2 using System.Collections;
3 using System.Collections.Generic;
5 using System.Reflection;
10 public static class Xexpression
12 private static int trace_depth = 0;
14 public static int TraceDepth {
15 get { return trace_depth; }
16 set { trace_depth = value; }
19 public static partial class Error
22 public static Symbol UnknownFunction = "unknown-function";
23 public static Symbol TypeConflict = "type-conflict";
24 public static Symbol AlreadyDefined = "already-defined";
25 public static Symbol WrongCallingFormat = "wrong-calling-format";
26 public static Symbol ArgumentMismatch = "argument-mismatch";
29 public static Symbol ArithmeticError = "arithmetic-error";
30 public static Symbol WrongType = "wrong-type";
31 public static Symbol WrongRange = "wrong-range";
32 public static Symbol OutOfRange = "out-of-range";
34 public static Symbol InvalidVariableType = "invalid variable type";
35 public static Symbol NoOuterLoop = "no outer loop";
36 public static Symbol UnknownError = "unknown error";
39 public class Exception : System.Exception
41 public Symbol ErrorName;
42 public string ErrorNode;
43 public Term ErrorTerm;
45 internal Exception (Symbol name, string fmt, params object[] args)
46 : this (name, Zero, fmt, args) { }
48 internal Exception (Symbol name, XmlNode node,
49 string fmt, params object[] args)
50 : this (name, node, Zero, fmt, args) { }
52 internal Exception (Symbol name, Term term,
53 string fmt, params object[] args)
54 : this (name, null, term, fmt, args) { }
56 internal Exception (Symbol name, XmlNode node, Term term,
57 string fmt, params object[] args)
58 : base (String.Format (message, args))
62 ErrorNode = node.OuterXml;
66 internal Exception (XmlNode node, System.Exception e)
67 : base ("System error", e)
69 ErrorName = Qsystem_error;
75 public struct Symbol : IEquatable<Symbol>
77 private static NameTable nt = new NameTable ();
81 public Symbol (string str) { name = nt.Add (str); }
83 public static implicit operator Symbol (string str)
85 return new Symbol (str);
88 public static implicit operator string (Symbol sym) { return sym.name; }
90 public static bool operator== (Symbol n1, Symbol n2)
92 return (object) n1.name == (object) n2.name;
95 public static bool operator!= (Symbol n1, Symbol n2)
97 return (object) n1.name != (object) n2.name;
100 public static bool operator== (Symbol n1, string n2)
102 return (object) n1.name == (object) n2;
105 public static bool operator!= (Symbol n1, string n2)
107 return (object) n1.name != (object) n2;
110 public static bool operator== (string n1, Symbol n2)
112 return (object) n1 == (object) n2.name;
115 public static bool operator!= (string n1, Symbol n2)
117 return (object) n1 != (object) n2.name;
120 public bool Equals (Symbol name)
122 return Object.ReferenceEquals (this.name, name.name);
125 public override bool Equals (object obj)
127 return (obj is Symbol ? this == (Symbol) obj
128 : obj is string ? this.name == (string) obj
132 public override int GetHashCode ()
134 return name.GetHashCode ();
137 public static NameTable NameTable { get { return nt; } }
139 public override string ToString () { return name; }
142 private static Symbol Qexpr = "expr";
144 private static Symbol Qnull = "";
145 private static Symbol Qfuncall = "funcall";
146 private static Symbol Qinteger = "integer";
147 private static Symbol Qstring = "string";
148 private static Symbol Qsymbol = "symbol";
149 private static Symbol Qlist = "list";
151 public static Symbol Qdefun = "defun";
152 public static Symbol Qdefmacro = "defmacro";
153 private static Symbol Qfname = "fname";
154 private static Symbol Qargs = "args";
155 private static Symbol Qfixed = "fixed";
156 private static Symbol Qoptional = "optional";
157 private static Symbol Qrest = "rest";
159 public static Symbol Qdefvar = "defvar";
160 private static Symbol Qvname = "vname";
161 private static Symbol Qdescription = "description";
162 private static Symbol Qrange = "range";
164 private static Symbol Qename = "ename";
166 public abstract class Function
169 // True iff the function can be called with vname="VNAME" attribute.
170 internal readonly bool with_var;
171 // Minimum number of positional arguments.
172 internal readonly int min_args;
173 // If non-nengative, maximum number of arguments. If negative,
174 // maxinum number of positional arguments is (-1 - max_args),
175 // and the remaining unlimit number of arguments are given as a
177 internal readonly int max_args;
179 public Function () { }
181 public Function (Symbol name, bool with_var, int min_args, int max_args)
184 this.with_var = with_var;
185 this.min_args = min_args;
186 this.max_args = max_args;
189 public abstract Term Call (Domain domain, Variable vari, Term[] args);
191 public override string ToString ()
196 internal class Subroutine : Function
198 public Func<Domain, Variable, Term[], Term> builtin;
200 public Subroutine (Func<Domain, Variable, Term[], Term> builtin,
201 Symbol name, bool with_var,
202 int min_args, int max_args)
203 : base (name, with_var, min_args, max_args)
205 this.builtin = builtin;
208 public override Term Call (Domain domain, Variable vari, Term[] args)
212 args = (Term[]) args.Clone ();
213 for (int i = 0; i < args.Length; i++)
215 args[i] = args[i].Eval (domain);
216 if (domain.Thrown ())
220 return builtin (domain, vari, args);
224 internal class SpecialForm : Function
226 public Func<Domain, Variable, Term[], Term> builtin;
228 public SpecialForm (Func<Domain, Variable, Term[], Term> builtin,
229 Symbol name, bool with_var,
230 int min_args, int max_args)
231 : base (name, with_var, min_args, max_args)
233 this.builtin = builtin;
236 public override Term Call (Domain domain, Variable vari, Term[] args)
238 return builtin (domain, vari, args);
242 internal class Lambda : Function
244 private Variable[] args;
247 public Lambda (Symbol name, int min_args, int max_args, Variable[] args,
249 : base (name, false, min_args, max_args)
255 public void SetBody (Term[] body)
260 public override Term Call (Domain domain, Variable vari, Term[] args)
262 Bindings current = domain.bindings;
264 int limit = max_args >= 0 ? args.Length : args.Length - 1;
266 for (int i = 0; i < limit; i++)
268 result = args[i].Eval (domain);
271 domain.Bind (this.args[i], result);
275 List<Term> list = new List<Term> ();
276 list.InsertRange (0, args[result].Listval);
