2 using System.Collections;
3 using System.Collections.Generic;
5 using System.Reflection;
10 public class Xexpression
12 private static int debug_depth = 0;
14 public static int DebugDepth {
15 get { return debug_depth; }
16 set { debug_depth = value; }
19 public struct Symbol : IEquatable<Symbol>
21 private static NameTable nt = new NameTable ();
25 public Symbol (string str) { name = nt.Add (str); }
27 public static implicit operator Symbol (string str)
29 return new Symbol (str);
32 public static implicit operator string (Symbol sym) { return sym.name; }
34 public static bool operator== (Symbol n1, Symbol n2)
36 return (object) n1.name == (object) n2.name;
39 public static bool operator!= (Symbol n1, Symbol n2)
41 return (object) n1.name != (object) n2.name;
44 public static bool operator== (Symbol n1, string n2)
46 return (object) n1.name == (object) n2;
49 public static bool operator!= (Symbol n1, string n2)
51 return (object) n1.name != (object) n2;
54 public static bool operator== (string n1, Symbol n2)
56 return (object) n1 == (object) n2.name;
59 public static bool operator!= (string n1, Symbol n2)
61 return (object) n1 != (object) n2.name;
64 public bool Equals (Symbol name)
66 return Object.ReferenceEquals (this.name, name.name);
69 public override bool Equals (object obj)
71 return Object.ReferenceEquals (this.name, obj);
74 public override int GetHashCode ()
76 return name.GetHashCode ();
79 public static NameTable NameTable { get { return nt; } }
81 public override string ToString () { return name; }
84 private static Symbol Qexpr = "expr";
86 private static Symbol Qnull = "";
87 private static Symbol Qfuncall = "funcall";
88 private static Symbol Qinteger = "integer";
89 private static Symbol Qstring = "string";
90 private static Symbol Qsymbol = "symbol";
91 private static Symbol Qlist = "list";
93 public static Symbol Qdefun = "defun";
94 public static Symbol Qdefmacro = "defmacro";
95 private static Symbol Qfname = "fname";
96 private static Symbol Qargs = "args";
97 private static Symbol Qfixed = "fixed";
98 private static Symbol Qoptional = "optional";
99 private static Symbol Qrest = "rest";
101 public static Symbol Qdefvar = "defvar";
102 private static Symbol Qvname = "vname";
103 private static Symbol Qdescription = "description";
104 private static Symbol Qrange = "range";
106 public abstract class Function
109 public int min_arg, max_arg;
111 public Function () { }
113 public Function (Symbol name, int min_arg, int max_arg)
116 this.min_arg = min_arg;
117 this.max_arg = max_arg;
120 public abstract Term Call (Domain domain, Variable vari, Term[] args);
122 public override string ToString ()
127 internal class Subroutine : Function
129 public Builtin builtin;
132 public Subroutine (Builtin builtin, Symbol name, bool setvar,
133 int min_arg, int max_arg)
134 : base (name, min_arg, max_arg)
136 this.builtin = builtin;
137 this.setvar = setvar;
140 public override Term Call (Domain domain, Variable vari, Term[] args)
144 args = (Term[]) args.Clone ();
145 for (int i = 0; i < args.Length; i++)
147 args[i] = args[i].Eval (domain);
152 return builtin (domain, vari, args);
156 internal class SpecialForm : Function
158 public Builtin builtin;
160 public SpecialForm (Builtin builtin, Symbol name,
161 int min_arg, int max_arg)
162 : base (name, min_arg, max_arg)
164 this.builtin = builtin;
167 public override Term Call (Domain domain, Variable vari, Term[] args)
169 return builtin (domain, vari, args);
173 private static void parse_head (Domain domain, XmlNode node,
175 out int min_arg, out int max_arg,
181 name = node.Attributes[Qfname].Value;
183 node = node.FirstChild;
184 if (node != null && node.Name == Qargs)
187 for (n = node.FirstChild; n != null; n = n.NextSibling)
189 if (n.Name == Qfixed)
191 else if (n.Name == Qoptional)
193 else if (n.Name == Qrest)
196 throw new Exception ("Invalid argument type: " + n);
199 max_arg = nfixed + noptional + nrest;
200 args = new Variable[max_arg];
202 for (int i = 0; i < max_arg; n = n.NextSibling)
203 args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value);
209 min_arg = max_arg = 0;
214 private static void parse_body (Domain domain, XmlNode node,
217 for (node = node.FirstChild; node != null; node = node.NextSibling)
218 if (node.Name != Qdescription
219 && node.Name != Qargs)
222 for (XmlNode n = node; n != null; n = n.NextSibling)
226 body = new Term[nterms];
227 for (nterms = 0; node != null; node = node.NextSibling, nterms++)
228 body[nterms] = new Term (domain, node);
234 internal class Macro : Function
236 internal Variable[] args;
237 internal Term[] body;
239 public Macro (Domain domain, XmlNode node)
241 parse_head (domain, node, out name, out min_arg, out max_arg,
245 public void SetBody (Domain domain, XmlNode node)
247 parse_body (domain, node, out body);
250 public override Term Call (Domain domain, Variable vari, Term[] args)
252 Bindings current = domain.bindings;
