{
public static int debug_level = 0;
- public struct Name : IEquatable<Name>
+ public struct Symbol : IEquatable<Symbol>
{
private static NameTable nt = new NameTable ();
- private string name;
+ internal string name;
- public Name (string 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)
+ public static implicit operator string (Symbol name)
{
return name.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);
}
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";
-
- private static Name Nbreak = "break";
- private static Name Nreturn = "return";
-
- internal abstract class Function
+ private static Symbol Nexpr = "expr";
+
+ private static Symbol Nnull = "";
+ private static Symbol Nfuncall = "funcall";
+ private static Symbol Nvarref = "varref";
+ private static Symbol Ninteger = "integer";
+ private static Symbol Nstring = "string";
+ private static Symbol Nsymbol = "symbol";
+ private static Symbol Nlist = "list";
+
+ private static Symbol Ndefun = "defun";
+ private static Symbol Nfname = "fname";
+ private static Symbol Nargs = "args";
+ private static Symbol Nargs_unevalled = "args-unevalled";
+ private static Symbol Nfixed = "fixed";
+ private static Symbol Noptional = "optional";
+ private static Symbol Nrest = "rest";
+
+ private static Symbol Ndefvar = "defvar";
+ private static Symbol Nvname = "vname";
+ private static Symbol Ndescription = "description";
+ private static Symbol Nrange = "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)
{
public override Term Call (Domain domain, Variable vari, Term[] args)
{
- Term[] newargs = new Term[args.Length];
-
+ args = (Term[]) args.Clone ();
for (int i = 0; i < args.Length; i++)
{
- newargs[i] = args[i].Eval (domain);
+ args[i] = args[i].Eval (domain);
if (domain.Thrown)
- return newargs[i];
+ 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 Variable[] args;
internal Term[] body;
- public Lambda (XmlNode node, Domain domain)
- {
- int nfixed = 0;
- int noptional = 0;
- int nrest = 0;
- name = node.Attributes[Nfname].Value;
+ public Lambda (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);
- }
- 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;
- }
- }
+ 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);
+ }
+ 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;
+ }
+ }
+
+ public Lambda (Domain domain, Symbol name, bool args_evalled, Symbol[] args)
+ {
+ int nfixed = 0;
+ int noptional = 0;
+ int nrest = 0;
+
+ this.name = name;
+ this.args_evalled = args_evalled;
+ if (args != null)
+ {
+ int i = 0;
+ for (i = 0; i < args.Length; i++, nfixed++)
+ if (args[i] == Noptional || args[i] == Nrest)
+ break;
+ if (i < args.Length)
+ {
+ if (args[i] == Noptional)
+ {
+ for (i++; i < args.Length; i++, noptional++)
+ if (args[i] == Nrest)
+ 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] != Noptional || args[i] != Nrest)
+ this.args[j++] = domain.Defvar (args[i]);
+ }
+ else
+ {
+ min_arg = max_arg = 0;
+ }
+ }
- public void SetBody (XmlNode node, Domain domain)
+ public void SetBody (Domain domain, XmlNode node)
{
for (node = node.FirstChild; node != null; node = node.NextSibling)
if (node.Name != Ndescription
{
body = new Term[nterms];
for (nterms = 0; node != null; node = node.NextSibling, nterms++)
- body[nterms] = new Term (node, domain);
+ body[nterms] = new Term (domain, node);
}
}
+ public void SetBody (Term[] body)
+ {
+ this.body = body;
+ }
+
public override Term Call (Domain domain, Variable vari, Term[] args)
{
Bindings current = domain.bindings;
{
try {
if (args_evalled)
- domain.Catch (Nreturn);
+ domain.Catch (CatchTag.Return);
foreach (Term term in body)
{
result = term.Eval (domain);
}
}
- public class Variable : Object
+ public class Variable : TermValue
{
- public readonly Name name;
+ public readonly Symbol name;
+ public string desc;
+ internal Term default_val;
internal Term val;
+ object range;
- public Variable (Name name, Term term)
+ public Variable (Symbol name, Term value)
