namespace System.Xml.Expression
{
- public class XmlName : IEquatable<XmlName>
+ public class Xexpression
{
- private static NameTable nt = new NameTable ();
+ public static int debug_level = 0;
- private object name;
+ public struct Name : IEquatable<Name>
+ {
+ private static NameTable nt = new NameTable ();
- private XmlName (string str)
- {
- name = nt.Add (str);
- }
+ private string name;
- public static implicit operator XmlName (string str)
- {
- return new XmlName (str);
- }
+ public Name (string str)
+ {
+ name = nt.Add (str);
+ }
- public static bool operator== (object obj, XmlName nam)
+ public static implicit operator Name (string str)
{
- return obj == nam.name;
+ return new Name (str);
}
- public static bool operator!= (object obj, XmlName nam)
+ public static implicit operator string (Name name)
{
- return obj != nam.name;
+ return name.name;
}
- public bool Equals (XmlName other) { return name == other.name; }
- public override bool Equals (object obj) { return obj == name; }
- public override int GetHashCode ()
- {
- return ((string) name).GetHashCode ();
- }
-
- public static NameTable Table { get { return nt; } }
- }
+ public static bool operator== (Name n1, Name n2)
+ {
+ return (object) n1.name == (object) n2.name;
+ }
- public class Xex
- {
- private static NameTable nt = new NameTable ();
+ public static bool operator!= (Name n1, Name n2)
+ {
+ return (object) n1.name != (object) n2.name;
+ }
- public static object Name (string str)
- {
- return nt.Add (str);
- }
+ public static bool operator== (Name n1, string n2)
+ {
+ return (object) n1.name == (object) n2;
+ }
- public static NameTable Table { get { return nt; } }
+ public static bool operator!= (Name n1, string n2)
+ {
+ return (object) n1.name != (object) n2;
+ }
- private static object Nvar = Name ("var");
- private static object Ndefun = Name ("defun");
- private static object Ncond = Name ("cond");
- private static object Nprogn = Name ("progn");
- private static object Nwhen = Name ("when");
+ public static bool operator== (string n1, Name n2)
+ {
+ return (object) n1 == (object) n2.name;
+ }
- public class Domain
- {
- private Domain parent;
- internal Dictionary<object,functions = new MPlist ();
- internal MPlist bindings = new MPlist ();
- private Stack<MPlist> boundaries = new Stack<MPlist> ();
- internal Translator translator;
- public object context;
+ public static bool operator!= (string n1, Name n2)
+ {
+ return (object) n1 != (object) n2.name;
+ }
- internal Domain ()
+ public bool Equals (Name name)
{
- boundaries.Push (bindings);
+ return Object.ReferenceEquals (this.name, name.name);
}
- public Domain (object context) : this (basic, context) { }
-
- public Domain (Domain parent, object context)
+ public override bool Equals (object obj)
{
- this.parent = parent;
- this.context = context;
- boundaries.Push (bindings);
+ return Object.ReferenceEquals (this.name, obj);
}
- public void AddTranslator (Translator translator)
+ public override int GetHashCode ()
{
- if (this.translator == null)
- this.translator = translator;
- else
- this.translator += translator;
+ return name.GetHashCode ();
}
- public void Bind (MSymbol sym, object value)
- {
- bindings = bindings.Cons (sym, value);
- }
+ public static NameTable Table { get { return nt; } }
- public MPlist SetBoundary ()
- {
- boundaries.Push (bindings);
- return bindings;
- }
+ public override string ToString () { return name; }
+ }
- public void UnboundTo (MPlist boundary)
- {
- while (boundary != boundaries.Pop ());
- while (bindings != boundary)
- bindings = bindings.next;
- }
+ private static Name Nexpr = "expr";
+
+ private static Name Nfuncall = "funcall";
+ private static Name Nvarref = "varref";
+ private static Name Ninteger = "integer";
+ private static Name Nstring = "string";
+ private static Name Nsymbol = "symbol";
+ private static Name Nlist = "list";
+
+ private static Name Ndefun = "defun";
+ private static Name Nfname = "fname";
+ private static Name Nargs = "args";
+ private static Name Nargs_unevalled = "args-unevalled";
+ private static Name Nfixed = "fixed";
+ private static Name Noptional = "optional";
+ private static Name Nrest = "rest";
+
+ private static Name Ndefvar = "defvar";
+ private static Name Nvname = "vname";
+ private static Name Ndescription = "description";
+ private static Name Nrange = "range";
+
+ private static Name Nprogn = "progn";
+ private static Name Nloop = "loop";
+ private static Name Nfunction = "function";
+
+ internal abstract class Function
+ {
+ public Name name;
+ public int min_arg, max_arg;
- public void Defun (string name, Builtin builtin, int min_arg, int max_arg)
- {
- Defun (name, builtin, min_arg, max_arg, false);
- }
+ public Function () { }
- public void Defun (string name, Builtin builtin, int min_arg, int max_arg,
- bool specialp)
+ public Function (Name name, int min_arg, int max_arg)
{
- MSymbol sym = name;
- Function func = (Function) functions.Get (sym);
-
- if (func != null)
- {
- if (func.min_arg < min_arg || func.max_arg > max_arg)
- throw new Exception ("Incompatible argument numbers to override: "
- + name);
- func.builtin = builtin;
- func.lambda = null;
- func.min_arg = min_arg;
- func.max_arg = max_arg;
- func.specialp = specialp;
- }
- else
- {
- func = new Function (sym, builtin, min_arg, max_arg, specialp);
- functions = functions.Cons (sym, func);
- }
+ this.name = name;
+ this.min_arg = min_arg;
+ this.max_arg = max_arg;
}
- public void Defun (MSymbol sym, MPlist args, MPlist body)
- {
- Function func = (Function) functions.Get (sym);
+ public abstract Term Call (Domain domain, Variable vari, Term[] args);
- if (func != null)
- {
- int nargs = args == null ? 0 : args.Count;
-
- if (func.min_arg < nargs || func.max_arg > nargs)
- throw new Exception ("Incompatible argument numbers to override: "
- + sym);
- func.lambda.SetArgs (args);
- func.lambda.SetBody (body, this);
- func.builtin = null;
- }
- else
- {
- func = new Function (sym, args, body, this);
- functions = functions.Cons (sym, func);
- }
- }
-
- public void Defun (XmlNode node)
+ public override string ToString ()
{
- MSymbol sym = node.Attributes["id"].Value;
- Function func = (Function) functions.Get (sym);
-
- if (func != null)
- {
- XmlNode args = node.FirstChild;
- int nargs = args.Name == "args" ? args.ChildNodes.Count : 0;
-
- if (func.min_arg < nargs || func.max_arg > nargs)
- throw new Exception ("Incompatible argument numbers to override: "
- + sym);
- func.lambda.Set (node, this);
- func.builtin = null;
- }
- else
- {
- func = new Function (sym, node, this);
- functions = functions.Cons (sym, func);
- }
+ return name;
}
- internal Function GetFunc (MSymbol name)
+ internal class Subroutine : Function
{
- Function func = (Function) functions.Get (name);
+ public Builtin builtin;
+ public bool setvar;
- if (func == null)
+ public Subroutine (Builtin builtin, Name name, bool setvar,
