{
public class Xex
{
- public class Name : IEquatable<Name>
+ public struct Name
{
private static NameTable nt = new NameTable ();
- private object name;
+ private string name;
- private Name (string str)
+ public Name (string str)
{
name = nt.Add (str);
}
- private Name (XmlAttribute attr)
+ public Name (XmlAttribute attr)
{
- name = attr.Value;
+ name = nt.Add (attr.Value);
}
- private Name (XmlNode node)
+ public Name (XmlNode node)
{
name = node.Name;
}
return new Name (str);
}
+ public static implicit operator Name (XmlAttribute attr)
+ {
+ return new Name (attr);
+ }
+
+ public static implicit operator Name (XmlNode node)
+ {
+ return new Name (node);
+ }
+
public static implicit operator string (Name name)
{
- return (string) name.name;
+ return name.name;
}
public static bool operator== (Name n1, Name n2)
{
- return n1.name == n2.name;
+ return (object) n1.name == (object) n2.name;
+ }
+
+ public static bool operator== (Name n1, string n2)
+ {
+ return (object) n1.name == (object) n2;
+ }
+
+ public static bool operator== (string n1, Name n2)
+ {
+ return (object) n1 == (object) n2.name;
}
public static bool operator!= (Name n1, Name n2)
{
- return n1.name != n2.name;
+ return (object) n1.name != (object) n2.name;
+ }
+
+ public static bool operator!= (Name n1, string n2)
+ {
+ return (object) n1.name != (object) n2;
}
- public bool Equals (Name other) { return name == other.name; }
- public override bool Equals (object obj) { return obj == name; }
+ public static bool operator!= (string n1, Name n2)
+ {
+ return (object) n1 != (object) n2.name;
+ }
+
+ public override bool Equals (object other)
+ {
+ Console.WriteLine ("Equals (object)");
+ return Object.ReferenceEquals (this, other);
+ }
+
public override int GetHashCode ()
{
- return ((string) name).GetHashCode ();
+ return name.GetHashCode ();
}
public static NameTable Table { get { return nt; } }
}
- private static Name Nvalue = "value";
- private static Name Nvar = "var";
- private static Name Ndefun = "defun";
- private static Name Ncond = "cond";
+ 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";
+
+ private static Name Nconst = "const";
+ private static Name Nvariable = "varialbe";
+
+ private static Name Nfuncall = "funcall";
+ private static Name Nmname = "mname";
private static Name Nprogn = "progn";
- private static Name Nwhen = "when";
- public class Bindings
+ internal class Function
{
- private Name name;
- private object value;
- private Bindings next;
-
- internal Bindings (Name name, object value)
+ internal class Lambda
+ {
+ internal Name[] args;
+ internal Xex[] body;
+
+ public Lambda (XmlNode node, Domain domain)
+ {
+ Set (node, domain);
+ }
+
+ 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 Name[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 Name[0];
+ if (this.body == null)
+ this.body = new Xex[body.Count - idx];
+ for (int i = 0; idx < body.Count; i++, idx++)
+ this.body[i] = new Xex (body[idx], domain);
+ }
+ }
+
+ public readonly Name name;
+ public Builtin builtin;
+ public int min_arg, max_arg;
+ internal Lambda lambda;
+ public bool specialp = false;
+
+ public Function (Name name, Builtin builtin,
+ int min_arg, int max_arg, bool specialp)
{
this.name = name;
- this.value = value;
+ this.builtin = builtin;
+ this.min_arg = min_arg;
+ this.max_arg = max_arg;
+ this.specialp = specialp;
}
-
- internal Bindings ()
+
+ internal Function (Name name, XmlNode node, Domain domain)
{
+ this.name = name;
+ lambda = new Lambda (node, domain);
+ this.min_arg = this.max_arg = lambda.args.Length;
}
-
- internal Bindings Bind (Name name, object value)
+
+ private Function ()
+ {
+ name = "nil";
+ }
+
+ public object Call (Xex[] args, Domain domain)
+ {
+ Bindings current = domain.bindings;
+ object result = false;
+
+ try {
+ if (! specialp)
