2 using System.Collections;
3 using System.Collections.Generic;
5 using System.Reflection;
11 public static class Xexpression
13 private static int trace_depth = 0;
15 public static int TraceDepth {
16 get { return trace_depth; }
17 set { trace_depth = value; }
20 public class Error : Exception
22 private readonly Symbol name;
26 public Error (Symbol name, XmlNode node,
27 string fmt, params object[] args)
28 : base (String.Format (fmt, args))
34 public Error (Symbol name, XmlNode node, Exception e,
35 string fmt, params object[] args)
36 : base (String.Format (fmt, args), e)
42 public Error (Symbol name, string fmt, params object[] args)
43 : base (String.Format (fmt, args))
48 public Symbol Name { get { return name; } }
51 internal set { node = value; }
55 internal set { stack = value; }
58 public override string ToString ()
60 string str = (InnerException != null ? InnerException.ToString ()
61 : base.ToString ()) + "\n" + "Xexpression:" + name + "\n";
63 str += " at " + node.OuterXml + "\n";
66 str += "Call stack: ";
67 foreach (Term term in stack)
68 str += term.ToString (false);
74 // System.OutOfMemoryException or System.InsufficientMemoryException
75 public static Symbol MemoryError = "memory-error";
77 public static Symbol UnknownError = "unknown-error";
78 public static Symbol WrongArgument = "wrong-argument";
81 public static Symbol InvalidInteger = "invalid-integer";
82 public static Symbol TermTypeInvalid = "term-type-invalid";
83 public static Symbol FunctionConflict = "function-conflict";
84 public static Symbol VariableTypeConflict = "variable-type-conflict";
85 public static Symbol VariableRangeConflict = "variable-range-conflict";
86 public static Symbol VariableWrongRange = "variable-wrong-range";
87 public static Symbol VariableWrongValue = "variable-wrong-value";
88 public static Symbol UnknownFunction = "unknown-function";
89 public static Symbol MacroExpansionError = "macro-expansion-error";
90 public static Symbol NoVariableName = "no-variable-anme";
93 public static Symbol ArithmeticError = "arithmetic-error";
94 public static Symbol WrongType = "wrong-type";
95 public static Symbol IndexOutOfRange = "index-out-of-range";
96 public static Symbol ValueOutOfRange = "value-out-of-range";
97 public static Symbol NoLoopToBreak = "no-loop-to-break";
98 public static Symbol UncaughtThrow = "uncaught-throw";
101 public struct Symbol : IEquatable<Symbol>
103 private static NameTable nt = new NameTable ();
107 public Symbol (string str) { name = nt.Add (str); }
109 public static implicit operator Symbol (string str)
111 return new Symbol (str);
114 public static implicit operator string (Symbol sym) { return sym.name; }
116 public static bool operator== (Symbol n1, Symbol n2)
118 return (object) n1.name == (object) n2.name;
121 public static bool operator!= (Symbol n1, Symbol n2)
123 return (object) n1.name != (object) n2.name;
126 public static bool operator== (Symbol n1, string n2)
128 return (object) n1.name == (object) n2;
131 public static bool operator!= (Symbol n1, string n2)
133 return (object) n1.name != (object) n2;
136 public static bool operator== (string n1, Symbol n2)
138 return (object) n1 == (object) n2.name;
141 public static bool operator!= (string n1, Symbol n2)
143 return (object) n1 != (object) n2.name;
146 public bool Equals (Symbol name)
148 return Object.ReferenceEquals (this.name, name.name);
151 public override bool Equals (object obj)
153 return (obj is Symbol ? this == (Symbol) obj
154 : obj is string ? this.name == (string) obj
158 public override int GetHashCode ()
160 return name.GetHashCode ();
163 public static NameTable NameTable { get { return nt; } }
165 public override string ToString () { return name; }
168 private static Symbol Qexpr = "expr";
170 private static Symbol Qnull = "";
171 private static Symbol Qfuncall = "funcall";
172 private static Symbol Qinteger = "integer";
173 private static Symbol Qstring = "string";
174 private static Symbol Qsymbol = "symbol";
175 private static Symbol Qlist = "list";
177 public static Symbol Qdefun = "defun";
178 public static Symbol Qdefmacro = "defmacro";
179 private static Symbol Qfname = "fname";
180 private static Symbol Qargs = "args";
181 private static Symbol Qfixed = "fixed";
182 private static Symbol Qoptional = "optional";
183 private static Symbol Qrest = "rest";
185 public static Symbol Qdefvar = "defvar";
186 private static Symbol Qvname = "vname";
187 private static Symbol Qdescription = "description";
188 private static Symbol Qrange = "range";
190 private static Symbol Qename = "ename";
192 public class Variable
194 public Domain domain;
195 public readonly Symbol name;
198 public Variable (Domain domain, Symbol name, Term val)
200 this.domain = domain;
205 public Term Value { get { return val; } }
207 public virtual Term SetValue (Term val) { this.val = val; return val; }
209 public virtual Variable Clone (Domain domain)
211 return new Variable (domain, name, val);
214 public virtual void Reset () { val = Zero; }
216 public override string ToString () { return name + "(" + val + ")"; }
218 public abstract class Typed : Variable
220 protected string desc;
221 private Term default_val;
223 protected Typed (Domain domain, Symbol name, Term val, string desc)
224 : base (domain, name, val)
230 public override void Reset () { val = default_val; }
232 public string Description {
234 set { desc = value; }
237 public override Term SetValue (Term val)
239 if (! CheckValue (val))
240 throw new Error (Error.VariableWrongValue,
241 "Wrong value for variable {0}: {1}",
247 public abstract bool CheckValue (Term val);
250 public class Int : Typed
254 public bool IsSubrange (int[] r)
258 for (int i = 0; i < r.Length; i += 2)
261 for (j = 0; j < range.Length; j += 2)
262 if (range[j] <= r[i] && range[j + 1] >= r[i + 1])
264 if (j >= range.Length)
270 public Int (Domain domain, Symbol name, int n, string desc, int[] range)
271 : base (domain, name, new Term (n), desc)
273 if (range != null && range.Length % 2 == 1)
274 throw new Error (Error.VariableWrongRange,
275 "Range length for {0} not even", name);
280 public override bool CheckValue (Term term)
287 for (int i = 0; i < range.Length; i += 2)
288 if (range[i] <= n && range[i + 1] >= n)
294 public override Variable Clone (Domain domain)
296 return new Int (domain, name, val.Intval, desc, range);
299 public int[] Range { get { return range; } set { range = value; } }
302 public class Str : Typed
304 private string[] range;
306 public bool IsSubrange (string[] r)
310 for (int i = 0; i < r.Length; i++)
313 for (j = 0; j < range.Length; j++)
314 if (range[j] == r[i])
316 if (j >= range.Length)
322 public Str (Domain domain, Symbol name, string str, string desc,
324 : base (domain, name, new Term (str), desc)
330 public override bool CheckValue (Term val)
336 string str = val.Strval;
337 foreach (string s in range)
344 public override Variable Clone (Domain domain)
346 return new Str (domain, name, val.Strval, desc, range);
349 public string[] Range { get { return range; } set { range = value; } }
352 public class Sym : Typed
354 public Symbol[] range;
356 public bool IsSubrange (Symbol[] r)
360 for (int i = 0; i < r.Length; i++)
363 for (j = 0; j < range.Length; j++)
364 if (range[j] == r[i])
366 if (j >= range.Length)
372 public Sym (Domain domain, Symbol name, Symbol sym, string desc,
374 : base (domain, name, new Term (sym), desc)
380 public override bool CheckValue (Term val)
386 Symbol sym = val.Symval;
387 foreach (Symbol n in range)
394 public override Variable Clone (Domain domain)
396 return new Sym (domain, name, val.Symval, desc, range);
399 public Symbol[] Range { get { return range; } set { range = value; } }
403 public abstract class Function
406 // True iff the function can be called with vname="VNAME" attribute.
