/** For references to tokens rather than by label such as $ID, we
* need to get the existing label for the ID ref or create a new
* one.
*/
public virtual string GetElementLabel(string refdSymbol,
int outerAltNum,
CodeGenerator generator)
{
GrammarAST uniqueRefAST;
if (Grammar.type != GrammarType.Lexer &&
Rule.GetRuleType(refdSymbol) == RuleType.Lexer)
{
// symbol is a token
IList <GrammarAST> tokenRefs = GetTokenRefsInAlt(refdSymbol, outerAltNum);
uniqueRefAST = tokenRefs[0];
}
else
{
// symbol is a rule
IList <GrammarAST> ruleRefs = GetRuleRefsInAlt(refdSymbol, outerAltNum);
uniqueRefAST = ruleRefs[0];
}
if (uniqueRefAST.code == null)
{
// no code? must not have gen'd yet; forward ref
return(null);
}
string labelName = null;
string existingLabelName =
(string)uniqueRefAST.code.GetAttribute("label");
// reuse any label or list label if it exists
if (existingLabelName != null)
{
labelName = existingLabelName;
}
else
{
// else create new label
labelName = generator.CreateUniqueLabel(refdSymbol);
CommonToken label = new CommonToken(ANTLRParser.ID, labelName);
if (Grammar.type != GrammarType.Lexer &&
Rule.GetRuleType(refdSymbol) == Tool.RuleType.Lexer)
{
Grammar.DefineTokenRefLabel(Name, label, uniqueRefAST);
}
else
{
Grammar.DefineRuleRefLabel(Name, label, uniqueRefAST);
}
uniqueRefAST.code.SetAttribute("label", labelName);
}
return(labelName);
}
/** For references to tokens rather than by label such as $ID, we
* need to get the existing label for the ID ref or create a new
* one.
*/
public virtual string GetElementLabel( string refdSymbol,
int outerAltNum,
CodeGenerator generator )
{
GrammarAST uniqueRefAST;
if ( grammar.type != GrammarType.Lexer &&
char.IsUpper( refdSymbol[0] ) )
{
// symbol is a token
IList tokenRefs = GetTokenRefsInAlt( refdSymbol, outerAltNum );
uniqueRefAST = (GrammarAST)tokenRefs[0];
}
else
{
// symbol is a rule
IList ruleRefs = GetRuleRefsInAlt( refdSymbol, outerAltNum );
uniqueRefAST = (GrammarAST)ruleRefs[0];
}
if ( uniqueRefAST.code == null )
{
// no code? must not have gen'd yet; forward ref
return null;
}
string labelName = null;
string existingLabelName =
(string)uniqueRefAST.code.GetAttribute( "label" );
// reuse any label or list label if it exists
if ( existingLabelName != null )
{
labelName = existingLabelName;
}
else
{
// else create new label
labelName = generator.CreateUniqueLabel( refdSymbol );
CommonToken label = new CommonToken( ANTLRParser.ID, labelName );
if ( grammar.type != GrammarType.Lexer &&
char.IsUpper( refdSymbol[0] ) )
{
grammar.DefineTokenRefLabel( Name, label, uniqueRefAST );
}
else
{
grammar.DefineRuleRefLabel( Name, label, uniqueRefAST );
}
uniqueRefAST.code.SetAttribute( "label", labelName );
}
return labelName;
}