256 for (int i = 0; i < min_arg; i++)
257 domain.Bind (this.args[i], args[i]);
261 domain.Catch (CatchTag.Return);
262 foreach (Term term in body)
264 result = term.Eval (domain);
273 domain.UnboundTo (current);
279 internal class Lambda : Function
281 internal Variable[] args;
282 internal Term[] body;
284 public Lambda (Domain domain, XmlNode node)
286 parse_head (domain, node, out name, out min_arg, out max_arg,
290 public Lambda (Domain domain, Symbol name, Symbol[] args)
300 for (i = 0; i < args.Length; i++, nfixed++)
301 if (args[i] == Qoptional || args[i] == Qrest)
305 if (args[i] == Qoptional)
307 for (i++; i < args.Length; i++, noptional++)
308 if (args[i] == Qrest)
315 max_arg = nfixed + noptional + nrest;
316 this.args = new Variable[max_arg];
318 for (i = j = 0; j < this.args.Length; i++)
319 if (args[i] != Qoptional || args[i] != Qrest)
320 this.args[j++] = domain.Defvar (args[i]);
324 min_arg = max_arg = 0;
328 public void SetBody (Domain domain, XmlNode node)
330 parse_body (domain, node, out body);
333 public void SetBody (Term[] body)
338 public override Term Call (Domain domain, Variable vari, Term[] args)
340 Bindings current = domain.bindings;
347 Term[] newargs = new Term[args.Length];
348 for (i = 0; i < min_arg; i++)
349 newargs[i] = args[i].Eval (domain);
352 for (i = 0; i < min_arg; i++)
353 domain.Bind (this.args[i], args[i]);
357 domain.Catch (CatchTag.Return);
358 foreach (Term term in body)
360 result = term.Eval (domain);
369 domain.UnboundTo (current);
376 public class Variable
378 public Domain domain;
379 public readonly Symbol name;
382 public Variable (Domain domain, Symbol name, Term val)
384 this.domain = domain;
389 public virtual bool ValueP (Term val) { return true; }
391 public virtual Variable Clone (Domain domain)
393 return new Variable (domain, name, val);
396 public virtual void Reset () { val = Zero; }
402 if (! ValueP (value))
403 throw new Exception ("Invalid value: " + value);
408 public Term SetValue (int i)
415 public Term SetValue (string s)
421 public override string ToString () { return name + "(" + val + ")"; }
423 public abstract class Typed : Variable
425 protected string desc;
426 private Term default_val;
428 protected Typed (Domain domain, Symbol name, Term val, string desc)
429 : base (domain, name, val)
435 public override void Reset () { val = default_val; }
437 public string Description {
439 set { desc = value; }
443 public class Int : Typed
447 public bool IsSubrange (int[] r)
451 for (int i = 0; i < r.Length; i += 2)
454 for (j = 0; j < range.Length; j += 2)
455 if (range[j] <= r[i] && range[j + 1] >= r[i + 1])
457 if (j >= range.Length)
463 public Int (Domain domain, Symbol name, int n, string desc, int[] range)
464 : base (domain, name, new Term (n), desc)
466 if (range != null && range.Length % 2 == 1)
467 throw_exception ("Range length for {0} not even", name);
470 throw_exception ("Invalid integer value for {0}: {1}", name, val);
473 public override bool ValueP (Term term)
480 for (int i = 0; i < range.Length; i += 2)
481 if (range[i] <= n && range[i + 1] >= n)
486 public override Variable Clone (Domain domain)
488 return new Int (domain, name, val.Intval, desc, range);
491 public int[] Range { get { return range; } set { range = value; } }
494 public class Str : Typed
496 private string[] range;
498 public bool IsSubrange (string[] r)
502 for (int i = 0; i < r.Length; i++)
505 for (j = 0; j < range.Length; j++)
506 if (range[j] == r[i])
508 if (j >= range.Length)
514 public Str (Domain domain, Symbol name, string str, string desc,
516 : base (domain, name, new Term (str), desc)
520 throw_exception ("Invalid string value for {0}: {1}", name, val);
523 public override bool ValueP (Term term)
529 string str = term.Strval;
530 foreach (string s in range)
536 public override Variable Clone (Domain domain)
538 return new Str (domain, name, val.Strval, desc, range);
541 public string[] Range { get { return range; } set { range = value; } }
544 public class Sym : Typed
546 public Symbol[] range;
548 public bool IsSubrange (Symbol[] r)
552 for (int i = 0; i < r.Length; i++)
555 for (j = 0; j < range.Length; j++)
556 if (range[j] == r[i])
558 if (j >= range.Length)
564 public Sym (Domain domain, Symbol name, Symbol sym, string desc,
566 : base (domain, name, new Term (sym), desc)
570 throw_exception ("Invalid symbol value for {0}: {1}", name, val);
573 public override bool ValueP (Term term)
579 Symbol name = term.Symval;
580 foreach (Symbol n in range)
586 public override Variable Clone (Domain domain)
588 return new Sym (domain, name, val.Symval, desc, range);
591 public Symbol[] Range { get { return range; } set { range = value; } }
595 internal class Bindings
597 private Variable vari;
598 private Term old_value;
599 private Bindings next;
601 private Bindings (Variable vari)
604 old_value = vari.Value;
607 public static Bindings Bind (Bindings bindings, Variable vari, Term val)