278 for (int i = 0; i < list.Count; i++)
280 result = list[i].Eval (domain);
285 domain.Bind (this.args[limit], new Term (list));
287 domain.Catch (CatchTag.Return);
288 foreach (Term term in body)
290 result = term.Eval (domain);
291 if (domain.Thrown ())
295 domain.UnboundTo (current);
300 internal class Macro : Function
302 private Variable[] args;
305 public Macro (Symbol name, int min_args, int max_args, Variable[] args,
307 : base (name, false, min_args, max_args)
313 public void SetBody (Term[] body)
318 public override Term Call (Domain domain, Variable vari, Term[] args)
320 Bindings current = domain.bindings;
323 for (int i = 0; i < args.Length; i++)
324 domain.Bind (this.args[i], args[i]);
325 domain.Catch (CatchTag.Return);
326 foreach (Term term in body)
328 result = term.Eval (domain);
329 if (domain.Thrown ())
333 domain.UnboundTo (current);
339 public class Variable
341 public Domain domain;
342 public readonly Symbol name;
345 public Variable (Domain domain, Symbol name, Term val)
347 this.domain = domain;
352 public virtual bool ValueP (Term val) { return true; }
354 public virtual Variable Clone (Domain domain)
356 return new Variable (domain, name, val);
359 public virtual void Reset () { val = Zero; }
365 if (! ValueP (value))
366 throw new Exception ("Invalid value: " + value);
371 public Term SetValue (int i)
378 public Term SetValue (string s)
384 public override string ToString () { return name + "(" + val + ")"; }
386 public abstract class Typed : Variable
388 protected string desc;
389 private Term default_val;
391 protected Typed (Domain domain, Symbol name, Term val, string desc)
392 : base (domain, name, val)
398 public override void Reset () { val = default_val; }
400 public string Description {
402 set { desc = value; }
406 public class Int : Typed
410 public bool IsSubrange (int[] r)
414 for (int i = 0; i < r.Length; i += 2)
417 for (j = 0; j < range.Length; j += 2)
418 if (range[j] <= r[i] && range[j + 1] >= r[i + 1])
420 if (j >= range.Length)
426 public Int (Domain domain, Symbol name, int n, string desc, int[] range)
427 : base (domain, name, new Term (n), desc)
429 if (range != null && range.Length % 2 == 1)
430 throw new Exception (Qinvalid_range,
431 "Range length for {0} not even", name);
434 throw new Exception (Qout_of_range,
435 "Invalid integer value for {0}: {1}",
439 public override bool ValueP (Term term)
446 for (int i = 0; i < range.Length; i += 2)
447 if (range[i] <= n && range[i + 1] >= n)
452 public override Variable Clone (Domain domain)
454 return new Int (domain, name, val.Intval, desc, range);
457 public int[] Range { get { return range; } set { range = value; } }
460 public class Str : Typed
462 private string[] range;
464 public bool IsSubrange (string[] r)
468 for (int i = 0; i < r.Length; i++)
471 for (j = 0; j < range.Length; j++)
472 if (range[j] == r[i])
474 if (j >= range.Length)
480 public Str (Domain domain, Symbol name, string str, string desc,
482 : base (domain, name, new Term (str), desc)
486 throw new Exception (Qout_of_range,
487 "Invalid string value for {0}: {1}",
491 public override bool ValueP (Term term)
497 string str = term.Strval;
498 foreach (string s in range)
504 public override Variable Clone (Domain domain)
506 return new Str (domain, name, val.Strval, desc, range);
509 public string[] Range { get { return range; } set { range = value; } }
512 public class Sym : Typed
514 public Symbol[] range;
516 public bool IsSubrange (Symbol[] r)
520 for (int i = 0; i < r.Length; i++)
523 for (j = 0; j < range.Length; j++)
524 if (range[j] == r[i])
526 if (j >= range.Length)
532 public Sym (Domain domain, Symbol name, Symbol sym, string desc,
534 : base (domain, name, new Term (sym), desc)
538 throw new Exception (Qout_of_range,
539 "Invalid symbol value for {0}: {1}",
543 public override bool ValueP (Term term)
549 Symbol name = term.Symval;
550 foreach (Symbol n in range)
556 public override Variable Clone (Domain domain)
558 return new Sym (domain, name, val.Symval, desc, range);
561 public Symbol[] Range { get { return range; } set { range = value; } }
565 internal class Bindings
567 private Variable vari;
568 private Term old_value;
569 private Bindings next;
571 private Bindings (Variable vari)
574 old_value = vari.Value;
577 public static Bindings Bind (Bindings bindings, Variable vari, Term val)
579 Bindings b = new Bindings (vari);
586 internal Bindings UnboundTo (Bindings boundary)
588 for (Bindings b = this; b != boundary; b = b.next)
589 b.vari.Value = b.old_value;
593 public override string ToString ()
595 string str = "(bindings";
596 for (Bindings b = this; b != null; b = b.next)
597 str += " " + vari.name + "=" + b.old_value;
602 internal struct CatchTag
606 public CatchTag (Symbol sym) { tag = new Term (sym); }
607 public CatchTag (Symbol sym, string msg) { tag = new Term (sym, msg); }
608 public CatchTag (ErrorTerm e) { tag = new Term (e); }
609 private CatchTag (int i) { tag = new Term (i); }
611 public Term Tag { get { return tag; } }
613 public static CatchTag Return = new CatchTag (0);
614 public static CatchTag Break = new CatchTag (1);
620 public object context;
621 public int depth = 0;
622 private Stack<Term> call_stack = new Stack<Term> ();
624 internal Dictionary<Symbol, MethodInfo> termtypes
625 = new Dictionary<Symbol, MethodInfo> ();
626 internal Dictionary<Symbol, Function> functions
627 = new Dictionary<Symbol, Function> ();
628 internal Dictionary<Symbol, Function.Macro> macros
629 = new Dictionary<Symbol, Function.Macro> ();
630 internal Dictionary<Symbol, Variable> variables
631 = new Dictionary<Symbol, Variable> ();
632 internal Bindings bindings;
633 private Stack<CatchTag> catch_stack = new Stack<CatchTag> ();
634 private int catch_count = 0;
636 internal Domain (Symbol name) { this.name = name; }
638 public Domain (Symbol name, object context)
639 : this (name, basic, context) { }
641 public Domain (Symbol name, Domain parent, object context) : this (name)
643 termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
644 functions = new Dictionary<Symbol, Function> (parent.functions);
645 macros = new Dictionary<Symbol, Function.Macro> (parent.macros);
646 variables = new Dictionary<Symbol, Variable> (parent.variables);
647 this.context = context;
650 public int CallStackCount { get { return call_stack.Count; } }
652 public void CallStackPush (Term term)
