2 using System.Collections;
3 using System.Collections.Generic;
5 using System.Reflection;
7 using System.Text.RegularExpressions;
13 /// Static class to provide XmlExpression loader and evaluator.
15 public static class Xexpression
18 /// Exception thrown while loading and evaluating XmlExpression.
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";
89 public static Symbol UnknownFunction = "unknown-function";
90 public static Symbol MacroExpansionError = "macro-expansion-error";
91 public static Symbol NoVariableName = "no-variable-anme";
94 public static Symbol ArithmeticError = "arithmetic-error";
95 public static Symbol WrongType = "wrong-type";
96 public static Symbol IndexOutOfRange = "index-out-of-range";
97 public static Symbol ValueOutOfRange = "value-out-of-range";
98 public static Symbol NoLoopToBreak = "no-loop-to-break";
99 public static Symbol UncaughtThrow = "uncaught-throw";
102 public struct Symbol : IEquatable<Symbol>
104 private static NameTable nt = new NameTable ();
108 public Symbol (string str) { name = nt.Add (str); }
110 public static implicit operator Symbol (string str)
112 return new Symbol (str);
115 public static implicit operator string (Symbol sym) { return sym.name; }
117 public static bool operator== (Symbol n1, Symbol n2)
119 return (object) n1.name == (object) n2.name;
122 public static bool operator!= (Symbol n1, Symbol n2)
124 return (object) n1.name != (object) n2.name;
127 public static bool operator== (Symbol n1, string n2)
129 return (object) n1.name == (object) n2;
132 public static bool operator!= (Symbol n1, string n2)
134 return (object) n1.name != (object) n2;
137 public static bool operator== (string n1, Symbol n2)
139 return (object) n1 == (object) n2.name;
142 public static bool operator!= (string n1, Symbol n2)
144 return (object) n1 != (object) n2.name;
147 public bool Equals (Symbol name)
149 return Object.ReferenceEquals (this.name, name.name);
152 public override bool Equals (object obj)
154 return (obj is Symbol ? this == (Symbol) obj
155 : obj is string ? this.name == (string) obj
159 public override int GetHashCode ()
161 return name.GetHashCode ();
164 public static NameTable NameTable { get { return nt; } }
166 public override string ToString () { return name; }
169 private static Symbol Qexpr = "expr";
171 private static Symbol Qnull = "";
172 private static Symbol Qfuncall = "funcall";
173 private static Symbol Qinteger = "integer";
174 private static Symbol Qstring = "string";
175 private static Symbol Qsymbol = "symbol";
176 private static Symbol Qlist = "list";
178 public static Symbol Qdefun = "defun";
179 public static Symbol Qdefmacro = "defmacro";
180 private static Symbol Qfname = "fname";
181 private static Symbol Qargs = "args";
182 private static Symbol Qfixed = "fixed";
183 private static Symbol Qoptional = "optional";
184 private static Symbol Qrest = "rest";
186 public static Symbol Qdefvar = "defvar";
187 private static Symbol Qvname = "vname";
188 private static Symbol Qdescription = "description";
189 private static Symbol Qrange = "range";
191 private static Symbol Qename = "ename";
193 public class Variable
195 public Domain domain;
196 public readonly Symbol name;
199 public Variable (Domain domain, Symbol name, Term val)
201 this.domain = domain;
206 public Term Value { get { return val; } }
208 public virtual Term SetValue (Term val) { this.val = val; return val; }
210 public virtual Variable Clone (Domain domain)
212 return new Variable (domain, name, val);
215 public virtual void Reset () { val = Zero; }
217 public override string ToString () { return name + "(" + val + ")"; }
219 public abstract class Typed : Variable
221 protected string desc;
222 private Term default_val;
224 protected Typed (Domain domain, Symbol name, Term val, string desc)
225 : base (domain, name, val)
231 public override void Reset () { val = default_val; }
233 public string Description {
235 set { desc = value; }
238 public override Term SetValue (Term val)
240 if (! CheckValue (val))
241 throw new Error (Error.VariableWrongValue,
242 "Wrong value for variable {0}: {1}",
248 public abstract bool CheckValue (Term val);
251 public class IntType : Typed
255 public IntType (Domain domain, Symbol name, int n, string desc,
257 : base (domain, name, new Term (n), desc)
259 if (range != null && range.Length % 2 == 1)
260 throw new Error (Error.VariableWrongRange,
261 "Range length for {0} not even", name);
266 public override bool CheckValue (Term term)
273 for (int i = 0; i < range.Length; i += 2)
274 if (range[i] <= n && range[i + 1] >= n)
280 public override Variable Clone (Domain domain)
282 return new IntType (domain, name, val.Intval, desc, range);
285 public int[] Range { get { return range; } set { range = value; } }
288 public class StrType : Typed
290 private string[] range;
292 public StrType (Domain domain, Symbol name, Str str, string desc,
294 : base (domain, name, new Term (str), desc)
300 public override bool CheckValue (Term val)
306 Str str = val.Strval;
307 foreach (string s in range)
314 public override Variable Clone (Domain domain)
316 return new StrType (domain, name, val.Strval, desc, range);
319 public string[] Range { get { return range; } set { range = value; } }
322 public class SymType : Typed
324 public Symbol[] range;
326 public SymType (Domain domain, Symbol name, Symbol sym, string desc,
328 : base (domain, name, new Term (sym), desc)
334 public override bool CheckValue (Term val)
340 Symbol sym = val.Symval;
341 foreach (Symbol n in range)
348 public override Variable Clone (Domain domain)
350 return new SymType (domain, name, val.Symval, desc, range);
353 public Symbol[] Range { get { return range; } set { range = value; } }
357 public abstract class Function
360 // True iff the function can be called with vname="VNAME" attribute.
361 internal readonly bool with_var;
362 // Minimum number of positional arguments.
