2 using System.Collections;
3 using System.Collections.Generic;
7 namespace System.Xml.Expression
9 public abstract class Xex
11 public struct Name : IEquatable<Name>
13 private static NameTable nt = new NameTable ();
17 public Name (string str)
22 public static implicit operator Name (string str)
24 return new Name (str);
27 public static implicit operator string (Name name)
32 public static bool operator== (Name n1, Name n2)
34 return (object) n1.name == (object) n2.name;
37 public static bool operator!= (Name n1, Name n2)
39 return (object) n1.name != (object) n2.name;
42 public static bool operator== (Name n1, string n2)
44 return (object) n1.name == (object) n2;
47 public static bool operator!= (Name n1, string n2)
49 return (object) n1.name != (object) n2;
52 public static bool operator== (string n1, Name n2)
54 return (object) n1 == (object) n2.name;
57 public static bool operator!= (string n1, Name n2)
59 return (object) n1 != (object) n2.name;
62 public bool Equals (Name name)
64 return Object.ReferenceEquals (this.name, name.name);
67 public override bool Equals (object obj)
69 return Object.ReferenceEquals (this.name, obj);
72 public override int GetHashCode ()
74 return name.GetHashCode ();
77 public static NameTable Table { get { return nt; } }
79 public override string ToString () { return name; }
82 private static Name Nexpr = "expr";
84 private static Name Nfuncall = "funcall";
85 private static Name Nvariable = "variable";
86 private static Name Ninteger = "integer";
87 private static Name Nstring = "string";
88 private static Name Nboolean = "boolean";
89 private static Name Nsymbol = "symbol";
90 private static Name Nlist = "list";
91 private static Name Nobject = "object";
93 private static Name Ndefun = "defun";
94 private static Name Nfname = "fname";
95 private static Name Nargs = "args";
96 private static Name Noptional = "optional";
97 private static Name Nrest = "rest";
98 private static Name Nbody = "body";
100 private static Name Ndefvar = "defvar";
101 private static Name Ndescription = "description";
102 private static Name Nrange = "range";
104 private static Name Nprogn = "progn";
106 internal abstract class Function
108 public readonly Name name;
109 public int min_arg, max_arg;
111 public Function (Name name, int min_arg, int max_arg)
114 this.min_arg = min_arg;
115 this.max_arg = max_arg;
118 public virtual object Call (Xex[] args, Domain domain)
122 Console.Write ("calling (" + this);
123 foreach (Xex a in args)
124 Console.Write (" " + a);
125 Console.Write (") => ");
126 result = builtin (args, domain);
127 Console.WriteLine (result);
131 public override string ToString ()
136 internal class Subroutine : Function
138 public Builtin builtin;
140 public Subroutine (Builtin builtin, Name name,
141 int min_arg, int max_arg)
142 : base (name, min_arg, max_arg)
144 this.builtin = builtin;
147 public override object Call (Xex[] args, Domain domain)
149 foreach (Xex a in args)
150 if (a.Eval (domain) == null)
151 throw new Exception (a + ":evaled to null");
152 return base.Call (args, domain);
156 internal class SpecialForm : Function
158 public Builtin builtin;
160 public SpecialForm (Builtin builtin, Name name,
161 int min_arg, int max_arg)
162 : base (name, min_arg, max_arg)
164 this.builtin = builtin;
167 public override object Call (Xex[] args, Domain domain)
172 internal class Lambda : Function
177 public Lambda (Name name, int min_arg, int max_arg)
178 : base (name, min_arg, max_arg)
182 public void SetArgs (XmlNode node, int nargs, Domain domain)
184 args = new Xex[nargs];
185 node = node.FirstChild;
186 for (int i = 0; i < nargs; node = node.NextSibling)
187 if (node.Name != Noptional && node.Name != Nrest)
188 args[i++] = New (node, domain);
191 public void SetBody (XmlNode node, Domain domain)
193 XmlNodeList nlist = node.ChildNodes;
