2 using System.Collections;
3 using System.Collections.Generic;
5 using System.Reflection;
10 public static class Xexpression
12 private static int trace_depth = 0;
14 public static int TraceDepth {
15 get { return trace_depth; }
16 set { trace_depth = value; }
19 public class Error : System.Exception
22 // System.OutOfMemoryException or System.InsufficientMemoryException
23 public static Symbol MemoryError = "memory-error";
25 public static Symbol UnknownError = "unknown-error";
26 public static Symbol WrongArgument = "wrong-argument";
29 public static Symbol InvalidInteger = "invalid-integer";
30 public static Symbol TermTypeInvalid = "term-type-invalid";
31 public static Symbol FunctionConflict = "function-conflict";
32 public static Symbol VariableTypeConfclit = "variable-type-conflict";
33 public static Symbol VariableRangeConfclit = "variable-range-conflict";
34 public static Symbol VariableWrongRange = "variable-wrong-range";
35 public static Symbol VariableWrongValue = "variable-wrong-value";
36 public static Symbol UnknownFunction = "unknown-function";
37 public static Symbol MacroExpansionError = "macro-expansion-error";
38 public static Symbol NoVariableName = "no-variable-anme";
41 public static Symbol ArithmeticError = "arithmetic-error";
42 public static Symbol WrongType = "wrong-type";
43 public static Symbol IndexOutOfRange = "index-out-of-range";
44 public static Symbol ValueOutOfRange = "value-out-of-range";
45 public static Symbol NoLoopToBreak = "no-loop-to-break";
46 public static Symbol UncaughtThrow = "uncaught-throw";
48 private readonly Symbol name;
49 private Term term = Zero;
52 public Error (Symbol name, XmlNode node, string fmt, params object[] args)
53 : base (String.Format (fmt, args))
59 public Error (Symbol name, string fmt, params object[] args)
60 : base (String.Format (fmt, args))
65 public Symbol ErrorName { get { return name; } }
66 public XmlNode ErrorNode { get { return node; } set { node = value; } }
67 public Term ErrorTerm { get { return term; } set { term = value; } }
70 public struct Symbol : IEquatable<Symbol>
72 private static NameTable nt = new NameTable ();
76 public Symbol (string str) { name = nt.Add (str); }
78 public static implicit operator Symbol (string str)
80 return new Symbol (str);
83 public static implicit operator string (Symbol sym) { return sym.name; }
85 public static bool operator== (Symbol n1, Symbol n2)
87 return (object) n1.name == (object) n2.name;
90 public static bool operator!= (Symbol n1, Symbol n2)
92 return (object) n1.name != (object) n2.name;
95 public static bool operator== (Symbol n1, string n2)
97 return (object) n1.name == (object) n2;
100 public static bool operator!= (Symbol n1, string n2)
102 return (object) n1.name != (object) n2;
105 public static bool operator== (string n1, Symbol n2)
107 return (object) n1 == (object) n2.name;
110 public static bool operator!= (string n1, Symbol n2)
112 return (object) n1 != (object) n2.name;
115 public bool Equals (Symbol name)
117 return Object.ReferenceEquals (this.name, name.name);
120 public override bool Equals (object obj)
122 return (obj is Symbol ? this == (Symbol) obj
123 : obj is string ? this.name == (string) obj
127 public override int GetHashCode ()
129 return name.GetHashCode ();
132 public static NameTable NameTable { get { return nt; } }
134 public override string ToString () { return name; }
137 private static Symbol Qexpr = "expr";
139 private static Symbol Qnull = "";
140 private static Symbol Qfuncall = "funcall";
141 private static Symbol Qinteger = "integer";
142 private static Symbol Qstring = "string";
143 private static Symbol Qsymbol = "symbol";
144 private static Symbol Qlist = "list";
146 public static Symbol Qdefun = "defun";
147 public static Symbol Qdefmacro = "defmacro";
148 private static Symbol Qfname = "fname";
149 private static Symbol Qargs = "args";
150 private static Symbol Qfixed = "fixed";
151 private static Symbol Qoptional = "optional";
152 private static Symbol Qrest = "rest";
154 public static Symbol Qdefvar = "defvar";
155 private static Symbol Qvname = "vname";
156 private static Symbol Qdescription = "description";
157 private static Symbol Qrange = "range";
159 private static Symbol Qename = "ename";
161 public class Variable
163 public Domain domain;
164 public readonly Symbol name;
167 public Variable (Domain domain, Symbol name, Term val)
169 this.domain = domain;
174 public Term Value { get { return val; } }
176 public virtual Term SetValue (Term val) { this.val = val; return val; }
178 public virtual Variable Clone (Domain domain)
180 return new Variable (domain, name, val);
183 public virtual void Reset () { val = Zero; }
185 public override string ToString () { return name + "(" + val + ")"; }
187 public abstract class Typed : Variable
189 protected string desc;
190 private Term default_val;
192 protected Typed (Domain domain, Symbol name, Term val, string desc)
193 : base (domain, name, val)
199 public override void Reset () { val = default_val; }
201 public string Description {
203 set { desc = value; }
206 public override Term SetValue (Term val)
208 if (! CheckValue (val))
209 throw new Error (Error.VariableWrongValue,
210 "Wrong value for variable {0}: {1}",
216 public abstract bool CheckValue (Term val);
219 public class Int : Typed
223 public void IsSubrange (int[] r)
227 for (int i = 0; i < r.Length; i += 2)
230 for (j = 0; j < range.Length; j += 2)
231 if (range[j] <= r[i] && range[j + 1] >= r[i + 1])
233 if (j >= range.Length)
239 public Int (Domain domain, Symbol name, int n, string desc, int[] range)
240 : base (domain, name, new Term (n), desc)
242 if (range != null && range.Length % 2 == 1)
243 throw new Error (Error.VariableWrongRange,
244 "Range length for {0} not even", name);
249 public override bool CheckValue (Term term)
256 for (int i = 0; i < range.Length; i += 2)
257 if (range[i] <= n && range[i + 1] >= n)
263 public override Variable Clone (Domain domain)
265 return new Int (domain, name, val.Intval, desc, range);
268 public int[] Range { get { return range; } set { range = value; } }
271 public class Str : Typed
273 private string[] range;
275 public bool IsSubrange (string[] r)
279 for (int i = 0; i < r.Length; i++)
282 for (j = 0; j < range.Length; j++)
283 if (range[j] == r[i])
285 if (j >= range.Length)
291 public Str (Domain domain, Symbol name, string str, string desc,
293 : base (domain, name, new Term (str), desc)
299 public override bool CheckValue (Term val)
305 string str = term.Strval;
306 foreach (string s in range)
313 public override Variable Clone (Domain domain)
315 return new Str (domain, name, val.Strval, desc, range);
318 public string[] Range { get { return range; } set { range = value; } }
321 public class Sym : Typed
323 public Symbol[] range;
325 public bool IsSubrange (Symbol[] r)
329 for (int i = 0; i < r.Length; i++)
332 for (j = 0; j < range.Length; j++)
333 if (range[j] == r[i])
335 if (j >= range.Length)
341 public Sym (Domain domain, Symbol name, Symbol sym, string desc,
343 : base (domain, name, new Term (sym), desc)
349 public override bool CheckValue (Term val)
355 Symbol sym = term.Symval;
356 foreach (Symbol n in range)
363 public override Variable Clone (Domain domain)
365 return new Sym (domain, name, val.Symval, desc, range);
368 public Symbol[] Range { get { return range; } set { range = value; } }
372 public abstract class Function
375 // True iff the function can be called with vname="VNAME" attribute.
