private static Name Nexpr = "expr";
private static Name Nfuncall = "funcall";
- private static Name Nvariable = "variable";
+ private static Name Nvarref = "varref";
private static Name Ninteger = "integer";
private static Name Nstring = "string";
private static Name Nsymbol = "symbol";
private static Name Nfname = "fname";
private static Name Nargs = "args";
private static Name Nargs_unevalled = "args-unevalled";
+ private static Name Nfixed = "fixed";
private static Name Noptional = "optional";
private static Name Nrest = "rest";
- private static Name Nbody = "body";
private static Name Ndefvar = "defvar";
+ private static Name Nvname = "vname";
private static Name Ndescription = "description";
private static Name Nrange = "range";
private static Name Nprogn = "progn";
+ private static Name Nloop = "loop";
+ private static Name Nfunction = "function";
internal abstract class Function
{
this.max_arg = max_arg;
}
- public abstract Term Call (Domain domain, Term[] args);
+ public abstract Term Call (Domain domain, Variable vari, Term[] args);
public override string ToString ()
{
internal class Subroutine : Function
{
public Builtin builtin;
+ public bool setvar;
- public Subroutine (Builtin builtin, Name name,
+ public Subroutine (Builtin builtin, Name name, bool setvar,
int min_arg, int max_arg)
: base (name, min_arg, max_arg)
{
this.builtin = builtin;
}
- public override Term Call (Domain domain, Term[] args)
+ public override Term Call (Domain domain, Variable vari, Term[] args)
{
Term[] newargs = new Term[args.Length];
for (int i = 0; i < args.Length; i++)
newargs[i] = args[i].Eval (domain);
- return builtin (domain, newargs);
+ return builtin (domain, vari, newargs);
}
}
this.builtin = builtin;
}
- public override Term Call (Domain domain, Term[] args)
+ public override Term Call (Domain domain, Variable vari, Term[] args)
{
- return builtin (domain, args);
+ return builtin (domain, vari, args);
}
}
internal class Lambda : Function
{
internal bool args_evalled;
- internal Term[] args;
+ internal Variable[] args;
internal Term[] body;
- public Lambda (XmlNode node)
+ public Lambda (XmlNode node, Domain domain)
{
- int nargs = 0, noptions = 0, nrest = 0;
+ int nfixed = 0;
+ int noptional = 0;
+ int nrest = 0;
name = node.Attributes[Nfname].Value;
node = node.FirstChild;
args_evalled = node.Name == Nargs;
for (n = node.FirstChild; n != null; n = n.NextSibling)
{
- if (n.Name != Nsymbol)
- break;
- nargs++;
+ if (n.Name == Nfixed)
+ nfixed++;
+ else if (n.Name == Noptional)
+ noptional++;
+ else if (n.Name == Nrest)
+ nrest++;
+ else
+ throw new Exception ("Invalid argument type: " + n);
}
- if (n != null && n.Name == Noptional)
- for (n = n.NextSibling; n != null; n = n.NextSibling)
- {
- if (n.Name == Nrest)
- break;
- noptions++;
- }
- if (n != null)
- nrest++;
- min_arg = nargs;
- max_arg = nargs + noptions + nrest;
- args = new Term[max_arg];
+ min_arg = nfixed;
+ max_arg = nfixed + noptional + nrest;
+ args = new Variable[max_arg];
n = node.FirstChild;
for (int i = 0; i < max_arg; n = n.NextSibling)
- if (n.Name == Nsymbol)
- args[i++] = new Term (n, null);
+ args[i++] = domain.Defvar ((Name) n.Attributes[0].Value);
if (nrest == 1)
max_arg = - max_arg;
}
public void SetBody (XmlNode node, Domain domain)
{
-
- for (node = node.FirstChild; node != null && node.Name != Nbody;
- node = node.NextSibling);
- if (node != null)
+ for (node = node.FirstChild; node != null; node = node.NextSibling)
+ if (node.Name != Ndescription
+ && node.Name != Nargs
+ && node.Name != Nargs_unevalled)
+ break;
+ int nterms = 0;
+ for (XmlNode n = node; n != null; n = n.NextSibling)
+ nterms++;
+ if (nterms > 0)
{
