public override void Visit(Nonterminal expression, GrammarFactory <T> context)
{
// Captured nonterminals are given an index of -1 when created.
if (expression.Index == -1)
{
expression.Index = context.nonterminalIndex++;
context.grammar.Nonterminals.Add(expression);
// For these we still want to propagate the walk since there could be more nested content
base.Visit(expression, context);
}
else
{
// We don't propagate the walk since we don't want to follow into any other nonterminals
}
}
public static T Create()
{
ForeignGrammarFactory <T> factory = new ForeignGrammarFactory <T>();
T result = proxyGenerator.CreateClassProxy <T>(factory);
int nonterminalIndex = 0;
// Now initialize the grammar
foreach (MethodInfo method in typeof(T).GetMethods())
{
if (method.ReturnType == typeof(Expression) && method.GetParameters().Length == 0 && !method.IsSpecialName)
{
ForeignNonterminal rule = new ForeignNonterminal();
rule.Name = method.Name;
factory.rules[rule.Name] = rule;
}
}
T tokenizerGrammar = GrammarFactory <T> .Create();
result.SetTokenizer(tokenizerGrammar, tokenizerGrammar.Tokenizer);
return(result);
}
public static T Create(object[] args)
{
GrammarFactory <T> factory = new GrammarFactory <T>();
T result = Proxy.CreateProxy <T>(factory.InvocationHandler);
factory.grammar = result;
result.NotifyCreated(args);
// Now initialize the grammar
foreach (MethodInfo method in typeof(T).GetMethods())
{
if (method.ReturnType == typeof(Expression) && method.GetParameters().Length == 0 && !method.IsSpecialName)
{
Nonterminal rule = new Nonterminal();
rule.Name = method.Name;
rule.Index = factory.nonterminalIndex++;
result.Nonterminals.Add(rule);
// if (method.HasAttribute<StartRuleAttribute>())
// result.StartRule = rule;
factory.rules[method.Name] = rule;
}
}
foreach (MethodInfo method in typeof(T).GetMethods())
{
if (method.ReturnType == typeof(Expression) && method.GetParameters().Length == 0 && !method.IsSpecialName)
{
method.Invoke(result, null);
}
}
foreach (MethodInfo method in typeof(T).GetMethods())
{
if (method.ReturnType == typeof(Expression) && method.GetParameters().Length == 0 && !method.IsSpecialName)
{
Nonterminal rule = factory.rules[method.Name];
if (method.HasAttribute <TokenizerAttribute>())
{
result.Tokenizer = rule;
}
TokenAttribute tokenAttribute = method.GetAttribute <TokenAttribute>();
if (tokenAttribute != null)
{
if (!tokenAttribute.TokenizeChildren)
{
rule.IsToken = true;
if (tokenAttribute.IsOmitted)
{
rule.IsTokenOmitted = true;
}
}
else
{
OrderedChoice children = (OrderedChoice)rule.Expression;
foreach (var child in children.Expressions)
{
Nonterminal childRule = (Nonterminal)child;
childRule.IsToken = true;
}
}
}
}
}
FieldInfo tokenizerGrammarField = typeof(T).GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance).Where(o => typeof(Grammar).IsAssignableFrom(o.FieldType) && o.HasAttribute <TokenizerAttribute>()).FirstOrDefault();
if (tokenizerGrammarField != null)
{
Grammar tokenizerGrammar = (Grammar)tokenizerGrammarField.GetValue(result);
if (tokenizerGrammar.Tokenizer != null)
{
result.SetTokenizer(tokenizerGrammar, tokenizerGrammar.Tokenizer);
}
}
return(result);
}