376 internal readonly bool with_var;
377 // Minimum number of positional arguments.
378 internal readonly int min_args;
379 // If non-nengative, maximum number of arguments. If negative,
380 // maxinum number of positional arguments is (-1 - max_args),
381 // and the remaining unlimit number of arguments are given as a
383 internal readonly int max_args;
385 public Function () { }
387 public Function (Symbol name, bool with_var, int min_args, int max_args)
390 this.with_var = with_var;
391 this.min_args = min_args;
392 this.max_args = max_args;
395 public abstract Term Call (Domain domain, Variable vari, Term[] args);
397 public override string ToString ()
402 internal class Subroutine : Function
404 public Func<Domain, Variable, Term[], Term> builtin;
406 public Subroutine (Func<Domain, Variable, Term[], Term> builtin,
407 Symbol name, bool with_var,
408 int min_args, int max_args)
409 : base (name, with_var, min_args, max_args)
411 this.builtin = builtin;
414 public override Term Call (Domain domain, Variable vari, Term[] args)
418 args = (Term[]) args.Clone ();
419 for (int i = 0; i < args.Length; i++)
421 args[i] = args[i].Eval (domain);
422 if (domain.Thrown ())
426 return builtin (domain, vari, args);
430 internal class SpecialForm : Function
432 public Func<Domain, Variable, Term[], Term> builtin;
434 public SpecialForm (Func<Domain, Variable, Term[], Term> builtin,
435 Symbol name, bool with_var,
436 int min_args, int max_args)
437 : base (name, with_var, min_args, max_args)
439 this.builtin = builtin;
442 public override Term Call (Domain domain, Variable vari, Term[] args)
444 return builtin (domain, vari, args);
448 internal class Lambda : Function
450 private Variable[] args;
453 public Lambda (Symbol name, int min_args, int max_args, Variable[] args,
455 : base (name, false, min_args, max_args)
461 public void SetBody (Term[] body)
466 public override Term Call (Domain domain, Variable vari, Term[] args)
468 Bindings current = domain.bindings;
470 int limit = max_args >= 0 ? args.Length : args.Length - 1;
472 for (int i = 0; i < limit; i++)
474 result = args[i].Eval (domain);
477 domain.Bind (this.args[i], result);
481 List<Term> list = new List<Term> ();
482 list.InsertRange (0, args[result].Listval);
484 for (int i = 0; i < list.Count; i++)
486 result = list[i].Eval (domain);
491 domain.Bind (this.args[limit], new Term (list));
493 domain.Catch (CatchTag.Return);
494 foreach (Term term in body)
496 result = term.Eval (domain);
497 if (domain.Thrown ())
501 domain.UnboundTo (current);
506 internal class Macro : Function
508 private Variable[] args;
511 public Macro (Symbol name, int min_args, int max_args, Variable[] args,
513 : base (name, false, min_args, max_args)
519 public void SetBody (Term[] body)
524 public override Term Call (Domain domain, Variable vari, Term[] args)
526 Bindings current = domain.bindings;
529 for (int i = 0; i < args.Length; i++)
530 domain.Bind (this.args[i], args[i]);
531 domain.Catch (CatchTag.Return);
532 foreach (Term term in body)
534 result = term.Eval (domain);
535 if (domain.Thrown ())
539 domain.UnboundTo (current);
545 internal class Bindings
547 private Variable vari;
548 private Term old_value;
549 private Bindings next;
551 private Bindings (Variable vari)
554 old_value = vari.Value;
557 public static Bindings Bind (Bindings bindings, Variable vari, Term val)
559 Bindings b = new Bindings (vari);
566 internal Bindings UnboundTo (Bindings boundary)
568 for (Bindings b = this; b != boundary; b = b.next)
569 b.vari.Value = b.old_value;
573 public override string ToString ()
575 string str = "(bindings";
576 for (Bindings b = this; b != null; b = b.next)
577 str += " " + vari.name + "=" + b.old_value;
582 internal struct CatchTag
586 // Normal symbolic catch-tag.
587 public CatchTag (Symbol sym) { tag = new Term (sym); }
589 public CatchTag (Symbol sym, string msg) { tag = new Term (sym, msg); }
591 public CatchTag (ErrorTerm e) { tag = new Term (e); }
592 // Special catch-tag.
593 private CatchTag (int i) { tag = new Term (i); }
595 public Term Tag { get { return tag; } }
597 public static CatchTag Return = new CatchTag (0);
598 public static CatchTag Break = new CatchTag (1);
604 public object context;
605 public int depth = 0;
606 private Stack<Term> call_stack = new Stack<Term> ();
608 internal Dictionary<Symbol, MethodInfo> termtypes
609 = new Dictionary<Symbol, MethodInfo> ();
610 internal Dictionary<Symbol, Function> functions
611 = new Dictionary<Symbol, Function> ();
612 internal Dictionary<Symbol, Function.Macro> macros
613 = new Dictionary<Symbol, Function.Macro> ();
614 internal Dictionary<Symbol, Variable> variables
615 = new Dictionary<Symbol, Variable> ();
616 internal Bindings bindings;
617 private Stack<CatchTag> catch_stack = new Stack<CatchTag> ();
618 private int catch_count = 0;
620 internal Domain (Symbol name) { this.name = name; }
622 public Domain (Symbol name, object context)
623 : this (name, basic, context) { }
625 public Domain (Symbol name, Domain parent, object context) : this (name)
627 termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
628 functions = new Dictionary<Symbol, Function> (parent.functions);
629 macros = new Dictionary<Symbol, Function.Macro> (parent.macros);
630 variables = new Dictionary<Symbol, Variable> (parent.variables);
631 this.context = context;
634 public int CallStackCount { get { return call_stack.Count; } }
636 public void CallStackPush (Term term)
638 call_stack.Push (term);
641 public void CallStackPop ()
646 public void CallStackPop (int count)
648 while (count < call_stack.Count)
652 internal void Bind (Variable vari, Term value)
654 bindings = Bindings.Bind (bindings, vari, value);
657 internal void UnboundTo (Bindings boundary)
659 if (bindings != null)
660 bindings = bindings.UnboundTo (boundary);
663 internal void Catch (CatchTag tag)
665 catch_stack.Push (tag);
669 internal void Uncatch ()
672 if (catch_count > catch_stack.Count)
676 public bool Thrown () { return catch_count < catch_stack.Count; }
678 public bool Thrown (out bool caught)
680 if (catch_count < catch_stack.Count)
682 caught = catch_count == catch_stack.Count - 1;