+ int min_arg, int max_arg)
+ : base (name, min_arg, max_arg)
{
- if (parent != null)
- return parent.GetFunc (name);
- throw new Exception ("Unknown function: " + name);
+ this.builtin = builtin;
}
- return func;
- }
- public bool CopyFunc (Domain domain, MSymbol name)
- {
- Function func = (Function) functions.Get (name);
- if (func == null)
- return false;
- domain.functions = domain.functions.Cons (name, func);
- return true;
- }
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ Term[] newargs = new Term[args.Length];
- public void CopyFunc (Domain domain)
- {
- foreach (MPlist p in functions)
- domain.functions = domain.functions.Cons (p.key, p.val);
+ for (int i = 0; i < args.Length; i++)
+ newargs[i] = args[i].Eval (domain);
+ return builtin (domain, vari, newargs);
+ }
}
- public object GetValue (MSymbol name)
+ internal class SpecialForm : Function
{
- MPlist slot = bindings.Find (name);
+ public Builtin builtin;
- if (slot == null)
+ public SpecialForm (Builtin builtin, Name name,
+ int min_arg, int max_arg)
+ : base (name, min_arg, max_arg)
{
- if (parent != null)
- return parent.GetValue (name);
- throw new Exception ("Unbound variable: " + name);
+ this.builtin = builtin;
}
- return slot.val;
+
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ return builtin (domain, vari, args);
+ }
}
- public object SetValue (MSymbol name, object val)
+ internal class Lambda : Function
{
- MPlist boundary = boundaries.Peek ();
+ internal bool args_evalled;
+ internal Variable[] args;
+ internal Term[] body;
- for (MPlist plist = bindings; plist != boundary; plist = plist.next)
- if (plist.key == name)
+ public Lambda (XmlNode node, Domain domain)
+ {
+ int nfixed = 0;
+ int noptional = 0;
+ int nrest = 0;
+ name = node.Attributes[Nfname].Value;
+
+ node = node.FirstChild;
+ if (node != null
+ && (node.Name == Nargs || node.Name == Nargs_unevalled))
{
- plist.val = val;
- return val;
+ XmlNode n;
+ args_evalled = node.Name == Nargs;
+ for (n = node.FirstChild; n != null; n = n.NextSibling)
+ {
+ if (n.Name == Nfixed)
+ nfixed++;
+ else if (n.Name == Noptional)
+ noptional++;
+ else if (n.Name == Nrest)
+ nrest++;
+ else
+ throw new Exception ("Invalid argument type: " + n);
+ }
+ min_arg = nfixed;
+ max_arg = nfixed + noptional + nrest;
+ args = new Variable[max_arg];
+ n = node.FirstChild;
+ for (int i = 0; i < max_arg; n = n.NextSibling)
+ args[i++] = domain.Defvar ((Name) n.Attributes[0].Value);
+ if (nrest == 1)
+ max_arg = - max_arg;
}
- bindings = bindings.Cons (name, val);
- return val;
- }
+ else
+ {
+ min_arg = max_arg = 0;
+ }
+ }
- public bool IsBound (MSymbol name)
- {
- return (bindings.Find (name) != null);
+ public void SetBody (XmlNode node, Domain domain)
+ {
+ for (node = node.FirstChild; node != null; node = node.NextSibling)
+ if (node.Name != Ndescription
+ && node.Name != Nargs
+ && node.Name != Nargs_unevalled)
+ break;
+ int nterms = 0;
+ for (XmlNode n = node; n != null; n = n.NextSibling)
+ nterms++;
+ if (nterms > 0)
+ {
+ body = new Term[nterms];
+ for (nterms = 0; node != null; node = node.NextSibling, nterms++)
+ body[nterms] = new Term (node, domain);
+ }
+ }
+
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ Bindings current = domain.bindings;
+ Term result = Zero;
+
+ try {
+ int i;
+ if (args_evalled)
+ {
+ Term[] newargs = new Term[args.Length];
+ for (i = 0; i < min_arg; i++)
+ newargs[i] = args[i].Eval (domain);
+ args = newargs;
+ }
+ for (i = 0; i < min_arg; i++)
+ domain.Bind (this.args[i], args[i]);
+ if (body != null)
+ foreach (Term term in body)
+ result = term.Eval (domain);
+ } finally {
+ domain.UnboundTo (current);
+ }
+ return result;
+ }
}
+ }
+
+ public abstract class Variable
+ {
+ public readonly Name name;
+ internal Term val;
- public void Translate (MPlist plist)
+ public Variable (Name name, Term term)
{
- if (parent != null)
- parent.Translate (plist);
- if (translator != null)
- for (MPlist p = plist; ! p.IsEmpty; p = p.next)
- translator (p, this);
+ this.name = name;
+ Value = term;
}
- public override string ToString ()
+ public Term Value
{
- string str = "<(functions";
- foreach (MPlist p in functions)
- str += " " + p.key;
- str += ") (bindings " + bindings + ")";
- if (context != null)
- str += " (" + context + ")";
- str += ">";
- return str;
+ get { return val; }
+ set
+ {
+ if (! ValueP (value))
+ throw new Exception ("Invalid value of " + name + ": " + value);
+ val = value;
+ }
}
- }
- public delegate object Builtin (MExpression[] args, Domain domain);
- public delegate void Translator (MPlist plist, Domain domain);
+ public abstract bool ValueP (Term term);
- internal class Function
- {
- internal class Lambda
- {
- internal MSymbol[] args;
- internal MExpression[] body;
+ public override string ToString () { return name + "(" + val + ")"; }
- public Lambda (MPlist args, MPlist body, Domain domain)
+ internal class Int : Variable
+ {
+ public struct Range
{
- SetArgs (args);
- SetBody (body, domain);
+ public int from, to;
}
- public Lambda (XmlNode node, Domain domain)
- {
- Set (node, domain);
- }
+ public Range[] ranges;
- public void SetArgs (MPlist args)
- {
- int len = args == null ? 0 : args.Count;
+ public Int (Name name, int i) : base (name, new Term (i)) { }
- if (this.args == null)
- this.args = new MSymbol[len];
- for (int i = 0; i < len; i++, args = args.next)
- this.args[i] = args.Symbol;
- }
-
- public void SetBody (MPlist body, Domain domain)
+ public override bool ValueP (Term term)
{
- int len = body == null ? 0 : body.Count;
- if (this.body == null)
- this.body = new MExpression[len];
- for (int i = 0; i < len; i++, body = body.next)
- {
- domain.Translate (body);
- this.body[i] = new MExpression (body.key, body.val, domain);
- }
- }
+ int i;
- public void Set (XmlNode node, Domain domain)
- {
- XmlNodeList body = node.ChildNodes;
- int idx = 0;
-
- if (body[0].Name == "args")
- {
- XmlNodeList args = body[0].ChildNodes;
- if (this.args == null)
- this.args = new MSymbol[args.Count];
- for (int i = 0; i < args.Count; i++)
- this.args[i] = args[i].InnerText;
- idx++;
- }
- else if (this.args == null)
- this.args = new MSymbol[0];
- if (this.body == null)
- this.body = new MExpression[body.Count - idx];
- for (int i = 0; idx < body.Count; i++, idx++)
- this.body[i] = new MExpression (body[idx], domain);
+ if (term.objval != null)
+ return false;
+ if (ranges == null)
+ return true;
+ i = term.intval;
+ foreach (Range r in ranges)
+ if (i >= r.from && i <= r.to)
+ return true;
+ return false;
}
}
- public readonly MSymbol Name;
- public Builtin builtin;
- public int min_arg, max_arg;
- internal Lambda lambda;
- public bool specialp = false;
+ internal class Str : Variable
+ {
+ public string[] ranges;
- internal static Function ignore, varref, block;
+ public Str (Name name, string str) : base (name, new Term (str)) { }
- public Function (MSymbol name, Builtin builtin,
- int min_arg, int max_arg, bool specialp)
