public void Load(GrammarDocumentGroup documentGroup)
{
if (documentGroup.Items == null)
{
throw new ArgumentException("Grammar documents not loaded", "documentGroup");
}
CheckGrammar(documentGroup);
BuildSymbols(documentGroup);
}
static int Main(string[] args)
{
if (args.Length == 0)
{
Console.WriteLine("Please provide the grammar folder argument");
return((int)ReturnValue.InvalidArgument);
}
string grammarFolder = args[0];
GrammarDocumentGroup.SchemaPath = "Schema.xsd";
var documentGroup = new GrammarDocumentGroup();
bool success = documentGroup.LoadWithValidation(grammarFolder, (sender, e) =>
{
string severity;
switch (e.Severity)
{
case XmlSeverityType.Error:
severity = "Error";
break;
case XmlSeverityType.Warning:
severity = "Warning";
break;
default:
severity = "UnknownSeverityType";
break;
}
Console.WriteLine(severity + ": " + e.Message + $" ({e.Exception.Source})");
});
if (!success)
{
Console.WriteLine("Schema validation doesn't pass");
return((int)ReturnValue.InvalidGrammar);
}
var grammar = new Grammar();
try
{
grammar.Load(documentGroup);
}
catch (AggregateException pack)
{
foreach (Exception e in pack.InnerExceptions)
{
Console.WriteLine("Error: " + e.Message);
}
return((int)ReturnValue.InvalidGrammar);
}
Console.WriteLine(grammar.ToText());
return(0);
}
private void BuildSymbols(GrammarDocumentGroup documentGroup)
{
_symbols = new Dictionary <SymbolId, Symbol>();
SymbolId startId = _idGenerator.Next();
_start = new NonTerminalSymbol(startId, ReservedCharacter + "Start");
_symbols.Add(startId, _start);
foreach (GrammarDocument document in documentGroup.Items)
{
foreach (XmlElement element in document.Content.DocumentElement.ChildNodes)
{
BuildSymbol(element);
}
}
}
private void CheckGrammar(GrammarDocumentGroup documentGroup)
{
var exceptions = new List <Exception>();
foreach (GrammarDocument document in documentGroup.Items)
{
foreach (XmlElement element in document.Content.GetElementsByTagName("Production"))
{
if (element.HasAttribute("output_order"))
{
string[] tokens = element.Attributes["output_order"].Value.Split(' ');
if (tokens.Length != element.ChildNodes.Count)
{
throw new IllegalOutputOrderException(document.Path);
}
var found = new bool[tokens.Length];
for (int i = 0; i < tokens.Length; i++)
{
if (int.TryParse(tokens[i], out int number) && number < tokens.Length && !found[number])
{
found[number] = true;
}
else
{
throw new IllegalOutputOrderException(document.Path);
}
}
}
}
}
bool hasTopSymbol = false;
var symbolRefs = new Dictionary <string, SymbolId>();
var idGenerator = new SymbolId.Generator();
void checkSymbolsByTagName(string tagName)
{
foreach (GrammarDocument document in documentGroup.Items)
{
foreach (XmlElement element in document.Content.GetElementsByTagName(tagName))
{
if (element.HasAttribute("name"))
{
string name = element.Attributes["name"].Value;
if (symbolRefs.ContainsKey(name))
{
exceptions.Add(new SymbolRedefinitionException(document.Path, name));
}
else
{
symbolRefs.Add(name, idGenerator.Next());
}
}
if (element.HasAttribute("top") && XmlConvert.ToBoolean(element.Attributes["top"].Value))
{
hasTopSymbol = true;
}
}
}
}
checkSymbolsByTagName("Terminal");
checkSymbolsByTagName("Symbol");
foreach (GrammarDocument document in documentGroup.Items)
{
foreach (XmlElement element in document.Content.GetElementsByTagName("SymbolRef"))
{
Debug.Assert(element.HasAttribute("name"));
string name = element.Attributes["name"].Value;
if (!symbolRefs.ContainsKey(name))
{
exceptions.Add(new SymbolRefNotFoundException(document.Path, name));
}
}
}
if (!hasTopSymbol)
{
exceptions.Add(new Exception("Grammar has no top level symbol"));
}
if (exceptions.Count > 0)
{
throw new AggregateException(exceptions);
}
_symbolRefs = symbolRefs;
_idGenerator = idGenerator;
}