse.jdt.internal.compiler.lookup.BaseTypes;
import org.eclipse.jdt.internal.compiler.lookup.CompilerModifiers;
public class RecoveredBlock extends RecoveredStatement implements CompilerModifiers, TerminalTokens, BaseTypes {
public Block blockDeclaration;
public RecoveredStatement[] statements;
public int statementCount;
public boolean preserveContent = false;
public RecoveredLocalVariable pendingArgument;
public RecoveredBlock(Block block, RecoveredElement parent, int bracketBalance){
super(block, parent, bracketBalance);
this.blockDeclaration = block;
this.foundOpeningBrace = true;
}
/*
* Record a nested block declaration
*/
public RecoveredElement add(Block nestedBlockDeclaration, int bracketBalanceValue) {
/* do not consider a nested block starting passed the block end (if set)
it must be belonging to an enclosing block */
if (this.blockDeclaration.sourceEnd != 0
&& nestedBlockDeclaration.sourceStart > this.blockDeclaration.sourceEnd){
return this.parent.add(nestedBlockDeclaration, bracketBalanceValue);
}
RecoveredBlock element = new RecoveredBlock(nestedBlockDeclaration, this, bracketBalanceValue);
// if we have a pending Argument, promote it into the new block
if (this.pendingArgument != null){
element.attach(this.pendingArgument);
this.pendingArgument = null;
}
this.attach(element);
if (nestedBlockDeclaration.sourceEnd == 0) return element;
return this;
}
/*
* Record a local declaration
*/
public RecoveredElement add(LocalDeclaration localDeclaration, int bracketBalanceValue) {
return this.add(localDeclaration, bracketBalanceValue, false);
}
/*
* Record a local declaration
*/
public RecoveredElement add(LocalDeclaration localDeclaration, int bracketBalanceValue, boolean delegatedByParent) {
/* local variables inside method can only be final and non void */
/*
char[][] localTypeName;
if ((localDeclaration.modifiers & ~AccFinal) != 0 // local var can only be final
|| (localDeclaration.type == null) // initializer
|| ((localTypeName = localDeclaration.type.getTypeName()).length == 1 // non void
&& CharOperation.equals(localTypeName[0], VoidBinding.sourceName()))){
if (delegatedByParent){
return this; //ignore
} else {
this.updateSourceEndIfNecessary(this.previousAvailableLineEnd(localDeclaration.declarationSourceStart - 1));
return this.parent.add(localDeclaration, bracketBalance);
}
}
*/
/* do not consider a local variable starting passed the block end (if set)
it must be belonging to an enclosing block */
if (this.blockDeclaration.sourceEnd != 0
&& localDeclaration.declarationSourceStart > this.blockDeclaration.sourceEnd){
if (delegatedByParent) return this; //ignore
return this.parent.add(localDeclaration, bracketBalanceValue);
}
RecoveredLocalVariable element = new RecoveredLocalVariable(localDeclaration, this, bracketBalanceValue);
if (localDeclaration instanceof Argument){
this.pendingArgument = element;
return this;
}
this.attach(element);
if (localDeclaration.declarationSourceEnd == 0) return element;
return this;
}
/*
* Record a statement declaration
*/
public RecoveredElement add(Statement stmt, int bracketBalanceValue) {
return this.add(stmt, bracketBalanceValue, false);
}
/*
* Record a statement declaration
*/
public RecoveredElement add(Statement stmt, int bracketBalanceValue, boolean delegatedByParent) {
/* do not consider a nested block starting passed the block end (if set)
it must be belonging to an enclosing block */
if (this.blockDeclaration.sourceEnd != 0
&& stmt.sourceStart > this.blockDeclaration.sourceEnd){
if (delegatedByParent) return this; //ignore
return this.parent.add(stmt, bracketBalanceValue);
}
RecoveredStatement element = new RecoveredStatement(stmt, this, bracketBalanceValue);
this.attach(element);
if (stmt.sourceEnd == 0) return element;
return this;
}
/*
* Addition of a type to an initializer (act like inside method body)
*/
public RecoveredElement add(TypeDeclaration typeDeclaration, int bracketBalanceValue) {
return this.add(typeDeclaration, bracketBalanceValue, false);
}
/*
* Addition of a type to an initializer (act like inside method body)
*/
public RecoveredElement add(TypeDeclaration typeDeclaration, int bracketBalanceValue, boolean delegatedByParent) {
/* do not consider a type starting passed the block end (if set)
it must be belonging to an enclosing block */
if (this.blockDeclaration.sourceEnd != 0
&& typeDeclaration.declarationSourceStart > this.blockDeclaration.sourceEnd){
if (delegatedByParent) return this; //ignore
return this.parent.add(typeDeclaration, bracketBalanceValue);
}
RecoveredStatement element = new RecoveredType(typeDeclaration, this, bracketBalanceValue);
this.attach(element);
if (typeDeclaration.declarationSourceEnd == 0) return element;
return this;
}
/*
* Attach a recovered statement
*/
void attach(RecoveredStatement recoveredStatement) {
if (this.statements == null) {
this.statements = new RecoveredStatement[5];
this.statementCount = 0;
} else {
if (this.statementCount == this.statements.length) {
System.arraycopy(
this.statements,
0,
(this.statements = new RecoveredStatement[2 * this.statementCount]),
0,
this.statementCount);
}
}
