2 using System.Collections;
3 using System.Collections.Generic;
5 using System.Reflection;
7 using System.Text.RegularExpressions;
12 public static class Xexpression
14 private static int trace_depth = 0;
16 public static int TraceDepth {
17 get { return trace_depth; }
18 set { trace_depth = value; }
21 public class Error : Exception
23 private readonly Symbol name;
27 public Error (Symbol name, XmlNode node,
28 string fmt, params object[] args)
29 : base (String.Format (fmt, args))
35 public Error (Symbol name, XmlNode node, Exception e,
36 string fmt, params object[] args)
37 : base (String.Format (fmt, args), e)
43 public Error (Symbol name, string fmt, params object[] args)
44 : base (String.Format (fmt, args))
49 public Symbol Name { get { return name; } }
52 internal set { node = value; }
56 internal set { stack = value; }
59 public override string ToString ()
61 string str = (InnerException != null ? InnerException.ToString ()
62 : base.ToString ()) + "\n" + "Xexpression:" + name + "\n";
64 str += " at " + node.Parent.OuterXml + "\n";
67 str += "Call stack: ";
68 foreach (Term term in stack)
69 str += term.ToString (false);
75 // System.OutOfMemoryException or System.InsufficientMemoryException
76 public static Symbol MemoryError = "memory-error";
78 public static Symbol UnknownError = "unknown-error";
79 public static Symbol WrongArgument = "wrong-argument";
82 public static Symbol InvalidInteger = "invalid-integer";
83 public static Symbol TermTypeInvalid = "term-type-invalid";
84 public static Symbol FunctionConflict = "function-conflict";
85 public static Symbol VariableTypeConflict = "variable-type-conflict";
86 public static Symbol VariableRangeConflict = "variable-range-conflict";
87 public static Symbol VariableWrongRange = "variable-wrong-range";
88 public static Symbol VariableWrongValue = "variable-wrong-value";
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 bool IsSubrange (int[] r)
259 for (int i = 0; i < r.Length; i += 2)
262 for (j = 0; j < range.Length; j += 2)
263 if (range[j] <= r[i] && range[j + 1] >= r[i + 1])
265 if (j >= range.Length)
271 public IntType (Domain domain, Symbol name, int n, string desc,
273 : base (domain, name, new Term (n), desc)
275 if (range != null && range.Length % 2 == 1)
276 throw new Error (Error.VariableWrongRange,
277 "Range length for {0} not even", name);
282 public override bool CheckValue (Term term)
289 for (int i = 0; i < range.Length; i += 2)
290 if (range[i] <= n && range[i + 1] >= n)
296 public override Variable Clone (Domain domain)
298 return new IntType (domain, name, val.Intval, desc, range);
301 public int[] Range { get { return range; } set { range = value; } }
304 public class StrType : Typed
306 private string[] range;
308 public bool IsSubrange (string[] r)
312 for (int i = 0; i < r.Length; i++)
315 for (j = 0; j < range.Length; j++)
316 if (range[j] == r[i])
318 if (j >= range.Length)
324 public StrType (Domain domain, Symbol name, Str str, string desc,
326 : base (domain, name, new Term (str), desc)
332 public override bool CheckValue (Term val)
338 Str str = val.Strval;
339 foreach (string s in range)
346 public override Variable Clone (Domain domain)
348 return new StrType (domain, name, val.Strval, desc, range);
351 public string[] Range { get { return range; } set { range = value; } }
354 public class SymType : Typed
356 public Symbol[] range;
358 public bool IsSubrange (Symbol[] r)
362 for (int i = 0; i < r.Length; i++)
365 for (j = 0; j < range.Length; j++)
366 if (range[j] == r[i])
368 if (j >= range.Length)
374 public SymType (Domain domain, Symbol name, Symbol sym, string desc,
376 : base (domain, name, new Term (sym), desc)
382 public override bool CheckValue (Term val)
388 Symbol sym = val.Symval;
389 foreach (Symbol n in range)
396 public override Variable Clone (Domain domain)
398 return new SymType (domain, name, val.Symval, desc, range);
401 public Symbol[] Range { get { return range; } set { range = value; } }
405 public abstract class Function
408 // True iff the function can be called with vname="VNAME" attribute.
409 internal readonly bool with_var;
410 // Minimum number of positional arguments.
411 internal readonly int min_args;
412 // If non-nengative, maximum number of arguments. If negative,
413 // maxinum number of positional arguments is (-1 - max_args),
414 // and the remaining unlimit number of arguments are given as a
416 internal readonly int max_args;
418 public delegate Term Builtin (Domain domain, Variable vari, Term[] terms);
420 public Function () { }
422 public Function (Symbol name, bool with_var, int min_args, int max_args)
425 this.with_var = with_var;
426 this.min_args = min_args;
427 this.max_args = max_args;
430 public abstract Term Call (Domain domain, Variable vari, Term[] args);
432 public override string ToString ()
437 internal class Subroutine : Function
439 public Builtin builtin;
441 public Subroutine (Builtin builtin, Symbol name, bool with_var,
442 int min_args, int max_args)
443 : base (name, with_var, min_args, max_args)
445 this.builtin = builtin;
448 public override Term Call (Domain domain, Variable vari, Term[] args)
452 args = (Term[]) args.Clone ();
453 for (int i = 0; i < args.Length; i++)
455 args[i] = args[i].Eval (domain);
456 if (domain.Thrown ())
460 return builtin (domain, vari, args);
464 internal class SpecialForm : Function
466 public Builtin builtin;
468 public SpecialForm (Builtin builtin, Symbol name, bool with_var,
469 int min_args, int max_args)
470 : base (name, with_var, min_args, max_args)
472 this.builtin = builtin;
475 public override Term Call (Domain domain, Variable vari, Term[] args)
477 return builtin (domain, vari, args);
481 internal class Lambda : Function
483 private Variable[] args;
486 public Lambda (Symbol name, int min_args, int max_args, Variable[] args,
488 : base (name, false, min_args, max_args)
494 public void SetBody (Term[] body)
499 public override Term Call (Domain domain, Variable vari, Term[] args)
501 Bindings current = domain.bindings;
503 int limit = max_args >= 0 ? args.Length : args.Length - 1;
506 for (int i = 0; i < limit; i++)
508 result = args[i].Eval (domain);
509 if (domain.Thrown ())
511 domain.Bind (this.args[i], result);
515 List<Term> list = new List<Term> ();
516 list.InsertRange (0, args[limit].Listval);
518 for (int i = 0; i < list.Count; i++)
520 result = list[i].Eval (domain);
521 if (domain.Thrown ())
525 domain.Bind (this.args[limit], new Term (list));
528 domain.Catch (CatchTag.Return);
529 foreach (Term term in body)
531 result = term.Eval (domain);
532 if (domain.Thrown ())
539 domain.UnboundTo (current);
545 internal class Macro : Function
547 private Variable[] args;
550 public Macro (Symbol name, int min_args, int max_args, Variable[] args,
552 : base (name, false, min_args, max_args)
558 public void SetBody (Term[] body)
563 public override Term Call (Domain domain, Variable vari, Term[] args)
565 Bindings current = domain.bindings;
569 for (int i = 0; i < args.Length; i++)
570 domain.Bind (this.args[i], args[i]);
572 domain.Catch (CatchTag.Return);
573 foreach (Term term in body)
575 result = term.Eval (domain);
576 if (domain.Thrown ())
583 domain.UnboundTo (current);
590 internal class Bindings
592 private Variable vari;
593 private Term old_value;
594 private Bindings next;
596 private Bindings (Variable vari)
599 old_value = vari.Value;
602 public static Bindings Bind (Bindings bindings, Variable vari, Term val)
604 Bindings b = new Bindings (vari);
606 b.vari.SetValue (val);
611 internal Bindings UnboundTo (Bindings boundary)
613 for (Bindings b = this; b != boundary; b = b.next)
614 b.vari.SetValue (b.old_value);
618 public override string ToString ()
620 string str = "(bindings";
621 for (Bindings b = this; b != null; b = b.next)
622 str += " " + vari.name + "=" + b.old_value;
627 internal struct CatchTag
630 public Term Tag { get { return tag; } }
632 // Normal symbolic catch-tag.
