using System.Collections;
using System.Collections.Generic;
using System.IO;
+using System.Reflection;
using System.Xml;
-namespace System.Xml.Expression
+namespace System.Xml
{
public class Xexpression
{
- public static int debug_level = 0;
+ private static int debug_depth = 0;
- public struct Name : IEquatable<Name>
+ public static int DebugDepth {
+ get { return debug_depth; }
+ set { debug_depth = value; }
+ }
+
+ public struct Symbol : IEquatable<Symbol>
{
private static NameTable nt = new NameTable ();
- internal string name;
+ private string name;
- public Name (string str)
- {
- name = nt.Add (str);
- }
+ public Symbol (string str) { name = nt.Add (str); }
- public static implicit operator Name (string str)
+ public static implicit operator Symbol (string str)
{
- return new Name (str);
+ return new Symbol (str);
}
- public static implicit operator string (Name name)
- {
- return name.name;
- }
+ public static implicit operator string (Symbol sym) { return sym.name; }
- public static bool operator== (Name n1, Name n2)
+ public static bool operator== (Symbol n1, Symbol n2)
{
return (object) n1.name == (object) n2.name;
}
- public static bool operator!= (Name n1, Name n2)
+ public static bool operator!= (Symbol n1, Symbol n2)
{
return (object) n1.name != (object) n2.name;
}
- public static bool operator== (Name n1, string n2)
+ public static bool operator== (Symbol n1, string n2)
{
return (object) n1.name == (object) n2;
}
- public static bool operator!= (Name n1, string n2)
+ public static bool operator!= (Symbol n1, string n2)
{
return (object) n1.name != (object) n2;
}
- public static bool operator== (string n1, Name n2)
+ public static bool operator== (string n1, Symbol n2)
{
return (object) n1 == (object) n2.name;
}
- public static bool operator!= (string n1, Name n2)
+ public static bool operator!= (string n1, Symbol n2)
{
return (object) n1 != (object) n2.name;
}
- public bool Equals (Name name)
+ public bool Equals (Symbol name)
{
return Object.ReferenceEquals (this.name, name.name);
}
return name.GetHashCode ();
}
- public static NameTable Table { get { return nt; } }
+ public static NameTable NameTable { get { return nt; } }
public override string ToString () { return name; }
}
- private static Name Nexpr = "expr";
-
- private static Name Nfuncall = "funcall";
- private static Name Nvarref = "varref";
- private static Name Ninteger = "integer";
- private static Name Nstring = "string";
- private static Name Nsymbol = "symbol";
- private static Name Nlist = "list";
-
- private static Name Ndefun = "defun";
- private static Name Nfname = "fname";
- private static Name Nargs = "args";
- private static Name Nargs_unevalled = "args-unevalled";
- private static Name Nfixed = "fixed";
- private static Name Noptional = "optional";
- private static Name Nrest = "rest";
-
- private static Name Ndefvar = "defvar";
- private static Name Nvname = "vname";
- private static Name Ndescription = "description";
- private static Name Nrange = "range";
-
- internal abstract class Function
+ private static Symbol Qexpr = "expr";
+
+ private static Symbol Qnull = "";
+ private static Symbol Qfuncall = "funcall";
+ private static Symbol Qinteger = "integer";
+ private static Symbol Qstring = "string";
+ private static Symbol Qsymbol = "symbol";
+ private static Symbol Qlist = "list";
+
+ public static Symbol Qdefun = "defun";
+ public static Symbol Qdefmacro = "defmacro";
+ private static Symbol Qfname = "fname";
+ private static Symbol Qargs = "args";
+ private static Symbol Qfixed = "fixed";
+ private static Symbol Qoptional = "optional";
+ private static Symbol Qrest = "rest";
+
+ public static Symbol Qdefvar = "defvar";
+ private static Symbol Qvname = "vname";
+ private static Symbol Qdescription = "description";
+ private static Symbol Qrange = "range";
+
+ public abstract class Function
{
- public Name name;
+ public Symbol name;
public int min_arg, max_arg;
public Function () { }
- public Function (Name name, int min_arg, int max_arg)
+ public Function (Symbol name, int min_arg, int max_arg)
{
this.name = name;
this.min_arg = min_arg;
public Builtin builtin;
public bool setvar;
- public Subroutine (Builtin builtin, Name name, bool setvar,
+ public Subroutine (Builtin builtin, Symbol name, bool setvar,
int min_arg, int max_arg)
: base (name, min_arg, max_arg)
{
this.builtin = builtin;
+ this.setvar = setvar;
}
public override Term Call (Domain domain, Variable vari, Term[] args)
{
- Term[] newargs = new Term[args.Length];
-
- for (int i = 0; i < args.Length; i++)
+ if (args != null)
{
- newargs[i] = args[i].Eval (domain);
- if (domain.Thrown)
- return newargs[i];
+ args = (Term[]) args.Clone ();
+ for (int i = 0; i < args.Length; i++)
+ {
+ args[i] = args[i].Eval (domain);
+ if (domain.Thrown)
+ return args[i];
+ }
}
- return builtin (domain, vari, newargs);
+ return builtin (domain, vari, args);
}
}
{
public Builtin builtin;
- public SpecialForm (Builtin builtin, Name name,
+ public SpecialForm (Builtin builtin, Symbol name,
int min_arg, int max_arg)
: base (name, min_arg, max_arg)
{
}
}
- internal class Lambda : Function
+ private static void parse_head (Domain domain, XmlNode node,
+ out Symbol name,
+ out int min_arg, out int max_arg,
+ out Variable[] args)
+ {
+ int nfixed = 0;
+ int noptional = 0;
+ int nrest = 0;
+ name = node.Attributes[Qfname].Value;
+
+ node = node.FirstChild;
+ if (node != null && node.Name == Qargs)
+ {
+ XmlNode n;
+ for (n = node.FirstChild; n != null; n = n.NextSibling)
+ {
+ if (n.Name == Qfixed)
+ nfixed++;
+ else if (n.Name == Qoptional)
+ noptional++;
+ else if (n.Name == Qrest)
+ nrest++;
+ else
+ throw new Exception ("Invalid argument type: " + n);
+ }
+ min_arg = nfixed;
+ max_arg = nfixed + noptional + nrest;
+ args = new Variable[max_arg];
+ n = node.FirstChild;
+ for (int i = 0; i < max_arg; n = n.NextSibling)
+ args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value);
+ if (nrest == 1)
+ max_arg = - max_arg;
+ }
+ else
+ {
+ min_arg = max_arg = 0;
+ args = null;
+ }
+ }
+
+ private static void parse_body (Domain domain, XmlNode node,
+ out Term[] body)
+ {
+ for (node = node.FirstChild; node != null; node = node.NextSibling)
+ if (node.Name != Qdescription
+ && node.Name != Qargs)
+ break;
+ int nterms = 0;
+ for (XmlNode n = node; n != null; n = n.NextSibling)
+ nterms++;
+ if (nterms > 0)
+ {
+ body = new Term[nterms];
