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

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.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.flow.FlowContext;
  14 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  15 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  16 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  18
  19 public abstract class Literal extends Expression {
  20
  21         public Literal(int s, int e) {
  22                 sourceStart = s;
  23                 sourceEnd = e;
  24         }
  25
  26         public FlowInfo analyseCode(BlockScope currentScope,
  27                         FlowContext flowContext, FlowInfo flowInfo) {
  28                 return flowInfo;
  29         }
  30
  31         public abstract void computeConstant();
  32
  33         // ON ERROR constant STAYS NULL
  34         public abstract TypeBinding literalType(BlockScope scope);
  35
  36         public StringBuffer printExpression(int indent, StringBuffer output) {
  37
  38                 return output.append(source());
  39         }
  40
  41         public TypeBinding resolveType(BlockScope scope) {
  42                 // compute the real value, which must range its type's range
  43
  44                 computeConstant();
  45                 if (constant == null) {
  46                         scope.problemReporter().constantOutOfRange(this);
  47                         constant = Constant.NotAConstant;
  48                         return null;
  49                 }
  50                 this.resolvedType = literalType(scope);
  51                 return this.resolvedType;
  52         }
  53
  54         public abstract char[] source();
  55 }