this.statements[this.statementCount++] = recoveredStatement;
}
/*
* Answer the associated parsed structure
*/
public ASTNode parseTree(){
return this.blockDeclaration;
}
public String toString(int tab) {
StringBuffer result = new StringBuffer(tabString(tab));
result.append("Recovered block:\n"); //$NON-NLS-1$
this.blockDeclaration.print(tab + 1, result);
if (this.statements != null) {
for (int i = 0; i < this.statementCount; i++) {
result.append("\n"); //$NON-NLS-1$
result.append(this.statements[i].toString(tab + 1));
}
}
return result.toString();
}
/*
* Rebuild a block from the nested structure which is in scope
*/
public Block updatedBlock(){
// if block was not marked to be preserved or empty, then ignore it
if (!this.preserveContent || this.statementCount == 0) return null;
Statement[] updatedStatements = new Statement[this.statementCount];
int updatedCount = 0;
// only collect the non-null updated statements
for (int i = 0; i < this.statementCount; i++){
Statement updatedStatement = this.statements[i].updatedStatement();
if (updatedStatement != null){
updatedStatements[updatedCount++] = updatedStatement;
}
}
if (updatedCount == 0) return null; // not interesting block
// resize statement collection if necessary
if (updatedCount != this.statementCount){
this.blockDeclaration.statements = new Statement[updatedCount];
System.arraycopy(updatedStatements, 0, this.blockDeclaration.statements, 0, updatedCount);
} else {
this.blockDeclaration.statements = updatedStatements;
}
return this.blockDeclaration;
}
/*
* Rebuild a statement from the nested structure which is in scope
*/
public Statement updatedStatement(){
return this.updatedBlock();
}
/*
* A closing brace got consumed, might have closed the current element,
* in which case both the currentElement is exited
*/
public RecoveredElement updateOnClosingBrace(int braceStart, int braceEnd){
if ((--this.bracketBalance <= 0) && (this.parent != null)){
this.updateSourceEndIfNecessary(braceStart, braceEnd);
/* if the block is the method body, then it closes the method too */
RecoveredMethod method = enclosingMethod();
if (method != null && method.methodBody == this){
return this.parent.updateOnClosingBrace(braceStart, braceEnd);
}
RecoveredInitializer initializer = enclosingInitializer();
if (initializer != null && initializer.initializerBody == this){
return this.parent.updateOnClosingBrace(braceStart, braceEnd);
}
return this.parent;
}
return this;
}
/*
* An opening brace got consumed, might be the expected opening one of the current element,
* in which case the bodyStart is updated.
*/
public RecoveredElement updateOnOpeningBrace(int braceStart, int braceEnd){
// create a nested block
Block block = new Block(0);
block.sourceStart = parser().scanner.startPosition;
return this.add(block, 1);
}
/*
* Final update the corresponding parse node
*/
public void updateParseTree(){
this.updatedBlock();
}
/*
* Rebuild a flattened block from the nested structure which is in scope
*/
public Statement updateStatement(){
// if block was closed or empty, then ignore it
if (this.blockDeclaration.sourceEnd != 0 || this.statementCount == 0) return null;
Statement[] updatedStatements = new Statement[this.statementCount];
int updatedCount = 0;
// only collect the non-null updated statements
for (int i = 0; i < this.statementCount; i++){
Statement updatedStatement = this.statements[i].updatedStatement();
if (updatedStatement != null){
updatedStatements[updatedCount++] = updatedStatement;
}
}
if (updatedCount == 0) return null; // not interesting block
// resize statement collection if necessary
if (updatedCount != this.statementCount){
this.blockDeclaration.statements = new Statement[updatedCount];
System.arraycopy(updatedStatements, 0, this.blockDeclaration.statements, 0, updatedCount);
} else {
this.blockDeclaration.statements = updatedStatements;
}
return this.blockDeclaration;
}
/*
* Record a field declaration
*/
public RecoveredElement add(FieldDeclaration fieldDeclaration, int bracketBalanceValue) {
/* local variables inside method can only be final and non void */
char[][] fieldTypeName;
if ((fieldDeclaration.modifiers & ~AccFinal) != 0 // local var can only be final
|| (fieldDeclaration.type == null) // initializer
|| ((fieldTypeName = fieldDeclaration.type.getTypeName()).length == 1 // non void
&& CharOperation.equals(fieldTypeName[0], VoidBinding.sourceName()))){
this.updateSourceEndIfNecessary(this.previousAvailableLineEnd(fieldDeclaration.declarationSourceStart - 1));
return this.parent.add(fieldDeclaration, bracketBalanceValue);
}
/* do not consider a local variable starting passed the block end (if set)
it must be belonging to an enclosing block */
if (this.blockDeclaration.sourceEnd != 0
&& fieldDeclaration.declarationSourceStart > this.blockDeclaration.sourceEnd){
return this.parent.add(fieldDeclaration, bracketBalanceValue);
}
// ignore the added field, since indicates a local variable behind recovery point
// which thus got parsed as a field reference. This can happen if restarting after
// having reduced an assistNode to get the following context (see 1GEK7SG)
return this;
}
}