+ for (nterms = 0; node != null; node = node.NextSibling, nterms++)
+ body[nterms] = new Term (domain, node);
+ }
+ else
+ body = null;
+ }
+
+ internal class Macro : Function
{
- internal bool args_evalled;
internal Variable[] args;
internal Term[] body;
- public Lambda (XmlNode node, Domain domain)
+ public Macro (Domain domain, XmlNode node)
+ {
+ parse_head (domain, node, out name, out min_arg, out max_arg,
+ out args);
+ }
+
+ public void SetBody (Domain domain, XmlNode node)
{
- int nfixed = 0;
- int noptional = 0;
- int nrest = 0;
- name = node.Attributes[Nfname].Value;
-
- node = node.FirstChild;
- if (node != null
- && (node.Name == Nargs || node.Name == Nargs_unevalled))
- {
- XmlNode n;
- args_evalled = node.Name == Nargs;
- for (n = node.FirstChild; n != null; n = n.NextSibling)
- {
- if (n.Name == Nfixed)
- nfixed++;
- else if (n.Name == Noptional)
- noptional++;
- else if (n.Name == Nrest)
- nrest++;
- else
- throw new Exception ("Invalid argument type: " + n);
+ parse_body (domain, node, out body);
+ }
+
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ Bindings current = domain.bindings;
+ Term result = Zero;
+
+ try {
+ for (int i = 0; i < min_arg; i++)
+ domain.Bind (this.args[i], args[i]);
+ if (body != null)
+ {
+ try {
+ domain.Catch (CatchTag.Return);
+ foreach (Term term in body)
+ {
+ result = term.Eval (domain);
+ if (domain.Thrown)
+ return result;
+ }
+ } finally {
+ domain.Uncatch ();
}
- min_arg = nfixed;
- max_arg = nfixed + noptional + nrest;
- args = new Variable[max_arg];
- n = node.FirstChild;
- for (int i = 0; i < max_arg; n = n.NextSibling)
- args[i++] = domain.Defvar ((Name) n.Attributes[0].Value);
- if (nrest == 1)
- max_arg = - max_arg;
- }
- else
- {
- min_arg = max_arg = 0;
- }
+ }
+ } finally {
+ domain.UnboundTo (current);
+ }
+ return result;
}
+ }
+
+ internal class Lambda : Function
+ {
+ internal Variable[] args;
+ internal Term[] body;
+
+ public Lambda (Domain domain, XmlNode node)
+ {
+ parse_head (domain, node, out name, out min_arg, out max_arg,
+ out args);
+ }
- public void SetBody (XmlNode node, Domain domain)
+ public Lambda (Domain domain, Symbol name, Symbol[] args)
+ {
+ int nfixed = 0;
+ int noptional = 0;
+ int nrest = 0;
+
+ this.name = name;
+ if (args != null)
+ {
+ int i = 0;
+ for (i = 0; i < args.Length; i++, nfixed++)
+ if (args[i] == Qoptional || args[i] == Qrest)
+ break;
+ if (i < args.Length)
+ {
+ if (args[i] == Qoptional)
+ {
+ for (i++; i < args.Length; i++, noptional++)
+ if (args[i] == Qrest)
+ break;
+ if (i < args.Length)
+ nrest = 1;
+ }
+ }
+ min_arg = nfixed;
+ max_arg = nfixed + noptional + nrest;
+ this.args = new Variable[max_arg];
+ int j;
+ for (i = j = 0; j < this.args.Length; i++)
+ if (args[i] != Qoptional || args[i] != Qrest)
+ this.args[j++] = domain.Defvar (args[i]);
+ }
+ else
+ {
+ min_arg = max_arg = 0;
+ }
+ }
+
+ public void SetBody (Domain domain, XmlNode node)
{
- for (node = node.FirstChild; node != null; node = node.NextSibling)
- if (node.Name != Ndescription
- && node.Name != Nargs
- && node.Name != Nargs_unevalled)
- break;
- int nterms = 0;
- for (XmlNode n = node; n != null; n = n.NextSibling)
- nterms++;
- if (nterms > 0)
- {
- body = new Term[nterms];
- for (nterms = 0; node != null; node = node.NextSibling, nterms++)
- body[nterms] = new Term (node, domain);
- }
+ parse_body (domain, node, out body);
+ }
+
+ public void SetBody (Term[] body)
+ {
+ this.body = body;
}
public override Term Call (Domain domain, Variable vari, Term[] args)
try {
int i;
- if (args_evalled)
+ if (args != null)
{
Term[] newargs = new Term[args.Length];
for (i = 0; i < min_arg; i++)
if (body != null)
{
try {
- if (args_evalled)
- domain.Catch (CatchTag.Return);
+ domain.Catch (CatchTag.Return);
foreach (Term term in body)
{
result = term.Eval (domain);
return result;
}
} finally {
- if (args_evalled)
- domain.Uncatch ();
+ domain.Uncatch ();
}
}
} finally {
}
}
- public class Variable : Object
+ public class Variable
{
- public readonly Name name;
- public string desc;
- internal Term default_val;
- internal Term val;
- object range;
+ public Domain domain;
+ public readonly Symbol name;
+ protected Term val;
- public Variable (Name name, Term value)
+ public Variable (Domain domain, Symbol name, Term val)
{
+ this.domain = domain;
this.name = name;
- val = value;
- default_val = Zero;
+ this.val = val;
}
public virtual bool ValueP (Term val) { return true; }
- public Variable Clone ()
+ public virtual Variable Clone (Domain domain)
{
- Variable v = new Variable (name, val);
- v.desc = desc;
- v.default_val = default_val;
- v.range = range;
- return v;
+ return new Variable (domain, name, val);
}
+ public virtual void Reset () { val = Zero; }
+
public Term Value
{
get { return val; }
}
}
- public Term DefaultValue
+ public Term SetValue (int i)
{
- get { return default_val; }
- set {
- if (! ValueP (value))
- throw new Exception ("Invalid value: " + value);
- default_val = value;
- }
+ val.intval = i;
+ val.objval = null;
+ return val;
}
- public virtual object Range
+ public Term SetValue (string s)
{
- get { return range; }
- set { range = value; }
+ val.objval = s;
+ return val;
}
- public override Term Eval (Domain domain) { return val; }
-
public override string ToString () { return name + "(" + val + ")"; }
- public class Int : Variable
+ public abstract class Typed : Variable
+ {
+ protected string desc;
+ private Term default_val;
+
+ protected Typed (Domain domain, Symbol name, Term val, string desc)
+ : base (domain, name, val)
+ {
+ this.desc = desc;
+ default_val = val;
+ }
+
+ public override void Reset () { val = default_val; }
+
+ public string Description {
+ get { return desc; }
+ set { desc = value; }
+ }
+ }
+
+ public class Int : Typed
{
- public int[] range;
+ private int[] range;
- private static bool SubsetP (int[] r1, int[] r2)
+ public bool IsSubrange (int[] r)
{
- if (r2 == null)
+ if (range == null)
return true;
- for (int i = 0; i < r1.Length; i += 2)
+ for (int i = 0; i < r.Length; i += 2)
{
int j;
- for (j = 0; j < r2.Length; j += 2)
- if (r2[j] <= r1[i] && r2[j + 1] >= r1[i + 1])
+ for (j = 0; j < range.Length; j += 2)
+ if (range[j] <= r[i] && range[j + 1] >= r[i + 1])
break;
- if (j >= r2.Length)
+ if (j >= range.Length)
return false;
}
return true;
}
- private static bool SubsetP (int val, int[] r)
- {
- if (r == null)
- return true;
- for (int i = 0; i < r.Length; i += 2)
- if (r[i] <= val && r[i + 1] >= val)
