private void PrintTermCase(ITerminalSet firstSet)
{
var tokens = SetAsTokenDefinitions(firstSet);
foreach (var token in tokens)
{
PrintLine($"case TokenKind.{token}:");
}
}
public void Union(ITerminalSet terminalSet, bool includeEpsilon = true)
{
foreach (var term in terminalSet.AsEnumerable())
{
if ((term != Epsilon) || (term == Epsilon && includeEpsilon))
{
_terminals.Add(term);
}
}
}
private void PrintFirstSet(ITerminalSet firstSet, string nodeId)
{
var tokens = SetAsTokenDefinitions(firstSet);
PrintLine($"var firstSetOf{nodeId} = new[]");
PrintLine("{");
Indent();
PrintLine(string.Join(", ", tokens.Select(s => "TokenKind." + s)));
Outdent();
PrintLine("};");
}
private void PrintKleene(ITerminalSet firstSet, string nodeId)
{
if (firstSet.AsEnumerable().Count() > 1)
{
PrintFirstSet(firstSet, nodeId);
PrintLine($"while (firstSetOf{nodeId}.Contains(_scanner.CurrentToken.TokenKind))");
}
else
{
var defs = SetAsTokenDefinitions(firstSet);
PrintLine($"while (_scanner.CurrentToken.TokenKind == TokenKind.{defs.First()})");
}
PrintLine("{");
Indent();
}
private List <string> SetAsTokenDefinitions(ITerminalSet firstSet)
{
var tokens = new List <string>();
foreach (var token in firstSet.AsEnumerable().Where(t => t != "$EPSILON$"))
{
var tokenDef = _tokens.FirstOrDefault(p => p.Image.Equals(token))?.Definition;
if (tokenDef == null)
{
throw new SemanticErrorException($"Token definition for \"{token}\" not found.");
}
tokens.Add(tokenDef);
}
return(tokens);
}
