-/*******************************************************************************
- * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Common Public License v0.5
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v05.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- ******************************************************************************/
package net.sourceforge.phpdt.internal.compiler.ast;
-import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
-import net.sourceforge.phpdt.internal.compiler.codegen.*;
-import net.sourceforge.phpdt.internal.compiler.flow.*;
-import net.sourceforge.phpdt.internal.compiler.lookup.*;
+import java.util.List;
+/**
+ * A Block.
+ * {
+ * statements
+ * }.
+ * @author Matthieu Casanova
+ */
public class Block extends Statement {
-
- public Statement[] statements;
- public int explicitDeclarations;
- // the number of explicit declaration , used to create scope
- public BlockScope scope;
- public static final Block None = new Block(0);
-
- public Block(int explicitDeclarations) {
- this.explicitDeclarations = explicitDeclarations;
- }
-
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
- // empty block
- if (statements == null)
- return flowInfo;
- for (int i = 0, max = statements.length; i < max; i++) {
- Statement stat;
- if (!flowInfo.complainIfUnreachable((stat = statements[i]), scope)) {
- flowInfo = stat.analyseCode(scope, flowContext, flowInfo);
- }
- }
- return flowInfo;
- }
-
- public static final Block EmptyWith(int sourceStart, int sourceEnd) {
-
- //return an empty block which position is s and e
- Block bk = new Block(0);
- bk.sourceStart = sourceStart;
- bk.sourceEnd = sourceEnd;
- return bk;
- }
-
- /**
- * Code generation for a block
- */
- public void generateCode(BlockScope currentScope, CodeStream codeStream) {
-
- if ((bits & IsReachableMASK) == 0) {
- return;
- }
- int pc = codeStream.position;
- if (statements != null) {
- for (int i = 0, max = statements.length; i < max; i++) {
- statements[i].generateCode(scope, codeStream);
- }
- } // for local variable debug attributes
- if (scope != currentScope) { // was really associated with its own scope
- codeStream.exitUserScope(scope);
- }
- codeStream.recordPositionsFrom(pc, this.sourceStart);
- }
-
- public boolean isEmptyBlock() {
-
- return statements == null;
- }
-
- public void resolve(BlockScope upperScope) {
-
- if (statements != null) {
- scope =
- explicitDeclarations == 0
- ? upperScope
- : new BlockScope(upperScope, explicitDeclarations);
- int i = 0, length = statements.length;
- while (i < length)
- statements[i++].resolve(scope);
- }
- }
-
- public void resolveUsing(BlockScope givenScope) {
-
- // this optimized resolve(...) is sent only on none empty blocks
- scope = givenScope;
- if (statements != null) {
- int i = 0, length = statements.length;
- while (i < length)
- statements[i++].resolve(scope);
- }
- }
-
- public String toString(int tab) {
-
- String s = tabString(tab);
- if (this.statements == null) {
- s += "{\n"; //$NON-NLS-1$
- s += tabString(tab);
- s += "}"; //$NON-NLS-1$
- return s;
- }
- s += "{\n"; //$NON-NLS-1$
- s += this.toStringStatements(tab);
- s += tabString(tab);
- s += "}"; //$NON-NLS-1$
- return s;
- }
-
- public String toStringStatements(int tab) {
-
- if (this.statements == null)
- return ""; //$NON-NLS-1$
- StringBuffer buffer = new StringBuffer();
- for (int i = 0; i < statements.length; i++) {
- buffer.append(statements[i].toString(tab + 1));
- if (statements[i] instanceof Block) {
- buffer.append("\n"); //$NON-NLS-1$
- } else {
- buffer.append(";\n"); //$NON-NLS-1$
- }
- };
- return buffer.toString();
- }
-
- public void traverse(
- IAbstractSyntaxTreeVisitor visitor,
- BlockScope blockScope) {
-
- if (visitor.visit(this, blockScope)) {
- if (statements != null) {
- int statementLength = statements.length;
- for (int i = 0; i < statementLength; i++)
- statements[i].traverse(visitor, scope);
- }
- }
- visitor.endVisit(this, blockScope);
- }
-
- /**
- * Dispatch the call on its last statement.
- */
- public void branchChainTo(Label label) {
- if (this.statements != null) {
- this.statements[statements.length - 1].branchChainTo(label);
- }
- }
-
-}
\ No newline at end of file
+ /** An array of statements inside the block. */
+ public Statement[] statements;
+
+ /**
+ * Create a block.
+ * @param statements the statements
+ * @param sourceStart starting offset
+ * @param sourceEnd ending offset
+ */
+ public Block(final Statement[] statements,
+ final int sourceStart,
+ final int sourceEnd) {
+ super(sourceStart, sourceEnd);
+ this.statements = statements;
+ }
+
+ /**
+ * tell if the block is empty.
+ * @return the block is empty if there are no statements in it
+ */
+ public boolean isEmptyBlock() {
+ return statements == null;
+ }
+
+ /**
+ * Return the block as String.
+ * @param tab how many tabs
+ * @return the string representation of the block
+ */
+ public String toString(final int tab) {
+ final String s = AstNode.tabString(tab);
+ final StringBuffer buff = new StringBuffer(s);
+ buff.append("{\n"); //$NON-NLS-1$
+ if (this.statements != null) {
+ for (int i = 0; i < statements.length; i++) {
+ buff.append(statements[i].toString(tab + 1)).append(";\n");//$NON-NLS-1$
+ }
+ }
+ buff.append("}\n"); //$NON-NLS-1$
+ return buff.toString();
+ }
+
+ /**
+ * Get the variables from outside (parameters, globals ...)
+ */
+ public void getOutsideVariable(final List list) {
+ for (int i = 0; i < statements.length; i++) {
+ statements[i].getOutsideVariable(list);
+ }
+ }
+
+ /**
+ * get the modified variables.
+ */
+ public void getModifiedVariable(final List list) {
+ for (int i = 0; i < statements.length; i++) {
+ statements[i].getModifiedVariable(list);
+ }
+ }
+
+ /**
+ * Get the variables used.
+ */
+ public void getUsedVariable(final List list) {
+ for (int i = 0; i < statements.length; i++) {
+ statements[i].getUsedVariable(list);
+ }
+ }
+}
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