- return true;
- return false;
- }
-
- public Int (Name name, string description, int value, int[] range)
- : base (name, new Term (value))
+ public Int (Domain domain, Symbol name, int n, string desc, int[] range)
+ : base (domain, name, new Term (n), desc)
{
- if (! SubsetP (value, range))
- throw new Exception ("Invalid value: " + value);
- desc = description;
- default_val = val;
+ if (range != null && range.Length % 2 == 1)
+ throw_exception ("Range length for {0} not even", name);
this.range = range;
+ if (! ValueP (val))
+ throw_exception ("Invalid integer value for {0}: {1}", name, val);
}
public override bool ValueP (Term term)
{
if (! term.IsInt)
return false;
- return SubsetP (term.Intval, range);
+ if (range == null)
+ return true;
+ int n = term.Intval;
+ for (int i = 0; i < range.Length; i += 2)
+ if (range[i] <= n && range[i + 1] >= n)
+ return true;
+ return false;
}
- public override object Range {
- get { return range; }
- set {
- int[] r = (int[]) value;
- if (! SubsetP (r, range)
- || ! SubsetP (val.Intval, r)
- || ! SubsetP (default_val.Intval, r))
- throw new Exception ("Invalid range");
- range = r;
- }
+ public override Variable Clone (Domain domain)
+ {
+ return new Int (domain, name, val.Intval, desc, range);
}
+
+ public int[] Range { get { return range; } set { range = value; } }
}
- internal class Str : Variable
+ public class Str : Typed
{
- public string[] range;
+ private string[] range;
- private static bool SubsetP (string[] r1, string[] r2)
+ public bool IsSubrange (string[] r)
{
- foreach (string s in r1)
- if (! SubsetP (s, r2))
- return false;
+ if (range == null)
+ return true;
+ for (int i = 0; i < r.Length; i++)
+ {
+ int j;
+ for (j = 0; j < range.Length; j++)
+ if (range[j] == r[i])
+ break;
+ if (j >= range.Length)
+ return false;
+ }
return true;
}
- private static bool SubsetP (string str, string[] r)
- {
- foreach (string s in r)
- if (str == s)
- return true;
- return false;
- }
-
- public Str (Name name, string description, string value, string[] range)
- : base (name, new Term (value))
+ public Str (Domain domain, Symbol name, string str, string desc,
+ string[] range)
+ : base (domain, name, new Term (str), desc)
{
- if (! SubsetP (value, range))
- throw new Exception ("Invalid value: " + value);
- desc = description;
- default_val = val;
this.range = range;
+ if (! ValueP (val))
+ throw_exception ("Invalid string value for {0}: {1}", name, val);
}
public override bool ValueP (Term term)
{
- if (! (term.objval is string))
+ if (! term.IsStr)
return false;
- return SubsetP (term.Strval, range);
+ if (range == null)
+ return true;
+ string str = term.Strval;
+ foreach (string s in range)
+ if (str == s)
+ return true;
+ return false;
}
- public override object Range {
- get { return range; }
- set {
- string[] r = (string[]) value;
- if (! SubsetP (r, range)
- || ! SubsetP (val.Strval, r)
- || ! SubsetP (default_val.Strval, r))
- throw new Exception ("Invalid range");
- range = r;
- }
+ public override Variable Clone (Domain domain)
+ {
+ return new Str (domain, name, val.Strval, desc, range);
}
+
+ public string[] Range { get { return range; } set { range = value; } }
}
- internal class Sym : Variable
+ public class Sym : Typed
{
- public Name[] range;
+ public Symbol[] range;
- private static bool SubsetP (Name[] r1, Name[] r2)
+ public bool IsSubrange (Symbol[] r)
{
- foreach (Name n in r1)
- if (! SubsetP (n, r2))
- return false;
+ if (range == null)
+ return true;
+ for (int i = 0; i < r.Length; i++)
+ {
+ int j;
+ for (j = 0; j < range.Length; j++)
+ if (range[j] == r[i])
+ break;
+ if (j >= range.Length)
+ return false;
+ }
return true;
}
- private static bool SubsetP (Name name, Name[] r)
+ public Sym (Domain domain, Symbol name, Symbol sym, string desc,
+ Symbol[] range)
+ : base (domain, name, new Term (sym), desc)
{
- foreach (Name n in r)
- if (name == n)
- return true;
- return false;
- }
-
- public Sym (Name name, string description, Name value, Name[] range)
- : base (name, new Term (value))
- {
- if (! SubsetP (value, range))
- throw new Exception ("Invalid value: " + value);
- desc = description;
- default_val = val;
this.range = range;
+ if (! ValueP (val))
+ throw_exception ("Invalid symbol value for {0}: {1}", name, val);
}
public override bool ValueP (Term term)
{
- if (! (term.objval is Name))
+ if (! term.IsSymbol)
return false;
- return SubsetP (term.Nameval, range);
+ if (range == null)
+ return true;
+ Symbol name = term.Symval;
+ foreach (Symbol n in range)
+ if (name == n)
+ return true;
+ return false;
}
- public override object Range {
- get { return range; }
- set {
- Name[] r = (Name[]) value;
- if (! SubsetP (r, range)
- || ! SubsetP (val.Nameval, r)
- || ! SubsetP (default_val.Nameval, r))
- throw new Exception ("Invalid range");
- range = r;
- }
+ public override Variable Clone (Domain domain)
+ {
+ return new Sym (domain, name, val.Symval, desc, range);
}
+
+ public Symbol[] Range { get { return range; } set { range = value; } }
}
}
private Bindings (Variable vari)
{
this.vari = vari;
- old_value = vari.val;
+ old_value = vari.Value;
}
public static Bindings Bind (Bindings bindings, Variable vari, Term val)
internal Bindings UnboundTo (Bindings boundary)
{
for (Bindings b = this; b != boundary; b = b.next)
- b.vari.val = b.old_value;
+ b.vari.Value = b.old_value;
return boundary;
}
}
}
-#if false
- internal class ThrowException : Exception
+ private static void throw_exception (string msg)
{
- Name tag;
- public object value;
+ throw new Exception (msg);
+ }
- public ThrowException (Name tag, object value) : base ()
- {
- this.tag = tag;
- this.value = value;
- }
+ private static void throw_exception (string fmt, params object[] args)
+ {
+ throw new Exception (String.Format (fmt, args));
}
-#endif
internal class CatchTag : IEquatable<CatchTag>
{
private object val;
- public CatchTag (Name name) { val = name.name; }
+ public CatchTag (Symbol sym) { val = (string) sym; }
private CatchTag (int i) { val = i; }
public static CatchTag Return = new CatchTag (0);
public class Domain
{
+ public Symbol name;
public object context;
public int depth = 0;
- internal Dictionary<Name, Function> functions;
- internal Dictionary<Name, Dictionary<Name, Function>>
- modules = new Dictionary<Name, Dictionary<Name, Function>> ();
- internal Dictionary<Name, Variable> variables;
+ internal Dictionary<Symbol, MethodInfo> termtypes