407 internal readonly bool with_var;
408 // Minimum number of positional arguments.
409 internal readonly int min_args;
410 // If non-nengative, maximum number of arguments. If negative,
411 // maxinum number of positional arguments is (-1 - max_args),
412 // and the remaining unlimit number of arguments are given as a
414 internal readonly int max_args;
416 public Function () { }
418 public Function (Symbol name, bool with_var, int min_args, int max_args)
421 this.with_var = with_var;
422 this.min_args = min_args;
423 this.max_args = max_args;
426 public abstract Term Call (Domain domain, Variable vari, Term[] args);
428 public override string ToString ()
433 internal class Subroutine : Function
435 public Func<Domain, Variable, Term[], Term> builtin;
437 public Subroutine (Func<Domain, Variable, Term[], Term> builtin,
438 Symbol name, bool with_var,
439 int min_args, int max_args)
440 : base (name, with_var, min_args, max_args)
442 this.builtin = builtin;
445 public override Term Call (Domain domain, Variable vari, Term[] args)
449 args = (Term[]) args.Clone ();
450 for (int i = 0; i < args.Length; i++)
452 args[i] = args[i].Eval (domain);
453 if (domain.Thrown ())
457 return builtin (domain, vari, args);
461 internal class SpecialForm : Function
463 public Func<Domain, Variable, Term[], Term> builtin;
465 public SpecialForm (Func<Domain, Variable, Term[], Term> builtin,
466 Symbol name, bool with_var,
467 int min_args, int max_args)
468 : base (name, with_var, min_args, max_args)
470 this.builtin = builtin;
473 public override Term Call (Domain domain, Variable vari, Term[] args)
475 return builtin (domain, vari, args);
479 internal class Lambda : Function
481 private Variable[] args;
484 public Lambda (Symbol name, int min_args, int max_args, Variable[] args,
486 : base (name, false, min_args, max_args)
492 public void SetBody (Term[] body)
497 public override Term Call (Domain domain, Variable vari, Term[] args)
499 Bindings current = domain.bindings;
501 int limit = max_args >= 0 ? args.Length : args.Length - 1;
504 for (int i = 0; i < limit; i++)
506 result = args[i].Eval (domain);
507 if (domain.Thrown ())
509 domain.Bind (this.args[i], result);
513 List<Term> list = new List<Term> ();
514 list.InsertRange (0, args[limit].Listval);
516 for (int i = 0; i < list.Count; i++)
518 result = list[i].Eval (domain);
519 if (domain.Thrown ())
523 domain.Bind (this.args[limit], new Term (list));
526 domain.Catch (CatchTag.Return);
527 foreach (Term term in body)
529 result = term.Eval (domain);
530 if (domain.Thrown ())
537 domain.UnboundTo (current);
543 internal class Macro : Function
545 private Variable[] args;
548 public Macro (Symbol name, int min_args, int max_args, Variable[] args,
550 : base (name, false, min_args, max_args)
556 public void SetBody (Term[] body)
561 public override Term Call (Domain domain, Variable vari, Term[] args)
563 Bindings current = domain.bindings;
567 for (int i = 0; i < args.Length; i++)
568 domain.Bind (this.args[i], args[i]);
570 domain.Catch (CatchTag.Return);
571 foreach (Term term in body)
573 result = term.Eval (domain);
574 if (domain.Thrown ())
581 domain.UnboundTo (current);
588 internal class Bindings
590 private Variable vari;
591 private Term old_value;
592 private Bindings next;
594 private Bindings (Variable vari)
597 old_value = vari.Value;
600 public static Bindings Bind (Bindings bindings, Variable vari, Term val)
602 Bindings b = new Bindings (vari);
604 b.vari.SetValue (val);
609 internal Bindings UnboundTo (Bindings boundary)
611 for (Bindings b = this; b != boundary; b = b.next)
612 b.vari.SetValue (b.old_value);
616 public override string ToString ()
618 string str = "(bindings";
619 for (Bindings b = this; b != null; b = b.next)
620 str += " " + vari.name + "=" + b.old_value;
625 internal struct CatchTag
628 public Term Tag { get { return tag; } }
630 // Normal symbolic catch-tag.
631 public CatchTag (Symbol sym) { tag = new Term (sym); }
632 // Special catch-tag for return and break.