363 internal readonly int min_args;
364 // If non-nengative, maximum number of arguments. If negative,
365 // maxinum number of positional arguments is (-1 - max_args),
366 // and the remaining unlimit number of arguments are given as a
368 internal readonly int max_args;
370 public delegate Term Builtin (Domain domain, Variable vari, Term[] terms);
372 public Function () { }
374 public Function (Symbol name, bool with_var, int min_args, int max_args)
377 this.with_var = with_var;
378 this.min_args = min_args;
379 this.max_args = max_args;
382 public abstract Term Call (Domain domain, Variable vari, Term[] args);
384 public override string ToString ()
389 internal class Subroutine : Function
391 public Builtin builtin;
393 public Subroutine (Builtin builtin, Symbol name, bool with_var,
394 int min_args, int max_args)
395 : base (name, with_var, min_args, max_args)
397 this.builtin = builtin;
400 public override Term Call (Domain domain, Variable vari, Term[] args)
404 args = (Term[]) args.Clone ();
405 for (int i = 0; i < args.Length; i++)
407 args[i] = args[i].Eval (domain);
408 if (domain.Thrown ())
412 return builtin (domain, vari, args);
416 internal class SpecialForm : Function
418 public Builtin builtin;
420 public SpecialForm (Builtin builtin, Symbol name, bool with_var,
421 int min_args, int max_args)
422 : base (name, with_var, min_args, max_args)
424 this.builtin = builtin;
427 public override Term Call (Domain domain, Variable vari, Term[] args)
429 return builtin (domain, vari, args);
433 internal class Lambda : Function
435 private Variable[] args;
438 public Lambda (Symbol name, int min_args, int max_args, Variable[] args,
440 : base (name, false, min_args, max_args)
446 public void SetBody (Term[] body)
451 public override Term Call (Domain domain, Variable vari, Term[] args)
453 Bindings current = domain.bindings;
455 int limit = max_args >= 0 ? args.Length : args.Length - 1;
458 for (int i = 0; i < limit; i++)
460 result = args[i].Eval (domain);
461 if (domain.Thrown ())
463 domain.Bind (this.args[i], result);
467 List<Term> list = new List<Term> ();
468 list.InsertRange (0, args[limit].Listval);
470 for (int i = 0; i < list.Count; i++)
472 result = list[i].Eval (domain);
473 if (domain.Thrown ())
477 domain.Bind (this.args[limit], new Term (list));
480 domain.Catch (CatchTag.Return);
481 foreach (Term term in body)
483 result = term.Eval (domain);
484 if (domain.Thrown ())
491 domain.UnboundTo (current);
497 internal class Macro : Function
499 private Variable[] args;
502 public Macro (Symbol name, int min_args, int max_args, Variable[] args,
504 : base (name, false, min_args, max_args)
510 public void SetBody (Term[] body)
515 public override Term Call (Domain domain, Variable vari, Term[] args)
517 Bindings current = domain.bindings;
521 for (int i = 0; i < args.Length; i++)
522 domain.Bind (this.args[i], args[i]);
524 domain.Catch (CatchTag.Return);
525 foreach (Term term in body)
527 result = term.Eval (domain);
528 if (domain.Thrown ())
535 domain.UnboundTo (current);
542 internal class Bindings
544 private Variable vari;
545 private Term old_value;
546 private Bindings next;
548 private Bindings (Variable vari)
551 old_value = vari.Value;
554 public static Bindings Bind (Bindings bindings, Variable vari, Term val)
556 Bindings b = new Bindings (vari);
558 b.vari.SetValue (val);
563 internal Bindings UnboundTo (Bindings boundary)
565 for (Bindings b = this; b != boundary; b = b.next)
566 b.vari.SetValue (b.old_value);
570 public override string ToString ()
572 string str = "(bindings";
573 for (Bindings b = this; b != null; b = b.next)
574 str += " " + vari.name + "=" + b.old_value;
579 internal struct CatchTag
582 public Term Tag { get { return tag; } }
584 // Normal symbolic catch-tag.
585 public CatchTag (Symbol sym) { tag = new Term (sym); }
586 // Special catch-tag for return and break.
587 private CatchTag (int i) { tag = new Term (i); }
589 public static CatchTag Return = new CatchTag (0);
590 public static CatchTag Break = new CatchTag (1);
596 public object context;
597 public int depth = 0;
598 private Stack<Term> call_stack = new Stack<Term> ();
600 internal Dictionary<Symbol, MethodInfo> termtypes
601 = new Dictionary<Symbol, MethodInfo> ();
602 internal Dictionary<Symbol, Function> functions
603 = new Dictionary<Symbol, Function> ();
604 internal Dictionary<Symbol, Variable> variables
605 = new Dictionary<Symbol, Variable> ();
606 internal Bindings bindings;
607 private Stack<CatchTag> catch_stack = new Stack<CatchTag> ();
608 private int catch_count = 0;
610 internal Domain (Symbol name) { this.name = name; }
612 public Domain (Symbol name, object context)
613 : this (name, basic, context) { }
615 public Domain (Symbol name, Domain parent, object context) : this (name)
617 termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
618 functions = new Dictionary<Symbol, Function> (parent.functions);
619 variables = new Dictionary<Symbol, Variable> (parent.variables);
620 this.context = context;
623 public int CallStackCount { get { return call_stack.Count; } }
625 public void CallStackPush (Term term) { call_stack.Push (term); }
627 public void CallStackPop () { call_stack.Pop (); }
629 public void CallStackPop (int count)
631 while (count < call_stack.Count)
635 public Term[] CallStack { get { return call_stack.ToArray (); } }
637 internal void Bind (Variable vari, Term value)
639 bindings = Bindings.Bind (bindings, vari, value);
642 internal void UnboundTo (Bindings boundary)
644 if (bindings != null)
645 bindings = bindings.UnboundTo (boundary);
648 internal void Catch (CatchTag tag)
650 catch_stack.Push (tag);
654 internal void Uncatch ()
657 if (catch_count > catch_stack.Count)
661 public bool Thrown () { return catch_count < catch_stack.Count; }
663 public bool Thrown (out bool caught)
665 if (catch_count < catch_stack.Count)
667 caught = catch_count == catch_stack.Count - 1;
674 internal void ThrowReturn ()
676 foreach (CatchTag elt in catch_stack)
679 if (elt.Tag == CatchTag.Return.Tag)
684 internal void ThrowBreak ()
686 if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
687 throw new Error (Error.NoLoopToBreak,
688 "No surrounding loop to break");
692 internal void ThrowSymbol (Term tag)
695 foreach (CatchTag elt in catch_stack)
698 if (elt.Tag.Matches (tag))
704 throw new Error (Error.UncaughtThrow,
705 "No corresponding catch: {0}", tag);
708 public void DefType (Type type)
710 if (! type.IsSubclassOf (typeof (TermValue)))
711 throw new Error (Error.TermTypeInvalid,
712 "Not a subclass of TermValue: {0}", type);
713 BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
714 FieldInfo finfo = type.GetField ("name", flags);
715 if (finfo == null || finfo.FieldType != typeof (Symbol))
716 throw new Error (Error.TermTypeInvalid,
717 "No \"name\" field of string type: {0}", type);
