private EbnfBlockRule VisitRuleNode(IInternalTreeNode node)
{
EbnfQualifiedIdentifier qualifiedIdentifier = 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.QualifiedIdentifier == symbolValue)
{
qualifiedIdentifier = VisitQualifiedIdentifierNode(internalNode);
}
else if (EbnfGrammar.Expression == symbolValue)
{
expression = VisitExpressionNode(internalNode);
}
break;
case TreeNodeType.Token:
break;
}
}
return(new EbnfBlockRule(
new EbnfRule(qualifiedIdentifier, expression)));
}
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> Expression(EbnfExpression expression, ProductionModel currentProduction)
{
foreach (var production in Term(expression.Term, currentProduction))
{
yield return(production);
}
if (expression.NodeType != EbnfNodeType.EbnfExpressionAlteration)
{
yield break;
}
var expressionAlteration = expression as EbnfExpressionAlteration;
currentProduction.Lambda();
foreach (var production in Expression(expressionAlteration.Expression, currentProduction))
{
yield return(production);
}
}
public EbnfFactorGrouping(EbnfExpression expression)
{
Expression = expression;
_hashCode = ComputeHashCode();
}
public EbnfFactorOptional(EbnfExpression expression)
{
Expression = expression;
_hashCode = ComputeHashCode();
}
public EbnfFactorRepetition(EbnfExpression expression)
{
Expression = expression;
_hashCode = ComputeHashCode();
}
public EbnfRule(EbnfQualifiedIdentifier qualifiedIdentifier, EbnfExpression expression)
{
QualifiedIdentifier = qualifiedIdentifier;
Expression = expression;
_hashCode = ComputeHashCode();
}