+void ExpressionValidator::visit(Swizzle &swizzle)
+{
+ unsigned size = 0;
+ if(BasicTypeDeclaration *basic = dynamic_cast<BasicTypeDeclaration *>(swizzle.left->type))
+ {
+ if(basic->kind==BasicTypeDeclaration::INT || basic->kind==BasicTypeDeclaration::FLOAT)
+ size = 1;
+ else if(basic->kind==BasicTypeDeclaration::VECTOR)
+ size = basic->size;
+ }
+
+ if(size)
+ {
+ static const char component_names[] = { 'x', 'y', 'z', 'w', 'r', 'g', 'b', 'a', 's', 't', 'p', 'q' };
+ int flavour = -1;
+ for(unsigned i=0; i<swizzle.count; ++i)
+ {
+ unsigned component_flavour = (find(component_names, component_names+12, swizzle.component_group[i])-component_names)/4;
+ if(flavour==-1)
+ flavour = component_flavour;
+ else if(flavour>=0 && component_flavour!=static_cast<unsigned>(flavour))
+ {
+ error(swizzle, format("Flavour of swizzle component '%c' is inconsistent with '%c'",
+ swizzle.component_group[i], swizzle.component_group[0]));
+ flavour = -2;
+ }
+
+ if(swizzle.components[i]>=size)
+ error(swizzle, format("Access to component '%c' which is not present in '%s'",
+ swizzle.component_group[i], swizzle.left->type->name));
+ }
+ }
+ else if(swizzle.left->type)
+ error(swizzle, format("Swizzle applied to '%s' which is neither a scalar nor a vector", swizzle.left->type->name));
+
+ TraversingVisitor::visit(swizzle);
+}
+