718 Symbol name = (Symbol) finfo.GetValue (null);
719 if (termtypes.ContainsKey (name))
720 throw new Error (Error.TermTypeInvalid,
721 "Already defined: {0}", name);
722 if (functions.ContainsKey (name))
723 throw new Error (Error.TermTypeInvalid,
724 "Already defined as a function or a macro: {0}",
726 Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
727 MethodInfo parser = type.GetMethod ("Parser", types);
728 if (parser == null || parser.ReturnType != typeof (TermValue))
729 throw new Error (Error.TermTypeInvalid,
730 "No \"Parser\" method of correct type: {0}", type);
731 termtypes[name] = parser;
734 private void check_func_head (Symbol name, bool with_var,
735 int min_args, int max_args, bool as_macro)
737 if (termtypes.ContainsKey (name))
738 throw new Error (Error.FunctionConflict,
739 "Already defined as a term type: {0}", name);
741 if (functions.TryGetValue (name, out func))
743 if ((func is Function.Macro) != as_macro)
744 throw new Error (Error.FunctionConflict,
745 "Already defined as a {0}: {1}",
746 as_macro ? "function" : "macro", name);
747 if (func.with_var != with_var
748 || func.min_args != min_args
749 || func.max_args != max_args)
750 throw new Error (Error.FunctionConflict,
751 "Conflicting arguments: {0}", name);
755 public void DefSubr (Function.Builtin builtin, Symbol name,
756 bool with_var, int min_args, int max_args)
758 check_func_head (name, with_var, min_args, max_args, false);
759 functions[name] = new Function.Subroutine (builtin, name, with_var,
763 public void DefSpecial (Function.Builtin builtin, Symbol name,
764 bool with_var, int min_args, int max_args)
766 check_func_head (name, with_var, min_args, max_args, false);
767 functions[name] = new Function.SpecialForm (builtin, name, with_var,
771 public void Defun (Symbol name, int min_args, int max_args,
772 Variable[] args, Term[] body)
774 check_func_head (name, false, min_args, max_args, false);
775 functions[name] = new Function.Lambda (name, min_args, max_args,
779 public void Defun (Function func)
781 functions[func.name] = func;
784 public void Defmacro (Symbol name, int min_args, int max_args,
785 Variable[] args, Term[] body)
787 check_func_head (name, false, min_args, max_args, true);
788 functions[name] = new Function.Macro (name, min_args, max_args,
792 public void DefAlias (Symbol alias, Symbol fname)
795 if (termtypes.ContainsKey (alias))
796 throw new Error (Error.FunctionConflict,
797 "Alread defined as a term type: {0}", alias);
798 if (functions.ContainsKey (alias))
799 throw new Error (Error.FunctionConflict,
800 "Alread defined as a function: {0}", alias);
801 if (! functions.TryGetValue (fname, out func))
802 throw new Error (Error.UnknownFunction, fname);
803 functions[alias] = func;
806 public Variable Defvar (Variable vari)
808 vari = vari.Clone (this);
809 variables[vari.name] = vari;
813 internal Variable Defvar (Symbol name)
817 if (variables.TryGetValue (name, out vari))
819 Variable.Typed typed = vari as Variable.Typed;
821 throw new Error (Error.VariableTypeConflict,
822 "Not a non-typed variable: {0}", name);
826 vari = new Variable (this, name, Zero);
827 variables[name] = vari;
832 public Variable Defvar (Symbol name, int n, string desc, int[] range)
836 if (variables.TryGetValue (name, out vari))
838 Variable.IntType intvari = vari as Variable.IntType;
840 throw new Error (Error.VariableTypeConflict,
841 "Not an integer variable: {0}", name);
843 intvari.Range = range;;
845 intvari.Description = desc;
849 vari = new Variable.IntType (this, name, n, desc, range);
850 variables[name] = vari;
855 public Variable Defvar (Symbol name, Symbol sym, string desc,
860 if (variables.TryGetValue (name, out vari))
862 Variable.SymType symvari = vari as Variable.SymType;
864 throw new Error (Error.VariableTypeConflict,
865 "Not a symbol variable: {0}", name);
867 symvari.Range = range;
869 symvari.Description = desc;
873 vari = new Variable.SymType (this, name, sym, desc, range);
874 variables[name] = vari;
879 public Variable Defvar (Symbol name, string str, string desc,
884 if (variables.TryGetValue (name, out vari))
886 Variable.StrType strvari = vari as Variable.StrType;
888 throw new Error (Error.VariableTypeConflict,
889 "Not a string variable: {0}", name);
891 strvari.Range = range;
893 strvari.Description = desc;
897 vari = new Variable.StrType (this, name, new Str (str), desc,
899 variables[name] = vari;
904 internal Function GetFunc (Symbol name)
907 if (! functions.TryGetValue (name, out func))
908 throw new Error (Error.UnknownFunction,
909 "Unknown function: {0}", name);
913 public bool CopyFunc (Domain domain, Symbol name)
915 Function func = GetFunc (name);
917 domain.functions[name] = func;
921 public void CopyFunc (Domain domain)
923 foreach (KeyValuePair<Symbol, Function> kv in functions)
924 domain.functions[kv.Key] = kv.Value;
927 public Variable GetVarCreate (Symbol name)
931 if (! variables.TryGetValue (name, out vari))
932 variables[name] = vari = new Variable (this, name, Zero);
936 public Variable GetVar (Symbol name)
940 if (! variables.TryGetValue (name, out vari))
945 public override string ToString ()
947 string str = "<(functions";
948 foreach (KeyValuePair<Symbol, Function> kv in functions)
950 str += ") (variabls";
951 foreach (KeyValuePair<Symbol, Variable> kv in variables)
952 str += " " + kv.Value;
954 if (bindings != null)
955 str += " " + bindings;
957 str += " (" + context + ")";
962 internal void TraceWrite (string fmt, params string[] arg)
964 if (trace_depth > depth)
966 for (int i = 0; i < depth; i++)
968 Console.WriteLine (fmt, arg);
972 public object SaveValues ()
974 Dictionary<Variable,Term> values = new Dictionary<Variable,Term> ();
976 foreach (KeyValuePair<Symbol,Variable> kv in variables)
977 values[kv.Value] = kv.Value.Value.Clone ();
981 public void RestoreValues (object values)
983 foreach (KeyValuePair<Variable,Term> kv
984 in (Dictionary<Variable,Term>) values)
985 kv.Key.SetValue (kv.Value);
989 private static Domain basic = new Domain ("basic");
991 static Xexpression ()
993 basic.DefType (typeof (Varref));
994 basic.DefType (typeof (Funcall));
995 basic.DefType (typeof (ErrorTerm));
997 basic.DefSubr (Fset, "set", true, 1, 1);
998 basic.DefAlias ("=", "set");
999 basic.DefSubr (Fnot, "not", false, 1, 1);
1000 basic.DefAlias ("!", "not");
1001 basic.DefSubr (Fadd, "add", true, 1, -1);
1002 basic.DefAlias ("+", "add");
1003 basic.DefSubr (Fmul, "mul", true, 1, -1);
1004 basic.DefAlias ("*", "mul");
1005 basic.DefSubr (Fsub, "sub", true, 1, -1);
1006 basic.DefAlias ("-", "sub");
1007 basic.DefSubr (Fdiv, "div", true, 1, -1);
1008 basic.DefAlias ("/", "div");
1009 basic.DefSubr (Fmod, "mod", true, 1, 2);
1010 basic.DefAlias ("%", "mod");
1011 basic.DefSubr (Flogior, "logior", true, 1, -1);
1012 basic.DefAlias ("|", "logior");
