public static void dollarPrsing(Stack <String> pda, GrammarParser grammar, string[][] table)
{
while (pda.Count > 0)
{
for (int i = 0; i < table.Length; i++)
{
for (int j = 0; j < table[i].Length; j++)
{
if (table[0][j] == "$")
{
if (table[i][j] != null && table[i][0] != "")
{
if (pda.Count > 0 && table[i][0] == pda.Peek())
{
Derivations d = new Derivations();
d.input = "$";
d.topOfStack = pda.Pop();
d.output = table[i][j];
List <String> temp = new List <String>();
temp.Add(d.output);
List <List <String> > productions = splitProduction(temp, grammar);
for (int k = productions[0].Count - 1; k >= 0; k--)
{
if (productions[0][k] != "!")
{
pda.Push(productions[0][k]);
}
}
output.Add(d);
}
}
}
}
}
}
}
public static List <Derivations> parser(GrammarParser grammar, List <String> input)
{
var table = new ParseTable(grammar).table;
Stack <String> pda = new Stack <String>();
bool error = false;
bool first = true;
for (int a = 0; a < input.Count; a++)
{
bool done = false;
while (!done)
{
if (error)
{
break;
}
for (int i = 0; i < table.Length; i++)
{
for (int j = 0; j < table[i].Length; j++)
{
String var = input[a];
if (table[0][j] == var)
{
if (!(table[i][0] == ""))
{
if (table[i][j] != null && first)
{
pda.Push(table[i][0]);
first = false;
}
if (table[i][j] != null && pda.Count > 0 && !first && !(table[i][j] == var) &&
table[i][0] == pda.Peek())
{
Derivations d = new Derivations();
d.input = var;
d.topOfStack = pda.Pop();
d.output = table[i][j];
List <String> temp = new List <String>();
temp.Add(d.output);
List <List <String> > productions = splitProduction(temp, grammar);
for (int k = productions[0].Count - 1; k >= 0; k--)
{
if (productions[0][k] != "!")
{
pda.Push(productions[0][k]);
}
}
output.Add(d);
}
if (table[i][j] != null && pda.Count > 0 && (!first && table[i][j] == var) &&
table[i][0] == pda.Peek())
{
Derivations d = new Derivations();
d.input = var;
d.output = table[i][j];
d.topOfStack = pda.Pop();
List <String> temp = new List <String>();
temp.Add(d.output);
List <List <String> > productions = splitProduction(temp, grammar);
for (int k = productions[0].Count - 1; k >= 0; k--)
{
if (productions[0][k] != "!")
{
pda.Push(productions[0][k]);
}
}
output.Add(d);
}
if (table[i][j] != null && grammar.terminals.Contains(pda.Peek()) &&
pda.Peek() == var)
{
Derivations d = new Derivations();
d.input = "";
d.output = pda.Peek();
d.topOfStack = pda.Pop();
done = true;
output.Add(d);
}
if (table[i][j] == null && table[0][j] == var && table[i][0] == pda.Peek() &&
!done)
{
error = true;
}
}
}
}
}
}
}
if (!error)
{
dollarPrsing(pda, grammar, table);
}
if (error)
{
output = null;
}
return(output);
}
