2 using System.Collections;
3 using System.Collections.Generic;
5 using System.Reflection;
7 using System.Text.RegularExpressions;
12 public static class Xexpression
14 private static int trace_depth = 0;
16 public static int TraceDepth {
17 get { return trace_depth; }
18 set { trace_depth = value; }
21 public class Error : Exception
23 private readonly Symbol name;
27 public Error (Symbol name, XmlNode node,
28 string fmt, params object[] args)
29 : base (String.Format (fmt, args))
35 public Error (Symbol name, XmlNode node, Exception e,
36 string fmt, params object[] args)
37 : base (String.Format (fmt, args), e)
43 public Error (Symbol name, string fmt, params object[] args)
44 : base (String.Format (fmt, args))
49 public Symbol Name { get { return name; } }
52 internal set { node = value; }
56 internal set { stack = value; }
59 public override string ToString ()
61 string str = (InnerException != null ? InnerException.ToString ()
62 : base.ToString ()) + "\n" + "Xexpression:" + name + "\n";
64 str += " at " + node.OuterXml + "\n";
67 str += "Call stack: ";
68 foreach (Term term in stack)
69 str += term.ToString (false);
75 // System.OutOfMemoryException or System.InsufficientMemoryException
76 public static Symbol MemoryError = "memory-error";
78 public static Symbol UnknownError = "unknown-error";
79 public static Symbol WrongArgument = "wrong-argument";
82 public static Symbol InvalidInteger = "invalid-integer";
83 public static Symbol TermTypeInvalid = "term-type-invalid";
84 public static Symbol FunctionConflict = "function-conflict";
85 public static Symbol VariableTypeConflict = "variable-type-conflict";
86 public static Symbol VariableRangeConflict = "variable-range-conflict";
87 public static Symbol VariableWrongRange = "variable-wrong-range";
88 public static Symbol VariableWrongValue = "variable-wrong-value";
90 public static Symbol UnknownFunction = "unknown-function";
91 public static Symbol MacroExpansionError = "macro-expansion-error";
92 public static Symbol NoVariableName = "no-variable-anme";
95 public static Symbol ArithmeticError = "arithmetic-error";
96 public static Symbol WrongType = "wrong-type";
97 public static Symbol IndexOutOfRange = "index-out-of-range";
98 public static Symbol ValueOutOfRange = "value-out-of-range";
99 public static Symbol NoLoopToBreak = "no-loop-to-break";
100 public static Symbol UncaughtThrow = "uncaught-throw";
103 public struct Symbol : IEquatable<Symbol>
105 private static NameTable nt = new NameTable ();
109 public Symbol (string str) { name = nt.Add (str); }
111 public static implicit operator Symbol (string str)
113 return new Symbol (str);
116 public static implicit operator string (Symbol sym) { return sym.name; }
118 public static bool operator== (Symbol n1, Symbol n2)
120 return (object) n1.name == (object) n2.name;
123 public static bool operator!= (Symbol n1, Symbol n2)
125 return (object) n1.name != (object) n2.name;
128 public static bool operator== (Symbol n1, string n2)
130 return (object) n1.name == (object) n2;
133 public static bool operator!= (Symbol n1, string n2)
135 return (object) n1.name != (object) n2;
138 public static bool operator== (string n1, Symbol n2)
140 return (object) n1 == (object) n2.name;
143 public static bool operator!= (string n1, Symbol n2)
145 return (object) n1 != (object) n2.name;
148 public bool Equals (Symbol name)
150 return Object.ReferenceEquals (this.name, name.name);
153 public override bool Equals (object obj)
155 return (obj is Symbol ? this == (Symbol) obj
156 : obj is string ? this.name == (string) obj
160 public override int GetHashCode ()
162 return name.GetHashCode ();
165 public static NameTable NameTable { get { return nt; } }
167 public override string ToString () { return name; }
170 private static Symbol Qexpr = "expr";
172 private static Symbol Qnull = "";
173 private static Symbol Qfuncall = "funcall";
174 private static Symbol Qinteger = "integer";
175 private static Symbol Qstring = "string";
176 private static Symbol Qsymbol = "symbol";
177 private static Symbol Qlist = "list";
179 public static Symbol Qdefun = "defun";
180 public static Symbol Qdefmacro = "defmacro";
181 private static Symbol Qfname = "fname";
182 private static Symbol Qargs = "args";
183 private static Symbol Qfixed = "fixed";
184 private static Symbol Qoptional = "optional";
185 private static Symbol Qrest = "rest";
187 public static Symbol Qdefvar = "defvar";
188 private static Symbol Qvname = "vname";
189 private static Symbol Qdescription = "description";
190 private static Symbol Qrange = "range";
192 private static Symbol Qename = "ename";
194 public class Variable
196 public Domain domain;
197 public readonly Symbol name;
200 public Variable (Domain domain, Symbol name, Term val)
202 this.domain = domain;
207 public Term Value { get { return val; } }
209 public virtual Term SetValue (Term val) { this.val = val; return val; }
211 public virtual Variable Clone (Domain domain)
213 return new Variable (domain, name, val);
216 public virtual void Reset () { val = Zero; }
218 public override string ToString () { return name + "(" + val + ")"; }
220 public abstract class Typed : Variable
222 protected string desc;
223 private Term default_val;
225 protected Typed (Domain domain, Symbol name, Term val, string desc)
226 : base (domain, name, val)
232 public override void Reset () { val = default_val; }
234 public string Description {
236 set { desc = value; }
239 public override Term SetValue (Term val)
241 if (! CheckValue (val))
242 throw new Error (Error.VariableWrongValue,
243 "Wrong value for variable {0}: {1}",
249 public abstract bool CheckValue (Term val);
252 public class IntType : Typed
256 public bool IsSubrange (int[] r)
260 for (int i = 0; i < r.Length; i += 2)
263 for (j = 0; j < range.Length; j += 2)
264 if (range[j] <= r[i] && range[j + 1] >= r[i + 1])
266 if (j >= range.Length)
272 public IntType (Domain domain, Symbol name, int n, string desc,
274 : base (domain, name, new Term (n), desc)
276 if (range != null && range.Length % 2 == 1)
277 throw new Error (Error.VariableWrongRange,
278 "Range length for {0} not even", name);
283 public override bool CheckValue (Term term)
290 for (int i = 0; i < range.Length; i += 2)
291 if (range[i] <= n && range[i + 1] >= n)
297 public override Variable Clone (Domain domain)
299 return new IntType (domain, name, val.Intval, desc, range);
302 public int[] Range { get { return range; } set { range = value; } }
305 public class StrType : Typed
307 private string[] range;
309 public bool IsSubrange (string[] r)
313 for (int i = 0; i < r.Length; i++)
316 for (j = 0; j < range.Length; j++)
317 if (range[j] == r[i])
319 if (j >= range.Length)
325 public StrType (Domain domain, Symbol name, Str str, string desc,
327 : base (domain, name, new Term (str), desc)
333 public override bool CheckValue (Term val)
339 Str str = val.Strval;
340 foreach (string s in range)
347 public override Variable Clone (Domain domain)
349 return new StrType (domain, name, val.Strval, desc, range);
352 public string[] Range { get { return range; } set { range = value; } }
355 public class SymType : Typed
357 public Symbol[] range;
359 public bool IsSubrange (Symbol[] r)
363 for (int i = 0; i < r.Length; i++)
366 for (j = 0; j < range.Length; j++)
367 if (range[j] == r[i])
369 if (j >= range.Length)
375 public SymType (Domain domain, Symbol name, Symbol sym, string desc,
377 : base (domain, name, new Term (sym), desc)
383 public override bool CheckValue (Term val)
389 Symbol sym = val.Symval;
390 foreach (Symbol n in range)
397 public override Variable Clone (Domain domain)
399 return new SymType (domain, name, val.Symval, desc, range);
402 public Symbol[] Range { get { return range; } set { range = value; } }
406 public abstract class Function
409 // True iff the function can be called with vname="VNAME" attribute.