633 public CatchTag (Symbol sym) { tag = new Term (sym); }
634 // Special catch-tag for return and break.
635 private CatchTag (int i) { tag = new Term (i); }
637 public static CatchTag Return = new CatchTag (0);
638 public static CatchTag Break = new CatchTag (1);
644 public object context;
645 public int depth = 0;
646 private Stack<Term> call_stack = new Stack<Term> ();
648 internal Dictionary<Symbol, MethodInfo> termtypes
649 = new Dictionary<Symbol, MethodInfo> ();
650 internal Dictionary<Symbol, Function> functions
651 = new Dictionary<Symbol, Function> ();
652 internal Dictionary<Symbol, Variable> variables
653 = new Dictionary<Symbol, Variable> ();
654 internal Bindings bindings;
655 private Stack<CatchTag> catch_stack = new Stack<CatchTag> ();
656 private int catch_count = 0;
658 internal Domain (Symbol name) { this.name = name; }
660 public Domain (Symbol name, object context)
661 : this (name, basic, context) { }
663 public Domain (Symbol name, Domain parent, object context) : this (name)
665 termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
666 functions = new Dictionary<Symbol, Function> (parent.functions);
667 variables = new Dictionary<Symbol, Variable> (parent.variables);
668 this.context = context;
671 public int CallStackCount { get { return call_stack.Count; } }
673 public void CallStackPush (Term term) { call_stack.Push (term); }
675 public void CallStackPop () { call_stack.Pop (); }
677 public void CallStackPop (int count)
679 while (count < call_stack.Count)
683 public Term[] CallStack { get { return call_stack.ToArray (); } }
685 internal void Bind (Variable vari, Term value)
687 bindings = Bindings.Bind (bindings, vari, value);
690 internal void UnboundTo (Bindings boundary)
692 if (bindings != null)
693 bindings = bindings.UnboundTo (boundary);
696 internal void Catch (CatchTag tag)
698 catch_stack.Push (tag);
702 internal void Uncatch ()
705 if (catch_count > catch_stack.Count)
709 public bool Thrown () { return catch_count < catch_stack.Count; }
711 public bool Thrown (out bool caught)
713 if (catch_count < catch_stack.Count)
715 caught = catch_count == catch_stack.Count - 1;
722 internal void ThrowReturn ()
724 foreach (CatchTag elt in catch_stack)
727 if (elt.Tag == CatchTag.Return.Tag)
732 internal void ThrowBreak ()
734 if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
735 throw new Error (Error.NoLoopToBreak,
736 "No surrounding loop to break");
740 internal void ThrowSymbol (Term tag)
742 foreach (CatchTag elt in catch_stack)
745 if (elt.Tag.Matches (tag))
748 throw new Error (Error.UncaughtThrow,
749 "No corresponding catch: {0}", tag);
752 public void DefType (Type type)
754 if (! type.IsSubclassOf (typeof (TermValue)))
755 throw new Error (Error.TermTypeInvalid,
756 "Not a subclass of TermValue: {0}", type);
757 BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
758 FieldInfo finfo = type.GetField ("name", flags);
759 if (finfo == null || finfo.FieldType != typeof (Symbol))
760 throw new Error (Error.TermTypeInvalid,
761 "No \"name\" field of string type: {0}", type);
762 Symbol name = (Symbol) finfo.GetValue (null);
763 if (termtypes.ContainsKey (name))
764 throw new Error (Error.TermTypeInvalid,
765 "Already defined: {0}", name);
766 if (functions.ContainsKey (name))
767 throw new Error (Error.TermTypeInvalid,
768 "Already defined as a function or a macro: {0}",
770 Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
771 MethodInfo parser = type.GetMethod ("Parser", types);
772 if (parser == null || parser.ReturnType != typeof (TermValue))
773 throw new Error (Error.TermTypeInvalid,
774 "No \"Parser\" method of correct type: {0}", type);
775 termtypes[name] = parser;
778 private void check_func_head (Symbol name, bool with_var,
779 int min_args, int max_args, bool as_macro)
781 if (termtypes.ContainsKey (name))
782 throw new Error (Error.FunctionConflict,
783 "Already defined as a term type: {0}", name);
785 if (functions.TryGetValue (name, out func))
787 if ((func is Function.Macro) != as_macro)
788 throw new Error (Error.FunctionConflict,
789 "Already defined as a {0}: {1}",
790 as_macro ? "function" : "macro", name);
791 if (func.with_var != with_var
792 || func.min_args != min_args
793 || func.max_args != max_args)
794 throw new Error (Error.FunctionConflict,
795 "Conflicting arguments: {0}", name);
799 public void DefSubr (Function.Builtin builtin, Symbol name,
800 bool with_var, int min_args, int max_args)
802 check_func_head (name, with_var, min_args, max_args, false);
803 functions[name] = new Function.Subroutine (builtin, name, with_var,
807 public void DefSpecial (Function.Builtin builtin, Symbol name,
808 bool with_var, 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.IntType intvari = vari as Variable.IntType;
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.IntType (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.StrType strvari = vari as Variable.StrType;
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.StrType (this, name, new Str (str), desc,
917 variables[name] = vari;
922 public Variable DefvarSym (Symbol name, Symbol sym, string desc,