689 internal void ThrowReturn ()
691 foreach (CatchTag elt in catch_stack)
694 if (elt.Tag == CatchTag.Return.Tag)
699 internal bool ThrowBreak ()
701 if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
707 internal void ThrowSymbol (Term tag)
709 foreach (CatchTag elt in catch_stack)
712 if (elt.Tag.Matches (tag))
717 internal Term ThrowError (Term tag)
720 ErrorTerm e = tag.objval as ErrorTerm;
721 e.CallStack = call_stack.ToArray ();
723 foreach (CatchTag elt in catch_stack)
726 if (elt.Tag.Matches (tag))
732 public void DefType (Type type)
734 if (! type.IsSubclassOf (typeof (TermValue)))
735 throw new Error (Error.TermTypeInvalid,
736 "Not a subclass of TermValue: {0}", type);
737 BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
738 FieldInfo finfo = type.GetField ("name", flags);
739 if (finfo == null || finfo.FieldType != typeof (Symbol))
740 throw new Error (Error.TermTypeInvalid,
741 "No \"name\" field of string type: {0}", type);
742 Symbol name = (Symbol) finfo.GetValue (null);
743 if (termtypes.ContainsKey (name)
744 || functions.ContainsKey (name)
745 || macros.ContainsKey (name))
746 throw new Error (Error.TermTypeInvalid,
747 "Already defined: {0}", name);
748 Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
749 MethodInfo minfo = type.GetMethod ("Parser", types);
750 if (minfo == null || minfo.ReturnType != typeof (TermValue))
751 throw new Error ("No \"Parser\" method of correct type: {0}", type);
752 termtypes[name] = minfo;
755 static void check_func_head (Symbol name, bool with_var,
756 int min_args, int max_args)
758 if (termtypes.ContainsKey (name))
759 throw new Error (Error.FunctionConflict,
760 "Already defined as a term type: {0}", name);
761 else if (macros.ContainsKey (name))
762 throw new Error (Error.FunctionConflict,
763 "Already defihed as a macro: {0}", name);
765 if (functions.TryGetValue (name, out func)
766 && (func.with_var != with_var
767 || func.min_args != min_args
768 || func.max_args != max_args))
769 throw new Error (Error.FunctionConflict,
770 "Conflicting arguments: {0}", name);
773 public void DefSubr (Func<Domain, Variable, Term[], Term> builtin,
774 Symbol name, bool with_var,
775 int min_args, int max_args)
777 check_func_head (name, with_var, min_args, max_args);
778 functions[name] = new Function.Subroutine (builtin, name, with_var,
782 public void DefSpecial (Func<Domain, Variable, Term[], Term> builtin,
783 Symbol name, bool with_var,
784 int min_args, int max_args)
786 check_func_head (name, with_var, min_args, max_args);
787 functions[name] = new Function.SpecialForm (builtin, name, with_var,
791 public void Defun (Symbol name, int min_arg, int max_arg,
792 Variable[] args, Term[] body)
794 check_func_head (name, false, min_args, max_args);
795 functions[name] = new Function.Lambda (name, min_args, max_args,
799 public void Defun (Function func)
801 functions[func.name] = func;
804 public void Defmacro (Symbol name, int min_arg, int max_arg,
805 Variable[] args, Term[] body)
807 if (termtypes.ContainsKey (name))
808 throw new Error (Error.FunctionConflict,
809 "Already defined as a term type: {0}", name);
810 else if (function.ContainsKey (name))
811 throw new Error (Error.FunctionConflict,
812 "Already defihed as a function: {0}", name);
813 Function.Macro macro;
814 if (macros.TryGetValue (name, out macro)
815 && (macro.min_args != min_args
816 || macro.max_args != max_args))
817 throw new Error (Error.FunctionConflict,
818 "Conflicting arguments: {0}", name);
819 macros[name] = new Function.Macro (name, min_arg, max_arg, args, body);
822 public void DefAlias (Symbol alias, Symbol fname)
825 if (termtypes.TryGetValue (alias, out func))
826 throw new Error (Error.FunctionConflict,
827 "Alread defined as a term type: {0}", alias);
828 if (functions.TryGetValue (alias, out func))
829 throw new Error (Error.FunctionConflict,
830 "Alread defined as a function: {0}", alias);
831 if (macros.TryGetValue (alias, out func))
832 throw new Error (Error.FunctionConflict,
833 "Alread defined as a macro: {0}", alias);
834 if (! functions.TryGetValue (fname, out func))
835 throw new Error (Error.UnknownFunction, fname);
836 functions[alias] = func;
839 public Variable Defvar (Variable vari)
841 vari = vari.Clone (this);
842 variables[vari.name] = vari;
846 internal Variable Defvar (Symbol name)
848 Variable vari = new Variable (this, name, Zero);
849 variables[name] = vari;
853 public Variable DefvarInt (Symbol name, int n, string desc, int[] range)
857 if (variables.TryGetValue (name, out vari))
859 Variable.Int intvari = vari as Variable.Int;
861 throw new Error (Error.VariableTypeConfclit,
862 "Not an integer variable: {0}", name);
865 if (! intvari.IsSubrange (range))
866 throw new Error (Error.VariableRangeConfclit,
867 "Conflicting variable range: {0}", name);
868 intvari.Range = range;;
871 intvari.Description = desc;
875 vari = new Variable.Int (this, name, n, desc, range);
876 variables[name] = vari;
881 public Variable DefvarStr (Symbol name, string str, string desc,
886 if (variables.TryGetValue (name, out vari))
888 Variable.Str strvari = vari as Variable.Str;
890 throw new Error (Error.VariableTypeConflict,
891 "Not a string variable: {0}", name);
894 if (! strvari.IsSubrange (range))
895 throw new Error (Error.VariableRangeConflict,
896 "Conflicting variable range: {0}", name);
897 strvari.Range = range;
900 strvari.Description = desc;
904 vari = new Variable.Str (this, name, str, desc, range);
905 variables[name] = vari;
910 public Variable DefvarSym (Symbol name, Symbol sym, string desc,
915 if (variables.TryGetValue (name, out vari))
917 Variable.Sym symvari = vari as Variable.Sym;
919 throw new Error (Error.VariableTypeConflict,
920 "Not a symbol variable: {0}", name);
923 if (! symvari.IsSubrange (range))
924 throw new Error (Error.VariableRangeConflict,
925 "Conflicting variable range: {0}", name);
926 symvari.Range = range;
929 symvari.Description = desc;
933 vari = new Variable.Sym (this, name, sym, desc, range);
934 variables[name] = vari;
939 internal Function GetFunc (Symbol name)
943 if (! functions.TryGetValue (name, out func))
944 throw new Error (Error.UnknownFunction,
945 "Unknown function: {0}", name);