410 internal readonly bool with_var;
411 // Minimum number of positional arguments.
412 internal readonly int min_args;
413 // If non-nengative, maximum number of arguments. If negative,
414 // maxinum number of positional arguments is (-1 - max_args),
415 // and the remaining unlimit number of arguments are given as a
417 internal readonly int max_args;
419 public delegate Term Builtin (Domain domain, Variable vari, Term[] terms);
421 public Function () { }
423 public Function (Symbol name, bool with_var, int min_args, int max_args)
426 this.with_var = with_var;
427 this.min_args = min_args;
428 this.max_args = max_args;
431 public abstract Term Call (Domain domain, Variable vari, Term[] args);
433 public override string ToString ()
438 internal class Subroutine : Function
440 public Builtin builtin;
442 public Subroutine (Builtin builtin, Symbol name, bool with_var,
443 int min_args, int max_args)
444 : base (name, with_var, min_args, max_args)
446 this.builtin = builtin;
449 public override Term Call (Domain domain, Variable vari, Term[] args)
453 args = (Term[]) args.Clone ();
454 for (int i = 0; i < args.Length; i++)
456 args[i] = args[i].Eval (domain);
457 if (domain.Thrown ())
461 return builtin (domain, vari, args);
465 internal class SpecialForm : Function
467 public Builtin builtin;
469 public SpecialForm (Builtin builtin, Symbol name, bool with_var,
470 int min_args, int max_args)
471 : base (name, with_var, min_args, max_args)
473 this.builtin = builtin;
476 public override Term Call (Domain domain, Variable vari, Term[] args)
478 return builtin (domain, vari, args);
482 internal class Lambda : Function
484 private Variable[] args;
487 public Lambda (Symbol name, int min_args, int max_args, Variable[] args,
489 : base (name, false, min_args, max_args)
495 public void SetBody (Term[] body)
500 public override Term Call (Domain domain, Variable vari, Term[] args)
502 Bindings current = domain.bindings;
504 int limit = max_args >= 0 ? args.Length : args.Length - 1;
507 for (int i = 0; i < limit; i++)
509 result = args[i].Eval (domain);
510 if (domain.Thrown ())
512 domain.Bind (this.args[i], result);
516 List<Term> list = new List<Term> ();
517 list.InsertRange (0, args[limit].Listval);
519 for (int i = 0; i < list.Count; i++)
521 result = list[i].Eval (domain);
522 if (domain.Thrown ())
526 domain.Bind (this.args[limit], new Term (list));
529 domain.Catch (CatchTag.Return);
530 foreach (Term term in body)
532 result = term.Eval (domain);
533 if (domain.Thrown ())
540 domain.UnboundTo (current);
546 internal class Macro : Function
548 private Variable[] args;
551 public Macro (Symbol name, int min_args, int max_args, Variable[] args,
553 : base (name, false, min_args, max_args)
559 public void SetBody (Term[] body)
564 public override Term Call (Domain domain, Variable vari, Term[] args)
566 Bindings current = domain.bindings;
570 for (int i = 0; i < args.Length; i++)
571 domain.Bind (this.args[i], args[i]);
573 domain.Catch (CatchTag.Return);
574 foreach (Term term in body)
576 result = term.Eval (domain);
577 if (domain.Thrown ())
584 domain.UnboundTo (current);
591 internal class Bindings
593 private Variable vari;
594 private Term old_value;
595 private Bindings next;
597 private Bindings (Variable vari)
600 old_value = vari.Value;
603 public static Bindings Bind (Bindings bindings, Variable vari, Term val)
605 Bindings b = new Bindings (vari);
607 b.vari.SetValue (val);
612 internal Bindings UnboundTo (Bindings boundary)
614 for (Bindings b = this; b != boundary; b = b.next)
615 b.vari.SetValue (b.old_value);
619 public override string ToString ()
621 string str = "(bindings";
622 for (Bindings b = this; b != null; b = b.next)
623 str += " " + vari.name + "=" + b.old_value;
628 internal struct CatchTag
631 public Term Tag { get { return tag; } }
633 // Normal symbolic catch-tag.
634 public CatchTag (Symbol sym) { tag = new Term (sym); }
635 // Special catch-tag for return and break.
636 private CatchTag (int i) { tag = new Term (i); }
638 public static CatchTag Return = new CatchTag (0);
639 public static CatchTag Break = new CatchTag (1);
645 public object context;
646 public int depth = 0;
647 private Stack<Term> call_stack = new Stack<Term> ();
649 internal Dictionary<Symbol, MethodInfo> termtypes
650 = new Dictionary<Symbol, MethodInfo> ();
651 internal Dictionary<Symbol, Function> functions
652 = new Dictionary<Symbol, Function> ();
653 internal Dictionary<Symbol, Variable> variables
654 = new Dictionary<Symbol, Variable> ();
655 internal Bindings bindings;
656 private Stack<CatchTag> catch_stack = new Stack<CatchTag> ();
657 private int catch_count = 0;
659 internal Domain (Symbol name) { this.name = name; }
661 public Domain (Symbol name, object context)
662 : this (name, basic, context) { }
664 public Domain (Symbol name, Domain parent, object context) : this (name)
666 termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
667 functions = new Dictionary<Symbol, Function> (parent.functions);
668 variables = new Dictionary<Symbol, Variable> (parent.variables);
669 this.context = context;
672 public int CallStackCount { get { return call_stack.Count; } }
674 public void CallStackPush (Term term) { call_stack.Push (term); }
676 public void CallStackPop () { call_stack.Pop (); }
678 public void CallStackPop (int count)
680 while (count < call_stack.Count)
684 public Term[] CallStack { get { return call_stack.ToArray (); } }
686 internal void Bind (Variable vari, Term value)
688 bindings = Bindings.Bind (bindings, vari, value);
691 internal void UnboundTo (Bindings boundary)
693 if (bindings != null)
694 bindings = bindings.UnboundTo (boundary);
697 internal void Catch (CatchTag tag)
699 catch_stack.Push (tag);
703 internal void Uncatch ()
706 if (catch_count > catch_stack.Count)
710 public bool Thrown () { return catch_count < catch_stack.Count; }
712 public bool Thrown (out bool caught)
714 if (catch_count < catch_stack.Count)
716 caught = catch_count == catch_stack.Count - 1;
723 internal void ThrowReturn ()
725 foreach (CatchTag elt in catch_stack)
728 if (elt.Tag == CatchTag.Return.Tag)
733 internal void ThrowBreak ()
735 if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
