internal Object Read(LocTextReader t)
{
return reader.Read(t);
}
internal Object readSymbolOrNumber(LocTextReader t, Int32 ch, Boolean firstInForm)
{
StringBuilder b = new StringBuilder();
b.Append((Char)ch);
Boolean complete = false;
while (!complete)
{
ch = t.Peek();
if (ch == -1)
complete = true;
else if (Char.IsWhiteSpace((Char)ch))
complete = true;
else
{
ReaderMacro rm = (ReaderMacro)macroTable[(Char)ch];
if (rm != null && rm.isTerminating)
complete = true;
else
{
t.Read();
b.Append((Char)ch);
}
}
}
return parseSymbolOrNumber(b.ToString(), firstInForm);
}
internal Object Load(LocTextReader t)
{
Object expr = null;
do
{
Int32 line = t.line;
expr = Read(t);
if (!Eof(expr))
{
try
{
eval(expr, globalenv);
}
catch (Exception ex)
{
throw BacktraceException.push(ex,
new BacktraceFrame(new Loc(t.file, line), "when evaluating ", expr), this);
}
}
} while (!Eof(expr));
return true;
}
internal Cons readDelimitedList(LocTextReader t, Int32 delim)
{
Cons ret = null;
Cons tail = null;
Int32 ch = t.Peek();
while (Char.IsWhiteSpace((Char)ch))
{
t.Read();
ch = t.Peek();
}
while (ch != delim)
{
Object o = doRead(t, delim == ')' && ret == null);
if (eof(o))
{
throw new Exception("Read error - eof found before matching: "
+ (Char)delim + "\n File: " + t.file + ", line: " + t.line);
}
EndDelimiter ed = o as EndDelimiter;
if (ed != null)
{
if (ed.delim == delim)
{
return ret;
}
else
throw new Exception("Read error - read unmatched: " + ed.delim
+ "\n File: " + t.file + ", line: " + t.line);
}
Cons link = new Cons(o, null);
if (delim == ')' && ret == null && o is CompositeSymbol)
{
ret = ((CompositeSymbol)o).symbolAsList;
tail = ret.rest;
}
else if (ret == null)
{
ret = tail = link;
}
else
{
tail.rest = link;
tail = link;
}
ch = t.Peek();
while (Char.IsWhiteSpace((Char)ch))
{
t.Read();
ch = t.Peek();
}
}
//eat delim
t.Read();
return ret;
}
internal object Read(LocTextReader t)
{
Object result = doRead(t, false);
if (result is EndDelimiter)
throw new Exception("Read error - read unmatched: " + ((EndDelimiter)result).delim);
return result;
}
internal void eatMultiComment(LocTextReader t)
{
Int32 ch = t.Peek();
while (ch != -1 && ch != '#')
{
t.Read();
ch = t.Peek();
}
if (ch == '#')
t.Read();
}
internal void eatComment(LocTextReader t)
{
Int32 ch = t.Peek();
while (ch != -1 && ch != '\n' && ch != '\r')
{
t.Read();
ch = t.Peek();
}
if (ch != -1 && ch != '\n' && ch != '\r')
t.Read();
}
internal Object doRead(LocTextReader t, Boolean firstInForm)
{
Int32 ch = t.Read();
while (Char.IsWhiteSpace((Char)ch))
{
ch = t.Read();
}
if (ch == -1)
{
//return null;
//return Symbol.EOF;
return EOF_MARKER;
}
if (ch == '#')
{
eatMultiComment(t);
return doRead(t, firstInForm);
}
if (ch == ';')
{
eatComment(t);
return doRead(t, firstInForm);
}
ReaderMacro rm = (ReaderMacro)macroTable[(Char)ch];
if (rm != null)
{
return rm.func(t, (Char)ch);
}
else
{
return readSymbolOrNumber(t, ch, firstInForm);
}
}