949 public bool CopyFunc (Domain domain, Symbol name)
951 Function func = GetFunc (name);
953 domain.functions[name] = func;
957 public void CopyFunc (Domain domain)
959 foreach (KeyValuePair<Symbol, Function> kv in functions)
960 domain.functions[kv.Key] = kv.Value;
963 public Variable GetVar (Symbol name, bool create)
967 if (! variables.TryGetValue (name, out vari))
971 variables[name] = vari = new Variable (this, name, Zero);
976 public override string ToString ()
978 string str = "<(functions";
979 foreach (KeyValuePair<Symbol, Function> kv in functions)
981 str += ") (variabls";
982 foreach (KeyValuePair<Symbol, Variable> kv in variables)
983 str += " " + kv.Value;
985 if (bindings != null)
986 str += " " + bindings;
988 str += " (" + context + ")";
993 internal void TraceWrite (string fmt, params string[] arg)
995 if (trace_depth > depth)
997 for (int i = 0; i < depth; i++)
999 Console.WriteLine (fmt, arg);
1003 public object SaveValues ()
1005 Dictionary<Variable,Term> values = new Dictionary<Variable,Term> ();
1007 foreach (KeyValuePair<Symbol,Variable> kv in variables)
1008 values[kv.Value] = kv.Value.Value.Clone ();
1012 public void RestoreValues (object values)
1014 foreach (KeyValuePair<Variable,Term> kv
1015 in (Dictionary<Variable,Term>) values)
1016 kv.Key.Value = kv.Value;
1020 private static Domain basic = new Domain ("basic");
1022 static Xexpression ()
1024 basic.DefType (typeof (Varref));
1025 basic.DefType (typeof (Funcall));
1026 basic.DefType (typeof (ErrorTerm));
1028 basic.DefSubr (Fset, "set", true, 1, 1);
1029 basic.DefAlias ("=", "set");
1030 basic.DefSubr (Fnot, "not", false, 1, 1);
1031 basic.DefAlias ("!", "not");
1032 basic.DefSubr (Fadd, "add", true, 1, -1);
1033 basic.DefAlias ("+", "add");
1034 basic.DefSubr (Fmul, "mul", true, 1, -1);
1035 basic.DefAlias ("*", "mul");
1036 basic.DefSubr (Fsub, "sub", true, 1, -1);
1037 basic.DefAlias ("-", "sub");
1038 basic.DefSubr (Fdiv, "div", true, 1, -1);
1039 basic.DefAlias ("/", "div");
1040 basic.DefSubr (Fmod, "mod", true, 1, 2);
1041 basic.DefAlias ("%", "mod");
1042 basic.DefSubr (Flogior, "logior", true, 1, -1);
1043 basic.DefAlias ("|", "logior");
1044 basic.DefSubr (Flogand, "logand", true, 1, -1);
1045 basic.DefAlias ("&", "logand");
1046 basic.DefSubr (Flsh, "lsh", true, 1, 2);
1047 basic.DefAlias ("<<", "lsh");
1048 basic.DefSubr (Frsh, "rsh", true, 1, 2);
1049 basic.DefAlias (">>", "rsh");
1050 basic.DefSubr (Feq, "eq", false, 2, -1);
1051 basic.DefAlias ("==", "eq");
1052 basic.DefSubr (Fnoteq, "noteq", false, 2, 2);
1053 basic.DefAlias ("!=", "noteq");
1054 basic.DefSubr (Flt, "lt", false, 2, -1);
1055 basic.DefAlias ("<", "lt");
1056 basic.DefSubr (Fle, "le", false, 2, -1);
1057 basic.DefAlias ("<=", "le");
1058 basic.DefSubr (Fgt, "gt", false, 2, -1);
1059 basic.DefAlias (">", "gt");
1060 basic.DefSubr (Fge, "ge", false, 2, -1);
1061 basic.DefAlias (">=", "ge");
1063 basic.DefSubr (Fappend, "append", true, 0, -1);
1064 basic.DefSubr (Fconcat, "concat", true, 0, -1);
1065 basic.DefSubr (Fnth, "nth", false, 2, 2);
1066 basic.DefSubr (Fcopy, "copy", false, 1, 1);
1067 basic.DefSubr (Fins, "ins", true, 2, 2);
1068 basic.DefSubr (Fdel, "del", true, 2, 2);
1069 basic.DefSubr (Feval, "eval", false, 1, 1);
1070 basic.DefSubr (Fbreak, "break", false, 0, 1);
1071 basic.DefSubr (Freturn, "return", false, 0, 1);
1072 basic.DefSubr (Fthrow, "throw", false, 1, 2);
1074 basic.DefSpecial (Fand, "and", false, 1, -1);
1075 basic.DefAlias ("&&", "and");
1076 basic.DefSpecial (For, "or", false, 1, -1);
1077 basic.DefAlias ("||", "or");
1078 basic.DefSpecial (Fprogn, "progn", false, 0, -1);
1079 basic.DefAlias ("expr", "progn");
1080 basic.DefSpecial (Fif, "if", false, 2, 3);
1081 basic.DefSpecial (Fwhen, "when", false, 1, -1);
1082 basic.DefSpecial (Floop, "loop", false, 1, -1);
1083 basic.DefSpecial (Fwhile, "while", false, 1, -1);
1084 basic.DefSpecial (Fcond, "cond", false, 1, -1);
1085 basic.DefSpecial (Fforeach, "foreach", true, 2, -1);
1086 basic.DefSpecial (Fquote, "quote", false, 1, 1);
1087 basic.DefSpecial (Ftype, "type", false, 1, 1);
1088 basic.DefSpecial (Fcatch, "catch", true, 2, -1);
1091 private static Term Fset (Domain domain, Variable vari, Term[] args)
1094 return new Term (new ErrorTerm (Error.NoVariableName,
1095 "No variable name to set"));
1096 vari.SetValue (args[0]);
1100 private static Term Fnot (Domain domain, Variable vari, Term[] args)
1102 return args[0].IsTrue ? Zero : One;
1105 static Term maybe_set_intvar (Variable vari, int n)
1107 Term term = new Term (n);
1109 vari.SetValue (term);
1114 private static Term Fadd (Domain domain, Variable vari, Term[] args)
1116 int n = vari == null ? 0 : vari.Value.Intval;
1118 foreach (Term arg in args)
1120 return maybe_set_intvar (vari, n);
1123 private static Term Fmul (Domain domain, Variable vari, Term[] args)
1125 int n = vari == null ? 1 : vari.Value.Intval;
1126 foreach (Term arg in args)
1128 return maybe_set_intvar (vari, n);
1131 private static Term Fsub (Domain domain, Variable vari, Term[] args)
1142 n = vari.Value.Intval;
1145 while (i < args.Length)
1146 n -= args[i++].Intval;
1147 return maybe_set_intvar (vari, n);
1150 private static Term Fdiv (Domain domain, Variable vari, Term[] args)
1161 n = vari.Value.Intval;
1164 while (i < args.Length)
1165 n /= args[i++].Intval;
1166 return maybe_set_intvar (vari, n);
1169 private static Term Fmod (Domain domain, Variable vari, Term[] args)
1171 return maybe_set_intvar (vari, args[0].Intval % args[1].Intval);
1174 private static Term Flogior (Domain domain, Variable vari, Term[] args)
1176 int n = vari == null ? 0 : vari.Value.Intval;
1177 foreach (Term arg in args)
1179 return maybe_set_intvar (vari, n);
1182 private static Term Flogand (Domain domain, Variable vari, Term[] args)
1193 n = vari.Value.Intval;
1196 while (i < args.Length)
1197 n &= args[i++].Intval;
1198 return maybe_set_intvar (vari, n);
1201 private static Term Flsh (Domain domain, Variable vari, Term[] args)
1203 return maybe_set_intvar (vari, args[0].Intval << args[1].Intval);
1206 private static Term Frsh (Domain domain, Variable vari, Term[] args)
1208 return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval);