1013 basic.DefSubr (Flogand, "logand", true, 1, -1);
1014 basic.DefAlias ("&", "logand");
1015 basic.DefSubr (Flsh, "lsh", true, 1, 2);
1016 basic.DefAlias ("<<", "lsh");
1017 basic.DefSubr (Frsh, "rsh", true, 1, 2);
1018 basic.DefAlias (">>", "rsh");
1019 basic.DefSubr (Feq, "eq", false, 2, -1);
1020 basic.DefAlias ("==", "eq");
1021 basic.DefSubr (Fnoteq, "noteq", false, 2, 2);
1022 basic.DefAlias ("!=", "noteq");
1023 basic.DefSubr (Flt, "lt", false, 2, -1);
1024 basic.DefAlias ("<", "lt");
1025 basic.DefSubr (Fle, "le", false, 2, -1);
1026 basic.DefAlias ("<=", "le");
1027 basic.DefSubr (Fgt, "gt", false, 2, -1);
1028 basic.DefAlias (">", "gt");
1029 basic.DefSubr (Fge, "ge", false, 2, -1);
1030 basic.DefAlias (">=", "ge");
1032 basic.DefSubr (Fappend, "append", true, 0, -1);
1033 basic.DefSubr (Fconcat, "concat", true, 0, -1);
1034 basic.DefSubr (Fnth, "nth", false, 2, 2);
1035 basic.DefSubr (Fcopy, "copy", false, 1, 1);
1036 basic.DefSubr (Fins, "ins", true, 2, 2);
1037 basic.DefSubr (Fdel, "del", true, 2, 2);
1038 basic.DefSubr (Feval, "eval", false, 1, 1);
1039 basic.DefSubr (Fbreak, "break", false, 0, 1);
1040 basic.DefSubr (Freturn, "return", false, 0, 1);
1041 basic.DefSubr (Fthrow, "throw", false, 1, 2);
1043 basic.DefSpecial (Fand, "and", false, 1, -1);
1044 basic.DefAlias ("&&", "and");
1045 basic.DefSpecial (For, "or", false, 1, -1);
1046 basic.DefAlias ("||", "or");
1047 basic.DefSpecial (Fprogn, "progn", false, 0, -1);
1048 basic.DefAlias ("expr", "progn");
1049 basic.DefSpecial (Fif, "if", false, 2, 3);
1050 basic.DefSpecial (Fwhen, "when", false, 1, -1);
1051 basic.DefSpecial (Floop, "loop", false, 1, -1);
1052 basic.DefSpecial (Fwhile, "while", false, 1, -1);
1053 basic.DefSpecial (Fcond, "cond", false, 1, -1);
1054 basic.DefSpecial (Fforeach, "foreach", true, 2, -1);
1055 basic.DefSpecial (Fquote, "quote", false, 1, 1);
1056 basic.DefSpecial (Ftype, "type", false, 1, 1);
1057 basic.DefSpecial (Fcatch, "catch", true, 2, -1);
1060 private static Term Fset (Domain domain, Variable vari, Term[] args)
1063 throw new Error (Error.NoVariableName, "No variable name to set");
1064 vari.SetValue (args[0]);
1068 private static Term Fnot (Domain domain, Variable vari, Term[] args)
1070 return args[0].IsTrue ? Zero : One;
1073 static Term maybe_set_intvar (Variable vari, int n)
1075 Term term = new Term (n);
1077 vari.SetValue (term);
1082 private static Term Fadd (Domain domain, Variable vari, Term[] args)
1084 int n = vari == null ? 0 : vari.Value.Intval;
1086 foreach (Term arg in args)
1088 return maybe_set_intvar (vari, n);
1091 private static Term Fmul (Domain domain, Variable vari, Term[] args)
1093 int n = vari == null ? 1 : vari.Value.Intval;
1094 foreach (Term arg in args)
1096 return maybe_set_intvar (vari, n);
1099 private static Term Fsub (Domain domain, Variable vari, Term[] args)
1110 n = vari.Value.Intval;
1113 while (i < args.Length)
1114 n -= args[i++].Intval;
1115 return maybe_set_intvar (vari, n);
1118 private static Term Fdiv (Domain domain, Variable vari, Term[] args)
1129 n = vari.Value.Intval;
1132 while (i < args.Length)
1133 n /= args[i++].Intval;
1134 return maybe_set_intvar (vari, n);
1137 private static Term Fmod (Domain domain, Variable vari, Term[] args)
1139 return maybe_set_intvar (vari, args[0].Intval % args[1].Intval);
1142 private static Term Flogior (Domain domain, Variable vari, Term[] args)
1144 int n = vari == null ? 0 : vari.Value.Intval;
1145 foreach (Term arg in args)
1147 return maybe_set_intvar (vari, n);
1150 private static Term Flogand (Domain domain, Variable vari, Term[] args)
1161 n = vari.Value.Intval;
1164 while (i < args.Length)
1165 n &= args[i++].Intval;
1166 return maybe_set_intvar (vari, n);
1169 private static Term Flsh (Domain domain, Variable vari, Term[] args)
1171 return maybe_set_intvar (vari, args[0].Intval << args[1].Intval);
1174 private static Term Frsh (Domain domain, Variable vari, Term[] args)
1176 return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval);
1179 private static Term Feq (Domain domain, Variable vari, Term[] args)
1183 if (o.objval == null)
1185 for (int i = 1; i < args.Length; i++)
1186 if (args[i].objval != null || args[i].intval != o.intval)
1191 for (int i = 1; i < args.Length; i++)
1192 if (o.objval.Equals (args[i].objval))
1198 private static Term Fnoteq (Domain domain, Variable vari, Term[] args)
1200 return Feq (domain, vari, args);
1203 private static Term Flt (Domain domain, Variable vari, Term[] args)
1205 int n = args[0].Intval;
1207 for (int i = 1; i < args.Length; i++)
1209 int n1 = args[i].Intval;
1217 private static Term Fle (Domain domain, Variable vari, Term[] args)
1219 int n = args[0].Intval;
1220 for (int i = 1; i < args.Length; i++)
1222 int n1 = args[i].Intval;
1230 private static Term Fgt (Domain domain, Variable vari, Term[] args)
1232 int n = args[0].Intval;
1233 for (int i = 1; i < args.Length; i++)
1235 int n1 = args[i].Intval;
1243 private static Term Fge (Domain domain, Variable vari, Term[] args)
1245 int n = args[0].Intval;
1246 for (int i = 1; i < args.Length; i++)
1248 int n1 = args[i].Intval;
1256 private static Term Fappend (Domain domain, Variable vari, Term[] args)
1261 list = new List<Term> ();
1263 list = vari.Value.Listval;
1265 foreach (Term arg in args)
1268 list.AddRange ((List<Term>) arg.objval);
1276 result.objval = list;
1282 private static Term Fconcat (Domain domain, Variable vari, Term[] args)
1284 Str str = vari == null ? new Str ("") : vari.Value.Strval;
1286 foreach (Term arg in args)
1289 str.Insert (-1, arg.Strval);
1290 else if (arg.IsList)
1291 foreach (Term term in arg.Listval)
1292 str.Insert (-1, (char) term.Intval);
1294 str.Insert (-1, (char) arg.Intval);
1296 return vari == null ? new Term (str) : vari.Value;
1299 private static Term Fnth (Domain domain, Variable vari, Term[] args)
1302 return new Term (args[1].Strval.Nth (args[0].Intval));
1304 return args[1].Listval[args[0].Intval];
1305 throw new Error (Error.WrongType,
1306 "Not a string nor a list: {0}", args[1]);
1309 private static Term Fcopy (Domain domain, Variable vari, Term[] args)
1311 return args[0].Clone ();
1314 private static Term Fins (Domain domain, Variable vari, Term[] args)
1317 throw new Error (Error.NoVariableName, "No variable name to set");
1318 if (vari.Value.IsStr)
1319 vari.Value.Strval.Insert (args[0].Intval, args[1].Strval);
1320 else if (vari.Value.IsList)
1321 vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval);
1323 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1328 private static Term Fdel (Domain domain, Variable vari, Term[] args)
1331 throw new Error (Error.NoVariableName, "No variable name to set");
1332 if (vari.Value.IsStr)
1333 vari.Value.Strval.Delete (args[0].Intval, args[1].Intval);
1334 else if (vari.Value.IsList)
1335 vari.Value.Listval.RemoveRange (args[0].Intval,
