1 // xex.js -- Xex (XML Expression) interpreter
3 // National Institute of Advanced Industrial Science and Technology (AIST)
4 // Registration Number H15PRO112
6 // This file is part of the m17n database; a sub-part of the m17n
9 // The m17n library is free software; you can redistribute it and/or
10 // modify it under the terms of the GNU Lesser General Public License
11 // as published by the Free Software Foundation; either version 2.1 of
12 // the License, or (at your option) any later version.
14 // The m17n library is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 // Lesser General Public License for more details.
19 // You should have received a copy of the GNU Lesser General Public
20 // License along with the m17n library; if not, write to the Free
21 // Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 // Boston, MA 02110-1301, USA.
26 (function () { // Tracing
27 // The logging node containing tracing information.
31 // Style properties of the logging node.
32 var styles = { border: '1px solid black',
33 font: 'normal normal normal small monospace',
39 // Toggle logging on and off. PARENT if non-null specifies the
40 // parent of the log node. The log node is appended to PARENT.
41 // If PARENT is null, 'body' node is assumed.
42 Xex.LogToggle = function (parent)
46 log.parentNode.removeChild (log);
51 parent = document.getElementsByTagName ('body')[0];
52 log = document.createElement ('ol');
53 for (var prop in styles)
54 log.style[prop] = styles[prop];
55 parent.appendChild (log);
60 // Log ARG (string). INDENT if specified is a number of columns to
61 // indent. If INDENT is -1, ARG is appended to the last log.
62 Xex.Log = function (arg, indent)
68 while (log.childNodes.length > 0)
69 log.removeChild (log.firstChild);
76 log.lastChild.innerText += arg;
82 node = log.firstElement ();
83 log.start = lines - 254;
86 node = document.createElement ('li');
87 if (indent != undefined)
88 node.style.textIndent = (indent + 1) + 'em';
90 node.style.textIndent = '0px';
92 log.appendChild (node);
93 log.scrollTop = log.scrollHeight;
100 UnknownError: "unknown-error",
101 WrongArgument: "wrong-argument",
103 InvalidInteger: "invalid-integer",
104 TermTypeInvalid: "term-type-invalid",
105 FunctionConflict: "function-conflict",
106 VariableTypeConflict: "variable-type-conflict",
107 VariableRangeConflict: "variable-range-conflict",
108 VariableWrongRange: "variable-wrong-range",
109 VariableWrongValue: "variable-wrong-value",
111 UnknownFunction: "unknown-function",
112 MacroExpansionError: "macro-expansion-error",
113 NoVariableName: "no-variable-name",
114 NoFunctionName: "no-funcion-name",
117 ArithmeticError: "arithmetic-error",
118 WrongType: "wrong-type",
119 IndexOutOfRange: "index-out-of-range",
120 ValueOutOfRange: "value-out-of-range",
121 NoLoopToBreak: "no-loop-to-break",
122 UncaughtThrow: "uncaught-throw"
125 Xex.Variable = function (domain, name, desc, val, range)
127 this.domain = domain;
134 Xex.Variable.prototype.clone = function ()
136 return new Xex.Variable (this.domain, this.name, this.desc,
137 this.val, this.range);
140 Xex.Variable.prototype.Equals = function (obj)
142 return ((obj instanceof Xex.Variable)
143 && obj.name == this.name);
146 Xex.Variable.prototype.SetValue = function (term)
152 Xex.Function = function (name, with_var, min_args, max_args)
155 this.with_var = with_var;
156 this.min_args = min_args;
157 this.max_args = max_args;