+ = new Dictionary<Symbol, MethodInfo> ();
+ internal Dictionary<Symbol, Function> functions
+ = new Dictionary<Symbol, Function> ();
+ internal Dictionary<Symbol, Variable> variables
+ = new Dictionary<Symbol, Variable> ();
internal Bindings bindings;
private Stack<CatchTag> catch_stack = new Stack<CatchTag> ();
private int catch_count = 0;
- internal Domain ()
- {
- functions = new Dictionary<Name, Function> ();
- variables = new Dictionary<Name, Variable> ();
- }
+ internal Domain (Symbol name) { this.name = name; }
- public Domain (object context) : this (basic, context)
- {
- }
+ public Domain (Symbol name, object context)
+ : this (name, basic, context) { }
- public Domain (Domain parent, object context)
+ public Domain (Symbol name, Domain parent, object context) : this (name)
{
- functions = new Dictionary<Name, Function> (parent.functions);
- variables = new Dictionary<Name, Variable> (parent.variables);
+ termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
+ functions = new Dictionary<Symbol, Function> (parent.functions);
+ variables = new Dictionary<Symbol, Variable> (parent.variables);
this.context = context;
}
catch_count--;
}
- internal bool Thrown {
+ public bool Thrown {
get { return catch_count < catch_stack.Count; }
}
internal void ThrowBreak ()
{
if (catch_stack.Peek () != CatchTag.Break)
- throw new Exception ("No outer loop to break");
+ throw_exception ("No outer loop to break");
catch_count--;
}
}
}
+ public void DefType (Type type)
+ {
+ if (! type.IsSubclassOf (typeof (TermValue)))
+ throw new Exception ("Not a subclass of TermValue: " + type);
+ BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
+ FieldInfo finfo = type.GetField ("name", flags);
+ if (finfo == null || finfo.FieldType != typeof (Symbol))
+ throw new Exception ("No \"name\" field of string type: " + type);
+ Symbol name = (Symbol) finfo.GetValue (null);
+ if (termtypes.ContainsKey (name)
+ || functions.ContainsKey (name))
+ throw new Exception ("already defined: " + name);
+ Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
+ MethodInfo minfo = type.GetMethod ("Parser", types);
+ if (minfo == null || minfo.ReturnType != typeof (TermValue))
+ throw new Exception ("No \"Parser\" method of correct type: " + type);
+ termtypes[name] = minfo;
+ }
+
public void DefSubr (Builtin builtin, string str, bool setvar,
int min_arg, int max_arg, params string[] aliases)
{
- Name name = str;
+ Symbol name = str;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
Function func = new Function.Subroutine (builtin, name, setvar,
min_arg, max_arg);
functions[name] = func;
foreach (string a in aliases)
- functions[(Name) a] = func;
+ functions[(Symbol) a] = func;
}
public void DefSpecial (Builtin builtin, string str,
int min_arg, int max_arg,
params string[] aliases)
{
- Name name = str;
+ Symbol name = str;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
Function func = new Function.SpecialForm (builtin, name,
min_arg, max_arg);
functions[name] = func;
foreach (string a in aliases)
- functions[(Name) a] = func;
+ functions[(Symbol) a] = func;
}
public void DefAlias (string alias, string str)
{
- functions[(Name) alias] = functions[(Name) str];
+ functions[(Symbol) alias] = functions[(Symbol) str];
}
- internal Function.Lambda RegisterFunction (XmlNode node)
+ public void Defun (Symbol name, Symbol[] args, Term[] body,
+ bool prototype)
{
- Function.Lambda lambda = new Function.Lambda (node, this);
+ Function func;
- functions[lambda.name] = lambda;
- return lambda;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
+ if (prototype || ! functions.TryGetValue (name, out func))
+ {
+ func = new Function.Lambda (this, name, args);
+ functions[name] = func;
+ }
+ if (! prototype)
+ ((Function.Lambda) func).SetBody (body);
}
- public void Defun (XmlNode node)
+ public void Defun (XmlNode node, bool prototype)
{
- Name name = node.Attributes[Nfname].Value;
+ Symbol name = node.Attributes[Qfname].Value;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
Function func;
- if (! functions.TryGetValue (name, out func))
- func = RegisterFunction (node);
- ((Function.Lambda) func).SetBody (node, this);
+ if (prototype || ! functions.TryGetValue (name, out func))
+ {
+ func = new Function.Lambda (this, node);
+ functions[name] = func;
+ }
+ if (! prototype)
+ ((Function.Lambda) func).SetBody (this, node);
+ }
+
+ public void Defun (Function func)
+ {
+ functions[func.name] = func;
+ }
+
+ public void Defmacro (XmlNode node, bool prototype)
+ {
+ Symbol name = node.Attributes[Qfname].Value;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
+ Function func;
+
+ if (prototype || ! functions.TryGetValue (name, out func))
+ {
+ func = new Function.Macro (this, node);
+ functions[name] = func;
+ }
+ if (! prototype)
+ ((Function.Macro) func).SetBody (this, node);
}
- public void Defvar (XmlNode node)
+ public Variable Defvar (XmlNode node)
{
- Name name = node.Attributes[0].Value;
+ Symbol name = node.Attributes[0].Value;
String desc;
Variable vari;
node = node.FirstChild;
- if (node.Name == Ndescription)
+ if (node != null && node.Name == Qdescription)
{
desc = node.InnerText;
node = node.NextSibling;
desc = null;
if (node != null)
{
- Name type = node.Name;
+ Symbol type = node.Name;
XmlNodeList range_list = null;
int nranges = 0;
string val = node.InnerText;
nranges = range_list.Count;
}
- if (type == Ninteger)
+ if (type == Qinteger)
{
- int intval = parse_integer (val);
+ int n = parse_integer (val);
int[] range = null;
if (range_list != null)
{
range = new int[nranges * 2];
for (int i = 0; i < nranges; i++)
{
- XmlNode n = range_list[i];
- if (n.Name == Nrange)
+ XmlNode nd = range_list[i];
+ if (nd.Name == Qrange)
{
range[i * 2]
- = parse_integer (n.FirstChild.InnerText);
+ = parse_integer (nd.FirstChild.InnerText);
range[i * 2 + 1]
- = parse_integer (n.LastChild.InnerText);
+ = parse_integer (nd.LastChild.InnerText);
}
else
{
range[i * 2]
= range[i * 2 + 1]
- = parse_integer (n.InnerText);
+ = parse_integer (nd.FirstChild.InnerText);
}
}
}
-
- if (variables.TryGetValue (name, out vari))
- {
- if (! (vari is Variable.Int))
- throw new Exception ("Inalid value");
- vari = vari.Clone ();
- Term v = new Term (intval);
- vari.Value = v;
- vari.DefaultValue = v;
- if (range != null)
- vari.Range = range;
- }
- else
- vari = new Variable.Int (name, desc, intval, range);
+ vari = DefvarInt (name, n, desc, range);