736 throw new Error (Error.NoLoopToBreak,
737 "No surrounding loop to break");
741 internal void ThrowSymbol (Term tag)
744 foreach (CatchTag elt in catch_stack)
747 if (elt.Tag.Matches (tag))
753 throw new Error (Error.UncaughtThrow,
754 "No corresponding catch: {0}", tag);
757 public void DefType (Type type)
759 if (! type.IsSubclassOf (typeof (TermValue)))
760 throw new Error (Error.TermTypeInvalid,
761 "Not a subclass of TermValue: {0}", type);
762 BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
763 FieldInfo finfo = type.GetField ("name", flags);
764 if (finfo == null || finfo.FieldType != typeof (Symbol))
765 throw new Error (Error.TermTypeInvalid,
766 "No \"name\" field of string type: {0}", type);
767 Symbol name = (Symbol) finfo.GetValue (null);
768 if (termtypes.ContainsKey (name))
769 throw new Error (Error.TermTypeInvalid,
770 "Already defined: {0}", name);
771 if (functions.ContainsKey (name))
772 throw new Error (Error.TermTypeInvalid,
773 "Already defined as a function or a macro: {0}",
775 Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
776 MethodInfo parser = type.GetMethod ("Parser", types);
777 if (parser == null || parser.ReturnType != typeof (TermValue))
778 throw new Error (Error.TermTypeInvalid,
779 "No \"Parser\" method of correct type: {0}", type);
780 termtypes[name] = parser;
783 private void check_func_head (Symbol name, bool with_var,
784 int min_args, int max_args, bool as_macro)
786 if (termtypes.ContainsKey (name))
787 throw new Error (Error.FunctionConflict,
788 "Already defined as a term type: {0}", name);
790 if (functions.TryGetValue (name, out func))
792 if ((func is Function.Macro) != as_macro)
793 throw new Error (Error.FunctionConflict,
794 "Already defined as a {0}: {1}",
795 as_macro ? "function" : "macro", name);
796 if (func.with_var != with_var
797 || func.min_args != min_args
798 || func.max_args != max_args)
799 throw new Error (Error.FunctionConflict,
800 "Conflicting arguments: {0}", name);
804 public void DefSubr (Function.Builtin builtin, Symbol name,
805 bool with_var, int min_args, int max_args)
807 check_func_head (name, with_var, min_args, max_args, false);
808 functions[name] = new Function.Subroutine (builtin, name, with_var,
812 public void DefSpecial (Function.Builtin builtin, Symbol name,
813 bool with_var, int min_args, int max_args)
815 check_func_head (name, with_var, min_args, max_args, false);
816 functions[name] = new Function.SpecialForm (builtin, name, with_var,
820 public void Defun (Symbol name, int min_args, int max_args,
821 Variable[] args, Term[] body)
823 check_func_head (name, false, min_args, max_args, false);
824 functions[name] = new Function.Lambda (name, min_args, max_args,
828 public void Defun (Function func)
830 functions[func.name] = func;
833 public void Defmacro (Symbol name, int min_args, int max_args,
834 Variable[] args, Term[] body)
836 check_func_head (name, false, min_args, max_args, true);
837 functions[name] = new Function.Macro (name, min_args, max_args,
841 public void DefAlias (Symbol alias, Symbol fname)
844 if (termtypes.ContainsKey (alias))
845 throw new Error (Error.FunctionConflict,
846 "Alread defined as a term type: {0}", alias);
847 if (functions.ContainsKey (alias))
848 throw new Error (Error.FunctionConflict,
849 "Alread defined as a function: {0}", alias);
850 if (! functions.TryGetValue (fname, out func))
851 throw new Error (Error.UnknownFunction, fname);
852 functions[alias] = func;
855 public Variable Defvar (Variable vari)
857 vari = vari.Clone (this);
858 variables[vari.name] = vari;
862 internal Variable Defvar (Symbol name)
866 if (variables.TryGetValue (name, out vari))
868 Variable.Typed typed = vari as Variable.Typed;
870 throw new Error (Error.VariableTypeConflict,
871 "Not a non-typed variable: {0}", name);
875 vari = new Variable (this, name, Zero);
876 variables[name] = vari;
881 public Variable DefvarInt (Symbol name, int n, string desc, int[] range)
885 if (variables.TryGetValue (name, out vari))
887 Variable.IntType intvari = vari as Variable.IntType;
889 throw new Error (Error.VariableTypeConflict,
890 "Not an integer variable: {0}", name);
893 if (! intvari.IsSubrange (range))
894 throw new Error (Error.VariableRangeConflict,
895 "Conflicting variable range: {0}", name);
896 intvari.Range = range;;
899 intvari.Description = desc;
903 vari = new Variable.IntType (this, name, n, desc, range);
904 variables[name] = vari;
909 public Variable DefvarStr (Symbol name, string str, string desc,
914 if (variables.TryGetValue (name, out vari))
916 Variable.StrType strvari = vari as Variable.StrType;
918 throw new Error (Error.VariableTypeConflict,
919 "Not a string variable: {0}", name);
922 if (! strvari.IsSubrange (range))
923 throw new Error (Error.VariableRangeConflict,
924 "Conflicting variable range: {0}", name);
925 strvari.Range = range;
928 strvari.Description = desc;
932 vari = new Variable.StrType (this, name, new Str (str), desc,
934 variables[name] = vari;
939 public Variable DefvarSym (Symbol name, Symbol sym, string desc,
944 if (variables.TryGetValue (name, out vari))
946 Variable.SymType symvari = vari as Variable.SymType;
948 throw new Error (Error.VariableTypeConflict,
949 "Not a symbol variable: {0}", name);
952 if (! symvari.IsSubrange (range))
953 throw new Error (Error.VariableRangeConflict,
954 "Conflicting variable range: {0}", name);
955 symvari.Range = range;
958 symvari.Description = desc;
962 vari = new Variable.SymType (this, name, sym, desc, range);
963 variables[name] = vari;
968 internal Function GetFunc (Symbol name)
971 if (! functions.TryGetValue (name, out func))
972 throw new Error (Error.UnknownFunction,
973 "Unknown function: {0}", name);
977 public bool CopyFunc (Domain domain, Symbol name)
979 Function func = GetFunc (name);
981 domain.functions[name] = func;
985 public void CopyFunc (Domain domain)
987 foreach (KeyValuePair<Symbol, Function> kv in functions)
988 domain.functions[kv.Key] = kv.Value;
991 public Variable GetVarCreate (Symbol name)
995 if (! variables.TryGetValue (name, out vari))
996 variables[name] = vari = new Variable (this, name, Zero);
1000 public Variable GetVar (Symbol name)