- XmlNodeList nlist = node.ChildNodes;
-
- body = new Term[nlist.Count];
- for (int i = 0; i < nlist.Count; i++)
- body[i] = new Term (nlist[i], domain);
+ body = new Term[nterms];
+ for (nterms = 0; node != null; node = node.NextSibling, nterms++)
+ body[nterms] = new Term (node, domain);
}
}
- public override Term Call (Domain domain, Term[] args)
+ public override Term Call (Domain domain, Variable vari, Term[] args)
{
Bindings current = domain.bindings;
Term result = Zero;
args = newargs;
}
for (i = 0; i < min_arg; i++)
- {
- Variable vari = domain.GetVar ((Name) this.args[i]);
- domain.Bind (vari, args[i]);
- }
+ domain.Bind (this.args[i], args[i]);
if (body != null)
foreach (Term term in body)
result = term.Eval (domain);
}
}
- internal abstract class Variable
+ public abstract class Variable
{
public readonly Name name;
internal Term val;
}
#endif
+ internal struct CatchTag
+ {
+ public readonly Name name;
+ public readonly int count;
+
+ public CatchTag (Name name, int count)
+ {
+ this.name = name;
+ this.count = count;
+ }
+ }
+
public class Domain
{
public object context;
internal Dictionary<Name, Function> functions;
internal Dictionary<Name, Variable> variables;
internal Bindings bindings;
+ internal Stack<CatchTag> catch_list = new Stack<CatchTag> ();
+ private int catch_count = 0;
internal Domain ()
{
bindings = bindings.UnboundTo (boundary);
}
- public void DefSubr (Builtin builtin, string str,
+ internal void Catch (Name name)
+ {
+ catch_list.Push (new CatchTag (name, catchcount++));
+ }
+
+ internal bool Catched {
+ get { return catch_list.Peek ().count == catchcount; }
+ }
+
+ internal void ThrowReturn ()
+ {
+ catch_list.Peek ().count = catchcount;
+ }
+
+ internal void ThrowBreak ()
+ {
+ catch_list.Peek ().count = catchcount;
+ }
+
+ internal void Uncatch ()
+ {
+ catch_list.Pop ();
+ }
+
+ public void DefSubr (Builtin builtin, string str, bool setvar,
int min_arg, int max_arg, params string[] aliases)
{
Name name = str;
- Function func = new Function.Subroutine (builtin, name,
+ Function func = new Function.Subroutine (builtin, name, setvar,
min_arg, max_arg);
functions[name] = func;
foreach (string a in aliases)
internal Function.Lambda RegisterFunction (XmlNode node)
{
- Function.Lambda lambda = new Function.Lambda (node);
+ Function.Lambda lambda = new Function.Lambda (node, this);
functions[lambda.name] = lambda;
return lambda;
variables[name] = vari;
}
+ internal Variable Defvar (Name name)
+ {
+ Variable vari = new Variable.Misc (name, Zero);
+ variables[name] = vari;
+ return vari;
+ }
+
internal Function GetFunc (Name name)
{
Function func;
}
}
- public delegate Term Builtin (Domain domain, Term[] args);
+ public delegate Term Builtin (Domain domain, Variable vari, Term[] args);
private static Domain basic = new Domain ();
static Xexpression ()
{
- basic.DefSubr (set_value, "set", 2, 2, "=");
+ basic.DefSubr (set_value, "set", true, 1, 1, "=");
+ basic.DefSubr (not, "not", false, 1, 1, "!");
+ basic.DefSubr (add, "add", true, 1, -1, "+");
+ basic.DefSubr (mul, "mul", true, 1, -1, "*");
+ basic.DefSubr (sub, "sub", true, 1, -1, "-");
+ basic.DefSubr (div, "div", true, 1, -1, "/");
+ basic.DefSubr (mod, "mod", true, 1, 2, "%");
+ basic.DefSubr (logior, "logior", true, 1, -1, "|");
+ basic.DefSubr (logand, "logand", true, 1, -1, "&");
+ basic.DefSubr (lsh, "lsh", true, 1, 2, "<<");
+ basic.DefSubr (rsh, "rsh", true, 1, 2, ">>");
+ basic.DefSubr (eq, "eq", false, 2, -1, "==");
+ basic.DefSubr (noteq, "noteq", false, 2, 2, "!=");
+ basic.DefSubr (less_than, "lt", false, 2, -1, "<");
+ basic.DefSubr (less_eq, "le", false, 2, -1, "<=");
+ basic.DefSubr (greater_than, "gt", false, 2, -1, ">");
