vala/valadeclarationstatement.vala

   1 /* valadeclarationstatement.vala
   2  *
   3  * Copyright (C) 2006-2009  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 Gee;
  24
  25 /**
  26  * Represents a local variable or constant declaration statement in the source code.
  27  */
  28 public class Vala.DeclarationStatement : CodeNode, Statement {
  29         /**
  30          * The local variable or constant declaration.
  31          */
  32         public Symbol declaration {
  33                 get {
  34                         return _declaration;
  35                 }
  36                 set {
  37                         _declaration = value;
  38                         if (_declaration != null) {
  39                                 _declaration.parent_node = this;
  40                         }
  41                 }
  42         }
  43
  44         Symbol _declaration;
  45
  46         /**
  47          * Creates a new declaration statement.
  48          *
  49          * @param decl   local variable declaration
  50          * @param source reference to source code
  51          * @return       newly created declaration statement
  52          */
  53         public DeclarationStatement (Symbol declaration, SourceReference? source_reference) {
  54                 this.declaration = declaration;
  55                 this.source_reference = source_reference;
  56         }
  57
  58         public override void accept (CodeVisitor visitor) {
  59                 visitor.visit_declaration_statement (this);
  60         }
  61
  62         public override void accept_children (CodeVisitor visitor) {
  63                 declaration.accept (visitor);
  64         }
  65
  66         public override bool check (SemanticAnalyzer analyzer) {
  67                 if (checked) {
  68                         return !error;
  69                 }
  70
  71                 checked = true;
  72
  73                 declaration.check (analyzer);
  74
  75                 var local = declaration as LocalVariable;
  76                 if (local != null && local.initializer != null) {
  77                         foreach (DataType error_type in local.initializer.get_error_types ()) {
  78                                 // ensure we can trace back which expression may throw errors of this type
  79                                 var initializer_error_type = error_type.copy ();
  80                                 initializer_error_type.source_reference = local.initializer.source_reference;
  81
  82                                 add_error_type (initializer_error_type);
  83                         }
  84                 }
  85
  86                 return !error;
  87         }
  88
  89         public override void get_defined_variables (Collection<LocalVariable> collection) {
  90                 var local = declaration as LocalVariable;
  91                 if (local != null) {
  92                         var array_type = local.variable_type as ArrayType;
  93                         if (local.initializer != null) {
  94                                 local.initializer.get_defined_variables (collection);
  95                                 collection.add (local);
  96                         } else if (array_type != null && array_type.fixed_length) {
  97                                 collection.add (local);
  98                         }
  99                 }
 100         }
 101
 102         public override void get_used_variables (Collection<LocalVariable> collection) {
 103                 var local = declaration as LocalVariable;
 104                 if (local != null && local.initializer != null) {
 105                         local.initializer.get_used_variables (collection);
 106                 }
 107         }
 108 }