927 if (variables.TryGetValue (name, out vari))
929 Variable.SymType symvari = vari as Variable.SymType;
931 throw new Error (Error.VariableTypeConflict,
932 "Not a symbol variable: {0}", name);
935 if (! symvari.IsSubrange (range))
936 throw new Error (Error.VariableRangeConflict,
937 "Conflicting variable range: {0}", name);
938 symvari.Range = range;
941 symvari.Description = desc;
945 vari = new Variable.SymType (this, name, sym, desc, range);
946 variables[name] = vari;
951 internal Function GetFunc (Symbol name)
954 if (! functions.TryGetValue (name, out func))
955 throw new Error (Error.UnknownFunction,
956 "Unknown function: {0}", name);
960 public bool CopyFunc (Domain domain, Symbol name)
962 Function func = GetFunc (name);
964 domain.functions[name] = func;
968 public void CopyFunc (Domain domain)
970 foreach (KeyValuePair<Symbol, Function> kv in functions)
971 domain.functions[kv.Key] = kv.Value;
974 public Variable GetVar (Symbol name)
978 if (! variables.TryGetValue (name, out vari))
979 variables[name] = vari = new Variable (this, name, Zero);
983 public override string ToString ()
985 string str = "<(functions";
986 foreach (KeyValuePair<Symbol, Function> kv in functions)
988 str += ") (variabls";
989 foreach (KeyValuePair<Symbol, Variable> kv in variables)
990 str += " " + kv.Value;
992 if (bindings != null)
993 str += " " + bindings;
995 str += " (" + context + ")";
1000 internal void TraceWrite (string fmt, params string[] arg)
1002 if (trace_depth > depth)
1004 for (int i = 0; i < depth; i++)
1005 Console.Write (" ");
1006 Console.WriteLine (fmt, arg);
1010 public object SaveValues ()
1012 Dictionary<Variable,Term> values = new Dictionary<Variable,Term> ();
1014 foreach (KeyValuePair<Symbol,Variable> kv in variables)
1015 values[kv.Value] = kv.Value.Value.Clone ();
1019 public void RestoreValues (object values)
1021 foreach (KeyValuePair<Variable,Term> kv
1022 in (Dictionary<Variable,Term>) values)
1023 kv.Key.SetValue (kv.Value);
1027 private static Domain basic = new Domain ("basic");
1029 static Xexpression ()
1031 basic.DefType (typeof (Varref));
1032 basic.DefType (typeof (Funcall));
1033 basic.DefType (typeof (ErrorTerm));
1035 basic.DefSubr (Fset, "set", true, 1, 1);
1036 basic.DefAlias ("=", "set");
1037 basic.DefSubr (Fnot, "not", false, 1, 1);
1038 basic.DefAlias ("!", "not");
1039 basic.DefSubr (Fadd, "add", true, 1, -1);
1040 basic.DefAlias ("+", "add");
1041 basic.DefSubr (Fmul, "mul", true, 1, -1);
1042 basic.DefAlias ("*", "mul");
1043 basic.DefSubr (Fsub, "sub", true, 1, -1);
1044 basic.DefAlias ("-", "sub");
1045 basic.DefSubr (Fdiv, "div", true, 1, -1);
1046 basic.DefAlias ("/", "div");
1047 basic.DefSubr (Fmod, "mod", true, 1, 2);
1048 basic.DefAlias ("%", "mod");
1049 basic.DefSubr (Flogior, "logior", true, 1, -1);
1050 basic.DefAlias ("|", "logior");
1051 basic.DefSubr (Flogand, "logand", true, 1, -1);
1052 basic.DefAlias ("&", "logand");
1053 basic.DefSubr (Flsh, "lsh", true, 1, 2);
1054 basic.DefAlias ("<<", "lsh");
1055 basic.DefSubr (Frsh, "rsh", true, 1, 2);
1056 basic.DefAlias (">>", "rsh");
1057 basic.DefSubr (Feq, "eq", false, 2, -1);
1058 basic.DefAlias ("==", "eq");
1059 basic.DefSubr (Fnoteq, "noteq", false, 2, 2);
1060 basic.DefAlias ("!=", "noteq");
1061 basic.DefSubr (Flt, "lt", false, 2, -1);
1062 basic.DefAlias ("<", "lt");
1063 basic.DefSubr (Fle, "le", false, 2, -1);
1064 basic.DefAlias ("<=", "le");
1065 basic.DefSubr (Fgt, "gt", false, 2, -1);
1066 basic.DefAlias (">", "gt");
1067 basic.DefSubr (Fge, "ge", false, 2, -1);
1068 basic.DefAlias (">=", "ge");
1070 basic.DefSubr (Fappend, "append", true, 0, -1);
1071 basic.DefSubr (Fconcat, "concat", true, 0, -1);
1072 basic.DefSubr (Fnth, "nth", false, 2, 2);
1073 basic.DefSubr (Fcopy, "copy", false, 1, 1);
1074 basic.DefSubr (Fins, "ins", true, 2, 2);
1075 basic.DefSubr (Fdel, "del", true, 2, 2);
1076 basic.DefSubr (Feval, "eval", false, 1, 1);
1077 basic.DefSubr (Fbreak, "break", false, 0, 1);
1078 basic.DefSubr (Freturn, "return", false, 0, 1);
1079 basic.DefSubr (Fthrow, "throw", false, 1, 2);
1081 basic.DefSpecial (Fand, "and", false, 1, -1);
1082 basic.DefAlias ("&&", "and");
1083 basic.DefSpecial (For, "or", false, 1, -1);
1084 basic.DefAlias ("||", "or");
1085 basic.DefSpecial (Fprogn, "progn", false, 0, -1);
1086 basic.DefAlias ("expr", "progn");
1087 basic.DefSpecial (Fif, "if", false, 2, 3);
1088 basic.DefSpecial (Fwhen, "when", false, 1, -1);
1089 basic.DefSpecial (Floop, "loop", false, 1, -1);
1090 basic.DefSpecial (Fwhile, "while", false, 1, -1);
1091 basic.DefSpecial (Fcond, "cond", false, 1, -1);
1092 basic.DefSpecial (Fforeach, "foreach", true, 2, -1);
1093 basic.DefSpecial (Fquote, "quote", false, 1, 1);
1094 basic.DefSpecial (Ftype, "type", false, 1, 1);
1095 basic.DefSpecial (Fcatch, "catch", true, 2, -1);
1098 private static Term Fset (Domain domain, Variable vari, Term[] args)
1101 throw new Error (Error.NoVariableName, "No variable name to set");
1102 vari.SetValue (args[0]);
1106 private static Term Fnot (Domain domain, Variable vari, Term[] args)
1108 return args[0].IsTrue ? Zero : One;
