namespace System.Xml.Expression
{
- public class Xex
+ public abstract class Xex
{
- public struct Name
+ public static bool Debug = false;
+
+ public static void DebugWrite (string fmt, params object[] arg)
+ {
+ if (Debug)
+ Console.Write (fmt, arg);
+ }
+
+ public struct Name : IEquatable<Name>
{
private static NameTable nt = new NameTable ();
name = nt.Add (str);
}
- public Name (XmlAttribute attr)
- {
- name = nt.Add (attr.Value);
- }
-
- public Name (XmlNode node)
- {
- name = node.Name;
- }
-
public static implicit operator Name (string str)
{
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 name.name;
return (object) n1.name == (object) n2.name;
}
- public static bool operator== (Name n1, string n2)
+ public static bool operator!= (Name n1, Name n2)
{
- return (object) n1.name == (object) n2;
+ return (object) n1.name != (object) n2.name;
}
- public static bool operator== (string n1, Name n2)
+ public static bool operator== (Name n1, string n2)
{
- return (object) n1 == (object) n2.name;
+ return (object) n1.name == (object) n2;
}
- public static bool operator!= (Name n1, Name n2)
+ public static bool operator!= (Name n1, string n2)
{
- return (object) n1.name != (object) n2.name;
+ return (object) n1.name != (object) n2;
}
- public static bool operator!= (Name n1, string n2)
+ public static bool operator== (string n1, Name n2)
{
- return (object) n1.name != (object) n2;
+ return (object) n1 == (object) n2.name;
}
public static bool operator!= (string n1, Name n2)
return (object) n1 != (object) n2.name;
}
- public override bool Equals (object other)
+ public bool Equals (Name name)
+ {
+ return Object.ReferenceEquals (this.name, name.name);
+ }
+
+ public override bool Equals (object obj)
{
- Console.WriteLine ("Equals (object)");
- return Object.ReferenceEquals (this, other);
+ return Object.ReferenceEquals (this.name, obj);
}
public override int GetHashCode ()
}
public static NameTable Table { get { return nt; } }
+
+ 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 Nlist = "list";
private static Name Nobject = "object";
- private static Name Nconst = "const";
- private static Name Nvariable = "varialbe";
+ 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 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 Nfuncall = "funcall";
- private static Name Nmname = "mname";
private static Name Nprogn = "progn";
- internal class Function
+ internal abstract class Function
{
- internal class Lambda
+ public Name name;
+ public int min_arg, max_arg;
+
+ public Function () { }
+
+ public Function (Name name, int min_arg, int max_arg)
{
- internal Name[] args;
- internal Xex[] body;
+ this.name = name;
+ this.min_arg = min_arg;
+ this.max_arg = max_arg;
+ }
- public Lambda (XmlNode node, Domain domain)
- {
- Set (node, domain);
- }
+ public abstract object Call (object[] args, Domain domain);
+
+ public override string ToString ()
+ {
+ return name;
+ }
- public void Set (XmlNode node, Domain domain)
+ internal class Subroutine : Function
+ {
+ public Builtin builtin;
+
+ public Subroutine (Builtin builtin, Name name,
+ int min_arg, int max_arg)
+ : base (name, min_arg, max_arg)
+ {
+ this.builtin = builtin;
+ }
+
+ public override object Call (object[] args, Domain domain)
{
- XmlNodeList body = node.ChildNodes;
- int idx = 0;
+ object result;
- if (body[0].Name == "args")
+ for (int i = 0; i < args.Length; i++)
{
- 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++;
+ object val = ((Xex) args[i]).Eval (domain);
+ if (val == null)
+ throw new Exception (args[i] + ":evaled to null");
+ args[i] = val;
}
- 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);
+ DebugWrite ("calling (" + this);
+ foreach (object a in args)
+ DebugWrite (" " + a);
+ DebugWrite (") => ");
+ result = builtin (args, domain);
+ DebugWrite (result + "\n");
+ return result;
}
}
- 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)
+ internal class SpecialForm : Function
{
- this.name = name;
- this.builtin = builtin;
- this.min_arg = min_arg;
- this.max_arg = max_arg;
- this.specialp = specialp;