+ foreach (Xex e in args)
+ e.Eval (domain);
+ if (builtin != null)
+ return builtin (args, domain);
+ if (lambda == null)
+ return null;
+
+ foreach (Xex e in lambda.body)
+ result = e.Eval (domain);
+ } finally {
+ domain.UnboundTo (current);
+ }
+ return result;
+ }
+ }
+
+ internal abstract class Variable
+ {
+ public readonly Name name;
+ public readonly Name type;
+ internal object val;
+
+ public Variable (Name name, Name type, object value)
+ {
+ this.name = name;
+ this.type = type;
+ val = value;
+ }
+
+ public object Value
+ {
+ get { return val; }
+ set
+ {
+ if (! ValueP (value))
+ throw new Exception ("Invalid value type: " + value);
+ val = value;
+ }
+ }
+
+ public abstract bool ValueP (object value);
+
+ public override string ToString () { return name + "(" + type + ")"; }
+ }
+
+ internal class VarInt : Variable
+ {
+ public struct Range
{
- Bindings bindings = new Bindings (name, value);
- bindings.next = this;
- return bindings;
+ public int from, to;
}
- internal Bindings SetBoundary ()
+ public Range[] ranges;
+
+ public VarInt (Name name, int value) : base (name, Ninteger, value) { }
+
+ public override bool ValueP (object value)
{
- Bindings bindings = new Bindings ();
- bindings.next = this;
- return this;
+ 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;
}
+ }
+
+ internal class VarStr : Variable
+ {
+ public string[] ranges;
+
+ public VarStr (Name name, string value) : base (name, Nstring, value) { }
- internal Bindings Pop ()
+ public override bool ValueP (object value)
{
- return bindings.next;
+ string str;
+
+ 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;
+ }
+ }
+
+ internal class VarBool : Variable
+ {
+ public VarBool (Name name, bool value) : base (name, Nboolean, value) { }
+
+ public override bool ValueP (object value)
+ {
+ return value is bool;
+ }
+ }
+
+ internal class VarMisc : Variable
+ {
+ public VarMisc (Name name, object value) : base (name, Nobject, value) { }
+
+ public override bool ValueP (object value)
+ {
+ return true;
+ }
+ }
+
+ internal class Bindings
+ {
+ private Variable vari;
+ private object old_value;
+ private Bindings next;
+
+ private Bindings (Variable vari, object value)
+ {
+ this.vari = vari;
+ old_value = value;
+ }
+
+ public static Bindings Bind (Bindings bindings,
+ Variable vari, object value)
+ {
+ Bindings b = new Bindings (vari, vari.val);
+
+ b.vari.Value = value;
+ b.next = bindings;
+ return b;
+ }
+
+ internal Bindings UnboundTo (Bindings boundary)
+ {
+ for (Bindings b = this; b != boundary; b = b.next)
+ vari.val = b.old_value;
+ return boundary;
}
public override string ToString ()
{
string str = "(bindings";
for (Bindings b = this; b != null; b = b.next)
- str += " " + name + ":" + value;
+ str += " " + vari;
return str + ")";
}
}
+ internal class ThrowException : Exception
+ {
+ Name tag;
+ public object value;
+
+ public ThrowException (Name tag, object value) : base ()
+ {
+ this.tag = tag;
+ this.value = value;
+ }
+ }
+
public class Domain
{
private Domain parent;
internal Dictionary<Name, Function> functions
= new Dictionary<Name, Function> ();
- private Bindings bindings;
+ internal Dictionary<Name, Variable> variables
+ = new Dictionary<Name, Variable> ();
+ internal Bindings bindings;
internal Domain () { }
this.context = context;
}
- public void Bind (Name name, object value)
+ internal void Bind (Variable vari, object value)
{
- if (bindings == null)
- bindings = new Bindings (name, value);
- else
- bindings = bindings.Bind (name, value);
+ bindings = Bindings.Bind (bindings, vari, value);
}
- public Bindings SetBoundary ()
+ internal void UnboundTo (Bindings boundary)
{
- boundaries.Push (bindings);
- return bindings;
- }
-
- public void UnboundTo (Bindings boundary)
- {
- while (boundary != boundaries.Pop ());