1004 if (! variables.TryGetValue (name, out vari))
1009 public override string ToString ()
1011 string str = "<(functions";
1012 foreach (KeyValuePair<Symbol, Function> kv in functions)
1013 str += " " + kv.Key;
1014 str += ") (variabls";
1015 foreach (KeyValuePair<Symbol, Variable> kv in variables)
1016 str += " " + kv.Value;
1018 if (bindings != null)
1019 str += " " + bindings;
1020 if (context != null)
1021 str += " (" + context + ")";
1026 internal void TraceWrite (string fmt, params string[] arg)
1028 if (trace_depth > depth)
1030 for (int i = 0; i < depth; i++)
1031 Console.Write (" ");
1032 Console.WriteLine (fmt, arg);
1036 public object SaveValues ()
1038 Dictionary<Variable,Term> values = new Dictionary<Variable,Term> ();
1040 foreach (KeyValuePair<Symbol,Variable> kv in variables)
1041 values[kv.Value] = kv.Value.Value.Clone ();
1045 public void RestoreValues (object values)
1047 foreach (KeyValuePair<Variable,Term> kv
1048 in (Dictionary<Variable,Term>) values)
1049 kv.Key.SetValue (kv.Value);
1053 private static Domain basic = new Domain ("basic");
1055 static Xexpression ()
1057 basic.DefType (typeof (Varref));
1058 basic.DefType (typeof (Funcall));
1059 basic.DefType (typeof (ErrorTerm));
1061 basic.DefSubr (Fset, "set", true, 1, 1);
1062 basic.DefAlias ("=", "set");
1063 basic.DefSubr (Fnot, "not", false, 1, 1);
1064 basic.DefAlias ("!", "not");
1065 basic.DefSubr (Fadd, "add", true, 1, -1);
1066 basic.DefAlias ("+", "add");
1067 basic.DefSubr (Fmul, "mul", true, 1, -1);
1068 basic.DefAlias ("*", "mul");
1069 basic.DefSubr (Fsub, "sub", true, 1, -1);
1070 basic.DefAlias ("-", "sub");
1071 basic.DefSubr (Fdiv, "div", true, 1, -1);
1072 basic.DefAlias ("/", "div");
1073 basic.DefSubr (Fmod, "mod", true, 1, 2);
1074 basic.DefAlias ("%", "mod");
1075 basic.DefSubr (Flogior, "logior", true, 1, -1);
1076 basic.DefAlias ("|", "logior");
1077 basic.DefSubr (Flogand, "logand", true, 1, -1);
1078 basic.DefAlias ("&", "logand");
1079 basic.DefSubr (Flsh, "lsh", true, 1, 2);
1080 basic.DefAlias ("<<", "lsh");
1081 basic.DefSubr (Frsh, "rsh", true, 1, 2);
1082 basic.DefAlias (">>", "rsh");
1083 basic.DefSubr (Feq, "eq", false, 2, -1);
1084 basic.DefAlias ("==", "eq");
1085 basic.DefSubr (Fnoteq, "noteq", false, 2, 2);
1086 basic.DefAlias ("!=", "noteq");
1087 basic.DefSubr (Flt, "lt", false, 2, -1);
1088 basic.DefAlias ("<", "lt");
1089 basic.DefSubr (Fle, "le", false, 2, -1);
1090 basic.DefAlias ("<=", "le");
1091 basic.DefSubr (Fgt, "gt", false, 2, -1);
1092 basic.DefAlias (">", "gt");
1093 basic.DefSubr (Fge, "ge", false, 2, -1);
1094 basic.DefAlias (">=", "ge");
1096 basic.DefSubr (Fappend, "append", true, 0, -1);
1097 basic.DefSubr (Fconcat, "concat", true, 0, -1);
1098 basic.DefSubr (Fnth, "nth", false, 2, 2);
1099 basic.DefSubr (Fcopy, "copy", false, 1, 1);
1100 basic.DefSubr (Fins, "ins", true, 2, 2);
1101 basic.DefSubr (Fdel, "del", true, 2, 2);
1102 basic.DefSubr (Feval, "eval", false, 1, 1);
1103 basic.DefSubr (Fbreak, "break", false, 0, 1);
1104 basic.DefSubr (Freturn, "return", false, 0, 1);
1105 basic.DefSubr (Fthrow, "throw", false, 1, 2);
1107 basic.DefSpecial (Fand, "and", false, 1, -1);
1108 basic.DefAlias ("&&", "and");
1109 basic.DefSpecial (For, "or", false, 1, -1);
1110 basic.DefAlias ("||", "or");
1111 basic.DefSpecial (Fprogn, "progn", false, 0, -1);
1112 basic.DefAlias ("expr", "progn");
1113 basic.DefSpecial (Fif, "if", false, 2, 3);
1114 basic.DefSpecial (Fwhen, "when", false, 1, -1);
1115 basic.DefSpecial (Floop, "loop", false, 1, -1);
1116 basic.DefSpecial (Fwhile, "while", false, 1, -1);
1117 basic.DefSpecial (Fcond, "cond", false, 1, -1);
1118 basic.DefSpecial (Fforeach, "foreach", true, 2, -1);
1119 basic.DefSpecial (Fquote, "quote", false, 1, 1);
1120 basic.DefSpecial (Ftype, "type", false, 1, 1);
1121 basic.DefSpecial (Fcatch, "catch", true, 2, -1);
1124 private static Term Fset (Domain domain, Variable vari, Term[] args)
1127 throw new Error (Error.NoVariableName, "No variable name to set");
1128 vari.SetValue (args[0]);
1132 private static Term Fnot (Domain domain, Variable vari, Term[] args)
1134 return args[0].IsTrue ? Zero : One;
1137 static Term maybe_set_intvar (Variable vari, int n)
1139 Term term = new Term (n);
1141 vari.SetValue (term);
1146 private static Term Fadd (Domain domain, Variable vari, Term[] args)
1148 int n = vari == null ? 0 : vari.Value.Intval;
1150 foreach (Term arg in args)
1152 return maybe_set_intvar (vari, n);
1155 private static Term Fmul (Domain domain, Variable vari, Term[] args)
1157 int n = vari == null ? 1 : vari.Value.Intval;
1158 foreach (Term arg in args)
1160 return maybe_set_intvar (vari, n);
1163 private static Term Fsub (Domain domain, Variable vari, Term[] args)
1174 n = vari.Value.Intval;
1177 while (i < args.Length)
1178 n -= args[i++].Intval;
1179 return maybe_set_intvar (vari, n);
1182 private static Term Fdiv (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 Fmod (Domain domain, Variable vari, Term[] args)
1203 return maybe_set_intvar (vari, args[0].Intval % args[1].Intval);
1206 private static Term Flogior (Domain domain, Variable vari, Term[] args)
1208 int n = vari == null ? 0 : vari.Value.Intval;
1209 foreach (Term arg in args)
1211 return maybe_set_intvar (vari, n);
1214 private static Term Flogand (Domain domain, Variable vari, Term[] args)
1225 n = vari.Value.Intval;
1228 while (i < args.Length)
1229 n &= args[i++].Intval;
1230 return maybe_set_intvar (vari, n);
1233 private static Term Flsh (Domain domain, Variable vari, Term[] args)
1235 return maybe_set_intvar (vari, args[0].Intval << args[1].Intval);
1238 private static Term Frsh (Domain domain, Variable vari, Term[] args)
1240 return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval);
1243 private static Term Feq (Domain domain, Variable vari, Term[] args)
1247 if (o.objval == null)
1249 for (int i = 1; i < args.Length; i++)
1250 if (args[i].objval != null || args[i].intval != o.intval)
1255 for (int i = 1; i < args.Length; i++)
1256 if (o.objval.Equals (args[i].objval))
1262 private static Term Fnoteq (Domain domain, Variable vari, Term[] args)
1264 return Feq (domain, vari, args);