- }
+ public Builtin builtin;
- 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;
- }
+ public SpecialForm (Builtin builtin, Name name,
+ int min_arg, int max_arg)
+ : base (name, min_arg, max_arg)
+ {
+ this.builtin = builtin;
+ }
- private Function ()
- {
- name = "nil";
+ public override object Call (object[] args, Domain domain)
+ {
+ object result;
+
+ DebugWrite ("calling (" + this);
+ foreach (object a in args)
+ DebugWrite (" " + a);
+ DebugWrite (") => ");
+ result = builtin (args, domain);
+ DebugWrite (result + "\n");
+ return result;
+ }
}
- public object Call (Xex[] args, Domain domain)
+ internal class Lambda : Function
{
- 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);
+ internal bool args_evalled;
+ internal Name[] args;
+ internal Xex[] body;
+
+ public Lambda (XmlNode node)
+ {
+ int nargs = 0, noptions = 0, nrest = 0;
+ name = node.Attributes[Nfname].Value;
+
+ node = node.FirstChild;
+ if (node != null
+ && (node.Name == Nargs || node.Name == Nargs_unevalled))
+ {
+ XmlNode n;
+ args_evalled = node.Name == Nargs;
+ for (n = node.FirstChild; n != null; n = n.NextSibling)
+ {
+ if (n.Name != Nsymbol)
+ break;
+ nargs++;
+ }
+ if (n != null && n.Name == Noptional)
+ for (n = n.NextSibling; n != null; n = n.NextSibling)
+ {
+ if (n.Name == Nrest)
+ break;
+ noptions++;
+ }
+ if (n != null)
+ nrest++;
+ min_arg = nargs;
+ max_arg = nargs + noptions + nrest;
+ if (nrest == 1)
+ max_arg = - max_arg;
+ args = new Name[max_arg];
+ n = node.FirstChild;
+ for (int i = 0; i < max_arg; n = n.NextSibling)
+ if (n.Name == Nsymbol)
+ args[i++] = n.InnerText;
+ }
+ else
+ {
+ min_arg = max_arg = 0;
+ }
+ }
+
+ public void SetBody (XmlNode node, Domain domain)
+ {
+
+ for (node = node.FirstChild; node != null && node.Name != Nbody;
+ node = node.NextSibling);
+ if (node != null)
+ {
+ XmlNodeList nlist = node.ChildNodes;
+
+ body = new Xex[nlist.Count];
+ for (int i = 0; i < nlist.Count; i++)
+ body[i] = New (nlist[i], domain);
+ }
+ }
+
+ public override object Call (object[] args, Domain domain)
+ {
+ Bindings current = domain.bindings;
+ object result = false;
+
+ try {
+ int i;
+ if (args_evalled)
+ for (i = 0; i < min_arg; i++)
+ args[i] = ((Xex) args[i]).Eval (domain);
+ for (i = 0; i < min_arg; i++)
+ {
+ Variable var = domain.GetVar (this.args[i]);
+ domain.Bind (var, args[i]);
+ }
+ DebugWrite ("calling (" + this);
+ foreach (Xex e in body)
+ result = e.Eval (domain);
+ DebugWrite (") => " + result + "\n");
+ } finally {
+ domain.UnboundTo (current);
+ }
+ return result;
+ }
+
+ public override string ToString ()
+ {
+ string str = "(" + name;
+ foreach (Name a in args)
+ str += " " + a;
+ return (str + ")");
}
- return result;
}
}
public Variable (Name name, Name type, object value)
{
+ if (value != null)
+ Value = value;
this.name = name;
this.type = type;
- val = value;
}
public object Value
set
{
if (! ValueP (value))
- throw new Exception ("Invalid value type: " + value);
+ throw new Exception ("Invalid value of " + name + ": " + value);
val = value;
}
}
public abstract bool ValueP (object value);
- public override string ToString () { return name + "(" + type + ")"; }
+ public override string ToString () { return name + "=" + val; }
}
internal class VarInt : Variable
public Range[] ranges;
- public VarInt (Name name, int value) : base (name, Ninteger, value) { }
+ public VarInt (Name name, object value) : base (name, Ninteger, value) { }
public override bool ValueP (object value)
{
{
public string[] ranges;
- public VarStr (Name name, string value) : base (name, Nstring, value) { }
+ public VarStr (Name name, object value) : base (name, Nstring, value) { }
public override bool ValueP (object value)
{
internal class VarBool : Variable
{
- public VarBool (Name name, bool value) : base (name, Nboolean, value) { }
+ public VarBool (Name name, object value)
+ : base (name, Nboolean, value) { }
public override bool ValueP (object value)
{
- return value is bool;
+ if (! (value is bool))
+ return false;
+ return true;
}
}
private object old_value;