- while (bindings.Pop != boundary);
+ bindings = bindings.UnboundTo (boundary);
}
public void Defun (Name name, Builtin builtin, int min_arg, int max_arg)
if (func.min_arg < nargs || func.max_arg > nargs)
throw new Exception ("Incompatible argument numbers to override: "
- + sym);
+ + name);
func.lambda.Set (node, this);
func.builtin = null;
}
else
{
- func = new Function (sym, node, this);
- functions = functions.Cons (sym, func);
+ func = new Function (name, node, this);
+ functions[name] = func;
}
}
internal Function GetFunc (Name name)
{
- Function func = (Function) functions.Get (name);
+ Function func;
- if (func == null)
+ if (! functions.TryGetValue (name, out func))
{
if (parent != null)
return parent.GetFunc (name);
public bool CopyFunc (Domain domain, Name name)
{
- Function func = (Function) functions.Get (name);
- if (func == null)
- return false;
- domain.functions = domain.functions.Cons (name, func);
+ Function func = GetFunc (name);
+
+ domain.functions[name] = func;
return true;
}
public void CopyFunc (Domain domain)
{
- foreach (MPlist p in functions)
- domain.functions = domain.functions.Cons (p.key, p.val);
- }
-
- public object GetValue (Name name)
- {
- MPlist slot = bindings.Find (name);
-
- if (slot == null)
- {
- if (parent != null)
- return parent.GetValue (name);
- throw new Exception ("Unbound variable: " + name);
- }
- return slot.val;
+ foreach (KeyValuePair<Name, Function> kv in functions)
+ domain.functions[kv.Key] = kv.Value;
}
- public object SetValue (Name name, object val)
+ internal Variable GetVar (Name name)
{
- MPlist boundary = boundaries.Peek ();
+ Variable vari;
- 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;
+ if (! variables.TryGetValue (name, out vari))
+ variables[name] = vari = new VarMisc (name, null);
+ return vari;
}
- public bool IsBound (Name name)
+ internal Variable GetVar (Xex e)
{
- return (bindings.Find (name) != null);
+ if (! (e.val is Name))
+ throw new Exception ("Not a symbol" + e.val);
+ return GetVar ((Name) e.val);
}
public override string ToString ()
string str = "<(functions";
foreach (KeyValuePair<Name, Function> kv in functions)
str += " " + kv.Key;
- str += ") " + bindings;
+ str += ") (variabls";
+ foreach (KeyValuePair<Name, Variable> kv in variables)
+ str += " " + kv.Key;
+ str += " " + bindings;
if (context != null)
str += " (" + context + ")";
str += ">";
public delegate object Builtin (Xex[] args, Domain domain);
- internal class Function
- {
- internal class Lambda
- {
- internal Name[] args;
- internal Xex[] body;
-
- public Lambda (XmlNode node, Domain domain)
- {
- Set (node, domain);
- }
-
- 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 Name[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 Name[0];
- if (this.body == null)
- this.body = new Xex[body.Count - idx];
- for (int i = 0; idx < body.Count; i++, idx++)
- this.body[i] = new Xex (body[idx], domain);
- }
- }
-
- public readonly Name Name;
- public Builtin builtin;
- public int min_arg, max_arg;
- internal Lambda lambda;
- public bool specialp = false;
+ private static Domain basic = new Domain ();
- internal static Function ignore, varref, block;
-
- public Function (Name 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;
- }
-
- internal Function (Name name, XmlNode node, Domain domain)
- {
- Name = name;
- lambda = new Lambda (node, domain);
- this.min_arg = this.max_arg = lambda.args.Length;
- }
-
- private Function ()
- {
- Name = Name.nil;
- }
-
- static Function ()
- {
- ignore = new Function ();
- varref = new Function (Mvarref, get_value, 1, 1, true);
- block = new Function (Mprogn, progn, 0, -1, true);
- }
-
- private static object get_value (Xex[] args, Domain domain)
- {
- return domain.GetValue ((Name) args[0].val);
- }
-
- public object Call (Xex[] args, Domain domain)
- {
