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/*******************************************************************************
 * Copyright (c) 2000, 2009 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.lookup.*;

public class Block extends Statement {

	public Statement[] statements;
	public int explicitDeclarations;
	// the number of explicit declaration , used to create scope
	public BlockScope scope;

public Block(int explicitDeclarations) {
	this.explicitDeclarations = explicitDeclarations;
}

public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
	// empty block
	if (this.statements == null)	return flowInfo;
	int complaintLevel = (flowInfo.reachMode() & FlowInfo.UNREACHABLE) != 0 ? Statement.COMPLAINED_FAKE_REACHABLE : Statement.NOT_COMPLAINED;
	for (int i = 0, max = this.statements.length; i < max; i++) {
		Statement stat = this.statements[i];
		if ((complaintLevel = stat.complainIfUnreachable(flowInfo, this.scope, complaintLevel)) < Statement.COMPLAINED_UNREACHABLE) {
			flowInfo = stat.analyseCode(this.scope, flowContext, flowInfo);
		}
	}
	return flowInfo;
}
/**
 * Code generation for a block
 */
public void generateCode(BlockScope currentScope, CodeStream codeStream) {
	if ((this.bits & IsReachable) == 0) {
		return;
	}
	int pc = codeStream.position;
	if (this.statements != null) {
		for (int i = 0, max = this.statements.length; i < max; i++) {
			this.statements[i].generateCode(this.scope, codeStream);
		}
	} // for local variable debug attributes
	if (this.scope != currentScope) { // was really associated with its own scope
		codeStream.exitUserScope(this.scope);
	}
	codeStream.recordPositionsFrom(pc, this.sourceStart);
}

public boolean isEmptyBlock() {
	return this.statements == null;
}

public StringBuffer printBody(int indent, StringBuffer output) {
	if (this.statements == null) return output;
	for (int i = 0; i < this.statements.length; i++) {
		this.statements[i].printStatement(indent + 1, output);
		output.append('\n');
	}
	return output;
}

public StringBuffer printStatement(int indent, StringBuffer output) {
	printIndent(indent, output);
	output.append("{\n"); //$NON-NLS-1$
	printBody(indent, output);
	return printIndent(indent, output).append('}');
}

public void resolve(BlockScope upperScope) {
	if ((this.bits & UndocumentedEmptyBlock) != 0) {
		upperScope.problemReporter().undocumentedEmptyBlock(this.sourceStart, this.sourceEnd);
	}
	if (this.statements != null) {
		this.scope =
			this.explicitDeclarations == 0
				? upperScope
				: new BlockScope(upperScope, this.explicitDeclarations);
		for (int i = 0, length = this.statements.length; i < length; i++) {
			this.statements[i].resolve(this.scope);
		}
	}
}

public void resolveUsing(BlockScope givenScope) {
	if ((this.bits & UndocumentedEmptyBlock) != 0) {
		givenScope.problemReporter().undocumentedEmptyBlock(this.sourceStart, this.sourceEnd);
	}
	// this optimized resolve(...) is sent only on none empty blocks
	this.scope = givenScope;
	if (this.statements != null) {
		for (int i = 0, length = this.statements.length; i < length; i++) {
			this.statements[i].resolve(this.scope);
		}
	}
}

public void traverse(ASTVisitor visitor, BlockScope blockScope) {
	if (visitor.visit(this, blockScope)) {
		if (this.statements != null) {
			for (int i = 0, length = this.statements.length; i < length; i++)
				this.statements[i].traverse(visitor, this.scope);
		}
	}
	visitor.endVisit(this, blockScope);
}

/**
 * Dispatch the call on its last statement.
 */
public void branchChainTo(BranchLabel label) {
	 if (this.statements != null) {
	 	this.statements[this.statements.length - 1].branchChainTo(label);
	 }
}
}