633 private CatchTag (int i) { tag = new Term (i); }
635 public static CatchTag Return = new CatchTag (0);
636 public static CatchTag Break = new CatchTag (1);
642 public object context;
643 public int depth = 0;
644 private Stack<Term> call_stack = new Stack<Term> ();
646 internal Dictionary<Symbol, MethodInfo> termtypes
647 = new Dictionary<Symbol, MethodInfo> ();
648 internal Dictionary<Symbol, Function> functions
649 = new Dictionary<Symbol, Function> ();
650 internal Dictionary<Symbol, Variable> variables
651 = new Dictionary<Symbol, Variable> ();
652 internal Bindings bindings;
653 private Stack<CatchTag> catch_stack = new Stack<CatchTag> ();
654 private int catch_count = 0;
656 internal Domain (Symbol name) { this.name = name; }
658 public Domain (Symbol name, object context)
659 : this (name, basic, context) { }
661 public Domain (Symbol name, Domain parent, object context) : this (name)
663 termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
664 functions = new Dictionary<Symbol, Function> (parent.functions);
665 variables = new Dictionary<Symbol, Variable> (parent.variables);
666 this.context = context;
669 public int CallStackCount { get { return call_stack.Count; } }
671 public void CallStackPush (Term term) { call_stack.Push (term); }
673 public void CallStackPop () { call_stack.Pop (); }
675 public void CallStackPop (int count)
677 while (count < call_stack.Count)
681 public Term[] CallStack { get { return call_stack.ToArray (); } }
683 internal void Bind (Variable vari, Term value)
685 bindings = Bindings.Bind (bindings, vari, value);
688 internal void UnboundTo (Bindings boundary)
690 if (bindings != null)
691 bindings = bindings.UnboundTo (boundary);
694 internal void Catch (CatchTag tag)
696 catch_stack.Push (tag);
700 internal void Uncatch ()
703 if (catch_count > catch_stack.Count)
707 public bool Thrown () { return catch_count < catch_stack.Count; }
709 public bool Thrown (out bool caught)
711 if (catch_count < catch_stack.Count)
713 caught = catch_count == catch_stack.Count - 1;
720 internal void ThrowReturn ()
722 foreach (CatchTag elt in catch_stack)
725 if (elt.Tag == CatchTag.Return.Tag)
730 internal void ThrowBreak ()
732 if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
733 throw new Error (Error.NoLoopToBreak,
734 "No surrounding loop to break");
738 internal void ThrowSymbol (Term tag)
740 foreach (CatchTag elt in catch_stack)
743 if (elt.Tag.Matches (tag))
746 throw new Error (Error.UncaughtThrow,
747 "No corresponding catch: {0}", tag);
750 public void DefType (Type type)
752 if (! type.IsSubclassOf (typeof (TermValue)))
753 throw new Error (Error.TermTypeInvalid,
754 "Not a subclass of TermValue: {0}", type);
755 BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
756 FieldInfo finfo = type.GetField ("name", flags);
757 if (finfo == null || finfo.FieldType != typeof (Symbol))
758 throw new Error (Error.TermTypeInvalid,
759 "No \"name\" field of string type: {0}", type);
760 Symbol name = (Symbol) finfo.GetValue (null);
761 if (termtypes.ContainsKey (name))
762 throw new Error (Error.TermTypeInvalid,
763 "Already defined: {0}", name);
764 if (functions.ContainsKey (name))
765 throw new Error (Error.TermTypeInvalid,
766 "Already defined as a function or a macro: {0}",
768 Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
769 MethodInfo parser = type.GetMethod ("Parser", types);
770 if (parser == null || parser.ReturnType != typeof (TermValue))
771 throw new Error (Error.TermTypeInvalid,
772 "No \"Parser\" method of correct type: {0}", type);
773 termtypes[name] = parser;
776 private void check_func_head (Symbol name, bool with_var,
777 int min_args, int max_args, bool as_macro)
779 if (termtypes.ContainsKey (name))
780 throw new Error (Error.FunctionConflict,
781 "Already defined as a term type: {0}", name);
783 if (functions.TryGetValue (name, out func))
785 if ((func is Function.Macro) != as_macro)
786 throw new Error (Error.FunctionConflict,
787 "Already defined as a {0}: {1}",
788 as_macro ? "function" : "macro", name);
789 if (func.with_var != with_var
790 || func.min_args != min_args
791 || func.max_args != max_args)
792 throw new Error (Error.FunctionConflict,
793 "Conflicting arguments: {0}", name);
797 public void DefSubr (Func<Domain, Variable, Term[], Term> builtin,
798 Symbol name, bool with_var,
799 int min_args, int max_args)
801 check_func_head (name, with_var, min_args, max_args, false);
802 functions[name] = new Function.Subroutine (builtin, name, with_var,
806 public void DefSpecial (Func<Domain, Variable, Term[], Term> builtin,
807 Symbol name, bool with_var,
808 int min_args, int max_args)
810 check_func_head (name, with_var, min_args, max_args, false);
811 functions[name] = new Function.SpecialForm (builtin, name, with_var,
815 public void Defun (Symbol name, int min_args, int max_args,
816 Variable[] args, Term[] body)
818 check_func_head (name, false, min_args, max_args, false);
819 functions[name] = new Function.Lambda (name, min_args, max_args,
823 public void Defun (Function func)
825 functions[func.name] = func;
828 public void Defmacro (Symbol name, int min_args, int max_args,
829 Variable[] args, Term[] body)
831 check_func_head (name, false, min_args, max_args, true);
832 functions[name] = new Function.Macro (name, min_args, max_args,
836 public void DefAlias (Symbol alias, Symbol fname)
839 if (termtypes.ContainsKey (alias))
840 throw new Error (Error.FunctionConflict,
841 "Alread defined as a term type: {0}", alias);
842 if (functions.ContainsKey (alias))
843 throw new Error (Error.FunctionConflict,
844 "Alread defined as a function: {0}", alias);
845 if (! functions.TryGetValue (fname, out func))
846 throw new Error (Error.UnknownFunction, fname);
847 functions[alias] = func;
850 public Variable Defvar (Variable vari)
852 vari = vari.Clone (this);
853 variables[vari.name] = vari;
857 internal Variable Defvar (Symbol name)
859 Variable vari = new Variable (this, name, Zero);
860 variables[name] = vari;
864 public Variable DefvarInt (Symbol name, int n, string desc, int[] range)
868 if (variables.TryGetValue (name, out vari))
870 Variable.Int intvari = vari as Variable.Int;
872 throw new Error (Error.VariableTypeConflict,
873 "Not an integer variable: {0}", name);
876 if (! intvari.IsSubrange (range))
877 throw new Error (Error.VariableRangeConflict,
878 "Conflicting variable range: {0}", name);
879 intvari.Range = range;;
882 intvari.Description = desc;
886 vari = new Variable.Int (this, name, n, desc, range);
