src/Boo.Lang.Compiler/Steps/CheckMembersProtectionLevel.cs

   1 #region license
   2 // Copyright (c) 2004, Rodrigo B. de Oliveira (rbo@acm.org)
   3 // All rights reserved.
   4 //
   5 // Redistribution and use in source and binary forms, with or without modification,
   6 // are permitted provided that the following conditions are met:
   7 //
   8 //     * Redistributions of source code must retain the above copyright notice,
   9 //     this list of conditions and the following disclaimer.
  10 //     * Redistributions in binary form must reproduce the above copyright notice,
  11 //     this list of conditions and the following disclaimer in the documentation
  12 //     and/or other materials provided with the distribution.
  13 //     * Neither the name of Rodrigo B. de Oliveira nor the names of its
  14 //     contributors may be used to endorse or promote products derived from this
  15 //     software without specific prior written permission.
  16 //
  17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  18 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
  21 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  24 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27 #endregion
  28
  29 namespace Boo.Lang.Compiler.Steps
  30 {
  31         using Boo.Lang.Compiler;
  32         using Boo.Lang.Compiler.Ast;
  33         using Boo.Lang.Compiler.TypeSystem;
  34
  35         /// <summary>
  36         /// </summary>
  37         public class CheckMembersProtectionLevel : AbstractVisitorCompilerStep
  38         {
  39                 private IAccessibilityChecker _checker = AccessibilityChecker.Global;
  40
  41                 override public void Run()
  42                 {
  43                         Visit(CompileUnit);
  44                 }
  45
  46                 override public void OnClassDefinition(ClassDefinition node)
  47                 {
  48                         IAccessibilityChecker saved = _checker;
  49                         _checker = new AccessibilityChecker(node);
  50                         base.OnClassDefinition(node);
  51                         _checker = saved;
  52                 }
  53
  54                 override public void LeaveMemberReferenceExpression(MemberReferenceExpression node)
  55                 {
  56                         OnReferenceExpression(node);
  57                 }
  58
  59                 override public void OnReferenceExpression(ReferenceExpression node)
  60                 {
  61                         IAccessibleMember member = node.Entity as IAccessibleMember;
  62                         if (null == member) return;
  63
  64                         if (_checker.IsAccessible(member)) return;
  65                         Error(CompilerErrorFactory.UnaccessibleMember(node, member.FullName));
  66                 }
  67         }
  68 }