160 Xex.Subrountine = function (builtin, name, with_var, min_args, max_args)
162 Xex.Function.apply (this, [name, with_var, min_args, max_args]);
163 this.builtin = builtin;
166 Xex.Subrountine.prototype.Call = function (domain, vari, args)
168 var newargs = new Array ();
169 for (var i = 0; i < args.length; i++)
171 newargs[i] = args[i].Eval (domain);
172 if (domain.Thrown ())
175 return this.builtin (domain, vari, newargs)
178 Xex.SpecialForm = function (builtin, name, with_var, min_args, max_args)
180 Xex.Function.apply (this, [name, with_var, min_args, max_args]);
181 this.builtin = builtin;
184 Xex.SpecialForm.prototype.Call = function (domain, vari, args)
186 return this.builtin (domain, vari, args)
189 Xex.Lambda = function (name, min_args, max_args, args, body)
191 Xex.Function.apply (this, [name, false, min_args, max_args]);
196 Xex.Lambda.prototype.Call = function (domain, vari, args)
198 var current = domain.bindings;
199 var result = Xex.Zero;
200 var limit = max_args >= 0 ? args.length : args.length - 1;
204 for (i = 0; i < limit; i++)
206 result = args[i].Eval (domain);
207 if (domain.Thrown ())
209 domain.Bind (this.args[i], result);
213 var list = new Array ();
214 for (i = 0; i < args[limit].length; i++)
216 result = args[limit].Eval (domain);
217 if (domain.Thrown ())
221 domain.Bind (this.args[limit], list);
224 domain.Catch (Xex.CatchTag.Return);
225 for (var term in this.body)
227 result = term.Eval (domain);
228 if (domain.Thrown ())
235 domain.UnboundTo (current);
240 Xex.Macro = function (name, min_args, max_args, args, body)
242 Xex.Function.apply (this, [name, false, min_args, max_args]);
247 Xex.Macro.prototype.Call = function (domain, vari, args)
249 var current = domain.bindings;
250 var result = Xex.Zero;
254 for (i = 0; i < args.length; i++)
255 domain.Bind (this.args[i], args[i]);
257 domain.Catch (Xex.CatchTag.Return);
258 for (var i in this.body)
260 result = this.body[i].Eval (domain);
261 if (domain.Thrown ())
268 domain.UnboundTo (current);
273 Xex.Bindings = function (vari)
276 this.old_value = vari.val;
279 Xex.Bindings.prototype.UnboundTo = function (boundary)
281 for (var b = this; b != boundary; b = b.next)
282 b.vari.val = b.old_value;
286 Xex.Bind = function (bindings, vari, val)
288 var b = new Xex.Bindings (vari);
299 Xex.Domain = function (name, parent, context)
302 this.context = context;
305 if (name != 'basic' && ! parent)
306 parent = Xex.BasicDomain
307 this.parent = parent;
314 for (elt in parent.termtypes)
315 this.termtypes[elt] = parent.termtypes[elt];
316 for (elt in parent.functions)
317 this.functions[elt] = parent.functions[elt];
318 for (elt in parent.variables)
320 var vari = parent.variables[elt];
321 this.variables[elt] = new Xex.Variable (this, vari.name, vari.desc,
322 vari.val, vari.range);
326 this.call_stack = new Array ();
327 this.bindings = null;
328 this.catch_stack = new Array ();
329 this.catch_count = 0;
333 Xex.Domain.prototype = {
334 CallStackCount: function () { return this.call_stack.length; },
335 CallStackPush: function (term) { this.call_stack.push (term); },
336 CallStackPop: function () { this.call_stack.pop (); },
337 Bind: function (vari, val)
339 this.bindings = Xex.Bind (this.bindings, vari, val);
341 UnboundTo: function (boundary)
344 this.bindings = this.bindings.UnboundTo (boundary);
346 Catch: function (tag) { this.catch_stack.push (tag); this.catch_count++; },
349 this.catch_stack.pop ();
350 if (this.catch_count > this.catch_stack.length)