1211 private static Term Feq (Domain domain, Variable vari, Term[] args)
1215 if (o.objval == null)
1217 for (int i = 1; i < args.Length; i++)
1218 if (args[i].objval != null || args[i].intval != o.intval)
1223 for (int i = 1; i < args.Length; i++)
1224 if (o.objval.Equals (args[i].objval))
1230 private static Term Fnoteq (Domain domain, Variable vari, Term[] args)
1232 return Feq (domain, vari, args);
1235 private static Term Flt (Domain domain, Variable vari, Term[] args)
1237 int n = args[0].Intval;
1239 for (int i = 1; i < args.Length; i++)
1241 int n1 = args[i].Intval;
1249 private static Term Fle (Domain domain, Variable vari, Term[] args)
1251 int n = args[0].Intval;
1252 for (int i = 1; i < args.Length; i++)
1254 int n1 = args[i].Intval;
1262 private static Term Fgt (Domain domain, Variable vari, Term[] args)
1264 int n = args[0].Intval;
1265 for (int i = 1; i < args.Length; i++)
1267 int n1 = args[i].Intval;
1275 private static Term Fge (Domain domain, Variable vari, Term[] args)
1277 int n = args[0].Intval;
1278 for (int i = 1; i < args.Length; i++)
1280 int n1 = args[i].Intval;
1288 private static Term Fappend (Domain domain, Variable vari, Term[] args)
1293 list = new List<Term> ();
1295 list = vari.Value.Listval;
1297 foreach (Term arg in args)
1300 list.AddRange ((List<Term>) arg.objval);
1308 result.objval = list;
1314 private static Term Fconcat (Domain domain, Variable vari, Term[] args)
1321 str = vari.Value.Strval;
1323 foreach (Term arg in args)
1326 str += (string) arg.objval;
1327 else if (arg.IsList)
1328 foreach (Term term in (List<Term>) arg.objval)
1329 str += (char) term.Intval;
1331 str += (char) arg.Intval;
1334 Term strterm = new Term (str);
1336 vari.SetValue (strterm);
1340 private static Term Fnth (Domain domain, Variable vari, Term[] args)
1346 result.intval = ((string) args[1].objval)[args[0].Intval];
1347 result.objval = null;
1349 else if (args[1].IsList)
1351 result = ((List<Term>) args[1].objval)[args[0].Intval];
1354 throw new Error (Error.WrongType,
1355 "Not a string nor a list: {0}", args[1]);
1359 private static Term Fcopy (Domain domain, Variable vari, Term[] args)
1364 result.objval = new List<Term> (args[0].Listval);
1368 private static Term Fins (Domain domain, Variable vari, Term[] args)
1371 throw new Error (Error.NoVariableName, "No variable name to set");
1372 Term term = vari.Value;
1374 term.objval = term.Strval.Insert (args[0].Intval, args[1].Strval);
1375 else if (vari.Value.IsList)
1376 vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval);
1378 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1383 private static Term Fdel (Domain domain, Variable vari, Term[] args)
1386 throw new Error (Error.NoVariableName, "No variable name to set");
1387 Term term = vari.Value;
1389 term.objval = term.Strval.Remove (args[0].Intval,
1390 args[1].Intval - args[0].Intval);
1391 else if (vari.Value.IsList)
1392 vari.Value.Listval.RemoveRange (args[0].Intval,
1393 args[1].Intval - args[0].Intval);
1395 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1400 private static Term Fand (Domain domain, Variable vari, Term[] args)
1402 foreach (Term arg in args)
1403 if (! arg.Eval (domain).IsTrue)
1408 private static Term For (Domain domain, Variable vari, Term[] args)
1410 foreach (Term arg in args)
1411 if (arg.Eval (domain).IsTrue)
1416 private static Term Feval (Domain domain, Variable vari, Term[] args)
1418 return (args[0].Eval (domain));
1421 private static Term Fprogn (Domain domain, Variable vari, Term[] args)
1425 foreach (Term arg in args)
1426 result = arg.Eval (domain);
1430 private static Term Fif (Domain domain, Variable vari, Term[] args)
1432 if (args[0].Eval (domain).IsTrue)
1433 return args[1].Eval (domain);
1434 if (args.Length == 2)
1436 return args[2].Eval (domain);
1439 private static Term Fwhen (Domain domain, Variable vari, Term[] args)
1441 if (! args[0].Eval (domain).IsTrue)
1444 for (int i = 1; i < args.Length; i++)
1445 result = args[i].Eval (domain);
1449 private static Term Freturn (Domain domain, Variable vari, Term[] args)
1451 domain.ThrowReturn ();
1452 return args.Length == 0 ? Zero : args[0];
1455 private static Term Fbreak (Domain domain, Variable vari, Term[] args)
1457 if (! domain.ThrowBreak ())
1458 return domain.ThrowError (new Term (Error.NoLoopToBreak, null));
1459 return args.Length == 0 ? Zero : args[0];
1462 private static Term Floop (Domain domain, Variable vari, Term[] args)
1466 domain.Catch (CatchTag.Break);
1467 while (! domain.Thrown ())
1468 foreach (Term arg in args)
1470 result = arg.Eval (domain);
1471 if (domain.Thrown ())
1480 private static Term Fwhile (Domain domain, Variable vari, Term[] args)
1484 domain.Catch (CatchTag.Break);
1485 while (! domain.Thrown () && args[0].Eval (domain).IsTrue)
1486 for (int i = 1; i < args.Length; i++)
1488 result = args[i].Eval (domain);
1489 if (domain.Thrown ())
1498 private static Term Fcond (Domain domain, Variable vari, Term[] args)
1500 foreach (Term arg in args)
1502 List<Term> list = arg.Listval;
1503 Term result = list[0].Eval (domain);
1507 for (int i = 1; i < list.Count; i++)
1510 result = list[i].Eval (domain);
1512 if (domain.Thrown ())
1521 private static Term Fforeach (Domain domain, Variable vari, Term[] args)
1523 Term result = args[0].Eval (domain);
1524 if (domain.Thrown ())
1526 List<Term> list = result.Listval;
1527 Bindings current = domain.bindings;
1530 domain.Catch (CatchTag.Break);
1531 foreach (Term term in list)
1533 domain.Bind (vari, term);
1535 for (int i = 1; i < args.Length; i++)
1537 result = args[i].Eval (domain);
1538 if (domain.Thrown ())
1542 domain.UnboundTo (current);
1551 private static Term Fquote (Domain domain, Variable vari, Term[] args)
1556 private static Term Ftype (Domain domain, Variable vari, Term[] args)
1562 if (args[0].IsSymbol)
1569 private static Term eval_terms (Domain domain, Term[] terms, int idx,
1575 for (int i = idx; i < terms.Length; i++)
1577 result = terms[i].Eval (domain);
1578 if (domain.Thrown (out caught))
1584 public static Term Fcatch (Domain domain, Variable vari, Term[] args)
1587 bool caught = false;
1589 if (args.Length < 2)
