func (this VarDecl) TypeCheck(typeCheckArgs interfaces.TypeCheckArgs) {
// store type for identifier so when we find VarExpr with this VarID we know its real type (used during typechecking)
typeCheckArgs.Symbols().SetTypeForVarID(this.ValueType(), this.VariableIdentifier())
// we mark it as known to indicate that earlier references to this VarID are valid
typeCheckArgs.TypeChecker().MarkVarIDAsKnown(this.VariableIdentifier())
}
// checkQuestionForRedeclarationWithDifferentTypes checks if the passed question has been declared before with a different type, and if so, adds an error to the typechecker
func checkQuestionForRedeclarationWithDifferentTypes(question interfaces.Question, typeCheckArgs interfaces.TypeCheckArgs) {
varDecl := question.VarDecl()
varID := varDecl.VariableIdentifier()
if typeCheckArgs.Symbols().IsTypeSetForVarID(varID) && typeCheckArgs.Symbols().TypeForVarID(varID) != varDecl.ValueType() {
typeCheckArgs.TypeChecker().AddEncounteredError(errors.NewQuestionRedeclaredWithDifferentTypesError(varDecl.ValueType(), typeCheckArgs.Symbols().TypeForVarID(varID)))
}
}
func (this VarExpr) TypeCheck(typeCheckArgs interfaces.TypeCheckArgs) interfaces.ValueType {
typeCheckArgs.TypeChecker().AddDependencyForVarDecl(this.VarIdentifier(), typeCheckArgs.CurrentVarDeclVisited())
// Return the true type of the VarExpr; the type of the Expr referred to
if typeCheckArgs.Symbols().IsTypeSetForVarID(this.VarIdentifier()) {
return typeCheckArgs.Symbols().TypeForVarID(this.VarIdentifier()).(interfaces.ValueType)
}
// We don't already mark it as an error; because there is only one scope, the VarDecl may be simply declared later on
typeCheckArgs.TypeChecker().MarkVarIDAsUnknown(this.VarIdentifier())
// No type info in symbol table (reference to undefined question)
return NewUnknownType()
}