namespace System.Xml.Expression
{
- public class XmlName : IEquatable<XmlName>
+ public abstract class Xex
{
- private static NameTable nt = new NameTable ();
-
- 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; }
+ }
+
+ private static Name Nexpr = "expr";
+
+ private static Name Nfuncall = "funcall";
+ private static Name Nvariable = "variable";
+ private static Name Ninteger = "integer";
+ private static Name Nstring = "string";
+ private static Name Nboolean = "boolean";
+ private static Name Nsymbol = "symbol";
+ private static Name Nlist = "list";
+ private static Name Nobject = "object";
- public void UnboundTo (MPlist boundary)
+ private static Name Ndefun = "defun";
+ private static Name Nfname = "fname";
+ private static Name Nargs = "args";
+ private static Name Noptional = "optional";
+ private static Name Nrest = "rest";
+ private static Name Nbody = "body";
+
+ private static Name Ndefvar = "defvar";
+ private static Name Ndescription = "description";
+ private static Name Nrange = "range";
+
+ private static Name Nprogn = "progn";
+
+ internal abstract class Function
+ {
+ public readonly Name name;
+ public int min_arg, max_arg;
+
+ public Function (Name name, int min_arg, int max_arg)
{
- while (boundary != boundaries.Pop ());
- while (bindings != boundary)
- bindings = bindings.next;
+ this.name = name;
+ this.min_arg = min_arg;
+ this.max_arg = max_arg;
}
- public void Defun (string name, Builtin builtin, int min_arg, int max_arg)
+ public abstract object Call (Xex[] args, Domain domain);
+
+ public override string ToString ()
{
- Defun (name, builtin, min_arg, max_arg, false);
+ return name;
}
- public void Defun (string name, Builtin builtin, int min_arg, int max_arg,
- bool specialp)
+ internal class Subroutine : Function
{
- MSymbol sym = name;
- Function func = (Function) functions.Get (sym);
+ public Builtin builtin;
- if (func != null)
+ public Subroutine (Builtin builtin, Name name,
+ int min_arg, int max_arg)
+ : base (name, min_arg, max_arg)
{
- 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.builtin = builtin;
}
+
+ public override object Call (Xex[] args, Domain domain)
+ {
+ object result;
+
+ foreach (Xex a in args)
+ if (a.Eval (domain) == null)
+ throw new Exception (a + ":evaled to null");
+ Console.Write ("calling (" + this);
+ foreach (Xex a in args)
+ Console.Write (" " + a);
+ Console.Write (") => ");
+ result = builtin (args, domain);
+ Console.WriteLine (result);
+ return result;
+ }
}
- public void Defun (MSymbol sym, MPlist args, MPlist body)
+ internal class SpecialForm : Function
{
- Function func = (Function) functions.Get (sym);
+ public Builtin builtin;
- if (func != null)
+ public SpecialForm (Builtin builtin, Name name,
+ int min_arg, int max_arg)
+ : base (name, min_arg, max_arg)
{
- 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;
+ this.builtin = builtin;
}
- else
- {
- func = new Function (sym, args, body, this);
- functions = functions.Cons (sym, func);
- }
+
+ public override object Call (Xex[] args, Domain domain)
+ {
+ object result;
+
+ Console.Write ("calling (" + this);
+ foreach (Xex a in args)
+ Console.Write (" " + a);
+ Console.Write (") => ");
+ result = builtin (args, domain);
+ Console.WriteLine (result);
+ return result;
+ }
}
- public void Defun (XmlNode node)
+ internal class Lambda : Function
{
- MSymbol sym = node.Attributes["id"].Value;
- Function func = (Function) functions.Get (sym);
+ internal Xex[] args;
+ internal Xex[] body;
- if (func != null)
+ public Lambda (Name name, int min_arg, int max_arg)
+ : base (name, min_arg, max_arg)
{
- 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);
- }
- }
- internal Function GetFunc (MSymbol name)
- {
- Function func = (Function) functions.Get (name);
+ public void SetArgs (XmlNode node, int nargs, Domain domain)
+ {
+ args = new Xex[nargs];
+ node = node.FirstChild;
+ for (int i = 0; i < nargs; node = node.NextSibling)
+ if (node.Name != Noptional && node.Name != Nrest)
+ args[i++] = New (node, domain);
+ }
- if (func == null)
- {
- if (parent != null)
- return parent.GetFunc (name);
- throw new Exception ("Unknown function: " + name);
+ public void SetBody (XmlNode node, Domain domain)