195 body = new Xex[nlist.Count];
196 for (int i = 0; i < nlist.Count; i++)
197 body[i] = New (nlist[i], domain);
200 public void Setup (XmlNode node, Domain domain)
202 lambda = new Lambda ();
203 node = node.FirstChild;
204 if (node.Name == Nargs)
206 SetArgs (node, max_arg, domain);
207 node = node.NextSibling;
209 if (node.Name == Nbody)
210 SetBody (node, domain);
213 public static Name ParseHead (XmlNode node,
214 out int min_arg, out int max_arg)
216 Name name = node.Attributes[Nfname].Value;
217 int nargs = 0, noptions = 0, nrest = 0;
220 for (n = node.FirstChild; n != null; n = n.NextSibling)
222 if (n.Name == Noptional || n.Name == Nrest)
226 if (n != null && n.Name == Noptional)
227 for (n = n.NextSibling; n != null; n = n.NextSibling)
233 if (n != null && n.Name == Nrest)
234 for (n = n.NextSibling; n != null; n = n.NextSibling)
237 max_arg = nargs + noptions + nrest;
243 public override object Call (Xex[] args, Domain domain)
245 Bindings current = domain.bindings;
246 object result = false;
250 for (i = 0; i < min_arg; i++)
252 Xex a = this.args[i];
253 bool isdirect = a is Xex.Const;
254 Name name = (isdirect
255 ? (Name) a.val : ((Xex.Varref) a).vari.name);
256 Variable var = domain.GetVar (name);
259 domain.Bind (var, args[i].val);
261 domain.Bind (var, args[i].Eval (domain));
263 Console.Write ("calling (" + this);
264 foreach (Xex e in body)
265 result = e.Eval (domain);
266 Console.WriteLine (result);
268 domain.UnboundTo (current);
273 public override string ToString ()
276 foreach (Xex a in args)
283 internal abstract class Variable
285 public readonly Name name;
286 public readonly Name type;
289 public Variable (Name name, Name type, object value)
302 if (! ValueP (value))
303 throw new Exception ("Invalid value type: " + value);
308 public abstract bool ValueP (object value);
310 public override string ToString () { return name + "=" + val; }
313 internal class VarInt : Variable
320 public Range[] ranges;
322 public VarInt (Name name, object value) : base (name, Ninteger, value) { }
324 public override bool ValueP (object value)
328 if (! (value is int))
333 foreach (Range r in ranges)
334 if (i >= r.from && i <= r.to)
340 internal class VarStr : Variable
342 public string[] ranges;
344 public VarStr (Name name, object value) : base (name, Nstring, value) { }
346 public override bool ValueP (object value)
350 if (! (value is string))
354 str = (string) value;
355 foreach (string s in ranges)
362 internal class VarBool : Variable
364 public VarBool (Name name, object value)
365 : base (name, Nboolean, value) { }
367 public override bool ValueP (object value)
369 if (! (value is bool))
375 internal class VarMisc : Variable
377 public VarMisc (Name name, object value) : base (name, Nobject, value) { }
379 public override bool ValueP (object value)
385 internal class Bindings
387 private Variable vari;
388 private object old_value;
389 private Bindings next;
391 private Bindings (Variable vari, object value)
397 public static Bindings Bind (Bindings bindings,
398 Variable vari, object value)
400 Bindings b = new Bindings (vari, vari.val);
402 b.vari.Value = value;
407 internal Bindings UnboundTo (Bindings boundary)
409 for (Bindings b = this; b != boundary; b = b.next)
410 vari.val = b.old_value;
414 public override string ToString ()
416 string str = "(bindings";
417 for (Bindings b = this; b != null; b = b.next)
424 internal class ThrowException : Exception
429 public ThrowException (Name tag, object value) : base ()
439 public object context;
441 internal Dictionary<Name, Function> functions;
442 internal Dictionary<Name, Variable> variables;
443 internal Bindings bindings;
447 functions = new Dictionary<Name, Function> ();
448 variables = new Dictionary<Name, Variable> ();
451 public Domain (object context) : this (basic, context)
