+
+ProgramCompiler::VariableResolver::VariableResolver():
+ anonymous(false)
+{ }
+
+void ProgramCompiler::VariableResolver::visit(Block &block)
+{
+ blocks.push_back(&block);
+ block.variables.clear();
+ TraversingVisitor::visit(block);
+ blocks.pop_back();
+}
+
+void ProgramCompiler::VariableResolver::visit(VariableReference &var)
+{
+ var.declaration = 0;
+ type = 0;
+ for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
+ {
+ --i;
+ map<string, VariableDeclaration *>::iterator j = (*i)->variables.find(var.name);
+ if(j!=(*i)->variables.end())
+ {
+ var.declaration = j->second;
+ type = j->second->type_declaration;
+ break;
+ }
+ }
+}
+
+void ProgramCompiler::VariableResolver::visit(MemberAccess &memacc)
+{
+ type = 0;
+ TraversingVisitor::visit(memacc);
+ memacc.declaration = 0;
+ if(type)
+ {
+ map<string, VariableDeclaration *>::iterator i = type->members.variables.find(memacc.member);
+ if(i!=type->members.variables.end())
+ {
+ memacc.declaration = i->second;
+ type = i->second->type_declaration;
+ }
+ else
+ type = 0;
+ }
+}
+
+void ProgramCompiler::VariableResolver::visit(BinaryExpression &binary)
+{
+ if(binary.oper=="[")
+ {
+ binary.right->visit(*this);
+ type = 0;
+ binary.left->visit(*this);
+ }
+ else
+ {
+ TraversingVisitor::visit(binary);
+ type = 0;
+ }
+}
+
+void ProgramCompiler::VariableResolver::visit(StructDeclaration &strct)
+{
+ TraversingVisitor::visit(strct);
+ blocks.back()->types[strct.name] = &strct;
+}
+
+void ProgramCompiler::VariableResolver::visit(VariableDeclaration &var)
+{
+ for(vector<Block *>::iterator i=blocks.end(); i!=blocks.begin(); )
+ {
+ --i;
+ map<string, StructDeclaration *>::iterator j = (*i)->types.find(var.type);
+ if(j!=(*i)->types.end())
+ var.type_declaration = j->second;
+ }
+
+ TraversingVisitor::visit(var);
+ blocks.back()->variables[var.name] = &var;
+ if(anonymous && blocks.size()>1)
+ blocks[blocks.size()-2]->variables[var.name] = &var;
+}
+
+void ProgramCompiler::VariableResolver::visit(InterfaceBlock &iface)
+{
+ SetFlag set(anonymous);
+ TraversingVisitor::visit(iface);
+}
+
+
+void ProgramCompiler::UnusedVariableLocator::visit(VariableReference &var)
+{
+ unused_variables.erase(var.declaration);
+}
+
+void ProgramCompiler::UnusedVariableLocator::visit(MemberAccess &memacc)
+{
+ TraversingVisitor::visit(memacc);
+ unused_variables.erase(memacc.declaration);
+}
+
+void ProgramCompiler::UnusedVariableLocator::visit(VariableDeclaration &var)
+{
+ unused_variables.insert(&var);
+ TraversingVisitor::visit(var);
+}
+
+
+ProgramCompiler::NodeRemover::NodeRemover():
+ n_removed(0),
+ immutable_block(false),
+ remove_block(false)
+{ }
+
+void ProgramCompiler::NodeRemover::visit(Block &block)
+{
+ remove_block = immutable_block;
+ for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
+ {
+ bool remove = false;
+ if(to_remove.count(&**i))
+ remove = !immutable_block;
+ else
+ {
+ remove_block = false;
+ (*i)->visit(*this);
+ remove = remove_block;
+ }
+
+ if(remove)
+ block.body.erase(i++);
+ else
+ ++i;
+
+ n_removed += remove;
+ }
+}
+
+void ProgramCompiler::NodeRemover::visit(StructDeclaration &strct)
+{
+ SetFlag set(immutable_block);
+ TraversingVisitor::visit(strct);
+}
+
+void ProgramCompiler::NodeRemover::visit(InterfaceBlock &iface)
+{
+ SetFlag set(immutable_block);
+ TraversingVisitor::visit(iface);
+}
+