887 variables[name] = vari;
892 public Variable DefvarStr (Symbol name, string str, string desc,
897 if (variables.TryGetValue (name, out vari))
899 Variable.Str strvari = vari as Variable.Str;
901 throw new Error (Error.VariableTypeConflict,
902 "Not a string variable: {0}", name);
905 if (! strvari.IsSubrange (range))
906 throw new Error (Error.VariableRangeConflict,
907 "Conflicting variable range: {0}", name);
908 strvari.Range = range;
911 strvari.Description = desc;
915 vari = new Variable.Str (this, name, str, desc, range);
916 variables[name] = vari;
921 public Variable DefvarSym (Symbol name, Symbol sym, string desc,
926 if (variables.TryGetValue (name, out vari))
928 Variable.Sym symvari = vari as Variable.Sym;
930 throw new Error (Error.VariableTypeConflict,
931 "Not a symbol variable: {0}", name);
934 if (! symvari.IsSubrange (range))
935 throw new Error (Error.VariableRangeConflict,
936 "Conflicting variable range: {0}", name);
937 symvari.Range = range;
940 symvari.Description = desc;
944 vari = new Variable.Sym (this, name, sym, desc, range);
945 variables[name] = vari;
950 internal Function GetFunc (Symbol name)
953 if (! functions.TryGetValue (name, out func))
954 throw new Error (Error.UnknownFunction,
955 "Unknown function: {0}", name);
959 public bool CopyFunc (Domain domain, Symbol name)
961 Function func = GetFunc (name);
963 domain.functions[name] = func;
967 public void CopyFunc (Domain domain)
969 foreach (KeyValuePair<Symbol, Function> kv in functions)
970 domain.functions[kv.Key] = kv.Value;
973 public Variable GetVar (Symbol name)
977 if (! variables.TryGetValue (name, out vari))
978 variables[name] = vari = new Variable (this, name, Zero);
982 public override string ToString ()
984 string str = "<(functions";
985 foreach (KeyValuePair<Symbol, Function> kv in functions)
987 str += ") (variabls";
988 foreach (KeyValuePair<Symbol, Variable> kv in variables)
989 str += " " + kv.Value;
991 if (bindings != null)
992 str += " " + bindings;
994 str += " (" + context + ")";
999 internal void TraceWrite (string fmt, params string[] arg)
1001 if (trace_depth > depth)
1003 for (int i = 0; i < depth; i++)
1004 Console.Write (" ");
1005 Console.WriteLine (fmt, arg);
1009 public object SaveValues ()
1011 Dictionary<Variable,Term> values = new Dictionary<Variable,Term> ();
1013 foreach (KeyValuePair<Symbol,Variable> kv in variables)
1014 values[kv.Value] = kv.Value.Value.Clone ();
1018 public void RestoreValues (object values)
1020 foreach (KeyValuePair<Variable,Term> kv
1021 in (Dictionary<Variable,Term>) values)
1022 kv.Key.SetValue (kv.Value);
1026 private static Domain basic = new Domain ("basic");
1028 static Xexpression ()
1030 basic.DefType (typeof (Varref));
1031 basic.DefType (typeof (Funcall));
1032 basic.DefType (typeof (ErrorTerm));
1034 basic.DefSubr (Fset, "set", true, 1, 1);
1035 basic.DefAlias ("=", "set");
1036 basic.DefSubr (Fnot, "not", false, 1, 1);
1037 basic.DefAlias ("!", "not");
1038 basic.DefSubr (Fadd, "add", true, 1, -1);
1039 basic.DefAlias ("+", "add");
1040 basic.DefSubr (Fmul, "mul", true, 1, -1);
1041 basic.DefAlias ("*", "mul");
1042 basic.DefSubr (Fsub, "sub", true, 1, -1);
1043 basic.DefAlias ("-", "sub");
1044 basic.DefSubr (Fdiv, "div", true, 1, -1);
1045 basic.DefAlias ("/", "div");
1046 basic.DefSubr (Fmod, "mod", true, 1, 2);
1047 basic.DefAlias ("%", "mod");
1048 basic.DefSubr (Flogior, "logior", true, 1, -1);
1049 basic.DefAlias ("|", "logior");
1050 basic.DefSubr (Flogand, "logand", true, 1, -1);
1051 basic.DefAlias ("&", "logand");
1052 basic.DefSubr (Flsh, "lsh", true, 1, 2);
1053 basic.DefAlias ("<<", "lsh");
1054 basic.DefSubr (Frsh, "rsh", true, 1, 2);
1055 basic.DefAlias (">>", "rsh");
1056 basic.DefSubr (Feq, "eq", false, 2, -1);
1057 basic.DefAlias ("==", "eq");
1058 basic.DefSubr (Fnoteq, "noteq", false, 2, 2);
1059 basic.DefAlias ("!=", "noteq");
1060 basic.DefSubr (Flt, "lt", false, 2, -1);
1061 basic.DefAlias ("<", "lt");
1062 basic.DefSubr (Fle, "le", false, 2, -1);
1063 basic.DefAlias ("<=", "le");
1064 basic.DefSubr (Fgt, "gt", false, 2, -1);
1065 basic.DefAlias (">", "gt");
1066 basic.DefSubr (Fge, "ge", false, 2, -1);
1067 basic.DefAlias (">=", "ge");
1069 basic.DefSubr (Fappend, "append", true, 0, -1);
1070 basic.DefSubr (Fconcat, "concat", true, 0, -1);
1071 basic.DefSubr (Fnth, "nth", false, 2, 2);
1072 basic.DefSubr (Fcopy, "copy", false, 1, 1);
1073 basic.DefSubr (Fins, "ins", true, 2, 2);
1074 basic.DefSubr (Fdel, "del", true, 2, 2);
1075 basic.DefSubr (Feval, "eval", false, 1, 1);
1076 basic.DefSubr (Fbreak, "break", false, 0, 1);
1077 basic.DefSubr (Freturn, "return", false, 0, 1);
1078 basic.DefSubr (Fthrow, "throw", false, 1, 2);
1080 basic.DefSpecial (Fand, "and", false, 1, -1);
1081 basic.DefAlias ("&&", "and");
1082 basic.DefSpecial (For, "or", false, 1, -1);
1083 basic.DefAlias ("||", "or");
1084 basic.DefSpecial (Fprogn, "progn", false, 0, -1);
1085 basic.DefAlias ("expr", "progn");
1086 basic.DefSpecial (Fif, "if", false, 2, 3);
1087 basic.DefSpecial (Fwhen, "when", false, 1, -1);
1088 basic.DefSpecial (Floop, "loop", false, 1, -1);
1089 basic.DefSpecial (Fwhile, "while", false, 1, -1);
1090 basic.DefSpecial (Fcond, "cond", false, 1, -1);
1091 basic.DefSpecial (Fforeach, "foreach", true, 2, -1);
1092 basic.DefSpecial (Fquote, "quote", false, 1, 1);
1093 basic.DefSpecial (Ftype, "type", false, 1, 1);
1094 basic.DefSpecial (Fcatch, "catch", true, 2, -1);
1097 private static Term Fset (Domain domain, Variable vari, Term[] args)
1100 throw new Error (Error.NoVariableName, "No variable name to set");
1101 vari.SetValue (args[0]);
1105 private static Term Fnot (Domain domain, Variable vari, Term[] args)
1107 return args[0].IsTrue ? Zero : One;
1110 static Term maybe_set_intvar (Variable vari, int n)
1112 Term term = new Term (n);
1114 vari.SetValue (term);
1119 private static Term Fadd (Domain domain, Variable vari, Term[] args)
1121 int n = vari == null ? 0 : vari.Value.Intval;
1123 foreach (Term arg in args)
1125 return maybe_set_intvar (vari, n);
1128 private static Term Fmul (Domain domain, Variable vari, Term[] args)
1130 int n = vari == null ? 1 : vari.Value.Intval;
1131 foreach (Term arg in args)
1133 return maybe_set_intvar (vari, n);
1136 private static Term Fsub (Domain domain, Variable vari, Term[] args)
1147 n = vari.Value.Intval;
1150 while (i < args.Length)
1151 n -= args[i++].Intval;
1152 return maybe_set_intvar (vari, n);
1155 private static Term Fdiv (Domain domain, Variable vari, Term[] args)
