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package org.eclipse.jdt.internal.compiler.parser;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
/**
* Internal block structure for parsing recovery
*/
import org.eclipse.jdt.internal.compiler.ast.*;
import org.eclipse.jdt.internal.compiler.lookup.*;
public class RecoveredBlock extends RecoveredStatement implements CompilerModifiers, TerminalSymbols {
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 bracketBalance) {
/* do not consider a nested block starting passed the block end (if set)
it must be belonging to an enclosing block */
if (blockDeclaration.sourceEnd != 0
&& nestedBlockDeclaration.sourceStart > blockDeclaration.sourceEnd){
return this.parent.add(nestedBlockDeclaration, bracketBalance);
}
RecoveredBlock element = new RecoveredBlock(nestedBlockDeclaration, this, bracketBalance);
// if we have a pending Argument, promote it into the new block
if (pendingArgument != null){
element.attach(pendingArgument);
pendingArgument = null;
}
this.attach(element);
if (nestedBlockDeclaration.sourceEnd == 0) return element;
return this;
}
/*
* Record a local declaration
*/
public RecoveredElement add(LocalDeclaration localDeclaration, int bracketBalance) {
/* do not consider a local variable starting passed the block end (if set)
it must be belonging to an enclosing block */
if (blockDeclaration.sourceEnd != 0
&& localDeclaration.declarationSourceStart > blockDeclaration.sourceEnd){
return this.parent.add(localDeclaration, bracketBalance);
}
RecoveredLocalVariable element = new RecoveredLocalVariable(localDeclaration, this, bracketBalance);
if (localDeclaration instanceof Argument){
pendingArgument = element;
return this;
}
this.attach(element);
if (localDeclaration.declarationSourceEnd == 0) return element;
return this;
}
/*
* Record a statement declaration
*/
public RecoveredElement add(Statement statement, int bracketBalance) {
/* do not consider a nested block starting passed the block end (if set)
it must be belonging to an enclosing block */
if (blockDeclaration.sourceEnd != 0
&& statement.sourceStart > blockDeclaration.sourceEnd){
return this.parent.add(statement, bracketBalance);
}
RecoveredStatement element = new RecoveredStatement(statement, this, bracketBalance);
this.attach(element);
if (statement.sourceEnd == 0) return element;
return this;
}
/*
* Addition of a type to an initializer (act like inside method body)
*/
public RecoveredElement add(TypeDeclaration typeDeclaration, int bracketBalance) {
/* do not consider a type starting passed the block end (if set)
it must be belonging to an enclosing block */
if (blockDeclaration.sourceEnd != 0
&& typeDeclaration.declarationSourceStart > blockDeclaration.sourceEnd){
return this.parent.add(typeDeclaration, bracketBalance);
}
RecoveredStatement element = new RecoveredType(typeDeclaration, this, bracketBalance);
this.attach(element);
if (typeDeclaration.declarationSourceEnd == 0) return element;
return this;
}
/*
* Attach a recovered statement
*/
void attach(RecoveredStatement recoveredStatement) {
if (statements == null) {
statements = new RecoveredStatement[5];
statementCount = 0;
} else {
if (statementCount == statements.length) {
System.arraycopy(
statements,
0,
(statements = new RecoveredStatement[2 * statementCount]),
0,
statementCount);
}
}
statements[statementCount++] = recoveredStatement;
}
/*
* Answer the associated parsed structure
*/
public AstNode parseTree(){
return blockDeclaration;
}
public String toString(int tab) {
StringBuffer result = new StringBuffer(tabString(tab));
result.append("Recovered block:\n");
result.append(blockDeclaration.toString(tab + 1));
if (this.statements != null) {
for (int i = 0; i < this.statementCount; i++) {
result.append("\n");
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 (!preserveContent || statementCount == 0) return null;
Statement[] updatedStatements = new Statement[statementCount];
int updatedCount = 0;
// only collect the non-null updated statements
for (int i = 0; i < statementCount; i++){
Statement updatedStatement = statements[i].updatedStatement();
if (updatedStatement != null){
updatedStatements[updatedCount++] = updatedStatement;
}
}
if (updatedCount == 0) return null; // not interesting block
// resize statement collection if necessary
if (updatedCount != statementCount){
blockDeclaration.statements = new Statement[updatedCount];
System.arraycopy(updatedStatements, 0, blockDeclaration.statements, 0, updatedCount);
} else {
blockDeclaration.statements = updatedStatements;
}
return 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 ((--bracketBalance <= 0) && (parent != null)){
this.updateSourceEndIfNecessary(braceEnd);
/* if the block is the method body, then it closes the method too */
RecoveredMethod method = enclosingMethod();
if (method != null && method.methodBody == this){
return parent.updateOnClosingBrace(braceStart, braceEnd);
}
return 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 currentPosition){
// 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 || statementCount == 0) return null;
Statement[] updatedStatements = new Statement[statementCount];
int updatedCount = 0;
// only collect the non-null updated statements
for (int i = 0; i < statementCount; i++){
Statement updatedStatement = statements[i].updatedStatement();
if (updatedStatement != null){
updatedStatements[updatedCount++] = updatedStatement;
}
}
if (updatedCount == 0) return null; // not interesting block
// resize statement collection if necessary
if (updatedCount != statementCount){
blockDeclaration.statements = new Statement[updatedCount];
System.arraycopy(updatedStatements, 0, blockDeclaration.statements, 0, updatedCount);
} else {
blockDeclaration.statements = updatedStatements;
}
return blockDeclaration;
}
}
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