355 if (this.catch_count < this.catch_stack.length)
357 this.caught = (this.catch_count == this.catch_stack.length - 1);
363 ThrowReturn: function ()
365 for (var i = this.catch_stack.length - 1; i >= 0; i--)
368 if (this.catch_stack[i] == Xex.CatchTag.Return)
372 ThrowBreak: function ()
374 if (this.catch_stack[this.catch_stack.length - 1] != Xex.CatchTag.Break)
375 throw new Xex.ErrTerm (Xex.Error.NoLoopToBreak,
376 "No surrounding loop to break");
379 ThrowSymbol: function (tag)
381 var i = this.catch_count;
382 for (var j = this.catch_stack.length - 1; j >= 0; j--)
385 if (Xex.CatchTag.Matches (this.catch_stack[i], tag))
387 this.catch_count = i;
391 throw new Xex.ErrTerm (Xex.Error.UncaughtThrow,
392 "No corresponding catch: " + tag);
394 DefType: function (obj)
397 if (this.termtypes[type])
398 throw new Xex.ErrTerm (Xex.Error.TermTypeInvalid,
399 "Already defined: " + type);
400 if (this.functions[type])
401 throw new Xex.ErrTerm (Xex.Error.TermTypeInvalid,
402 "Already defined as a funciton or a macro: "
404 this.termtypes[type] = obj.Parser;
406 DefSubr: function (builtin, name, with_var, min_args, max_args)
408 this.functions[name] = new Xex.Subrountine (builtin, name, with_var,
411 DefSpecial: function (builtin, name, with_var, min_args, max_args)
413 this.functions[name] = new Xex.SpecialForm (builtin, name, with_var,
416 Defun: function (name, min_args, max_args, args, body)
418 this.functions[name] = new Xex.Lambda (name, min_args, max_args,
421 DefunByFunc: function (func) { this.functions[func.name] = func; },
422 Defmacro: function (name, min_args, max_args, args, body)
424 this.functions[name] = new Xex.Macro (name, min_args, max_args,
427 DefAlias: function (alias, fname)
429 var func = this.functions[fname];
432 throw new Xex.ErrTerm (Xex.Error.UnknownFunction, fname);
433 if (this.termtypes[alias])
434 throw new Xex.ErrTerm (Xex.Error.FunctionConflict,
435 "Already defined as a term type: " + alias);
436 if (this.functions[alias])
437 throw new Xex.ErrTerm (Xex.Error.FunctionConflict,
438 "Already defined as a function: " + alias);
439 this.functions[alias] = func;
441 Defvar: function (name, desc, val, range)
443 var vari = new Xex.Variable (this, name, desc, val, range);
444 this.variables[name] = vari;
447 GetFunc: function (name)
449 var func = this.functions[name];
451 throw new Xex.ErrTerm (Xex.Error.UnknownFunction,
452 "Unknown function: " + name);
455 CopyFunc: function (domain, name)
457 var func = this.functions[name];
458 domain.DefunByFunc (func);
461 CopyFuncAll: function (domain)
463 for (var elt in this.functions)
464 domain.DefunByFunc (this.functions[elt]);
466 GetVarCreate: function (name)
468 var vari = this.variables[name];
470 vari = this.variables[name] = new Xex.Variable (this, name, null,
474 GetVar: function (name) { return this.variables[name]; },
475 SaveValues: function ()
478 for (var elt in this.variables)
479 values[elt] = this.variables[elt].val.Clone ();
482 RestoreValues: function (values)
487 var vari = this.variables[name];
488 vari.val = values[name];
493 Xex.Term = function (type) { this.type = type; }
494 Xex.Term.prototype = {
495 IsTrue: function () { return true; },
496 Eval: function (domain) { return this.Clone (); },
497 Clone: function (domain) { return this; },
498 Equals: function (obj)
500 return (this.type == obj.type
501 && this.val != undefined
502 && obj.val == this.val);
504 Matches: function (obj) { return this.Equals (obj); },