609 Bindings b = new Bindings (vari);
616 internal Bindings UnboundTo (Bindings boundary)
618 for (Bindings b = this; b != boundary; b = b.next)
619 b.vari.Value = b.old_value;
623 public override string ToString ()
625 string str = "(bindings";
626 for (Bindings b = this; b != null; b = b.next)
627 str += " " + vari.name + "=" + b.old_value;
632 private static void throw_exception (string msg)
634 throw new Exception (msg);
637 private static void throw_exception (string fmt, params object[] args)
639 throw new Exception (String.Format (fmt, args));
642 internal class CatchTag : IEquatable<CatchTag>
646 public CatchTag (Symbol sym) { val = (string) sym; }
647 private CatchTag (int i) { val = i; }
649 public static CatchTag Return = new CatchTag (0);
650 public static CatchTag Break = new CatchTag (1);
652 public static bool operator== (CatchTag t1, CatchTag t2)
653 { return t1.val == t2.val; }
655 public static bool operator!= (CatchTag t1, CatchTag t2)
656 { return t1.val != t2.val; }
658 public bool Equals (CatchTag tag) { return this.val == tag.val; }
659 public override bool Equals (object val) { return this.val == val; }
661 public override int GetHashCode () { return val.GetHashCode (); }
667 public object context;
668 public int depth = 0;
670 internal Dictionary<Symbol, MethodInfo> termtypes
671 = new Dictionary<Symbol, MethodInfo> ();
672 internal Dictionary<Symbol, Function> functions
673 = new Dictionary<Symbol, Function> ();
674 internal Dictionary<Symbol, Variable> variables
675 = new Dictionary<Symbol, Variable> ();
676 internal Bindings bindings;
677 private Stack<CatchTag> catch_stack = new Stack<CatchTag> ();
678 private int catch_count = 0;
680 internal Domain (Symbol name) { this.name = name; }
682 public Domain (Symbol name, object context)
683 : this (name, basic, context) { }
685 public Domain (Symbol name, Domain parent, object context) : this (name)
687 termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
688 functions = new Dictionary<Symbol, Function> (parent.functions);
689 variables = new Dictionary<Symbol, Variable> (parent.variables);
690 this.context = context;
693 internal void Bind (Variable vari, Term value)
695 bindings = Bindings.Bind (bindings, vari, value);
698 internal void UnboundTo (Bindings boundary)
700 if (bindings != null)
701 bindings = bindings.UnboundTo (boundary);
704 internal void Catch (CatchTag tag)
706 catch_stack.Push (tag);
710 internal void Uncatch ()
713 if (catch_count > catch_stack.Count)
718 get { return catch_count < catch_stack.Count; }
721 internal void ThrowReturn ()
723 foreach (CatchTag tag in catch_stack)
726 if (tag == CatchTag.Return)
731 internal void ThrowBreak ()
733 if (catch_stack.Peek () != CatchTag.Break)
734 throw_exception ("No outer loop to break");
738 internal void ThrowTag (CatchTag tag)
740 foreach (CatchTag elt in catch_stack)
748 public void DefType (Type type)
750 if (! type.IsSubclassOf (typeof (TermValue)))
751 throw new Exception ("Not a subclass of TermValue: " + type);
752 BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
753 FieldInfo finfo = type.GetField ("name", flags);
754 if (finfo == null || finfo.FieldType != typeof (Symbol))
755 throw new Exception ("No \"name\" field of string type: " + type);
756 Symbol name = (Symbol) finfo.GetValue (null);
757 if (termtypes.ContainsKey (name)
758 || functions.ContainsKey (name))
759 throw new Exception ("already defined: " + name);
760 Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
761 MethodInfo minfo = type.GetMethod ("Parser", types);
762 if (minfo == null || minfo.ReturnType != typeof (TermValue))
763 throw new Exception ("No \"Parser\" method of correct type: " + type);
764 termtypes[name] = minfo;
767 public void DefSubr (Builtin builtin, string str, bool setvar,
768 int min_arg, int max_arg, params string[] aliases)
771 if (termtypes.ContainsKey (name))
772 throw new Exception ("already defined as termtype: " + name);
773 Function func = new Function.Subroutine (builtin, name, setvar,
775 functions[name] = func;
776 foreach (string a in aliases)
777 functions[(Symbol) a] = func;
780 public void DefSpecial (Builtin builtin, string str,
781 int min_arg, int max_arg,
782 params string[] aliases)
785 if (termtypes.ContainsKey (name))
786 throw new Exception ("already defined as termtype: " + name);
787 Function func = new Function.SpecialForm (builtin, name,
789 functions[name] = func;
790 foreach (string a in aliases)
791 functions[(Symbol) a] = func;
794 public void DefAlias (string alias, string str)
796 functions[(Symbol) alias] = functions[(Symbol) str];
799 public void Defun (Symbol name, Symbol[] args, Term[] body,
804 if (termtypes.ContainsKey (name))
805 throw new Exception ("already defined as termtype: " + name);
806 if (prototype || ! functions.TryGetValue (name, out func))
808 func = new Function.Lambda (this, name, args);
809 functions[name] = func;
812 ((Function.Lambda) func).SetBody (body);
