public static void runfile(string cfun0, TextReader tr0, bool prmpt)
{
ExtendedReader tr = new ExtendedReader(tr0);
Symbol cfun = _ss(cfun0);
while (true)
{
if (prmpt)
{
con.Write(prompt); con.Flush();
}
Object o = aread(tr);
if (o == null)
{
return;
}
try
{
Object result =
apply(cfun,
new Object[] { o });
if (prmpt)
{
con.WriteLine(rprompt + print(result));
con.Flush();
}
}
catch (Exception e)
{
con.WriteLine("Exception " + e + "\nin: \n" + print(o));
con.Flush();
}
}
}
public static void bootfile(string nm, string on)
{
ExtendedReader tr = new ExtendedReader(new StreamReader(nm));
Runtime.xpath = Path.GetDirectoryName(nm);
StreamWriter wr = new StreamWriter(on);
while (true)
{
Object o = Runtime.aread(tr);
if (o == null)
{
wr.Close();
tr.Close();
return;
}
Object result =
Runtime.apply(Symbol.make("read-compile-eval-dump"),
new Object[] { o });
if (result != null)
{
wr.WriteLine(result);
}
}
}
public static Object read(string str)
{
ExtendedReader r = new ExtendedReader(new System.IO.StringReader(str));
Object p = aread(r);
r.Close();
return(p);
}
public static Object eval0(string str)
{
ExtendedReader r = new ExtendedReader(new System.IO.StringReader(str));
Object o = aread(r);
Object result = (Precompiler.compile(o).run(null, null));
return(result);
}
public static Object eval(string str)
{
ExtendedReader r = new ExtendedReader(new System.IO.StringReader(str));
Object o = aread(r);
Object result =
apply(_read_compile_eval,
new Object[] { o });
return(result);
}
public static Object aread(ExtendedReader rdr)
{
if (_areadstr == null)
{
return(Reader.process(Reader.aread(rdr)));
}
else
{
return(apply(_ss(_areadstr), new Object[] { rdr }));
}
}
public static Object meval(string str)
{
Object result = null;
ExtendedReader tr = new ExtendedReader(new System.IO.StringReader(str));
while (true)
{
Object o = aread(tr);
if (o == null)
{
return(result);
}
result =
apply(_read_compile_eval,
new Object[] { o });
}
}
public static Object aread(ExtendedReader r)
{
Object prev_p = null;
Stack top = new Stack();
char[] c = new char[1];
bool rd = true;
bool annotate = r.annotate;
int state = 0;
string s = "";
pospair strt = null;
pospair crnt = null;
System.Collections.Stack st = new System.Collections.Stack();
System.Collections.Stack pos = new System.Collections.Stack();
while (true)
{
char ch;
if (!rd)
{
if (top.Count > 0)
{
return(top.Pop());
}
else
{
return(null);
}
}
int n = r.Read(c, 0, 1);
if (annotate)
{
crnt = new pospair(r.file, r.linepos, r.cpos);
}
if (n == 0)
{
rd = false; // stop
ch = ' '; // simulate end of something
goto cont;
}
ch = c[0]; //Console.Write(ch);
cont:
if (state == 0)
{
switch (ch)
{
case '(':
{
// start a new list;
Pair p = new Pair(null, null);
top.Push(p);
st.Push(p);
pos.Push(0); // will fill car first
prev_p = p;
break;
}
case ')':
{
// pop a list
if (top.Count < 1)
{
throw new
Meta.Scripting.MBaseException(new Pair(Symbol.make("READER-ERROR-AT:"),
prev_p));
}
Object p = top.Pop();
if (p is Pair)
{
Pair pp = (Pair)p;
if (pp.car == null && pp.cdr == null)
{
p = null;
}
}
st.Pop(); // discard it
pos.Pop(); //discard it
if (!popper(st, pos, p))
{
return(p);
}
if (p != null)
{
prev_p = p;
}
state = 0;
break;
}
case '.':
{
s = "" + ch; strt = crnt; state = 6;
break;
}
case ';':
{
state = 4; // comment started
break;
}
case ' ':
case '\n':
case '\t':
case '\r':
case '\f':
{ // just skip
break;
}
case '\"': // start a string literal
{
s = "" + ch; strt = crnt;
state = 2;
break;
}
case '\'':
case '`': // immediate
{
s = "" + ch; strt = crnt;
if (!popper(st, pos, s))
{
return(s);
}
s = "";
break;
}
case ',': // delay
{
s = "" + ch; strt = crnt;
state = 5;
break;
}
case '&': // another delayed reader
{
s = "" + ch; strt = crnt;
state = 7;
break;
}
default: // all other chars starts atoms
{
s = "" + ch; // start a new one;
strt = crnt;
state = 1; // atom processing
break;
}
}
}
else if (state == 1)
{
if (ch == '(' || ch == ')' || Char.IsWhiteSpace(ch) || ch == ';')
{
// atom ends here, sorry
if (annotate)
{
strt.s = s;
if (!popper(st, pos, strt))
{
return(strt);
}
}
else
{
if (!popper(st, pos, s))
{
return(s);
}
}
if (s != null)
{
prev_p = s;
}
s = "";
state = 0;
goto cont; // now process the termination character in a new state
}
else
{
s = s + ch; // add a char to an atom
}
}
else if (state == 2)
{
if (ch == '\\')
{
state = 3;
}
else if (ch == '\"')
{
s = s + ch;
state = 1;
ch = ' '; // simulate an end of atom
goto cont;
}
else
{
s = s + ch;
}
}
else if (state == 3)
{
if (ch == 'n')
{
ch = '\n';
}
else if (ch == 't')
{
ch = '\t';
}
s = s + ch; state = 2;
}
else if (state == 4)
{
if (ch == '\n')
{
state = 0; // comment line finished
}
}
else if (state == 5)
{
if (ch == '@')
{
s += ch;
}
if (!popper(st, pos, s))
{
return(s);
}
state = 0;
if (ch != '@')
{
goto cont; // otherwise read next char
}
}
else if (state == 6)
{
if (ch == '.')
{
s += ch; state = 1;
}
else
{
state = 0;
pos.Pop();
pos.Push(1); // will fill cdr, not a new cons cell
goto cont;
}
}
else if (state == 7)
{
if (ch == '\"')
{
s += ch;
state = 2;
}
else
{
state = 1;
goto cont;
}
}
}
}