654 call_stack.Push (term);
657 public void CallStackPop ()
662 public void CallStackPop (int count)
664 while (count < call_stack.Count)
668 internal void Bind (Variable vari, Term value)
670 bindings = Bindings.Bind (bindings, vari, value);
673 internal void UnboundTo (Bindings boundary)
675 if (bindings != null)
676 bindings = bindings.UnboundTo (boundary);
679 internal void Catch (CatchTag tag)
681 catch_stack.Push (tag);
685 internal void Uncatch ()
688 if (catch_count > catch_stack.Count)
692 public bool Thrown () { return catch_count < catch_stack.Count; }
694 public bool Thrown (out bool caught)
696 if (catch_count < catch_stack.Count)
698 caught = catch_count == catch_stack.Count - 1;
705 internal void ThrowReturn ()
707 foreach (CatchTag elt in catch_stack)
710 if (elt.Tag == CatchTag.Return.Tag)
715 internal bool ThrowBreak ()
717 if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
723 internal void ThrowSymbol (Term tag)
725 foreach (CatchTag elt in catch_stack)
728 if (elt.Tag.Matches (tag))
733 internal Term ThrowError (Term tag)
736 ErrorTerm e = tag.objval as ErrorTerm;
737 e.CallStack = call_stack.ToArray ();
739 foreach (CatchTag elt in catch_stack)
742 if (elt.Tag.Matches (tag))
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 || macros.ContainsKey (name))
760 throw new Exception ("already defined: " + name);
761 Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
762 MethodInfo minfo = type.GetMethod ("Parser", types);
763 if (minfo == null || minfo.ReturnType != typeof (TermValue))
764 throw new Exception ("No \"Parser\" method of correct type: " + type);
765 termtypes[name] = minfo;
768 static void check_func_head (Symbol name, bool with_var,
769 int min_args, int max_args)
771 if (termtypes.ContainsKey (name))
772 throw new Exception (Qtype_conflict, "{0} is a Term type", name);
773 else if (macros.ContainsKey (name))
774 throw new Exception (Qtype_conflict, "{0} is a macro", name);
777 if (functions.TryGetValue (name, out func)
778 && (func.with_var != with_var
779 || func.min_args != min_args
780 || func.max_args != max_args))
781 throw new Exception (Qargument_mismatch, "");
784 public void DefSubr (Func<Domain, Variable, Term[], Term> builtin,
785 Symbol name, bool with_var,
786 int min_args, int max_args)
788 check_func_head (name, with_var, min_args, max_args);
789 functions[name] = new Function.Subroutine (builtin, name, with_var,
793 public void DefSpecial (Func<Domain, Variable, Term[], Term> builtin,
794 Symbol name, bool with_var,
795 int min_args, int max_args)
797 check_func_head (name, with_var, min_args, max_args);
798 functions[name] = new Function.SpecialForm (builtin, name, with_var,
802 public void Defun (Symbol name, int min_arg, int max_arg,
803 Variable[] args, Term[] body)
805 check_func_head (name, false, min_args, max_args);
806 functions[name] = new Function.Lambda (name, min_args, max_args,
810 public void Defun (Function func)
812 functions[func.name] = func;
815 public void Defmacro (Symbol name, int min_arg, int max_arg,
816 Variable[] args, Term[] body)
818 if (termtypes.ContainsKey (name))
819 throw new Exception (Qtype_conflict, "{0} is a Term type", name);
820 else if (function.ContainsKey (name))
821 throw new Exception (Qtype_conflict, "{0} is a function", name);
823 Function.Macro macro;
824 if (macros.TryGetValue (name, out macro)
825 && (macro.min_args != min_args
826 || macro.max_args != max_args))
827 throw new Exception (Qargument_mismatch, "");
829 macros[name] = new Function.Macro (name, min_arg, max_arg, args, body);
832 public void DefAlias (Symbol alias, Symbol fname)
835 if (functions.TryGetValue (alias, out func))
836 throw new Exception (Qalready_defined,
837 "Alread defined: {0}", alias);
838 if (! functions.TryGetValue (fname, out func))
839 throw new Exception (Qunknown_function,
840 "Unknown fucntion: {0}", fname);
841 functions[alias] = func;
844 public Variable Defvar (XmlNode node)
846 Symbol name = node.Attributes[0].Value;
850 node = node.FirstChild;
851 if (node != null && node.Name == Qdescription)
853 desc = node.InnerText;
854 node = node.NextSibling;
860 Symbol type = node.Name;
861 XmlNodeList range_list = null;
863 XmlNode n = node.NextSibling;
867 range_list = n.ChildNodes;
868 nranges = range_list.Count;
871 if (type == Qinteger)
873 int val = parse_integer (node);
875 if (range_list != null)
877 range = new int[nranges * 2];
878 for (int i = 0; i < nranges; i++)
880 XmlNode nd = range_list[i];
881 if (nd.Name == Qrange)
883 range[i * 2] = parse_integer (nd.FirstChild);
884 range[i * 2 + 1] = parse_integer (nd.LastChild);
888 range[i * 2] = range[i * 2 + 1]
889 = parse_integer (nd.FirstChild);
893 vari = DefvarInt (name, val, desc, range);
895 else if (type == Qstring)
897 string[] range = null;
898 if (range_list != null)
900 range = new string[nranges];
901 for (int i = 0; i < nranges; i++)
902 range[i] = range_list[i].FirstChild.InnerText;
904 vari = DefvarStr (name, node.InnerText, desc, range);
906 else if (type == Qsymbol)
908 Symbol[] range = null;
909 if (range_list != null)
911 range = new Symbol[nranges];
912 for (int i = 0; i < nranges; i++)
913 range[i] = range_list[i].FirstChild.InnerText;
915 vari = DefvarSym (name, (Symbol) node.InnerText, desc, range);
918 Exception.Throw (Qparse_error, node, "Unknown type: {0}", type);
922 if (variables.TryGetValue (name, out vari))
923 vari = vari.Clone (this);
925 vari = new Variable (this, name, Zero);
926 variables[name] = vari;
931 public Variable Defvar (Variable vari)
933 vari = vari.Clone (this);
934 variables[vari.name] = vari;
938 internal Variable Defvar (Symbol name)
940 Variable vari = new Variable (this, name, Zero);
941 variables[name] = vari;
945 public Variable DefvarInt (Symbol name, int n, string desc, int[] range)
949 if (variables.TryGetValue (name, out vari))
951 Variable.Int intvari = vari as Variable.Int;
953 throw new Exception ("Variable type mismatch: " + name);
956 if (! intvari.IsSubrange (range))
957 throw new Exception ("Variable range mismatch: " + name);
958 intvari.Range = range;;
961 intvari.Description = desc;
965 vari = new Variable.Int (this, name, n, desc, range);
966 variables[name] = vari;
971 public Variable DefvarStr (Symbol name, string str, string desc,
976 if (variables.TryGetValue (name, out vari))
978 Variable.Str strvari = vari as Variable.Str;