1267 private static Term Flt (Domain domain, Variable vari, Term[] args)
1269 int n = args[0].Intval;
1271 for (int i = 1; i < args.Length; i++)
1273 int n1 = args[i].Intval;
1281 private static Term Fle (Domain domain, Variable vari, Term[] args)
1283 int n = args[0].Intval;
1284 for (int i = 1; i < args.Length; i++)
1286 int n1 = args[i].Intval;
1294 private static Term Fgt (Domain domain, Variable vari, Term[] args)
1296 int n = args[0].Intval;
1297 for (int i = 1; i < args.Length; i++)
1299 int n1 = args[i].Intval;
1307 private static Term Fge (Domain domain, Variable vari, Term[] args)
1309 int n = args[0].Intval;
1310 for (int i = 1; i < args.Length; i++)
1312 int n1 = args[i].Intval;
1320 private static Term Fappend (Domain domain, Variable vari, Term[] args)
1325 list = new List<Term> ();
1327 list = vari.Value.Listval;
1329 foreach (Term arg in args)
1332 list.AddRange ((List<Term>) arg.objval);
1340 result.objval = list;
1346 private static Term Fconcat (Domain domain, Variable vari, Term[] args)
1348 Str str = vari == null ? new Str ("") : vari.Value.Strval;
1350 foreach (Term arg in args)
1353 str.Insert (-1, arg.Strval);
1354 else if (arg.IsList)
1355 foreach (Term term in arg.Listval)
1356 str.Insert (-1, (char) term.Intval);
1358 str.Insert (-1, (char) arg.Intval);
1360 return vari == null ? new Term (str) : vari.Value;
1363 private static Term Fnth (Domain domain, Variable vari, Term[] args)
1366 return new Term (args[1].Strval.Nth (args[0].Intval));
1368 return args[1].Listval[args[0].Intval];
1369 throw new Error (Error.WrongType,
1370 "Not a string nor a list: {0}", args[1]);
1373 private static Term Fcopy (Domain domain, Variable vari, Term[] args)
1375 return args[0].Clone ();
1378 private static Term Fins (Domain domain, Variable vari, Term[] args)
1381 throw new Error (Error.NoVariableName, "No variable name to set");
1382 if (vari.Value.IsStr)
1383 vari.Value.Strval.Insert (args[0].Intval, args[1].Strval);
1384 else if (vari.Value.IsList)
1385 vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval);
1387 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1392 private static Term Fdel (Domain domain, Variable vari, Term[] args)
1395 throw new Error (Error.NoVariableName, "No variable name to set");
1396 if (vari.Value.IsStr)
1397 vari.Value.Strval.Delete (args[0].Intval, args[1].Intval);
1398 else if (vari.Value.IsList)
1399 vari.Value.Listval.RemoveRange (args[0].Intval,
1400 args[1].Intval - args[0].Intval);
1402 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1407 private static Term Fand (Domain domain, Variable vari, Term[] args)
1409 foreach (Term arg in args)
1411 Term result = arg.Eval (domain);
1412 if (domain.Thrown ())
1414 if (! result.IsTrue)
1420 private static Term For (Domain domain, Variable vari, Term[] args)
1422 foreach (Term arg in args)
1424 Term result = arg.Eval (domain);
1425 if (domain.Thrown ())
1433 private static Term Feval (Domain domain, Variable vari, Term[] args)
1435 return (args[0].Eval (domain));
1438 private static Term Fprogn (Domain domain, Variable vari, Term[] args)
1442 foreach (Term arg in args)
1444 result = arg.Eval (domain);
1445 if (domain.Thrown ())
1451 private static Term Fif (Domain domain, Variable vari, Term[] args)
1453 Term result = args[0].Eval (domain);
1458 return args[1].Eval (domain);
1459 if (args.Length == 2)
1461 return args[2].Eval (domain);
1464 private static Term Fwhen (Domain domain, Variable vari, Term[] args)
1466 Term result = args[0].Eval (domain);
1470 if (! result.IsTrue)
1473 for (int i = 1; i < args.Length; i++)
1475 result = args[i].Eval (domain);
1482 private static Term Freturn (Domain domain, Variable vari, Term[] args)
1484 domain.ThrowReturn ();
1485 return args.Length == 0 ? Zero : args[0];
1488 private static Term Fbreak (Domain domain, Variable vari, Term[] args)
1490 domain.ThrowBreak ();
1491 return args.Length == 0 ? Zero : args[0];
1494 private static Term Floop (Domain domain, Variable vari, Term[] args)
1498 domain.Catch (CatchTag.Break);
1499 while (! domain.Thrown ())
1500 foreach (Term arg in args)
1502 result = arg.Eval (domain);
1503 if (domain.Thrown ())
1512 private static Term Fwhile (Domain domain, Variable vari, Term[] args)
1516 domain.Catch (CatchTag.Break);
1517 while (! domain.Thrown () && args[0].Eval (domain).IsTrue)
1518 for (int i = 1; i < args.Length; i++)
1520 result = args[i].Eval (domain);
1521 if (domain.Thrown ())
1530 private static Term Fcond (Domain domain, Variable vari, Term[] args)
1532 foreach (Term arg in args)
1534 List<Term> list = arg.Listval;
1535 Term result = list[0].Eval (domain);
1539 for (int i = 1; i < list.Count; i++)
1542 result = list[i].Eval (domain);
1544 if (domain.Thrown ())
1553 private static Term Fforeach (Domain domain, Variable vari, Term[] args)
1555 Term result = args[0].Eval (domain);
1556 if (domain.Thrown ())
1558 List<Term> list = result.Listval;
1559 Bindings current = domain.bindings;
1562 domain.Catch (CatchTag.Break);
1563 foreach (Term term in list)
1565 domain.Bind (vari, term);
1567 for (int i = 1; i < args.Length; i++)
1569 result = args[i].Eval (domain);
1570 if (domain.Thrown ())
1574 domain.UnboundTo (current);
1583 private static Term Fquote (Domain domain, Variable vari, Term[] args)
1588 private static Term Ftype (Domain domain, Variable vari, Term[] args)
1594 if (args[0].IsSymbol)
1601 private static Term eval_terms (Domain domain, Term[] terms, int idx,
1607 for (int i = idx; i < terms.Length; i++)
1609 result = terms[i].Eval (domain);
1610 if (domain.Thrown (out caught))
1616 public static Term Fcatch (Domain domain, Variable vari, Term[] args)
1619 bool caught = false;
1621 if (args.Length < 2)
1622 throw new Error (Error.WrongArgument,
1623 "Too few arguments: {0}", args.Length);
1624 ErrorTerm err = args[0].objval as ErrorTerm;
1628 result = eval_terms (domain, args, 1, out caught);
1629 } catch (System.Exception exception) {
1632 Error e = exception as Error;
1634 term = new Term (new ErrorTerm (e.Name, e.Message, e.Stack));
1636 term = new Term (new ErrorTerm (exception));
1637 if (! args[0].Matches (term))
1640 vari.SetValue (term);
1644 else if (args[0].IsSymbol)
1647 domain.Catch (new CatchTag (args[0].Symval));