}
- else if (type == Nstring)
+ else if (type == Qstring)
{
string[] range = null;
if (range_list != null)
{
range = new string[nranges];
for (int i = 0; i < nranges; i++)
- range[i] = range_list[i].InnerText;
+ range[i] = range_list[i].FirstChild.InnerText;
}
-
- if (variables.TryGetValue (name, out vari))
- {
- if (! (vari is Variable.Str))
- throw new Exception ("Invalid value");
- vari = vari.Clone ();
- Term v = new Term (val);
- vari.Value = v;
- vari.DefaultValue = v;
- if (range != null)
- vari.Range = range;
- }
- else
- vari = new Variable.Str (name, desc, val, range);
+ vari = DefvarStr (name, val, desc, range);
}
- else if (type == Nsymbol)
+ else if (type == Qsymbol)
{
- Name[] range = null;
+ Symbol[] range = null;
if (range_list != null)
{
- range = new Name[nranges];
+ range = new Symbol[nranges];
for (int i = 0; i < nranges; i++)
- range[i] = range_list[i].InnerText;
- }
-
- if (variables.TryGetValue (name, out vari))
- {
- if (! (vari is Variable.Sym))
- throw new Exception ("Invalid value");
- vari = vari.Clone ();
- Term v = new Term (val);
- vari.Value = v;
- vari.DefaultValue = v;
- if (range != null)
- vari.Range = range;
+ range[i] = range_list[i].FirstChild.InnerText;
}
- else
- vari = new Variable.Sym (name, desc, val, range);
+ vari = DefvarSym (name, (Symbol) val, desc, range);
}
else
throw new Exception ("Unknown type: " + type);
else
{
if (variables.TryGetValue (name, out vari))
- vari = vari.Clone ();
+ vari = vari.Clone (this);
else
- vari = new Variable (name, Zero);
+ vari = new Variable (this, name, Zero);
+ variables[name] = vari;
}
- variables[name] = vari;
+ return vari;
}
- public void Defvar (Variable vari)
+ public Variable Defvar (Variable vari)
{
+ vari = vari.Clone (this);
variables[vari.name] = vari;
+ return vari;
}
- internal Variable Defvar (Name name)
+ internal Variable Defvar (Symbol name)
{
- Variable vari = new Variable (name, Zero);
+ Variable vari = new Variable (this, name, Zero);
variables[name] = vari;
return vari;
}
- internal Function GetFunc (Name name)
+ public Variable DefvarInt (Symbol name, int n, string desc, int[] range)
+ {
+ Variable vari;
+
+ if (variables.TryGetValue (name, out vari))
+ {
+ Variable.Int intvari = vari as Variable.Int;
+ if (intvari == null)
+ throw new Exception ("Variable type mismatch: " + name);
+ if (range != null)
+ {
+ if (! intvari.IsSubrange (range))
+ throw new Exception ("Variable range mismatch: " + name);
+ intvari.Range = range;;
+ }
+ if (desc != null)
+ intvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.Int (this, name, n, desc, range);
+ variables[name] = vari;
+ }
+ return vari;
+ }
+
+ public Variable DefvarStr (Symbol name, string str, string desc,
+ string[] range)
+ {
+ Variable vari;
+
+ if (variables.TryGetValue (name, out vari))
+ {
+ Variable.Str strvari = vari as Variable.Str;
+ if (strvari == null)
+ throw new Exception ("Variable type mismatch: " + name);
+ if (range != null)
+ {
+ if (! strvari.IsSubrange (range))
+ throw new Exception ("Variable range mismatch: " + name);
+ strvari.Range = range;
+ }
+ if (desc != null)
+ strvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.Str (this, name, str, desc, range);
+ variables[name] = vari;
+ }
+ return vari;
+ }
+
+ public Variable DefvarSym (Symbol name, Symbol sym, string desc,
+ Symbol[] range)
+ {
+ Variable vari;
+
+ if (variables.TryGetValue (name, out vari))
+ {
+ Variable.Sym symvari = vari as Variable.Sym;
+ if (symvari == null)
+ throw new Exception ("Variable type mismatch: " + name);
+ if (range != null)
+ {
+ if (! symvari.IsSubrange (range))
+ throw new Exception ("Variable range mismatch: " + name);
+ symvari.Range = range;
+ }
+ if (desc != null)
+ symvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.Sym (this, name, sym, desc, range);
+ variables[name] = vari;
+ }
+ return vari;
+ }
+
+ internal Function GetFunc (Symbol name)
{
Function func;
return func;
}
- public bool CopyFunc (Domain domain, Name name)
+ public bool CopyFunc (Domain domain, Symbol name)
{
Function func = GetFunc (name);
public void CopyFunc (Domain domain)
{
- foreach (KeyValuePair<Name, Function> kv in functions)
+ foreach (KeyValuePair<Symbol, Function> kv in functions)
domain.functions[kv.Key] = kv.Value;
}
- public Variable GetVar (Name name)
+ public Variable GetVar (Symbol name, bool create)
{
Variable vari;
if (! variables.TryGetValue (name, out vari))
- variables[name] = vari = new Variable (name, Zero);
+ {
+ if (! create)
+ return null;
+ variables[name] = vari = new Variable (this, name, Zero);
+ }
return vari;
}
public override string ToString ()
{
string str = "<(functions";
- foreach (KeyValuePair<Name, Function> kv in functions)
+ foreach (KeyValuePair<Symbol, Function> kv in functions)
str += " " + kv.Key;
str += ") (variabls";
- foreach (KeyValuePair<Name, Variable> kv in variables)
- str += " " + kv.Key;
+ foreach (KeyValuePair<Symbol, Variable> kv in variables)
+ str += " " + kv.Value;
str += ")";
if (bindings != null)
str += " " + bindings;
return str;
}
- internal void DebugWrite (bool head, string fmt, params string[] arg)
+ internal void DebugWrite (string fmt, params string[] arg)
{
- if (debug_level > depth)
+ if (debug_depth > depth)
{
- if (head)
- {
- Console.WriteLine ();
- for (int i = 0; i < depth; i++)
- Console.Write (" ");
- }
- Console.Write (fmt, arg);
+ for (int i = 0; i < depth; i++)
+ Console.Write (" ");
+ Console.WriteLine (fmt, arg);
}
}
+
+ public object SaveValues ()
+ {
+ Dictionary<Variable,Term> values = new Dictionary<Variable,Term> ();
+
+ foreach (KeyValuePair<Symbol,Variable> kv in variables)
+ values[kv.Value] = kv.Value.Value.Clone ();
+ return values;
+ }
+
+ public void RestoreValues (object values)
+ {
+ foreach (KeyValuePair<Variable,Term> kv
+ in (Dictionary<Variable,Term>) values)
+ kv.Key.Value = kv.Value;
+ }
}
public delegate Term Builtin (Domain domain, Variable vari, Term[] args);
- private static Domain basic = new Domain ();
+ private static Domain basic = new Domain ("basic");
static Xexpression ()
{
+ basic.DefType (typeof (Varref));
+ basic.DefType (typeof (Funcall));
+
basic.DefSubr (Fset, "set", true, 1, 1, "=");
basic.DefSubr (Fnot, "not", false, 1, 1, "!");
basic.DefSubr (Fadd, "add", true, 1, -1, "+");
basic.DefSubr (Feval, "eval", false, 1, 1);
basic.DefSubr (Fbreak, "break", false, 0, 1);
basic.DefSubr (Freturn, "return", false, 0, 1);
+