1336 args[1].Intval - args[0].Intval);
1338 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1343 private static Term Fand (Domain domain, Variable vari, Term[] args)
1345 foreach (Term arg in args)
1347 Term result = arg.Eval (domain);
1348 if (domain.Thrown ())
1350 if (! result.IsTrue)
1356 private static Term For (Domain domain, Variable vari, Term[] args)
1358 foreach (Term arg in args)
1360 Term result = arg.Eval (domain);
1361 if (domain.Thrown ())
1369 private static Term Feval (Domain domain, Variable vari, Term[] args)
1371 return (args[0].Eval (domain));
1374 private static Term Fprogn (Domain domain, Variable vari, Term[] args)
1378 foreach (Term arg in args)
1380 result = arg.Eval (domain);
1381 if (domain.Thrown ())
1387 private static Term Fif (Domain domain, Variable vari, Term[] args)
1389 Term result = args[0].Eval (domain);
1391 if (domain.Thrown ())
1394 return args[1].Eval (domain);
1395 if (args.Length == 2)
1397 return args[2].Eval (domain);
1400 private static Term Fwhen (Domain domain, Variable vari, Term[] args)
1402 Term result = args[0].Eval (domain);
1404 if (domain.Thrown ())
1406 if (! result.IsTrue)
1409 for (int i = 1; i < args.Length; i++)
1411 result = args[i].Eval (domain);
1412 if (domain.Thrown ())
1418 private static Term Freturn (Domain domain, Variable vari, Term[] args)
1420 domain.ThrowReturn ();
1421 return args.Length == 0 ? Zero : args[0];
1424 private static Term Fbreak (Domain domain, Variable vari, Term[] args)
1426 domain.ThrowBreak ();
1427 return args.Length == 0 ? Zero : args[0];
1430 private static Term Floop (Domain domain, Variable vari, Term[] args)
1434 domain.Catch (CatchTag.Break);
1435 while (! domain.Thrown ())
1436 foreach (Term arg in args)
1438 result = arg.Eval (domain);
1439 if (domain.Thrown ())
1448 private static Term Fwhile (Domain domain, Variable vari, Term[] args)
1452 domain.Catch (CatchTag.Break);
1453 while (! domain.Thrown () && args[0].Eval (domain).IsTrue)
1454 for (int i = 1; i < args.Length; i++)
1456 result = args[i].Eval (domain);
1457 if (domain.Thrown ())
1466 private static Term Fcond (Domain domain, Variable vari, Term[] args)
1468 foreach (Term arg in args)
1470 List<Term> list = arg.Listval;
1471 Term result = list[0].Eval (domain);
1475 for (int i = 1; i < list.Count; i++)
1478 result = list[i].Eval (domain);
1480 if (domain.Thrown ())
1489 private static Term Fforeach (Domain domain, Variable vari, Term[] args)
1491 Term result = args[0].Eval (domain);
1492 if (domain.Thrown ())
1494 List<Term> list = result.Listval;
1495 Bindings current = domain.bindings;
1498 domain.Catch (CatchTag.Break);
1499 foreach (Term term in list)
1501 domain.Bind (vari, term);
1503 for (int i = 1; i < args.Length; i++)
1505 result = args[i].Eval (domain);
1506 if (domain.Thrown ())
1510 domain.UnboundTo (current);
1519 private static Term Fquote (Domain domain, Variable vari, Term[] args)
1524 private static Term Ftype (Domain domain, Variable vari, Term[] args)
1530 if (args[0].IsSymbol)
1537 private static Term eval_terms (Domain domain, Term[] terms, int idx,
1543 for (int i = idx; i < terms.Length; i++)
1545 result = terms[i].Eval (domain);
1546 if (domain.Thrown (out caught))
1552 public static Term Fcatch (Domain domain, Variable vari, Term[] args)
1555 bool caught = false;
1557 if (args.Length < 2)
1558 throw new Error (Error.WrongArgument,
1559 "Too few arguments: {0}", args.Length);
1560 ErrorTerm err = args[0].objval as ErrorTerm;
1564 result = eval_terms (domain, args, 1, out caught);
1565 } catch (System.Exception exception) {
1568 Error e = exception as Error;
1570 term = new Term (new ErrorTerm (e.Name, e.Message, e.Stack));
1572 term = new Term (new ErrorTerm (exception));
1573 if (! args[0].Matches (term))
1576 vari.SetValue (term);
1580 else if (args[0].IsSymbol)
1583 domain.Catch (new CatchTag (args[0].Symval));
1584 result = eval_terms (domain, args, 1, out caught);
1588 vari.SetValue (result);
1596 throw new Error (Error.WrongArgument,
1597 "Not a symbol nor an error: {0}", args[0]);
1600 public static Term Fthrow (Domain domain, Variable vari, Term[] args)
1602 if (args[0].IsSymbol)
1604 domain.ThrowSymbol (args[0]);
1605 return (args[args.Length - 1]);
1607 if (args[0].IsError)
1609 ErrorTerm err = (ErrorTerm) args[0].objval;
1610 throw new Error (err.ErrorName, err.ErrorMessage);
1612 throw new Error (Error.WrongArgument,
1613 "Not a symbol nor an error: {0}", args[0]);
1616 public abstract class TermValue
1618 public virtual Term Eval (Domain domain) { return new Term (this); }
1619 public virtual TermValue Clone () { return this; }
1620 public virtual bool IsTrue { get { return true; } }
1621 public virtual bool Matches (TermValue other) { return Equals (other); }
1622 public override abstract bool Equals (object obj);
1623 public override abstract int GetHashCode ();
1624 public virtual string ToString (bool detail) { return ToString (); }
1627 private class Varref : TermValue
1629 private static Symbol name = "varref";
1630 public static Symbol Name { get { return name; } }
1632 private Symbol vname;
1633 private Variable vari;
1635 public Varref (Symbol vname) { this.vname = vname; }
1637 public override Term Eval (Domain domain)
1639 if (vari == null || vari.domain != domain)
1640 vari = domain.GetVarCreate (vname);
1644 public static TermValue Parser (Domain domain, XmlNode node)
1646 return new Varref ((Symbol) node.Attributes[Qvname].Value);
1649 public override bool Equals (object obj)
1651 Varref varref = obj as Varref;
1652 return (varref != null && varref.vari.name == vari.name);
1655 public override int GetHashCode ()
1657 return vari.name.GetHashCode ();
1660 public override string ToString () { return ToString (true); }
1662 public override string ToString (bool detail)
1664 return "<varref vname=\"" + vname + "\"/>";
1668 private class Funcall : TermValue
1670 private static Symbol name = "funcall";
1671 public static Symbol Name { get { return name; } }
1672 private static Term[] null_args = new Term[0];
1674 internal Function func;
1675 internal Variable vari;
1676 internal Term[] args;
1678 public Funcall (Function func, Variable vari, Term[] args)
1682 int nargs = args.Length;
1683 if (nargs < func.min_args
1684 || (func.max_args >= 0 && nargs > func.max_args))
1685 throw new Error (Error.WrongArgument,
1686 "Wrong number of arguments to {0}: {1}",
1688 if (! func.with_var && vari != null)
1689 throw new Error (Error.WrongArgument,
1690 "Wrong vname attribute to {0}: {1}",
1691 func.name, vari.name);
1697 public static TermValue Parser (Domain domain, XmlNode node)
1699 Symbol fname = node.Name;
1702 if (fname == Qfuncall)
1703 fname = node.Attributes[Qfname].Value;
1704 Function func = domain.GetFunc (fname);
1706 attr = node.Attributes[Qvname];
1707 vari = attr == null ? null : domain.GetVarCreate (attr.Value);