- if (builtin != null)
- {
- if (! specialp)
- foreach (Xex e in args)
- e.Eval (domain);
- return builtin (args, domain);
- }
- if (lambda == null)
- return null;
- Bindings orig_bindings = domain.bindings;
- object result = false;
- try {
- int i = 0;
- foreach (Name arg in lambda.args)
- domain.Bind (arg, args[i++].Eval (domain));
- foreach (Xex e in lambda.body)
- result = e.Eval (domain);
- } finally {
- domain.bindings = orig_bindings;
- }
- return result;
- }
- }
-
- private static Domain basic;
+ internal static Function Fprogn;
static Xex ()
{
- basic = new Domain ();
-
- basic.Defun ("set", set_value, 2, 2, true);
- basic.Defun ("=", set_value, 2, 2, true);
+ basic.Defun ("set", set_value, 2, 2, false);
+ basic.Defun ("=", set_value, 2, 2, false);
+ basic.Defun ("and", and, 1, -1, false);
+ basic.Defun ("&&", and, 1, -1, false);
+ basic.Defun ("or", or, 1, -1, false);
+ basic.Defun ("||", or, 1, -1, false);
+ basic.Defun ("not", not, 1, 1, false);
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 ("+", add, 2, -1, false);
+ basic.Defun ("*", mul, 2, -1, false);
+ basic.Defun ("-", sub, 1, -1, false);
+ basic.Defun ("/", div, 2, -1, false);
+ basic.Defun ("%", mod, 2, 2, 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 ("+=", add_set, 2, -1, true);
+ basic.Defun ("*=", mul_set, 2, -1, true);
+ basic.Defun ("-=", sub_set, 2, -1, true);
+ basic.Defun ("/=", div_set, 2, -1, true);
+ basic.Defun ("%=", mod_set, 2, 2, true);
+ basic.Defun ("|=", logior_set, 2, -1, true);
+ basic.Defun ("&=", logand_set, 2, -1, true);
+ basic.Defun ("<<", lsh, 2, 2, false);
+ basic.Defun (">>", rsh, 2, 2, false);
+ basic.Defun ("<<=", lsh_set, 2, 2, true);
+ basic.Defun (">>=", rsh_set, 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));
+ basic.Defun ("<", less_than, 2, -1, false);
+ basic.Defun ("<=", less_eq, 2, -1, false);
+ basic.Defun (">", greater_than, 2, -1, false);
+ basic.Defun (">=", greater_eq, 2, -1, false);
+ basic.Defun ("progn", progn_clause, 0, -1, true);
+ basic.Defun ("if", if_clause, 2, -1, true);
+ basic.Defun ("when", when_clause, 1, -1, true);
+ basic.Defun ("while", while_clause, 1, -1, true);
+
+ Fprogn = basic.GetFunc (Nprogn);
+ }
+
+ private static bool is_true (object val)
+ {
+ return (val is bool ? (bool) val
+ : val is int ? (int) val == 0
+ : true);
}
private static object set_value (Xex[] args, Domain domain)
{
- return domain.SetValue ((Name) args[0].args[0].val,
- args[1].Eval (domain));
+ Variable vari = domain.GetVar (args[0]);
+
+ vari.Value = args[1].val;
+ return vari.val;
}
- private static object not (Xex[] args, Domain domain)
+ private static object and (Xex[] 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);
+ foreach (Xex arg in args)
+ if (! is_true (arg.val))
+ return false;
return true;
}
- private static object plus (Xex[] args, Domain domain)
+ private static object or (Xex[] args, Domain domain)
{
- if (args[0].val is int)
- {
- int n = 0;
- foreach (Xex e in args)
- n += (int) e.val;
- return n;
- }
- else if (args[0].val is MText)
- {
- MText mt = new MText ();
- foreach (Xex e in args)
- mt += (MText) e.val;
- return mt;
- }
- throw new Exception ("Not an integer nor MText: " + args[0].val);
+ foreach (Xex arg in args)
+ if (is_true (arg.val))
+ return true;
+ return false;
+ }
+
+ private static object not (Xex[] args, Domain domain)
+ {
+ return ! is_true (args[0].val);
}
- private static object multi (Xex[] args, Domain domain)
+ private static object add (Xex[] args, Domain domain)
+ {
+ int n = 0;
+ foreach (Xex e in args)
+ n += (int) e.val;
+ return n;
+ }
+
+ private static object mul (Xex[] args, Domain domain)
{
int n = 1;
foreach (Xex e in args)
return n;
}
- private static object minus (Xex[] args, Domain domain)
+ private static object sub (Xex[] args, Domain domain)