basic.DefSpecial (Fand, "and", 1, -1, "&&");
basic.DefSpecial (For, "or", 1, -1, "||");
basic.DefSpecial (Fprogn, "progn", 0, -1, "expr");
private static Term Fset (Domain domain, Variable vari, Term[] args)
{
vari.Value = args[0];
- return vari.val;
+ return args[0];
}
private static Term Fnot (Domain domain, Variable vari, Term[] args)
private static Term Fadd (Domain domain, Variable vari, Term[] args)
{
- int n = vari == null ? 0 : vari.val.Intval;
+ int n = vari == null ? 0 : vari.Value.Intval;
foreach (Term arg in args)
- n += (int) arg;
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n += arg.Intval;
+ return (vari == null ? new Term (n) : vari.SetValue (n));
}
private static Term Fmul (Domain domain, Variable vari, Term[] args)
{
- int n = vari == null ? 1 : vari.val.Intval;
+ int n = vari == null ? 1 : vari.Value.Intval;
foreach (Term arg in args)
- n *= (int) arg;
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n *= arg.Intval;
+ return (vari == null ? new Term (n) : vari.SetValue (n));
}
private static Term Fsub (Domain domain, Variable vari, Term[] args)
}
else
{
- n = vari.val.Intval;
+ n = vari.Value.Intval;
i = 0;
}
while (i < args.Length)
- n -= (int) args[i++];
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n -= args[i++].Intval;
+ return (vari == null ? new Term (n) : vari.SetValue (n));
}
private static Term Fdiv (Domain domain, Variable vari, Term[] args)
}
else
{
- n = vari.val.Intval;
+ n = vari.Value.Intval;
i = 0;
}
while (i < args.Length)
n /= args[i++].Intval;
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ return (vari == null ? new Term (n) : vari.SetValue (n));
}
private static Term Fmod (Domain domain, Variable vari, Term[] args)
{
- if (vari == null)
- return (args[0].Intval % args[1].Intval);
- vari.val.intval = vari.val.Intval % args[0].Intval;
- return vari.val;
+ int n = args[0].Intval % args[1].Intval;
+
+ return (vari == null ? new Term (n) : vari.SetValue (n));
}
private static Term Flogior (Domain domain, Variable vari, Term[] args)
{
- int n = vari == null ? 0 : vari.val.Intval;
+ int n = vari == null ? 0 : vari.Value.Intval;
foreach (Term arg in args)
- n |= (int) arg;
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n |= arg.Intval;
+ return (vari == null ? new Term (n) : vari.SetValue (n));
}
private static Term Flogand (Domain domain, Variable vari, Term[] args)
}
else
{
- n = vari.val.Intval;
+ n = vari.Value.Intval;
i = 0;
}
while (i < args.Length)
- n &= (int) args[i++];
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n &= args[i++].Intval;
+ return (vari == null ? new Term (n) : vari.SetValue (n));
}
private static Term Flsh (Domain domain, Variable vari, Term[] args)
{
- if (vari == null)
- return args[0].Intval << args[1].Intval;
- vari.val.intval = vari.val.Intval << args[0].Intval;
- return vari.val;
+ int n = args[0].Intval << args[1].Intval;
+ return (vari == null ? new Term (n) : vari.SetValue (n));
}
private static Term Frsh (Domain domain, Variable vari, Term[] args)
{
- if (vari == null)
- return args[0].Intval >> args[1].Intval;
- vari.val.intval = vari.val.Intval >> args[0].Intval;
- return vari.val;
+ int n = args[0].Intval >> args[1].Intval;
+ return (vari == null ? new Term (n) : vari.SetValue (n));
}
private static Term Feq (Domain domain, Variable vari, Term[] args)
private static Term Flt (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0];
+ int n = args[0].Intval;
for (int i = 1; i < args.Length; i++)
{
- int n1 = (int) args[i];
+ int n1 = args[i].Intval;
if (n >= n1)
return Zero;
n = n1;
private static Term Fle (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0];
+ int n = args[0].Intval;
for (int i = 1; i < args.Length; i++)
{
- int n1 = (int) args[i];
+ int n1 = args[i].Intval;
if (n > n1)
return Zero;
n = n1;
private static Term Fgt (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0];
+ int n = args[0].Intval;
for (int i = 1; i < args.Length; i++)
{
- int n1 = (int) args[i];
+ int n1 = args[i].Intval;
if (n <= n1)
return Zero;
n = n1;
private static Term Fge (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0];
+ int n = args[0].Intval;
for (int i = 1; i < args.Length; i++)
{
- int n1 = (int) args[i];
+ int n1 = args[i].Intval;
if (n < n1)
return Zero;
n = n1;
if (vari == null)
list = new List<Term> ();
else
- list = vari.val.Listval;
+ list = vari.Value.Listval;
foreach (Term arg in args)
{
result.objval = list;
return result;
}
- vari.val.objval = list;
- return vari.val;
+ return vari.Value;
}
private static Term Fconcat (Domain domain, Variable vari, Term[] args)
if (vari == null)
str = "";
else
- str = vari.val.Strval;
+ str = vari.Value.Strval;
foreach (Term arg in args)
{
else
str += (char) arg.Intval;
}
+
if (vari == null)
{
- Term result;
- result.intval = 0;
- result.objval = str;
- return result;
+ Term term;
+ term.intval = 0;
+ term.objval = str;
+ return term;
}
- vari.val.objval = str;
- return vari.val;
+ return vari.SetValue (str);
}
private static Term Fnth (Domain domain, Variable vari, Term[] args)
private static Term Fins (Domain domain, Variable vari, Term[] args)
{
- if (vari.val.IsStr)
- vari.val.objval
- = vari.val.Strval.Insert (args[0].Intval, args[1].Strval);
- else if (vari.val.IsList)
- vari.val.Listval.InsertRange (args[0].Intval, args[1].Listval);
+ Term term = vari.Value;
+
+ if (term.IsStr)
+ {
+ string str = term.Strval.Insert (args[0].Intval, args[1].Strval);
+ vari.SetValue (str);
+ }
+ else if (vari.Value.IsList)
+ vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval);
else
- throw new Exception ("term is not collection: " + vari.val);
- return vari.val;
+ throw new Exception ("term is not collection: " + vari.Value);
+ return vari.Value;
}
private static Term Fdel (Domain domain, Variable vari, Term[] args)
{
- if (vari.val.IsStr)
- vari.val.objval
- = vari.val.Strval.Remove (args[0].Intval,
- args[1].Intval - args[0].Intval);
-
- else if (vari.val.IsList)
- vari.val.Listval.RemoveRange (args[0].Intval,
+ if (vari.Value.IsStr)
+ {
+ string str
+ = vari.Value.Strval.Remove (args[0].Intval,
+ args[1].Intval - args[0].Intval);
+ vari.SetValue (str);
+ }
+ else if (vari.Value.IsList)
+ vari.Value.Listval.RemoveRange (args[0].Intval,
args[1].Intval - args[0].Intval);
else
- throw new Exception ("term is not collection: " + vari.val);
- return vari.val;
+ throw new Exception ("term is not collection: " + vari.Value);
+ return vari.Value;