1708 XmlNodeList nlist = node.ChildNodes;
1709 int nargs = nlist.Count;
1710 Term[] args = new Term[nargs];
1711 for (int i = 0; i < nargs; i++)
1712 args[i] = Parse (domain, nlist[i]);
1713 return new Funcall (func, vari, args);
1716 public override Term Eval (Domain domain)
1719 domain.TraceWrite (ToString ());
1722 result = func.Call (domain, vari, args);
1726 domain.TraceWrite ("=> {0}", result.ToString ());
1730 public override TermValue Clone ()
1732 return new Funcall (func, vari, args);
1735 public override bool Equals (object obj)
1737 Funcall funcall = obj as Funcall;
1739 && funcall.func == func
1740 && funcall.vari == vari
1741 && funcall.args.Length == args.Length);
1744 public override int GetHashCode ()
1746 return func.GetHashCode () ^ args.Length;
1749 public override string ToString () { return ToString (true); }
1751 public override string ToString (bool detail)
1753 string str = "<" + func.name;
1756 str += " vname=\"" + vari.name + "\"";
1758 str += " val=" + vari.Value.ToString ();
1760 if (args.Length == 0 || ! detail)
1763 if (func is Function.SpecialForm)
1765 for (int i = 0; i < args.Length; i++)
1769 foreach (Term e in args)
1771 return (str + "</" + func.name + ">");
1775 internal class ErrorTerm : TermValue
1777 private static Symbol name = "error";
1778 public static Symbol Name { get { return name; } }
1780 private readonly Symbol ename;
1781 public Symbol ErrorName { get { return ename; } }
1782 private string message;
1783 public string ErrorMessage { get { return message; } }
1784 private Term[] stack;
1786 public ErrorTerm (Symbol ename, string message)
1787 : this (ename, message, null) { }
1789 internal ErrorTerm (Symbol ename, string message, Term[] stack)
1792 this.message = message;
1796 internal ErrorTerm (Exception e)
1798 if (e is ArithmeticException)
1799 ename = Error.ArithmeticError;
1800 else if (e is IndexOutOfRangeException)
1801 ename = Error.IndexOutOfRange;
1802 else if (e is InsufficientMemoryException
1803 || e is OutOfMemoryException)
1804 ename = Error.MemoryError;
1806 ename = Error.UnknownError;
1807 message = e.Message;
1810 public static TermValue Parser (Domain domain, XmlNode node)
1812 XmlAttribute attr = node.Attributes[Qename];
1813 Symbol ename = attr == null ? Qnull : (Symbol) attr.Value;
1814 string message = node.InnerText;
1815 return new ErrorTerm (ename, message);
1818 public Term[] CallStack {
1819 get { return stack; }
1820 internal set { stack = value; }
1823 public override TermValue Clone ()
1825 return new ErrorTerm (ename, message);
1828 public override bool Equals (object obj)
1830 ErrorTerm e = obj as ErrorTerm;
1831 return (e != null && e.ename == ename && e.message == message
1832 && (e.stack == null ? stack == null
1833 : (stack != null && e.stack.Length == stack.Length)));
1836 public override int GetHashCode ()
1838 return ename.GetHashCode ();
1841 public override bool Matches (TermValue term)
1843 ErrorTerm e = term as ErrorTerm;
1844 return (e != null && (ename == Qnull || e.ename == ename));
1847 public override string ToString () { return ToString (true); }
1849 public override string ToString (bool detail)
1851 string str = "<error type=\"" + ename + "\">";
1852 if (message != null)
1855 for (int i = 0; i < stack.Length; i++)
1856 str += stack[i].ToString (false);
1857 return str + "</error>";
1864 private Regex regex;
1866 public Str (string str) { this.str = str; }
1868 public Str Clone (Str str) { return new Str (str.str); }
1870 public bool Equals (string str) { return this.str == str; }
1872 public bool Equals (Str str) { return this.str == str.str; }
1874 public bool Matches (Str str)
1877 regex = new Regex (this.str);
1878 return regex.IsMatch (str.str);
1881 public int Nth (int index) { return (int) str[index]; }
1883 public void Insert (int index, Str str)
1886 this.str = this.str + str.str;
1888 this.str = this.str.Insert (index, str.str);
1892 public void Insert (int index, char c)
1895 this.str = this.str + c;
1897 this.str = this.str.Insert (index, new string (c, 1));
1901 public void Delete (int from, int to)
1903 this.str = this.str.Remove (from, to - from);
1907 public override string ToString () { return str; }
1910 /// <summary> Structure of term object.</summary>
1913 internal int intval;
1914 internal object objval;
1916 /// <summary>Create an integer term.</summary>
1917 /// <param name='i'>Integer value of the term.</param>
1918 /// <returns>An integer term.</returns>
1919 /// <remarks>Create an integer term that has the integer value
1920 /// specified by <paramref name="i"/>. This is an constant
1921 /// term; i.e. the integer value never changes.</remarks>
1922 public Term (int i) { intval = i; objval = null; }
1924 /// <summary>Create a symbol term.</summary>
1925 /// <param name='name'>Symbol value of the term.</param>
1926 /// <returns>A symbol term.</returns>
1927 /// <remarks>Create a symbol term that has the symbol value
1928 /// specified by <paramref name="name"/>. This is an constant
1929 /// term; i.e. the symbol value never changes. It is evaluated
1930 /// to itself.</remarks>
1931 public Term (Symbol name) { intval = 0; objval = name; }
1933 /// <summary>Create a string term.</summary>
1934 /// <param name='str'>String value of the term.</param>
1935 /// <returns>A string term.</returns>
1936 /// <remarks>Create a string term that has the string value
1937 /// specified by <paramref name="str"/>. It is evaluated to
1938 /// itself. The string value can be modified by "ins", "del",
1939 /// and "concat" functions.</remarks>
1940 public Term (string str) { intval = 0; objval = new Str (str); }
1943 /// <summary>Create a list term.</summary>
1944 /// <param name='list'>List value of the term.</param>
1945 /// <returns>A list term.</returns>
1946 /// <remarks>Create a list term that has the list value
1947 /// specified by <paramref name="list"/>. It is evaluated to
1948 /// itself. The list value can be modified by "ins", "del", and
1949 /// "append" functions.</remarks>
1950 public Term (List<Term> list) { intval = 0; objval = list; }
1951 // <error ename="ERROR-NAME">ERROR-MESSASGE</error>
1953 /// <summary>Create an error term.</summary>
1954 /// <param name='name'>Name of the error.</param>
1955 /// <param name='message'>Error message.</param>
1956 /// <returns>An error term.</returns>
1957 /// <remarks>Create an error term whose error name is <paramref
1958 /// name="name"/> and error message is <paramref
1959 /// name="message"/>. It is evaluated to itself.</remarks>
1960 public Term (Symbol name, string message)
1963 objval = new ErrorTerm (name, message);
1966 /// <summary>Create a term of a specific value</summary>
1967 /// <param name='val'>Value of the term.</param>
1968 /// <returns>A term.</returns>
1969 /// <remarks>Create a term whose value is <paramref name="val"/>.