+ basic.DefSubr (greater_eq, "ge", false, 2, -1, ">=");
+ basic.DefSubr (append, "append", true, 0, -1);
+ basic.DefSubr (concat, "concat", true, 0, -1);
+ basic.DefSubr (nth, "nth", false, 2, 2);
+ basic.DefSubr (copy, "copy", false, 1, 1);
+ basic.DefSubr (ins, "ins", true, 2, 2);
+ basic.DefSubr (del, "del", true, 2, 2);
+ basic.DefSubr (eval_clause, "eval", false, 1, 1);
+ basic.DefSubr (break_clause, "break", false, 0, 1);
+ basic.DefSubr (return_clause, "return", false, 1, 1);
basic.DefSpecial (and, "and", 1, -1, "&&");
basic.DefSpecial (or, "or", 1, -1, "||");
- basic.DefSubr (not, "not", 1, 1, "!");
- basic.DefSubr (add, "add", 2, -1, "+");
- basic.DefSubr (mul, "mul", 2, -1, "*");
- basic.DefSubr (sub, "sub", 1, -1, "-");
- basic.DefSubr (div, "div", 2, -1, "/");
- basic.DefSubr (mod, "mod", 2, 2, "%");
- basic.DefSubr (logior, "logior", 2, -1, "|");
- basic.DefSubr (logand, "logand", 2, -1, "&");
- basic.DefSubr (add_set, "add-set", 2, -1, "+=");
- basic.DefSubr (mul_set, "mul-set", 2, -1, "*=");
- basic.DefSubr (sub_set, "sub-set", 2, -1, "-=");
- basic.DefSubr (div_set, "div-set", 2, -1, "/=");
- basic.DefSubr (mod_set, "mod-set", 2, 2, "%=");
- basic.DefSubr (logior_set, "logior-set", 2, -1, "|=");
- basic.DefSubr (logand_set, "logand-set", 2, -1, "&=");
- basic.DefSubr (lsh, "lsh", 2, 2, "<<");
- basic.DefSubr (rsh, "rsh", 2, 2, ">>");
- basic.DefSubr (lsh_set, "lsh-set", 2, 2, "<<=");
- basic.DefSubr (rsh_set, "rsh-set", 2, 2, ">>=");
- basic.DefSubr (eq, "eq", 2, -1, "==");
- basic.DefSubr (noteq, "noteq", 2, 2, "!=");
- basic.DefSubr (less_than, "lt", 2, -1, "<");
- basic.DefSubr (less_eq, "le", 2, -1, "<=");
- basic.DefSubr (greater_than, "gt", 2, -1, ">");
- basic.DefSubr (greater_eq, "ge", 2, -1, ">=");
- basic.DefSubr (append, "append", 0, -1);
- basic.DefSubr (concat, "concat", 0, -1);
- basic.DefSubr (nth, "nth", 2, 2);
- basic.DefSubr (copy, "copy", 1, 1);
- basic.DefSubr (ins, "ins", 3, 3);
- basic.DefSubr (del, "del", 3, 3);
- basic.DefSubr (eval_clause, "eval", 1, 1);
- basic.DefSpecial (quote_clause, "quote", 1, 1);
basic.DefSpecial (progn_clause, "progn", 0, -1, "expr");
basic.DefSpecial (if_clause, "if", 2, 3);
basic.DefSpecial (when_clause, "when", 1, -1);
+ basic.DefSpecial (loop_clause, "loop", 1, -1);
basic.DefSpecial (while_clause, "while", 1, -1);
basic.DefSpecial (cond_clause, "cond", 1, -1);
- basic.DefSpecial (foreach_clause, "foreach", 3, -1);
+ basic.DefSpecial (foreach_clause, "foreach", 2, -1);
+ basic.DefSpecial (quote_clause, "quote", 1, 1);
+ basic.DefSpecial (type_clause, "type", 1, 1);
Fprogn = basic.GetFunc (Nprogn);
}
- private static Term set_value (Domain domain, Term[] args)
+ private static Term set_value (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar ((Name) args[0]);
-
- vari.Value = args[1];
+ vari.Value = args[0];
return vari.val;
}
- private static Term and (Domain domain, Term[] args)
- {
- foreach (Term arg in args)
- if (! arg.Eval (domain).IsTrue)
- return Zero;
- return One;
- }
-
- private static Term or (Domain domain, Term[] args)
- {
- foreach (Term arg in args)
- if (arg.Eval (domain).IsTrue)
- return One;
- return Zero;
- }
-
- private static Term not (Domain domain, Term[] args)
+ private static Term not (Domain domain, Variable vari, Term[] args)
{
return args[0].IsTrue ? Zero : One;
}
- private static Term add (Domain domain, Term[] args)
+ private static Term add (Domain domain, Variable vari, Term[] args)
{
- int n = 0;
+ int n = vari == null ? 0 : vari.val.Intval;
+
foreach (Term arg in args)
n += (int) arg;
- return n;
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
+ return vari.val;
}
- private static Term mul (Domain domain, Term[] args)