}
private static Term Fand (Domain domain, Variable vari, Term[] args)
if (result.IsTrue)
{
for (int i = 1; i < list.Count; i++)
- result = list[i].Eval (domain);
+ {
+ domain.depth++;
+ result = list[i].Eval (domain);
+ domain.depth--;
+ if (domain.Thrown)
+ return result;
+ }
return result;
}
}
return TermInt;
if (args[0].IsStr)
return TermStr;
- if (args[0].IsName)
- return TermName;
+ if (args[0].IsSymbol)
+ return TermSymbol;
if (args[0].IsList)
return TermList;
return TermTerm;
}
- private static Term Fcatch (Domain domain, Variable vari, Term[] args)
+ public static Term Fcatch (Domain domain, Variable vari, Term[] args)
{
Term result = Zero;
try {
- domain.Catch (new CatchTag (args[0].Nameval));
+ domain.Catch (new CatchTag (args[0].Symval));
result = args[1].Eval (domain);
} finally {
domain.Uncatch ();
return result;
}
- private static Term Fthrow (Domain domain, Variable vari, Term[] args)
+ public static Term Fthrow (Domain domain, Variable vari, Term[] args)
{
- domain.ThrowTag (new CatchTag (args[0].Nameval));
+ domain.ThrowTag (new CatchTag (args[0].Symval));
return (args.Length == 1 ? Zero : args[1]);
}
- public class Object
+ public delegate TermValue TermParser (Domain domain, XmlNode node);
+
+ public abstract class TermValue
{
public virtual Term Eval (Domain domain) { return new Term (this); }
+ public virtual TermValue Clone () { return this; }
+ }
+
+ private class Varref : TermValue
+ {
+ private static Symbol name = "varref";
+ public static Symbol Name { get { return name; } }
+
+ private Symbol vname;
+ private Variable vari;
+
+ public Varref (Symbol vname) { this.vname = vname; }
+
+ public override Term Eval (Domain domain)
+ {
+ if (vari == null || vari.domain != domain)
+ vari = domain.GetVar (vname, true);
+ return vari.Value;
+ }
+
+ public static TermValue Parser (Domain domain, XmlNode node)
+ {
+ return new Varref ((Symbol) node.Attributes[Qvname].Value);
+ }
+
+ public override string ToString ()
+ {
+ return "<varref vname=\"" + vname + "\"/>";
+ }
}
- private class Funcall : Object
+ private class Funcall : TermValue
{
+ private static Symbol name = "funcall";
+
+ public static Symbol Name { get { return name; } }
+
internal Function func;
internal Variable vari;
internal Term[] args;
- public Funcall (XmlNode node, Domain domain)
- {
- vari = null;
- Name name = node.Name;
-
- if (name == Nfuncall)
- name = node.Attributes[0].Value;
- else if (node.Attributes[Nvname] != null)
- vari = domain.GetVar (node.Attributes[Nvname].Value);
- func = domain.GetFunc (name);
- XmlNodeList nlist = node.ChildNodes;
- int nargs = nlist.Count;
-
- if (nargs < func.min_arg
- || (func.max_arg >= 0 && nargs > func.max_arg))
- throw new Exception ("Invalid number of arguments to: "
- + name + " " + nargs);
- args = new Term[nargs];
- for (int i = 0; i < nlist.Count; i++)
- args[i] = new Term (nlist[i], domain);
- }
-
- public Funcall (Domain domain, Name fname, Name vname, Term[] args)
+ public Funcall (Function func, Variable vari, Term[] args)
{
- func = domain.GetFunc (fname);
- vari = domain.GetVar (vname);
+ if (args != null)
+ {
+ int nargs = args.Length;
+ if (nargs < func.min_arg
+ || (func.max_arg >= 0 && nargs > func.max_arg))
+ throw_exception ("Invalid number of arguments to {0}: ",
+ func.name, nargs);
+ }
+ this.func = func;
+ this.vari = vari;
this.args = args;
}
+ public static TermValue Parser (Domain domain, XmlNode node)
+ {
+ Symbol fname = node.Name;
+ XmlAttribute attr;
+
+ if (fname == Qfuncall)
+ fname = node.Attributes[Qfname].Value;
+ Function func = domain.GetFunc (fname);
+ Variable vari;
+ attr = node.Attributes[Qvname];
+ vari = attr == null ? null : domain.GetVar (attr.Value, true);
+ XmlNodeList nlist = node.ChildNodes;
+ int nargs = nlist.Count;
+ Term[] args = new Term[nargs];
+ for (int i = 0; i < nargs; i++)
+ args[i] = new Term (domain, nlist[i]);
+ return new Funcall (func, vari, args);
+ }
+
public override Term Eval (Domain domain)
{
- domain.DebugWrite (true, "(({0}", func.name);
- for (int i = 0; i < args.Length; i++)
- domain.DebugWrite (false, " {0}", args[i].ToString ());
- domain.DebugWrite (false, ")");
+ domain.DebugWrite (ToString ());
domain.depth++;
Term result = func.Call (domain, vari, args);
domain.depth--;
- domain.DebugWrite (true, " ==> {0})", result.ToString ());
+ domain.DebugWrite ("=> {0}", result.ToString ());
return result;
}
+ public override TermValue Clone ()
+ {
+ return new Funcall (func, vari, args);
+ }
+
public override string ToString ()
{
- string str = "<funcall fname=\"" + func.name;
+ string str = "<" + func.name;
+ if (vari != null)
+ str += " vname=\"" + vari.name + "\"";
if (args == null)
- return str + "\"/>";
- str += "\">";
- foreach (Term e in args)
- str += e;
- return (str + "</funcall>");
+ return str + "/>";
+ str += ">";
+ if (func is Function.SpecialForm)
+ {
+ for (int i = 0; i < args.Length; i++)
+ str += ".";
+ }
+ else
+ foreach (Term e in args)
+ str += e;
+ return (str + "</" + func.name + ">");
}
}
public int intval;
public object objval;
+ // <integer>...</integer>
public Term (int i) { intval = i; objval = null; }
- public Term (Name name) { intval = 0; objval = name; }
+ // <symbol>...</symbol>
+ public Term (Symbol name) { intval = 0; objval = name; }
+ // <string>...</string>
public Term (string str) { intval = 0; objval = str; }
+ // <list>...</list>
public Term (List<Term> list) { intval = 0; objval = list; }
+
public Term (Term term) { intval = term.intval; objval = term.objval; }
- public Term (Object obj) { intval = 0; objval = obj; }
+ public Term (TermValue obj) { intval = 0; objval = obj; }
- public Term (XmlNode node, Domain domain)
+ public Term (Domain domain, XmlNode node)
{
- Name name = node.Name;
+ Symbol name = node.Name;
- if (name == Ninteger)
+ if (name == Qinteger)
{
intval = parse_integer (node.InnerText);
objval = null;
else
{
intval = 0;
- if (name == Nsymbol)
- objval = (Name) node.InnerText;
- else if (name == Nstring)
+ if (name == Qsymbol)
+ objval = (Symbol) node.InnerText;
+ else if (name == Qstring)
objval = node.InnerText.Clone ();
- else if (name == Nvarref)
- objval = domain.GetVar ((Name) node.Attributes[0].Value);
- else if (name == Nlist)
+ else if (name == Qlist)
{
List<Term> list = new List<Term> ();
for (node = node.FirstChild; node != null;
node = node.NextSibling)
- list.Add (new Term (node, domain));
+ list.Add (new Term (domain, node));