1111 static Term maybe_set_intvar (Variable vari, int n)
1113 Term term = new Term (n);
1115 vari.SetValue (term);
1120 private static Term Fadd (Domain domain, Variable vari, Term[] args)
1122 int n = vari == null ? 0 : vari.Value.Intval;
1124 foreach (Term arg in args)
1126 return maybe_set_intvar (vari, n);
1129 private static Term Fmul (Domain domain, Variable vari, Term[] args)
1131 int n = vari == null ? 1 : vari.Value.Intval;
1132 foreach (Term arg in args)
1134 return maybe_set_intvar (vari, n);
1137 private static Term Fsub (Domain domain, Variable vari, Term[] args)
1148 n = vari.Value.Intval;
1151 while (i < args.Length)
1152 n -= args[i++].Intval;
1153 return maybe_set_intvar (vari, n);
1156 private static Term Fdiv (Domain domain, Variable vari, Term[] args)
1167 n = vari.Value.Intval;
1170 while (i < args.Length)
1171 n /= args[i++].Intval;
1172 return maybe_set_intvar (vari, n);
1175 private static Term Fmod (Domain domain, Variable vari, Term[] args)
1177 return maybe_set_intvar (vari, args[0].Intval % args[1].Intval);
1180 private static Term Flogior (Domain domain, Variable vari, Term[] args)
1182 int n = vari == null ? 0 : vari.Value.Intval;
1183 foreach (Term arg in args)
1185 return maybe_set_intvar (vari, n);
1188 private static Term Flogand (Domain domain, Variable vari, Term[] args)
1199 n = vari.Value.Intval;
1202 while (i < args.Length)
1203 n &= args[i++].Intval;
1204 return maybe_set_intvar (vari, n);
1207 private static Term Flsh (Domain domain, Variable vari, Term[] args)
1209 return maybe_set_intvar (vari, args[0].Intval << args[1].Intval);
1212 private static Term Frsh (Domain domain, Variable vari, Term[] args)
1214 return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval);
1217 private static Term Feq (Domain domain, Variable vari, Term[] args)
1221 if (o.objval == null)
1223 for (int i = 1; i < args.Length; i++)
1224 if (args[i].objval != null || args[i].intval != o.intval)
1229 for (int i = 1; i < args.Length; i++)
1230 if (o.objval.Equals (args[i].objval))
1236 private static Term Fnoteq (Domain domain, Variable vari, Term[] args)
1238 return Feq (domain, vari, args);
1241 private static Term Flt (Domain domain, Variable vari, Term[] args)
1243 int n = args[0].Intval;
1245 for (int i = 1; i < args.Length; i++)
1247 int n1 = args[i].Intval;
1255 private static Term Fle (Domain domain, Variable vari, Term[] args)
1257 int n = args[0].Intval;
1258 for (int i = 1; i < args.Length; i++)
1260 int n1 = args[i].Intval;
1268 private static Term Fgt (Domain domain, Variable vari, Term[] args)
1270 int n = args[0].Intval;
1271 for (int i = 1; i < args.Length; i++)
1273 int n1 = args[i].Intval;
1281 private static Term Fge (Domain domain, Variable vari, Term[] args)
1283 int n = args[0].Intval;
1284 for (int i = 1; i < args.Length; i++)
1286 int n1 = args[i].Intval;
1294 private static Term Fappend (Domain domain, Variable vari, Term[] args)
1299 list = new List<Term> ();
1301 list = vari.Value.Listval;
1303 foreach (Term arg in args)
1306 list.AddRange ((List<Term>) arg.objval);
1314 result.objval = list;
1320 private static Term Fconcat (Domain domain, Variable vari, Term[] args)
1322 Str str = vari == null ? new Str ("") : vari.Value.Strval;
1324 foreach (Term arg in args)
1327 str.Insert (-1, arg.Strval);
1328 else if (arg.IsList)
1329 foreach (Term term in arg.Listval)
1330 str.Insert (-1, (char) term.Intval);
1332 str.Insert (-1, (char) arg.Intval);
1334 return vari == null ? new Term (str) : vari.Value;
1337 private static Term Fnth (Domain domain, Variable vari, Term[] args)
1340 return new Term (args[1].Strval.Nth (args[0].Intval));
1342 return args[1].Listval[args[0].Intval];
1343 throw new Error (Error.WrongType,
1344 "Not a string nor a list: {0}", args[1]);
1347 private static Term Fcopy (Domain domain, Variable vari, Term[] args)
1349 return args[0].Clone ();
1352 private static Term Fins (Domain domain, Variable vari, Term[] args)
1355 throw new Error (Error.NoVariableName, "No variable name to set");
1356 if (vari.Value.IsStr)
1357 vari.Value.Strval.Insert (args[0].Intval, args[1].Strval);
1358 else if (vari.Value.IsList)
1359 vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval);
1361 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1366 private static Term Fdel (Domain domain, Variable vari, Term[] args)
1369 throw new Error (Error.NoVariableName, "No variable name to set");
1370 if (vari.Value.IsStr)
1371 vari.Value.Strval.Delete (args[0].Intval, args[1].Intval);
1372 else if (vari.Value.IsList)
1373 vari.Value.Listval.RemoveRange (args[0].Intval,
1374 args[1].Intval - args[0].Intval);
1376 throw new Error (Error.WrongType, "Not a string nor a list: {0}",
1381 private static Term Fand (Domain domain, Variable vari, Term[] args)
1383 foreach (Term arg in args)
1384 if (! arg.Eval (domain).IsTrue)
1389 private static Term For (Domain domain, Variable vari, Term[] args)
1391 foreach (Term arg in args)
1392 if (arg.Eval (domain).IsTrue)
1397 private static Term Feval (Domain domain, Variable vari, Term[] args)
1399 return (args[0].Eval (domain));
1402 private static Term Fprogn (Domain domain, Variable vari, Term[] args)