{
int n = (int) args[0].val;
if (args.Length == 1)
return n;
}
- private static object divide (Xex[] args, Domain domain)
+ private static object div (Xex[] args, Domain domain)
{
int n = (int) args[0].val;
for (int i = 1; i < args.Length; i++)
return n;
}
- private static object percent (Xex[] args, Domain domain)
+ private static object mod (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;
+ return ((int) args[0].val % (int) args[1].val);
}
private static object logior (Xex[] args, Domain domain)
private static object logand (Xex[] args, Domain domain)
{
- int n = 0;
- foreach (Xex e in args)
- n &= (int) e.val;
+ int n = (int) args[0].val;
+ for (int i = 1; i < args.Length; i++)
+ n &= (int) args[i].val;
return n;
}
- private static object pluseq (Xex[] args, Domain domain)
+ private static object add_set (Xex[] args, Domain domain)
{
- Name sym = (Name) args[0].args[0].val;
- object val = domain.GetValue (sym);
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
- 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)
- {
- MText mt = (MText) val;
- for (int i = 1; i < args.Length; i++)
- mt.Cat ((MText) args[i].Eval (domain));
- val = mt;
- }
- domain.SetValue (sym, val);
- return val;
+ for (int i = 1; i < args.Length; i++)
+ n += (int) args[i].val;
+ vari.val = n;
+ return n;
}
- private static object multieq (Xex[] args, Domain domain)
+ private static object mul_set (Xex[] args, Domain domain)
{
- Name sym = (Name) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
for (int i = 1; i < args.Length; i++)
- n *= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ n *= (int) args[i].val;
+ vari.val = n;
+ return n;
}
- private static object minuseq (Xex[] args, Domain domain)
+ private static object sub_set (Xex[] args, Domain domain)
{
- Name sym = (Name) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
for (int i = 1; i < args.Length; i++)
- n -= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ n -= (int) args[i].val;
+ vari.val = n;
+ return n;
}
- private static object divideeq (Xex[] args, Domain domain)
+ private static object div_set (Xex[] args, Domain domain)
{
- Name sym = (Name) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
for (int i = 1; i < args.Length; i++)
- n /= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ n /= (int) args[i].val;
+ vari.val = n;
+ return n;
}
- private static object percenteq (Xex[] args, Domain domain)
+ private static object mod_set (Xex[] args, Domain domain)
{
- Name sym = (Name) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
for (int i = 1; i < args.Length; i++)
- n %= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ n %= (int) args[i].val;
+ vari.val = n;
+ return n;
}
- private static object logioreq (Xex[] args, Domain domain)
+ private static object logior_set (Xex[] args, Domain domain)
{
- Name sym = (Name) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
for (int i = 1; i < args.Length; i++)
- n |= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ n |= (int) args[i].val;
+ vari.val = n;
+ return n;
}
- private static object logandeq (Xex[] args, Domain domain)
+ private static object logand_set (Xex[] args, Domain domain)
{
- Name sym = (Name) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
for (int i = 1; i < args.Length; i++)
- n &= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ n &= (int) args[i].val;
+ vari.val = n;
+ return n;
}
- private static object lshift (Xex[] args, Domain domain)
+ private static object lsh (Xex[] args, Domain domain)
{
return (int) args[0].val << (int) args[1].val;
}
- private static object lshifteq (Xex[] args, Domain domain)
+ private static object lsh_set (Xex[] args, Domain domain)
{
- Name sym = (Name) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