+ private static Term mul (Domain domain, Variable vari, Term[] args)
{
- int n = 1;
+ int n = vari == null ? 1 : vari.val.Intval;
foreach (Term arg in args)
n *= (int) arg;
- return n;
- }
-
- private static Term sub (Domain domain, Term[] args)
- {
- int n = (int) args[0];
- if (args.Length == 1)
- return - n;
- for (int i = 1; i < args.Length; i++)
- n -= (int) args[i];
- return n;
- }
-
- private static Term div (Domain domain, Term[] args)
- {
- int n = (int) args[0];
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i];
- return n;
- }
-
- private static Term mod (Domain domain, Term[] args)
- {
- return ((int) args[0] % (int) args[1]);
- }
-
- private static Term logior (Domain domain, Term[] args)
- {
- int n = 0;
- foreach (Term arg in args)
- n |= (int) arg;
- return n;
- }
-
- private static Term logand (Domain domain, Term[] args)
- {
- int n = (int) args[0];
- for (int i = 1; i < args.Length; i++)
- n &= (int) args[i];
- return n;
- }
-
- private static Term add_set (Domain domain, Term[] args)
- {
- Variable vari = domain.GetVar ((Name) args[0]);
- int n = (int) vari.val;
-
- for (int i = 1; i < args.Length; i++)
- n += (int) args[i];
- vari.val = n;
- return vari.val;
- }
-
- private static Term mul_set (Domain domain, Term[] args)
- {
- Variable vari = domain.GetVar ((Name) args[0]);
- int n = (int) vari.val;
-
- for (int i = 1; i < args.Length; i++)
- n *= (int) args[i];
- vari.val = n;
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
return vari.val;
}
- private static Term sub_set (Domain domain, Term[] args)
+ private static Term sub (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar ((Name) args[0]);
- int n = (int) vari.val;
+ int n, i;
- for (int i = 1; i < args.Length; i++)
- n -= (int) args[i];
- vari.val = n;
+ if (vari == null)
+ {
+ n = args[0].Intval;
+ i = 1;
+ }
+ else
+ {
+ n = vari.val.Intval;
+ i = 0;
+ }
+ while (i < args.Length)
+ n -= (int) args[i++];
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
return vari.val;
}
- private static Term div_set (Domain domain, Term[] args)
+ private static Term div (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar ((Name) args[0]);
- int n = (int) vari.val;
+ int n, i;
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i];
- vari.val = n;
+ if (vari == null)
+ {
+ n = args[0].Intval;
+ i = 1;
+ }
+ else
+ {
+ n = vari.val.Intval;
+ i = 0;
+ }
+ while (i < args.Length)
+ n /= args[i++].Intval;
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
return vari.val;
}
- private static Term mod_set (Domain domain, Term[] args)
+ private static Term mod (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar ((Name) args[0]);
- int n = (int) vari.val;
-
- for (int i = 1; i < args.Length; i++)
- n %= (int) args[i];
- vari.val = n;
+ if (vari == null)
+ return (args[0].Intval % args[1].Intval);
+ vari.val.intval = vari.val.Intval % args[0].Intval;
return vari.val;
}
- private static Term logior_set (Domain domain, Term[] args)
+ private static Term logior (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar ((Name) args[0]);
- int n = (int) vari.val;
-
- for (int i = 1; i < args.Length; i++)
- n |= (int) args[i];
- vari.val = n;
+ int n = vari == null ? 0 : vari.val.Intval;
+ foreach (Term arg in args)
+ n |= (int) arg;
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
return vari.val;
}
- private static Term logand_set (Domain domain, Term[] args)
+ private static Term logand (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar ((Name) args[0]);
- int n = (int) vari.val;
+ int n, i;
- for (int i = 1; i < args.Length; i++)
- n &= (int) args[i];
- vari.val = n;
+ if (vari == null)