1166 n = vari.Value.Intval;
1169 while (i < args.Length)
1170 n /= args[i++].Intval;
1171 return maybe_set_intvar (vari, n);
1174 private static Term Fmod (Domain domain, Variable vari, Term[] args)
1176 return maybe_set_intvar (vari, args[0].Intval % args[1].Intval);
1179 private static Term Flogior (Domain domain, Variable vari, Term[] args)
1181 int n = vari == null ? 0 : vari.Value.Intval;
1182 foreach (Term arg in args)
1184 return maybe_set_intvar (vari, n);
1187 private static Term Flogand (Domain domain, Variable vari, Term[] args)
1198 n = vari.Value.Intval;
1201 while (i < args.Length)
1202 n &= args[i++].Intval;
1203 return maybe_set_intvar (vari, n);
1206 private static Term Flsh (Domain domain, Variable vari, Term[] args)
1208 return maybe_set_intvar (vari, args[0].Intval << args[1].Intval);
1211 private static Term Frsh (Domain domain, Variable vari, Term[] args)
1213 return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval);
1216 private static Term Feq (Domain domain, Variable vari, Term[] args)
1220 if (o.objval == null)
1222 for (int i = 1; i < args.Length; i++)
1223 if (args[i].objval != null || args[i].intval != o.intval)
1228 for (int i = 1; i < args.Length; i++)
1229 if (o.objval.Equals (args[i].objval))
1235 private static Term Fnoteq (Domain domain, Variable vari, Term[] args)
1237 return Feq (domain, vari, args);
1240 private static Term Flt (Domain domain, Variable vari, Term[] args)
1242 int n = args[0].Intval;
1244 for (int i = 1; i < args.Length; i++)
1246 int n1 = args[i].Intval;
1254 private static Term Fle (Domain domain, Variable vari, Term[] args)
1256 int n = args[0].Intval;
1257 for (int i = 1; i < args.Length; i++)
1259 int n1 = args[i].Intval;
1267 private static Term Fgt (Domain domain, Variable vari, Term[] args)
1269 int n = args[0].Intval;
1270 for (int i = 1; i < args.Length; i++)
1272 int n1 = args[i].Intval;
1280 private static Term Fge (Domain domain, Variable vari, Term[] args)
1282 int n = args[0].Intval;
1283 for (int i = 1; i < args.Length; i++)
1285 int n1 = args[i].Intval;
1293 private static Term Fappend (Domain domain, Variable vari, Term[] args)
1298 list = new List<Term> ();
1300 list = vari.Value.Listval;
1302 foreach (Term arg in args)
1305 list.AddRange ((List<Term>) arg.objval);
1313 result.objval = list;
1319 private static Term Fconcat (Domain domain, Variable vari, Term[] args)
1326 str = vari.Value.Strval;
1328 foreach (Term arg in args)
1331 str += (string) arg.objval;
1332 else if (arg.IsList)
1333 foreach (Term term in (List<Term>) arg.objval)
1334 str += (char) term.Intval;
1336 str += (char) arg.Intval;
1339 Term strterm = new Term (str);
1341 vari.SetValue (strterm);
1345 private static Term Fnth (Domain domain, Variable vari, Term[] args)
1351 result.intval = ((string) args[1].objval)[args[0].Intval];
1352 result.objval = null;
1354 else if (args[1].IsList)
1356 result = ((List<Term>) args[1].objval)[args[0].Intval];
1359 throw new Error (Error.WrongType,
1360 "Not a string nor a list: {0}", args[1]);
1364 private static Term Fcopy (Domain domain, Variable vari, Term[] args)
1369 result.objval = new List<Term> (args[0].Listval);
1373 private static Term Fins (Domain domain, Variable vari, Term[] args)
1376 throw new Error (Error.NoVariableName, "No variable name to set");
1377 if (vari.Value.IsStr)
1379 = vari.Value.Strval.Insert (args[0].Intval, args[1].Strval);
1380 else if (vari.Value.IsList)
1381 vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval);
1383 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1388 private static Term Fdel (Domain domain, Variable vari, Term[] args)
1391 throw new Error (Error.NoVariableName, "No variable name to set");
1392 Term term = vari.Value;
1394 term.objval = term.Strval.Remove (args[0].Intval,
1395 args[1].Intval - args[0].Intval);
1396 else if (vari.Value.IsList)
1397 vari.Value.Listval.RemoveRange (args[0].Intval,
1398 args[1].Intval - args[0].Intval);
1400 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1405 private static Term Fand (Domain domain, Variable vari, Term[] args)
1407 foreach (Term arg in args)
1408 if (! arg.Eval (domain).IsTrue)
1413 private static Term For (Domain domain, Variable vari, Term[] args)
1415 foreach (Term arg in args)
1416 if (arg.Eval (domain).IsTrue)
1421 private static Term Feval (Domain domain, Variable vari, Term[] args)
1423 return (args[0].Eval (domain));
1426 private static Term Fprogn (Domain domain, Variable vari, Term[] args)
1430 foreach (Term arg in args)
1431 result = arg.Eval (domain);
1435 private static Term Fif (Domain domain, Variable vari, Term[] args)
1437 if (args[0].Eval (domain).IsTrue)
1438 return args[1].Eval (domain);
1439 if (args.Length == 2)
1441 return args[2].Eval (domain);
1444 private static Term Fwhen (Domain domain, Variable vari, Term[] args)
1446 if (! args[0].Eval (domain).IsTrue)
1449 for (int i = 1; i < args.Length; i++)
1450 result = args[i].Eval (domain);
1454 private static Term Freturn (Domain domain, Variable vari, Term[] args)
1456 domain.ThrowReturn ();
1457 return args.Length == 0 ? Zero : args[0];
1460 private static Term Fbreak (Domain domain, Variable vari, Term[] args)
1462 domain.ThrowBreak ();
1463 return args.Length == 0 ? Zero : args[0];
1466 private static Term Floop (Domain domain, Variable vari, Term[] args)
1470 domain.Catch (CatchTag.Break);
1471 while (! domain.Thrown ())
1472 foreach (Term arg in args)
1474 result = arg.Eval (domain);
1475 if (domain.Thrown ())
1484 private static Term Fwhile (Domain domain, Variable vari, Term[] args)
1488 domain.Catch (CatchTag.Break);
1489 while (! domain.Thrown () && args[0].Eval (domain).IsTrue)
1490 for (int i = 1; i < args.Length; i++)
1492 result = args[i].Eval (domain);
1493 if (domain.Thrown ())
1502 private static Term Fcond (Domain domain, Variable vari, Term[] args)
1504 foreach (Term arg in args)
1506 List<Term> list = arg.Listval;
1507 Term result = list[0].Eval (domain);
1511 for (int i = 1; i < list.Count; i++)
1514 result = list[i].Eval (domain);
1516 if (domain.Thrown ())
1525 private static Term Fforeach (Domain domain, Variable vari, Term[] args)
1527 Term result = args[0].Eval (domain);
1528 if (domain.Thrown ())
1530 List<Term> list = result.Listval;
1531 Bindings current = domain.bindings;
1534 domain.Catch (CatchTag.Break);
1535 foreach (Term term in list)
1537 domain.Bind (vari, term);
1539 for (int i = 1; i < args.Length; i++)
1541 result = args[i].Eval (domain);