- {
- Name = name;
- this.builtin = builtin;
- this.min_arg = min_arg;
- this.max_arg = max_arg;
- this.specialp = specialp;
+ public override bool ValueP (Term term)
+ {
+ if (! (term.objval is string))
+ return false;
+ if (ranges == null)
+ return true;
+ string str = (string) term.objval;
+ foreach (string s in ranges)
+ if (s == str)
+ return true;
+ return false;
+ }
}
- internal Function (MSymbol name, MPlist args, MPlist body,
- Domain domain)
+ internal class Misc : Variable
{
- Name = name;
- lambda = new Lambda (args, body, domain);
- this.min_arg = this.max_arg = lambda.args.Length;
- }
+ public Misc (Name name, Term term) : base (name, term) { }
- internal Function (MSymbol name, XmlNode node, Domain domain)
- {
- Name = name;
- lambda = new Lambda (node, domain);
- this.min_arg = this.max_arg = lambda.args.Length;
+ public override bool ValueP (Term term) { return true; }
}
+ }
- private Function ()
+ internal class Bindings
+ {
+ private Variable vari;
+ private Term old_value;
+ private Bindings next;
+
+ private Bindings (Variable vari)
{
- Name = MSymbol.nil;
+ this.vari = vari;
+ old_value = vari.val;
}
-
- static Function ()
+
+ public static Bindings Bind (Bindings bindings, Variable vari, Term val)
{
- ignore = new Function ();
- varref = new Function (Mvarref, get_value, 1, 1, true);
- block = new Function (Mprogn, progn, 0, -1, true);
+ Bindings b = new Bindings (vari);
+
+ b.vari.Value = val;
+ b.next = bindings;
+ return b;
}
- private static object get_value (MExpression[] args, Domain domain)
+ internal Bindings UnboundTo (Bindings boundary)
{
- return domain.GetValue ((MSymbol) args[0].val);
+ for (Bindings b = this; b != boundary; b = b.next)
+ b.vari.val = b.old_value;
+ return boundary;
}
- public object Call (MExpression[] args, Domain domain)
+ public override string ToString ()
{
- if (builtin != null)
- {
- if (! specialp)
- foreach (MExpression e in args)
- e.Eval (domain);
- return builtin (args, domain);
- }
- if (lambda == null)
- return null;
- MPlist orig_bindings = domain.bindings;
- object result = false;
- try {
- int i = 0;
- foreach (MSymbol arg in lambda.args)
- domain.Bind (arg, args[i++].Eval (domain));
- foreach (MExpression e in lambda.body)
- result = e.Eval (domain);
- } finally {
- domain.bindings = orig_bindings;
- }
- return result;
+ string str = "(bindings";
+ for (Bindings b = this; b != null; b = b.next)
+ str += " " + vari.name + "=" + b.old_value;
+ return str + ")";
}
}
- private static Domain basic;
-
- static MExpression ()
+#if false
+ internal class ThrowException : Exception
{
- basic = new Domain ();
-
- basic.Defun ("set", set_value, 2, 2, true);
- basic.Defun ("=", set_value, 2, 2, true);
- basic.Defun ("!", not, 1, 1, false);
- basic.Defun ("+", plus, 2, -1, false);
- basic.Defun ("*", multi, 2, -1, false);
- basic.Defun ("-", minus, 1, -1, false);
- basic.Defun ("/", divide, 2, -1, false);
- basic.Defun ("%", percent, 2, -1, false);
- basic.Defun ("|", logior, 2, -1, false);
- basic.Defun ("&", logand, 2, -1, false);
- basic.Defun ("+=", pluseq, 2, -1, true);
- basic.Defun ("*=", multieq, 2, -1, true);
- basic.Defun ("-=", minuseq, 2, -1, true);
- basic.Defun ("/=", divideeq, 2, -1, true);
- basic.Defun ("%=", percenteq, 2, -1, true);
- basic.Defun ("|=", logioreq, 2, -1, true);
- basic.Defun ("&=", logandeq, 2, -1, true);
- basic.Defun ("<<", lshift, 2, 2, false);
- basic.Defun (">>", rshift, 2, 2, false);
- basic.Defun ("<<=", lshifteq, 2, 2, true);
- basic.Defun (">>=", rshifteq, 2, 2, true);
- basic.Defun ("==", eq, 2, -1, false);
- basic.Defun ("!=", noteq, 2, 2, false);
- basic.Defun ("<", less, 2, -1, false);
- basic.Defun ("<=", lesseq, 2, -1, false);
- basic.Defun (">", more, 2, -1, false);
- basic.Defun (">=", moreeq, 2, -1, false);
- basic.Defun ("progn", progn, 0, -1, true);
- basic.Defun ("if", ifclause, 2, -1, true);
- basic.Defun ("when", whenclause, 1, -1, true);
- basic.Defun ("while", whileclause, 1, -1, true);
+ Name tag;
+ public object value;
- basic.AddTranslator (new Translator (translate_cond));
- }
-
- private static object set_value (MExpression[] args, Domain domain)
- {
- return domain.SetValue ((MSymbol) args[0].args[0].val,
- args[1].Eval (domain));
+ public ThrowException (Name tag, object value) : base ()
+ {
+ this.tag = tag;
+ this.value = value;
+ }
}
+#endif
- private static object not (MExpression[] args, Domain domain)
+ internal struct CatchTag
{
- if (args[0].val is int)
- return (int) args[0].val == 0;
- if (args[0].val is bool)
- return ! ((bool) args[0].val);
- return true;
- }
+ public readonly Name name;
+ public readonly int count;
- private static object plus (MExpression[] args, Domain domain)
- {
- if (args[0].val is int)
+ public CatchTag (Name name, int count)
{
- int n = 0;
- foreach (MExpression e in args)
- n += (int) e.val;
- return n;
+ this.name = name;
+ this.count = count;
}
- else if (args[0].val is MText)
- {
- MText mt = new MText ();
- foreach (MExpression e in args)
- mt += (MText) e.val;
- return mt;
- }
- throw new Exception ("Not an integer nor MText: " + args[0].val);
}
- private static object multi (MExpression[] args, Domain domain)
+ public class Domain
+ {
+ public object context;
+ public int depth = 0;
+
+ internal Dictionary<Name, Function> functions;
+ internal Dictionary<Name, Variable> variables;
+ internal Bindings bindings;
+ internal Stack<CatchTag> catch_list = new Stack<CatchTag> ();
+ private int catch_count = 0;
+
+ internal Domain ()
{
- int n = 1;
- foreach (MExpression e in args)
- n *= (int) e.val;
- return n;
+ functions = new Dictionary<Name, Function> ();
+ variables = new Dictionary<Name, Variable> ();
}
- private static object minus (MExpression[] args, Domain domain)
+ public Domain (object context) : this (basic, context)
{
- int n = (int) args[0].val;
- if (args.Length == 1)
- return - n;
- for (int i = 1; i < args.Length; i++)
- n -= (int) args[i].val;
- return n;
}
- private static object divide (MExpression[] args, Domain domain)
+ public Domain (Domain parent, object context)
{
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i].val;
- return n;
+ functions = new Dictionary<Name, Function> (parent.functions);
+ variables = new Dictionary<Name, Variable> (parent.variables);
+ this.context = context;
}
- private static object percent (MExpression[] args, Domain domain)
+ internal void Bind (Variable vari, Term value)
{
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- n %= (int) args[i].val;
- return n;
+ bindings = Bindings.Bind (bindings, vari, value);
}
- private static object logior (MExpression[] args, Domain domain)
+ internal void UnboundTo (Bindings boundary)
{
- int n = 0;
- foreach (MExpression e in args)
- n |= (int) e.val;
- return n;
+ if (bindings != null)
+ bindings = bindings.UnboundTo (boundary);
}
- private static object logand (MExpression[] args, Domain domain)