980 throw new Exception ("Variable type mismatch: " + name);
983 if (! strvari.IsSubrange (range))
984 throw new Exception ("Variable range mismatch: " + name);
985 strvari.Range = range;
988 strvari.Description = desc;
992 vari = new Variable.Str (this, name, str, desc, range);
993 variables[name] = vari;
998 public Variable DefvarSym (Symbol name, Symbol sym, string desc,
1003 if (variables.TryGetValue (name, out vari))
1005 Variable.Sym symvari = vari as Variable.Sym;
1006 if (symvari == null)
1007 throw new Exception ("Variable type mismatch: " + name);
1010 if (! symvari.IsSubrange (range))
1011 throw new Exception ("Variable range mismatch: " + name);
1012 symvari.Range = range;
1015 symvari.Description = desc;
1019 vari = new Variable.Sym (this, name, sym, desc, range);
1020 variables[name] = vari;
1025 internal Function GetFunc (Symbol name)
1029 if (! functions.TryGetValue (name, out func))
1030 throw new Exception (Qunknown_function, (strign) name);
1034 public bool CopyFunc (Domain domain, Symbol name)
1036 Function func = GetFunc (name);
1038 domain.functions[name] = func;
1042 public void CopyFunc (Domain domain)
1044 foreach (KeyValuePair<Symbol, Function> kv in functions)
1045 domain.functions[kv.Key] = kv.Value;
1048 public Variable GetVar (Symbol name, bool create)
1052 if (! variables.TryGetValue (name, out vari))
1056 variables[name] = vari = new Variable (this, name, Zero);
1061 public override string ToString ()
1063 string str = "<(functions";
1064 foreach (KeyValuePair<Symbol, Function> kv in functions)
1065 str += " " + kv.Key;
1066 str += ") (variabls";
1067 foreach (KeyValuePair<Symbol, Variable> kv in variables)
1068 str += " " + kv.Value;
1070 if (bindings != null)
1071 str += " " + bindings;
1072 if (context != null)
1073 str += " (" + context + ")";
1078 internal void TraceWrite (string fmt, params string[] arg)
1080 if (trace_depth > depth)
1082 for (int i = 0; i < depth; i++)
1083 Console.Write (" ");
1084 Console.WriteLine (fmt, arg);
1088 public object SaveValues ()
1090 Dictionary<Variable,Term> values = new Dictionary<Variable,Term> ();
1092 foreach (KeyValuePair<Symbol,Variable> kv in variables)
1093 values[kv.Value] = kv.Value.Value.Clone ();
1097 public void RestoreValues (object values)
1099 foreach (KeyValuePair<Variable,Term> kv
1100 in (Dictionary<Variable,Term>) values)
1101 kv.Key.Value = kv.Value;
1105 private static Domain basic = new Domain ("basic");
1107 static Xexpression ()
1109 basic.DefType (typeof (Varref));
1110 basic.DefType (typeof (Funcall));
1111 basic.DefType (typeof (ErrorTerm));
1113 basic.DefSubr (Fset, "set", true, 1, 1);
1114 basic.DefAlias ("=", "set");
1115 basic.DefSubr (Fnot, "not", false, 1, 1);
1116 basic.DefAlias ("!", "not");
1117 basic.DefSubr (Fadd, "add", true, 1, -1);
1118 basic.DefAlias ("+", "add");
1119 basic.DefSubr (Fmul, "mul", true, 1, -1);
1120 basic.DefAlias ("*", "mul");
1121 basic.DefSubr (Fsub, "sub", true, 1, -1);
1122 basic.DefAlias ("-", "sub");
1123 basic.DefSubr (Fdiv, "div", true, 1, -1);
1124 basic.DefAlias ("/", "div");
1125 basic.DefSubr (Fmod, "mod", true, 1, 2);
1126 basic.DefAlias ("%", "mod");
1127 basic.DefSubr (Flogior, "logior", true, 1, -1);
1128 basic.DefAlias ("|", "logior");
1129 basic.DefSubr (Flogand, "logand", true, 1, -1);
1130 basic.DefAlias ("&", "logand");
1131 basic.DefSubr (Flsh, "lsh", true, 1, 2);
1132 basic.DefAlias ("<<", "lsh");
1133 basic.DefSubr (Frsh, "rsh", true, 1, 2);
1134 basic.DefAlias (">>", "rsh");
1135 basic.DefSubr (Feq, "eq", false, 2, -1);
1136 basic.DefAlias ("==", "eq");
1137 basic.DefSubr (Fnoteq, "noteq", false, 2, 2);
1138 basic.DefAlias ("!=", "noteq");
1139 basic.DefSubr (Flt, "lt", false, 2, -1);
1140 basic.DefAlias ("<", "lt");
1141 basic.DefSubr (Fle, "le", false, 2, -1);
1142 basic.DefAlias ("<=", "le");
1143 basic.DefSubr (Fgt, "gt", false, 2, -1);
1144 basic.DefAlias (">", "gt");
1145 basic.DefSubr (Fge, "ge", false, 2, -1);
1146 basic.DefAlias (">=", "ge");
1148 basic.DefSubr (Fappend, "append", true, 0, -1);
1149 basic.DefSubr (Fconcat, "concat", true, 0, -1);
1150 basic.DefSubr (Fnth, "nth", false, 2, 2);
1151 basic.DefSubr (Fcopy, "copy", false, 1, 1);
1152 basic.DefSubr (Fins, "ins", true, 2, 2);
1153 basic.DefSubr (Fdel, "del", true, 2, 2);
1154 basic.DefSubr (Feval, "eval", false, 1, 1);
1155 basic.DefSubr (Fbreak, "break", false, 0, 1);
1156 basic.DefSubr (Freturn, "return", false, 0, 1);
1157 basic.DefSubr (Fthrow, "throw", false, 1, 2);
1159 basic.DefSpecial (Fand, "and", false, 1, -1);
1160 basic.DefAlias ("&&", "and");
1161 basic.DefSpecial (For, "or", false, 1, -1);
1162 basic.DefAlias ("||", "or");
1163 basic.DefSpecial (Fprogn, "progn", false, 0, -1);
1164 basic.DefAlias ("expr", "progn");
1165 basic.DefSpecial (Fif, "if", false, 2, 3);
1166 basic.DefSpecial (Fwhen, "when", false, 1, -1);
1167 basic.DefSpecial (Floop, "loop", false, 1, -1);
1168 basic.DefSpecial (Fwhile, "while", false, 1, -1);
1169 basic.DefSpecial (Fcond, "cond", false, 1, -1);
1170 basic.DefSpecial (Fforeach, "foreach", true, 2, -1);
1171 basic.DefSpecial (Fquote, "quote", false, 1, 1);
1172 basic.DefSpecial (Ftype, "type", false, 1, 1);
1173 basic.DefSpecial (Fcatch, "catch", true, 2, -1);
1176 private static Term Fset (Domain domain, Variable vari, Term[] args)
1179 return new Term (new ErrorTerm (Error.NoVariable, ""));
1180 vari.Value = args[0];
1184 private static Term Fnot (Domain domain, Variable vari, Term[] args)
1186 return args[0].IsTrue ? Zero : One;
1189 private static Term Fadd (Domain domain, Variable vari, Term[] args)
1191 int n = vari == null ? 0 : vari.Value.Intval;
1193 foreach (Term arg in args)
1195 return (vari == null ? new Term (n) : vari.SetValue (n));
1198 private static Term Fmul (Domain domain, Variable vari, Term[] args)
1200 int n = vari == null ? 1 : vari.Value.Intval;
1201 foreach (Term arg in args)
1203 return (vari == null ? new Term (n) : vari.SetValue (n));
1206 private static Term Fsub (Domain domain, Variable vari, Term[] args)
1217 n = vari.Value.Intval;
1220 while (i < args.Length)
1221 n -= args[i++].Intval;
1222 return (vari == null ? new Term (n) : vari.SetValue (n));
1225 private static Term Fdiv (Domain domain, Variable vari, Term[] args)
1236 n = vari.Value.Intval;
1239 while (i < args.Length)
1240 n /= args[i++].Intval;
1241 return (vari == null ? new Term (n) : vari.SetValue (n));