455 public Domain (Domain parent, object context)
457 functions = new Dictionary<Name, Function> (parent.functions);
458 variables = new Dictionary<Name, Variable> (parent.variables);
459 this.context = context;
462 internal void Bind (Variable vari, object value)
464 bindings = Bindings.Bind (bindings, vari, value);
465 Console.WriteLine ("binding " + vari);
468 internal void UnboundTo (Bindings boundary)
470 if (bindings != null)
471 bindings = bindings.UnboundTo (boundary);
474 public void DefSubr (Builtin builtin, string str,
475 int min_arg, int max_arg)
479 = new Function.Subroutine (builtin, name, min_arg, max_arg);
482 public void DefSpecial (Builtin builtin, string str,
483 int min_arg, int max_arg)
487 = new Function.SpecialForm (builtin, name, min_arg, max_arg);
490 internal Function.Lambda RegisterFunction (XmlNode node)
492 int min_arg, max_arg;
493 Name name = Function.ParseHead (node, out min_arg, out max_arg);
494 Lambda lambda = new Function.Lambda (name, min_arg, max_arg);
496 functions[name] = lambda;
500 internal Function Defun (XmlNode node)
502 Name name = node.Attributes[Nfname].Value;
503 Function.Lambda lambda;
505 if (! functions.TryGetValue (name, out lambda))
506 lambda = RegisterFunction (node);
507 lambda.Setup (node, this);
511 public void Defvar (Name name, XmlNode node)
515 if (node.Name == Ndescription)
516 node = node.NextSibling;
519 Name type = node.Name;
520 string val = node.Value;
521 XmlNodeList range_list = null;
524 node = node.NextSibling;
527 range_list = node.ChildNodes;
528 nranges = range_list.Count;
531 if (type == Ninteger)
533 VarInt vi = new VarInt (name, parse_integer (val));
534 if (range_list != null)
536 vi.ranges = new VarInt.Range[nranges];
538 for (int i = 0; i < nranges; i++)
540 XmlNode n = range_list[i];
542 if (n.Name == Nrange)
545 parse_integer (n.FirstChild.Value);
547 parse_integer (n.LastChild.Value);
551 int num = parse_integer (n.Value);
552 vi.ranges[i].from = vi.ranges[i].to = num;
558 else if (type == Nstring)
560 VarStr vs = new VarStr (name, val);
561 if (range_list != null)
562 vs.ranges = new string[nranges];
563 for (int i = 0; i < nranges; i++)
564 vs.ranges[i] = range_list[i].Value;
567 else if (type == Nboolean)
569 vari = new VarBool (name, val == "true");
572 throw new Exception ("Unknown type: " + type);
575 vari = new VarMisc (name, null);
576 variables[name] = vari;
579 internal Function GetFunc (Name name)
583 if (! functions.TryGetValue (name, out func))
584 throw new Exception ("Unknown function: " + name);
588 public bool CopyFunc (Domain domain, Name name)
590 Function func = GetFunc (name);
592 domain.functions[name] = func;
596 public void CopyFunc (Domain domain)
598 foreach (KeyValuePair<Name, Function> kv in functions)
599 domain.functions[kv.Key] = kv.Value;
602 internal Variable GetVar (Name name)
606 if (! variables.TryGetValue (name, out vari))
607 variables[name] = vari = new VarMisc (name, null);
611 internal Variable GetVar (Xex e)
613 if (! (e.val is Name))
614 throw new Exception ("Not a symbol" + e.val);
615 return GetVar ((Name) e.val);
618 public override string ToString ()
620 string str = "<(functions";
621 foreach (KeyValuePair<Name, Function> kv in functions)
623 str += ") (variabls";
624 foreach (KeyValuePair<Name, Variable> kv in variables)
627 if (bindings != null)
628 str += " " + bindings;
630 str += " (" + context + ")";
636 public delegate object Builtin (Xex[] args, Domain domain);
638 private static Domain basic = new Domain ();
640 internal static Function Fprogn;
644 basic.DefSubr (set_value, "set", 2, 2);
645 basic.DefSubr (set_value, "=", 2, 2);
646 basic.DefSubr (and, "and", 1, -1);
647 basic.DefSubr (and, "&&", 1, -1);
648 basic.DefSubr (or, "or", 1, -1);
649 basic.DefSubr (or, "||", 1, -1);
650 basic.DefSubr (not, "not", 1, 1);
651 basic.DefSubr (not, "!", 1, 1);
