private IEnumerable <FileLine> Prepocess()
{
string s;
newLine:
while ((s = reader.ReadLine()) != null)
{
var ss = s;
lineNumber++;
if (!insideComment)
{
var idx = s.IndexOf("/*");
if (idx > -1)
{
ss = s.Substring(0, idx);
insideComment = true;
}
}
else
{
var idx = s.IndexOf("*/");
if (idx > -1)
{
ss = s.Substring(idx + 2);
insideComment = false;
}
else
{
continue;
}
}
var commentIdx = ss.IndexOf("//");
if (commentIdx > -1)
{
ss = ss.Substring(0, commentIdx);
}
if (ss.Trim().StartsWith("#"))
{
ss = ss.TrimStart();
//Parse preprocessor
if (ss.Trim() == "#endif")
{
supress = false;
wasIf = false;
}
if (ss.Trim() == "#else")
{
if (wasIf)
{
supress = !supress;
}
else
{
throw new FormatException(string.Format("Unmatched #else in {0} line {1}", fileName, lineNumber));
}
}
if (supress)
{
goto newLine;
}
if (ss.StartsWith("#ifdef"))
{
var m = s.Substring("#ifdef".Length + 1);
supress = !macros.ContainsKey(m);
wasIf = true;
}
if (ss.StartsWith("#ifndef"))
{
var m = s.Substring("#ifndef".Length + 1);
supress = macros.ContainsKey(m);
wasIf = true;
}
if (ss.StartsWith("#undef"))
{
var m = s.Substring("#undef".Length + 1);
macros.Remove(m);
}
if (ss.StartsWith("#define"))
{
var macro = new MacroDef
{
Line = lineNumber,
File = fileName
};
var block = ss.Substring("#define".Length + 1);
while (block.EndsWith("\\"))
{
ss = reader.ReadLine();
block = block.TrimEnd('\\') + ss;
lineNumber++;
}
var m = defineParser.Match(block);
if (!m.Success)
{
throw new FormatException(string.Format("Error parsing define at {0} line {1}", fileName, lineNumber));
}
macro.Name = m.Groups["name"].Value;
macro.Body = m.Groups["body"].Value;
macro.Parameters = m.Groups["params"].Value.Split(',').Select(p => p.Trim()).Where(p => !string.IsNullOrEmpty(p)).ToArray();
macro.Prepare();
macros[macro.Name] = macro;
}
if (ss.StartsWith("#include"))
{
var f = ss.Substring("#include".Length + 1).Trim('"', ' ', '<', '>');
var l = lookupFile(fileName, f);
var p = new Preprocessor(l.Item1, l.Item2, lookupFile, macros);
foreach (var x in p.Prepocess())
{
yield return(x);
}
}
continue;
}
if (supress)
{
goto newLine;
}
if (s.Length > 0)
{
yield return(new FileLine(fileName, lineNumber, PreprocessLine(s)));
}
}
}
public static IEnumerable <FileLine> Prepocess(string fileName, TextReader reader, Func <string, string, Tuple <string, TextReader> > lookupFile)
{
var p = new Preprocessor(fileName, reader, lookupFile, new Dictionary <string, MacroDef>());
return(p.Prepocess());
}