// Variable = Name & ? one of defined variables ?
private IParsingProduct ParseVariable(ISourceCode src)
{
using var ctx = src.GetFurtherContext();
var fragment = ParseName(ctx);
if (fragment == null)
{
return(null);
}
var variableNode = _grammarProductsFactory.CreateVariableNode(fragment);
if (variableNode == null)
{
ctx.SetError(ParsingErrors.UndefinedVariable);
return(null);
}
ctx.Accept();
return(variableNode);
}