+ internal void Catch (Name name)
{
- int n = 0;
- foreach (MExpression e in args)
- n &= (int) e.val;
- return n;
+ catch_list.Push (new CatchTag (name, catchcount++));
}
- private static object pluseq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- object val = domain.GetValue (sym);
+ internal bool Catched {
+ get { return catch_list.Peek ().count == catchcount; }
+ }
- if (val is int)
- {
- int n = (int) val;
- for (int i = 1; i < args.Length; i++)
- n += (int) args[i].Eval (domain);
- val = n;
- }
- else if (val is MText)
+ internal void ThrowReturn ()
+ {
+ CatchTag tag = catch_list.Peek ();
+ while (tag.name != Nreturn)
{
- MText mt = (MText) val;
- for (int i = 1; i < args.Length; i++)
- mt.Cat ((MText) args[i].Eval (domain));
- val = mt;
+ catch_list.Pop ();
+ tag = catch_list.Peek ();
}
- domain.SetValue (sym, val);
- return val;
+ catchcount = tag.count;
}
- private static object multieq (MExpression[] args, Domain domain)
+ internal void ThrowBreak ()
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n *= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ catch_list.Peek ().count = catchcount;
}
- private static object minuseq (MExpression[] args, Domain domain)
+ internal void Uncatch ()
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n -= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ catch_list.Pop ();
}
- private static object divideeq (MExpression[] args, Domain domain)
+ public void DefSubr (Builtin builtin, string str, bool setvar,
+ int min_arg, int max_arg, params string[] aliases)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ Name name = str;
+ Function func = new Function.Subroutine (builtin, name, setvar,
+ min_arg, max_arg);
+ functions[name] = func;
+ foreach (string a in aliases)
+ functions[(Name) a] = func;
}
- private static object percenteq (MExpression[] args, Domain domain)
+ public void DefSpecial (Builtin builtin, string str,
+ int min_arg, int max_arg,
+ params string[] aliases)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n %= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ Name name = str;
+ Function func = new Function.SpecialForm (builtin, name,
+ min_arg, max_arg);
+ functions[name] = func;
+ foreach (string a in aliases)
+ functions[(Name) a] = func;
}
- private static object logioreq (MExpression[] args, Domain domain)
+ public void DefAlias (string alias, string str)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n |= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ functions[(Name) alias] = functions[(Name) str];
}
- private static object logandeq (MExpression[] args, Domain domain)
+ internal Function.Lambda RegisterFunction (XmlNode node)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Function.Lambda lambda = new Function.Lambda (node, this);
- for (int i = 1; i < args.Length; i++)
- n &= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ functions[lambda.name] = lambda;
+ return lambda;
}
- private static object lshift (MExpression[] args, Domain domain)
+ internal Function Defun (XmlNode node)
{
- return (int) args[0].val << (int) args[1].val;
+ Name name = node.Attributes[Nfname].Value;
+ Function func;
+
+ if (! functions.TryGetValue (name, out func))
+ func = RegisterFunction (node);
+ ((Function.Lambda) func).SetBody (node, this);
+ return func;
}
- private static object lshifteq (MExpression[] args, Domain domain)
+ public void Defvar (XmlNode node)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Name name = node.Attributes[0].Value;
+ Variable vari;
- n <<= (int) args[1].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ node = node.FirstChild;
+ if (node.Name == Ndescription)
+ node = node.NextSibling;
+ if (node != null)
+ {
+ Name type = node.Name;
+ XmlNodeList range_list = null;
+ int nranges = 0;
+ string val = node.InnerText;
+
+ node = node.NextSibling;
+ if (node != null)
+ {
+ range_list = node.ChildNodes;
+ nranges = range_list.Count;
+ }
+
+ if (type == Ninteger)
+ {
+ Variable.Int vi = new Variable.Int (name, parse_integer (val));
+ if (range_list != null)
+ {
+ vi.ranges = new Variable.Int.Range[nranges];
+
+ for (int i = 0; i < nranges; i++)
+ {
+ XmlNode n = range_list[i];
+
+ if (n.Name == Nrange)
+ {
+ vi.ranges[i].from =
+ parse_integer (n.FirstChild.InnerText);
+ vi.ranges[i].to =
+ parse_integer (n.LastChild.InnerText);
+ }
+ else
+ {
+ int num = parse_integer (n.InnerText);
+ vi.ranges[i].from = vi.ranges[i].to = num;
+ }
+ }
+ }
+ vari = vi;
+ }
+ else if (type == Nstring)
+ {
+ Variable.Str vs = new Variable.Str (name, val);
+ if (range_list != null)
+ vs.ranges = new string[nranges];
+ for (int i = 0; i < nranges; i++)
+ vs.ranges[i] = range_list[i].Value;
+ vari = vs;
+ }
+ else
+ throw new Exception ("Unknown type: " + type);
+ }
+ else
+ vari = new Variable.Misc (name, Zero);
+ variables[name] = vari;
}
- private static object rshift (MExpression[] args, Domain domain)
+ internal Variable Defvar (Name name)
{
- return (int) args[0].val >> (int) args[1].val;
+ Variable vari = new Variable.Misc (name, Zero);
+ variables[name] = vari;
+ return vari;
}
- private static object rshifteq (MExpression[] args, Domain domain)
+ internal Function GetFunc (Name name)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Function func;
- n >>= (int) args[1].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ if (! functions.TryGetValue (name, out func))
+ throw new Exception ("Unknown function: " + name);
+ return func;
}
- private static object eq (MExpression[] args, Domain domain)
+ public bool CopyFunc (Domain domain, Name name)
{
- int n = (int) args[0].val;
+ Function func = GetFunc (name);
- for (int i = 1; i < args.Length; i++)
- if (n != (int) args[i].val)
- return false;
+ domain.functions[name] = func;
return true;
}
- private static object noteq (MExpression[] args, Domain domain)
+ public void CopyFunc (Domain domain)
{
- return ((int) args[0].val != (int) args[1].val);
+ foreach (KeyValuePair<Name, Function> kv in functions)
+ domain.functions[kv.Key] = kv.Value;
}
- private static object less (MExpression[] args, Domain domain)
+ internal Variable GetVar (Name name)
{
- int n = (int) args[0].val;
+ Variable vari;
- for (int i = 1; i < args.Length; i++)
- {
- int n1 = (int) args[i].val;
- if (n >= n1)
- return false;
- n = n1;
- }
- return true;
+ if (! variables.TryGetValue (name, out vari))
+ variables[name] = vari = new Variable.Misc (name, Zero);
+ return vari;
}
- private static object lesseq (MExpression[] args, Domain domain)
+ public override string ToString ()
{
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- {
- int n1 = (int) args[i].val;
- if (n > n1)
- return false;
- n = n1;
- }
- return true;
+ string str = "<(functions";
+ foreach (KeyValuePair<Name, Function> kv in functions)
+ str += " " + kv.Key;
+ str += ") (variabls";
+ foreach (KeyValuePair<Name, Variable> kv in variables)
+ str += " " + kv.Key;
+ str += ")";