505 toString: function ()
507 if (this.val != undefined)
508 return '<' + this.type + '>' + this.val + '</' + this.type + '>';
509 return '<' + this.type + '/>';
511 Intval: function () { throw new Xex.ErrTerm (Xex.Error.WrongType,
512 "Not an integer"); },
513 Strval: function () { throw new Xex.ErrTerm (Xex.Error.WrongType,
517 Node.prototype.firstElement = function ()
519 for (var n = this.firstChild; n; n = n.nextSibling)
525 Node.prototype.nextElement = function ()
527 for (var n = this.nextSibling; n; n = n.nextSibling)
534 function parse_defvar (domain, node)
536 var name = node.attributes['vname'].nodeValue;
538 throw new Xex.ErrTerm (Xex.Error.NoVariableName, node, '');
539 var vari = domain.variables[name];
540 var desc, val = null, range;
543 desc = vari.description;
547 node = node.firstElement ();
548 if (node && node.nodeName == 'description')
550 desc = node.firstChild.nodeValue;
551 node = node.nextElement ();
555 val = Xex.Term.Parse (domain, node);
556 node = node.nextElement ();
557 if (node && node.nodeName == 'possible-values')
558 for (node = node.firstElement (); node; node = node.nextElement ())
561 if (node.nodeName == 'range')
564 throw new Xex.ErrTerm (Xex.Error.TermTypeInvalid,
565 'Range not allowed for ' + name);
567 for (var n = node.firstElement (); n; n = n.nextElement ())
569 var v = Xex.Term.Parse (domain, n);
571 throw new Xex.ErrTerm (Xex.Error.TermTypeInvalid,
572 'Invalid range value: ' + val);
578 pval = Xex.Term.Parse (domain, node);
579 if (val.type != pval.type)
580 throw new Xex.ErrTerm (Xex.Error.TermTypeInvalid,
581 'Invalid possible value: ' + pval);
584 range = new Array ();
590 domain.Defvar (name, desc, val, range);
594 function parse_defun_head (domain, node)
596 var name = node.attributes['fname'].nodeValue;
598 throw new Xex.ErrTerm (Xex.Error.NoFunctionName, node, '');
599 var args = new Array ();
600 var nfixed = 0, noptional = 0, nrest = 0;
602 node = node.firstElement ();
603 if (node && node.nodeName == 'args')
606 for (n = n.firstElement (); n; n = n.nextElement ())
608 if (n.nodeName == 'fixed')
610 else if (n.nodeName == 'optional')
612 else if (n.nodeName == 'rest')
615 throw new Xex.ErrTerm (Xex.Error.WrongType, n, n.nodeName);
618 throw new Xex.ErrTerm (Xex.Error.WrongType, n, 'Too many <rest>');
619 for (n = node.firstElement (); n; n = n.nextElement ())
620 args.push (domain.DefVar (n.attributes['vname'].nodeValue));
622 args.min_args = nfixed;
623 args.max_args = nrest == 0 ? nfixed + noptional : -1;
625 if (node.nodeName == 'defun')
626 domain.Defun (name, args, null);
628 domain.Defmacro (name, args, null);
632 function parse_defun_body (domain, node)
634 var name = node.attributes['fname'].nodeValue;
635 var func = domain.GetFunc (name);
637 for (node = node.firstElement (); node; node = node.nextElement ())
638 if (node.nodeName != 'description' && node.nodeName != 'args')
640 body = Xex.Term.Parse (domain, node, null);
644 Xex.Term.Parse = function (domain, node, stop)
646 if (arguments.length == 2)
648 var name = node.nodeName;
649 var parser = domain.termtypes[name];
652 return parser (domain, node);
653 if (name == 'defun' || name == 'defmacro')
655 name = parse_defun_head (domain, node);
656 parse_defun_body (domain, node);
657 return new Xex.StrTerm (name);
659 if (name == 'defvar')
661 name = parse_defvar (domain, node);
662 return new Xex.StrTerm (name);
664 return new Xex.Funcall.prototype.Parser (domain, node);