+ {
+ n = args[0].Intval;
+ i = 1;
+ }
+ else
+ {
+ n = vari.val.Intval;
+ i = 0;
+ }
+ while (i < args.Length)
+ n &= (int) args[i++];
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
return vari.val;
}
- private static Term lsh (Domain domain, Term[] args)
- {
- return (int) args[0] << (int) args[1];
- }
-
- private static Term lsh_set (Domain domain, Term[] args)
+ private static Term lsh (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar ((Name) args[0]);
- int n = (int) vari.val;
-
- n <<= (int) args[1];
- vari.val = n;
+ if (vari == null)
+ return args[0].Intval << args[1].Intval;
+ vari.val.intval = vari.val.Intval << args[0].Intval;
return vari.val;
}
- private static Term rsh (Domain domain, Term[] args)
- {
- return (int) args[0] >> (int) args[1];
- }
-
- private static Term rsh_set (Domain domain, Term[] args)
+ private static Term rsh (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar ((Name) args[0]);
- int n = (int) vari.val;
-
- n >>= (int) args[1];
- vari.val = n;
+ if (vari == null)
+ return args[0].Intval >> args[1].Intval;
+ vari.val.intval = vari.val.Intval >> args[0].Intval;
return vari.val;
}
- private static Term eq (Domain domain, Term[] args)
+ private static Term eq (Domain domain, Variable vari, Term[] args)
{
Term o = args[0];
return One;
}
- private static Term noteq (Domain domain, Term[] args)
+ private static Term noteq (Domain domain, Variable vari, Term[] args)
{
- return eq (domain, args);
+ return eq (domain, vari, args);
}
- private static Term less_than (Domain domain, Term[] args)
+ private static Term less_than (Domain domain, Variable vari, Term[] args)
{
int n = (int) args[0];
return One;
}
- private static Term less_eq (Domain domain, Term[] args)
+ private static Term less_eq (Domain domain, Variable vari, Term[] args)
{
int n = (int) args[0];
for (int i = 1; i < args.Length; i++)
return One;
}
- private static Term greater_than (Domain domain, Term[] args)
+ private static Term greater_than (Domain domain, Variable vari, Term[] args)
{
int n = (int) args[0];
for (int i = 1; i < args.Length; i++)
return One;
}
- private static Term greater_eq (Domain domain, Term[] args)
+ private static Term greater_eq (Domain domain, Variable vari, Term[] args)
{
int n = (int) args[0];
for (int i = 1; i < args.Length; i++)
return One;
}
- private static Term append (Domain domain, Term[] args)
+ private static Term append (Domain domain, Variable vari, Term[] args)
{
- List<Term> list = new List<Term> ();
- Term result;
+ List<Term> list;
+
+ if (vari == null)
+ list = new List<Term> ();
+ else
+ list = vari.val.Listval;
foreach (Term arg in args)
{
else
list.Add (arg);
}
- result.intval = 0;
- result.objval = list;
- return result;
+ if (vari == null)
+ {
+ Term result;
+ result.intval = 0;
+ result.objval = list;
+ return result;
+ }
+ vari.val.objval = list;
+ return vari.val;
}
- private static Term concat (Domain domain, Term[] args)
+ private static Term concat (Domain domain, Variable vari, Term[] args)
{
- string str = "";
- Term result;
+ string str;
+
+ if (vari == null)
+ str = "";
+ else
+ str = vari.val.Strval;
foreach (Term arg in args)
{
else
str += (char) arg.Intval;
}
- result.intval = 0;
- result.objval = str;
- return result;
+ if (vari == null)
+ {
+ Term result;
+ result.intval = 0;
+ result.objval = str;
+ return result;
+ }
+ vari.val.objval = str;
+ return vari.val;
}
- private static Term nth (Domain domain, Term[] args)
+ private static Term nth (Domain domain, Variable vari, Term[] args)
{
Term result;
return result;
}
- private static Term copy (Domain domain, Term[] args)
+ private static Term copy (Domain domain, Variable vari, Term[] args)