652 basic.DefSubr (add, "add", 2, -1);
653 basic.DefSubr (add, "+", 2, -1);
654 basic.DefSubr (mul, "mul", 2, -1);
655 basic.DefSubr (mul, "*", 2, -1);
656 basic.DefSubr (sub, "sub", 1, -1);
657 basic.DefSubr (sub, "-", 1, -1);
658 basic.DefSubr (div, "div", 2, -1);
659 basic.DefSubr (div, "/", 2, -1);
660 basic.DefSubr (mod, "mod", 2, 2);
661 basic.DefSubr (mod, "%", 2, 2);
662 basic.DefSubr (logior, "logior", 2, -1);
663 basic.DefSubr (logior, "|", 2, -1);
664 basic.DefSubr (logand, "logand", 2, -1);
665 basic.DefSubr (logand, "&", 2, -1);
666 basic.DefSubr (add_set, "add-set", 2, -1);
667 basic.DefSubr (add_set, "+=", 2, -1);
668 basic.DefSubr (mul_set, "mul-set", 2, -1);
669 basic.DefSubr (mul_set, "*=", 2, -1);
670 basic.DefSubr (sub_set, "sub-set", 2, -1);
671 basic.DefSubr (sub_set, "-=", 2, -1);
672 basic.DefSubr (div_set, "div-set", 2, -1);
673 basic.DefSubr (div_set, "/=", 2, -1);
674 basic.DefSubr (mod_set, "mod-set", 2, 2);
675 basic.DefSubr (mod_set, "%=", 2, 2);
676 basic.DefSubr (logior_set, "logior-set", 2, -1);
677 basic.DefSubr (logior_set, "|=", 2, -1);
678 basic.DefSubr (logand_set, "logand-set", 2, -1);
679 basic.DefSubr (logand_set, "&=", 2, -1);
680 basic.DefSubr (lsh, "lsh", 2, 2);
681 basic.DefSubr (lsh, "<<", 2, 2);
682 basic.DefSubr (rsh, "rsh", 2, 2);
683 basic.DefSubr (rsh, ">>", 2, 2);
684 basic.DefSubr (lsh_set, "lsh-set", 2, 2);
685 basic.DefSubr (lsh_set, "<<=", 2, 2);
686 basic.DefSubr (rsh_set, "rsh-set", 2, 2);
687 basic.DefSubr (rsh_set, ">>=", 2, 2);
688 basic.DefSubr (eq, "eq", 2, -1);
689 basic.DefSubr (eq, "==", 2, -1);
690 basic.DefSubr (noteq, "noteq", 2, 2);
691 basic.DefSubr (noteq, "!=", 2, 2);
692 basic.DefSubr (less_than, "lt", 2, -1);
693 basic.DefSubr (less_than, "<", 2, -1);
694 basic.DefSubr (less_eq, "le", 2, -1);
695 basic.DefSubr (less_eq, "<=", 2, -1);
696 basic.DefSubr (greater_than, "gt", 2, -1);
697 basic.DefSubr (greater_than, ">", 2, -1);
698 basic.DefSubr (greater_eq, "ge", 2, -1);
699 basic.DefSubr (greater_eq, ">=", 2, -1);
700 basic.DefSubr (eval_clause, "eval", 1, 1);
701 basic.DefSpecial (progn_clause, "progn", 0, -1);
702 basic.DefSpecial (progn_clause, "expr", 0, -1);
703 basic.DefSpecial (if_clause, "if", 2, -1);
704 basic.DefSpecial (when_clause, "when", 1, -1);
705 basic.DefSpecial (while_clause, "while", 1, -1);
707 Fprogn = basic.GetFunc (Nprogn);
710 private static bool is_true (object val)
712 return (val is bool ? (bool) val
713 : val is int ? (int) val == 0
717 private static object set_value (Xex[] args, Domain domain)
719 Variable vari = domain.GetVar (args[0]);
721 vari.Value = args[1].val;
725 private static object and (Xex[] args, Domain domain)
727 foreach (Xex arg in args)
728 if (! is_true (arg.val))
733 private static object or (Xex[] args, Domain domain)
735 foreach (Xex arg in args)
736 if (is_true (arg.val))
741 private static object not (Xex[] args, Domain domain)
743 return ! is_true (args[0].val);
746 private static object add (Xex[] args, Domain domain)
749 foreach (Xex e in args)
754 private static object mul (Xex[] args, Domain domain)
757 foreach (Xex e in args)
762 private static object sub (Xex[] args, Domain domain)
764 int n = (int) args[0].val;
765 if (args.Length == 1)
767 for (int i = 1; i < args.Length; i++)
768 n -= (int) args[i].val;
772 private static object div (Xex[] args, Domain domain)
774 int n = (int) args[0].val;
775 for (int i = 1; i < args.Length; i++)
776 n /= (int) args[i].val;
780 private static object mod (Xex[] args, Domain domain)
782 return ((int) args[0].val % (int) args[1].val);
785 private static object logior (Xex[] args, Domain domain)
788 foreach (Xex e in args)
793 private static object logand (Xex[] args, Domain domain)
795 int n = (int) args[0].val;
796 for (int i = 1; i < args.Length; i++)
797 n &= (int) args[i].val;
