private IEnumerable <ProductionModel> Term(IEbnfTerm term, ProductionModel currentProduction)
{
foreach (var production in Factor(term.Factor, currentProduction))
{
yield return(production);
}
if (term is EbnfTermConcatenation concatenation)
{
foreach (var production in Term(concatenation.Term, currentProduction))
{
yield return(production);
}
}
}
private IEbnfTerm VisitTermNode(IInternalTreeNode node)
{
IEbnfFactor factor = null;
IEbnfTerm term = null;
foreach (var internalNode in node.Children.OfType <IInternalTreeNode>())
{
if (internalNode.Is(EbnfGrammar.Factor))
{
factor = VisitFactorNode(internalNode);
}
else if (internalNode.Is(EbnfGrammar.Term))
{
term = VisitTermNode(internalNode);
}
}
if (term == null)
{
return(new EbnfTermSimple(factor));
}
return(new EbnfTermConcatenation(factor, term));
}
private IEbnfExpression VisitExpressionNode(IInternalTreeNode node)
{
IEbnfTerm term = null;
IEbnfExpression expression = null;
foreach (var internalNode in node.Children.OfType <IInternalTreeNode>())
{
if (internalNode.Is(EbnfGrammar.Term))
{
term = VisitTermNode(internalNode);
}
else if (internalNode.Is(EbnfGrammar.Expression))
{
expression = VisitExpressionNode(internalNode);
}
}
if (expression == null)
{
return(new EbnfExpressionSimple(term));
}
return(new EbnfExpressionAlteration(term, expression));
}
public EbnfTermConcatenation(IEbnfFactor factor, IEbnfTerm term)
{
Factor = factor;
Term = term;
}
public EbnfExpressionAlteration(IEbnfTerm term, IEbnfExpression expression)
{
Term = term;
Expression = expression;
}
public EbnfExpressionSimple(IEbnfTerm term)
{
Term = term;
}