/**
* Parses the given RuleAlternatives into a network of GrammarNodes.
*
* @param ruleAlternatives
* the RuleAlternatives to parse
* @return a grammar graph
*/
private GrammarGraph ProcessRuleAlternatives(JSGFRuleAlternatives ruleAlternatives)
{
this.LogInfo("parseRuleAlternatives: " + ruleAlternatives);
GrammarGraph result = new GrammarGraph(this);
List <JSGFRule> rules = ruleAlternatives.GetRules();
List <Float> weights = GetNormalizedWeights(ruleAlternatives.GetWeights());
// expand each alternative, and connect them in parallel
for (int i = 0; i < rules.Count; i++)
{
JSGFRule rule = rules[i];
float weight = 0.0f;
if (weights != null)
{
weight = weights[i];
}
this.LogInfo("Alternative: " + rule);
GrammarGraph newNodes = ProcessRule(rule);
result.StartNode.Add(newNodes.StartNode, weight);
newNodes.EndNode.Add(result.EndNode, 0.0f);
}
return(result);
}
/**
* Parses the given RuleCount into a network of GrammarNodes.
*
* @param ruleCount
* the RuleCount object to parse
* @return a grammar graph
*/
private GrammarGraph ProcessRuleCount(JSGFRuleCount ruleCount)
{
this.LogInfo("parseRuleCount: " + ruleCount);
GrammarGraph result = new GrammarGraph(this);
int count = ruleCount.Count;
GrammarGraph newNodes = ProcessRule(ruleCount.Rule);
result.StartNode.Add(newNodes.StartNode, 0.0f);
newNodes.EndNode.Add(result.EndNode, 0.0f);
// if this is optional, add a bypass arc
if (count == JSGFRuleCount.ZeroOrMore ||
count == JSGFRuleCount.Optional)
{
result.StartNode.Add(result.EndNode, 0.0f);
}
// if this can possibly occur more than once, add a loopback
if (count == JSGFRuleCount.OnceOrMore ||
count == JSGFRuleCount.ZeroOrMore)
{
newNodes.EndNode.Add(newNodes.StartNode, 0.0f);
}
return(result);
}
/**
* Parses the given RuleName into a network of GrammarNodes.
*
* @param initialRuleName
* the RuleName rule to parse
* @return a grammar graph
*/
private GrammarGraph ProcessRuleName(JSGFRuleName initialRuleName)
{
this.LogInfo("parseRuleName: " + initialRuleName);
GrammarGraph result = RuleStack.Contains(initialRuleName.GetRuleName());
if (result != null)
{ // its a recursive call
return(result);
}
else
{
result = new GrammarGraph(this);
RuleStack.Push(initialRuleName.GetRuleName(), result);
}
JSGFRuleName ruleName = _ruleGrammar.Resolve(initialRuleName);
if (ruleName == JSGFRuleName.Null)
{
result.StartNode.Add(result.EndNode, 0.0f);
}
else if (ruleName == JSGFRuleName.Void)
{
// no connection for void
}
else
{
if (ruleName == null)
{
throw new JSGFGrammarException("Can't resolve "
+ initialRuleName + " g "
+ initialRuleName.GetFullGrammarName());
}
JSGFRuleGrammar rg = Manager.RetrieveGrammar(ruleName
.GetFullGrammarName());
if (rg == null)
{
throw new JSGFGrammarException("Can't resolve grammar name "
+ ruleName.GetFullGrammarName());
}
JSGFRule rule = rg.GetRule(ruleName.GetSimpleRuleName());
if (rule == null)
{
throw new JSGFGrammarException("Can't resolve rule: "
+ ruleName.GetRuleName());
}
GrammarGraph ruleResult = ProcessRule(rule);
if (result != ruleResult)
{
result.StartNode.Add(ruleResult.StartNode, 0.0f);
ruleResult.EndNode.Add(result.EndNode, 0.0f);
}
}
RuleStack.Pop();
return(result);
}
/**
* Commit changes to all loaded grammars and all changes of grammar since
* the last commitChange
*
* @throws JSGFGrammarParseException
* @throws JSGFGrammarException
*/