1406 foreach (Term arg in args)
1407 result = arg.Eval (domain);
1411 private static Term Fif (Domain domain, Variable vari, Term[] args)
1413 if (args[0].Eval (domain).IsTrue)
1414 return args[1].Eval (domain);
1415 if (args.Length == 2)
1417 return args[2].Eval (domain);
1420 private static Term Fwhen (Domain domain, Variable vari, Term[] args)
1422 if (! args[0].Eval (domain).IsTrue)
1425 for (int i = 1; i < args.Length; i++)
1426 result = args[i].Eval (domain);
1430 private static Term Freturn (Domain domain, Variable vari, Term[] args)
1432 domain.ThrowReturn ();
1433 return args.Length == 0 ? Zero : args[0];
1436 private static Term Fbreak (Domain domain, Variable vari, Term[] args)
1438 domain.ThrowBreak ();
1439 return args.Length == 0 ? Zero : args[0];
1442 private static Term Floop (Domain domain, Variable vari, Term[] args)
1446 domain.Catch (CatchTag.Break);
1447 while (! domain.Thrown ())
1448 foreach (Term arg in args)
1450 result = arg.Eval (domain);
1451 if (domain.Thrown ())
1460 private static Term Fwhile (Domain domain, Variable vari, Term[] args)
1464 domain.Catch (CatchTag.Break);
1465 while (! domain.Thrown () && args[0].Eval (domain).IsTrue)
1466 for (int i = 1; i < args.Length; i++)
1468 result = args[i].Eval (domain);
1469 if (domain.Thrown ())
1478 private static Term Fcond (Domain domain, Variable vari, Term[] args)
1480 foreach (Term arg in args)
1482 List<Term> list = arg.Listval;
1483 Term result = list[0].Eval (domain);
1487 for (int i = 1; i < list.Count; i++)
1490 result = list[i].Eval (domain);
1492 if (domain.Thrown ())
1501 private static Term Fforeach (Domain domain, Variable vari, Term[] args)
1503 Term result = args[0].Eval (domain);
1504 if (domain.Thrown ())
1506 List<Term> list = result.Listval;
1507 Bindings current = domain.bindings;
1510 domain.Catch (CatchTag.Break);
1511 foreach (Term term in list)
1513 domain.Bind (vari, term);
1515 for (int i = 1; i < args.Length; i++)
1517 result = args[i].Eval (domain);
1518 if (domain.Thrown ())
1522 domain.UnboundTo (current);
1531 private static Term Fquote (Domain domain, Variable vari, Term[] args)
1536 private static Term Ftype (Domain domain, Variable vari, Term[] args)
1542 if (args[0].IsSymbol)
1549 private static Term eval_terms (Domain domain, Term[] terms, int idx,
1555 for (int i = idx; i < terms.Length; i++)
1557 result = terms[i].Eval (domain);
1558 if (domain.Thrown (out caught))
1564 public static Term Fcatch (Domain domain, Variable vari, Term[] args)
1567 bool caught = false;
1569 if (args.Length < 2)
1570 throw new Error (Error.WrongArgument,
1571 "Too few arguments: {0}", args.Length);
1572 ErrorTerm err = args[0].objval as ErrorTerm;
1576 result = eval_terms (domain, args, 1, out caught);
1577 } catch (System.Exception exception) {
1580 Error e = exception as Error;
1582 term = new Term (new ErrorTerm (e.Name, e.Message, e.Stack));
1584 term = new Term (new ErrorTerm (exception));
1585 if (! args[0].Matches (term))
1588 vari.SetValue (term);
1592 else if (args[0].IsSymbol)
1595 domain.Catch (new CatchTag (args[0].Symval));
1596 result = eval_terms (domain, args, 1, out caught);
1600 vari.SetValue (result);
1608 throw new Error (Error.WrongArgument,
1609 "Not a symbol nor an error: {0}", args[0]);
1612 public static Term Fthrow (Domain domain, Variable vari, Term[] args)
1614 if (args[0].IsSymbol)
1616 domain.ThrowSymbol (args[0]);
1617 return (args[args.Length - 1]);
1619 if (args[0].IsError)
1621 ErrorTerm err = (ErrorTerm) args[0].objval;
1622 throw new Error (err.ErrorName, err.ErrorMessage);
1624 throw new Error (Error.WrongArgument,
1625 "Not a symbol nor an error: {0}", args[0]);
1628 public abstract class TermValue
1630 public virtual Term Eval (Domain domain) { return new Term (this); }
1631 public virtual TermValue Clone () { return this; }
1632 public virtual bool IsTrue { get { return true; } }
1633 public virtual bool Matches (TermValue other) { return Equals (other); }
1634 public override abstract bool Equals (object obj);
1635 public override abstract int GetHashCode ();
1636 public abstract string ToString (bool detail);
1639 private class Varref : TermValue
1641 private static Symbol name = "varref";
1642 public static Symbol Name { get { return name; } }
1644 private Symbol vname;
1645 private Variable vari;
1647 public Varref (Symbol vname) { this.vname = vname; }
1649 public override Term Eval (Domain domain)
1651 if (vari == null || vari.domain != domain)
1652 vari = domain.GetVar (vname);
1656 public static TermValue Parser (Domain domain, XmlNode node)
1658 return new Varref ((Symbol) node.Attributes[Qvname].Value);
1661 public override bool Equals (object obj)
1663 Varref varref = obj as Varref;
1664 return (varref != null && varref.vari.name == vari.name);
1667 public override int GetHashCode ()
1669 return vari.name.GetHashCode ();
1672 public override string ToString () { return ToString (true); }
1674 public override string ToString (bool detail)
1676 return "<varref vname=\"" + vname + "\"/>";
1680 private class Funcall : TermValue
1682 private static Symbol name = "funcall";