1590 throw new Error (Error.WrongArgument,
1591 "Too few arguments: {0}", args.Length);
1592 ErrorTerm err = args[0].objval as ErrorTerm;
1596 result = eval_terms (domain, args, 1, out caught);
1598 if (! args[0].Matches (e.ErrorTerm))
1601 vari.SetValue (e.ErrorTerm);
1603 } catch (System.Exception e) {
1604 Term term = new Term (new ErrorTerm (e));
1605 if (! args[0].Matches (term))
1608 vari.SetValue (term);
1612 else if (args[0].IsSymbol)
1614 domain.Catch (new CatchTag (args[0].Symval));
1615 result = eval_terms (domain, args, 1, out caught);
1619 throw new Error (Error.WrongArgument,
1620 "Not a symbol nor an error: {0}", args[0]);
1623 vari.SetValue (result);
1627 public static Term Fthrow (Domain domain, Variable vari, Term[] args)
1629 if (args[0].IsSymbol)
1631 domain.ThrowSymbol (args[0]);
1632 return (args[args.Length - 1]);
1634 if (args[0].IsError)
1635 return domain.ThrowError (args[0]);
1636 throw new Error (Error.WrongArgument,
1637 "Not a symbol nor an error: {0}", args[0]);
1640 public abstract class TermValue
1642 public virtual Term Eval (Domain domain) { return this; }
1643 public virtual TermValue Clone () { return this; }
1644 public virtual bool IsTrue { get { return true; } }
1645 public virtual bool Matches (TermValue other) { return Equals (other); }
1646 public override abstract bool Equals (object obj);
1647 public override abstract int GetHashCode ();
1648 public abstract string ToString (bool detail);
1651 private class Varref : TermValue
1653 private static Symbol name = "varref";
1654 public static Symbol Name { get { return name; } }
1656 private Symbol vname;
1657 private Variable vari;
1659 public Varref (Symbol vname) { this.vname = vname; }
1661 public override Term Eval (Domain domain)
1663 if (vari == null || vari.domain != domain)
1664 vari = domain.GetVar (vname, true);
1668 public static TermValue Parser (Domain domain, XmlNode node)
1670 return new Varref ((Symbol) node.Attributes[Qvname].Value);
1673 public override bool Equals (object obj)
1675 Varref varref = obj as Varref;
1676 return (varref != null && varref.vari.name == vari.name);
1679 public override int GetHashCode ()
1681 return vari.name.GetHashCode ();
1684 public override string ToString () { return ToString (true); }
1686 public override string ToString (bool detail)
1688 return "<varref vname=\"" + vname + "\"/>";
1692 private class Funcall : TermValue
1694 private static Symbol name = "funcall";
1695 public static Symbol Name { get { return name; } }
1697 internal Function func;
1698 internal Variable vari;
1699 internal Term[] args;
1701 public Funcall (Function func, Variable vari, Term[] args)
1703 int nargs = args.Length;
1705 if (nargs < func.min_args
1706 || (func.max_args >= 0 && nargs > func.max_args))
1707 throw new Error (Error.WrongArgument,
1708 "Wrong number of arguments to {0}: {1}",
1710 if (! func.with_var && vari != null)
1711 throw new Error (Error.WrongArgument,
1712 "Wrong vname attribute to {0}: {1}",
1713 func.name, vari.name);
1719 public static TermValue Parser (Domain domain, XmlNode node)
1721 Symbol fname = node.Name;
1724 if (fname == Qfuncall)
1725 fname = node.Attributes[Qfname].Value;
1726 Function func = domain.GetFunc (fname);
1728 attr = node.Attributes[Qvname];
1729 vari = attr == null ? null : domain.GetVar (attr.Value, true);
1730 XmlNodeList nlist = node.ChildNodes;
1731 int nargs = nlist.Count;
1732 Term[] args = new Term[nargs];
1733 for (int i = 0; i < nargs; i++)
1734 args[i] = new Term (domain, nlist[i]);
1735 return new Funcall (func, vari, args);
1738 public override Term Eval (Domain domain)
1740 domain.TraceWrite (ToString ());
1742 Term result = func.Call (domain, vari, args);
1744 domain.TraceWrite ("=> {0}", result.ToString ());
1748 public override TermValue Clone ()
1750 return new Funcall (func, vari, args);
1753 public override bool Equals (object obj)
1755 Funcall funcall = obj as Funcall;
1757 && funcall.func == func
1758 && funcall.vari == vari
1759 && funcall.args.Length == args.Length);
1762 public override int GetHashCode ()
1764 return func.GetHashCode () ^ args.Length;
1767 public override string ToString () { return ToString (true); }
1769 public override string ToString (bool detail)
1771 string str = "<" + func.name;
1773 str += " vname=\"" + vari.name + "\"";
1774 if (args.Length == 0 || ! detail)
1777 if (func is Function.SpecialForm)
1779 for (int i = 0; i < args.Length; i++)
1783 foreach (Term e in args)
1785 return (str + "</" + func.name + ">");
1789 internal class ErrorTerm : TermValue
1791 private static Symbol name = "error";
1792 public static Symbol Name { get { return name; } }
1794 private readonly Symbol ename;
1795 private string message;
1796 private Term[] stack;
1798 public ErrorTerm (Symbol ename, string message)
1801 this.message = message;
1804 internal ErrorTerm (Exception e)
1806 if (e is ArithmeticException)
1807 ename = Error.ArithmeticException;
1808 else if (e is IndexOutOfRangeException)
1809 ename = Error.IndexOutOfRange;
1810 else if (e is InsufficientMemoryException
1811 || e is OutOfMemoryException)
1812 ename = Error.MemoryError;
1814 ename = Error.UnknownError;
1815 message = e.Message;
1818 public static TermValue Parser (Domain domain, XmlNode node)
1820 XmlAttribute attr = node.Attributes[Qename];
1821 Symbol ename = attr == null ? Qnull : (Symbol) attr.Value;
1822 string message = node.InnerText;
1823 return new ErrorTerm (ename, message);
1826 public Term[] CallStack { get { return stack; } set { stack = value; } }
1828 public override TermValue Clone ()
1830 return new ErrorTerm (ename, message);
1833 public override bool Equals (object obj)
1835 ErrorTerm e = obj as ErrorTerm;
1836 if (e == null || e.ename != ename || e.message != message
1837 || (e.stack == null ? stack != null
1838 : (stack == null || e.stack.Length != stack.Length)))
1841 for (int i = 0; i < stack.Length; i++)
1842 if (! stack[i].Equals (e.stack[i]))
1847 public override int GetHashCode ()
1849 return ename.GetHashCode ();
1852 public override bool Matches (TermValue term)
1854 ErrorTerm e = term as ErrorTerm;
1855 return (e != null && (ename == Qnull || e.ename == ename));