private Bindings next;
- private Bindings (Variable vari, object value)
+ private Bindings (Variable vari)
{
this.vari = vari;
- old_value = value;
+ old_value = vari.val;
}
public static Bindings Bind (Bindings bindings,
Variable vari, object value)
{
- Bindings b = new Bindings (vari, vari.val);
+ Bindings b = new Bindings (vari);
b.vari.Value = value;
b.next = bindings;
{
string str = "(bindings";
for (Bindings b = this; b != null; b = b.next)
- str += " " + vari;
+ str += " " + vari.name + "=" + b.old_value;
return str + ")";
}
}
+#if false
internal class ThrowException : Exception
{
Name tag;
this.value = value;
}
}
+#endif
public class Domain
{
- private Domain parent;
public object context;
- internal Dictionary<Name, Function> functions
- = new Dictionary<Name, Function> ();
- internal Dictionary<Name, Variable> variables
- = new Dictionary<Name, Variable> ();
+ internal Dictionary<Name, Function> functions;
+ internal Dictionary<Name, Variable> variables;
internal Bindings bindings;
- internal Domain () { }
+ internal Domain ()
+ {
+ functions = new Dictionary<Name, Function> ();
+ variables = new Dictionary<Name, Variable> ();
+ }
- public Domain (object context) : this (basic, context) { }
+ public Domain (object context) : this (basic, context)
+ {
+ }
public Domain (Domain parent, object context)
{
- this.parent = parent;
+ functions = new Dictionary<Name, Function> (parent.functions);
+ variables = new Dictionary<Name, Variable> (parent.variables);
this.context = context;
}
internal void Bind (Variable vari, object value)
{
bindings = Bindings.Bind (bindings, vari, value);
+ DebugWrite ("binding " + vari);
}
internal void UnboundTo (Bindings boundary)
{
- bindings = bindings.UnboundTo (boundary);
+ if (bindings != null)
+ bindings = bindings.UnboundTo (boundary);
}
- public void Defun (Name name, Builtin builtin, int min_arg, int max_arg)
+ public void DefSubr (Builtin builtin, string str,
+ int min_arg, int max_arg)
{
- Defun (name, builtin, min_arg, max_arg, false);
+ Name name = str;
+ functions[name]
+ = new Function.Subroutine (builtin, name, min_arg, max_arg);
}
- public void Defun (Name name, Builtin builtin, int min_arg, int max_arg,
- bool specialp)
+ public void DefSpecial (Builtin builtin, string str,
+ int min_arg, int max_arg)
{
- Function func;
+ Name name = str;
+ functions[name]
+ = new Function.SpecialForm (builtin, name, min_arg, max_arg);
+ }
- if (functions.TryGetValue (name, out func))
- {
- 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
- {
- functions[name]
- = new Function (name, builtin, min_arg, max_arg, specialp);
- }
+ internal Function.Lambda RegisterFunction (XmlNode node)
+ {
+ Function.Lambda lambda = new Function.Lambda (node);
+
+ functions[lambda.name] = lambda;
+ return lambda;
}
- public void Defun (XmlNode node)
+ internal Function Defun (XmlNode node)
{
- Name name = node.Attributes["id"];
+ Name name = node.Attributes[Nfname].Value;
Function func;
- if (functions.TryGetValue (name, out func))
+ if (! functions.TryGetValue (name, out func))
+ func = RegisterFunction (node);
+ ((Function.Lambda) func).SetBody (node, this);
+ return func;
+ }
+
+ public void Defvar (Name name, XmlNode node)
+ {
+ Variable vari;
+
+ if (node.Name == Ndescription)
+ node = node.NextSibling;
+ if (node != 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: "
- + name);
- func.lambda.Set (node, this);
- func.builtin = 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)
+ {
+ 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.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)
+ {
+ 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
- {
- func = new Function (name, node, this);
- functions[name] = func;
- }
+ vari = new VarMisc (name, null);
+ variables[name] = vari;
}
internal Function GetFunc (Name name)
Function func;
if (! functions.TryGetValue (name, out func))
- {
- if (parent != null)
- return parent.GetFunc (name);
- throw new Exception ("Unknown function: " + name);
- }
+ throw new Exception ("Unknown function: " + name);
return func;
