/*
See Algorithm: set.Closure() in package doc
*/
func (this ItemList) Closure(lexPart *ast.LexPart, symbols *symbols.Symbols) ItemList {
closure := this
for i := 0; i < len(closure); i++ {
expSym := closure[i].ExpectedSymbol()
if regDefId, isRegDefId := expSym.(*ast.LexRegDefId); isRegDefId {
if !this.ContainShift(expSym.String()) && !symbols.IsImport(regDefId.Id) {
closure = closure.AddNoDuplicate(NewItem(regDefId.Id, lexPart, symbols).Emoves()...)
}
}
}
return closure
}