+ {
+ XmlNodeList nlist = node.ChildNodes;
+
+ body = new Xex[nlist.Count];
+ for (int i = 0; i < nlist.Count; i++)
+ body[i] = New (nlist[i], domain);
+ }
+
+ public void Setup (XmlNode node, Domain domain)
+ {
+ node = node.FirstChild;
+ if (node.Name == Nargs)
+ {
+ SetArgs (node, max_arg, domain);
+ node = node.NextSibling;
+ }
+ if (node.Name == Nbody)
+ SetBody (node, domain);
+ }
+
+ public override object Call (Xex[] args, Domain domain)
+ {
+ Bindings current = domain.bindings;
+ object result = false;
+
+ try {
+ int i;
+ for (i = 0; i < min_arg; i++)
+ {
+ Xex a = this.args[i];
+ bool isdirect = a is Xex.Const;
+ Name name = (isdirect
+ ? (Name) a.val : ((Xex.Varref) a).vari.name);
+ Variable var = domain.GetVar (name);
+
+ if (isdirect)
+ domain.Bind (var, args[i].val);
+ else
+ domain.Bind (var, args[i].Eval (domain));
+ }
+ Console.Write ("calling (" + this);
+ foreach (Xex e in body)
+ result = e.Eval (domain);
+ Console.WriteLine (result);
+ } finally {
+ domain.UnboundTo (current);
}
- return func;
- }
+ return result;
+ }
- 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 string ToString ()
+ {
+ string str = "(" + name;
+ foreach (Xex a in args)
+ str += " " + a;
+ return (str + ")");
+ }
}
+ }
- public void CopyFunc (Domain domain)
+ internal abstract class Variable
+ {
+ public readonly Name name;
+ public readonly Name type;
+ internal object val;
+
+ public Variable (Name name, Name type, object value)
{
- foreach (MPlist p in functions)
- domain.functions = domain.functions.Cons (p.key, p.val);
+ if (value != null)
+ Value = value;
+ this.name = name;
+ this.type = type;
}
- public object GetValue (MSymbol name)
+ public object Value
{
- MPlist slot = bindings.Find (name);
-
- if (slot == null)
+ get { return val; }
+ set
{
- if (parent != null)
- return parent.GetValue (name);
- throw new Exception ("Unbound variable: " + name);
+ if (! ValueP (value))
+ throw new Exception ("Invalid value type: " + value);
+ val = value;
}
- return slot.val;
}
- public object SetValue (MSymbol name, object val)
- {
- MPlist boundary = boundaries.Peek ();
+ public abstract bool ValueP (object value);
- for (MPlist plist = bindings; plist != boundary; plist = plist.next)
- if (plist.key == name)
- {
- plist.val = val;
- return val;
- }
- bindings = bindings.Cons (name, val);
- return val;
- }
+ public override string ToString () { return name + "=" + val; }
+ }
- public bool IsBound (MSymbol name)
+ internal class VarInt : Variable
+ {
+ public struct Range
{
- return (bindings.Find (name) != null);
+ public int from, to;
}
- public void Translate (MPlist plist)
- {
- if (parent != null)
- parent.Translate (plist);
- if (translator != null)
- for (MPlist p = plist; ! p.IsEmpty; p = p.next)
- translator (p, this);
- }
+ public Range[] ranges;
- public override string ToString ()
+ public VarInt (Name name, object value) : base (name, Ninteger, value) { }
+
+ public override bool ValueP (object value)
{
- string str = "<(functions";
- foreach (MPlist p in functions)
- str += " " + p.key;
- str += ") (bindings " + bindings + ")";
- if (context != null)
- str += " (" + context + ")";
- str += ">";
- return str;
+ int i;
+
+ if (! (value is int))
+ return false;
+ if (ranges == null)
+ return true;
+ i = (int) value;
+ foreach (Range r in ranges)
+ if (i >= r.from && i <= r.to)
+ return true;
+ return false;
}
}
- public delegate object Builtin (MExpression[] args, Domain domain);
- public delegate void Translator (MPlist plist, Domain domain);
-
- internal class Function
+ internal class VarStr : Variable
{
- internal class Lambda
- {
- internal MSymbol[] args;
- internal MExpression[] body;
-
- public Lambda (MPlist args, MPlist body, Domain domain)
- {
- SetArgs (args);
- SetBody (body, domain);
- }
-
- public Lambda (XmlNode node, Domain domain)
- {
- Set (node, domain);
- }
-
- public void SetArgs (MPlist args)
- {
- int len = args == null ? 0 : args.Count;
+ public string[] ranges;
- 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)
- {
- 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);
- }
- }
+ public VarStr (Name name, object value) : base (name, Nstring, value) { }
