private EbnfTerm VisitTermNode(IInternalTreeNode node)
{
EbnfFactor factor = null;
EbnfTerm term = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Factor == symbolValue)
{
factor = VisitFactorNode(internalNode);
}
else if (EbnfGrammar.Term == symbolValue)
{
term = VisitTermNode(internalNode);
}
break;
case TreeNodeType.Token:
break;
}
}
if (term == null)
{
return(new EbnfTerm(factor));
}
return(new EbnfTermConcatenation(factor, term));
}
private EbnfExpression VisitExpressionNode(IInternalTreeNode node)
{
EbnfTerm term = null;
EbnfExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
switch (child.NodeType)
{
case TreeNodeType.Internal:
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (EbnfGrammar.Term == symbolValue)
{
term = VisitTermNode(internalNode);
}
else if (EbnfGrammar.Expression == symbolValue)
{
expression = VisitExpressionNode(internalNode);
}
break;
case TreeNodeType.Token:
break;
}
}
if (expression == null)
{
return(new EbnfExpression(term));
}
return(new EbnfExpressionAlteration(term, expression));
}
public EbnfExpressionAlteration(
EbnfTerm term,
EbnfExpression expression)
: base(term)
{
Expression = expression;
_hashCode = ComputeHashCode();
}
IEnumerable <ProductionModel> Term(EbnfTerm term, ProductionModel currentProduction)
{
foreach (var production in Factor(term.Factor, currentProduction))
{
yield return(production);
}
if (term.NodeType != EbnfNodeType.EbnfTermConcatenation)
{
yield break;
}
var concatenation = term as EbnfTermConcatenation;
foreach (var production in Term(concatenation.Term, currentProduction))
{
yield return(production);
}
}
public EbnfExpression(EbnfTerm term)
{
Term = term;
_hashCode = ComputeHashCode();
}
public EbnfTermConcatenation(EbnfFactor factor, EbnfTerm term)
: base(factor)
{
Term = term;
_hashCode = ComputeHashCode();
}
IEnumerable<ProductionModel> Term(EbnfTerm term, ProductionModel currentProduction)
{
foreach (var production in Factor(term.Factor, currentProduction))
yield return production;
if (term.NodeType != EbnfNodeType.EbnfTermConcatenation)
yield break;
var concatenation = term as EbnfTermConcatenation;
foreach(var production in Term(concatenation.Term, currentProduction))
yield return production;
}
public EbnfTermConcatenation(EbnfFactor factor, EbnfTerm term)
: base(factor)
{
Term = term;
_hashCode = ComputeHashCode();
}