net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/ArrayInitializer.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v0.5
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v05.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  ******************************************************************************/
  11 package net.sourceforge.phpdt.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.impl.*;
  15 import net.sourceforge.phpdt.internal.compiler.codegen.*;
  16 import net.sourceforge.phpdt.internal.compiler.flow.*;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.*;
  18
  19 public class ArrayInitializer extends Expression {
  20         public Expression[] expressions;
  21         public ArrayBinding binding; //the type of the { , , , }
  22
  23 /**
  24  * ArrayInitializer constructor comment.
  25  */
  26 public ArrayInitializer() {
  27         super();
  28 }
  29 public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
  30         if (expressions != null) {
  31                 for (int i = 0, max = expressions.length; i < max; i++) {
  32                         flowInfo = expressions[i].analyseCode(currentScope, flowContext, flowInfo).unconditionalInits();
  33                 }
  34         }
  35         return flowInfo;
  36 }
  37 /**
  38  * Code generation for a array initializer
  39  */
  40 public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
  41         // Flatten the values and compute the dimensions, by iterating in depth into nested array initializers
  42
  43         int pc = codeStream.position;
  44         int expressionLength = (expressions == null) ? 0: expressions.length;
  45         codeStream.generateInlinedValue(expressionLength);
  46         codeStream.newArray(currentScope, binding);
  47         if (expressions != null) {
  48                 // binding is an ArrayType, so I can just deal with the dimension
  49                 int elementsTypeID = binding.dimensions > 1 ? -1 : binding.leafComponentType.id;
  50                 for (int i = 0; i < expressionLength; i++) {
  51                         Expression expr;
  52                         if ((expr = expressions[i]).constant != NotAConstant) {
  53                                 switch (elementsTypeID) { // filter out initializations to default values
  54                                         case T_int :
  55                                         case T_short :
  56                                         case T_byte :
  57                                         case T_char :
  58                                         case T_float :
  59                                         case T_long :
  60                                         case T_double :
  61                                                 if (expr.constant.doubleValue() != 0) {
  62                                                         codeStream.dup();
  63                                                         codeStream.generateInlinedValue(i);
  64                                                         expr.generateCode(currentScope, codeStream, true);
  65                                                         codeStream.arrayAtPut(elementsTypeID, false);
  66                                                 }
  67                                                 break;
  68                                         case T_boolean :
  69                                                 if (expr.constant.booleanValue() != false) {
  70                                                         codeStream.dup();
  71                                                         codeStream.generateInlinedValue(i);
  72                                                         expr.generateCode(currentScope, codeStream, true);
  73                                                         codeStream.arrayAtPut(elementsTypeID, false);
  74                                                 }
  75                                                 break;
  76                                         default :
  77                                                 if (expr.constant != NullConstant.Default) {
  78                                                         codeStream.dup();
  79                                                         codeStream.generateInlinedValue(i);
  80                                                         expr.generateCode(currentScope, codeStream, true);
  81                                                         codeStream.arrayAtPut(elementsTypeID, false);
  82                                                 }
  83                                 }
  84                         } else {
  85                                 codeStream.dup();
  86                                 codeStream.generateInlinedValue(i);
  87                                 expr.generateCode(currentScope, codeStream, true);
  88                                 codeStream.arrayAtPut(elementsTypeID, false);
  89                         }
  90                 }
  91         }
  92         if (!valueRequired) {
  93                 codeStream.pop();
  94         }
  95         codeStream.recordPositionsFrom(pc, this.sourceStart);
  96 }
  97 public TypeBinding resolveTypeExpecting(BlockScope scope, TypeBinding expectedTb) {
  98         // Array initializers can only occur on the right hand side of an assignment
  99         // expression, therefore the expected type contains the valid information
 100         // concerning the type that must be enforced by the elements of the array initializer.
 101
 102         // this method is recursive... (the test on isArrayType is the stop case)
 103
 104         constant = NotAConstant;
 105         if (expectedTb.isArrayType()) {
 106                 binding = (ArrayBinding) expectedTb;
 107                 if (expressions == null)
 108                         return binding;
 109                 TypeBinding expectedElementsTb = binding.elementsType(scope);
 110                 if (expectedElementsTb.isBaseType()) {
 111                         for (int i = 0, length = expressions.length; i < length; i++) {
 112                                 Expression expression = expressions[i];
 113                                 TypeBinding expressionTb =
 114                                         (expression instanceof ArrayInitializer)
 115                                                 ? expression.resolveTypeExpecting(scope, expectedElementsTb)
 116                                                 : expression.resolveType(scope);
 117                                 if (expressionTb == null)
 118                                         return null;
 119
 120                                 // Compile-time conversion required?
 121                                 if (expression.isConstantValueOfTypeAssignableToType(expressionTb, expectedElementsTb)) {
 122                                         expression.implicitWidening(expectedElementsTb, expressionTb);
 123                                 } else if (BaseTypeBinding.isWidening(expectedElementsTb.id, expressionTb.id)) {
 124                                         expression.implicitWidening(expectedElementsTb, expressionTb);
 125                                 } else {
 126                                         scope.problemReporter().typeMismatchErrorActualTypeExpectedType(expression, expressionTb, expectedElementsTb);
 127                                         return null;
 128                                 }
 129                         }
 130                 } else {
 131                         for (int i = 0, length = expressions.length; i < length; i++)
 132                                 if (expressions[i].resolveTypeExpecting(scope, expectedElementsTb) == null)
 133                                         return null;
 134                 }
 135                 return binding;
 136         }
 137
 138         // infer initializer type for error reporting based on first element
 139         TypeBinding leafElementType = null;
 140         int dim = 1;
 141         if (expressions == null) {
 142                 leafElementType = scope.getJavaLangObject();
 143         } else {
 144                 Expression currentExpression = expressions[0];
 145                 while(currentExpression != null && currentExpression instanceof ArrayInitializer) {
 146                         dim++;
 147                         Expression[] subExprs = ((ArrayInitializer) currentExpression).expressions;
 148                         if (subExprs == null){
 149                                 leafElementType = scope.getJavaLangObject();
 150                                 currentExpression = null;
 151                                 break;
 152                         }
 153                         currentExpression = ((ArrayInitializer) currentExpression).expressions[0];
 154                 }
 155                 if (currentExpression != null) {
 156                         leafElementType = currentExpression.resolveType(scope);
 157                 }
 158         }
 159         if (leafElementType != null) {
 160                 TypeBinding probableTb = scope.createArray(leafElementType, dim);
 161                 scope.problemReporter().typeMismatchErrorActualTypeExpectedType(this, probableTb, expectedTb);
 162         }
 163         return null;
 164 }
 165 public String toStringExpression() {
 166
 167         String s = "{" ; //$NON-NLS-1$
 168         if (expressions != null)
 169         {       int j = 20 ;
 170                 for (int i = 0 ; i < expressions.length ; i++)
 171                 {       s = s + expressions[i].toStringExpression() + "," ; //$NON-NLS-1$
 172                         j -- ;
 173                         if (j == 0)
 174                         {       s = s + "\n                "; j = 20;}}}; //$NON-NLS-1$
 175         s = s + "}"; //$NON-NLS-1$
 176         return s;}
 177
 178 public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
 179         if (visitor.visit(this, scope)) {
 180                 if (expressions != null) {
 181                         int expressionsLength = expressions.length;
 182                         for (int i = 0; i < expressionsLength; i++)
 183                                 expressions[i].traverse(visitor, scope);
 184                 }
 185         }
 186         visitor.endVisit(this, scope);
 187 }
 188 }