1970 /// It is evaluated to a term that is returned by "Eval" method
1971 /// of <paramref name="val"/>.</remarks>
1972 public Term (TermValue val) { intval = 0; objval = val; }
1974 internal Term (Str str) { intval = 0; objval = str; }
1976 /// <summary>Create a varref term.</summary>
1977 /// <param name='domain'>Domain to create the term in.</param>
1978 /// <param name='vname'>Name of the referred variable.</param>
1979 /// <returns>A varref term.</returns>
1980 /// <remarks>Create a varref term that is evaluated to the value
1981 /// of the referring variable.</remarks>
1982 public Term (Domain domain, Symbol vname)
1985 objval = new Varref (vname);
1988 /// <summary>Create a funcall term.</summary>
1989 /// <param name='domain'>Domain to create the term in.</param>
1990 /// <param name='fname'>Name of the calling function.</param>
1991 /// <param name='args'>Array of terms that are given to the
1992 /// function as arguments.</param>
1993 /// <returns>A funcall term.</returns>
1994 /// <remarks>Create a funcall term that is evaluated to a term
1995 /// returned by the function <paramref name="fname"/> when called
1996 /// with <paramref name="args"/>.</remarks>
1997 public Term (Domain domain, Symbol fname, Term[] args)
1998 : this (domain, fname, Qnull, args) { }
2000 // <funcall fname="FNAME" vname="VNAME">...</funcall>
2001 public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
2005 Function func = domain.GetFunc (fname);
2006 Variable vari = vname == Qnull ? null : domain.GetVarCreate(vname);
2007 Funcall funcall = new Funcall (func, vari, args);
2008 if (func is Function.Macro)
2010 Term result = funcall.Eval (domain);
2011 intval = result.intval;
2012 objval = result.objval;
2018 public object Objval {
2021 throw new Error (Error.WrongType,
2022 "term is an integer: {0}", this);
2030 throw new Error (Error.WrongType, "{0} is not an integer", this);
2038 throw new Error (Error.WrongType, "{0} is not a string", this);
2039 return (Str) objval;
2043 public string Symval {
2046 throw new Error (Error.WrongType, "{0} is not a symbol", this);
2047 return (Symbol) objval;
2051 public List<Term> Listval {
2054 throw new Error (Error.WrongType, "{0} is not a list");
2055 return (List<Term>) objval;
2059 public bool IsTrue {
2061 return (objval == null
2063 : objval is List<Term>
2064 ? (((List<Term>) objval).Count != 0)
2065 : objval is TermValue
2066 ? ((TermValue) objval).IsTrue
2071 public bool IsInt { get { return (objval == null); } }
2072 public bool IsStr { get { return (objval is Str); } }
2073 public bool IsSymbol { get { return (objval is Symbol); } }
2074 public bool IsList { get { return (objval is List<Term>); } }
2075 public bool IsError { get { return (objval is ErrorTerm); } }
2077 internal Term Eval (Domain domain)
2079 if (objval == null || objval is Symbol || objval is Str
2080 || objval is List<Term>)
2083 domain.CallStackPush (this);
2084 return ((TermValue) objval).Eval (domain);
2086 if (e.Stack == null)
2087 e.Stack = domain.CallStack;
2090 domain.CallStackPop ();
2094 public Term Clone ()
2096 if (objval == null || objval is Symbol)
2099 return new Term (((Str) objval).ToString ());
2100 if (objval is List<Term>)
2102 List<Term> list = new List<Term> ();
2103 list.InsertRange (0, ((List<Term>) objval));
2104 return new Term (list);
2106 return new Term (((TermValue) objval).Clone ());
2109 public static bool operator== (Term t1, Term t2)
2111 return t1.Equals (t2);
2114 public static bool operator!= (Term t1, Term t2) { return ! (t1 == t2); }
2116 public override bool Equals (object obj)
2118 if (! (obj is Term))
2120 Term term = (Term) obj;
2122 return term.IsInt && term.Intval == Intval;
2124 return term.IsSymbol && term.Symval == Symval;
2126 return (term.IsStr && term.Strval.Equals (Strval));
2131 List<Term> l1 = objval as List<Term>;
2132 List<Term> l2 = term.objval as List<Term>;
2134 if (l1.Count != l2.Count)
2136 for (int i = 0; i < l1.Count; i++)
2137 if (! l1[i].Equals (l2[i]))
2141 return ((TermValue) objval).Equals (obj);
2144 public override int GetHashCode () { return intval; }
2146 public bool Matches (Term term)
2149 return term.IsInt && Intval == term.Intval;
2151 return term.IsSymbol && Symval == term.Symval;
2153 return term.IsStr && Strval.Matches (term.Strval);
2158 List<Term> l1 = objval as List<Term>;
2159 List<Term> l2 = term.objval as List<Term>;
2161 if (l1.Count > l2.Count)
2163 for (int i = 0; i < l1.Count; i++)
2164 if (! l1[i].Equals (l2[i]))
2168 return ((TermValue) objval).Matches ((TermValue) term.objval);
2171 public override string ToString () { return ToString (true); }
2173 public string ToString (bool detail)
2178 str = "<integer>" + intval + "</integer>";
2179 else if (objval is Symbol)
2180 str = "<symbol>" + objval + "</symbol>";
2181 else if (objval is Str)
2182 str = "<string>" + objval + "</string>";
2183 else if (objval is List<Term>)
2188 foreach (Term e in (List<Term>) objval)
2195 else if (objval is Term)
2196 str = "<quote>" + objval + "</quote>";
2198 str = ((TermValue) objval).ToString (detail);
2203 private static Term Zero = new Term (0);
2204 private static Term One = new Term (1);
2205 private static Term TermInt = new Term (Qinteger);
2206 private static Term TermStr = new Term (Qstring);
2207 private static Term TermSymbol = new Term (Qsymbol);
2208 private static Term TermList = new Term (Qlist);
2209 private static Term TermTerm = new Term ((Symbol) "term");
2211 private static int parse_integer (XmlNode node)
2213 string str = node.InnerText;
2214 int len = str.Length;
2217 if (len == 2 && str[0] == '?')