666 for (var n = node; n && n != stop; n = n.nextElement ())
667 if (n.nodeName == 'defun' || n.nodeName == 'defmacro')
668 parse_defun_head (domain, n);
670 for (var n = node; n && n != stop; n = n.nextElement ())
672 if (n.nodeName == 'defun' || n.nodeName == 'defmacro')
673 parse_defun_body (domain, n);
674 else if (n.nodeName == 'defvar')
675 parse_defvar (domain, n);
679 terms = new Array ();
680 terms.push (Xex.Term.Parse (domain, n));
687 Xex.Varref = function (vname)
693 var proto = new Xex.Term ('varref');
695 proto.Clone = function () { return new Xex.Varref (this.val); }
696 proto.Eval = function (domain)
698 var vari = domain.GetVarCreate (this.val);
699 Xex.Log (this.ToString () + '=>' + vari.val, domain.depth);
703 proto.Parser = function (domain, node)
705 return new Xex.Varref (node.attributes['vname'].nodeValue);
708 proto.ToString = function ()
710 return '<varref vname="' + this.val + '"/>';
713 Xex.Varref.prototype = proto;
716 var null_args = new Array ();
718 Xex.Funcall = function (func, vname, args)
722 this.args = args || null_args;
726 var proto = new Xex.Term ('funcall');
728 proto.Parser = function (domain, node)
730 var fname = node.nodeName;
733 if (fname == 'funcall')
734 fname = node.attributes['fname'].nodeValue;
735 var func = domain.GetFunc (fname);
737 attr = node.attributes['vname'];
738 vname = attr != undefined ? attr.nodeValue : null;
739 var args = Xex.Term.Parse (domain, node.firstElement (), null);
740 return new Xex.Funcall (func, vname, args);
743 proto.New = function (domain, fname, vname, args)
745 var func = domain.GetFunc (fname);
746 var funcall = new Xex.Funcall (func, vname, args);
747 if (func instanceof Xex.Macro)
748 funcall = funcall.Eval (domain);
752 proto.Eval = function (domain)
754 Xex.Log (this, domain.depth);
757 vari = domain.GetVarCreate (this.vname);
761 result = this.func.Call (domain, vari, this.args);
763 Xex.Log (' => ' + result, --domain.depth,
764 this.func instanceof Xex.Subrountine);
769 proto.Clone = function ()
771 return new Xex.Funcall (this.func, this.vari, this.args);
774 proto.Equals = function (obj)
776 return (obj.type == 'funcall'
777 && obj.func == this.func
778 && obj.vari.Equals (this.vari)
779 && obj.args.length == this.func.length);
782 proto.toString = function ()
785 var len = this.args.length;
786 var str = '<' + this.func.name;
788 str += ' vname="' + this.vname + '"';
791 if (this.func instanceof Xex.Subrountine)
792 for (var i = 0; i < len; i++)
793 arglist += this.args[i].toString ();
795 for (var i = 0; i < len; i++)
797 return str + '>' + arglist + '</' + this.func.name + '>';
800 Xex.Funcall.prototype = proto;
803 Xex.ErrTerm = function (ename, message, stack)
806 this.message = message;
811 var proto = new Xex.Term ('error');
813 proto.IsError = true;
815 proto.Parser = function (domain, node)
817 return new Xex.ErrTerm (node.attributes['ename'].nodeValue,
818 node.innerText, false);
821 proto.CallStack = function () { return stack; }
823 proto.SetCallStack = function (value) { statck = value; }
825 proto.Clone = function ()
827 return new Xex.ErrTerm (ename, message, false);
830 proto.Equals = function (obj)
833 && obj.ename == ename && obj.message == message
834 && (obj.stack ? (stack && stack.length == obj.stack.length)
838 proto.Matches = function (obj)
840 return (obj.IsError && obj.ename == ename);
843 proto.toString = function ()
845 return '<error ename="' + this.ename + '">' + this.message + '</error>';
848 Xex.ErrTerm.prototype = proto;