+ if (bindings != null)
+ str += " " + bindings;
+ if (context != null)
+ str += " (" + context + ")";
+ str += ">";
+ return str;
}
- private static object more (MExpression[] args, Domain domain)
+ internal void DebugWrite (bool head, string fmt, params string[] arg)
{
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
+ if (debug_level > depth)
{
- int n1 = (int) args[i].val;
- if (n <= n1)
- return false;
- n = n1;
+ if (head)
+ {
+ Console.WriteLine ();
+ for (int i = 0; i < depth; i++)
+ Console.Write (" ");
+ }
+ Console.Write (fmt, arg);
}
- return true;
}
+ }
- private static object moreeq (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- {
- int n1 = (int) args[i].val;
- if (n < n1)
- return false;
- n = n1;
- }
- return true;
- }
+ public delegate Term Builtin (Domain domain, Variable vari, Term[] args);
- private static object progn (MExpression[] args, Domain domain)
- {
- object result = false;
+ private static Domain basic = new Domain ();
- foreach (MExpression e in args)
- result = e.Eval (domain);
- return result;
- }
+ internal static Function Fprogn;
- private static bool check_condition (MExpression condition, Domain domain)
- {
- object result = condition.Eval (domain);
- return (result is bool ? (bool) result
- : result is int ? ((int) result) != 0
- : true);
- }
+ static Xexpression ()
+ {
+ basic.DefSubr (set_value, "set", true, 1, 1, "=");
+ basic.DefSubr (not, "not", false, 1, 1, "!");
+ basic.DefSubr (add, "add", true, 1, -1, "+");
+ basic.DefSubr (mul, "mul", true, 1, -1, "*");
+ basic.DefSubr (sub, "sub", true, 1, -1, "-");
+ basic.DefSubr (div, "div", true, 1, -1, "/");
+ basic.DefSubr (mod, "mod", true, 1, 2, "%");
+ basic.DefSubr (logior, "logior", true, 1, -1, "|");
+ basic.DefSubr (logand, "logand", true, 1, -1, "&");
+ basic.DefSubr (lsh, "lsh", true, 1, 2, "<<");
+ basic.DefSubr (rsh, "rsh", true, 1, 2, ">>");
+ basic.DefSubr (eq, "eq", false, 2, -1, "==");
+ basic.DefSubr (noteq, "noteq", false, 2, 2, "!=");
+ basic.DefSubr (less_than, "lt", false, 2, -1, "<");
+ basic.DefSubr (less_eq, "le", false, 2, -1, "<=");
+ basic.DefSubr (greater_than, "gt", false, 2, -1, ">");
+ basic.DefSubr (greater_eq, "ge", false, 2, -1, ">=");
+ basic.DefSubr (append, "append", true, 0, -1);
+ basic.DefSubr (concat, "concat", true, 0, -1);
+ basic.DefSubr (nth, "nth", false, 2, 2);
+ basic.DefSubr (copy, "copy", false, 1, 1);
+ basic.DefSubr (ins, "ins", true, 2, 2);
+ basic.DefSubr (del, "del", true, 2, 2);
+ basic.DefSubr (eval_clause, "eval", false, 1, 1);
+ basic.DefSubr (break_clause, "break", false, 0, 1);
+ basic.DefSubr (return_clause, "return", false, 1, 1);
+ basic.DefSpecial (and, "and", 1, -1, "&&");
+ basic.DefSpecial (or, "or", 1, -1, "||");
+ basic.DefSpecial (progn_clause, "progn", 0, -1, "expr");
+ basic.DefSpecial (if_clause, "if", 2, 3);
+ basic.DefSpecial (when_clause, "when", 1, -1);
+ basic.DefSpecial (loop_clause, "loop", 1, -1);
+ basic.DefSpecial (while_clause, "while", 1, -1);
+ basic.DefSpecial (cond_clause, "cond", 1, -1);
+ basic.DefSpecial (foreach_clause, "foreach", 2, -1);
+ basic.DefSpecial (quote_clause, "quote", 1, 1);
+ basic.DefSpecial (type_clause, "type", 1, 1);
+
+ Fprogn = basic.GetFunc (Nprogn);
+ }
- private static object ifclause (MExpression[] args, Domain domain)
- {
- object result = false;
+ private static Term set_value (Domain domain, Variable vari, Term[] args)
+ {
+ vari.Value = args[0];
+ return vari.val;
+ }
- if (check_condition (args[0], domain))
- result = args[1].Eval (domain);
- else
- for (int i = 2; i < args.Length; i++)
- result = args[i].Eval (domain);
- return result;
- }
+ private static Term not (Domain domain, Variable vari, Term[] args)
+ {
+ return args[0].IsTrue ? Zero : One;
+ }
- private static object whenclause (MExpression[] args, Domain domain)
- {
- object result = false;
+ private static Term add (Domain domain, Variable vari, Term[] args)
+ {
+ int n = vari == null ? 0 : vari.val.Intval;
- if (check_condition (args[0], domain))
- for (int i = 1; i < args.Length; i++)
- result = args[i].Eval (domain);
- return result;
- }
+ foreach (Term arg in args)
+ n += (int) arg;
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
+ return vari.val;
+ }
- private static object whileclause (MExpression[] args, Domain domain)
- {
- while (check_condition (args[0], domain))
+ private static Term mul (Domain domain, Variable vari, Term[] args)
+ {
+ int n = vari == null ? 1 : vari.val.Intval;
+ foreach (Term arg in args)
+ n *= (int) arg;
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
+ return vari.val;
+ }
+
+ private static Term sub (Domain domain, Variable vari, Term[] args)
+ {
+ int n, i;
+
+ if (vari == null)
+ {
+ n = args[0].Intval;
+ i = 1;
+ }
+ else
+ {
+ n = vari.val.Intval;
+ i = 0;
+ }
+ while (i < args.Length)
+ n -= (int) args[i++];
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
+ return vari.val;
+ }
+
+ private static Term div (Domain domain, Variable vari, Term[] args)
+ {
+ int n, i;
+
+ if (vari == null)
+ {
+ n = args[0].Intval;
+ i = 1;
+ }
+ else
+ {
+ n = vari.val.Intval;
+ i = 0;
+ }
+ while (i < args.Length)
+ n /= args[i++].Intval;
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
+ return vari.val;
+ }
+
+ private static Term mod (Domain domain, Variable vari, Term[] args)
+ {
+ if (vari == null)
+ return (args[0].Intval % args[1].Intval);
+ vari.val.intval = vari.val.Intval % args[0].Intval;
+ return vari.val;
+ }
+
+ private static Term logior (Domain domain, Variable vari, Term[] args)
+ {
+ int n = vari == null ? 0 : vari.val.Intval;
+ foreach (Term arg in args)
+ n |= (int) arg;
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
+ return vari.val;
+ }
+
+ private static Term logand (Domain domain, Variable vari, Term[] args)
+ {
+ int n, i;
+
+ if (vari == null)
+ {
+ n = args[0].Intval;
+ i = 1;
+ }
+ else
+ {
+ n = vari.val.Intval;
+ i = 0;
+ }
+ while (i < args.Length)
+ n &= (int) args[i++];
+ if (vari == null)
+ return n;
+ vari.val.intval = n;
+ return vari.val;
+ }
+
+ private static Term lsh (Domain domain, Variable vari, Term[] args)
+ {
+ if (vari == null)
+ return args[0].Intval << args[1].Intval;
+ vari.val.intval = vari.val.Intval << args[0].Intval;
+ return vari.val;
+ }
+
+ private static Term rsh (Domain domain, Variable vari, Term[] args)
+ {
+ if (vari == null)
+ return args[0].Intval >> args[1].Intval;
+ vari.val.intval = vari.val.Intval >> args[0].Intval;
+ return vari.val;
+ }
+
+ private static Term eq (Domain domain, Variable vari, Term[] args)
+ {
+ Term o = args[0];
+
+ if (o.objval == null)
+ {
for (int i = 1; i < args.Length; i++)
- args[i].Eval (domain);
- return false;
- }
+ if (args[i].objval != null || args[i].intval != o.intval)
+ return Zero;
+ }
+ else
+ {
+ for (int i = 1; i < args.Length; i++)
+ if (o.objval.Equals (args[i].objval))
+ return Zero;
+ }
+ return One;
+ }
- // (cond (COND1 ...) (COND2 ...) ...)