1244 private static Term Fmod (Domain domain, Variable vari, Term[] args)
1246 int n = args[0].Intval % args[1].Intval;
1248 return (vari == null ? new Term (n) : vari.SetValue (n));
1251 private static Term Flogior (Domain domain, Variable vari, Term[] args)
1253 int n = vari == null ? 0 : vari.Value.Intval;
1254 foreach (Term arg in args)
1256 return (vari == null ? new Term (n) : vari.SetValue (n));
1259 private static Term Flogand (Domain domain, Variable vari, Term[] args)
1270 n = vari.Value.Intval;
1273 while (i < args.Length)
1274 n &= args[i++].Intval;
1275 return (vari == null ? new Term (n) : vari.SetValue (n));
1278 private static Term Flsh (Domain domain, Variable vari, Term[] args)
1280 int n = args[0].Intval << args[1].Intval;
1281 return (vari == null ? new Term (n) : vari.SetValue (n));
1284 private static Term Frsh (Domain domain, Variable vari, Term[] args)
1286 int n = args[0].Intval >> args[1].Intval;
1287 return (vari == null ? new Term (n) : vari.SetValue (n));
1290 private static Term Feq (Domain domain, Variable vari, Term[] args)
1294 if (o.objval == null)
1296 for (int i = 1; i < args.Length; i++)
1297 if (args[i].objval != null || args[i].intval != o.intval)
1302 for (int i = 1; i < args.Length; i++)
1303 if (o.objval.Equals (args[i].objval))
1309 private static Term Fnoteq (Domain domain, Variable vari, Term[] args)
1311 return Feq (domain, vari, args);
1314 private static Term Flt (Domain domain, Variable vari, Term[] args)
1316 int n = args[0].Intval;
1318 for (int i = 1; i < args.Length; i++)
1320 int n1 = args[i].Intval;
1328 private static Term Fle (Domain domain, Variable vari, Term[] args)
1330 int n = args[0].Intval;
1331 for (int i = 1; i < args.Length; i++)
1333 int n1 = args[i].Intval;
1341 private static Term Fgt (Domain domain, Variable vari, Term[] args)
1343 int n = args[0].Intval;
1344 for (int i = 1; i < args.Length; i++)
1346 int n1 = args[i].Intval;
1354 private static Term Fge (Domain domain, Variable vari, Term[] args)
1356 int n = args[0].Intval;
1357 for (int i = 1; i < args.Length; i++)
1359 int n1 = args[i].Intval;
1367 private static Term Fappend (Domain domain, Variable vari, Term[] args)
1372 list = new List<Term> ();
1374 list = vari.Value.Listval;
1376 foreach (Term arg in args)
1379 list.AddRange ((List<Term>) arg.objval);
1387 result.objval = list;
1393 private static Term Fconcat (Domain domain, Variable vari, Term[] args)
1400 str = vari.Value.Strval;
1402 foreach (Term arg in args)
1405 str += (string) arg.objval;
1406 else if (arg.IsList)
1407 foreach (Term term in (List<Term>) arg.objval)
1408 str += (char) term.Intval;
1410 str += (char) arg.Intval;
1420 return vari.SetValue (str);
1423 private static Term Fnth (Domain domain, Variable vari, Term[] args)
1429 result.intval = ((string) args[1].objval)[args[0].Intval];
1430 result.objval = null;
1432 else if (args[1].IsList)
1434 result = ((List<Term>) args[1].objval)[args[0].Intval];
1437 throw new Exception (Qwrong_type,
1438 "{0} is not a string nor a list", args[1]);
1442 private static Term Fcopy (Domain domain, Variable vari, Term[] args)
1447 result.objval = new List<Term> (args[0].Listval);
1451 private static Term Fins (Domain domain, Variable vari, Term[] args)
1454 throw new Exception (Qwrong_calling_format, "No vname attribute");
1455 Term term = vari.Value;
1458 string str = term.Strval.Insert (args[0].Intval, args[1].Strval);
1459 vari.SetValue (str);
1461 else if (vari.Value.IsList)
1462 vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval);
1464 throw new Exception (Qwrong_type, "{0} is not a string nor list",
1469 private static Term Fdel (Domain domain, Variable vari, Term[] args)
1472 throw new Exception (Qwrong_calling_format, "No vname attribute");
1473 if (vari.Value.IsStr)
1476 = vari.Value.Strval.Remove (args[0].Intval,
1477 args[1].Intval - args[0].Intval);
1478 vari.SetValue (str);
1480 else if (vari.Value.IsList)
1481 vari.Value.Listval.RemoveRange (args[0].Intval,
1482 args[1].Intval - args[0].Intval);
1484 throw new Exception (Qwrong_type, "{0} is not a string nor a list",
1489 private static Term Fand (Domain domain, Variable vari, Term[] args)
1491 foreach (Term arg in args)
1492 if (! arg.Eval (domain).IsTrue)
1497 private static Term For (Domain domain, Variable vari, Term[] args)
1499 foreach (Term arg in args)
1500 if (arg.Eval (domain).IsTrue)
1505 private static Term Feval (Domain domain, Variable vari, Term[] args)
1507 return (args[0].Eval (domain));
1510 private static Term Fprogn (Domain domain, Variable vari, Term[] args)
1514 foreach (Term arg in args)
1515 result = arg.Eval (domain);
1519 private static Term Fif (Domain domain, Variable vari, Term[] args)
1521 if (args[0].Eval (domain).IsTrue)
1522 return args[1].Eval (domain);
1523 if (args.Length == 2)
1525 return args[2].Eval (domain);
1528 private static Term Fwhen (Domain domain, Variable vari, Term[] args)
1530 if (! args[0].Eval (domain).IsTrue)
1533 for (int i = 1; i < args.Length; i++)
1534 result = args[i].Eval (domain);
1538 private static Term Freturn (Domain domain, Variable vari, Term[] args)
1540 domain.ThrowReturn ();
1541 return args.Length == 0 ? Zero : args[0];
1544 private static Term Fbreak (Domain domain, Variable vari, Term[] args)
1546 if (! domain.ThrowBreak ())
1547 return domain.ThrowError (new Term (Error.NoOuterLoop, null));
1548 return args.Length == 0 ? Zero : args[0];
1551 private static Term Floop (Domain domain, Variable vari, Term[] args)
1555 domain.Catch (CatchTag.Break);
1556 while (! domain.Thrown ())
1557 foreach (Term arg in args)
1559 result = arg.Eval (domain);
1560 if (domain.Thrown ())
1569 private static Term Fwhile (Domain domain, Variable vari, Term[] args)
1573 domain.Catch (CatchTag.Break);
1574 while (! domain.Thrown () && args[0].Eval (domain).IsTrue)
1575 for (int i = 1; i < args.Length; i++)
1577 result = args[i].Eval (domain);
1578 if (domain.Thrown ())
1587 private static Term Fcond (Domain domain, Variable vari, Term[] args)
1589 foreach (Term arg in args)
1591 List<Term> list = arg.Listval;
1592 Term result = list[0].Eval (domain);
1596 for (int i = 1; i < list.Count; i++)
1599 result = list[i].Eval (domain);
1601 if (domain.Thrown ())
1610 private static Term Fforeach (Domain domain, Variable vari, Term[] args)
1612 Term result = args[0].Eval (domain);
1613 if (domain.Thrown ())