851 Xex.IntTerm = function (num) { this.val = num; };
853 var proto = new Xex.Term ('integer');
855 proto.Intval = function () { return this.val; };
856 proto.IsTrue = function () { return this.val != 0; }
857 proto.Clone = function () { return new Xex.IntTerm (this.val); }
858 proto.Parser = function (domain, node)
860 var str = node.firstChild.nodeValue;
862 if (str.charAt (0) == '?' && str.length == 2)
863 return new Xex.IntTerm (str.charCodeAt (1));
864 return new Xex.IntTerm (parseInt (node.firstChild.nodeValue));
866 Xex.IntTerm.prototype = proto;
869 Xex.StrTerm = function (str) { this.val = str; };
871 var proto = new Xex.Term ('string');
873 proto.Strval = function () { return this.val; };
874 proto.IsTrue = function () { return this.val.length > 0; }
875 proto.Clone = function () { return new Xex.StrTerm (this.val); }
876 proto.Parser = function (domain, node)
878 return new Xex.StrTerm (node.firstChild ? node.firstChild.nodeValue : '');
880 Xex.StrTerm.prototype = proto;
883 Xex.SymTerm = function (str) { this.val = str; };
885 var proto = new Xex.Term ('symbol');
886 proto.IsSymbol = true;
887 proto.IsTrue = function () { return this.val != 'nil'; }
888 proto.Clone = function () { return new Xex.SymTerm (this.val); }
889 proto.Parser = function (domain, node)
891 return new Xex.SymTerm (node.firstChild.nodeValue);
893 Xex.SymTerm.prototype = proto;
896 Xex.LstTerm = function (list) { this.val = list; };
898 var proto = new Xex.Term ('list');
900 proto.IsTrue = function () { return this.val.length > 0; }
901 proto.Clone = function () { return new Xex.LstTerm (this.val.slice (0)); }
903 proto.Equals = function (obj)
905 if (obj.type != 'list' || obj.val.length != this.val.length)
907 var i, len = this.val.length;
908 for (i = 0; i < len; i++)
909 if (! this.val[i].Equals (obj.val[i]))
914 proto.Parser = function (domain, node)
916 var list = Xex.Term.Parse (domain, node.firstElement (), null);
917 return new Xex.LstTerm (list);
920 proto.toString = function ()
922 var len = this.val.length;
927 for (var i = 0; i < len; i++)
928 str += this.val[i].toString ();
929 return str + '</list>';
931 Xex.LstTerm.prototype = proto;
935 var basic = new Xex.Domain ('basic', null, null);
937 function Fset (domain, vari, args)
940 throw new Xex.ErrTerm (Xex.Error.NoVariableName,
941 'No variable name to set');
942 vari.SetValue (args[0]);
946 function Fnot (domain, vari, args)
948 return (args[0].IsTrue () ? Xex.Zero : Xex.One);
951 function maybe_set_intvar (vari, n)
953 var term = new Xex.IntTerm (n);
955 vari.SetValue (term);
959 function Fadd (domain, vari, args)
961 var n = vari ? vari.val.Intval () : 0;
962 var len = args.length;
964 for (var i = 0; i < len; i++)
965 n += args[i].Intval ();
966 return maybe_set_intvar (vari, n);
969 function Fmul (domain, vari, args)
971 var n = vari ? vari.val.Intval () : 1;
972 for (var i = 0; i < args.length; i++)
973 n *= args[i].Intval ();
974 return maybe_set_intvar (vari, n);
977 function Fsub (domain, vari, args)
983 n = args[0].Intval ();
988 n = vari.val.Intval ();
991 while (i < args.length)
992 n -= args[i++].Intval ();
993 return maybe_set_intvar (vari, n);
996 function Fdiv (domain, vari, args)
1002 n = args[0].Intval ();
1007 n = vari.val.Intval ();
1010 while (i < args.length)
1011 n /= args[i++].Intval ();
1012 return maybe_set_intvar (vari, n);
1015 function Fmod (domain, vari, args)
1017 return maybe_set_intvar (vari, args[0].Intval () % args[1].Intval ());