{
Term result;
return result;
}
- private static Term ins (Domain domain, Term[] args)
+ private static Term ins (Domain domain, Variable vari, Term[] args)
{
- if (args[0].IsStr)
- {
- string str = args[0].Strval.Insert (args[1].Intval, args[2].Strval);
- args[0].objval = str;
- }
- else if (args[0].IsList)
- {
- args[0].Listval.InsertRange (args[1].Intval, args[2].Listval);
- }
+ if (vari.val.IsStr)
+ vari.val.objval
+ = vari.val.Strval.Insert (args[0].Intval, args[1].Strval);
+ else if (vari.val.IsList)
+ vari.val.Listval.InsertRange (args[0].Intval, args[1].Listval);
else
- throw new Exception ("term is not collection: " + args[0]);
- return args[0];
+ throw new Exception ("term is not collection: " + vari.val);
+ return vari.val;
}
-
- private static Term del (Domain domain, Term[] args)
+ private static Term del (Domain domain, Variable vari, Term[] args)
{
- if (args[0].IsStr)
- {
- string str = args[0].Strval.Remove (args[1].Intval,
- args[2].Intval - args[1].Intval);
- args[0].objval = str;
- }
- else if (args[0].IsList)
- {
- args[0].Listval.RemoveRange (args[1].Intval,
- args[2].Intval - args[1].Intval);
- }
+ if (vari.val.IsStr)
+ vari.val.objval
+ = vari.val.Strval.Remove (args[0].Intval,
+ args[1].Intval - args[0].Intval);
+
+ else if (vari.val.IsList)
+ vari.val.Listval.RemoveRange (args[0].Intval,
+ args[1].Intval - args[0].Intval);
else
- throw new Exception ("term is not collection: " + args[0]);
- return args[0];
+ throw new Exception ("term is not collection: " + vari.val);
+ return vari.val;
}
- private static Term quote_clause (Domain domain, Term[] args)
+ private static Term and (Domain domain, Variable vari, Term[] args)
{
- return new Term (args[0]);
+ foreach (Term arg in args)
+ if (! arg.Eval (domain).IsTrue)
+ return Zero;
+ return One;
+ }
+
+ private static Term or (Domain domain, Variable vari, Term[] args)
+ {
+ foreach (Term arg in args)
+ if (arg.Eval (domain).IsTrue)
+ return One;
+ return Zero;
}
- private static Term eval_clause (Domain domain, Term[] args)
+ private static Term eval_clause (Domain domain, Variable vari, Term[] args)
{
return (args[0].Eval (domain));
}
- private static Term progn_clause (Domain domain, Term[] args)
+ private static Term progn_clause (Domain domain, Variable vari, Term[] args)
{
Term result = One;
return result;
}
- private static Term if_clause (Domain domain, Term[] args)
+ private static Term if_clause (Domain domain, Variable vari, Term[] args)
{
if (args[0].Eval (domain).IsTrue)
return args[1].Eval (domain);
return args[2].Eval (domain);
}
- private static Term when_clause (Domain domain, Term[] args)
+ private static Term when_clause (Domain domain, Variable vari, Term[] args)
{
if (! args[0].Eval (domain).IsTrue)
return Zero;
return result;
}
- private static Term while_clause (Domain domain, Term[] args)
+ private static Term break_clause (Domain domain, Variable vari, Term[] args)
+ {
+ Stack<CatchTag> clist = domain.catch_list;
+ if (clist.Count == 0)
+ throw new Exception ("No outer loop to break");
+ CatchTag tag = clist.Peek ();
+ if (tag.name != Nloop)
+ throw new Exception ("No outer loop to break");
+ domain.depth = tag.depth;
+ return args.Length == 0 ? Zero : args[0];
+ }
+
+ private static Term return_clause (Domain domain, Variable vari, Term[] args)
+ {
+ Stack<CatchTag> clist = domain.catch_list;
+
+ while (clist.Count > 0)
+ {
+ CatchTag tag = clist.Pop ();
+ if (tag.name == Nfunction)
+ {
+ domain.depth = tag.depth;
+ return = args.Length == 0 ? Zero : args[0];
+ }
+ }
+ return args.Length == 0 ? Zero : args[0];
+ }
+
+ private static Term loop_clause (Domain domain, Variable vari, Term[] args)
+ {