}
return vari;
}
- internal Variable GetVar (Xex e)
- {
- 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";
str += ") (variabls";
foreach (KeyValuePair<Name, Variable> kv in variables)
str += " " + kv.Key;
- str += " " + bindings;
+ str += ")";
+ if (bindings != null)
+ str += " " + bindings;
if (context != null)
str += " (" + context + ")";
str += ">";
}
}
- public delegate object Builtin (Xex[] args, Domain domain);
+ public delegate object Builtin (object[] args, Domain domain);
private static Domain basic = new Domain ();
static Xex ()
{
- 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 ("+", 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 ("+=", 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_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);
+ basic.DefSubr (set_value, "set", 2, 2);
+ basic.DefSubr (set_value, "=", 2, 2);
+ basic.DefSpecial (and, "and", 1, -1);
+ basic.DefSpecial (and, "&&", 1, -1);
+ basic.DefSpecial (or, "or", 1, -1);
+ basic.DefSpecial (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);
}
: true);
}
- private static object set_value (Xex[] args, Domain domain)
+ private static object set_value (object[] args, Domain domain)
{
- Variable vari = domain.GetVar (args[0]);
+ Variable vari = domain.GetVar ((Name) args[0]);
- vari.Value = args[1].val;
+ vari.Value = args[1];
return vari.val;
}
- private static object and (Xex[] args, Domain domain)
+ private static object and (object[] args, Domain domain)
{
- foreach (Xex arg in args)
- if (! is_true (arg.val))
+ foreach (object arg in args)
+ if (! is_true (((Xex) arg).Eval (domain)))
return false;
return true;
}
- private static object or (Xex[] args, Domain domain)
+ private static object or (object[] args, Domain domain)
{
- foreach (Xex arg in args)
- if (is_true (arg.val))
+ foreach (object arg in args)
+ if (is_true (((Xex) arg).Eval (domain)))
return true;
return false;
}
- private static object not (Xex[] args, Domain domain)
+ private static object not (object[] args, Domain domain)
{
- return ! is_true (args[0].val);
+ return ! is_true (args);
}
- private static object add (Xex[] args, Domain domain)
+ private static object add (object[] args, Domain domain)
{
int n = 0;
- foreach (Xex e in args)
- n += (int) e.val;
+ foreach (object arg in args)
+ n += (int) arg;
return n;
}
- private static object mul (Xex[] args, Domain domain)
- {
- int n = 1;
- foreach (Xex e in args)
- n *= (int) e.val;
- return n;
- }
-
- 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 mul (object[] args, Domain domain)
+ {
+ int n = 1;
+ foreach (object arg in args)
+ n *= (int) arg;
+ return n;
+ }
- 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;
- }
+ private static object sub (object[] args, Domain domain)
+ {
+ int n = (int) args[0];
+ if (args.Length == 1)
+ return - n;
+ for (int i = 1; i < args.Length; i++)
+ n -= (int) args[i];
+ return n;
+ }
- private static object mod (Xex[] args, Domain domain)
- {
- return ((int) args[0].val % (int) args[1].val);
- }
+ private static object div (object[] args, Domain domain)
+ {
+ int n = (int) args[0];
+ for (int i = 1; i < args.Length; i++)
+ n /= (int) args[i];
+ return n;
+ }
- private static object logior (Xex[] args, Domain domain)
- {
- int n = 0;
- foreach (Xex e in args)
- n |= (int) e.val;
- return n;
- }
+ private static object mod (object[] args, Domain domain)
+ {
+ return ((int) args[0] % (int) args[1]);
+ }
- 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 logior (object[] args, Domain domain)
+ {
+ int n = 0;
+ foreach (object arg in args)
+ n |= (int) arg;
+ return n;
+ }
- private static object add_set (Xex[] args, Domain domain)
- {
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
+ private static object logand (object[] args, Domain domain)
+ {
+ int n = (int) args[0];
+ for (int i = 1; i < args.Length; i++)
+ n &= (int) args[i];
+ return n;
+ }
- for (int i = 1; i < args.Length; i++)
- n += (int) args[i].val;
- vari.val = n;
- return n;
- }