- public void Set (XmlNode node, Domain domain)
- {
- XmlNodeList body = node.ChildNodes;
- int idx = 0;
+ public override bool ValueP (object value)
+ {
+ string str;
- 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 (! (value is string))
+ return false;
+ if (ranges == null)
+ return true;
+ str = (string) value;
+ foreach (string s in ranges)
+ if (s == str)
+ 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 static Function ignore, varref, block;
+ internal class VarBool : Variable
+ {
+ public VarBool (Name name, object value)
+ : base (name, Nboolean, value) { }
- public Function (MSymbol name, Builtin builtin,
- int min_arg, int max_arg, bool specialp)
+ public override bool ValueP (object value)
{
- Name = name;
- this.builtin = builtin;
- this.min_arg = min_arg;
- this.max_arg = max_arg;
- this.specialp = specialp;
+ if (! (value is bool))
+ return false;
+ return true;
}
+ }
- internal Function (MSymbol name, MPlist args, MPlist body,
- Domain domain)
- {
- Name = name;
- lambda = new Lambda (args, body, domain);
- this.min_arg = this.max_arg = lambda.args.Length;
- }
+ internal class VarMisc : Variable
+ {
+ public VarMisc (Name name, object value) : base (name, Nobject, value) { }
- internal Function (MSymbol name, XmlNode node, Domain domain)
+ public override bool ValueP (object value)
{
- Name = name;
- lambda = new Lambda (node, domain);
- this.min_arg = this.max_arg = lambda.args.Length;
+ return true;
}
+ }
- private Function ()
+ internal class Bindings
+ {
+ private Variable vari;
+ private object old_value;
+ private Bindings next;
+
+ private Bindings (Variable vari, object value)
{
- Name = MSymbol.nil;
+ this.vari = vari;
+ old_value = value;
}
-
- static Function ()
+
+ public static Bindings Bind (Bindings bindings,
+ Variable vari, object value)
{
- 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, vari.val);
+
+ b.vari.Value = value;
+ 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)
+ 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;
- }
- }
-
- private static Domain basic;
-
- static MExpression ()
- {
- 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);
-
- 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));
- }
-
- private static object not (MExpression[] args, Domain domain)
- {
- 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;
+ string str = "(bindings";
+ for (Bindings b = this; b != null; b = b.next)
+ str += " " + vari;
+ return str + ")";
+ }
}
- private static object plus (MExpression[] args, Domain domain)
+#if false
+ internal class ThrowException : Exception
{
- if (args[0].val is int)
- {
- int n = 0;
- foreach (MExpression e in args)
- n += (int) e.val;
- return n;
- }
- else if (args[0].val is MText)
+ Name tag;
+ public object value;
+
+ public ThrowException (Name tag, object value) : base ()
{
- MText mt = new MText ();
- foreach (MExpression e in args)
- mt += (MText) e.val;
- return mt;
+ this.tag = tag;
+ this.value = value;
}
- throw new Exception ("Not an integer nor MText: " + args[0].val);
}
+#endif
- private static object multi (MExpression[] args, Domain domain)
+ public class Domain
+ {
+ public object context;
+
+ internal Dictionary<Name, Function> functions;
+ internal Dictionary<Name, Variable> variables;
+ internal Bindings bindings;
+
+ 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, object 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);
+ Console.WriteLine ("binding " + vari);
}
- 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)
+ public void DefSubr (Builtin builtin, string str,
+ int min_arg, int max_arg)
{
- int n = 0;
- foreach (MExpression e in args)
- n &= (int) e.val;
- return n;
+ Name name = str;
+ functions[name]
+ = new Function.Subroutine (builtin, name, min_arg, max_arg);
}
- private static object pluseq (MExpression[] args, Domain domain)
+ public void DefSpecial (Builtin builtin, string str,
+ int min_arg, int max_arg)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- object val = domain.GetValue (sym);
+ Name name = str;
+ functions[name]
+ = new Function.SpecialForm (builtin, name, min_arg, max_arg);
+ }
- 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)
+ private static Name ParseHead (XmlNode node,