+ domain.Catch (Nloop);
+ Term result = Zero;
+ try {
+ while (! domain.Catched)
+ foreach (Term arg in args)
+ {
+ result = arg.Eval (domain);
+ if (domain.Catched)
+ break;
+ }
+ } finally {
+ domain.Uncatch ();
+ }
+ return result;
+ }
+
+ private static Term while_clause (Domain domain, Variable vari, Term[] args)
{
while (args[0].Eval (domain).IsTrue)
for (int i = 1; i < args.Length; i++)
return Zero;
}
- private static Term cond_clause (Domain domain, Term[] args)
+ private static Term cond_clause (Domain domain, Variable vari, Term[] args)
{
foreach (Term arg in args)
{
return Zero;
}
- private static Term foreach_clause (Domain domain, Term[] args)
+ private static Term foreach_clause (Domain domain, Variable vari,
+ Term[] args)
{
- Variable vari = domain.GetVar ((Name) args[0]);
- List<Term> list = args[1].Listval;
+ List<Term> list = args[0].Listval;
Bindings current = domain.bindings;
foreach (Term term in list)
{
domain.Bind (vari, term);
try {
- for (int i = 2; i < args.Length; i++)
+ for (int i = 1; i < args.Length; i++)
args[i].Eval (domain);
} finally {
domain.UnboundTo (current);
return Zero;
}
+ private static Term quote_clause (Domain domain, Variable vari, Term[] args)
+ {
+ return new Term (args[0]);
+ }
+
+ private static Term type_clause (Domain domain, Variable vari, Term[] args)
+ {
+ if (args[0].IsInt)
+ return TermInt;
+ if (args[0].IsStr)
+ return TermStr;
+ if (args[0].IsName)
+ return TermName;
+ if (args[0].IsList)
+ return TermList;
+ return TermTerm;
+ }
public struct Term
{
objval = (Name) node.InnerText;
else if (name == Nstring)
objval = node.InnerText.Clone ();
- else if (name == Nvariable)
+ else if (name == Nvarref)
objval = domain.GetVar ((Name) node.Attributes[0].Value);
else if (name == Nlist)
{
}
else
{
+ Function func;
+ Variable vari = null;
+ Term[] args;
+
if (name == Nfuncall)
name = node.Attributes[0].Value;
-
- Function func = domain.GetFunc (name);
+ else if (node.Attributes[Nvname] != null)
+ vari = domain.GetVar (node.Attributes[Nvname].Value);
+ func = domain.GetFunc (name);
XmlNodeList nlist = node.ChildNodes;
int nargs = nlist.Count;
|| (func.max_arg >= 0 && nargs > func.max_arg))
throw new Exception ("Invalid number of arguments to: "
+ name + " " + nargs);
- Term[] args = new Term[nargs];
+ args = new Term[nargs];
for (int i = 0; i < nlist.Count; i++)
args[i] = new Term (nlist[i], domain);
- objval = new Funcall (func, args);
+ objval = new Funcall (func, vari, args);
}
}
}
private class Funcall
{
internal Function func;
+ internal Variable vari;
internal Term[] args;
- public Funcall (Function func, Term[] args)
+ public Funcall (Function func, Variable vari, Term[] args)
{
this.func = func;
+ this.vari = vari;
this.args = args;
}
domain.DebugWrite (false, " {0}", args[i].ToString ());
domain.DebugWrite (false, ")");
domain.depth++;
- Term result = func.Call (domain, args);
+ Term result = func.Call (domain, vari, args);
domain.depth--;
domain.DebugWrite (true, " ==> {0})", result.ToString ());
return result;
}
public bool IsInt { get { return (objval == null); } }
public bool IsStr { get { return (objval is string); } }
+ public bool IsName { get { return (objval is Name); } }
public bool IsList { get { return (objval is List<Term>); } }
public Term Eval (Domain domain)
static Term Zero = new Term (0);
static Term One = new Term (1);
+ static Term TermInt = new Term (Ninteger);
+ static Term TermStr = new Term (Nstring);
+ static Term TermName = new Term (Nsymbol);
+ static Term TermList = new Term (Nlist);
+ static Term TermTerm = new Term ((Name) "term");
internal static int parse_integer (string str)
{
projects / m17n / m17n-lib-cs.git / blobdiff