1648 result = eval_terms (domain, args, 1, out caught);
1652 vari.SetValue (result);
1660 throw new Error (Error.WrongArgument,
1661 "Not a symbol nor an error: {0}", args[0]);
1664 public static Term Fthrow (Domain domain, Variable vari, Term[] args)
1666 if (args[0].IsSymbol)
1668 domain.ThrowSymbol (args[0]);
1669 return (args[args.Length - 1]);
1671 if (args[0].IsError)
1673 ErrorTerm err = (ErrorTerm) args[0].objval;
1674 throw new Error (err.ErrorName, err.ErrorMessage);
1676 throw new Error (Error.WrongArgument,
1677 "Not a symbol nor an error: {0}", args[0]);
1680 public abstract class TermValue
1682 public virtual Term Eval (Domain domain) { return new Term (this); }
1683 public virtual TermValue Clone () { return this; }
1684 public virtual bool IsTrue { get { return true; } }
1685 public virtual bool Matches (TermValue other) { return Equals (other); }
1686 public override abstract bool Equals (object obj);
1687 public override abstract int GetHashCode ();
1688 public virtual string ToString (bool detail) { return ToString (); }
1691 private class Varref : TermValue
1693 private static Symbol name = "varref";
1694 public static Symbol Name { get { return name; } }
1696 private Symbol vname;
1697 private Variable vari;
1699 public Varref (Symbol vname) { this.vname = vname; }
1701 public override Term Eval (Domain domain)
1703 if (vari == null || vari.domain != domain)
1704 vari = domain.GetVarCreate (vname);
1708 public static TermValue Parser (Domain domain, XmlNode node)
1710 return new Varref ((Symbol) node.Attributes[Qvname].Value);
1713 public override bool Equals (object obj)
1715 Varref varref = obj as Varref;
1716 return (varref != null && varref.vari.name == vari.name);
1719 public override int GetHashCode ()
1721 return vari.name.GetHashCode ();
1724 public override string ToString () { return ToString (true); }
1726 public override string ToString (bool detail)
1728 return "<varref vname=\"" + vname + "\"/>";
1732 private class Funcall : TermValue
1734 private static Symbol name = "funcall";
1735 public static Symbol Name { get { return name; } }
1736 private static Term[] null_args = new Term[0];
1738 internal Function func;
1739 internal Variable vari;
1740 internal Term[] args;
1742 public Funcall (Function func, Variable vari, Term[] args)
1746 int nargs = args.Length;
1747 if (nargs < func.min_args
1748 || (func.max_args >= 0 && nargs > func.max_args))
1749 throw new Error (Error.WrongArgument,
1750 "Wrong number of arguments to {0}: {1}",
1752 if (! func.with_var && vari != null)
1753 throw new Error (Error.WrongArgument,
1754 "Wrong vname attribute to {0}: {1}",
1755 func.name, vari.name);
1761 public static TermValue Parser (Domain domain, XmlNode node)
1763 Symbol fname = node.Name;
1766 if (fname == Qfuncall)
1767 fname = node.Attributes[Qfname].Value;
1768 Function func = domain.GetFunc (fname);
1770 attr = node.Attributes[Qvname];
1771 vari = attr == null ? null : domain.GetVarCreate (attr.Value);
1772 XmlNodeList nlist = node.ChildNodes;
1773 int nargs = nlist.Count;
1774 Term[] args = new Term[nargs];
1775 for (int i = 0; i < nargs; i++)
1776 args[i] = Parse (domain, nlist[i]);
1777 return new Funcall (func, vari, args);
1780 public override Term Eval (Domain domain)
1783 domain.TraceWrite (ToString ());
1786 result = func.Call (domain, vari, args);
1790 domain.TraceWrite ("=> {0}", result.ToString ());
1794 public override TermValue Clone ()
1796 return new Funcall (func, vari, args);
1799 public override bool Equals (object obj)
1801 Funcall funcall = obj as Funcall;
1803 && funcall.func == func
1804 && funcall.vari == vari
1805 && funcall.args.Length == args.Length);
1808 public override int GetHashCode ()
1810 return func.GetHashCode () ^ args.Length;
1813 public override string ToString () { return ToString (true); }
1815 public override string ToString (bool detail)
1817 string str = "<" + func.name;
1820 str += " vname=\"" + vari.name + "\"";
1822 str += " val=" + vari.Value.ToString ();
1824 if (args.Length == 0 || ! detail)
1827 if (func is Function.SpecialForm)
1829 for (int i = 0; i < args.Length; i++)
1833 foreach (Term e in args)
1835 return (str + "</" + func.name + ">");
1839 internal class ErrorTerm : TermValue
1841 private static Symbol name = "error";
1842 public static Symbol Name { get { return name; } }
1844 private readonly Symbol ename;
1845 public Symbol ErrorName { get { return ename; } }
1846 private string message;
1847 public string ErrorMessage { get { return message; } }
1848 private Term[] stack;
1850 public ErrorTerm (Symbol ename, string message)
1851 : this (ename, message, null) { }
1853 internal ErrorTerm (Symbol ename, string message, Term[] stack)
1856 this.message = message;
1860 internal ErrorTerm (Exception e)
1862 if (e is ArithmeticException)
1863 ename = Error.ArithmeticError;
1864 else if (e is IndexOutOfRangeException)
1865 ename = Error.IndexOutOfRange;
1866 else if (e is InsufficientMemoryException
1867 || e is OutOfMemoryException)
1868 ename = Error.MemoryError;
1870 ename = Error.UnknownError;
1871 message = e.Message;
1874 public static TermValue Parser (Domain domain, XmlNode node)
1876 XmlAttribute attr = node.Attributes[Qename];
1877 Symbol ename = attr == null ? Qnull : (Symbol) attr.Value;
1878 string message = node.InnerText;
1879 return new ErrorTerm (ename, message);
1882 public Term[] CallStack {
1883 get { return stack; }
1884 internal set { stack = value; }
1887 public override TermValue Clone ()
1889 return new ErrorTerm (ename, message);
1892 public override bool Equals (object obj)
1894 ErrorTerm e = obj as ErrorTerm;
1895 return (e != null && e.ename == ename && e.message == message
1896 && (e.stack == null ? stack == null
1897 : (stack != null && e.stack.Length == stack.Length)));
1900 public override int GetHashCode ()
1902 return ename.GetHashCode ();
1905 public override bool Matches (TermValue term)
1907 ErrorTerm e = term as ErrorTerm;
1908 return (e != null && (ename == Qnull || e.ename == ename));
1911 public override string ToString () { return ToString (true); }
1913 public override string ToString (bool detail)
1915 string str = "<error type=\"" + ename + "\">";