+ private static object add_set (object[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar ((Name) ((Xex.Const) args[0]).val);
+ int n = (int) vari.val;
- private static object mul_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];
+ vari.val = n;
+ return n;
+ }
- for (int i = 1; i < args.Length; i++)
- n *= (int) args[i].val;
- vari.val = n;
- return n;
- }
+ private static object mul_set (object[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar ((Name) ((Xex.Const) args[0]).val);
+ int n = (int) vari.val;
- private static object sub_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];
+ vari.val = n;
+ return n;
+ }
- for (int i = 1; i < args.Length; i++)
- n -= (int) args[i].val;
- vari.val = n;
- return n;
- }
+ private static object sub_set (object[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar ((Name) ((Xex.Const) args[0]).val);
+ int n = (int) vari.val;
- private static object div_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];
+ vari.val = n;
+ return n;
+ }
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i].val;
- vari.val = n;
- return n;
- }
+ private static object div_set (object[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar ((Name) ((Xex.Const) args[0]).val);
+ int n = (int) vari.val;
- 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];
+ vari.val = n;
+ return n;
+ }
- for (int i = 1; i < args.Length; i++)
- n %= (int) args[i].val;
- vari.val = n;
- return n;
- }
+ private static object mod_set (object[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar ((Name) ((Xex.Const) args[0]).val);
+ int n = (int) vari.val;
- 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];
+ vari.val = n;
+ return n;
+ }
- for (int i = 1; i < args.Length; i++)
- n |= (int) args[i].val;
- vari.val = n;
- return n;
- }
+ private static object logior_set (object[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar ((Name) ((Xex.Const) args[0]).val);
+ int n = (int) vari.val;
- 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];
+ vari.val = n;
+ return n;
+ }
- for (int i = 1; i < args.Length; i++)
- n &= (int) args[i].val;
- vari.val = n;
- return n;
- }
+ private static object logand_set (object[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar ((Name) ((Xex.Const) args[0]).val);
+ int n = (int) vari.val;
- private static object lsh (Xex[] args, Domain domain)
- {
- return (int) args[0].val << (int) args[1].val;
- }
+ for (int i = 1; i < args.Length; i++)
+ n &= (int) args[i];
+ vari.val = n;
+ return n;
+ }
- private static object lsh_set (Xex[] args, Domain domain)
- {
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
+ private static object lsh (object[] args, Domain domain)
+ {
+ return (int) args[0] << (int) args[1];
+ }
- n <<= (int) args[1].val;
- vari.val = n;
- return n;
- }
+ private static object lsh_set (object[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar ((Name) ((Xex.Const) args[0]).val);
+ int n = (int) vari.val;
- private static object rsh (Xex[] args, Domain domain)
- {
- return (int) args[0].val >> (int) args[1].val;
- }
+ n <<= (int) args[1];
+ vari.val = n;
+ return n;
+ }
- private static object rsh_set (Xex[] args, Domain domain)
- {
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
+ private static object rsh (object[] args, Domain domain)
+ {
+ return (int) args[0] >> (int) args[1];
+ }
- n >>= (int) args[1].val;
- vari.val = n;
- return n;
- }
+ private static object rsh_set (object[] args, Domain domain)
+ {
+ Variable vari = domain.GetVar ((Name) ((Xex.Const) args[0]).val);
+ int n = (int) vari.val;
- private static object eq (Xex[] args, Domain domain)
- {
- int n = (int) args[0].val;
+ n >>= (int) args[1];
+ vari.val = n;
+ return n;
+ }
- for (int i = 1; i < args.Length; i++)
- if (n != (int) args[i].val)
- return false;
- return true;
- }
+ private static object eq (object[] args, Domain domain)
+ {
+ object o = args[0];
- private static object noteq (Xex[] args, Domain domain)
- {
- return ((int) args[0].val != (int) args[1].val);
- }
+ for (int i = 1; i < args.Length; i++)
+ if (o != args[i])
+ return false;
+ return true;
+ }
