// createGUIQuestion creates a GUIQuestion, the last argument indicates if the question should be disabled (no entry allowed)
func createGUIQuestion(question interfaces.Question, callback func(interfaces.Expr, error), disabled bool) *GUIQuestion {
questionLabel := createLabel(question.LabelAsString())
guiElementVisitor := newQuestionTypeToGUIElementVisitor(question, callback, disabled)
questionElement := question.VarDeclValueType().Accept(guiElementVisitor, nil).(ui.Control)
errorLabel := createLabel("")
return &GUIQuestion{questionLabel, questionElement, errorLabel, question}
}
// 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)))
}
}
// checkQuestionForDuplicateLabels checks if there are multiple questions with the same label, and if so, adds an warning to the typechecker
func checkQuestionForDuplicateLabels(question interfaces.Question, typeChecker interfaces.TypeChecker) {
labelKnown := typeChecker.IsLabelUsed(question.Label())
if labelKnown {
typeChecker.AddEncounteredWarning(errors.NewDuplicateLabelWarning(question, typeChecker.VarIDForLabel(question.Label())))
return
}
typeChecker.MarkLabelAsUsed(question.Label(), question.VarDecl())
}
// checkForCyclicDependencies checks if the this question depends on itself, and if so, adds an error to the typechecker
func checkForCyclicDependencies(question interfaces.Question, typeChecker interfaces.TypeChecker) {
// if we find our own VarID as a dependency at least once, the dependencyChain is cyclic
if typeChecker.DependencyListForVarDeclContainsReferenceToSelf(question.VarDecl()) {
typeChecker.AddEncounteredError(errors.NewCyclicDependencyError(question.VarDecl()))
}
}