1615 List<Term> list = result.Listval;
1616 Bindings current = domain.bindings;
1619 domain.Catch (CatchTag.Break);
1620 foreach (Term term in list)
1622 domain.Bind (vari, term);
1624 for (int i = 1; i < args.Length; i++)
1626 result = args[i].Eval (domain);
1627 if (domain.Thrown ())
1631 domain.UnboundTo (current);
1640 private static Term Fquote (Domain domain, Variable vari, Term[] args)
1645 private static Term Ftype (Domain domain, Variable vari, Term[] args)
1651 if (args[0].IsSymbol)
1658 private static Term eval_terms (Domain domain, Term[] terms, int idx,
1664 for (int i = idx; i < args.Length; i++)
1666 result = args[i].Eval (domain);
1667 if (domain.Thrown (out caught))
1673 public static Term Fcatch (Domain domain, Variable vari, Term[] args)
1676 bool caught = false;
1678 if (args.Length < 2)
1679 throw new Exception (Error.WrongCallingFormat,
1680 "too fee arguments: {0}", args.Length);
1681 if (args[0].IsError)
1683 int count = domain.CallStackCount;
1686 result = evaluate_terms (domain, args, 1, out caught);
1687 } catch (Exception e) {
1688 if (! args[0].Matches (e.ErrorTerm))
1690 ((ErrorTerm) e.ErrorTerm.objval).
1692 vari.Value = e.ErrorTerm;
1693 domain.CallStackPop (count);
1697 else if (args[0].IsSymbol)
1699 domain.Catch (new CatchTag (args[0].Symval));
1700 result = evaluate_terms (domain, args, 1, out caught);
1704 vari.Value = result;
1708 public static Term Fthrow (Domain domain, Variable vari, Term[] args)
1710 if (args[0].IsSymbol)
1712 domain.ThrowSymbol (args[0]);
1713 return (args[args.Length - 1]);
1715 if (args[0].IsError)
1716 return domain.ThrowError (args[0]);
1717 return domain.ThrowError (new Term (Error.InvalidArgumentType,
1718 args[0].ToString ()));
1721 public abstract class TermValue
1723 public virtual Term Eval (Domain domain) { return this; }
1724 public virtual TermValue Clone () { return this; }
1725 public virtual bool IsTrue { get { return true; } }
1726 public virtual bool Matches (TermValue other) { return Equals (other); }
1727 public override abstract bool Equals (object obj);
1728 public override abstract int GetHashCode ();
1729 public abstract string ToString (bool detail);
1732 private class Varref : TermValue
1734 private static Symbol name = "varref";
1735 public static Symbol Name { get { return name; } }
1737 private Symbol vname;
1738 private Variable vari;
1740 public Varref (Symbol vname) { this.vname = vname; }
1742 public override Term Eval (Domain domain)
1744 if (vari == null || vari.domain != domain)
1745 vari = domain.GetVar (vname, true);
1749 public static TermValue Parser (Domain domain, XmlNode node)
1751 return new Varref ((Symbol) node.Attributes[Qvname].Value);
1754 public override bool Equals (object obj)
1756 Varref varref = obj as Varref;
1757 return (varref != null && varref.vari.name == vari.name);
1760 public override int GetHashCode ()
1762 return vari.name.GetHashCode ();
1765 public override string ToString () { return ToString (true); }
1767 public override string ToString (bool detail)
1769 return "<varref vname=\"" + vname + "\"/>";
1773 private class Funcall : TermValue
1775 private static Symbol name = "funcall";
1776 public static Symbol Name { get { return name; } }
1778 internal Function func;
1779 internal Variable vari;
1780 internal Term[] args;
1782 public Funcall (Function func, Variable vari, Term[] args)
1784 int nargs = args.Length;
1786 if (nargs < func.min_args
1787 || (func.max_args >= 0 && nargs > func.max_args))
1788 throw new Exception (Qwrong_calling_format,
1789 "Wrong number of arguments to {0}: {1}",
1791 if (! func.with_var && vari != null)
1792 throw new Exception (Qwrong_calling_format,
1793 "Wrong vname attribute to {0}: {1}",
1794 func.name, vari.name);
1800 public static TermValue Parser (Domain domain, XmlNode node)
1802 Symbol fname = node.Name;
1805 if (fname == Qfuncall)
1806 fname = node.Attributes[Qfname].Value;
1807 Function func = domain.GetFunc (fname);
1809 attr = node.Attributes[Qvname];
1810 vari = attr == null ? null : domain.GetVar (attr.Value, true);
1811 XmlNodeList nlist = node.ChildNodes;
1812 int nargs = nlist.Count;
1813 Term[] args = new Term[nargs];
1814 for (int i = 0; i < nargs; i++)
1815 args[i] = new Term (domain, nlist[i]);
1816 return new Funcall (func, vari, args);
1819 public override Term Eval (Domain domain)
1821 domain.TraceWrite (ToString ());
1823 Term result = func.Call (domain, vari, args);
1825 domain.TraceWrite ("=> {0}", result.ToString ());
1829 public override TermValue Clone ()
1831 return new Funcall (func, vari, args);
1834 public override bool Equals (object obj)
1836 Funcall funcall = obj as Funcall;
1838 && funcall.func == func
1839 && funcall.vari == vari
1840 && funcall.args.Length == args.Length);
1843 public override int GetHashCode ()
1845 return func.GetHashCode () ^ args.Length;
1848 public override string ToString () { return ToString (true); }
1850 public override string ToString (bool detail)
1852 string str = "<" + func.name;
1854 str += " vname=\"" + vari.name + "\"";
1855 if (args.Length == 0 || ! detail)
1858 if (func is Function.SpecialForm)
1860 for (int i = 0; i < args.Length; i++)
1864 foreach (Term e in args)
1866 return (str + "</" + func.name + ">");
1870 internal class ErrorTerm : TermValue
1872 private static Symbol name = "error";
1873 public static Symbol Name { get { return name; } }
1875 private readonly Symbol ename;
1876 private string message;
1877 private Term[] stack;
1879 public ErrorTerm (Symbol ename, string message)
1882 this.message = message;
1885 public static TermValue Parser (Domain domain, XmlNode node)
1887 XmlAttribute attr = node.Attributes[Qename];
1888 Symbol ename = attr == null ? Qnull : (Symbol) attr.Value;
1889 string message = node.InnerText;
1890 return new ErrorTerm (ename, message);
1893 public Term[] CallStack { get { return stack; } set { stack = value; } }
1895 public override TermValue Clone ()
1897 return new ErrorTerm (ename, message);
1900 public override bool Equals (object obj)
1902 ErrorTerm e = obj as ErrorTerm;
1903 if (e == null || e.ename != ename || e.message != message
1904 || (e.stack == null ? stack != null
1905 : (stack == null || e.stack.Length != stack.Length)))
1908 for (int i = 0; i < stack.Length; i++)
1909 if (! stack[i].Equals (e.stack[i]))
1914 public override int GetHashCode ()
1916 return ename.GetHashCode ();