+ out int min_arg, out int max_arg)
+ {
+ Name name = node.Attributes[Nfname].Value;
+ int nargs = 0, noptions = 0, nrest = 0;
+ XmlNode n;
+
+ for (n = node.FirstChild; n != null; n = n.NextSibling)
{
- MText mt = (MText) val;
- for (int i = 1; i < args.Length; i++)
- mt.Cat ((MText) args[i].Eval (domain));
- val = mt;
+ if (n.Name == Noptional || n.Name == Nrest)
+ break;
+ nargs++;
}
- domain.SetValue (sym, val);
- return val;
+ if (n != null && n.Name == Noptional)
+ for (n = n.NextSibling; n != null; n = n.NextSibling)
+ {
+ if (n.Name == Nrest)
+ break;
+ noptions++;
+ }
+ if (n != null && n.Name == Nrest)
+ for (n = n.NextSibling; n != null; n = n.NextSibling)
+ nrest++;
+ min_arg = nargs;
+ max_arg = nargs + noptions + nrest;
+ if (nrest == 1)
+ max_arg = - max_arg;
+ return name;
}
- private static object multieq (MExpression[] args, Domain domain)
+ internal Function.Lambda RegisterFunction (XmlNode node)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ int min_arg, max_arg;
+ Name name = ParseHead (node, out min_arg, out max_arg);
+ Function.Lambda lambda = new Function.Lambda (name, min_arg, max_arg);
- for (int i = 1; i < args.Length; i++)
- n *= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ functions[name] = lambda;
+ return lambda;
}
- private static object minuseq (MExpression[] args, Domain domain)
+ internal Function Defun (XmlNode node)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Name name = node.Attributes[Nfname].Value;
+ Function.Lambda lambda;
- for (int i = 1; i < args.Length; i++)
- n -= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ if (! functions.TryGetValue (name, out lambda))
+ lambda = RegisterFunction (node);
+ lambda.Setup (node, this);
+ return func;
}
- private static object divideeq (MExpression[] args, Domain domain)
+ public void Defvar (Name name, XmlNode node)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Variable vari;
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ if (node.Name == Ndescription)
+ node = node.NextSibling;
+ if (node != null)
+ {
+ Name type = node.Name;
+ string val = node.Value;
+ XmlNodeList range_list = null;
+ int nranges = 0;
+
+ node = node.NextSibling;
+ if (node != null)
+ {
+ range_list = node.ChildNodes;
+ nranges = range_list.Count;
+ }
+
+ if (type == Ninteger)
+ {
+ VarInt vi = new VarInt (name, parse_integer (val));
+ if (range_list != null)
+ {
+ vi.ranges = new VarInt.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.Value);
+ vi.ranges[i].to =
+ parse_integer (n.LastChild.Value);
+ }
+ else
+ {
+ int num = parse_integer (n.Value);
+ vi.ranges[i].from = vi.ranges[i].to = num;
+ }
+ }
+ }
+ vari = vi;
+ }
+ else if (type == Nstring)
+ {
+ VarStr vs = new VarStr (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 if (type == Nboolean)
+ {
+ vari = new VarBool (name, val == "true");
+ }
+ else
+ throw new Exception ("Unknown type: " + type);
+ }
+ else
+ vari = new VarMisc (name, null);
+ variables[name] = vari;
}
- private static object percenteq (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;
- for (int i = 1; i < args.Length; i++)
- n %= (int) args[i].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 logioreq (MExpression[] args, Domain domain)
+ public bool CopyFunc (Domain domain, Name name)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Function func = GetFunc (name);
- for (int i = 1; i < args.Length; i++)
- n |= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ domain.functions[name] = func;
+ return true;
}
- private static object logandeq (MExpression[] args, Domain domain)
+ public void CopyFunc (Domain domain)
{
- 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);
+ foreach (KeyValuePair<Name, Function> kv in functions)
+ domain.functions[kv.Key] = kv.Value;
}
- private static object lshift (MExpression[] args, Domain domain)
+ internal Variable GetVar (Name name)
{
- return (int) args[0].val << (int) args[1].val;
+ Variable vari;
+
+ if (! variables.TryGetValue (name, out vari))
+ variables[name] = vari = new VarMisc (name, null);
+ return vari;
}
- private static object lshifteq (MExpression[] args, Domain domain)
+ internal Variable GetVar (Xex e)
{