- // => (cond (when COND1 ...) (when COND2 ...) ...)
- private static void translate_cond (MPlist plist, Domain domain)
+ private static Term noteq (Domain domain, Variable vari, Term[] args)
{
- if (plist.IsPlist)
+ return eq (domain, vari, args);
+ }
+
+ private static Term less_than (Domain domain, Variable vari, Term[] args)
+ {
+ int n = (int) args[0];
+
+ for (int i = 1; i < args.Length; i++)
{
- plist = plist.Plist;
- if (plist.IsSymbol && plist.Symbol == Mcond)
- {
- plist.val = Mprogn;
- for (plist = plist.next; ! plist.IsEmpty; plist = plist.next)
- {
- if (! plist.IsPlist)
- throw new Exception ("Invalid cond form: " + plist);
- plist.Plist.Push (MSymbol.symbol, Mwhen);
- }
- }
+ int n1 = (int) args[i];
+ if (n >= n1)
+ return Zero;
+ n = n1;
+ }
+ return One;
+ }
+
+ private static Term less_eq (Domain domain, Variable vari, Term[] args)
+ {
+ int n = (int) args[0];
+ for (int i = 1; i < args.Length; i++)
+ {
+ int n1 = (int) args[i];
+ if (n > n1)
+ return Zero;
+ n = n1;
}
+ return One;
}
- private Function function;
- private MExpression[] args;
- private object val;
+ private static Term greater_than (Domain domain, Variable vari, Term[] args)
+ {
+ int n = (int) args[0];
+ for (int i = 1; i < args.Length; i++)
+ {
+ int n1 = (int) args[i];
+ if (n <= n1)
+ return Zero;
+ n = n1;
+ }
+ return One;
+ }
- public MExpression[] Args { get { return args; } }
- public object Val { get { return val; } }
+ private static Term greater_eq (Domain domain, Variable vari, Term[] args)
+ {
+ int n = (int) args[0];
+ for (int i = 1; i < args.Length; i++)
+ {
+ int n1 = (int) args[i];
+ if (n < n1)
+ return Zero;
+ n = n1;
+ }
+ return One;
+ }
- private MExpression (object val)
+ private static Term append (Domain domain, Variable vari, Term[] args)
{
- this.val = val;
+ List<Term> list;
+
+ if (vari == null)
+ list = new List<Term> ();
+ else
+ list = vari.val.Listval;
+
+ foreach (Term arg in args)
+ {
+ if (arg.IsList)
+ list.AddRange ((List<Term>) arg.objval);
+ else
+ list.Add (arg);
+ }
+ if (vari == null)
+ {
+ Term result;
+ result.intval = 0;
+ result.objval = list;
+ return result;
+ }
+ vari.val.objval = list;
+ return vari.val;
}
- // EXPR = SYMBOL | MTEXT | INTEGER | FUNCALL | PROGN
- // FUNCALL = '(' SYMBOL EXPR* ')'
- // PROGN = '(' EXPR * ')'
- private MExpression (MSymbol key, object val, Domain domain)
+ private static Term concat (Domain domain, Variable vari, Term[] args)
{
- if (key == MSymbol.symbol)
+ string str;
+
+ if (vari == null)
+ str = "";
+ else
+ str = vari.val.Strval;
+
+ foreach (Term arg in args)
{
- function = Function.varref;
- args = new MExpression[1];
- args[0] = new MExpression (val);
+ if (arg.IsStr)
+ str += (string) arg.objval;
+ else if (arg.IsList)
+ foreach (Term term in (List<Term>) arg.objval)
+ str += (char) term.Intval;
+ else
+ str += (char) arg.Intval;
}
- else if (key == MSymbol.integer
- || key == MSymbol.mtext)
+ if (vari == null)
{
- this.val = val;
+ Term result;
+ result.intval = 0;
+ result.objval = str;
+ return result;
}
- else if (key == MSymbol.plist)
+ vari.val.objval = str;
+ return vari.val;
+ }
+
+ private static Term nth (Domain domain, Variable vari, Term[] args)
+ {
+ Term result;
+
+ if (args[1].IsStr)
{
- MPlist p = (MPlist) val;
+ result.intval = ((string) args[1].objval)[args[0].Intval];
+ result.objval = null;
+ }
+ else if (args[1].IsList)
+ {
+ result = ((List<Term>) args[1].objval)[args[0].Intval];
+ }
+ else
+ throw new Exception ("Term is not enumelable: " + args[1]);
+ return result;
+ }
+
+ private static Term copy (Domain domain, Variable vari, Term[] args)
+ {
+ Term result;
+
+ result.intval = 0;
+ result.objval = new List<Term> (args[0].Listval);
+ return result;
+ }
+
+ private static Term ins (Domain domain, Variable vari, Term[] args)
+ {
+ if (vari.val.IsStr)
+ vari.val.objval
+ = vari.val.Strval.Insert (args[0].Intval, args[1].Strval);
+ else if (vari.val.IsList)
+ vari.val.Listval.InsertRange (args[0].Intval, args[1].Listval);
+ else
+ throw new Exception ("term is not collection: " + vari.val);
+ return vari.val;
+ }
+
+ private static Term del (Domain domain, Variable vari, Term[] args)
+ {
+ if (vari.val.IsStr)
+ vari.val.objval
+ = vari.val.Strval.Remove (args[0].Intval,
+ args[1].Intval - args[0].Intval);
+
+ else if (vari.val.IsList)
+ vari.val.Listval.RemoveRange (args[0].Intval,
+ args[1].Intval - args[0].Intval);
+ else
+ throw new Exception ("term is not collection: " + vari.val);
+ return vari.val;
+ }
+
+ private static Term and (Domain domain, Variable vari, Term[] args)
+ {
+ foreach (Term arg in args)
+ if (! arg.Eval (domain).IsTrue)
+ return Zero;
+ return One;
+ }
+
+ private static Term or (Domain domain, Variable vari, Term[] args)
+ {
+ foreach (Term arg in args)
+ if (arg.Eval (domain).IsTrue)
+ return One;
+ return Zero;
+ }
+
+ private static Term eval_clause (Domain domain, Variable vari, Term[] args)
+ {
+ return (args[0].Eval (domain));
+ }
+
+ private static Term progn_clause (Domain domain, Variable vari, Term[] args)
+ {
+ Term result = One;
+
+ foreach (Term arg in args)
+ result = arg.Eval (domain);
+ return result;
+ }
+
+ private static Term if_clause (Domain domain, Variable vari, Term[] args)
+ {
+ if (args[0].Eval (domain).IsTrue)
+ return args[1].Eval (domain);
+ if (args.Length == 2)
+ return Zero;
+ return args[2].Eval (domain);
+ }
+
+ private static Term when_clause (Domain domain, Variable vari, Term[] args)
+ {
+ if (! args[0].Eval (domain).IsTrue)
+ return Zero;
+ Term result = One;
+ for (int i = 1; i < args.Length; i++)
+ result = args[i].Eval (domain);
+ return result;
+ }
+
+ private static Term break_clause (Domain domain, Variable vari, Term[] args)
+ {
+ Stack<CatchTag> clist = domain.catch_list;
+ if (clist.Count == 0)
+ throw new Exception ("No outer loop to break");
+ CatchTag tag = clist.Peek ();
+ if (tag.name != Nloop)
+ throw new Exception ("No outer loop to break");
+ domain.depth = tag.depth;
+ return args.Length == 0 ? Zero : args[0];
+ }
+
+ private static Term return_clause (Domain domain, Variable vari, Term[] args)
+ {
+ Stack<CatchTag> clist = domain.catch_list;
- if (p.IsSymbol)
+ while (clist.Count > 0)
+ {
+ CatchTag tag = clist.Pop ();
+ if (tag.name == Nfunction)
{
- MSymbol sym = p.Symbol;
+ domain.depth = tag.depth;
+ return = args.Length == 0 ? Zero : args[0];
+ }
+ }
+ return args.Length == 0 ? Zero : args[0];
+ }
- if (sym == Mdefun)
- {
- p = p.next;
- if (! p.IsSymbol)
- throw new Exception ("Invalid function argument: "
- + p.val);
- sym = p.Symbol;
- p = p.next;
- if (! p.IsPlist)
- throw new Exception ("Invalid function argument: "
- + p.val);
- domain.Defun (sym, p.Plist, p.next);
- // This Mexpression is just a dummy.