815 public void Defun (XmlNode node, bool prototype)
817 Symbol name = node.Attributes[Qfname].Value;
818 if (termtypes.ContainsKey (name))
819 throw new Exception ("already defined as termtype: " + name);
822 if (prototype || ! functions.TryGetValue (name, out func))
824 func = new Function.Lambda (this, node);
825 functions[name] = func;
828 ((Function.Lambda) func).SetBody (this, node);
831 public void Defun (Function func)
833 functions[func.name] = func;
836 public void Defmacro (XmlNode node, bool prototype)
838 Symbol name = node.Attributes[Qfname].Value;
839 if (termtypes.ContainsKey (name))
840 throw new Exception ("already defined as termtype: " + name);
843 if (prototype || ! functions.TryGetValue (name, out func))
845 func = new Function.Macro (this, node);
846 functions[name] = func;
849 ((Function.Macro) func).SetBody (this, node);
852 public Variable Defvar (XmlNode node)
854 Symbol name = node.Attributes[0].Value;
858 node = node.FirstChild;
859 if (node != null && node.Name == Qdescription)
861 desc = node.InnerText;
862 node = node.NextSibling;
868 Symbol type = node.Name;
869 XmlNodeList range_list = null;
871 string val = node.InnerText;
873 node = node.NextSibling;
876 range_list = node.ChildNodes;
877 nranges = range_list.Count;
880 if (type == Qinteger)
882 int n = parse_integer (val);
884 if (range_list != null)
886 range = new int[nranges * 2];
887 for (int i = 0; i < nranges; i++)
889 XmlNode nd = range_list[i];
890 if (nd.Name == Qrange)
893 = parse_integer (nd.FirstChild.InnerText);
895 = parse_integer (nd.LastChild.InnerText);
901 = parse_integer (nd.FirstChild.InnerText);
905 vari = DefvarInt (name, n, desc, range);
907 else if (type == Qstring)
909 string[] range = null;
910 if (range_list != null)
912 range = new string[nranges];
913 for (int i = 0; i < nranges; i++)
914 range[i] = range_list[i].FirstChild.InnerText;
916 vari = DefvarStr (name, val, desc, range);
918 else if (type == Qsymbol)
920 Symbol[] range = null;
921 if (range_list != null)
923 range = new Symbol[nranges];
924 for (int i = 0; i < nranges; i++)
925 range[i] = range_list[i].FirstChild.InnerText;
927 vari = DefvarSym (name, (Symbol) val, desc, range);
930 throw new Exception ("Unknown type: " + type);
934 if (variables.TryGetValue (name, out vari))
935 vari = vari.Clone (this);
937 vari = new Variable (this, name, Zero);
938 variables[name] = vari;
943 public Variable Defvar (Variable vari)
945 vari = vari.Clone (this);
946 variables[vari.name] = vari;
950 internal Variable Defvar (Symbol name)
952 Variable vari = new Variable (this, name, Zero);
953 variables[name] = vari;
957 public Variable DefvarInt (Symbol name, int n, string desc, int[] range)
961 if (variables.TryGetValue (name, out vari))
963 Variable.Int intvari = vari as Variable.Int;
965 throw new Exception ("Variable type mismatch: " + name);
968 if (! intvari.IsSubrange (range))
969 throw new Exception ("Variable range mismatch: " + name);
970 intvari.Range = range;;
973 intvari.Description = desc;
977 vari = new Variable.Int (this, name, n, desc, range);
978 variables[name] = vari;
983 public Variable DefvarStr (Symbol name, string str, string desc,
988 if (variables.TryGetValue (name, out vari))
990 Variable.Str strvari = vari as Variable.Str;
992 throw new Exception ("Variable type mismatch: " + name);
995 if (! strvari.IsSubrange (range))
996 throw new Exception ("Variable range mismatch: " + name);
997 strvari.Range = range;
1000 strvari.Description = desc;
1004 vari = new Variable.Str (this, name, str, desc, range);
1005 variables[name] = vari;
1010 public Variable DefvarSym (Symbol name, Symbol sym, string desc,
1015 if (variables.TryGetValue (name, out vari))
1017 Variable.Sym symvari = vari as Variable.Sym;
1018 if (symvari == null)
1019 throw new Exception ("Variable type mismatch: " + name);
1022 if (! symvari.IsSubrange (range))
1023 throw new Exception ("Variable range mismatch: " + name);
1024 symvari.Range = range;
1027 symvari.Description = desc;
1031 vari = new Variable.Sym (this, name, sym, desc, range);
1032 variables[name] = vari;
1037 internal Function GetFunc (Symbol name)
1041 if (! functions.TryGetValue (name, out func))
1042 throw new Exception ("Unknown function: " + name);
1046 public bool CopyFunc (Domain domain, Symbol name)
1048 Function func = GetFunc (name);
1050 domain.functions[name] = func;
1054 public void CopyFunc (Domain domain)
1056 foreach (KeyValuePair<Symbol, Function> kv in functions)
1057 domain.functions[kv.Key] = kv.Value;
1060 public Variable GetVar (Symbol name, bool create)
1064 if (! variables.TryGetValue (name, out vari))
1068 variables[name] = vari = new Variable (this, name, Zero);
1073 public override string ToString ()
1075 string str = "<(functions";
1076 foreach (KeyValuePair<Symbol, Function> kv in functions)
1077 str += " " + kv.Key;
1078 str += ") (variabls";
1079 foreach (KeyValuePair<Symbol, Variable> kv in variables)
1080 str += " " + kv.Value;