1542 if (domain.Thrown ())
1546 domain.UnboundTo (current);
1555 private static Term Fquote (Domain domain, Variable vari, Term[] args)
1560 private static Term Ftype (Domain domain, Variable vari, Term[] args)
1566 if (args[0].IsSymbol)
1573 private static Term eval_terms (Domain domain, Term[] terms, int idx,
1579 for (int i = idx; i < terms.Length; i++)
1581 result = terms[i].Eval (domain);
1582 if (domain.Thrown (out caught))
1588 public static Term Fcatch (Domain domain, Variable vari, Term[] args)
1591 bool caught = false;
1593 if (args.Length < 2)
1594 throw new Error (Error.WrongArgument,
1595 "Too few arguments: {0}", args.Length);
1596 ErrorTerm err = args[0].objval as ErrorTerm;
1600 result = eval_terms (domain, args, 1, out caught);
1601 } catch (System.Exception exception) {
1604 Error e = exception as Error;
1606 term = new Term (new ErrorTerm (e.Name, e.Message, e.Stack));
1608 term = new Term (new ErrorTerm (exception));
1609 if (! args[0].Matches (term))
1612 vari.SetValue (term);
1616 else if (args[0].IsSymbol)
1619 domain.Catch (new CatchTag (args[0].Symval));
1620 result = eval_terms (domain, args, 1, out caught);
1624 vari.SetValue (result);
1632 throw new Error (Error.WrongArgument,
1633 "Not a symbol nor an error: {0}", args[0]);
1636 public static Term Fthrow (Domain domain, Variable vari, Term[] args)
1638 if (args[0].IsSymbol)
1640 domain.ThrowSymbol (args[0]);
1641 return (args[args.Length - 1]);
1643 if (args[0].IsError)
1645 ErrorTerm err = (ErrorTerm) args[0].objval;
1646 throw new Error (err.ErrorName, err.ErrorMessage);
1648 throw new Error (Error.WrongArgument,
1649 "Not a symbol nor an error: {0}", args[0]);
1652 public abstract class TermValue
1654 public virtual Term Eval (Domain domain) { return new Term (this); }
1655 public virtual TermValue Clone () { return this; }
1656 public virtual bool IsTrue { get { return true; } }
1657 public virtual bool Matches (TermValue other) { return Equals (other); }
1658 public override abstract bool Equals (object obj);
1659 public override abstract int GetHashCode ();
1660 public abstract string ToString (bool detail);
1663 private class Varref : TermValue
1665 private static Symbol name = "varref";
1666 public static Symbol Name { get { return name; } }
1668 private Symbol vname;
1669 private Variable vari;
1671 public Varref (Symbol vname) { this.vname = vname; }
1673 public override Term Eval (Domain domain)
1675 if (vari == null || vari.domain != domain)
1676 vari = domain.GetVar (vname);
1680 public static TermValue Parser (Domain domain, XmlNode node)
1682 return new Varref ((Symbol) node.Attributes[Qvname].Value);
1685 public override bool Equals (object obj)
1687 Varref varref = obj as Varref;
1688 return (varref != null && varref.vari.name == vari.name);
1691 public override int GetHashCode ()
1693 return vari.name.GetHashCode ();
1696 public override string ToString () { return ToString (true); }
1698 public override string ToString (bool detail)
1700 return "<varref vname=\"" + vname + "\"/>";
1704 private class Funcall : TermValue
1706 private static Symbol name = "funcall";
1707 public static Symbol Name { get { return name; } }
1709 internal Function func;
1710 internal Variable vari;
1711 internal Term[] args;
1713 public Funcall (Function func, Variable vari, Term[] args)
1715 int nargs = args.Length;
1717 if (nargs < func.min_args
1718 || (func.max_args >= 0 && nargs > func.max_args))
1719 throw new Error (Error.WrongArgument,
1720 "Wrong number of arguments to {0}: {1}",
1722 if (! func.with_var && vari != null)
1723 throw new Error (Error.WrongArgument,
1724 "Wrong vname attribute to {0}: {1}",
1725 func.name, vari.name);
1731 public static TermValue Parser (Domain domain, XmlNode node)
1733 Symbol fname = node.Name;
1736 if (fname == Qfuncall)
1737 fname = node.Attributes[Qfname].Value;
1738 Function func = domain.GetFunc (fname);
1740 attr = node.Attributes[Qvname];
1741 vari = attr == null ? null : domain.GetVar (attr.Value);
1742 XmlNodeList nlist = node.ChildNodes;
1743 int nargs = nlist.Count;
1744 Term[] args = new Term[nargs];
1745 for (int i = 0; i < nargs; i++)
1746 args[i] = Parse (domain, nlist[i]);
1747 return new Funcall (func, vari, args);
1750 public override Term Eval (Domain domain)
1753 domain.TraceWrite (ToString ());
1756 result = func.Call (domain, vari, args);
1760 domain.TraceWrite ("=> {0}", result.ToString ());
1764 public override TermValue Clone ()
1766 return new Funcall (func, vari, args);
1769 public override bool Equals (object obj)
1771 Funcall funcall = obj as Funcall;
1773 && funcall.func == func
1774 && funcall.vari == vari
1775 && funcall.args.Length == args.Length);
1778 public override int GetHashCode ()
1780 return func.GetHashCode () ^ args.Length;
1783 public override string ToString () { return ToString (true); }
1785 public override string ToString (bool detail)
1787 string str = "<" + func.name;
1790 str += " vname=\"" + vari.name + "\"";
1792 str += " val=" + vari.Value.ToString ();
1794 if (args.Length == 0 || ! detail)
1797 if (func is Function.SpecialForm)
1799 for (int i = 0; i < args.Length; i++)
1803 foreach (Term e in args)
1805 return (str + "</" + func.name + ">");
1809 internal class ErrorTerm : TermValue
1811 private static Symbol name = "error";
1812 public static Symbol Name { get { return name; } }
1814 private readonly Symbol ename;
1815 public Symbol ErrorName { get { return ename; } }
1816 private string message;
1817 public string ErrorMessage { get { return message; } }
1818 private Term[] stack;
1820 public ErrorTerm (Symbol ename, string message)
1821 : this (ename, message, null) { }
1823 internal ErrorTerm (Symbol ename, string message, Term[] stack)
1826 this.message = message;
1830 internal ErrorTerm (Exception e)
1832 if (e is ArithmeticException)
1833 ename = Error.ArithmeticError;
1834 else if (e is IndexOutOfRangeException)
1835 ename = Error.IndexOutOfRange;
1836 else if (e is InsufficientMemoryException
1837 || e is OutOfMemoryException)
1838 ename = Error.MemoryError;
1840 ename = Error.UnknownError;
1841 message = e.Message;
1844 public static TermValue Parser (Domain domain, XmlNode node)
1846 XmlAttribute attr = node.Attributes[Qename];
1847 Symbol ename = attr == null ? Qnull : (Symbol) attr.Value;
1848 string message = node.InnerText;
1849 return new ErrorTerm (ename, message);
1852 public Term[] CallStack {
1853 get { return stack; }
1854 internal set { stack = value; }
1857 public override TermValue Clone ()