1683 public static Symbol Name { get { return name; } }
1685 internal Function func;
1686 internal Variable vari;
1687 internal Term[] args;
1689 public Funcall (Function func, Variable vari, Term[] args)
1691 int nargs = args.Length;
1693 if (nargs < func.min_args
1694 || (func.max_args >= 0 && nargs > func.max_args))
1695 throw new Error (Error.WrongArgument,
1696 "Wrong number of arguments to {0}: {1}",
1698 if (! func.with_var && vari != null)
1699 throw new Error (Error.WrongArgument,
1700 "Wrong vname attribute to {0}: {1}",
1701 func.name, vari.name);
1707 public static TermValue Parser (Domain domain, XmlNode node)
1709 Symbol fname = node.Name;
1712 if (fname == Qfuncall)
1713 fname = node.Attributes[Qfname].Value;
1714 Function func = domain.GetFunc (fname);
1716 attr = node.Attributes[Qvname];
1717 vari = attr == null ? null : domain.GetVar (attr.Value);
1718 XmlNodeList nlist = node.ChildNodes;
1719 int nargs = nlist.Count;
1720 Term[] args = new Term[nargs];
1721 for (int i = 0; i < nargs; i++)
1722 args[i] = Parse (domain, nlist[i]);
1723 return new Funcall (func, vari, args);
1726 public override Term Eval (Domain domain)
1729 domain.TraceWrite (ToString ());
1732 result = func.Call (domain, vari, args);
1736 domain.TraceWrite ("=> {0}", result.ToString ());
1740 public override TermValue Clone ()
1742 return new Funcall (func, vari, args);
1745 public override bool Equals (object obj)
1747 Funcall funcall = obj as Funcall;
1749 && funcall.func == func
1750 && funcall.vari == vari
1751 && funcall.args.Length == args.Length);
1754 public override int GetHashCode ()
1756 return func.GetHashCode () ^ args.Length;
1759 public override string ToString () { return ToString (true); }
1761 public override string ToString (bool detail)
1763 string str = "<" + func.name;
1766 str += " vname=\"" + vari.name + "\"";
1768 str += " val=" + vari.Value.ToString ();
1770 if (args.Length == 0 || ! detail)
1773 if (func is Function.SpecialForm)
1775 for (int i = 0; i < args.Length; i++)
1779 foreach (Term e in args)
1781 return (str + "</" + func.name + ">");
1785 internal class ErrorTerm : TermValue
1787 private static Symbol name = "error";
1788 public static Symbol Name { get { return name; } }
1790 private readonly Symbol ename;
1791 public Symbol ErrorName { get { return ename; } }
1792 private string message;
1793 public string ErrorMessage { get { return message; } }
1794 private Term[] stack;
1796 public ErrorTerm (Symbol ename, string message)
1797 : this (ename, message, null) { }
1799 internal ErrorTerm (Symbol ename, string message, Term[] stack)
1802 this.message = message;
1806 internal ErrorTerm (Exception e)
1808 if (e is ArithmeticException)
1809 ename = Error.ArithmeticError;
1810 else if (e is IndexOutOfRangeException)
1811 ename = Error.IndexOutOfRange;
1812 else if (e is InsufficientMemoryException
1813 || e is OutOfMemoryException)
1814 ename = Error.MemoryError;
1816 ename = Error.UnknownError;
1817 message = e.Message;
1820 public static TermValue Parser (Domain domain, XmlNode node)
1822 XmlAttribute attr = node.Attributes[Qename];
1823 Symbol ename = attr == null ? Qnull : (Symbol) attr.Value;
1824 string message = node.InnerText;
1825 return new ErrorTerm (ename, message);
1828 public Term[] CallStack {
1829 get { return stack; }
1830 internal set { stack = value; }
1833 public override TermValue Clone ()
1835 return new ErrorTerm (ename, message);
1838 public override bool Equals (object obj)
1840 ErrorTerm e = obj as ErrorTerm;
1841 return (e != null && e.ename == ename && e.message == message
1842 && (e.stack == null ? stack == null
1843 : (stack != null && e.stack.Length == stack.Length)));
1846 public override int GetHashCode ()
1848 return ename.GetHashCode ();
1851 public override bool Matches (TermValue term)
1853 ErrorTerm e = term as ErrorTerm;
1854 return (e != null && (ename == Qnull || e.ename == ename));
1857 public override string ToString () { return ToString (true); }
1859 public override string ToString (bool detail)
1861 string str = "<error type=\"" + ename + "\">";
1862 if (message != null)
1865 for (int i = 0; i < stack.Length; i++)
1866 str += stack[i].ToString (false);
1867 return str + "</error>";
1874 private Regex regex;
1876 public Str (string str) { this.str = str; }
1878 public Str Clone (Str str) { return new Str (str.str); }
1880 public bool Equals (string str) { return this.str == str; }
1882 public bool Equals (Str str) { return this.str == str.str; }
1884 public bool Matches (Str str)
1887 regex = new Regex (this.str);
1888 return regex.IsMatch (str.str);
1891 public int Nth (int index) { return (int) str[index]; }
1893 public void Insert (int index, Str str)
1896 this.str = this.str + str.str;
1898 this.str = this.str.Insert (index, str.str);
1902 public void Insert (int index, char c)
1905 this.str = this.str + c;
1907 this.str = this.str.Insert (index, new string (c, 1));
1911 public void Delete (int from, int to)
1913 this.str = this.str.Remove (from, to - from);
1917 public override string ToString () { return str; }
1923 public object objval;
1925 // <integer>...</integer>
