public Object Read(LocTextReader t)
{
return InnerReader.Read(t);
}
protected 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);
}
public Object Load(LocTextReader t)
{
Object expr = null;
do {
Int32 line = t.Line;
expr = Read(t);
if (!Eof(expr)) {
try {
Eval(expr, GlobalEnvironment);
} catch (Exception ex) {
throw BacktraceException.Push(ex, new BacktraceFrame(new Location(t.File, line), "when evaluating ", expr), this);
}
}
} while (!Eof(expr));
return true;
}
protected 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 LispException("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 LispException("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;
}
protected void EatMultiComment(LocTextReader t)
{
Int32 ch = t.Peek();
while (ch != -1 && ch != '#') {
t.Read();
ch = t.Peek();
}
if (ch == '#')
t.Read();
}
protected 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();
}
//.........................................................................
protected 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);
}
}
public object Read(LocTextReader t)
{
Object result = DoRead(t, false);
if (result is EndDelimiter)
throw new LispException("Read error - read unmatched: " + ((EndDelimiter)result).Delim);
return result;
}