1082 if (bindings != null)
1083 str += " " + bindings;
1084 if (context != null)
1085 str += " (" + context + ")";
1090 internal void DebugWrite (string fmt, params string[] arg)
1092 if (debug_depth > depth)
1094 for (int i = 0; i < depth; i++)
1095 Console.Write (" ");
1096 Console.WriteLine (fmt, arg);
1100 public object SaveValues ()
1102 Dictionary<Variable,Term> values = new Dictionary<Variable,Term> ();
1104 foreach (KeyValuePair<Symbol,Variable> kv in variables)
1105 values[kv.Value] = kv.Value.Value.Clone ();
1109 public void RestoreValues (object values)
1111 foreach (KeyValuePair<Variable,Term> kv
1112 in (Dictionary<Variable,Term>) values)
1113 kv.Key.Value = kv.Value;
1117 public delegate Term Builtin (Domain domain, Variable vari, Term[] args);
1119 private static Domain basic = new Domain ("basic");
1121 static Xexpression ()
1123 basic.DefType (typeof (Varref));
1124 basic.DefType (typeof (Funcall));
1126 basic.DefSubr (Fset, "set", true, 1, 1, "=");
1127 basic.DefSubr (Fnot, "not", false, 1, 1, "!");
1128 basic.DefSubr (Fadd, "add", true, 1, -1, "+");
1129 basic.DefSubr (Fmul, "mul", true, 1, -1, "*");
1130 basic.DefSubr (Fsub, "sub", true, 1, -1, "-");
1131 basic.DefSubr (Fdiv, "div", true, 1, -1, "/");
1132 basic.DefSubr (Fmod, "mod", true, 1, 2, "%");
1133 basic.DefSubr (Flogior, "logior", true, 1, -1, "|");
1134 basic.DefSubr (Flogand, "logand", true, 1, -1, "&");
1135 basic.DefSubr (Flsh, "lsh", true, 1, 2, "<<");
1136 basic.DefSubr (Frsh, "rsh", true, 1, 2, ">>");
1137 basic.DefSubr (Feq, "eq", false, 2, -1, "==");
1138 basic.DefSubr (Fnoteq, "noteq", false, 2, 2, "!=");
1139 basic.DefSubr (Flt, "lt", false, 2, -1, "<");
1140 basic.DefSubr (Fle, "le", false, 2, -1, "<=");
1141 basic.DefSubr (Fgt, "gt", false, 2, -1, ">");
1142 basic.DefSubr (Fge, "ge", false, 2, -1, ">=");
1143 basic.DefSubr (Fappend, "append", true, 0, -1);
1144 basic.DefSubr (Fconcat, "concat", true, 0, -1);
1145 basic.DefSubr (Fnth, "nth", false, 2, 2);
1146 basic.DefSubr (Fcopy, "copy", false, 1, 1);
1147 basic.DefSubr (Fins, "ins", true, 2, 2);
1148 basic.DefSubr (Fdel, "del", true, 2, 2);
1149 basic.DefSubr (Feval, "eval", false, 1, 1);
1150 basic.DefSubr (Fbreak, "break", false, 0, 1);
1151 basic.DefSubr (Freturn, "return", false, 0, 1);
1153 basic.DefSpecial (Fand, "and", 1, -1, "&&");
1154 basic.DefSpecial (For, "or", 1, -1, "||");
1155 basic.DefSpecial (Fprogn, "progn", 0, -1, "expr");
1156 basic.DefSpecial (Fif, "if", 2, 3);
1157 basic.DefSpecial (Fwhen, "when", 1, -1);
1158 basic.DefSpecial (Floop, "loop", 1, -1);
1159 basic.DefSpecial (Fwhile, "while", 1, -1);
1160 basic.DefSpecial (Fcond, "cond", 1, -1);
1161 basic.DefSpecial (Fforeach, "foreach", 2, -1);
1162 basic.DefSpecial (Fquote, "quote", 1, 1);
1163 basic.DefSpecial (Ftype, "type", 1, 1);
1164 basic.DefSpecial (Fcatch, "catch", 2, 2);
1165 basic.DefSpecial (Fthrow, "throw", 1, 2);
1168 private static Term Fset (Domain domain, Variable vari, Term[] args)
1170 vari.Value = args[0];
1174 private static Term Fnot (Domain domain, Variable vari, Term[] args)
1176 return args[0].IsTrue ? Zero : One;
1179 private static Term Fadd (Domain domain, Variable vari, Term[] args)
1181 int n = vari == null ? 0 : vari.Value.Intval;
1183 foreach (Term arg in args)
1185 return (vari == null ? new Term (n) : vari.SetValue (n));
1188 private static Term Fmul (Domain domain, Variable vari, Term[] args)
1190 int n = vari == null ? 1 : vari.Value.Intval;
1191 foreach (Term arg in args)
1193 return (vari == null ? new Term (n) : vari.SetValue (n));
1196 private static Term Fsub (Domain domain, Variable vari, Term[] args)
1207 n = vari.Value.Intval;
1210 while (i < args.Length)
1211 n -= args[i++].Intval;
1212 return (vari == null ? new Term (n) : vari.SetValue (n));
1215 private static Term Fdiv (Domain domain, Variable vari, Term[] args)
1226 n = vari.Value.Intval;
1229 while (i < args.Length)
1230 n /= args[i++].Intval;
1231 return (vari == null ? new Term (n) : vari.SetValue (n));
1234 private static Term Fmod (Domain domain, Variable vari, Term[] args)
1236 int n = args[0].Intval % args[1].Intval;
1238 return (vari == null ? new Term (n) : vari.SetValue (n));
1241 private static Term Flogior (Domain domain, Variable vari, Term[] args)
1243 int n = vari == null ? 0 : vari.Value.Intval;
1244 foreach (Term arg in args)
1246 return (vari == null ? new Term (n) : vari.SetValue (n));
1249 private static Term Flogand (Domain domain, Variable vari, Term[] args)
1260 n = vari.Value.Intval;
1263 while (i < args.Length)
1264 n &= args[i++].Intval;
1265 return (vari == null ? new Term (n) : vari.SetValue (n));
1268 private static Term Flsh (Domain domain, Variable vari, Term[] args)
1270 int n = args[0].Intval << args[1].Intval;
1271 return (vari == null ? new Term (n) : vari.SetValue (n));
1274 private static Term Frsh (Domain domain, Variable vari, Term[] args)
1276 int n = args[0].Intval >> args[1].Intval;