801 private static object add_set (Xex[] args, Domain domain)
803 Variable vari = domain.GetVar (args[0]);
804 int n = (int) vari.val;
806 for (int i = 1; i < args.Length; i++)
807 n += (int) args[i].val;
812 private static object mul_set (Xex[] args, Domain domain)
814 Variable vari = domain.GetVar (args[0]);
815 int n = (int) vari.val;
817 for (int i = 1; i < args.Length; i++)
818 n *= (int) args[i].val;
823 private static object sub_set (Xex[] args, Domain domain)
825 Variable vari = domain.GetVar (args[0]);
826 int n = (int) vari.val;
828 for (int i = 1; i < args.Length; i++)
829 n -= (int) args[i].val;
834 private static object div_set (Xex[] args, Domain domain)
836 Variable vari = domain.GetVar (args[0]);
837 int n = (int) vari.val;
839 for (int i = 1; i < args.Length; i++)
840 n /= (int) args[i].val;
845 private static object mod_set (Xex[] args, Domain domain)
847 Variable vari = domain.GetVar (args[0]);
848 int n = (int) vari.val;
850 for (int i = 1; i < args.Length; i++)
851 n %= (int) args[i].val;
856 private static object logior_set (Xex[] args, Domain domain)
858 Variable vari = domain.GetVar (args[0]);
859 int n = (int) vari.val;
861 for (int i = 1; i < args.Length; i++)
862 n |= (int) args[i].val;
867 private static object logand_set (Xex[] args, Domain domain)
869 Variable vari = domain.GetVar (args[0]);
870 int n = (int) vari.val;
872 for (int i = 1; i < args.Length; i++)
873 n &= (int) args[i].val;
878 private static object lsh (Xex[] args, Domain domain)
880 return (int) args[0].val << (int) args[1].val;
883 private static object lsh_set (Xex[] args, Domain domain)
885 Variable vari = domain.GetVar (args[0]);
886 int n = (int) vari.val;
888 n <<= (int) args[1].val;
893 private static object rsh (Xex[] args, Domain domain)
895 return (int) args[0].val >> (int) args[1].val;
898 private static object rsh_set (Xex[] args, Domain domain)
900 Variable vari = domain.GetVar (args[0]);
901 int n = (int) vari.val;
903 n >>= (int) args[1].val;
908 private static object eq (Xex[] args, Domain domain)
910 int n = (int) args[0].val;
912 for (int i = 1; i < args.Length; i++)
913 if (n != (int) args[i].val)
918 private static object noteq (Xex[] args, Domain domain)
920 return ((int) args[0].val != (int) args[1].val);
923 private static object less_than (Xex[] args, Domain domain)
925 int n = (int) args[0].val;
927 for (int i = 1; i < args.Length; i++)
929 int n1 = (int) args[i].val;
937 private static object less_eq (Xex[] args, Domain domain)
939 int n = (int) args[0].val;
940 for (int i = 1; i < args.Length; i++)
942 int n1 = (int) args[i].val;
950 private static object greater_than (Xex[] args, Domain domain)
952 int n = (int) args[0].val;
953 for (int i = 1; i < args.Length; i++)
955 int n1 = (int) args[i].val;
963 private static object greater_eq (Xex[] args, Domain domain)
965 int n = (int) args[0].val;
966 for (int i = 1; i < args.Length; i++)
968 int n1 = (int) args[i].val;
976 private static object eval_clause (Xex[] args, Domain domain)
978 return args[0].Eval (domain);
981 private static object progn_clause (Xex[] args, Domain domain)
983 object result = true;
985 foreach (Xex e in args)
986 result = e.Eval (domain);
990 private static object if_clause (Xex[] args, Domain domain)
994 if (is_true (args[0].Eval (domain)))
995 result = args[1].Eval (domain);
999 for (int i = 2; i < args.Length; i++)
1000 result = args[i].Eval (domain);
1005 private static object when_clause (Xex[] args, Domain domain)
1007 if (! is_true (args[0].Eval (domain)))
1010 object result = true;
1011 for (int i = 1; i < args.Length; i++)
1012 result = args[i].Eval (domain);
1016 private static object while_clause (Xex[] args, Domain domain)
1018 while (is_true (args[0].Eval (domain)))
1019 for (int i = 1; i < args.Length; i++)
1020 args[i].Eval (domain);
1024 // FUNCALL: function != null
