/// <summary>
/// Output the ANTLR translation of the specified character value node
/// </summary>
protected override void WriteCharValNode(ITree node)
{
var isCaseSensitive = IsCaseSensitive(node);
var text = GetStringValue(node);
var length = text.Length;
if (isCaseSensitive && length > 0)
{
Write("'");
Write(text);
Write("'");
}
else
{
if (length > 1)
{
Write("(");
}
for (int index = 0; index < length; index++)
{
if (index > 0)
{
Write(" ");
}
var upperCharacter = char.ToUpperInvariant(text[index]);
var lowerCharacter = char.ToLowerInvariant(text[index]);
if (upperCharacter == lowerCharacter)
{
Write("'");
Write(AntlrHelper.CharEscape(lowerCharacter));
Write("'");
}
else
{
Write("(");
Write("'");
Write(AntlrHelper.CharEscape(upperCharacter));
Write("'");
Write(" | ");
Write("'");
Write(AntlrHelper.CharEscape(lowerCharacter));
Write("'");
Write(")");
}
}
if (length > 1)
{
Write(")");
}
}
}
void OutputLiteralRules(IDictionary<char, NamedCharacter> literals, TextWriter writer, INamedCharacterLookup lookup)
{
var knownValues =
literals.Values
.Where(x => lookup.IsKnownCharacter(x.Character))
.OrderBy(x => x.Character)
.Select(x => x);
var unknownValues =
literals.Values
.Where(x => !(lookup.IsKnownCharacter(x.Character)))
.OrderBy(x => x.Character)
.Select(x => x);
if (literals.Count > 0)
{
writer.WriteLine("");
writer.WriteLine("");
writer.WriteLine(@"////////////////////////////////////////////////////////////////////////////////////////////");
writer.WriteLine(@"// Lexer rules generated for each distinct character in original grammar");
writer.WriteLine(@"// " + lookup.Description);
writer.WriteLine(@"////////////////////////////////////////////////////////////////////////////////////////////");
writer.WriteLine("");
}
// output known (named) literals first
foreach (var value in knownValues)
{
writer.Write(value.Name);
writer.Write(" : ");
writer.Write("'");
var character = value.Character;
writer.Write(AntlrHelper.CharEscape(character));
writer.Write("'");
writer.WriteLine(";");
}
// output unknown literals
foreach (var value in unknownValues)
{
writer.Write(value.Name);
writer.Write(" : ");
int number = value.Character;
writer.Write(@"'\u");
writer.Write(number.ToString("X4"));
writer.Write("'");
writer.WriteLine(";");
}
}