1277 return (vari == null ? new Term (n) : vari.SetValue (n));
1280 private static Term Feq (Domain domain, Variable vari, Term[] args)
1284 if (o.objval == null)
1286 for (int i = 1; i < args.Length; i++)
1287 if (args[i].objval != null || args[i].intval != o.intval)
1292 for (int i = 1; i < args.Length; i++)
1293 if (o.objval.Equals (args[i].objval))
1299 private static Term Fnoteq (Domain domain, Variable vari, Term[] args)
1301 return Feq (domain, vari, args);
1304 private static Term Flt (Domain domain, Variable vari, Term[] args)
1306 int n = args[0].Intval;
1308 for (int i = 1; i < args.Length; i++)
1310 int n1 = args[i].Intval;
1318 private static Term Fle (Domain domain, Variable vari, Term[] args)
1320 int n = args[0].Intval;
1321 for (int i = 1; i < args.Length; i++)
1323 int n1 = args[i].Intval;
1331 private static Term Fgt (Domain domain, Variable vari, Term[] args)
1333 int n = args[0].Intval;
1334 for (int i = 1; i < args.Length; i++)
1336 int n1 = args[i].Intval;
1344 private static Term Fge (Domain domain, Variable vari, Term[] args)
1346 int n = args[0].Intval;
1347 for (int i = 1; i < args.Length; i++)
1349 int n1 = args[i].Intval;
1357 private static Term Fappend (Domain domain, Variable vari, Term[] args)
1362 list = new List<Term> ();
1364 list = vari.Value.Listval;
1366 foreach (Term arg in args)
1369 list.AddRange ((List<Term>) arg.objval);
1377 result.objval = list;
1383 private static Term Fconcat (Domain domain, Variable vari, Term[] args)
1390 str = vari.Value.Strval;
1392 foreach (Term arg in args)
1395 str += (string) arg.objval;
1396 else if (arg.IsList)
1397 foreach (Term term in (List<Term>) arg.objval)
1398 str += (char) term.Intval;
1400 str += (char) arg.Intval;
1410 return vari.SetValue (str);
1413 private static Term Fnth (Domain domain, Variable vari, Term[] args)
1419 result.intval = ((string) args[1].objval)[args[0].Intval];
1420 result.objval = null;
1422 else if (args[1].IsList)
1424 result = ((List<Term>) args[1].objval)[args[0].Intval];
1427 throw new Exception ("Term is not enumelable: " + args[1]);
1431 private static Term Fcopy (Domain domain, Variable vari, Term[] args)
1436 result.objval = new List<Term> (args[0].Listval);
1440 private static Term Fins (Domain domain, Variable vari, Term[] args)
1442 Term term = vari.Value;
1446 string str = term.Strval.Insert (args[0].Intval, args[1].Strval);
1447 vari.SetValue (str);
1449 else if (vari.Value.IsList)
1450 vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval);
1452 throw new Exception ("term is not collection: " + vari.Value);
1456 private static Term Fdel (Domain domain, Variable vari, Term[] args)
1458 if (vari.Value.IsStr)
1461 = vari.Value.Strval.Remove (args[0].Intval,
1462 args[1].Intval - args[0].Intval);
1463 vari.SetValue (str);
1465 else if (vari.Value.IsList)
1466 vari.Value.Listval.RemoveRange (args[0].Intval,
1467 args[1].Intval - args[0].Intval);
1469 throw new Exception ("term is not collection: " + vari.Value);
1473 private static Term Fand (Domain domain, Variable vari, Term[] args)
1475 foreach (Term arg in args)
1476 if (! arg.Eval (domain).IsTrue)
1481 private static Term For (Domain domain, Variable vari, Term[] args)
1483 foreach (Term arg in args)
1484 if (arg.Eval (domain).IsTrue)
1489 private static Term Feval (Domain domain, Variable vari, Term[] args)
1491 return (args[0].Eval (domain));
1494 private static Term Fprogn (Domain domain, Variable vari, Term[] args)
1498 foreach (Term arg in args)
1499 result = arg.Eval (domain);
1503 private static Term Fif (Domain domain, Variable vari, Term[] args)
1505 if (args[0].Eval (domain).IsTrue)
1506 return args[1].Eval (domain);
1507 if (args.Length == 2)
1509 return args[2].Eval (domain);
1512 private static Term Fwhen (Domain domain, Variable vari, Term[] args)
1514 if (! args[0].Eval (domain).IsTrue)
1517 for (int i = 1; i < args.Length; i++)
1518 result = args[i].Eval (domain);
1522 private static Term Freturn (Domain domain, Variable vari, Term[] args)
1524 domain.ThrowReturn ();
1525 return args.Length == 0 ? Zero : args[0];
1528 private static Term Fbreak (Domain domain, Variable vari, Term[] args)
1530 domain.ThrowBreak ();
1531 return args.Length == 0 ? Zero : args[0];
1534 private static Term Floop (Domain domain, Variable vari, Term[] args)
1538 domain.Catch (CatchTag.Break);
1539 while (! domain.Thrown)
1540 foreach (Term arg in args)
1542 result = arg.Eval (domain);
1552 private static Term Fwhile (Domain domain, Variable vari, Term[] args)
1556 domain.Catch (CatchTag.Break);
1557 while (! domain.Thrown && args[0].Eval (domain).IsTrue)
1558 for (int i = 1; i < args.Length; i++)
1560 result = args[i].Eval (domain);
1570 private static Term Fcond (Domain domain, Variable vari, Term[] args)
1572 foreach (Term arg in args)
1574 List<Term> list = arg.Listval;
1575 Term result = list[0].Eval (domain);
1579 for (int i = 1; i < list.Count; i++)
1582 result = list[i].Eval (domain);
