public void AnalyzeString(Grammar g, ComplexMachine m, ExpressionTree e, String s, Helper h)
{
List<Int32> rules = new List<int>();
List<Token> usedTokens = new List<Token>();
System.Diagnostics.Debug.WriteLine("Analyzing [" + s + "]");
Stack<Token> st = new Stack<Token>();
st.Push(new Token() { Type = TokenType.Q, Value = "0" });
m.Reset(s);
Token linetok = null;
if (m.HasNext()) linetok = m.GetNextToken();
while (linetok.Type == TokenType.DELIMITER) linetok = m.GetNextToken();
while (st.Count > 0)
{
//Q
Token stacktok = st.Peek();
if (stacktok.Type != TokenType.Q) { System.Diagnostics.Debug.WriteLine("Unexpected token in stack"); return; }
int q = Int32.Parse(stacktok.Value);
String x = h.TableF.ContainsKey(linetok.Value)
? linetok.Value : linetok.Type.ToString();
if (!h.TableF.ContainsKey(x))
{
System.Diagnostics.Debug.WriteLine("Unknown token " + x);
return;
}
String command = h.TableF[x][q];
if (command.StartsWith("shift"))
{
st.Push(linetok);
linetok = m.GetNextToken();
while (linetok.Type == TokenType.DELIMITER) linetok = m.GetNextToken();
if (linetok.Value == String.Empty) linetok.Value = "lambda";
}
else if (command.StartsWith("reduce"))
{
int rulenum = Int32.Parse(command.Substring(6));
Rule rule = g.Rules[rulenum];
for (int r = rule.Right.Count - 1; r >= 0; r--)
{
st.Pop();
Token right = st.Pop();
if (!right.Value.Equals(rule.Right[r]) &&
!right.Type.ToString().Equals(rule.Right[r]))
System.Diagnostics.Debug.WriteLine("Error while reducing according to rule " + rulenum +
": expected " + rule.Right[r] + ", got " + right);
}
st.Push(new Token() { Type = TokenType.NONTERM, Value = rule.Left });
//Console.WriteLine("Reduced according to rule " + rulenum);
System.Diagnostics.Debug.WriteLine("--------- " + rule.Action);
rules.Add(rulenum);
}
else if (command.StartsWith("accept"))
{
st.Pop();
Token start = st.Pop();
Token q0 = st.Pop();
if ((st.Count == 0) && start.Value.Equals(g.Start.Right[0])
&& q0.Value.Equals("0") && (q0.Type == TokenType.Q))
{
System.Diagnostics.Debug.WriteLine("ACCEPTED");
e.BuildByRules(g,rules, usedTokens);
}
else
System.Diagnostics.Debug.WriteLine("Unexpected end of file");
return;
}
else
{
String allowed = String.Empty;
foreach (var key in h.TableF.Keys)
{
if (h.TableF[key][q] != String.Empty)
{
allowed = key;
break;
}
}
throw new Exception("Error: got " + linetok.Value + " while expecting " + allowed);
}
//not q
stacktok = st.Pop();
Token stacktok2 = st.Pop();
q = Int32.Parse(stacktok2.Value);
st.Push(stacktok2);
st.Push(stacktok);
x = h.TableG.ContainsKey(stacktok.Value)
? stacktok.Value : stacktok.Type.ToString();
if (!h.TableG.ContainsKey(x))
{
System.Diagnostics.Debug.WriteLine("Unknown token " + x);
return;
}
if (stacktok.Type != TokenType.NONTERM)
{
usedTokens.Add(stacktok);
System.Diagnostics.Debug.WriteLine("---PUSH " + stacktok.Value);
}
int gt = h.TableG[x][q];
st.Push(new Token() { Type = TokenType.Q, Value = gt.ToString() });
}
}
public static Object SetLexic(String text)
{
RegExpTree tree = new RegExpTree();
tree.Roots = new Dictionary<string, RegExpTreeItem>();
ComplexMachine machine = new ComplexMachine(tree);
try
{
foreach (string line in text.Split('\n').Select(l => l.Trim() + "#"))
{
if (string.IsNullOrEmpty(line)) continue;
int i = 0;
while (line[i] != '=' && i < line.Length - 1) i++;
if (line[i] != '=') continue;
String name = line.Substring(0, i);
String val = line.Substring(i + 1, line.Length - i - 1);
tree.Roots[name] = tree.Load(val);
}
machine = new ComplexMachine(tree);
}
catch (Exception e)
{
return null;
}
UserSession us = HttpContext.Current.Session["UserSession"] as UserSession;
if (us == null)
{
us = new UserSession();
HttpContext.Current.Session.Add("UserSession", us);
}
us.Tree = tree;
us.Machine = machine;
string ret = String.Empty;
foreach (var m in machine.Machines.Keys)
ret = ret + "<br/>" + machine.Machines[m].ToTable(m);
return ret;
}