public virtual void CommitChanges()
{
try
{
if (LoadGrammar)
{
if (Manager == null)
{
GetGrammarManager();
}
_ruleGrammar = LoadNamedGrammar(GrammarName);
LoadImports(_ruleGrammar);
LoadGrammar = false;
}
Manager.LinkGrammars();
RuleStack = new RuleStack();
NewGrammar();
FirstNode = CreateGrammarNode("<sil>");
GrammarNode finalNode = CreateGrammarNode("<sil>");
finalNode.SetFinalNode(true);
// go through each rule and create a network of GrammarNodes
// for each of them
foreach (String ruleName in _ruleGrammar.GetRuleNames())
{
if (_ruleGrammar.IsRulePublic(ruleName))
{
String fullName = GetFullRuleName(ruleName);
GrammarGraph publicRuleGraph = new GrammarGraph(this);
RuleStack.Push(fullName, publicRuleGraph);
JSGFRule rule = _ruleGrammar.GetRule(ruleName);
GrammarGraph graph = ProcessRule(rule);
RuleStack.Pop();
FirstNode.Add(publicRuleGraph.StartNode, 0.0f);
publicRuleGraph.EndNode.Add(finalNode, 0.0f);
publicRuleGraph.StartNode.Add(graph.StartNode,
0.0f);
graph.EndNode.Add(publicRuleGraph.EndNode, 0.0f);
}
}
PostProcessGrammar();
if (Logger.Level == LogLevel.All)
{
DumpGrammar();
}
}
catch (UriFormatException mue)
{
throw new IOException("bad base grammar URL " + BaseUrl + ' ' + mue);
}
}
/**
* Commit changes to all loaded grammars and all changes of grammar since
* the last commitChange
*
* @throws JSGFGrammarParseException
* @throws JSGFGrammarException
*/
public override void CommitChanges()
{
try
{
if (LoadGrammar)
{
if (Manager == null)
{
GetGrammarManager();
}
LoadXML();
LoadGrammar = false;
}
RuleStack = new RuleStack();
NewGrammar();
FirstNode = CreateGrammarNode("<sil>");
var finalNode = CreateGrammarNode("<sil>");
finalNode.SetFinalNode(true);
// go through each rule and create a network of GrammarNodes
// for each of them
foreach (var entry in _rules)
{
var publicRuleGraph = new GrammarGraph(this);
RuleStack.Push(entry.Key, publicRuleGraph);
var graph = ProcessRule(entry.Value);
RuleStack.Pop();
FirstNode.Add(publicRuleGraph.StartNode, 0.0f);
publicRuleGraph.EndNode.Add(finalNode, 0.0f);
publicRuleGraph.StartNode.Add(graph.StartNode,
0.0f);
graph.EndNode.Add(publicRuleGraph.EndNode, 0.0f);
}
PostProcessGrammar();
}
catch (UriFormatException mue)
{
throw new IOException("bad base grammar URL " + BaseUrl + ' ' + mue);
}
}
/**
* Parses the given RuleSequence into a network of GrammarNodes.
*
* @param ruleSequence
* the RuleSequence to parse
* @return the first and last GrammarNodes of the network
*/
private GrammarGraph ProcessRuleSequence(JSGFRuleSequence ruleSequence)
{
GrammarNode startNode = null;
GrammarNode endNode = null;
this.LogInfo("parseRuleSequence: " + ruleSequence);
List <JSGFRule> rules = ruleSequence.Rules;
GrammarNode lastGrammarNode = null;
// expand and connect each rule in the sequence serially
for (int i = 0; i < rules.Count; i++)
{
JSGFRule rule = rules[i];
GrammarGraph newNodes = ProcessRule(rule);
// first node
if (i == 0)
{
startNode = newNodes.StartNode;
}
// last node
if (i == (rules.Count - 1))
{
endNode = newNodes.EndNode;
}
if (i > 0)
{
lastGrammarNode.Add(newNodes.StartNode, 0.0f);
}
lastGrammarNode = newNodes.EndNode;
}
return(new GrammarGraph(startNode, endNode, this));
}
/// <summary>
/// Pushes the grammar graph on the stack
/// </summary>
public void Push(String name, GrammarGraph g)
{
_stack.Insert(0, name);
_map.Put(name, g);
}