1926 public Term (int i) { intval = i; objval = null; }
1927 // <symbol>...</symbol>
1928 public Term (Symbol name) { intval = 0; objval = name; }
1929 // <string>...</string>
1930 public Term (string str) { intval = 0; objval = new Str (str); }
1932 public Term (List<Term> list) { intval = 0; objval = list; }
1933 // <error ename="ERROR-NAME">ERROR-MESSASGE</error>
1934 public Term (Symbol name, string message)
1937 objval = new ErrorTerm (name, message);
1940 public Term (Str str) { intval = 0; objval = str; }
1941 public Term (TermValue obj) { intval = 0; objval = obj; }
1943 // <varref vname="VNAME"/>
1944 public Term (Domain domain, Symbol vname)
1947 objval = new Varref (vname);
1950 // <funcall fname="FNAME">...</funcall>
1951 public Term (Domain domain, Symbol fname, Term[] args)
1952 : this (domain, fname, Qnull, args) { }
1954 // <funcall fname="FNAME" vname="VNAME">...</funcall>
1955 public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
1959 Function func = domain.GetFunc (fname);
1960 Variable vari = vname == Qnull ? null : domain.GetVar (vname);
1961 Funcall funcall = new Funcall (func, vari, args);
1962 if (func is Function.Macro)
1964 Term result = funcall.Eval (domain);
1965 intval = result.intval;
1966 objval = result.objval;
1972 public object Objval {
1975 throw new Error (Error.WrongType,
1976 "term is an integer: {0}", this);
1984 throw new Error (Error.WrongType, "{0} is not an integer", this);
1992 throw new Error (Error.WrongType, "{0} is not a string", this);
1993 return (Str) objval;
1997 public string Symval {
2000 throw new Error (Error.WrongType, "{0} is not a symbol", this);
2001 return (Symbol) objval;
2005 public List<Term> Listval {
2008 throw new Error (Error.WrongType, "{0} is not a list");
2009 return (List<Term>) objval;
2013 public bool IsTrue {
2015 return (objval == null
2017 : objval is List<Term>
2018 ? (((List<Term>) objval).Count != 0)
2019 : objval is TermValue
2020 ? ((TermValue) objval).IsTrue
2025 public bool IsInt { get { return (objval == null); } }
2026 public bool IsStr { get { return (objval is Str); } }
2027 public bool IsSymbol { get { return (objval is Symbol); } }
2028 public bool IsList { get { return (objval is List<Term>); } }
2029 public bool IsError { get { return (objval is ErrorTerm); } }
2031 internal Term Eval (Domain domain)
2033 if (objval == null || objval is Symbol || objval is Str
2034 || objval is List<Term>)
2037 domain.CallStackPush (this);
2038 return ((TermValue) objval).Eval (domain);
2040 if (e.Stack == null)
2041 e.Stack = domain.CallStack;
2044 domain.CallStackPop ();
2048 public Term Clone ()
2050 if (objval == null || objval is Symbol)
2053 return new Term (((Str) objval).ToString ());
2054 if (objval is List<Term>)
2056 List<Term> list = new List<Term> ();
2057 list.InsertRange (0, ((List<Term>) objval));
2058 return new Term (list);
2060 return new Term (((TermValue) objval).Clone ());
2063 public static bool operator== (Term t1, Term t2)
2065 return t1.Equals (t2);
2068 public static bool operator!= (Term t1, Term t2) { return ! (t1 == t2); }
2070 public override bool Equals (object obj)
2072 if (! (obj is Term))
2074 Term term = (Term) obj;
2076 return term.IsInt && term.Intval == Intval;
2078 return term.IsSymbol && term.Symval == Symval;
2080 return (term.IsStr && term.Strval.Equals (Strval));
2085 List<Term> l1 = objval as List<Term>;
2086 List<Term> l2 = term.objval as List<Term>;
2088 if (l1.Count != l2.Count)
2090 for (int i = 0; i < l1.Count; i++)
2091 if (! l1[i].Equals (l2[i]))
2095 return ((TermValue) objval).Equals (obj);
2098 public override int GetHashCode () { return intval; }
2100 public bool Matches (Term term)
2103 return term.IsInt && Intval == term.Intval;
2105 return term.IsSymbol && Symval == term.Symval;
2107 return term.IsStr && Strval.Matches (term.Strval);
2112 List<Term> l1 = objval as List<Term>;
2113 List<Term> l2 = term.objval as List<Term>;
2115 if (l1.Count > l2.Count)
2117 for (int i = 0; i < l1.Count; i++)
2118 if (! l1[i].Equals (l2[i]))
2122 return ((TermValue) objval).Matches ((TermValue) term.objval);
2125 public override string ToString () { return ToString (true); }
2127 public string ToString (bool detail)
2132 str = "<integer>" + intval + "</integer>";
2133 else if (objval is Symbol)
2134 str = "<symbol>" + objval + "</symbol>";
2135 else if (objval is Str)
2136 str = "<string>" + objval + "</string>";
2137 else if (objval is List<Term>)
2142 foreach (Term e in (List<Term>) objval)
2149 else if (objval is Term)
2150 str = "<quote>" + objval + "</quote>";
2152 str = ((TermValue) objval).ToString (detail);
2157 private static Term Zero = new Term (0);
2158 private static Term One = new Term (1);
2159 private static Term TermInt = new Term (Qinteger);
2160 private static Term TermStr = new Term (Qstring);
2161 private static Term TermSymbol = new Term (Qsymbol);
2162 private static Term TermList = new Term (Qlist);
2163 private static Term TermTerm = new Term ((Symbol) "term");
2165 private static int parse_integer (XmlNode node)
2167 string str = node.InnerText;
2168 int len = str.Length;
2171 if (len == 2 && str[0] == '?')
