public IList <EbnfMessage> Prepare(bool throwIfErrors = true)
{
var result = new List <EbnfMessage>();
var msgs = Validate(false);
result.AddRange(msgs);
var hasError = false;
foreach (var msg in msgs)
{
if (EbnfErrorLevel.Error == msg.ErrorLevel)
{
hasError = true;
break;
}
}
if (!hasError)
{
result.AddRange(DeclareImplicitTerminals());
}
if (throwIfErrors)
{
EbnfException.ThrowIfErrors(result);
}
return(result);
}
public IList <EbnfMessage> Validate(bool throwIfErrors = false)
{
var result = new List <EbnfMessage>();
var refCounts = new Dictionary <string, int>(EqualityComparer <string> .Default);
foreach (var prod in Productions)
{
refCounts.Add(prod.Key, 0);
}
foreach (var prod in Productions)
{
_ValidateExpression(prod.Value.Expression, refCounts, result);
}
foreach (var rc in refCounts)
{
if (0 == rc.Value)
{
var prod = Productions[rc.Key];
object o;
var isHidden = prod.Attributes.TryGetValue("hidden", out o) && o is bool && (bool)o;
if (!isHidden && !Equals(rc.Key, StartProduction))
{
result.Add(new EbnfMessage(EbnfErrorLevel.Warning, 2, string.Concat("Unreferenced production \"", rc.Key, "\""),
prod.Line, prod.Column, prod.Position));
}
}
}
if (throwIfErrors)
{
EbnfException.ThrowIfErrors(result);
}
return(result);
}