vala/valapointertype.vala

   1 /* valapointertype.vala
   2  *
   3  * Copyright (C) 2007-2009  Jürg Billeter
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  18  *
  19  * Author:
  20  *      Jürg Billeter <j@bitron.ch>
  21  */
  22
  23 using GLib;
  24
  25 /**
  26  * A pointer type.
  27  */
  28 public class Vala.PointerType : DataType {
  29         /**
  30          * The base type the pointer is referring to.
  31          */
  32         public DataType base_type {
  33                 get { return _base_type; }
  34                 set {
  35                         _base_type = value;
  36                         _base_type.parent_node = this;
  37                 }
  38         }
  39
  40         private DataType _base_type;
  41
  42         public PointerType (DataType base_type, SourceReference? source_reference = null) {
  43                 this.base_type = base_type;
  44                 nullable = true;
  45                 this.source_reference = source_reference;
  46         }
  47
  48         public override string to_qualified_string (Scope? scope) {
  49                 return base_type.to_qualified_string (scope) + "*";
  50         }
  51
  52         public override string? get_cname () {
  53                 if (base_type.data_type != null && base_type.data_type.is_reference_type ()) {
  54                         return base_type.get_cname ();
  55                 } else {
  56                         return base_type.get_cname () + "*";
  57                 }
  58         }
  59
  60         public override DataType copy () {
  61                 return new PointerType (base_type.copy ());
  62         }
  63
  64         public override bool compatible (DataType target_type) {
  65                 if (target_type is PointerType || (target_type.data_type != null && target_type.data_type.get_attribute ("PointerType") != null)) {
  66                         return true;
  67                 }
  68
  69                 /* temporarily ignore type parameters */
  70                 if (target_type.type_parameter != null) {
  71                         return true;
  72                 }
  73
  74                 if (base_type.is_reference_type_or_type_parameter ()) {
  75                         // Object* is compatible with Object if Object is a reference type
  76                         return base_type.compatible (target_type);
  77                 }
  78
  79                 return false;
  80         }
  81
  82         public override Symbol? get_pointer_member (string member_name) {
  83                 Symbol base_symbol = base_type.data_type;
  84
  85                 if (base_symbol == null) {
  86                         return null;
  87                 }
  88
  89                 return SemanticAnalyzer.symbol_lookup_inherited (base_symbol, member_name);
  90         }
  91
  92         public override List<Symbol> get_symbols () {
  93                 return base_type.get_symbols ();
  94         }
  95
  96         public override string? get_type_id () {
  97                 return "G_TYPE_POINTER";
  98         }
  99
 100         public override void accept_children (CodeVisitor visitor) {
 101                 base_type.accept (visitor);
 102         }
 103
 104         public override void replace_type (DataType old_type, DataType new_type) {
 105                 if (base_type == old_type) {
 106                         base_type = new_type;
 107                 }
 108         }
 109
 110         public override bool is_disposable () {
 111                 return false;
 112         }
 113
 114         public override bool check (SemanticAnalyzer analyzer) {
 115                 error = !base_type.check (analyzer);
 116                 return !error;
 117         }
 118 }