- private static object less_than (Xex[] args, Domain domain)
- {
- int n = (int) args[0].val;
+ private static object noteq (object[] args, Domain domain)
+ {
+ return (args[0] != args[1]);
+ }
- 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 less_than (object[] args, Domain domain)
+ {
+ int n = (int) args[0];
- private static object less_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;
- }
+ for (int i = 1; i < args.Length; i++)
+ {
+ int n1 = (int) args[i];
+ if (n >= n1)
+ return false;
+ n = n1;
+ }
+ 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++)
- {
- int n1 = (int) args[i].val;
- if (n <= n1)
- return false;
- n = n1;
- }
- return true;
- }
+ private static object less_eq (object[] args, Domain domain)
+ {
+ int n = (int) args[0];
+ for (int i = 1; i < args.Length; i++)
+ {
+ int n1 = (int) args[i];
+ if (n > n1)
+ return false;
+ n = n1;
+ }
+ return true;
+ }
- 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 greater_than (object[] args, Domain domain)
+ {
+ int n = (int) args[0];
+ for (int i = 1; i < args.Length; i++)
+ {
+ int n1 = (int) args[i];
+ if (n <= n1)
+ return false;
+ n = n1;
+ }
+ return true;
+ }
- private static object progn_clause (Xex[] args, Domain domain)
- {
- object result = true;
+ private static object greater_eq (object[] args, Domain domain)
+ {
+ int n = (int) args[0];
+ for (int i = 1; i < args.Length; i++)
+ {
+ int n1 = (int) args[i];
+ if (n < n1)
+ return false;
+ n = n1;
+ }
+ return true;
+ }
- foreach (Xex e in args)
- result = e.Eval (domain);
- return result;
- }
+ private static object eval_clause (object[] args, Domain domain)
+ {
+ return ((Xex) args[0]).Eval (domain);
+ }
- private static object if_clause (Xex[] args, Domain domain)
- {
- object result;
+ private static object progn_clause (object[] args, Domain domain)
+ {
+ object result = true;
- if (is_true (args[0].Eval (domain)))
- result = args[1].Eval (domain);
- else
- {
- result = false;
- for (int i = 2; i < args.Length; i++)
- result = args[i].Eval (domain);
- }
- return result;
- }
+ foreach (object arg in args)
+ result = ((Xex) arg).Eval (domain);
+ return result;
+ }
- private static object when_clause (Xex[] args, Domain domain)
- {
- if (! is_true (args[0].Eval (domain)))
- return false;
+ private static object if_clause (object[] args, Domain domain)
+ {
+ object result;
- object result = true;
- for (int i = 1; i < args.Length; i++)
- result = args[i].Eval (domain);
- return result;
- }
+ if (is_true (((Xex) args[0]).Eval (domain)))
+ result = ((Xex) args[1]).Eval (domain);
+ else
+ {
+ result = false;
+ for (int i = 2; i < args.Length; i++)
+ result = ((Xex) args[i]).Eval (domain);
+ }
+ return result;
+ }
- private static object while_clause (Xex[] args, Domain domain)
- {
- while (is_true (args[0].Eval (domain)))
- for (int i = 1; i < args.Length; i++)
- args[i].Eval (domain);
+ private static object when_clause (object[] args, Domain domain)
+ {
+ if (! is_true (((Xex) args[0]).Eval (domain)))
return false;
- }
-
- // FUNCALL: function != null
- // VARREF: function == null, args[0] = DIRECT-SYMBOL
- // DIRECT: function == null, args == null
-
- private Function function;
- private Xex[] args;
- private object val;
- public Xex[] Args { get { return args; } }
- public object Val { get { return val; } }
-
- private Xex () { }
+ object result = true;
+ for (int i = 1; i < args.Length; i++)
+ result = ((Xex) args[i]).Eval (domain);
+ return result;
+ }
- private Xex (object val)
+ private static object while_clause (object[] args, Domain domain)
{
- this.val = val;
+ while (is_true (((Xex) args[0]).Eval (domain)))
+ for (int i = 1; i < args.Length; i++)
+ ((Xex) args[i]).Eval (domain);
+ return false;
}
- private static Xex macro_expand (Xex[] bindings, Name[] args, Xex e)
+ public abstract object Eval (Domain domain);
+ public abstract Name TypeOf { get; }
+
+ private class Funcall : Xex
{
- Xex xex;
+ internal Function func;
+ internal Xex[] args;
+ internal object[] real_args;
- 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