1593 private static Term Fforeach (Domain domain, Variable vari,
1596 Term result = args[0].Eval (domain);
1599 List<Term> list = result.Listval;
1600 Bindings current = domain.bindings;
1603 domain.Catch (CatchTag.Break);
1604 foreach (Term term in list)
1606 domain.Bind (vari, term);
1608 for (int i = 1; i < args.Length; i++)
1610 result = args[i].Eval (domain);
1615 domain.UnboundTo (current);
1624 private static Term Fquote (Domain domain, Variable vari, Term[] args)
1626 return new Term (args[0]);
1629 private static Term Ftype (Domain domain, Variable vari, Term[] args)
1635 if (args[0].IsSymbol)
1642 public static Term Fcatch (Domain domain, Variable vari, Term[] args)
1646 domain.Catch (new CatchTag (args[0].Symval));
1647 result = args[1].Eval (domain);
1654 public static Term Fthrow (Domain domain, Variable vari, Term[] args)
1656 domain.ThrowTag (new CatchTag (args[0].Symval));
1657 return (args.Length == 1 ? Zero : args[1]);
1660 public delegate TermValue TermParser (Domain domain, XmlNode node);
1662 public abstract class TermValue
1664 public virtual Term Eval (Domain domain) { return new Term (this); }
1665 public virtual TermValue Clone () { return this; }
1668 private class Varref : TermValue
1670 private static Symbol name = "varref";
1671 public static Symbol Name { get { return name; } }
1673 private Symbol vname;
1674 private Variable vari;
1676 public Varref (Symbol vname) { this.vname = vname; }
1678 public override Term Eval (Domain domain)
1680 if (vari == null || vari.domain != domain)
1681 vari = domain.GetVar (vname, true);
1685 public static TermValue Parser (Domain domain, XmlNode node)
1687 return new Varref ((Symbol) node.Attributes[Qvname].Value);
1690 public override string ToString ()
1692 return "<varref vname=\"" + vname + "\"/>";
1696 private class Funcall : TermValue
1698 private static Symbol name = "funcall";
1700 public static Symbol Name { get { return name; } }
1702 internal Function func;
1703 internal Variable vari;
1704 internal Term[] args;
1706 public Funcall (Function func, Variable vari, Term[] args)
1710 int nargs = args.Length;
1711 if (nargs < func.min_arg
1712 || (func.max_arg >= 0 && nargs > func.max_arg))
1713 throw_exception ("Invalid number of arguments to {0}: ",
1721 public static TermValue Parser (Domain domain, XmlNode node)
1723 Symbol fname = node.Name;
1726 if (fname == Qfuncall)
1727 fname = node.Attributes[Qfname].Value;
1728 Function func = domain.GetFunc (fname);
1730 attr = node.Attributes[Qvname];
1731 vari = attr == null ? null : domain.GetVar (attr.Value, true);
1732 XmlNodeList nlist = node.ChildNodes;
1733 int nargs = nlist.Count;
1734 Term[] args = new Term[nargs];
1735 for (int i = 0; i < nargs; i++)
1736 args[i] = new Term (domain, nlist[i]);
1737 return new Funcall (func, vari, args);
1740 public override Term Eval (Domain domain)
1742 domain.DebugWrite (ToString ());
1744 Term result = func.Call (domain, vari, args);
1746 domain.DebugWrite ("=> {0}", result.ToString ());
1750 public override TermValue Clone ()
1752 return new Funcall (func, vari, args);
1755 public override string ToString ()
1757 string str = "<" + func.name;
1759 str += " vname=\"" + vari.name + "\"";
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 + ">");
1778 public object objval;
1780 // <integer>...</integer>
1781 public Term (int i) { intval = i; objval = null; }
1782 // <symbol>...</symbol>
1783 public Term (Symbol name) { intval = 0; objval = name; }
1784 // <string>...</string>
1785 public Term (string str) { intval = 0; objval = str; }
1787 public Term (List<Term> list) { intval = 0; objval = list; }
1789 public Term (Term term) { intval = term.intval; objval = term.objval; }
1790 public Term (TermValue obj) { intval = 0; objval = obj; }
1792 public Term (Domain domain, XmlNode node)
1794 Symbol name = node.Name;
1796 if (name == Qinteger)
1798 intval = parse_integer (node.InnerText);
1804 if (name == Qsymbol)
1805 objval = (Symbol) node.InnerText;
1806 else if (name == Qstring)
1807 objval = node.InnerText.Clone ();
1808 else if (name == Qlist)
1810 List<Term> list = new List<Term> ();
1811 for (node = node.FirstChild; node != null;
1812 node = node.NextSibling)
1813 list.Add (new Term (domain, node));
1820 if (domain.termtypes.TryGetValue (name, out minfo))
1821 objval = (TermValue) minfo.Invoke (null, new Object[] { domain, node});
1824 Funcall funcall = (Funcall) Funcall.Parser (domain, node);
1825 if (funcall.func is Function.Macro)
1827 Term result = funcall.Eval (domain);
1828 intval = result.intval;
1829 objval = result.objval;
1838 // <varref vname="VNAME"/>
1839 public Term (Domain domain, Symbol vname)
1842 objval = new Varref (vname);
1845 // <funcall fname="FNAME">...</funcall>
1846 public Term (Domain domain, Symbol fname, Term[] args)
1847 : this (domain, fname, Qnull, args) { }
1849 // <funcall fname="FNAME" vname="VNAME">...</funcall>
1850 public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