1859 return new ErrorTerm (ename, message);
1862 public override bool Equals (object obj)
1864 ErrorTerm e = obj as ErrorTerm;
1865 return (e != null && e.ename == ename && e.message == message
1866 && (e.stack == null ? stack == null
1867 : (stack != null && e.stack.Length == stack.Length)));
1870 public override int GetHashCode ()
1872 return ename.GetHashCode ();
1875 public override bool Matches (TermValue term)
1877 ErrorTerm e = term as ErrorTerm;
1878 return (e != null && (ename == Qnull || e.ename == ename));
1881 public override string ToString () { return ToString (true); }
1883 public override string ToString (bool detail)
1885 string str = "<error type=\"" + ename + "\">";
1886 if (message != null)
1889 for (int i = 0; i < stack.Length; i++)
1890 str += stack[i].ToString (false);
1891 return str + "</error>";
1895 internal class CharSeq
1898 private Regex regex;
1900 public CharSeq (string str) { this.str = str; }
1901 public Insert (int index, string str)
1903 this.str = this.str.Insert (index, str);
1905 public Delete (int from, int to)
1907 this.str = this.str.Remove (from, to - from);
1914 public object objval;
1916 // <integer>...</integer>
1917 public Term (int i) { intval = i; objval = null; }
1918 // <symbol>...</symbol>
1919 public Term (Symbol name) { intval = 0; objval = name; }
1920 // <string>...</string>
1921 public Term (string str) { intval = 0; objval = new StringBuilder (str); }
1923 public Term (List<Term> list) { intval = 0; objval = list; }
1924 // <error ename="ERROR-NAME">ERROR-MESSASGE</error>
1925 public Term (Symbol name, string message)
1928 objval = new ErrorTerm (name, message);
1931 public Term (TermValue obj) { intval = 0; objval = obj; }
1933 // <varref vname="VNAME"/>
1934 public Term (Domain domain, Symbol vname)
1937 objval = new Varref (vname);
1940 // <funcall fname="FNAME">...</funcall>
1941 public Term (Domain domain, Symbol fname, Term[] args)
1942 : this (domain, fname, Qnull, args) { }
1944 // <funcall fname="FNAME" vname="VNAME">...</funcall>
1945 public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
1949 Function func = domain.GetFunc (fname);
1950 Variable vari = vname == Qnull ? null : domain.GetVar (vname);
1951 Funcall funcall = new Funcall (func, vari, args);
1952 if (func is Function.Macro)
1954 Term result = funcall.Eval (domain);
1955 intval = result.intval;
1956 objval = result.objval;
1962 public object Objval {
1965 throw new Error (Error.WrongType,
1966 "term is an integer: {0}", this);
1974 throw new Error (Error.WrongType, "{0} is not an integer", this);
1979 public string Strval {
1982 throw new Error (Error.WrongType, "{0} is not a string", this);
1983 return (StringBuilder) objval;
1987 public string Symval {
1990 throw new Error (Error.WrongType, "{0} is not a symbol", this);
1991 return (Symbol) objval;
1995 public List<Term> Listval {
1998 throw new Error (Error.WrongType, "{0} is not a list");
1999 return (List<Term>) objval;
2003 public bool IsTrue {
2005 return (objval == null
2007 : objval is List<Term>
2008 ? (((List<Term>) objval).Count != 0)
2009 : objval is TermValue
2010 ? ((TermValue) objval).IsTrue
2015 public bool IsInt { get { return (objval == null); } }
2016 public bool IsStr { get { return (objval is StringBuilder); } }
2017 public bool IsSymbol { get { return (objval is Symbol); } }
2018 public bool IsList { get { return (objval is List<Term>); } }
2019 public bool IsError { get { return (objval is ErrorTerm); } }
2021 internal Term Eval (Domain domain)
2023 if (objval == null || objval is Symbol || objval is string
2024 || objval is List<Term>)
2027 domain.CallStackPush (this);
2028 return ((TermValue) objval).Eval (domain);
2030 if (e.Stack == null)
2031 e.Stack = domain.CallStack;
2034 domain.CallStackPop ();
2038 public Term Clone ()
2040 if (objval == null || objval is Symbol)
2042 if (objval is StringBuilder)
2043 return new Term (((StringBuilder) objval).ToString ());
2044 if (objval is List<Term>)
2046 List<Term> list = new List<Term> ();
2047 list.InsertRange (0, ((List<Term>) objval));
2048 return new Term (list);
2050 return new Term (((TermValue) objval).Clone ());
2053 public static bool operator== (Term t1, Term t2)
2055 return t1.Equals (t2);
2058 public static bool operator!= (Term t1, Term t2) { return ! (t1 == t2); }
2060 public override bool Equals (object obj)
2062 if (! (obj is Term))
2064 Term term = (Term) obj;
2066 return term.IsInt && term.Intval == Intval;
2068 return term.IsSymbol && term.Symval == Symval;
2071 && term.Strval.Length = Strval.Length
2072 && (Strval.Length == 0
2073 || (term.Strval.Chars[0] == Strval.Chars[0]
2074 && term.Strval.ToString () == Strval.ToString ())));
2079 List<Term> l1 = objval as List<Term>;
2080 List<Term> l2 = term.objval as List<Term>;
2082 if (l1.Count != l2.Count)
2084 for (int i = 0; i < l1.Count; i++)
2085 if (! l1[i].Equals (l2[i]))
2089 return ((TermValue) objval).Equals (obj);
2092 public override int GetHashCode () { return intval; }
2094 public bool Matches (Term term)
2097 return term.IsInt && term.Intval == Intval;
2099 return term.IsSymbol && term.Symval == Symval;
2101 return term.IsStr && term.Strval == Strval;
2106 List<Term> l1 = objval as List<Term>;
2107 List<Term> l2 = term.objval as List<Term>;
2109 if (l1.Count > l2.Count)
2111 for (int i = 0; i < l1.Count; i++)
2112 if (! l1[i].Equals (l2[i]))
2116 return ((TermValue) objval).Matches ((TermValue) term.objval);
2119 public override string ToString () { return ToString (true); }
2121 public string ToString (bool detail)
2126 str = "<integer>" + intval + "</integer>";
2127 else if (objval is Symbol)
2128 str = "<symbol>" + objval + "</symbol>";
2129 else if (objval is string)
2130 str = "<string>" + objval + "</string>";
2131 else if (objval is List<Term>)
2136 foreach (Term e in (List<Term>) objval)
2143 else if (objval is Term)
2144 str = "<quote>" + objval + "</quote>";
2146 str = ((TermValue) objval).ToString (detail);
2151 private static Term Zero = new Term (0);
2152 private static Term One = new Term (1);
2153 private static Term TermInt = new Term (Qinteger);
2154 private static Term TermStr = new Term (Qstring);
2155 private static Term TermSymbol = new Term (Qsymbol);
2156 private static Term TermList = new Term (Qlist);
2157 private static Term TermTerm = new Term ((Symbol) "term");
2159 private static int parse_integer (XmlNode node)
2161 string str = node.InnerText;
2162 int len = str.Length;
2165 if (len == 2 && str[0] == '?')