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- n <<= (int) args[1].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ if (! (e.val is Name))
+ throw new Exception ("Not a symbol" + e.val);
+ return GetVar ((Name) e.val);
}
- private static object rshift (MExpression[] args, Domain domain)
+ public override string ToString ()
{
- return (int) args[0].val >> (int) args[1].val;
+ 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 rshifteq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ public delegate object Builtin (Xex[] args, Domain domain);
- n >>= (int) args[1].Eval (domain);
- return domain.SetValue (sym, (object) n);
- }
+ private static Domain basic = new Domain ();
- private static object eq (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
+ internal static Function Fprogn;
- for (int i = 1; i < args.Length; i++)
- if (n != (int) args[i].val)
- return false;
- return true;
- }
+ static Xex ()
+ {
+ basic.DefSubr (set_value, "set", 2, 2);
+ basic.DefSubr (set_value, "=", 2, 2);
+ basic.DefSubr (and, "and", 1, -1);
+ basic.DefSubr (and, "&&", 1, -1);
+ basic.DefSubr (or, "or", 1, -1);
+ basic.DefSubr (or, "||", 1, -1);
+ basic.DefSubr (not, "not", 1, 1);
+ basic.DefSubr (not, "!", 1, 1);
+ basic.DefSubr (add, "add", 2, -1);
+ basic.DefSubr (add, "+", 2, -1);
+ basic.DefSubr (mul, "mul", 2, -1);
+ basic.DefSubr (mul, "*", 2, -1);
+ basic.DefSubr (sub, "sub", 1, -1);
+ basic.DefSubr (sub, "-", 1, -1);
+ basic.DefSubr (div, "div", 2, -1);
+ basic.DefSubr (div, "/", 2, -1);
+ basic.DefSubr (mod, "mod", 2, 2);
+ basic.DefSubr (mod, "%", 2, 2);
+ basic.DefSubr (logior, "logior", 2, -1);
+ basic.DefSubr (logior, "|", 2, -1);
+ basic.DefSubr (logand, "logand", 2, -1);
+ basic.DefSubr (logand, "&", 2, -1);
+ basic.DefSubr (add_set, "add-set", 2, -1);
+ basic.DefSubr (add_set, "+=", 2, -1);
+ basic.DefSubr (mul_set, "mul-set", 2, -1);
+ basic.DefSubr (mul_set, "*=", 2, -1);
+ basic.DefSubr (sub_set, "sub-set", 2, -1);
+ basic.DefSubr (sub_set, "-=", 2, -1);
+ basic.DefSubr (div_set, "div-set", 2, -1);
+ basic.DefSubr (div_set, "/=", 2, -1);
+ basic.DefSubr (mod_set, "mod-set", 2, 2);
+ basic.DefSubr (mod_set, "%=", 2, 2);
+ basic.DefSubr (logior_set, "logior-set", 2, -1);
+ basic.DefSubr (logior_set, "|=", 2, -1);
+ basic.DefSubr (logand_set, "logand-set", 2, -1);
+ basic.DefSubr (logand_set, "&=", 2, -1);
+ basic.DefSubr (lsh, "lsh", 2, 2);
+ basic.DefSubr (lsh, "<<", 2, 2);
+ basic.DefSubr (rsh, "rsh", 2, 2);
+ basic.DefSubr (rsh, ">>", 2, 2);
+ basic.DefSubr (lsh_set, "lsh-set", 2, 2);
+ basic.DefSubr (lsh_set, "<<=", 2, 2);
+ basic.DefSubr (rsh_set, "rsh-set", 2, 2);
+ basic.DefSubr (rsh_set, ">>=", 2, 2);
+ basic.DefSubr (eq, "eq", 2, -1);
+ basic.DefSubr (eq, "==", 2, -1);
+ basic.DefSubr (noteq, "noteq", 2, 2);
+ basic.DefSubr (noteq, "!=", 2, 2);
+ basic.DefSubr (less_than, "lt", 2, -1);
+ basic.DefSubr (less_than, "<", 2, -1);
+ basic.DefSubr (less_eq, "le", 2, -1);
+ basic.DefSubr (less_eq, "<=", 2, -1);
+ basic.DefSubr (greater_than, "gt", 2, -1);
+ basic.DefSubr (greater_than, ">", 2, -1);
+ basic.DefSubr (greater_eq, "ge", 2, -1);
+ basic.DefSubr (greater_eq, ">=", 2, -1);
+ basic.DefSubr (eval_clause, "eval", 1, 1);
+ basic.DefSpecial (progn_clause, "progn", 0, -1);
+ basic.DefSpecial (progn_clause, "expr", 0, -1);
+ basic.DefSpecial (if_clause, "if", 2, -1);
+ basic.DefSpecial (when_clause, "when", 1, -1);
+ basic.DefSpecial (while_clause, "while", 1, -1);
+
+ Fprogn = basic.GetFunc (Nprogn);
+ }
- private static object noteq (MExpression[] args, Domain domain)
- {
- return ((int) args[0].val != (int) args[1].val);
- }
+ private static bool is_true (object val)
+ {
+ return (val is bool ? (bool) val
+ : val is int ? (int) val == 0
+ : true);
+ }
- private static object less (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
+ private static object set_value (Xex[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar (args[0]);
- for (int i = 1; i < args.Length; i++)
- {
- int n1 = (int) args[i].val;
- if (n >= n1)
- return false;
- n = n1;
- }
- return true;
- }
+ vari.Value = args[1].val;
+ return vari.val;
+ }
- private static object lesseq (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;