objval = list;
}
else
- objval = new Funcall (node, domain);
+ {
+ MethodInfo minfo;
+
+ if (domain.termtypes.TryGetValue (name, out minfo))
+ objval = (TermValue) minfo.Invoke (null, new Object[] { domain, node});
+ else
+ {
+ Funcall funcall = (Funcall) Funcall.Parser (domain, node);
+ if (funcall.func is Function.Macro)
+ {
+ Term result = funcall.Eval (domain);
+ intval = result.intval;
+ objval = result.objval;
+ }
+ else
+ objval = funcall;
+ }
+ }
}
}
- public int Objval {
+ // <varref vname="VNAME"/>
+ public Term (Domain domain, Symbol vname)
+ {
+ intval = 0;
+ objval = new Varref (vname);
+ }
+
+ // <funcall fname="FNAME">...</funcall>
+ public Term (Domain domain, Symbol fname, Term[] args)
+ : this (domain, fname, Qnull, args) { }
+
+ // <funcall fname="FNAME" vname="VNAME">...</funcall>
+ public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
+ {
+ intval = 0;
+
+ Function func = domain.GetFunc (fname);
+ Variable vari = vname == Qnull ? null : domain.GetVar (vname, true);
+ Funcall funcall = new Funcall (func, vari, args);
+ if (func is Function.Macro)
+ {
+ Term result = funcall.Eval (domain);
+ intval = result.intval;
+ objval = result.objval;
+ }
+ else
+ objval = funcall;
+ }
+
+ public object Objval {
get {
if (objval == null)
throw new Exception ("term is an integer: " + this);
}
}
- public string Nameval {
+ public string Symval {
get {
- if (! IsName)
+ if (! IsSymbol)
throw new Exception ("term is not symbol: " + this);
- return (Name) objval;
+ return (Symbol) objval;
}
}
}
public bool IsInt { get { return (objval == null); } }
public bool IsStr { get { return (objval is string); } }
- public bool IsName { get { return (objval is Name); } }
+ public bool IsSymbol { get { return (objval is Symbol); } }
public bool IsList { get { return (objval is List<Term>); } }
public bool IsType (Type type)
public Term Eval (Domain domain)
{
- if (objval == null || objval is Name || objval is string)
+ if (objval == null || objval is Symbol || objval is string)
return this;
if (objval is List<Term>)
return new Term ((List<Term>) objval);
- if (objval is Object)
- return ((Object) objval).Eval (domain);
- throw new Exception ("invalid Term object: " + objval);
- }
-
- public static explicit operator int (Term term)
- {
- if (term.objval != null)
- throw new Exception ("Not an integer term: " + term);
- return term.intval;
+ return ((TermValue) objval).Eval (domain);
}
- public static explicit operator Name (Term term)
+ public Term Clone ()
{
- return (Name) term.objval;
- }
-
- public static implicit operator Term (int i)
- {
- return new Term (i);
+ if (objval == null || objval is Symbol || objval is string)
+ return this;
+ if (objval is List<Term>)
+ {
+ List<Term> list = new List<Term> ();
+ list.InsertRange (0, ((List<Term>) objval));
+ return new Term (list);
+ }
+ return new Term (((TermValue) objval).Clone ());
}
public override string ToString ()
if (objval == null)
str = "<integer>" + intval + "</integer>";
- else if (objval is Name)
+ else if (objval is Symbol)
str = "<symbol>" + objval + "</symbol>";
else if (objval is string)
str = "<string>" + objval + "</string>";
str += e;
str += "</list>";
}
- else if (objval is Funcall)
- str = "<funcall fname=\"" + ((Funcall) objval).func.name + "\"/>";
- else if (objval is Variable)
- str = "<variable vname=\"" + ((Variable) objval).name + "\"/>";
else if (objval is Term)
str = "<quote>" + objval + "</quote>";
+ else if (objval is TermValue)
+ str = ((TermValue) objval).ToString ();
else
throw new Exception ("invalid Term object: " + objval);
return str;
static private Term Zero = new Term (0);
static private Term One = new Term (1);
- static private Term TermInt = new Term (Ninteger);
- static private Term TermStr = new Term (Nstring);
- static private Term TermName = new Term (Nsymbol);
- static private Term TermList = new Term (Nlist);
- static private Term TermTerm = new Term ((Name) "term");
+ static private Term TermInt = new Term (Qinteger);
+ static private Term TermStr = new Term (Qstring);
+ static private Term TermSymbol = new Term (Qsymbol);
+ static private Term TermList = new Term (Qlist);
+ static private Term TermTerm = new Term ((Symbol) "term");
internal static int parse_integer (string str)
{
private Term[] terms;
- private void parse_terms (Domain domain, XmlNode node)
+ public static Term[] ParseTerms (Domain domain, XmlNode node)
{
int nterms = 0;
for (XmlNode n = node; n != null; n = n.NextSibling)
if (n.NodeType == XmlNodeType.Element)
{
- if (n.Name == Ndefun)
- domain.RegisterFunction (n);
- else if (n.Name == Ndefvar)
+ if (n.Name == Qdefun)
+ domain.Defun (n, true);
+ else if (n.Name == Qdefmacro)
+ domain.Defmacro (n, true);
+ else if (n.Name == Qdefvar)
domain.Defvar (n);
else
nterms++;
}
-
- terms = new Term[nterms];
+ Term[] terms = new Term[nterms];
int i = 0;
for (XmlNode n = node; n != null; n = n.NextSibling)
if (n.NodeType == XmlNodeType.Element)
{
- if (n.Name == Ndefun)
- domain.Defun (n);
- else if (n.Name != Ndefvar)
- terms[i++]= new Term (n, domain);
+ if (n.Name == Qdefun)
+ domain.Defun (n, false);
+ else if (n.Name == Qdefmacro)
+ domain.Defmacro (n, false);
+ else if (n.Name != Qdefvar)
+ terms[i++]= new Term (domain, n);
}
+ return terms;
+ }
+
+ public static Term Eval (Domain domain, Term[] terms)
+ {
+ Term result = new Term (0);
+ foreach (Term term in terms)
+ {
+ result = term;
+ if (result.Objval is Funcall)
+ while ((result = result.Eval (domain)).Objval is Funcall);
+ }
+ return result;
}
+
public Xexpression (Domain domain, XmlNode node)
{
- parse_terms (domain, node);
+ terms = ParseTerms (domain, node);
}
public Xexpression (Domain domain, string url)
{
- XmlDocument doc = new XmlDocument (Name.Table);
+ XmlDocument doc = new XmlDocument (Symbol.NameTable);
XmlNode node;
- using (XmlTextReader reader = new XmlTextReader (url, Name.Table))
+ using (XmlTextReader reader = new XmlTextReader (url, doc.NameTable))
{
do {
reader.Read ();
} while (reader.NodeType != XmlNodeType.None
&& (reader.NodeType != XmlNodeType.Element
- || reader.Name != Nexpr));
+ || reader.Name != Qexpr));
if (reader.NodeType == XmlNodeType.None)
throw new Exception ("Node <expr> not found");
node = doc.ReadNode (reader);
}
- parse_terms (domain, node.FirstChild);
+ terms = ParseTerms (domain, node.FirstChild);
}
public Term Eval (Domain domain)
projects / m17n / m17n-lib-cs.git / blobdiff