- }
- else
- {
- function = domain.GetFunc (sym);
- p = p.next;
- int nargs = p.Count;
- if (nargs < function.min_arg
- || (function.max_arg >= 0 && nargs > function.max_arg))
- throw new Exception ("Invalid number of arguments to: "
- + sym + " " + nargs);
- args = new MExpression[nargs];
- for (int i = 0; i < nargs; i++, p = p.next)
- {
- domain.Translate (p);
- args[i] = new MExpression (p.key, p.val, domain);
- }
- }
+ private static Term loop_clause (Domain domain, Variable vari, Term[] args)
+ {
+ domain.Catch (Nloop);
+ Term result = Zero;
+ try {
+ while (! domain.Catched)
+ foreach (Term arg in args)
+ {
+ result = arg.Eval (domain);
+ if (domain.Catched)
+ break;
}
- else
+ } finally {
+ domain.Uncatch ();
+ }
+ return result;
+ }
+
+ private static Term while_clause (Domain domain, Variable vari, Term[] args)
+ {
+ while (args[0].Eval (domain).IsTrue)
+ for (int i = 1; i < args.Length; i++)
+ args[i].Eval (domain);
+ return Zero;
+ }
+
+ private static Term cond_clause (Domain domain, Variable vari, Term[] args)
+ {
+ foreach (Term arg in args)
+ {
+ List<Term> list = arg.Listval;
+ Term result = list[0].Eval (domain);
+
+ if (result.IsTrue)
{
- args = new MExpression[1];
- args[0] = new MExpression (p, domain);
+ for (int i = 1; i < list.Count; i++)
+ result = list[i].Eval (domain);
+ return result;
}
}
- else
- throw new Exception ("Invalid expression: " + key + ":" + val);
+ return Zero;
}
- public MExpression (MPlist plist, Domain domain)
+ private static Term foreach_clause (Domain domain, Variable vari,
+ Term[] args)
{
- function = Function.block;
- args = new MExpression[plist.Count];
- for (int i = 0; ! plist.IsEmpty; i++, plist = plist.next)
+ List<Term> list = args[0].Listval;
+ Bindings current = domain.bindings;
+
+ foreach (Term term in list)
{
- domain.Translate (plist);
- args[i] = new MExpression (plist.key, plist.val, domain);
+ domain.Bind (vari, term);
+ try {
+ for (int i = 1; i < args.Length; i++)
+ args[i].Eval (domain);
+ } finally {
+ domain.UnboundTo (current);
+ }
}
+ return Zero;
}
- public MExpression (XmlNode node, Domain domain)
+ private static Term quote_clause (Domain domain, Variable vari, Term[] args)
{
- MSymbol sym = node.Name;
+ return new Term (args[0]);
+ }
+
+ private static Term type_clause (Domain domain, Variable vari, Term[] args)
+ {
+ if (args[0].IsInt)
+ return TermInt;
+ if (args[0].IsStr)
+ return TermStr;
+ if (args[0].IsName)
+ return TermName;
+ if (args[0].IsList)
+ return TermList;
+ return TermTerm;
+ }
- function = domain.GetFunc (sym);
+ public struct Term
+ {
+ public int intval;
+ public object objval;
- XmlAttributeCollection attrs = node.Attributes;
+ public Term (int i) { intval = i; objval = null; }
+ public Term (Name name) { intval = 0; objval = name; }
+ public Term (string str) { intval = 0; objval = str; }
+ public Term (List<Term> list) { intval = 0; objval = list; }
+ public Term (Term term) { intval = 0; objval = term; }
- int nargs = attrs.Count + node.ChildNodes.Count;
- if (nargs < function.min_arg
- || (function.max_arg >= 0 && nargs > function.max_arg))
- throw new Exception ("Invalid number of arguments: " + node.InnerXml);
- args = new MExpression[nargs];
- int i;
- for (i = 0; i < attrs.Count; i++)
+ public Term (XmlNode node, Domain domain)
{
- string str = sttrs[i].Value;
+ Name name = node.Name;
+ if (name == Ninteger)
+ {
+ intval = parse_integer (node.InnerText);
+ objval = null;
+ }
+ else
+ {
+ intval = 0;
+ if (name == Nsymbol)
+ objval = (Name) node.InnerText;
+ else if (name == Nstring)
+ objval = node.InnerText.Clone ();
+ else if (name == Nvarref)
+ objval = domain.GetVar ((Name) node.Attributes[0].Value);
+ else if (name == Nlist)
+ {
+ List<Term> list = new List<Term> ();
+ for (node = node.FirstChild; node != null;
+ node = node.NextSibling)
+ list.Add (new Term (node, domain));
+ objval = list;
+ }
+ else
+ {
+ Function func;
+ Variable vari = null;
+ Term[] args;
+
+ if (name == Nfuncall)
+ name = node.Attributes[0].Value;
+ else if (node.Attributes[Nvname] != null)
+ vari = domain.GetVar (node.Attributes[Nvname].Value);
+ func = domain.GetFunc (name);
+ XmlNodeList nlist = node.ChildNodes;
+ int nargs = nlist.Count;
+
+ if (nargs < func.min_arg
+ || (func.max_arg >= 0 && nargs > func.max_arg))
+ throw new Exception ("Invalid number of arguments to: "
+ + name + " " + nargs);
+ args = new Term[nargs];
+ for (int i = 0; i < nlist.Count; i++)
+ args[i] = new Term (nlist[i], domain);
+ objval = new Funcall (func, vari, args);
+ }
+ }
}
- }
- public object Eval (Domain domain)
- {
- if (function == null)
+ private class Funcall
+ {
+ internal Function func;
+ internal Variable vari;
+ internal Term[] args;
+
+ public Funcall (Function func, Variable vari, Term[] args)
{
- if (val is MSymbol)
- val = domain.GetValue ((MSymbol) val);
+ this.func = func;
+ this.vari = vari;
+ this.args = args;
}
- else
- val = function.Call (args, domain);
- return val;
+
+ public Term Eval (Domain domain)
+ {
+ domain.DebugWrite (true, "(({0}", func.name);
+ for (int i = 0; i < args.Length; i++)
+ domain.DebugWrite (false, " {0}", args[i].ToString ());
+ domain.DebugWrite (false, ")");
+ domain.depth++;
+ Term result = func.Call (domain, vari, args);
+ domain.depth--;
+ domain.DebugWrite (true, " ==> {0})", result.ToString ());
+ return result;