1916 if (message != null)
1919 for (int i = 0; i < stack.Length; i++)
1920 str += stack[i].ToString (false);
1921 return str + "</error>";
1928 private Regex regex;
1930 public Str (string str) { this.str = str; }
1932 public Str Clone (Str str) { return new Str (str.str); }
1934 public bool Equals (string str) { return this.str == str; }
1936 public bool Equals (Str str) { return this.str == str.str; }
1938 public bool Matches (Str str)
1941 regex = new Regex (this.str);
1942 return regex.IsMatch (str.str);
1945 public int Nth (int index) { return (int) str[index]; }
1947 public void Insert (int index, Str str)
1950 this.str = this.str + str.str;
1952 this.str = this.str.Insert (index, str.str);
1956 public void Insert (int index, char c)
1959 this.str = this.str + c;
1961 this.str = this.str.Insert (index, new string (c, 1));
1965 public void Delete (int from, int to)
1967 this.str = this.str.Remove (from, to - from);
1971 public override string ToString () { return str; }
1977 public object objval;
1979 // <integer>...</integer>
1980 public Term (int i) { intval = i; objval = null; }
1981 // <symbol>...</symbol>
1982 public Term (Symbol name) { intval = 0; objval = name; }
1983 // <string>...</string>
1984 public Term (string str) { intval = 0; objval = new Str (str); }
1986 public Term (List<Term> list) { intval = 0; objval = list; }
1987 // <error ename="ERROR-NAME">ERROR-MESSASGE</error>
1988 public Term (Symbol name, string message)
1991 objval = new ErrorTerm (name, message);
1994 public Term (Str str) { intval = 0; objval = str; }
1995 public Term (TermValue obj) { intval = 0; objval = obj; }
1997 // <varref vname="VNAME"/>
1998 public Term (Domain domain, Symbol vname)
2001 objval = new Varref (vname);
2004 // <funcall fname="FNAME">...</funcall>
2005 public Term (Domain domain, Symbol fname, Term[] args)
2006 : this (domain, fname, Qnull, args) { }
2008 // <funcall fname="FNAME" vname="VNAME">...</funcall>
2009 public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
2013 Function func = domain.GetFunc (fname);
2014 Variable vari = vname == Qnull ? null : domain.GetVarCreate(vname);
2015 Funcall funcall = new Funcall (func, vari, args);
2016 if (func is Function.Macro)
2018 Term result = funcall.Eval (domain);
2019 intval = result.intval;
2020 objval = result.objval;
2026 public object Objval {
2029 throw new Error (Error.WrongType,
2030 "term is an integer: {0}", this);
2038 throw new Error (Error.WrongType, "{0} is not an integer", this);
2046 throw new Error (Error.WrongType, "{0} is not a string", this);
2047 return (Str) objval;
2051 public string Symval {
2054 throw new Error (Error.WrongType, "{0} is not a symbol", this);
2055 return (Symbol) objval;
2059 public List<Term> Listval {
2062 throw new Error (Error.WrongType, "{0} is not a list");
2063 return (List<Term>) objval;
2067 public bool IsTrue {
2069 return (objval == null
2071 : objval is List<Term>
2072 ? (((List<Term>) objval).Count != 0)
2073 : objval is TermValue
2074 ? ((TermValue) objval).IsTrue
2079 public bool IsInt { get { return (objval == null); } }
2080 public bool IsStr { get { return (objval is Str); } }
2081 public bool IsSymbol { get { return (objval is Symbol); } }
2082 public bool IsList { get { return (objval is List<Term>); } }
2083 public bool IsError { get { return (objval is ErrorTerm); } }
2085 internal Term Eval (Domain domain)
2087 if (objval == null || objval is Symbol || objval is Str
2088 || objval is List<Term>)
2091 domain.CallStackPush (this);
2092 return ((TermValue) objval).Eval (domain);
2094 if (e.Stack == null)
2095 e.Stack = domain.CallStack;
2098 domain.CallStackPop ();
2102 public Term Clone ()
2104 if (objval == null || objval is Symbol)
2107 return new Term (((Str) objval).ToString ());
2108 if (objval is List<Term>)
2110 List<Term> list = new List<Term> ();
2111 list.InsertRange (0, ((List<Term>) objval));
2112 return new Term (list);
2114 return new Term (((TermValue) objval).Clone ());
2117 public static bool operator== (Term t1, Term t2)
2119 return t1.Equals (t2);
2122 public static bool operator!= (Term t1, Term t2) { return ! (t1 == t2); }
2124 public override bool Equals (object obj)
2126 if (! (obj is Term))
2128 Term term = (Term) obj;
2130 return term.IsInt && term.Intval == Intval;
2132 return term.IsSymbol && term.Symval == Symval;
2134 return (term.IsStr && term.Strval.Equals (Strval));
2139 List<Term> l1 = objval as List<Term>;
2140 List<Term> l2 = term.objval as List<Term>;
2142 if (l1.Count != l2.Count)
2144 for (int i = 0; i < l1.Count; i++)
2145 if (! l1[i].Equals (l2[i]))
2149 return ((TermValue) objval).Equals (obj);
2152 public override int GetHashCode () { return intval; }
2154 public bool Matches (Term term)
2157 return term.IsInt && Intval == term.Intval;
2159 return term.IsSymbol && Symval == term.Symval;
2161 return term.IsStr && Strval.Matches (term.Strval);
2166 List<Term> l1 = objval as List<Term>;
2167 List<Term> l2 = term.objval as List<Term>;
2169 if (l1.Count > l2.Count)
2171 for (int i = 0; i < l1.Count; i++)
2172 if (! l1[i].Equals (l2[i]))
2176 return ((TermValue) objval).Matches ((TermValue) term.objval);
2179 public override string ToString () { return ToString (true); }
2181 public string ToString (bool detail)
2186 str = "<integer>" + intval + "</integer>";
2187 else if (objval is Symbol)
2188 str = "<symbol>" + objval + "</symbol>";
2189 else if (objval is Str)
2190 str = "<string>" + objval + "</string>";
2191 else if (objval is List<Term>)
2196 foreach (Term e in (List<Term>) objval)
2203 else if (objval is Term)
2204 str = "<quote>" + objval + "</quote>";
2206 str = ((TermValue) objval).ToString (detail);
2211 private static Term Zero = new Term (0);
2212 private static Term One = new Term (1);
2213 private static Term TermInt = new Term (Qinteger);
2214 private static Term TermStr = new Term (Qstring);
2215 private static Term TermSymbol = new Term (Qsymbol);
2216 private static Term TermList = new Term (Qlist);
2217 private static Term TermTerm = new Term ((Symbol) "term");
2219 private static int parse_integer (XmlNode node)
2221 string str = node.InnerText;
2222 int len = str.Length;
2225 if (len == 2 && str[0] == '?')