- n <<= (int) args[1].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ n <<= (int) args[1].val;
+ vari.val = n;
+ return n;
}
- private static object rshift (Xex[] args, Domain domain)
+ private static object rsh (Xex[] args, Domain domain)
{
return (int) args[0].val >> (int) args[1].val;
}
- private static object rshifteq (Xex[] args, Domain domain)
+ private static object rsh_set (Xex[] args, Domain domain)
{
- Name sym = (Name) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
+ Variable vari = domain.GetVar (args[0]);
+ int n = (int) vari.val;
- n >>= (int) args[1].Eval (domain);
- return domain.SetValue (sym, (object) n);
+ n >>= (int) args[1].val;
+ vari.val = n;
+ return n;
}
private static object eq (Xex[] args, Domain domain)
return ((int) args[0].val != (int) args[1].val);
}
- private static object less (Xex[] args, Domain domain)
+ private static object less_than (Xex[] args, Domain domain)
{
int n = (int) args[0].val;
return true;
}
- private static object lesseq (Xex[] args, Domain domain)
+ private static object less_eq (Xex[] args, Domain domain)
{
int n = (int) args[0].val;
for (int i = 1; i < args.Length; i++)
return true;
}
- private static object more (Xex[] args, Domain domain)
+ private static object greater_than (Xex[] args, Domain domain)
{
int n = (int) args[0].val;
for (int i = 1; i < args.Length; i++)
return true;
}
- private static object moreeq (Xex[] args, Domain domain)
+ private static object greater_eq (Xex[] args, Domain domain)
{
int n = (int) args[0].val;
for (int i = 1; i < args.Length; i++)
return true;
}
- private static object progn (Xex[] args, Domain domain)
+ private static object progn_clause (Xex[] args, Domain domain)
{
- object result = false;
+ object result = true;
foreach (Xex e in args)
result = e.Eval (domain);
return result;
}
- private static bool check_condition (Xex condition, Domain domain)
+ private static object if_clause (Xex[] args, Domain domain)
{
- object result = condition.Eval (domain);
- return (result is bool ? (bool) result
- : result is int ? ((int) result) != 0
- : true);
- }
-
- private static object ifclause (Xex[] args, Domain domain)
- {
- object result = false;
+ object result;
- if (check_condition (args[0], domain))
+ if (is_true (args[0].Eval (domain)))
result = args[1].Eval (domain);
else
- for (int i = 2; i < args.Length; i++)
- result = args[i].Eval (domain);
+ {
+ result = false;
+ for (int i = 2; i < args.Length; i++)
+ result = args[i].Eval (domain);
+ }
return result;
}
- private static object whenclause (Xex[] args, Domain domain)
+ private static object when_clause (Xex[] args, Domain domain)
{
- object result = false;
+ if (! is_true (args[0].Eval (domain)))
+ return false;
- if (check_condition (args[0], domain))
- for (int i = 1; i < args.Length; i++)
- result = args[i].Eval (domain);
+ object result = true;
+ for (int i = 1; i < args.Length; i++)
+ result = args[i].Eval (domain);
return result;
}
- private static object whileclause (Xex[] args, Domain domain)
+ private static object while_clause (Xex[] args, Domain domain)
{
- while (check_condition (args[0], domain))
+ while (is_true (args[0].Eval (domain)))
for (int i = 1; i < args.Length; i++)
args[i].Eval (domain);
return false;
public Xex[] Args { get { return args; } }
public object Val { get { return val; } }
+ private Xex () { }
+
private Xex (object val)
{
this.val = val;
}
+ private static Xex macro_expand (Xex[] bindings, Name[] args, Xex e)
+ {
+ Xex xex;
+
+ if (e.function != null)
+ {
+ xex = new Xex ();
+ xex.function = e.function;
+ xex.args = new Xex[e.args.Length];
+ for (int i = e.args.Length - 1; i >= 0; i--)
+ xex.args[i] = macro_expand (bindings, args, e.args[i]);
+ }
+ else if (e.args != null)
+ {
+ xex = new Xex ();
+ Name name = (Name) e.args[0].val;
+ for (int i = args.Length - 1; i >= 0; i--)