2220 && str[1] == 'x' && ((c = str[0]) == '0' || c == '#'))
2222 if (! int.TryParse (str.Substring (2),
2223 Globalization.NumberStyles.HexNumber, null,
2225 throw new Error (Error.InvalidInteger, node,
2226 "Not a integer string: {0}", str);
2229 if (! int.TryParse (str, out i))
2230 throw new Error (Error.InvalidInteger, node,
2231 "Not a integer string: {0}", str);
2235 private static Symbol parse_defvar (Domain domain, XmlNode node)
2237 XmlAttribute name = node.Attributes[Qvname];
2239 throw new Error (Error.NoVariableName, node,
2240 "No variable name to define");
2241 Symbol vname = name.Value;
2245 node = node.FirstChild;
2246 if (node != null && node.Name == Qdescription)
2248 desc = node.InnerText;
2249 node = node.NextSibling;
2255 Symbol type = node.Name;
2256 XmlNodeList range_list = null;
2258 XmlNode n = node.NextSibling;
2262 range_list = n.ChildNodes;
2263 nranges = range_list.Count;
2266 if (type == Qinteger)
2268 int val = parse_integer (node);
2270 if (range_list != null)
2272 range = new int[nranges * 2];
2273 for (int i = 0; i < nranges; i++)
2275 XmlNode nd = range_list[i];
2276 if (nd.Name == Qrange)
2278 range[i * 2] = parse_integer (nd.FirstChild);
2279 range[i * 2 + 1] = parse_integer (nd.LastChild);
2283 range[i * 2] = range[i * 2 + 1]
2284 = parse_integer (nd.FirstChild);
2288 vari = domain.Defvar (vname, val, desc, range);
2290 else if (type == Qstring)
2292 string[] range = null;
2293 if (range_list != null)
2295 range = new string[nranges];
2296 for (int i = 0; i < nranges; i++)
2297 range[i] = range_list[i].FirstChild.InnerText;
2299 vari = domain.Defvar (vname, node.InnerText, desc, range);
2301 else if (type == Qsymbol)
2303 Symbol[] range = null;
2304 if (range_list != null)
2306 range = new Symbol[nranges];
2307 for (int i = 0; i < nranges; i++)
2308 range[i] = range_list[i].FirstChild.InnerText;
2310 vari = domain.Defvar (vname, (Symbol) node.InnerText, desc,
2314 throw new Error (Error.TermTypeInvalid, "Unknown type: {0}", type);
2318 if (domain.variables.TryGetValue (vname, out vari))
2319 vari = vari.Clone (domain);
2321 vari = new Variable (domain, vname, Zero);
2322 domain.variables[vname] = vari;
2327 private static Variable[] parse_args (Domain domain, XmlNode node,
2328 out int min_args, out int max_args)
2335 node = node.FirstChild;
2336 if (node != null && node.Name == Qargs)
2339 for (n = node.FirstChild; n != null; n = n.NextSibling)
2341 if (n.Name == Qfixed)
2343 else if (n.Name == Qoptional)
2345 else if (n.Name == Qrest)
2348 throw new Error (Error.WrongType, n, "Too many <rest>");
2352 throw new Error (Error.WrongType, n,
2353 "Not fixed, optional, nor rest: {0}", n.Name);
2356 max_args = nfixed + noptional + nrest;
2357 args = new Variable[max_args];
2358 n = node.FirstChild;
2359 for (int i = 0; i < max_args; n = n.NextSibling)
2360 args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value);
2362 max_args = - max_args;
2366 min_args = max_args = 0;
2367 args = new Variable[0];
2372 private static Symbol parse_defun_head (Domain domain, XmlNode node)
2374 Symbol name = node.Attributes[Qfname].Value;
2375 int min_args, max_args;
2378 args = parse_args (domain, node, out min_args, out max_args);
2379 if (node.Name == Qdefun)
2380 domain.Defun (name, min_args, max_args, args, null);
2382 domain.Defmacro (name, min_args, max_args, args, null);
2386 private static void parse_defun_body (Domain domain, XmlNode node)
2388 bool is_defun = node.Name == Qdefun;
2389 Symbol name = node.Attributes[Qfname].Value;
2390 Function func = domain.GetFunc (name);
2392 for (node = node.FirstChild; node != null; node = node.NextSibling)
2393 if (node.Name != Qdescription && node.Name != Qargs)
2395 Console.WriteLine ("found body " + node.Name);
2397 Term[] body = Parse (domain, node, null);
2399 ((Function.Lambda) func).SetBody (body);
2401 ((Function.Macro) func).SetBody (body);
2404 public static Term Parse (Domain domain, XmlNode node)
2406 Symbol name = node.Name;
2409 if (name == Qinteger)
2410 return new Term (parse_integer (node));
2411 if (name == Qsymbol)
2412 return new Term ((Symbol) node.InnerText);
2413 if (name == Qstring)
2414 return new Term (node.InnerText);
2417 List<Term> list = new List<Term> ();
2418 for (node = node.FirstChild; node != null;
2419 node = node.NextSibling)
2420 list.Add (Parse (domain, node));
2421 return new Term (list);
2423 if (name == Qdefun || name == Qdefmacro)
2425 name = parse_defun_head (domain, node);
2426 parse_defun_body (domain, node);
2427 return new Term (name);
2429 if (name == Qdefvar)
2431 name = parse_defvar (domain, node);
2432 return new Term (name);
2435 if (domain.termtypes.TryGetValue (name, out parser))
2437 object[] arg = new object[] { domain, node };
2438 return new Term ((TermValue) parser.Invoke (null, arg));
2441 Funcall funcall = (Funcall) Funcall.Parser (domain, node);
2442 if (funcall.func is Function.Macro)
2443 return funcall.Eval (domain);
2444 return new Term (funcall);
2449 } catch (Exception e) {
2450 throw new Error (Error.UnknownError, node, e, "Parsing error");
2454 /// <summary>Parse a node and the following siblings as "term"s in a
2455 /// specific domain.</summary>
2456 /// <param name='domain'></param>
2457 /// <param name='start'></param>
2458 /// <param name='stop'></param>
2459 /// <returns>Array of terms.</returns>
2461 public static Term[] Parse (Domain domain, XmlNode start, XmlNode stop)
2464 for (n = start; n != stop && n != null; n = n.NextSibling)
2465 if (n.NodeType == XmlNodeType.Element
2466 && (n.Name == Qdefun || n.Name == Qdefmacro))
2469 parse_defun_head (domain, n);
2474 } catch (Exception e) {
2475 throw new Error (Error.UnknownError, n, e, "Parsing error");
2479 List<Term> terms = new List<Term> ();
2480 for (; start != n; start = start.NextSibling)
2481 if (start.NodeType == XmlNodeType.Element)
2484 if (start.Name == Qdefun || start.Name == Qdefmacro)
2485 parse_defun_body (domain, start);
2486 else if (start.Name == Qdefvar)
2487 parse_defvar (domain, start);
2489 terms.Add (Parse (domain, start));
2494 } catch (Exception e) {
2495 throw new Error (Error.UnknownError, start, e, "Parsing error");
2498 return terms.ToArray ();
2501 public static Term[] Parse (Domain domain, string url)
2503 XmlDocument doc = new XmlDocument (Symbol.NameTable);
2506 using (XmlTextReader reader = new XmlTextReader (url, Symbol.NameTable))
2508 reader.WhitespaceHandling = WhitespaceHandling.None;
2511 } while (reader.NodeType != XmlNodeType.None
2512 && (reader.NodeType != XmlNodeType.Element
2513 || reader.Name != Qexpr));
2514 if (reader.NodeType == XmlNodeType.None)
2515 throw new Exception ("Node <expr> not found");
2516 node = doc.ReadNode (reader);
2518 return Parse (domain, node.FirstChild, null);
2521 /// <summary>Evaluate a term in a specific domain.</summary>
2522 /// <param name='domain'>Domain to evaluate the term in.</param>
2523 /// <param name='term'>The term to evaluate.</param>
2524 /// <returns>The result of evaluating the <paramref
2525 /// name="term"/>.</returns>
2526 public static Term Eval (Domain domain, Term term)
2528 return Eval (domain, new Term[] { term });
2531 /// <summary>Evaluate terms in a specific domain.</summary>
2532 /// <param name='domain'>Domain to evaluate terms in.</param>
2533 /// <param name='terms'>Array of terms to evaluate.</param>
2534 /// <returns>The result of evaluating the last term of <paramref
2535 /// name="terms"/>.</returns>
2536 public static Term Eval (Domain domain, Term[] terms)
2541 foreach (Term term in terms)
2543 result = term.Eval (domain);
2544 if (domain.Thrown ())
2550 } catch (Exception e) {
2551 throw new Error (Error.UnknownError, null, e, "Runtime error");
2557 private static int trace_depth = 0;
2559 /// <value> TraceDepth specifies the minimum depth of call stack
2560 /// to suppress tracing. 0 means no tracing. </value>
2561 public static int TraceDepth {
2562 get { return trace_depth; }
2563 set { trace_depth = value; }