2228 && str[1] == 'x' && ((c = str[0]) == '0' || c == '#'))
2230 if (! int.TryParse (str.Substring (2),
2231 Globalization.NumberStyles.HexNumber, null,
2233 throw new Error (Error.InvalidInteger, node,
2234 "Not a integer string: {0}", str);
2237 if (! int.TryParse (str, out i))
2238 throw new Error (Error.InvalidInteger, node,
2239 "Not a integer string: {0}", str);
2243 private static Symbol parse_defvar (Domain domain, XmlNode node)
2245 XmlAttribute name = node.Attributes[Qvname];
2247 throw new Error (Error.NoVariableName, node,
2248 "No variable name to define");
2249 Symbol vname = name.Value;
2253 node = node.FirstChild;
2254 if (node != null && node.Name == Qdescription)
2256 desc = node.InnerText;
2257 node = node.NextSibling;
2263 Symbol type = node.Name;
2264 XmlNodeList range_list = null;
2266 XmlNode n = node.NextSibling;
2270 range_list = n.ChildNodes;
2271 nranges = range_list.Count;
2274 if (type == Qinteger)
2276 int val = parse_integer (node);
2278 if (range_list != null)
2280 range = new int[nranges * 2];
2281 for (int i = 0; i < nranges; i++)
2283 XmlNode nd = range_list[i];
2284 if (nd.Name == Qrange)
2286 range[i * 2] = parse_integer (nd.FirstChild);
2287 range[i * 2 + 1] = parse_integer (nd.LastChild);
2291 range[i * 2] = range[i * 2 + 1]
2292 = parse_integer (nd.FirstChild);
2296 vari = domain.DefvarInt (vname, val, desc, range);
2298 else if (type == Qstring)
2300 string[] range = null;
2301 if (range_list != null)
2303 range = new string[nranges];
2304 for (int i = 0; i < nranges; i++)
2305 range[i] = range_list[i].FirstChild.InnerText;
2307 vari = domain.DefvarStr (vname, node.InnerText, desc, range);
2309 else if (type == Qsymbol)
2311 Symbol[] range = null;
2312 if (range_list != null)
2314 range = new Symbol[nranges];
2315 for (int i = 0; i < nranges; i++)
2316 range[i] = range_list[i].FirstChild.InnerText;
2318 vari = domain.DefvarSym (vname, (Symbol) node.InnerText, desc,
2322 throw new Error (Error.TermTypeInvalid, "Unknown type: {0}", type);
2326 if (domain.variables.TryGetValue (vname, out vari))
2327 vari = vari.Clone (domain);
2329 vari = new Variable (domain, vname, Zero);
2330 domain.variables[vname] = vari;
2335 private static Variable[] parse_args (Domain domain, XmlNode node,
2336 out int min_args, out int max_args)
2343 node = node.FirstChild;
2344 if (node != null && node.Name == Qargs)
2347 for (n = node.FirstChild; n != null; n = n.NextSibling)
2349 if (n.Name == Qfixed)
2351 else if (n.Name == Qoptional)
2353 else if (n.Name == Qrest)
2356 throw new Error (Error.WrongType, n, "Too many <rest>");
2360 throw new Error (Error.WrongType, n,
2361 "Not fixed, optional, nor rest: {0}", n.Name);
2364 max_args = nfixed + noptional + nrest;
2365 args = new Variable[max_args];
2366 n = node.FirstChild;
2367 for (int i = 0; i < max_args; n = n.NextSibling)
2368 args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value);
2370 max_args = - max_args;
2374 min_args = max_args = 0;
2375 args = new Variable[0];
2380 public static Symbol parse_defun_head (Domain domain, XmlNode node)
2382 Symbol name = node.Attributes[Qfname].Value;
2383 int min_args, max_args;
2386 args = parse_args (domain, node, out min_args, out max_args);
2387 if (node.Name == Qdefun)
2388 domain.Defun (name, min_args, max_args, args, null);
2390 domain.Defmacro (name, min_args, max_args, args, null);
2394 public static void parse_defun_body (Domain domain, XmlNode node)
2396 bool is_defun = node.Name == Qdefun;
2397 Symbol name = node.Attributes[Qfname].Value;
2398 Function func = domain.GetFunc (name);
2400 for (node = node.FirstChild; node != null; node = node.NextSibling)
2401 if (node.Name != Qdescription && node.Name != Qargs)
2403 Console.WriteLine ("found body " + node.Name);
2405 Term[] body = Parse (domain, node, null);
2407 ((Function.Lambda) func).SetBody (body);
2409 ((Function.Macro) func).SetBody (body);
2412 public static Term Parse (Domain domain, XmlNode node)
2414 Symbol name = node.Name;
2417 if (name == Qinteger)
2418 return new Term (parse_integer (node));
2419 if (name == Qsymbol)
2420 return new Term ((Symbol) node.InnerText);
2421 if (name == Qstring)
2422 return new Term (node.InnerText);
2425 List<Term> list = new List<Term> ();
2426 for (node = node.FirstChild; node != null;
2427 node = node.NextSibling)
2428 list.Add (Parse (domain, node));
2429 return new Term (list);
2431 if (name == Qdefun || name == Qdefmacro)
2433 name = parse_defun_head (domain, node);
2434 parse_defun_body (domain, node);
2435 return new Term (name);
2437 if (name == Qdefvar)
2439 name = parse_defvar (domain, node);
2440 return new Term (name);
2443 if (domain.termtypes.TryGetValue (name, out parser))
2445 object[] arg = new object[] { domain, node };
2446 return new Term ((TermValue) parser.Invoke (null, arg));
2449 Funcall funcall = (Funcall) Funcall.Parser (domain, node);
2450 if (funcall.func is Function.Macro)
2451 return funcall.Eval (domain);
2452 return new Term (funcall);
2457 } catch (Exception e) {
2458 throw new Error (Error.UnknownError, node, e, "Parsing error");
2462 private static bool default_stop (XmlNode n) { return n == null; }
2464 public delegate bool ParseStop (XmlNode node);
2466 public static Term[] Parse (Domain domain, XmlNode node, ParseStop stop)
2469 stop = default_stop;
2472 for (n = node; ! stop (n); n = n.NextSibling)
2473 if (n.NodeType == XmlNodeType.Element
2474 && (n.Name == Qdefun || n.Name == Qdefmacro))
2477 parse_defun_head (domain, n);
2482 } catch (Exception e) {
2483 throw new Error (Error.UnknownError, node, e, "Parsing error");
2487 List<Term> terms = new List<Term> ();
2488 for (; node != n; node = node.NextSibling)
2489 if (node.NodeType == XmlNodeType.Element)
2492 if (node.Name == Qdefun || node.Name == Qdefmacro)
2493 parse_defun_body (domain, node);
2494 else if (node.Name == Qdefvar)
2495 parse_defvar (domain, node);
2497 terms.Add (Parse (domain, node));
2502 } catch (Exception e) {
2503 throw new Error (Error.UnknownError, node, e, "Parsing error");
2506 return terms.ToArray ();
2509 public static Term[] Parse (Domain domain, string url)
2511 XmlDocument doc = new XmlDocument (Symbol.NameTable);
2514 using (XmlTextReader reader = new XmlTextReader (url, Symbol.NameTable))
2516 reader.WhitespaceHandling = WhitespaceHandling.None;
2519 } while (reader.NodeType != XmlNodeType.None
2520 && (reader.NodeType != XmlNodeType.Element
2521 || reader.Name != Qexpr));
2522 if (reader.NodeType == XmlNodeType.None)
2523 throw new Exception ("Node <expr> not found");
2524 node = doc.ReadNode (reader);
2526 return Parse (domain, node.FirstChild, null);
2529 public static Term Eval (Domain domain, Term term)
2531 return Eval (domain, new Term[] { term });
2534 public static Term Eval (Domain domain, Term[] terms)
2539 foreach (Term term in terms)
2541 result = term.Eval (domain);
2542 if (domain.Thrown ())
2548 } catch (Exception e) {
2549 throw new Error (Error.UnknownError, null, e, "Runtime error");