+ if (args[i] == name)
+ return bindings[i];
+ xex.function = null;
+ xex.args = new Xex[1];
+ xex.args[0] = e.args[0];
+ }
+ else
+ {
+ xex = e;
+ }
+ return xex;
+ }
+
// EXPR = SYMBOL | MTEXT | INTEGER | FUNCALL | PROGN
// FUNCALL = '(' SYMBOL EXPR* ')'
// PROGN = '(' EXPR * ')'
- private Xex (XmlNode node, Domain domain)
+ public Xex (XmlNode node, Domain domain)
{
- object name = node.Name;
+ Name name = node.Name;
- if (name == Nvalue)
+ if (name == Nconst)
{
- object type = node.Attributes["type"];
+ Name type = node.Attributes["type"].Value;
if (type == Ninteger)
val = parse_integer (node.InnerText);
val = node.InnerText == "true";
else if (type == Nlist)
{
- List<Xex> list = new List<Xex>;
+ List<Xex> list = new List<Xex> ();
for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling)
list.Add (new Xex (n, domain));
val = list;
else
throw new Exception ("Unknown type: " + type);
}
- else if (name = Nval)
+ else if (name == Nvariable)
{
- name = name.Attributes[];
-
args = new Xex[1];
- args[0] = new Xex (
-
-
+ args[0] = new Xex (node.Attributes[0]);
}
- else if (key == Name.plist)
+ else
{
- MPlist p = (MPlist) val;
+ bool is_macro = false;
- if (p.IsSymbol)
+ if (name == Nfuncall)
{
- Name 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 Xex 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 Xex[nargs];
- for (int i = 0; i < nargs; i++, p = p.next)
- {
- domain.Translate (p);
- args[i] = new Xex (p.key, p.val, domain);
- }
- }
+ name = node.Attributes[0].Value;
+ if (Nmname == node.Attributes[0].Name)
+ is_macro = true;
}
- else
+ function = domain.GetFunc (name);
+
+ XmlNodeList nlist = node.ChildNodes;
+ int nargs = nlist.Count;
+
+ if (nargs < function.min_arg
+ || (function.max_arg >= 0 && nargs > function.max_arg))
+ throw new Exception ("Invalid number of arguments to: "
+ + name + " " + nargs);
+ args = new Xex[nargs];
+ for (int i = 0; i < nargs; i++)
+ args[i] = new Xex (nlist[i]);
+
+ if (is_macro)
{
- args = new Xex[1];
- args[0] = new Xex (p, domain);
+ Function.Lambda lambda = function.lambda;
+ Xex[] body = lambda.body;
+ int len = body.Length;
+ Xex[] newargs = new Xex[len];
+
+ for (int i = 0; i < len; i++)
+ newargs[i] = macro_expand (args, lambda.args, body[i]);
+ function = Fprogn;
+ args = newargs;
}
}
- else
- throw new Exception ("Invalid expression: " + key + ":" + val);
}
- public Xex (XmlNode node, Domain domain)
+ private int parse_integer (string str)
{
- Name sym = node.Name;
-
- function = domain.GetFunc (sym);
+ int len = str.Length;
+ bool negative = false;
- XmlAttributeCollection attrs = node.Attributes;
+ if (len <= 1)
+ return (len == 0 ? 0 : str[0]);
- 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 Xex[nargs];
+ int c = str[0];
int i;
- for (i = 0; i < attrs.Count; i++)
- {
- string str = attrs[i].Value;
+ 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;
+ 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;
+ for (int idx = 1; idx < len; idx++)
+ {
+ c = str[idx];
+ if (c < '0' || c > '9')
+ break;
+ i = i * 10 + (c - '0');
}
+ return negative ? - i : i;
}
public object Eval (Domain domain)
{
if (function == null)
{
- if (val is Name)
- val = domain.GetValue ((Name) val);
+ if (args != null)
+ {
+ Variable vari = domain.GetVar ((Name) args[0].val);
+ val = vari.val;
+ }
+ return val;
}
else
val = function.Call (args, domain);
if (function != null)
{
- str = "(" + function.Name.Name;
+ str = "(" + function.name;
if (args != null)
foreach (Xex e in args)
str += " " + e.ToString ();
str += ")";
}
+ else if (args != null)
+ {
+ str = (string) args[0].val;
+ }
else if (val != null)
{
- if (val is MText)
- str = "\"" + (string) ((MText) val) + "\"";
+ if (val is string)
+ str = "\"" + ((string) val) + "\"";
else
str = val.ToString ();
}
projects / m17n / m17n-lib-cs.git / commitdiff