1919 public override bool Matches (TermValue term)
1921 ErrorTerm e = term as ErrorTerm;
1922 return (e != null && (ename == Qnull || e.ename == ename));
1925 public override string ToString () { return ToString (true); }
1927 public override string ToString (bool detail)
1929 string str = "<error type=\"" + ename + "\">";
1930 if (message != null)
1933 for (int i = 0; i < stack.Length; i++)
1934 str += stack[i].ToString (false);
1935 return str + "</error>";
1942 public object objval;
1944 // <integer>...</integer>
1945 public Term (int i) { intval = i; objval = null; }
1946 // <symbol>...</symbol>
1947 public Term (Symbol name) { intval = 0; objval = name; }
1948 // <string>...</string>
1949 public Term (string str) { intval = 0; objval = str; }
1951 public Term (List<Term> list) { intval = 0; objval = list; }
1952 // <error ename="ERROR-NAME">ERROR-MESSASGE</error>
1953 public Term (Symbol name, string message)
1956 objval = new ErrorTerm (name, message);
1959 public Term (TermValue obj) { intval = 0; objval = obj; }
1961 public Term (Domain domain, XmlNode node)
1963 Symbol name = node.Name;
1965 if (name == Qinteger)
1967 intval = parse_integer (node);
1973 if (name == Qsymbol)
1974 objval = (Symbol) node.InnerText;
1975 else if (name == Qstring)
1976 objval = node.InnerText.Clone ();
1977 else if (name == Qlist)
1979 List<Term> list = new List<Term> ();
1980 for (node = node.FirstChild; node != null;
1981 node = node.NextSibling)
1982 list.Add (new Term (domain, node));
1989 if (domain.termtypes.TryGetValue (name, out minfo))
1990 objval = (TermValue) minfo.Invoke (null, new Object[] { domain, node});
1993 Funcall funcall = (Funcall) Funcall.Parser (domain, node);
1994 if (funcall.func is Function.Macro)
1996 Term result = funcall.Eval (domain);
1997 intval = result.intval;
1998 objval = result.objval;
2007 // <varref vname="VNAME"/>
2008 public Term (Domain domain, Symbol vname)
2011 objval = new Varref (vname);
2014 // <funcall fname="FNAME">...</funcall>
2015 public Term (Domain domain, Symbol fname, Term[] args)
2016 : this (domain, fname, Qnull, args) { }
2018 // <funcall fname="FNAME" vname="VNAME">...</funcall>
2019 public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
2023 Function func = domain.GetFunc (fname);
2024 Variable vari = vname == Qnull ? null : domain.GetVar (vname, true);
2025 Funcall funcall = new Funcall (func, vari, args);
2026 if (func is Function.Macro)
2028 Term result = funcall.Eval (domain);
2029 intval = result.intval;
2030 objval = result.objval;
2036 public object Objval {
2039 throw new Exception (Qwrong_type,
2040 "term is an integer: {0}", this);
2048 throw new Exception (Qwrong_type, "{0} is not an integer", this);
2053 public string Strval {
2056 throw new Exception (Qwrong_type, "{0} is not a string", this);
2057 return (string) objval;
2061 public string Symval {
2064 throw new Exception (Qwrong_type, "{0} is not a symbol", this);
2065 return (Symbol) objval;
2069 public List<Term> Listval {
2072 throw new Exception (Qwrong_type, "{0} is not a list");
2073 return (List<Term>) objval;
2077 public bool IsTrue {
2079 return (objval == null
2081 : objval is List<Term>
2082 ? (((List<Term>) objval).Count != 0)
2083 : objval is TermValue
2084 ? ((TermValue) objval).IsTrue
2089 public bool IsInt { get { return (objval == null); } }
2090 public bool IsStr { get { return (objval is string); } }
2091 public bool IsSymbol { get { return (objval is Symbol); } }
2092 public bool IsList { get { return (objval is List<Term>); } }
2093 public bool IsError { get { return (objval is ErrorTerm); } }
2095 private Term Eval (Domain domain)
2097 if (objval == null || objval is Symbol || objval is string
2098 || objval is List<Term>)
2100 domain.CallStackPush (this);
2101 Term result = ((TermValue) objval).Eval (domain);
2102 domain.CallStackPop ();
2106 public Term Clone ()
2108 if (objval == null || objval is Symbol || objval is string)
2110 if (objval is List<Term>)
2112 List<Term> list = new List<Term> ();
2113 list.InsertRange (0, ((List<Term>) objval));
2114 return new Term (list);
2116 return new Term (((TermValue) objval).Clone ());
2119 public static bool operator== (Term t1, Term t2)
2121 return t1.Equals (t2);
2124 public static bool operator!= (Term t1, Term t2) { return ! (t1 == t2); }
2126 public override bool Equals (object obj)
2128 if (! (obj is Term))
2130 Term term = (Term) obj;
2132 return term.IsInt && term.Intval == Intval;
2134 return term.IsStr && term.Strval == Strval;
2136 return term.IsSymbol && term.Symval == Symval;
2141 List<Term> l1 = objval as List<Term>;
2142 List<Term> l2 = term.objval as List<Term>;
2144 if (l1.Count != l2.Count)
2146 for (int i = 0; i < l1.Count; i++)
2147 if (! l1[i].Equals (l2[i]))
2151 return ((TermValue) objval).Equals (obj);
2154 public override int GetHashCode () { return intval; }
2156 public bool Matches (Term term)
2159 return term.IsInt && term.Intval == Intval;
2161 return term.IsStr && term.Strval == Strval;
2163 return term.IsSymbol && term.Symval == Symval;
2168 List<Term> l1 = objval as List<Term>;
2169 List<Term> l2 = term.objval as List<Term>;
2171 if (l1.Count > l2.Count)
2173 for (int i = 0; i < l1.Count; i++)
2174 if (! l1[i].Equals (l2[i]))
2178 return ((TermValue) objval).Matches ((TermValue) term.objval);
2181 public override string ToString () { return ToString (true); }
2183 public string ToString (bool detail)
2188 str = "<integer>" + intval + "</integer>";
2189 else if (objval is Symbol)
2190 str = "<symbol>" + objval + "</symbol>";
2191 else if (objval is string)
2192 str = "<string>" + objval + "</string>";
2193 else if (objval is List<Term>)
2198 foreach (Term e in (List<Term>) objval)
2205 else if (objval is Term)
2206 str = "<quote>" + objval + "</quote>";
2208 str = ((TermValue) objval).ToString (detail);
2213 private static Term Zero = new Term (0);
2214 private static Term One = new Term (1);
2215 private static Term TermInt = new Term (Qinteger);
2216 private static Term TermStr = new Term (Qstring);
2217 private static Term TermSymbol = new Term (Qsymbol);
2218 private static Term TermList = new Term (Qlist);
2219 private static Term TermTerm = new Term ((Symbol) "term");
2221 private static int parse_integer (XmlNode node)
2223 str = node.InnerText;
2224 int len = str.Length;
2225 bool negative = false;
2228 if (len == 1 && str[0] == '?')