2168 && str[1] == 'x' && ((c = str[0]) == '0' || c == '#'))
2170 if (! int.TryParse (str.Substring (2),
2171 Globalization.NumberStyles.HexNumber, null,
2173 throw new Error (Error.InvalidInteger, node,
2174 "Not a integer string: {0}", str);
2177 if (! int.TryParse (str, out i))
2178 throw new Error (Error.InvalidInteger, node,
2179 "Not a integer string: {0}", str);
2183 private static Symbol parse_defvar (Domain domain, XmlNode node)
2185 XmlAttribute name = node.Attributes[Qvname];
2187 throw new Error (Error.NoVariableName, node,
2188 "No variable name to define");
2189 Symbol vname = name.Value;
2193 node = node.FirstChild;
2194 if (node != null && node.Name == Qdescription)
2196 desc = node.InnerText;
2197 node = node.NextSibling;
2203 Symbol type = node.Name;
2204 XmlNodeList range_list = null;
2206 XmlNode n = node.NextSibling;
2210 range_list = n.ChildNodes;
2211 nranges = range_list.Count;
2214 if (type == Qinteger)
2216 int val = parse_integer (node);
2218 if (range_list != null)
2220 range = new int[nranges * 2];
2221 for (int i = 0; i < nranges; i++)
2223 XmlNode nd = range_list[i];
2224 if (nd.Name == Qrange)
2226 range[i * 2] = parse_integer (nd.FirstChild);
2227 range[i * 2 + 1] = parse_integer (nd.LastChild);
2231 range[i * 2] = range[i * 2 + 1]
2232 = parse_integer (nd.FirstChild);
2236 vari = domain.DefvarInt (vname, val, desc, range);
2238 else if (type == Qstring)
2240 string[] range = null;
2241 if (range_list != null)
2243 range = new string[nranges];
2244 for (int i = 0; i < nranges; i++)
2245 range[i] = range_list[i].FirstChild.InnerText;
2247 vari = domain.DefvarStr (vname, node.InnerText, desc, range);
2249 else if (type == Qsymbol)
2251 Symbol[] range = null;
2252 if (range_list != null)
2254 range = new Symbol[nranges];
2255 for (int i = 0; i < nranges; i++)
2256 range[i] = range_list[i].FirstChild.InnerText;
2258 vari = domain.DefvarSym (vname, (Symbol) node.InnerText, desc,
2262 throw new Error (Error.TermTypeInvalid, "Unknown type: {0}", type);
2266 if (domain.variables.TryGetValue (vname, out vari))
2267 vari = vari.Clone (domain);
2269 vari = new Variable (domain, vname, Zero);
2270 domain.variables[vname] = vari;
2275 private static Variable[] parse_args (Domain domain, XmlNode node,
2276 out int min_args, out int max_args)
2283 node = node.FirstChild;
2284 if (node != null && node.Name == Qargs)
2287 for (n = node.FirstChild; n != null; n = n.NextSibling)
2289 if (n.Name == Qfixed)
2291 else if (n.Name == Qoptional)
2293 else if (n.Name == Qrest)
2296 throw new Error (Error.WrongType, n, "Too many <rest>");
2300 throw new Error (Error.WrongType, n,
2301 "Not fixed, optional, nor rest: {0}", n.Name);
2304 max_args = nfixed + noptional + nrest;
2305 args = new Variable[max_args];
2306 n = node.FirstChild;
2307 for (int i = 0; i < max_args; n = n.NextSibling)
2308 args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value);
2310 max_args = - max_args;
2314 min_args = max_args = 0;
2315 args = new Variable[0];
2320 public static Symbol parse_defun_head (Domain domain, XmlNode node)
2322 Symbol name = node.Attributes[Qfname].Value;
2323 int min_args, max_args;
2326 args = parse_args (domain, node, out min_args, out max_args);
2327 if (node.Name == Qdefun)
2328 domain.Defun (name, min_args, max_args, args, null);
2330 domain.Defmacro (name, min_args, max_args, args, null);
2334 public static void parse_defun_body (Domain domain, XmlNode node)
2336 bool is_defun = node.Name == Qdefun;
2337 Symbol name = node.Attributes[Qfname].Value;
2338 Function func = domain.GetFunc (name);
2340 for (node = node.FirstChild; node != null; node = node.NextSibling)
2341 if (node.Name != Qdescription
2342 && node.Name != Qargs)
2344 Term[] body = Parse (domain, node, null);
2346 ((Function.Lambda) func).SetBody (body);
2348 ((Function.Macro) func).SetBody (body);
2351 public static Term Parse (Domain domain, XmlNode node)
2353 Symbol name = node.Name;
2356 if (name == Qinteger)
2357 return new Term (parse_integer (node));
2358 if (name == Qsymbol)
2359 return new Term ((Symbol) node.InnerText);
2360 if (name == Qstring)
2361 return new Term (node.InnerText);
2364 List<Term> list = new List<Term> ();
2365 for (node = node.FirstChild; node != null;
2366 node = node.NextSibling)
2367 list.Add (Parse (domain, node));
2368 return new Term (list);
2370 if (name == Qdefun || name == Qdefmacro)
2372 name = parse_defun_head (domain, node);
2373 parse_defun_body (domain, node);
2374 return new Term (name);
2376 if (name == Qdefvar)
2378 name = parse_defvar (domain, node);
2379 return new Term (name);
2382 if (domain.termtypes.TryGetValue (name, out parser))
2384 object[] arg = new object[] { domain, node };
2385 return new Term ((TermValue) parser.Invoke (null, arg));
2388 Funcall funcall = (Funcall) Funcall.Parser (domain, node);
2389 if (funcall.func is Function.Macro)
2390 return funcall.Eval (domain);
2391 return new Term (funcall);
2396 } catch (Exception e) {
2397 throw new Error (Error.UnknownError, node, e, "Parsing error");
2401 private static bool default_stop (XmlNode n) { return n == null; }
2403 public static Term[] Parse (Domain domain, XmlNode node,
2404 Func<XmlNode, bool> stop)
2407 stop = default_stop;
2410 for (n = node; ! stop (n); n = n.NextSibling)
2411 if (n.NodeType == XmlNodeType.Element
2412 && (n.Name == Qdefun || n.Name == Qdefmacro))
2415 parse_defun_head (domain, n);
2420 } catch (Exception e) {
2421 throw new Error (Error.UnknownError, node, e, "Parsing error");
2425 List<Term> terms = new List<Term> ();
2426 for (; node != n; node = node.NextSibling)
2427 if (node.NodeType == XmlNodeType.Element)
2430 if (node.Name == Qdefun || node.Name == Qdefmacro)
2431 parse_defun_body (domain, node);
2432 else if (node.Name == Qdefvar)
2433 parse_defvar (domain, node);
2435 terms.Add (Parse (domain, node));
2440 } catch (Exception e) {
2441 throw new Error (Error.UnknownError, node, e, "Parsing error");
2444 return terms.ToArray ();
2447 public static Term[] Parse (Domain domain, string url)
2449 XmlDocument doc = new XmlDocument (Symbol.NameTable);
2452 using (XmlTextReader reader = new XmlTextReader (url, doc.NameTable))
2456 } while (reader.NodeType != XmlNodeType.None
2457 && (reader.NodeType != XmlNodeType.Element
2458 || reader.Name != Qexpr));
2459 if (reader.NodeType == XmlNodeType.None)
2460 throw new Exception ("Node <expr> not found");
2461 node = doc.ReadNode (reader);
2463 return Parse (domain, node.FirstChild, null);
2466 public static Term Eval (Domain domain, Term[] terms)
2471 foreach (Term term in terms)
2473 result = term.Eval (domain);
2474 if (domain.Thrown ())
2480 } catch (Exception e) {
2481 throw new Error (Error.UnknownError, null, e, "Runtime error");