private void Identifier()
{
while (IsAlphaUnderscoreOrNumeric(Peek()))
{
Advance();
}
// See if the identifier is a reserved word.
string text = Source.Substring(Start, Current - Start);
int? keyword = LoxTokenTypes.Get(text);
if (keyword != null)
{
AddToken(keyword.Value);
}
else if (_PreProcessorDefines.TryGetValue(text, out string replace))
{
SourceBegin(CurrentFile.Path, replace, Line);
// Source = Source.Remove(Start, text.Length).Insert(Start, replace);
// Current = Start;
}
else
{
AddToken(TokenTypes.IDENTIFIER);
}
}
private void PreProcessorDefine()
{
while (Peek() == ' ' || Peek() == '\t')
{
Advance();
}
int nameStart = Current;
while (IsAlphaUnderscoreOrNumeric(Peek()))
{
Advance();
}
// See if the name is a reserved word.
string name = Source.Substring(nameStart, Current - nameStart);
int? keyword = LoxTokenTypes.Get(name);
if (keyword != null)
{
throw new CompilerException(new Token(TokenTypes.ERROR, Line), $"Cannot redefine keyword '{name}'.");
}
while (Peek() == ' ' || Peek() == '\t')
{
Advance();
}
int contentStart = Current;
while (Peek() != '\r' && Peek() != '\n')
{
Advance();
}
string content = Source.Substring(contentStart, Current - contentStart);
_PreProcessorDefines[name] = content;
}