1858 public override string ToString () { return ToString (true); }
1860 public override string ToString (bool detail)
1862 string str = "<error type=\"" + ename + "\">";
1863 if (message != null)
1866 for (int i = 0; i < stack.Length; i++)
1867 str += stack[i].ToString (false);
1868 return str + "</error>";
1875 public object objval;
1877 // <integer>...</integer>
1878 public Term (int i) { intval = i; objval = null; }
1879 // <symbol>...</symbol>
1880 public Term (Symbol name) { intval = 0; objval = name; }
1881 // <string>...</string>
1882 public Term (string str) { intval = 0; objval = str; }
1884 public Term (List<Term> list) { intval = 0; objval = list; }
1885 // <error ename="ERROR-NAME">ERROR-MESSASGE</error>
1886 public Term (Symbol name, string message)
1889 objval = new ErrorTerm (name, message);
1892 public Term (TermValue obj) { intval = 0; objval = obj; }
1894 public Term (Domain domain, XmlNode node)
1896 Symbol name = node.Name;
1898 if (name == Qinteger)
1900 intval = parse_integer (node);
1906 if (name == Qsymbol)
1907 objval = (Symbol) node.InnerText;
1908 else if (name == Qstring)
1909 objval = node.InnerText.Clone ();
1910 else if (name == Qlist)
1912 List<Term> list = new List<Term> ();
1913 for (node = node.FirstChild; node != null;
1914 node = node.NextSibling)
1915 list.Add (new Term (domain, node));
1922 if (domain.termtypes.TryGetValue (name, out minfo))
1923 objval = (TermValue) minfo.Invoke (null, new Object[] { domain, node});
1926 Funcall funcall = (Funcall) Funcall.Parser (domain, node);
1927 if (funcall.func is Function.Macro)
1929 Term result = funcall.Eval (domain);
1930 intval = result.intval;
1931 objval = result.objval;
1940 // <varref vname="VNAME"/>
1941 public Term (Domain domain, Symbol vname)
1944 objval = new Varref (vname);
1947 // <funcall fname="FNAME">...</funcall>
1948 public Term (Domain domain, Symbol fname, Term[] args)
1949 : this (domain, fname, Qnull, args) { }
1951 // <funcall fname="FNAME" vname="VNAME">...</funcall>
1952 public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
1956 Function func = domain.GetFunc (fname);
1957 Variable vari = vname == Qnull ? null : domain.GetVar (vname, true);
1958 Funcall funcall = new Funcall (func, vari, args);
1959 if (func is Function.Macro)
1961 Term result = funcall.Eval (domain);
1962 intval = result.intval;
1963 objval = result.objval;
1969 public object Objval {
1972 throw new Exception (Qwrong_type,
1973 "term is an integer: {0}", this);
1981 throw new Exception (Qwrong_type, "{0} is not an integer", this);
1986 public string Strval {
1989 throw new Exception (Qwrong_type, "{0} is not a string", this);
1990 return (string) objval;
1994 public string Symval {
1997 throw new Exception (Qwrong_type, "{0} is not a symbol", this);
1998 return (Symbol) objval;
2002 public List<Term> Listval {
2005 throw new Exception (Qwrong_type, "{0} is not a list");
2006 return (List<Term>) objval;
2010 public bool IsTrue {
2012 return (objval == null
2014 : objval is List<Term>
2015 ? (((List<Term>) objval).Count != 0)
2016 : objval is TermValue
2017 ? ((TermValue) objval).IsTrue
2022 public bool IsInt { get { return (objval == null); } }
2023 public bool IsStr { get { return (objval is string); } }
2024 public bool IsSymbol { get { return (objval is Symbol); } }
2025 public bool IsList { get { return (objval is List<Term>); } }
2026 public bool IsError { get { return (objval is ErrorTerm); } }
2028 internal Term Eval (Domain domain)
2030 if (objval == null || objval is Symbol || objval is string
2031 || objval is List<Term>)
2033 domain.CallStackPush (this);
2036 result = ((TermValue) objval).Eval (domain);
2038 domain.CallStackPop ();
2043 public Term Clone ()
2045 if (objval == null || objval is Symbol || objval is string)
2047 if (objval is List<Term>)
2049 List<Term> list = new List<Term> ();
2050 list.InsertRange (0, ((List<Term>) objval));
2051 return new Term (list);
2053 return new Term (((TermValue) objval).Clone ());
2056 public static bool operator== (Term t1, Term t2)
2058 return t1.Equals (t2);
2061 public static bool operator!= (Term t1, Term t2) { return ! (t1 == t2); }
2063 public override bool Equals (object obj)
2065 if (! (obj is Term))
2067 Term term = (Term) obj;
2069 return term.IsInt && term.Intval == Intval;
2071 return term.IsStr && term.Strval == Strval;
2073 return term.IsSymbol && term.Symval == Symval;
2078 List<Term> l1 = objval as List<Term>;
2079 List<Term> l2 = term.objval as List<Term>;
2081 if (l1.Count != l2.Count)
2083 for (int i = 0; i < l1.Count; i++)
2084 if (! l1[i].Equals (l2[i]))
2088 return ((TermValue) objval).Equals (obj);
2091 public override int GetHashCode () { return intval; }
2093 public bool Matches (Term term)
2096 return term.IsInt && term.Intval == Intval;
2098 return term.IsStr && term.Strval == Strval;
2100 return term.IsSymbol && term.Symval == Symval;
2105 List<Term> l1 = objval as List<Term>;
2106 List<Term> l2 = term.objval as List<Term>;
2108 if (l1.Count > l2.Count)
2110 for (int i = 0; i < l1.Count; i++)
2111 if (! l1[i].Equals (l2[i]))
2115 return ((TermValue) objval).Matches ((TermValue) term.objval);
2118 public override string ToString () { return ToString (true); }
2120 public string ToString (bool detail)
2125 str = "<integer>" + intval + "</integer>";
2126 else if (objval is Symbol)
2127 str = "<symbol>" + objval + "</symbol>";
2128 else if (objval is string)
2129 str = "<string>" + objval + "</string>";
2130 else if (objval is List<Term>)
2135 foreach (Term e in (List<Term>) objval)
2142 else if (objval is Term)
2143 str = "<quote>" + objval + "</quote>";
2145 str = ((TermValue) objval).ToString (detail);
2150 private static Term Zero = new Term (0);
2151 private static Term One = new Term (1);
2152 private static Term TermInt = new Term (Qinteger);
2153 private static Term TermStr = new Term (Qstring);
2154 private static Term TermSymbol = new Term (Qsymbol);
2155 private static Term TermList = new Term (Qlist);
2156 private static Term TermTerm = new Term ((Symbol) "term");
2158 private static int parse_integer (XmlNode node)
2160 string str = node.InnerText;
2161 int len = str.Length;
2164 if (len == 1 && str[0] == '?')
