/// <summary>
/// Creates a visualised grammar based on the definitive grammar passed.
/// </summary>
/// <param name="dGrammarIn"></param>
internal VisualisedGrammar(DefinitiveGrammar dGrammarIn)
{
// obsolete - using vistor pattern
//startSymbol = dGrammarIn.StartSymbol.CreateVisualGrammar(true);
// create visitor
GrammarNodeDCreateVisualVisitor visitor = new GrammarNodeDCreateVisualVisitor();
// traverse tree
dGrammarIn.StartSymbol.accept(visitor);
if (visitor.CurrentNodeV as NonterminalHeadV == null)
throw new Exception("Creating the visualised grammar from the definitive failed.");
startSymbol = (NonterminalHeadV)visitor.CurrentNodeV;
}
public void setDefinitiveGrammar(DefinitiveGrammar dg)
{
definitiveGrammar = dg;
visualisedGrammar = null;
}
/// <summary>
/// Will construct a definitive grammar from an input string, throw exception with compiler error otherwise.
/// Assumes first rule is the start symbol.
/// </summary>
/// <param name="input"></param>
public void setDefinitiveGrammar(String input)
{
bool noError = bnfParser.Parse(input);
if (noError)
{
// no start symbol specified, assume first entry
definitiveGrammar = new DefinitiveGrammar(bnfParser.Rules, bnfParser.Rules[0]);
visualisedGrammar = null;
}
else
{
throw new Exception(bnfParser.ErrorText);
}
}
public GrammarModel(DefinitiveGrammar definitiveGrammarIn)
{
bnfParser = new BNFParser();
definitiveGrammar = definitiveGrammarIn;
}