- }
+ private static object and (Xex[] args, Domain domain)
+ {
+ foreach (Xex arg in args)
+ if (! is_true (arg.val))
+ return false;
+ return true;
+ }
- private static object more (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;
- }
+ private static object or (Xex[] args, Domain domain)
+ {
+ foreach (Xex arg in args)
+ if (is_true (arg.val))
+ return true;
+ return false;
+ }
- 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;
- }
+ private static object not (Xex[] args, Domain domain)
+ {
+ return ! is_true (args[0].val);
+ }
- private static object progn (MExpression[] args, Domain domain)
- {
- object result = false;
+ private static object add (Xex[] args, Domain domain)
+ {
+ int n = 0;
+ foreach (Xex e in args)
+ n += (int) e.val;
+ return n;
+ }
- foreach (MExpression e in args)
- result = e.Eval (domain);
- return result;
- }
+ private static object mul (Xex[] args, Domain domain)
+ {
+ int n = 1;
+ foreach (Xex e in args)
+ n *= (int) e.val;
+ return n;
+ }
- 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);
- }
+ private static object sub (Xex[] args, Domain domain)
+ {
+ 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 ifclause (MExpression[] args, Domain domain)
- {
- object result = false;
+ private static object div (Xex[] args, Domain domain)
+ {
+ int n = (int) args[0].val;
+ for (int i = 1; i < args.Length; i++)
+ n /= (int) args[i].val;
+ return n;
+ }
- 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 object mod (Xex[] args, Domain domain)
+ {
+ return ((int) args[0].val % (int) args[1].val);
+ }
- private static object whenclause (MExpression[] args, Domain domain)
- {
- object result = false;
+ private static object logior (Xex[] args, Domain domain)
+ {
+ int n = 0;
+ foreach (Xex e in args)
+ n |= (int) e.val;
+ return n;
+ }
- if (check_condition (args[0], domain))
- for (int i = 1; i < args.Length; i++)
- result = args[i].Eval (domain);
- return result;
- }
+ private static object logand (Xex[] args, Domain domain)
+ {
+ int n = (int) args[0].val;
+ for (int i = 1; i < args.Length; i++)
+ n &= (int) args[i].val;
+ return n;
+ }
- private static object whileclause (MExpression[] args, Domain domain)
- {
- while (check_condition (args[0], domain))
- for (int i = 1; i < args.Length; i++)
- args[i].Eval (domain);
- return false;
- }
+ private static object add_set (Xex[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
+
+ for (int i = 1; i < args.Length; i++)
+ n += (int) args[i].val;
+ vari.val = n;
+ return n;
+ }
- // (cond (COND1 ...) (COND2 ...) ...)
- // => (cond (when COND1 ...) (when COND2 ...) ...)
- private static void translate_cond (MPlist plist, Domain domain)
+ private static object mul_set (Xex[] args, Domain domain)
{
- if (plist.IsPlist)
- {
- 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);
- }
- }
- }
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
+
+ for (int i = 1; i < args.Length; i++)
+ n *= (int) args[i].val;
+ vari.val = n;
+ return n;
}
- private Function function;
- private MExpression[] args;
- private object val;
+ private static object sub_set (Xex[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
- public MExpression[] Args { get { return args; } }
- public object Val { get { return val; } }
+ for (int i = 1; i < args.Length; i++)
+ n -= (int) args[i].val;
+ vari.val = n;
+ return n;
+ }
- private MExpression (object val)
+ private static object div_set (Xex[] args, Domain domain)
{
- this.val = val;
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
+
+ for (int i = 1; i < args.Length; i++)
+ n /= (int) args[i].val;
+ vari.val = n;
+ return n;
}
- // EXPR = SYMBOL | MTEXT | INTEGER | FUNCALL | PROGN
- // FUNCALL = '(' SYMBOL EXPR* ')'
- // PROGN = '(' EXPR * ')'
- private MExpression (MSymbol key, object val, Domain domain)
+ private static object mod_set (Xex[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
+
+ for (int i = 1; i < args.Length; i++)
+ n %= (int) args[i].val;
+ vari.val = n;
+ return n;
+ }
+
+ private static object logior_set (Xex[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
+
+ for (int i = 1; i < args.Length; i++)
+ n |= (int) args[i].val;
+ vari.val = n;
+ return n;
+ }
+
