private static int next(PushbackTextReader r)
{
int c = nextConsumed(r);
r.Unread(c);
return(c);
}
private static string readstring(PushbackTextReader r)
{
int first = r.Read();
if (first == -1)
{
throw new ArgumentException(BADEND + ", at line " + r.Line);
}
if (breakstring(first))
{
throw new ArgumentException(BADCHAR + ((char)first) + "', at line " + r.Line);
}
StringBuilder sb = new StringBuilder();
if (first != '\'' && first != '"')
{
r.Unread(first);
first = 0;
}
int c;
while (true)
{
c = r.Read();
if (c == '\\')
{
c = r.Read();
if (c == -1)
{
throw new ArgumentException(BADEND + ", at line " + r.Line);
}
}
else if (first != 0 && c == first)
{
break;
}
else if (first == 0)
{
if (isWhite(c) || c == -1)
{
break;
}
if (breakstring(c))
{
r.Unread(c);
break;
}
}
else if (c == -1)
{
throw new ArgumentException(BADEND + ", at line " + r.Line);
}
sb.Append((char)c);
}
return(sb.ToString());
}
private static int swapComment(PushbackTextReader r)
{
int c;
do
{
c = r.Read();
}while(c != '\n' && c != -1);
return(c);
}
private static int nextConsumed(PushbackTextReader r)
{
int c;
do
{
c = r.Read();
if (c == '#')
{
c = swapComment(r);
}
}while(isWhite(c));
return(c);
}
private static Hashtable readdict(PushbackTextReader r)
{
Hashtable h = new Hashtable();
int c = r.Read();
if (c != '{')
{
throw new ArgumentException(BADCHAR + (char)c + "', at line " + r.Line);
}
while (true)
{
c = next(r);
if (c == '}')
{
r.Read();
break;
}
string key = readstring(r);
c = next(r);
if (c != '=')
{
throw new ArgumentException(BADCHAR + (char)c + "', at line " + r.Line);
}
r.Read();
next(r);
object aValue = readobject(r);
h[key] = aValue;
c = next(r);
if (c == '}')
{
r.Read();
break;
}
if (c == ';' || c == ',')
{
r.Read();
continue;
}
}
return(h);
}
private static byte[] readbytes(PushbackTextReader r)
{
MemoryStream bos = new MemoryStream();
int c = r.Read();
if (c != '<')
{
throw new ArgumentException(BADCHAR + (char)c + "', at line " + r.Line);
}
char[] tab = new char[2];
byte[] outTab = new byte[1];
int Read;
while (true)
{
Read = nextConsumed(r);
if (Read == -1)
{
throw new ArgumentException(BADEND + ", at line " + r.Line);
}
if (Read == '>')
{
break;
}
tab[0] = (char)Read;
Read = nextConsumed(r);
if (Read == -1)
{
throw new ArgumentException(BADEND + ", at line " + r.Line);
}
tab[1] = (char)Read;
outTab[0] = hexaToInt(tab[0], r);
outTab[0] <<= 4;
outTab[0] |= hexaToInt(tab[1], r);
bos.Write(outTab, 0, 1);
}
return(bos.ToArray());
}
private static byte hexaToInt(char c, PushbackTextReader r)
{
int n;
if ('0' <= c && c <= '9')
{
n = c - '0';
}
else if ('a' <= c && c <= 'f')
{
n = c - 'a' + 10;
}
else if ('A' <= c && c <= 'F')
{
n = c - 'A' + 10;
}
else
{
throw new ArgumentException(BADCHAR + (char)c + "', at line " + r.Line);
}
return((byte)n);
}
private static object readobject(PushbackTextReader r)
{
int c = next(r);
switch (c)
{
case -1:
return(null);
case '{':
return(readdict(r));
case '(':
return(readarray(r));
case '<':
return(readbytes(r));
default:
return(readstring(r));
}
}
private static ArrayList readarray(PushbackTextReader r)
{
ArrayList v = new ArrayList();
int c = r.Read();
if (c != '(')
{
throw new ArgumentException(BADCHAR + (char)c + "', at line " + r.Line);
}
while (true)
{
c = next(r);
if (c == ')')
{
r.Read();
break;
}
object item = readobject(r);
v.Add(item);
c = next(r);
if (c == ')')
{
r.Read();
break;
}
if (c == ';' || c == ',')
{
r.Read();
continue;
}
// be tolerant
// throw new ArgumentException(BADCHAR + (char)c + "', at line " + r.Line);
}
return(v);
}
