public void Visit(CaseNode node)
{
node.CaseBase.Accept(this);
int branchSelected = -1;
var typeExp0 = node.CaseBase.staticType;
var typeExpK = scope.GetType(node.Branchs[0].formal.type.Text);
for (int i = 0; i < node.Branchs.Count; ++i)
{
if (!scope.IsDefinedType(node.Branchs[i].formal.type.Text, out TypeInfo type))
{
errors.Add(ErrorSemantic.NotDeclaredType(node.Branchs[i].formal.type));
}
var typeK = scope.GetType(node.Branchs[i].formal.type.Text);
var scopeBranch = scope.CreateChild();
scopeBranch.Define(node.Branchs[i].formal.id.text, typeK);
node.Branchs[i].expr.Accept(new SemanticVisit(errors, scopeBranch));
typeExpK = node.Branchs[i].expr.staticType;
if (branchSelected == -1 && typeExp0 <= typeK)
{
branchSelected = i;
}
if (i == 0)
{
node.staticType = node.Branchs[0].expr.staticType;
}
node.staticType = SemanticAlgorithm.LowerCommonAncestor(node.staticType, typeExpK);
}
node.Select = branchSelected;
if (node.Select == -1)
{
errors.Add(ErrorSemantic.NotMatchedBranch(node));
}
}