+ private static object logand_set (Xex[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
+
+ for (int i = 1; i < args.Length; i++)
+ n &= (int) args[i].val;
+ vari.val = n;
+ return n;
+ }
+
+ private static object lsh (Xex[] args, Domain domain)
{
- if (key == MSymbol.symbol)
+ return (int) args[0].val << (int) args[1].val;
+ }
+
+ private static object lsh_set (Xex[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
+
+ n <<= (int) args[1].val;
+ vari.val = n;
+ return n;
+ }
+
+ private static object rsh (Xex[] args, Domain domain)
+ {
+ return (int) args[0].val >> (int) args[1].val;
+ }
+
+ private static object rsh_set (Xex[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
+
+ n >>= (int) args[1].val;
+ vari.val = n;
+ return n;
+ }
+
+ private static object eq (Xex[] args, Domain domain)
+ {
+ int n = (int) args[0].val;
+
+ for (int i = 1; i < args.Length; i++)
+ if (n != (int) args[i].val)
+ return false;
+ return true;
+ }
+
+ private static object noteq (Xex[] args, Domain domain)
+ {
+ return ((int) args[0].val != (int) args[1].val);
+ }
+
+ private static object less_than (Xex[] args, Domain domain)
+ {
+ int n = (int) args[0].val;
+
+ for (int i = 1; i < args.Length; i++)
{
- function = Function.varref;
- args = new MExpression[1];
- args[0] = new MExpression (val);
+ int n1 = (int) args[i].val;
+ if (n >= n1)
+ return false;
+ n = n1;
}
- else if (key == MSymbol.integer
- || key == MSymbol.mtext)
+ return true;
+ }
+
+ private static object less_eq (Xex[] args, Domain domain)
+ {
+ int n = (int) args[0].val;
+ for (int i = 1; i < args.Length; i++)
{
- this.val = val;
+ int n1 = (int) args[i].val;
+ if (n > n1)
+ return false;
+ n = n1;
}
- else if (key == MSymbol.plist)
+ return true;
+ }
+
+ private static object greater_than (Xex[] args, Domain domain)
+ {
+ int n = (int) args[0].val;
+ for (int i = 1; i < args.Length; i++)
{
- MPlist p = (MPlist) val;
+ int n1 = (int) args[i].val;
+ if (n <= n1)
+ return false;
+ n = n1;
+ }
+ return true;
+ }
- if (p.IsSymbol)
- {
- MSymbol sym = p.Symbol;
-
- 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);
- }
- }
- }
- else
- {
- args = new MExpression[1];
- args[0] = new MExpression (p, domain);
- }
+ private static object greater_eq (Xex[] 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;
+ }
+
+ private static object eval_clause (Xex[] args, Domain domain)
+ {
+ return args[0].Eval (domain);
+ }
+
+ private static object progn_clause (Xex[] args, Domain domain)
+ {
+ object result = true;
+
+ foreach (Xex e in args)
+ result = e.Eval (domain);
+ return result;
+ }
+
+ private static object if_clause (Xex[] args, Domain domain)
+ {
+ object result;
+
+ if (is_true (args[0].Eval (domain)))
+ result = args[1].Eval (domain);
else
- throw new Exception ("Invalid expression: " + key + ":" + val);
+ {
+ result = false;
+ for (int i = 2; i < args.Length; i++)
+ result = args[i].Eval (domain);
+ }
+ return result;
+ }
+
+ private static object when_clause (Xex[] args, Domain domain)
+ {
+ if (! is_true (args[0].Eval (domain)))
+ return false;
+
+ object result = true;
+ for (int i = 1; i < args.Length; i++)
+ result = args[i].Eval (domain);
+ return result;
}
- public MExpression (MPlist plist, Domain domain)
+ private static object while_clause (Xex[] args, Domain domain)
{
- function = Function.block;
- args = new MExpression[plist.Count];
- for (int i = 0; ! plist.IsEmpty; i++, plist = plist.next)
+ while (is_true (args[0].Eval (domain)))
+ for (int i = 1; i < args.Length; i++)
+ args[i].Eval (domain);
+ return false;
+ }
+
+ // FUNCALL: function != null
+ // VARREF: function == null, args[0] = DIRECT-SYMBOL
+ // DIRECT: function == null, args == null
+
+ private object val;
+ public abstract object Eval (Domain domain);
+ public object Val { get { return val; } }
+
+ private class Funcall : Xex
+ {
+ internal Function func;
+ internal Xex[] args;
+
+ public Funcall (Function func, Xex[] args)
{
- domain.Translate (plist);
- args[i] = new MExpression (plist.key, plist.val, domain);
+ this.func = func;
+ this.args = args;
}
+
+ public override object Eval (Domain domain)
+ {
+ val = func.Call (args, domain);
+ return val;
+ }
+
+ public override string ToString ()