2174 && str[1] == 'x' && ((c = str[0]) == '0' || c == '#'))
2176 if (! int.TryParse (str.Substring (2),
2177 Globalization.NumberStyles.HexNumber, null,
2179 throw new Error (Error.InvalidInteger, node,
2180 "Not a integer string: {0}", str);
2183 if (! int.TryParse (str, out i))
2184 throw new Error (Error.InvalidInteger, node,
2185 "Not a integer string: {0}", str);
2189 private static Symbol parse_defvar (Domain domain, XmlNode node)
2191 XmlAttribute name = node.Attributes[Qvname];
2193 throw new Error (Error.NoVariableName, node,
2194 "No variable name to define");
2195 Symbol vname = name.Value;
2199 node = node.FirstChild;
2200 if (node != null && node.Name == Qdescription)
2202 desc = node.InnerText;
2203 node = node.NextSibling;
2209 Symbol type = node.Name;
2210 XmlNodeList range_list = null;
2212 XmlNode n = node.NextSibling;
2216 range_list = n.ChildNodes;
2217 nranges = range_list.Count;
2220 if (type == Qinteger)
2222 int val = parse_integer (node);
2224 if (range_list != null)
2226 range = new int[nranges * 2];
2227 for (int i = 0; i < nranges; i++)
2229 XmlNode nd = range_list[i];
2230 if (nd.Name == Qrange)
2232 range[i * 2] = parse_integer (nd.FirstChild);
2233 range[i * 2 + 1] = parse_integer (nd.LastChild);
2237 range[i * 2] = range[i * 2 + 1]
2238 = parse_integer (nd.FirstChild);
2242 vari = domain.DefvarInt (vname, val, desc, range);
2244 else if (type == Qstring)
2246 string[] range = null;
2247 if (range_list != null)
2249 range = new string[nranges];
2250 for (int i = 0; i < nranges; i++)
2251 range[i] = range_list[i].FirstChild.InnerText;
2253 vari = domain.DefvarStr (vname, node.InnerText, desc, range);
2255 else if (type == Qsymbol)
2257 Symbol[] range = null;
2258 if (range_list != null)
2260 range = new Symbol[nranges];
2261 for (int i = 0; i < nranges; i++)
2262 range[i] = range_list[i].FirstChild.InnerText;
2264 vari = domain.DefvarSym (vname, (Symbol) node.InnerText, desc,
2268 throw new Error (Error.TermTypeInvalid, "Unknown type: {0}", type);
2272 if (domain.variables.TryGetValue (vname, out vari))
2273 vari = vari.Clone (domain);
2275 vari = new Variable (domain, vname, Zero);
2276 domain.variables[vname] = vari;
2281 private static Variable[] parse_args (Domain domain, XmlNode node,
2282 out int min_args, out int max_args)
2289 node = node.FirstChild;
2290 if (node != null && node.Name == Qargs)
2293 for (n = node.FirstChild; n != null; n = n.NextSibling)
2295 if (n.Name == Qfixed)
2297 else if (n.Name == Qoptional)
2299 else if (n.Name == Qrest)
2302 throw new Error (Error.WrongType, n, "Too many <rest>");
2306 throw new Error (Error.WrongType, n,
2307 "Not fixed, optional, nor rest: {0}", n.Name);
2310 max_args = nfixed + noptional + nrest;
2311 args = new Variable[max_args];
2312 n = node.FirstChild;
2313 for (int i = 0; i < max_args; n = n.NextSibling)
2314 args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value);
2316 max_args = - max_args;
2320 min_args = max_args = 0;
2321 args = new Variable[0];
2326 public static Symbol parse_defun_head (Domain domain, XmlNode node)
2328 Symbol name = node.Attributes[Qfname].Value;
2329 int min_args, max_args;
2332 args = parse_args (domain, node, out min_args, out max_args);
2333 if (node.Name == Qdefun)
2334 domain.Defun (name, min_args, max_args, args, null);
2336 domain.Defmacro (name, min_args, max_args, args, null);
2340 public static void parse_defun_body (Domain domain, XmlNode node)
2342 bool is_defun = node.Name == Qdefun;
2343 Symbol name = node.Attributes[Qfname].Value;
2344 Function func = domain.GetFunc (name);
2346 for (node = node.FirstChild; node != null; node = node.NextSibling)
2347 if (node.Name != Qdescription
2348 && node.Name != Qargs)
2350 Term[] body = Parse (domain, node, null);
2352 ((Function.Lambda) func).SetBody (body);
2354 ((Function.Macro) func).SetBody (body);
2357 public static Term Parse (Domain domain, XmlNode node)
2359 Symbol name = node.Name;
2362 if (name == Qinteger)
2363 return new Term (parse_integer (node));
2364 if (name == Qsymbol)
2365 return new Term ((Symbol) node.InnerText);
2366 if (name == Qstring)
2367 return new Term (node.InnerText);
2370 List<Term> list = new List<Term> ();
2371 for (node = node.FirstChild; node != null;
2372 node = node.NextSibling)
2373 list.Add (Parse (domain, node));
2374 return new Term (list);
2376 if (name == Qdefun || name == Qdefmacro)
2378 name = parse_defun_head (domain, node);
2379 parse_defun_body (domain, node);
2380 return new Term (name);
2382 if (name == Qdefvar)
2384 name = parse_defvar (domain, node);
2385 return new Term (name);
2388 if (domain.termtypes.TryGetValue (name, out parser))
2390 object[] arg = new object[] { domain, node };
2391 return new Term ((TermValue) parser.Invoke (null, arg));
2394 Funcall funcall = (Funcall) Funcall.Parser (domain, node);
2395 if (funcall.func is Function.Macro)
2396 return funcall.Eval (domain);
2397 return new Term (funcall);
2402 } catch (Exception e) {
2403 throw new Error (Error.UnknownError, node, e, "Parsing error");
2407 private static bool default_stop (XmlNode n) { return n == null; }
2409 public delegate bool ParseStop (XmlNode node);
2411 public static Term[] Parse (Domain domain, XmlNode node, ParseStop stop)
2414 stop = default_stop;
2417 for (n = node; ! stop (n); n = n.NextSibling)
2418 if (n.NodeType == XmlNodeType.Element
2419 && (n.Name == Qdefun || n.Name == Qdefmacro))
2422 parse_defun_head (domain, n);
2427 } catch (Exception e) {
2428 throw new Error (Error.UnknownError, node, e, "Parsing error");
2432 List<Term> terms = new List<Term> ();
2433 for (; node != n; node = node.NextSibling)
2434 if (node.NodeType == XmlNodeType.Element)
2437 if (node.Name == Qdefun || node.Name == Qdefmacro)
2438 parse_defun_body (domain, node);
2439 else if (node.Name == Qdefvar)
2440 parse_defvar (domain, node);
2442 terms.Add (Parse (domain, node));
2447 } catch (Exception e) {
2448 throw new Error (Error.UnknownError, node, e, "Parsing error");
2451 return terms.ToArray ();
2454 public static Term[] Parse (Domain domain, string url)
2456 XmlDocument doc = new XmlDocument (Symbol.NameTable);
2459 using (XmlTextReader reader = new XmlTextReader (url, doc.NameTable))
2463 } while (reader.NodeType != XmlNodeType.None
2464 && (reader.NodeType != XmlNodeType.Element
2465 || reader.Name != Qexpr));
2466 if (reader.NodeType == XmlNodeType.None)
2467 throw new Exception ("Node <expr> not found");
2468 node = doc.ReadNode (reader);
2470 return Parse (domain, node.FirstChild, null);
2473 public static Term Eval (Domain domain, Term[] terms)
2478 foreach (Term term in terms)
2480 result = term.Eval (domain);
2481 if (domain.Thrown ())
2487 } catch (Exception e) {
2488 throw new Error (Error.UnknownError, null, e, "Runtime error");