// Create looks for identifier in symboltable and creates a pointer if missing.
func (s *SymbolTable) Create(q *ast.QuestionNode) {
identifier := q.Identifier()
label := q.Label()
qType := q.Type()
pos := q.Pos()
primitive := q.Primitive()
_, ok := s.symbolExistP(identifier)
if ok {
s.appendErrf("%s:symboltable error: duplicated identifier found at symbol table: %s",
pos, identifier)
return
}
var symbol interface{}
switch qType {
case ast.ScalarQuestionType:
newSymbol, err := scalarQuestionFactory(primitive)
if err != nil {
s.appendErrf("%s:symboltable error: %s", pos,
err.Error())
}
symbol = newSymbol
case ast.ComputedQuestionType:
symbol = new(ComputedQuestion)
}
s.upsert(identifier, symbol)
s.detectRepeatedLabel(identifier, label)
}
// QuestionNode adds question to symbol table, and dispatch to frontend
// rendering.
func (exec Execute) QuestionNode(q *ast.QuestionNode) {
exec.symboltable.Create(q)
r := exec.symboltable.Read(q.Identifier())
if q.Type() == ast.ComputedQuestionType {
expr := q.Content().(*ast.ComputedQuestion).Expression()
r.(symboltable.StringParser).From(
exec.resolveExpressionIntoString(expr),
)
}
exec.toFrontend <- &plumbing.Frontend{
Type: plumbing.UpdateQuestion,
Identifier: q.Identifier(),
Label: q.Label(),
Value: r.(fmt.Stringer).String(),
}
}