1020 function Flogior (domain, vari, args)
1022 var n = vari == null ? 0 : vari.val;
1023 for (var i = 0; i < args.length; i++)
1025 return maybe_set_intvar (vari, n);
1028 function Flogand (domain, vari, args)
1033 Xex.Log ("logand arg args[0]" + args[0]);
1034 n = args[0].Intval ()
1039 Xex.Log ("logand arg var " + vari);
1040 n = vari.val.Intval ();
1043 while (n > 0 && i < args.length)
1045 Xex.Log ("logand arg " + args[i]);
1048 return maybe_set_intvar (vari, n);
1051 function Flsh (domain, vari, args)
1053 return maybe_set_intvar (vari, args[0].Intval () << args[1].Intval ());
1056 function Frsh (domain, vari, args)
1058 return maybe_set_intvar (vari, args[0].Intval () >> args[1].Intval ());
1061 function Fand (domain, vari, args)
1063 var len = args.length;
1064 for (var i = 0; i < len; i++)
1066 var result = args[i].Eval (domain);
1067 if (domain.Thrown ())
1069 if (! result.IsTrue ())
1075 function For (domain, vari, args)
1077 var len = args.length;
1078 for (var i = 0; i < len; i++)
1080 var result = args[i].Eval (domain);
1081 if (domain.Thrown ())
1083 if (result.IsTrue ())
1089 function Feq (domain, vari, args)
1091 for (var i = 1; i < args.length; i++)
1092 if (! args[i - 1].Equals (args[i]))
1097 function Fnoteq (domain, vari, args)
1099 return (Feq (domain, vari, args) == Xex.One ? Xex.Zero : Xex.One);
1102 function Flt (domain, vari, args)
1104 var n = args[0].Intval ();
1106 for (var i = 1; i < args.length; i++)
1108 var n1 = args[i].Intval ();
1116 function Fle (domain, vari, args)
1118 var n = args[0].Intval ();
1119 for (var i = 1; i < args.length; i++)
1121 var n1 = args[i].Intval ();
1129 function Fgt (domain, vari, args)
1131 var n = args[0].Intval ();
1132 for (var i = 1; i < args.length; i++)
1134 var n1 = args[i].Intval ();
1142 function Fge (domain, vari, args)
1144 var n = args[0].Intval ();
1145 for (var i = 1; i < args.length; i++)
1147 var n1 = args[i].Intval ();
1155 function Fprogn (domain, vari, args)
1157 var result = Xex.One;
1158 var len = args.length;
1160 for (var i = 0; i < len; i++)
1162 result = args[i].Eval (domain);
1163 if (domain.Thrown ())
1169 function Fif (domain, vari, args)
1171 var result = args[0].Eval (domain);
1173 if (domain.Thrown ())
1175 if (result.IsTrue ())
1176 return args[1].Eval (domain);
1177 if (args.length == 2)
1179 return args[2].Eval (domain);
1182 function Fcond (domain, vari, args)
1184 for (var i = 0; i < args.length; i++)
1187 var result = list.val[0].Eval (domain);
1188 if (result.IsTrue ())
1190 for (var j = 1; j < list.val.length; j++)
1193 result = list.val[j].Eval (domain);
1195 if (domain.Thrown ())
1204 function eval_terms (domain, terms, idx)
1206 var result = Xex.Zero;
1207 domain.caught = false;
1208 for (var i = idx; i < terms.length; i++)
1210 result = terms[i].Eval (domain);
1211 if (domain.Thrown ())
1217 function Fcatch (domain, vari, args)
1222 if (args[0].IsError)
1225 result = eval_terms (domain, args, 1);
1227 if (e instanceof Xex.ErrTerm)
1229 if (! args[0].Matches (e))
1237 else if (args[0].IsSymbol)
1240 domain.Catch (args[0].val);
1241 result = eval_terms (domain, args, 1);
1245 vari.SetValue (result);
1253 throw new Xex.ErrTerm (Xex.Error.WrongArgument,
1254 "Not a symbol nor an error: " + args[0]);
1257 function Fthrow (domain, vari, args)
1259 if (args[0].IsSymbl)
1261 domain.ThrowSymbol (args[0]);
1262 return (args[args.length - 1]);
1264 if (args[0].IsError)
1268 throw new Xex.ErrTerm (Xex.Error.WrongArgument,