1025 // VARREF: function == null, args[0] = DIRECT-SYMBOL
1026 // DIRECT: function == null, args == null
1029 public abstract object Eval (Domain domain);
1030 public object Val { get { return val; } }
1032 private class Funcall : Xex
1034 internal Function func;
1035 internal Xex[] args;
1037 public Funcall (Function func, Xex[] args)
1043 public override object Eval (Domain domain)
1045 val = func.Call (args, domain);
1049 public override string ToString ()
1051 string str = "(" + func.name;
1053 foreach (Xex e in args)
1054 str += " " + e.ToString ();
1059 private class Varref : Xex
1061 internal Variable vari;
1063 public Varref (Variable vari)
1068 public override object Eval (Domain domain)
1074 public override string ToString ()
1076 return "$" + vari.name + "/" + vari.val;
1080 private class Const : Xex
1082 public Const (object val)
1087 public override object Eval (Domain domain)
1092 public override string ToString ()
1094 return val.ToString ();
1098 internal static int parse_integer (string str)
1100 int len = str.Length;
1101 bool negative = false;
1104 return (len == 0 ? 0 : str[0] - '0');
1109 if (c == '0' && str[1] == 'x')
1112 for (int idx = 2; idx < len; idx++)
1118 i = i * 16 + (c - '0');
1122 i = i * 16 + (c - 'A');
1126 i = i * 16 + (c - 'a');
1135 for (int idx = 1; idx < len; idx++)
1138 if (c < '0' || c > '9')
1140 i = i * 10 + (c - '0');
1142 return negative ? - i : i;
1145 private static int pre_parse (XmlNodeList nlist, Domain domain)
1148 foreach (XmlNode node in nlist)
1150 if (node.Name == Ndefun)
1151 domain.RegisterFunction (node);
1152 else if (node.Name == Ndefvar)
1153 domain.Defvar ((Name) node.Attributes[0].Value, node.FirstChild);
1160 private static void post_parse (XmlNodeList nlist, Xex[] args,
1163 for (int i = 0, j = 0; i < nlist.Count; i++)
1165 XmlNode node = nlist[i];
1167 if (node.Name == Ndefun)
1168 domain.Defun (node);
1169 else if (node.Name != Ndefvar)
1170 args[j++] = New (node, domain);
1174 public static Xex New (string url, Domain domain)
1176 XmlDocument doc = new XmlDocument (Name.Table);
1179 using (XmlTextReader reader = new XmlTextReader (url, Name.Table))
1183 } while (reader.NodeType != XmlNodeType.None
1184 && (reader.NodeType != XmlNodeType.Element
1185 || Nexpr != reader.Name));
1186 if (reader.NodeType == XmlNodeType.None)
1187 throw new Exception ("Node <expr> not found");
1188 node = doc.ReadNode (reader);
1191 return New (node, domain);
1194 // EXPR = SYMBOL | MTEXT | INTEGER | FUNCALL | PROGN
1195 // FUNCALL = '(' SYMBOL EXPR* ')'
1196 // PROGN = '(' EXPR * ')'
1197 public static Xex New (XmlNode node, Domain domain)
1199 Name name = node.Name;
1201 if (name == Nvariable)
1203 Variable vari = domain.GetVar ((Name) node.Attributes[0].Value);
1204 xex = new Xex.Varref (vari);
1206 else if (name == Ninteger)
1207 xex = new Xex.Const (parse_integer (node.InnerText));
1208 else if (name == Nstring)
1209 xex = new Xex.Const (node.InnerText);
1210 else if (name == Nsymbol)
1211 xex = new Xex.Const ((Name) node.InnerText);
1212 else if (name == Nboolean)
1213 xex = new Xex.Const (node.InnerText == "true");
1214 else if (name == Nlist)
1216 List<Xex> list = new List<Xex> ();
1217 for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling)
1218 list.Add (New (n, domain));
1219 xex = new Xex.Const (list);
1223 if (name == Nfuncall)
1224 name = node.Attributes[0].Value;
1225 Function func = domain.GetFunc (name);
1227 XmlNodeList nlist = node.ChildNodes;
1228 int nargs = nlist.Count;
1230 if (nargs < func.min_arg
1231 || (func.max_arg >= 0 && nargs > func.max_arg))
1232 throw new Exception ("Invalid number of arguments to: "
1233 + name + " " + nargs);
1234 nargs = pre_parse (nlist, domain);
1235 Xex[] args = new Xex[nargs];
1236 post_parse (nlist, args, domain);
1237 xex = new Xex.Funcall (func, args);