public bool AddProduction(String production)
{
String predecessor = "";
String successor = "";
double probability = 0.0;
ArrayList strictPredecessor = new ArrayList();
ArrayList lhContext = new ArrayList();
ArrayList rhContext = new ArrayList();
Stack booleanExpression = new Stack();
/*
* split the rule down
*
* First check if its Stochastic or not
*/
production = removeSpaces.Replace(production, "");
Match stochasticRule = stochastic.Match(production);
if (stochasticRule.Success)
{
predecessor = stochasticRule.Groups[1].Value;
successor = stochasticRule.Groups[3].Value;
probability = Double.Parse(stochasticRule.Groups[2].Value);
}
else
{
Match nonStochasticRule = notStochastic.Match(production);
if (nonStochasticRule.Success)
{
predecessor = nonStochasticRule.Groups[1].Value;
successor = nonStochasticRule.Groups[2].Value;
probability = 1.0;
}
else
{
Console.WriteLine("can not parse non Stochastic Production " + production);
return(false);
/* I don't know what it is */
}
}
/* now split up the predecessor */
String[] predecessorSplit = predecessor.Split(new Char[] { ':' });
predecessor = predecessorSplit[0];
if (predecessorSplit.Length > 1)
{
Console.WriteLine("\tFound boolean test " + predecessorSplit[1]);
if (predecessorSplit[1] != "*")
{
booleanExpression = ExpressionEvaluator.ParseExpression(predecessorSplit[1]);
}
}
/*
* now check for context deals with the predecessor in more detail
*/
predecessorSplit = predecessor.Split(new Char[] { '<', '>' });
int index = predecessor.IndexOf('<');
if (index != -1)
{
Console.WriteLine("\tFound left hand context " + predecessorSplit[0]);
lhContext = Rules.ConvertContextToRuleList(predecessorSplit[0]);
Console.WriteLine("\tFound strict predecessor rule " + predecessorSplit[1]);
strictPredecessor = Rules.ConvertPredecessorToRuleList(predecessorSplit[1]);
}
else
{
Console.WriteLine("\tFound strict predecessor rule " + predecessorSplit[0]);
strictPredecessor = Rules.ConvertPredecessorToRuleList(predecessorSplit[0]);
}
index = predecessor.IndexOf('>');
if (index != -1)
{
Console.WriteLine("\tFound right hand context " + predecessorSplit[predecessorSplit.Length - 1]);
rhContext = Rules.ConvertContextToRuleList(predecessorSplit[predecessorSplit.Length - 1]);
}
bool found = false;
foreach (Production knownProduction in productionList)
{
if (knownProduction.IsSameProduction(lhContext, strictPredecessor, rhContext, booleanExpression))
{
knownProduction.AddSuccessor(Rules.ConvertSuccessorToRuleList(successor), probability);
Console.WriteLine("Seen this predecessor before" + predecessor);
found = true;
break;
}
}
/* we've not seen this one before so add a new production to the list */
if (found == false)
{
Production newProduction = new Production();
newProduction.SetPredecessor(lhContext, strictPredecessor, rhContext, booleanExpression);
newProduction.AddSuccessor(Rules.ConvertSuccessorToRuleList(successor), probability);
productionList.Add(newProduction);
}
return(true);
}