1269 "Not a symbol nor an error:" + args[0]);
1272 Xex.BasicDomain = basic;
1274 basic.DefSubr (Fset, "set", true, 1, 1);
1275 basic.DefAlias ("=", "set");
1276 basic.DefSubr (Fnot, "not", false, 1, 1);
1277 basic.DefAlias ("!", "not");
1278 basic.DefSubr (Fadd, "add", true, 1, -1);
1279 basic.DefSubr (Fmul, "mul", true, 1, -1);
1280 basic.DefAlias ("*", "mul");
1281 basic.DefSubr (Fsub, "sub", true, 1, -1);
1282 basic.DefAlias ("-", "sub");
1283 basic.DefSubr (Fdiv, "div", true, 1, -1);
1284 basic.DefAlias ("/", "div");
1285 basic.DefSubr (Fmod, "mod", true, 1, 2);
1286 basic.DefAlias ("%", "mod");
1287 basic.DefSubr (Flogior, "logior", true, 1, -1);
1288 basic.DefAlias ('|', "logior");
1289 basic.DefSubr (Flogand, "logand", true, 1, -1);
1290 basic.DefAlias ("&", "logand");
1291 basic.DefSubr (Flsh, "lsh", true, 1, 2);
1292 basic.DefAlias ("<<", "lsh");
1293 basic.DefSubr (Frsh, "rsh", true, 1, 2);
1294 basic.DefAlias (">>", "rsh");
1295 basic.DefSubr (Feq, "eq", false, 2, -1);
1296 basic.DefAlias ("==", "eq");
1297 basic.DefSubr (Fnoteq, "noteq", false, 2, 2);
1298 basic.DefAlias ("!=", "noteq");
1299 basic.DefSubr (Flt, "lt", false, 2, -1);
1300 basic.DefAlias ("<", "lt");
1301 basic.DefSubr (Fle, "le", false, 2, -1);
1302 basic.DefAlias ("<=", "le");
1303 basic.DefSubr (Fgt, "gt", false, 2, -1);
1304 basic.DefAlias (">", "gt");
1305 basic.DefSubr (Fge, "ge", false, 2, -1);
1306 basic.DefAlias (">=", "ge");
1307 basic.DefSubr (Fthrow, "throw", false, 1, 2);
1309 //basic.DefSubr (Fappend, "append", true, 0, -1);
1310 //basic.DefSubr (Fconcat, "concat", true, 0, -1);
1311 //basic.DefSubr (Fnth, "nth", false, 2, 2);
1312 //basic.DefSubr (Fcopy, "copy", false, 1, 1);
1313 //basic.DefSubr (Fins, "ins", true, 2, 2);
1314 //basic.DefSubr (Fdel, "del", true, 2, 2);
1315 //basic.DefSubr (Feval, "eval", false, 1, 1);
1316 //basic.DefSubr (Fbreak, "break", false, 0, 1);
1317 //basic.DefSubr (Freturn, "return", false, 0, 1);
1318 //basic.DefSubr (Fthrow, "throw", false, 1, 2);
1320 basic.DefSpecial (Fand, "and", false, 1, -1);
1321 basic.DefAlias ("&&", "and");
1322 basic.DefSpecial (For, "or", false, 1, -1);
1323 basic.DefAlias ("||", "or");
1324 basic.DefSpecial (Fprogn, "progn", false, 1, -1);
1325 basic.DefAlias ("expr", "progn");
1326 basic.DefSpecial (Fif, "if", false, 2, 3);
1327 //basic.DefSpecial (Fwhen, "when", false, 1, -1);
1328 //basic.DefSpecial (Floop, "loop", false, 1, -1);
1329 //basic.DefSpecial (Fwhile, "while", false, 1, -1);
1330 basic.DefSpecial (Fcond, "cond", false, 1, -1);
1331 //basic.DefSpecial (Fforeach, "foreach", true, 2, -1);
1332 //basic.DefSpecial (Fquote, "quote", false, 1, 1);
1333 //basic.DefSpecial (Ftype, "type", false, 1, 1);
1334 basic.DefSpecial (Fcatch, "catch", true, 2, -1);
1336 basic.DefType (Xex.Funcall.prototype);
1337 basic.DefType (Xex.Varref.prototype);
1338 basic.DefType (Xex.ErrTerm.prototype);
1339 basic.DefType (Xex.IntTerm.prototype);
1340 basic.DefType (Xex.StrTerm.prototype);
1341 basic.DefType (Xex.SymTerm.prototype);
1342 basic.DefType (Xex.LstTerm.prototype);
1346 Xex.Zero = new Xex.IntTerm (0);
1347 Xex.One = new Xex.IntTerm (1);
1348 Xex.nil = new Xex.SymTerm ('nil');
1350 Xex.Load = function (server, file)
1352 var obj = new XMLHttpRequest ();
1353 var url = server ? server + '/' + file : file;
1354 obj.open ('GET', url, false);
1355 obj.overrideMimeType ('text/xml');
1357 return (obj.responseXML && obj.responseXML.firstChild);