+ public Funcall (Function func, Xex[] args)
{
- xex = e;
+ this.func = func;
+ this.args = args;
+ real_args = new object[args.Length];
}
- return xex;
+
+ public override object Eval (Domain domain)
+ {
+ for (int i = 0; i < args.Length; i++)
+ real_args[i] = args[i];
+ return func.Call (real_args, domain);
+ }
+
+ public override Name TypeOf { get { return Nfuncall; } }
+
+ public override string ToString ()
+ {
+ string str = "(" + func.name;
+ if (args != null)
+ foreach (Xex e in args)
+ str += " " + e.ToString ();
+ return (str + ")");
+ }
}
- // EXPR = SYMBOL | MTEXT | INTEGER | FUNCALL | PROGN
- // FUNCALL = '(' SYMBOL EXPR* ')'
- // PROGN = '(' EXPR * ')'
- public Xex (XmlNode node, Domain domain)
+ private class Varref : Xex
{
- Name name = node.Name;
+ internal Variable vari;
- if (name == Nconst)
- {
- Name type = node.Attributes["type"].Value;
-
- if (type == Ninteger)
- val = parse_integer (node.InnerText);
- else if (type == Nstring)
- val = node.InnerText;
- else if (type == Nsymbol)
- val = (Name) node.InnerText;
- else if (type == Nboolean)
- val = node.InnerText == "true";
- else if (type == Nlist)
- {
- 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 == Nvariable)
- {
- args = new Xex[1];
- args[0] = new Xex (node.Attributes[0]);
- }
- else
- {
- bool is_macro = false;
+ public Varref (Variable vari) { this.vari = vari; }
- if (name == Nfuncall)
- {
- name = node.Attributes[0].Value;
- if (Nmname == node.Attributes[0].Name)
- is_macro = true;
- }
- function = domain.GetFunc (name);
+ public override object Eval (Domain domain)
+ {
+ return vari.val;
+ }
- XmlNodeList nlist = node.ChildNodes;
- int nargs = nlist.Count;
+ public override Name TypeOf { get { return Nvariable; } }
- 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]);
+ public override string ToString ()
+ {
+ return "$" + vari.name + "/" + vari.val;
+ }
+ }
- if (is_macro)
- {
- 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;
- }
- }
+ private class Const : Xex
+ {
+ public object val;
+
+ public Const (object val) { this.val = val; }
+
+ public override object Eval (Domain domain) { return val; }
+
+ public override Name TypeOf {
+ get
+ {
+ return (val is int ? Ninteger
+ : val is string ? Nstring
+ : val is bool ? Nboolean
+ : val is Name ? Nsymbol
+ : Nlist);
+ }
+ }
+
+ public override string ToString () { return val.ToString (); }
}
- private int parse_integer (string str)
+ internal static int parse_integer (string str)
{
int len = str.Length;
bool negative = false;
if (len <= 1)
- return (len == 0 ? 0 : str[0]);
+ return (len == 0 ? 0 : str[0] - '0');
int c = str[0];
int i;
if (c < '0')
break;
else if (c <= '9')
- i = i * 16 + c;
+ i = i * 16 + (c - '0');
else if (c < 'A')
break;
else if (c <= 'F')
}
if (c == '-')
negative = true;
- i = c;
+ i = c - '0';
for (int idx = 1; idx < len; idx++)
{
c = str[idx];
return negative ? - i : i;
}
- public object Eval (Domain domain)
+ private static int pre_parse (XmlNodeList nlist, Domain domain)
{
- if (function == null)
+ int len = 0;
+ foreach (XmlNode node in nlist)
{
- if (args != null)
- {
- Variable vari = domain.GetVar ((Name) args[0].val);
- val = vari.val;
- }
- return val;
+ 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;
+ }
+
+ private static void post_parse (XmlNodeList nlist, Xex[] args,
+ Domain domain)
+ {
+ for (int i = 0, j = 0; i < nlist.Count; i++)
+ {
+ 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;
- if (args != null)
- foreach (Xex 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 (args != null)
+
+ return New (node, domain);
+ }
+
+ public static Xex New (XmlNode node, Domain domain)
+ {
+ Name name = node.Name;
+ Xex xex;
+ if (name == Nvariable)
{
- str = (string) args[0].val;
+ Variable vari = domain.GetVar ((Name) node.Attributes[0].Value);
+ xex = new Xex.Varref (vari);
}
- else if (val != null)
+ 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)
{
- if (val is string)
- str = "\"" + ((string) val) + "\"";
- else
- str = val.ToString ();
+ 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