+ }
+
+ public override string ToString ()
+ {
+ string str = "<funcall fname=\"" + func.name;
+ if (args == null)
+ return str + "\"/>";
+ str += "\">";
+ foreach (Term e in args)
+ str += e;
+ return (str + "</funcall>");
+ }
+ }
+
+ public int Intval {
+ get {
+ if (objval != null)
+ throw new Exception ("term is not integer: " + this);
+ return intval;
+ }
+ }
+
+ public string Strval {
+ get {
+ if (! IsStr)
+ throw new Exception ("term is not string: " + this);
+ return (string) objval;
+ }
+ }
+
+ public List<Term> Listval {
+ get {
+ if (! IsList)
+ throw new Exception ("term is not list: " + this);
+ return (List<Term>) objval;
+ }
+ }
+
+ public bool IsTrue {
+ get {
+ return (objval == null
+ ? (intval != 0)
+ : objval is List<Term>
+ ? (((List<Term>) objval).Count != 0)
+ : true);
+ }
+ }
+ public bool IsInt { get { return (objval == null); } }
+ public bool IsStr { get { return (objval is string); } }
+ public bool IsName { get { return (objval is Name); } }
+ public bool IsList { get { return (objval is List<Term>); } }
+
+ public Term Eval (Domain domain)
+ {
+ if (objval == null || objval is Name || objval is string)
+ return this;
+ if (objval is List<Term>)
+ return new Term ((List<Term>) objval);
+ if (objval is Funcall)
+ return ((Funcall) objval).Eval (domain);
+ if (objval is Variable)
+ return ((Variable) objval).val;
+ if (objval is Term)
+ return (Term) objval;
+ throw new Exception ("invalid Term object: " + objval);
+ }
+
+ public static explicit operator int (Term term)
+ {
+ if (term.objval != null)
+ throw new Exception ("Not an integer term: " + term);
+ return term.intval;
+ }
+
+ public static explicit operator Name (Term term)
+ {
+ return (Name) term.objval;
+ }
+
+ public static implicit operator Term (int i)
+ {
+ return new Term (i);
+ }
+
+ public override string ToString ()
+ {
+ string str;
+
+ if (objval == null)
+ str = "<integer>" + intval + "</integer>";
+ else if (objval is Name)
+ str = "<symbol>" + objval + "</symbol>";
+ else if (objval is string)
+ str = "<string>" + objval + "</string>";
+ else if (objval is List<Term>)
+ {
+ str = "<list>";
+ foreach (Term e in (List<Term>) objval)
+ str += e;
+ str += "</list>";
+ }
+ else if (objval is Funcall)
+ str = "<funcall fname=\"" + ((Funcall) objval).func.name + "\"/>";
+ else if (objval is Variable)
+ str = "<variable vname=\"" + ((Variable) objval).name + "\"/>";
+ else if (objval is Term)
+ str = "<quote>" + objval + "</quote>";
+ else
+ throw new Exception ("invalid Term object: " + objval);
+ return str;
+ }
}
- public override string ToString ()
+ static Term Zero = new Term (0);
+ static Term One = new Term (1);
+ static Term TermInt = new Term (Ninteger);
+ static Term TermStr = new Term (Nstring);
+ static Term TermName = new Term (Nsymbol);
+ static Term TermList = new Term (Nlist);
+ static Term TermTerm = new Term ((Name) "term");
+
+ internal static int parse_integer (string str)
{
- string str;
+ int len = str.Length;
+ bool negative = false;
+
+ if (len <= 1)
+ return (len == 0 ? 0 : str[0] - '0');
+
+ int c = str[0];
+ int i;
- if (function != null)
+ if (c == '0' && str[1] == 'x')
{
- str = "(" + function.Name.Name;
- if (args != null)
- foreach (MExpression e in args)
- str += " " + e.ToString ();
- str += ")";
+ i = 0;
+ for (int idx = 2; idx < len; idx++)
+ {
+ c = str[idx];
+ if (c < '0')
+ break;
+ else if (c <= '9')
+ i = i * 16 + (c - '0');
+ else if (c < 'A')
+ break;
+ else if (c <= 'F')
+ i = i * 16 + (c - 'A');
+ else if (c < 'a')
+ break;
+ else if (c <= 'f')
+ i = i * 16 + (c - 'a');
+ else
+ break;
+ }
+ return i;
}
- else if (val != null)
+ if (c == '-')
+ negative = true;
+ i = c - '0';
+ for (int idx = 1; idx < len; idx++)
{
- if (val is MText)
- str = "\"" + (string) ((MText) val) + "\"";
- else
- str = val.ToString ();
+ c = str[idx];
+ if (c < '0' || c > '9')
+ break;
+ i = i * 10 + (c - '0');
}
- else
- str = "()";
+ return negative ? - i : i;
+ }
+
+ private Term[] terms;
+
+ public Xexpression (string url, Domain domain)
+ {
+ XmlDocument doc = new XmlDocument (Name.Table);
+ XmlNode node;
+
+ using (XmlTextReader reader = new XmlTextReader (url, Name.Table))
+ {
+ do {
+ reader.Read ();
+ } while (reader.NodeType != XmlNodeType.None
+ && (reader.NodeType != XmlNodeType.Element
+ || reader.Name != Nexpr));
+ if (reader.NodeType == XmlNodeType.None)
+ throw new Exception ("Node <expr> not found");
+ node = doc.ReadNode (reader);
+ }
+
+ int nterms = 0;
+ for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling)
+ if (n.NodeType == XmlNodeType.Element)
+ {
+ if (n.Name == Ndefun)
+ domain.RegisterFunction (n);
+ else if (n.Name == Ndefvar)
+ domain.Defvar (n);
+ else
+ nterms++;
+ }
+
+ terms = new Term[nterms];
+ int i = 0;
+ for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling)
+ if (n.NodeType == XmlNodeType.Element)
+ {
+ if (n.Name == Ndefun)
+ domain.Defun (n);
+ else if (n.Name != Ndefvar)
+ terms[i++]= new Term (n, domain);
+ }
+ }
+
+ public Term Eval (Domain domain)
+ {
+ Term result = Zero;
+
+ domain.depth = 0;
+ foreach (Term term in terms)
+ result = term.Eval (domain);
+ return result;
+ }
+
+ public override string ToString ()
+ {
+ string str = "";
+ for (int i = 0; i < terms.Length; i++)
+ str += terms[i];
return str;
}
}
projects / m17n / m17n-lib-cs.git / blobdiff