private PdlLexerRuleTerm VisitLexerRuleTermNode(IInternalTreeNode node)
{
PdlLexerRuleFactor factor = null;
PdlLexerRuleTerm term = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (PdlGrammar.LexerRuleFactor == symbolValue)
{
factor = VisitLexerRuleFactorNode(internalNode);
}
if (PdlGrammar.LexerRuleTerm == symbolValue)
{
term = VisitLexerRuleTermNode(internalNode);
}
}
if (term is null)
{
return(new PdlLexerRuleTerm(factor));
}
return(new PdlLexerRuleTermConcatenation(factor, term));
}
private PdlLexerRuleExpression VisitLexerRuleExpressionNode(IInternalTreeNode node)
{
PdlLexerRuleTerm term = null;
PdlLexerRuleExpression expression = null;
for (int c = 0; c < node.Children.Count; c++)
{
var child = node.Children[c];
if (child.NodeType != TreeNodeType.Internal)
{
continue;
}
var internalNode = child as IInternalTreeNode;
var symbolValue = internalNode.Symbol.Value;
if (PdlGrammar.LexerRuleTerm == symbolValue)
{
term = VisitLexerRuleTermNode(internalNode);
}
if (PdlGrammar.LexerRuleExpression == symbolValue)
{
expression = VisitLexerRuleExpressionNode(internalNode);
}
}
if (expression is null)
{
return(new PdlLexerRuleExpression(term));
}
return(new PdlLexerRuleExpressionAlteration(term, expression));
}
INfa LexerRuleTerm(PdlLexerRuleTerm term)
{
var nfa = LexerRuleFactor(term.Factor);
if (term.NodeType == PdlNodeType.PdlLexerRuleTermConcatenation)
{
var concatenation = term as PdlLexerRuleTermConcatenation;
var concatNfa = LexerRuleTerm(concatenation.Term);
nfa = nfa.Concatenation(concatNfa);
}
return(nfa);
}
public PdlLexerRuleTermConcatenation(PdlLexerRuleFactor factor, PdlLexerRuleTerm term)
: base(factor)
{
Term = term;
_hashCode = ComputeHashCode();
}
public PdlLexerRuleExpressionAlteration(PdlLexerRuleTerm term, PdlLexerRuleExpression expression)
: base(term)
{
Expression = expression;
_hashCode = ComputeHashCode();
}
public PdlLexerRuleExpression(PdlLexerRuleTerm term)
{
Term = term;
_hashCode = ComputeHashCode();
}