2167 && str[1] == 'x' && ((c = str[0]) == '0' || c == '#'))
2169 if (! int.TryParse (str.Substring (2),
2170 Globalization.NumberStyles.HexNumber, null,
2172 throw new Error (Error.InvalidInteger, node,
2173 "Not a integer string: {0}", str);
2176 if (! int.TryParse (str, out i))
2177 throw new Error (Error.InvalidInteger, node,
2178 "Not a integer string: {0}", str);
2182 private static Symbol parse_defvar (Domain domain, XmlNode node)
2184 XmlAttribute name = node.Attributes[Qvname];
2186 throw new Error (Error.NoVariableName, node,
2187 "No variable name to define");
2188 Symbol vname = name.Value;
2192 node = node.FirstChild;
2193 if (node != null && node.Name == Qdescription)
2195 desc = node.InnerText;
2196 node = node.NextSibling;
2202 Symbol type = node.Name;
2203 XmlNodeList range_list = null;
2205 XmlNode n = node.NextSibling;
2209 range_list = n.ChildNodes;
2210 nranges = range_list.Count;
2213 if (type == Qinteger)
2215 int val = parse_integer (node);
2217 if (range_list != null)
2219 range = new int[nranges * 2];
2220 for (int i = 0; i < nranges; i++)
2222 XmlNode nd = range_list[i];
2223 if (nd.Name == Qrange)
2225 range[i * 2] = parse_integer (nd.FirstChild);
2226 range[i * 2 + 1] = parse_integer (nd.LastChild);
2230 range[i * 2] = range[i * 2 + 1]
2231 = parse_integer (nd.FirstChild);
2235 vari = domain.DefvarInt (vname, val, desc, range);
2237 else if (type == Qstring)
2239 string[] range = null;
2240 if (range_list != null)
2242 range = new string[nranges];
2243 for (int i = 0; i < nranges; i++)
2244 range[i] = range_list[i].FirstChild.InnerText;
2246 vari = domain.DefvarStr (vname, node.InnerText, desc, range);
2248 else if (type == Qsymbol)
2250 Symbol[] range = null;
2251 if (range_list != null)
2253 range = new Symbol[nranges];
2254 for (int i = 0; i < nranges; i++)
2255 range[i] = range_list[i].FirstChild.InnerText;
2257 vari = domain.DefvarSym (vname, (Symbol) node.InnerText, desc,
2261 throw new Error (Error.TermTypeInvalid, "Unknown type: {0}", type);
2265 if (domain.variables.TryGetValue (vname, out vari))
2266 vari = vari.Clone (domain);
2268 vari = new Variable (domain, vname, Zero);
2269 domain.variables[vname] = vari;
2274 private static Variable[] parse_args (Domain domain, XmlNode node,
2275 out int min_args, out int max_args)
2282 node = node.FirstChild;
2283 if (node != null && node.Name == Qargs)
2286 for (n = node.FirstChild; n != null; n = n.NextSibling)
2288 if (n.Name == Qfixed)
2289 nfixed += n.ChildNodes.Count;
2290 else if (n.Name == Qoptional)
2291 noptional += n.ChildNodes.Count;
2292 else if (n.Name == Qrest)
2295 throw new Error (Error.WrongType, n,
2296 "Not fixed, optional, nor rest: {0}", n.Name);
2299 max_args = nfixed + noptional + nrest;
2300 args = new Variable[max_args];
2301 n = node.FirstChild;
2302 for (int i = 0; i < max_args; n = n.NextSibling)
2304 for (XmlNode nn = n.FirstChild; nn != null; nn = nn.NextSibling)
2305 args[i++] = domain.Defvar ((Symbol) nn.Attributes[0].Value);
2308 max_args = - max_args;
2312 min_args = max_args = 0;
2313 args = new Variable[0];
2318 public static Symbol parse_defun_head (Domain domain, XmlNode node)
2320 Symbol name = node.Attributes[Qfname].Value;
2321 int min_args, max_args;
2325 args = parse_args (domain, node, out min_args, out max_args);
2326 if (node.Name == Qdefun)
2327 domain.Defun (name, min_args, max_args, args, null);
2329 domain.Defmacro (name, min_args, max_args, args, null);
2331 if (e.ErrorNode == null)
2334 } catch (Exception e) {
2335 throw new Exception (node, e);
2340 public static void parse_defun_body (Domain domain, XmlNode node)
2342 Symbol name = node.Attributes[Qfname].Value;
2343 Function func = domain.GetFunc (name);
2345 for (node = node.FirstChild; node != null; node = node.NextSibling)
2346 if (node.Name != Qdescription
2347 && node.Name != Qargs)
2349 Term[] body = Parse (domain, node, null);
2350 if (node.Name == Qdefun)
2351 ((Function.Lambda) func).SetBody (body);
2353 ((Function.Macro) func).SetBody (body);
2356 public static Term Parse (Domain domain, XmlNode node)
2358 Symbol name = node.Name;
2360 if (name == Qinteger)
2361 return new Term (parse_integer (node));
2362 if (name == Qsymbol)
2363 return new Term ((Symbol) node.InnerText);
2364 if (name == Qstring)
2365 return new Term (node.InnerText);
2368 List<Term> list = new List<Term> ();
2369 for (node = node.FirstChild; node != null;
2370 node = node.NextSibling)
2371 list.Add (Parse (domain, node));
2372 return new Term (list);
2374 if (name == Qdefun || name == Qdefmacro)
2376 name = parse_defun_head (domain, node);
2377 parse_defun_body (domain, node);
2378 return new Term (name);
2380 if (name == Qdefvar)
2382 name = parse_defvar (domain, node);
2383 return new Term (name);
2386 if (domain.termtypes.TryGetValue (name, out minfo))
2388 object[] arg = new object[] { domain, node };
2389 return new Term ((TermValue) minfo.Invoke (null, arg));
2392 Funcall funcall = (Funcall) Funcall.Parser (domain, node);
2393 if (funcall.func is Function.Macro)
2394 return funcall.Eval (domain);
2395 return new Term (funcall);
2398 private static bool default_stop (XmlNode n) { return n == null; }
2400 public static List<Term> Parse (Domain domain, XmlNode node,
2401 Func<XmlNode, bool> stop)
2404 stop = default_stop;
2407 for (n = node; ! stop (n); n = n.NextSibling)
2408 if (n.NodeType == XmlNodeType.Element
2409 && (n.Name == Qdefun || n.Name == Qdefmacro))
2410 parse_defun_head (domain, n);
2412 List<Term> terms = new List<Term> ();
2413 for (; node != n; node = node.NextSibling)
2414 if (node.NodeType == XmlNodeType.Element)
2416 if (node.Name == Qdefun || node.Name == Qdefmacro)
2417 parse_defun_body (domain, node);
2418 else if (node.Name == Qdefvar)
2419 parse_defvar (domain, node);
2421 terms.Add (Parse (domain, node));
2426 public static List<Term> Parse (Domain domain, string url)
2428 XmlDocument doc = new XmlDocument (Symbol.NameTable);
2431 using (XmlTextReader reader = new XmlTextReader (url, doc.NameTable))
2435 } while (reader.NodeType != XmlNodeType.None
2436 && (reader.NodeType != XmlNodeType.Element
2437 || reader.Name != Qexpr));
2438 if (reader.NodeType == XmlNodeType.None)
2439 throw new Exception ("Node <expr> not found");
2440 node = doc.ReadNode (reader);
2442 return Parse (domain, node.FirstChild, null);
2445 public static Term Eval (Domain domain, List<Term> terms)
2449 foreach (Term term in terms)
2451 result = term.Eval (domain);