+ {
+ string str = "(" + func.name;
+ if (args != null)
+ foreach (Xex e in args)
+ str += " " + e.ToString ();
+ return (str + ")");
+ }
+ }
+
+ private class Varref : Xex
+ {
+ internal Variable vari;
+
+ public Varref (Variable vari)
+ {
+ this.vari = vari;
+ }
+
+ public override object Eval (Domain domain)
+ {
+ val = vari.val;
+ return val;
+ }
+
+ public override string ToString ()
+ {
+ return "$" + vari.name + "/" + vari.val;
+ }
}
- public MExpression (XmlNode node, Domain domain)
+ private class Const : Xex
{
- MSymbol sym = node.Name;
+ public Const (object val)
+ {
+ this.val = val;
+ }
- function = domain.GetFunc (sym);
+ public override object Eval (Domain domain)
+ {
+ return val;
+ }
- XmlAttributeCollection attrs = node.Attributes;
+ public override string ToString ()
+ {
+ return val.ToString ();
+ }
+ }
- 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];
+ internal static int parse_integer (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;
- for (i = 0; i < attrs.Count; i++)
+
+ if (c == '0' && str[1] == 'x')
+ {
+ 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;
+ }
+ if (c == '-')
+ negative = true;
+ i = c - '0';
+ for (int idx = 1; idx < len; idx++)
{
- string str = sttrs[i].Value;
+ c = str[idx];
+ if (c < '0' || c > '9')
+ break;
+ i = i * 10 + (c - '0');
+ }
+ return negative ? - i : i;
+ }
+ private static int pre_parse (XmlNodeList nlist, Domain domain)
+ {
+ int len = 0;
+ foreach (XmlNode node in nlist)
+ {
+ if (node.Name == Ndefun)
+ domain.RegisterFunction (node);
+ else if (node.Name == Ndefvar)
+ domain.Defvar ((Name) node.Attributes[0].Value, node.FirstChild);
+ else
+ len++;
}
+ return len;
}
- public object Eval (Domain domain)
+ private static void post_parse (XmlNodeList nlist, Xex[] args,
+ Domain domain)
{
- if (function == null)
+ for (int i = 0, j = 0; i < nlist.Count; i++)
{
- if (val is MSymbol)
- val = domain.GetValue ((MSymbol) val);
+ XmlNode node = nlist[i];
+
+ if (node.Name == Ndefun)
+ domain.Defun (node);
+ else if (node.Name != Ndefvar)
+ args[j++] = New (node, domain);
}
- else
- val = function.Call (args, domain);
- return val;
}
- public override string ToString ()
+ public static Xex New (string url, Domain domain)
{
- string str;
+ XmlDocument doc = new XmlDocument (Name.Table);
+ XmlNode node;
- if (function != null)
+ using (XmlTextReader reader = new XmlTextReader (url, Name.Table))
{
- str = "(" + function.Name.Name;
- if (args != null)
- foreach (MExpression e in args)
- str += " " + e.ToString ();
- str += ")";
+ do {
+ reader.Read ();
+ } while (reader.NodeType != XmlNodeType.None
+ && (reader.NodeType != XmlNodeType.Element
+ || Nexpr != reader.Name));
+ if (reader.NodeType == XmlNodeType.None)
+ throw new Exception ("Node <expr> not found");
+ node = doc.ReadNode (reader);
}
- else if (val != null)
+
+ return New (node, domain);
+ }
+
+ // EXPR = SYMBOL | MTEXT | INTEGER | FUNCALL | PROGN
+ // FUNCALL = '(' SYMBOL EXPR* ')'
+ // PROGN = '(' EXPR * ')'
+ public static Xex New (XmlNode node, Domain domain)
+ {
+ Name name = node.Name;
+ Xex xex;
+ if (name == Nvariable)
{
- if (val is MText)
- str = "\"" + (string) ((MText) val) + "\"";
- else
- str = val.ToString ();
+ Variable vari = domain.GetVar ((Name) node.Attributes[0].Value);
+ xex = new Xex.Varref (vari);
+ }
+ else if (name == Ninteger)
+ xex = new Xex.Const (parse_integer (node.InnerText));
+ else if (name == Nstring)
+ xex = new Xex.Const (node.InnerText);
+ else if (name == Nsymbol)
+ xex = new Xex.Const ((Name) node.InnerText);
+ else if (name == Nboolean)
+ xex = new Xex.Const (node.InnerText == "true");
+ else if (name == Nlist)
+ {
+ List<Xex> list = new List<Xex> ();
+ for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling)
+ list.Add (New (n, domain));
+ xex = new Xex.Const (list);
}
else
- str = "()";
- return str;
+ {
+ if (name == Nfuncall)
+ name = node.Attributes[0].Value;
+ Function 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);
+ nargs = pre_parse (nlist, domain);
+ Xex[] args = new Xex[nargs];
+ post_parse (nlist, args, domain);
+ xex = new Xex.Funcall (func, args);
+ }
+ return xex;
}
}
}
projects / m17n / m17n-lib-cs.git / blobdiff