1854 Function func = domain.GetFunc (fname);
1855 Variable vari = vname == Qnull ? null : domain.GetVar (vname, true);
1856 Funcall funcall = new Funcall (func, vari, args);
1857 if (func is Function.Macro)
1859 Term result = funcall.Eval (domain);
1860 intval = result.intval;
1861 objval = result.objval;
1867 public object Objval {
1870 throw new Exception ("term is an integer: " + this);
1878 throw new Exception ("term is not integer: " + this);
1883 public string Strval {
1886 throw new Exception ("term is not string: " + this);
1887 return (string) objval;
1891 public string Symval {
1894 throw new Exception ("term is not symbol: " + this);
1895 return (Symbol) objval;
1899 public List<Term> Listval {
1902 throw new Exception ("term is not list: " + this);
1903 return (List<Term>) objval;
1907 public bool IsTrue {
1909 return (objval == null
1911 : objval is List<Term>
1912 ? (((List<Term>) objval).Count != 0)
1916 public bool IsInt { get { return (objval == null); } }
1917 public bool IsStr { get { return (objval is string); } }
1918 public bool IsSymbol { get { return (objval is Symbol); } }
1919 public bool IsList { get { return (objval is List<Term>); } }
1921 public bool IsType (Type type)
1923 return (objval == null ? type == typeof (int)
1924 : type == objval.GetType ());
1927 public Term Eval (Domain domain)
1929 if (objval == null || objval is Symbol || objval is string)
1931 if (objval is List<Term>)
1932 return new Term ((List<Term>) objval);
1933 return ((TermValue) objval).Eval (domain);
1936 public Term Clone ()
1938 if (objval == null || objval is Symbol || objval is string)
1940 if (objval is List<Term>)
1942 List<Term> list = new List<Term> ();
1943 list.InsertRange (0, ((List<Term>) objval));
1944 return new Term (list);
1946 return new Term (((TermValue) objval).Clone ());
1949 public override string ToString ()
1954 str = "<integer>" + intval + "</integer>";
1955 else if (objval is Symbol)
1956 str = "<symbol>" + objval + "</symbol>";
1957 else if (objval is string)
1958 str = "<string>" + objval + "</string>";
1959 else if (objval is List<Term>)
1962 foreach (Term e in (List<Term>) objval)
1966 else if (objval is Term)
1967 str = "<quote>" + objval + "</quote>";
1968 else if (objval is TermValue)
1969 str = ((TermValue) objval).ToString ();
1971 throw new Exception ("invalid Term object: " + objval);
1976 static private Term Zero = new Term (0);
1977 static private Term One = new Term (1);
1978 static private Term TermInt = new Term (Qinteger);
1979 static private Term TermStr = new Term (Qstring);
1980 static private Term TermSymbol = new Term (Qsymbol);
1981 static private Term TermList = new Term (Qlist);
1982 static private Term TermTerm = new Term ((Symbol) "term");
1984 internal static int parse_integer (string str)
1986 int len = str.Length;
1987 bool negative = false;
1990 return (len == 0 ? 0 : str[0] - '0');
1997 if ((c == '0' || c == '#') && str[1] == 'x')
2000 for (int idx = 2; idx < len; idx++)
2006 i = i * 16 + (c - '0');
2010 i = i * 16 + (c - 'A');
2014 i = i * 16 + (c - 'a');
2023 for (int idx = 1; idx < len; idx++)
2026 if (c < '0' || c > '9')
2028 i = i * 10 + (c - '0');
2030 return negative ? - i : i;
2033 private Term[] terms;
2035 public static Term[] ParseTerms (Domain domain, XmlNode node)
2038 for (XmlNode n = node; n != null; n = n.NextSibling)
2039 if (n.NodeType == XmlNodeType.Element)
2041 if (n.Name == Qdefun)
2042 domain.Defun (n, true);
2043 else if (n.Name == Qdefmacro)
2044 domain.Defmacro (n, true);
2045 else if (n.Name == Qdefvar)
2050 Term[] terms = new Term[nterms];
2052 for (XmlNode n = node; n != null; n = n.NextSibling)
2053 if (n.NodeType == XmlNodeType.Element)
2055 if (n.Name == Qdefun)
2056 domain.Defun (n, false);
2057 else if (n.Name == Qdefmacro)
2058 domain.Defmacro (n, false);
2059 else if (n.Name != Qdefvar)
2060 terms[i++]= new Term (domain, n);
2065 public static Term Eval (Domain domain, Term[] terms)
2067 Term result = new Term (0);
2068 foreach (Term term in terms)
2071 if (result.Objval is Funcall)
2072 while ((result = result.Eval (domain)).Objval is Funcall);
2078 public Xexpression (Domain domain, XmlNode node)
2080 terms = ParseTerms (domain, node);
2083 public Xexpression (Domain domain, string url)
2085 XmlDocument doc = new XmlDocument (Symbol.NameTable);
2088 using (XmlTextReader reader = new XmlTextReader (url, doc.NameTable))
2092 } while (reader.NodeType != XmlNodeType.None
2093 && (reader.NodeType != XmlNodeType.Element
2094 || reader.Name != Qexpr));
2095 if (reader.NodeType == XmlNodeType.None)
2096 throw new Exception ("Node <expr> not found");
2097 node = doc.ReadNode (reader);
2099 terms = ParseTerms (domain, node.FirstChild);
2102 public Term Eval (Domain domain)
2108 domain.Catch (CatchTag.Return);
2109 foreach (Term term in terms)
2111 result = term.Eval (domain);
2121 public override string ToString ()
2124 for (int i = 0; i < terms.Length; i++)