2231 && str[1] == 'x' && ((c = str[0]) == '0' || c == '#'))
2233 if (! int.TryParse (str.SubString (2), NumberStyles.HexNumber, null,
2235 Exception.Throw (Qparse_error, node, "Invalid integer");
2238 if (! int.TryParse (str, out i))
2239 Exception.Throw (Qparse_error, node, "Invalid integer");
2243 static bool parse_error (XmlNode node, out Term term)
2246 term = new Term (node.OuterXml);
2248 term = memory_error;
2253 static bool parse_error (XmlNode node, out Term[] terms)
2256 terms = new Term[] { new Term (node.OuterXml) };
2258 terms = new Term[] { memory_error };
2263 private static Variable[] parse_args (Domain domain, XmlNode node,
2264 out int min_args, out int max_args)
2271 node = node.FirstChild;
2272 if (node != null && node.Name == Qargs)
2275 for (n = node.FirstChild; n != null; n = n.NextSibling)
2277 if (n.Name == Qfixed)
2278 nfixed += n.ChildNodes.Count;
2279 else if (n.Name == Qoptional)
2280 noptional += n.ChildNodes.Count;
2281 else if (n.Name == Qrest)
2284 throw new Exception (Qinvalid_argument_type, n);
2287 max_args = nfixed + noptional + nrest;
2288 args = new Variable[max_args];
2289 n = node.FirstChild;
2290 for (int i = 0; i < max_args; n = n.NextSibling)
2292 for (XmlNode nn = n.FirstChild; nn != null; nn = nn.NextSibling)
2293 args[i++] = domain.Defvar ((Symbol) nn.Attributes[0].Value);
2296 max_args = - max_args;
2300 min_args = max_args = 0;
2301 args = new Variable[0];
2306 public static Symbol parse_defun_head (Domain domain, XmlNode node)
2308 Symbol name = node.Attributes[Qfname].Value;
2309 int min_args, max_args;
2313 args = parse_head (domain, node, out min_args, out max_args);
2314 if (node.Name == Qdefun)
2315 domain.Defun (name, min_args, max_args, args, null);
2317 domain.Defmacro (name, min_args, max_args, args, null);
2318 } catch (Exception e) {
2319 if (e.ErrorNode == null)
2322 } catch (System.Exception e) {
2323 throw new Exception (node, e);
2328 public static void parse_defun_body (Domain domain, XmlNode node)
2330 Symbol name = node.Attributes[Qfname].Value;
2331 Function func = domain.GetFunc (name);
2333 for (node = node.FirstChild; node != null; node = node.NextSibling)
2334 if (node.Name != Qdescription
2335 && node.Name != Qargs)
2337 Term[] body = Parse (domain, node, null);
2338 if (node.Name == Qdefun)
2339 ((Function.Lambda) func).SetBody (body);
2341 ((Function.Macro) func).SetBody (body);
2344 public static Term Parse (Domain domain, XmlNode node)
2346 Symbol name = node.Name;
2348 if (name == Qinteger)
2349 return new Term (parse_integer (node));
2350 if (name == Qsymbol)
2351 return new Term ((Symbol) node.InnerText);
2352 if (name == Qstring)
2353 return new Term (node.InnerText);
2356 List<Term> list = new List<Term> ();
2357 for (node = node.FirstChild; node != null;
2358 node = node.NextSibling)
2359 list.Add (Parse (domain, node));
2360 return new Term (list);
2362 if (name == Qdefun || name == Qdefmacro)
2364 name = parse_defun_head (domain, node);
2365 parse_defun_body (domain, node);
2366 return new Term (name);
2368 if (name == Qdefvar)
2370 name = parse_defvar (domain, node);
2371 return new Term (name);
2374 if (domain.termtypes.TryGetValue (name, out minfo))
2376 object[] arg = new object[] { domain, node };
2377 return new Term ((TermValue) minfo.Invoke (null, arg));
2380 Funcall funcall = (Funcall) Funcall.Parser (domain, node);
2381 if (funcall.func is Function.Macro)
2382 return funcall.Eval (domain);
2383 return new Term (funcall);
2386 private static bool default_stop (XmlNode n) { return n == null; }
2388 public static List<Term> Parse (Domain domain, XmlNode node,
2389 Func<XmlNode, bool> stop)
2392 stop = default_stop;
2395 for (n = node; ! stop (n); n = n.NextSibling)
2396 if (n.NodeType == XmlNodeType.Element
2397 && (n.Name == Qdefun || n.Name == Qdefmacro))
2398 parse_defun_head (domain, n);
2400 List<Term> terms = new List<Term> ();
2401 for (; node != n; node = node.NextSibling)
2402 if (node.NodeType == XmlNodeType.Element)
2404 if (node.Name == Qdefun || node.Name == Qdefmacro)
2405 parse_defun_body (domain, node);
2406 else if (node.Name == Qdefvar)
2407 parse_defvar (domain, node);
2409 terms.Add (Parse (domain, node));
2414 public static List<Term> Parse (Domain domain, string url)
2416 XmlDocument doc = new XmlDocument (Symbol.NameTable);
2419 using (XmlTextReader reader = new XmlTextReader (url, doc.NameTable))
2423 } while (reader.NodeType != XmlNodeType.None
2424 && (reader.NodeType != XmlNodeType.Element
2425 || reader.Name != Qexpr));
2426 if (reader.NodeType == XmlNodeType.None)
2427 throw new Exception ("Node <expr> not found");
2428 node = doc.ReadNode (reader);
2430 return Parse (domain, node.FirstChild, null);
2433 public static Term Eval (Domain domain, List<Term> terms)
2437 foreach (Term term in terms)
2439 result = term.Eval (domain);