{
this.name = name;
- val = term;
+ val = value;
+ default_val = Zero;
+ }
+
+ public virtual bool ValueP (Term val) { return true; }
+
+ public override TermValue Clone ()
+ {
+ Variable v = new Variable (name, val);
+ v.desc = desc;
+ v.default_val = default_val;
+ v.range = range;
+ return v;
}
- public virtual Term Value
+ public Term Value
{
get { return val; }
- set
- {
- if (! ValueP (value))
- throw new Exception ("Invalid value of " + name + ": " + value);
- val = value;
- }
+ set {
+ if (! ValueP (value))
+ throw new Exception ("Invalid value: " + value);
+ val = value;
+ }
}
- public override Term Eval (Domain domain) { return val; }
+ public Term DefaultValue
+ {
+ get { return default_val; }
+ set {
+ if (! ValueP (value))
+ throw new Exception ("Invalid value: " + value);
+ default_val = value;
+ }
+ }
+
+ public virtual object Range
+ {
+ get { return range; }
+ set { range = value; }
+ }
- public virtual bool ValueP (Term term) { return true; }
+ public override Term Eval (Domain domain) { return val; }
public override string ToString () { return name + "(" + val + ")"; }
- internal class Int : Variable
+ public class Int : Variable
{
- public struct Range
- {
- public int from, to;
- }
+ public int[] range;
+
+ private static bool SubsetP (int[] r1, int[] r2)
+ {
+ if (r2 == null)
+ return true;
+ for (int i = 0; i < r1.Length; i += 2)
+ {
+ int j;
+ for (j = 0; j < r2.Length; j += 2)
+ if (r2[j] <= r1[i] && r2[j + 1] >= r1[i + 1])
+ break;
+ if (j >= r2.Length)
+ return false;
+ }
+ return true;
+ }
- public Range[] ranges;
+ 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, int i) : base (name, new Term (i)) { }
+ public Int (Symbol name, string description, int value, int[] range)
+ : base (name, new Term (value))
+ {
+ if (! SubsetP (value, range))
+ throw new Exception ("Invalid value: " + value);
+ desc = description;
+ default_val = val;
+ this.range = range;
+ }
public override bool ValueP (Term term)
{
- int i;
-
- if (term.objval != null)
+ if (! term.IsInt)
return false;
- if (ranges == null)
- return true;
- i = term.intval;
- foreach (Range r in ranges)
- if (i >= r.from && i <= r.to)
- return true;
- return false;
+ return SubsetP (term.Intval, range);
+ }
+
+ 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;
+ }
}
}
- internal class Str : Variable
+ public class Str : Variable
{
- public string[] ranges;
+ public string[] range;
+
+ private static bool SubsetP (string[] r1, string[] r2)
+ {
+ if (r2 == null)
+ return true;
+ foreach (string s in r1)
+ if (! SubsetP (s, r2))
+ return false;
+ return true;
+ }
- public Str (Name name, string str) : base (name, new Term (str)) { }
+ private static bool SubsetP (string str, string[] r)
+ {
+ if (r == null)
+ return true;
+ foreach (string s in r)
+ if (str == s)
+ return true;
+ return false;
+ }
+
+ public Str (Symbol name, string description, string value, string[] range)
+ : base (name, new Term (value))
+ {
+ if (! SubsetP (value, range))
+ throw new Exception ("Invalid value: " + value);
+ desc = description;
+ default_val = val;
+ this.range = range;
+ }
public override bool ValueP (Term term)
{
if (! (term.objval is string))
return false;
- if (ranges == null)
+ return SubsetP (term.Strval, range);
+ }
+
+ 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 class Sym : Variable
+ {
+ public Symbol[] range;
+
+ private static bool SubsetP (Symbol[] r1, Symbol[] r2)
+ {
+ if (r2 == null)
+ return true;
+ foreach (Symbol n in r1)
+ if (! SubsetP (n, r2))
+ return false;
return true;
- string str = (string) term.objval;
- foreach (string s in ranges)
- if (s == str)
+ }
+
+ private static bool SubsetP (Symbol name, Symbol[] r)
+ {
+ if (r == null)
return true;
- return false;
+ foreach (Symbol n in r)
+ if (name == n)
+ return true;
+ return false;
+ }
+
+ public Sym (Symbol name, string description, Symbol value, Symbol[] range)
+ : base (name, new Term (value))
+ {
+ if (! SubsetP (value, range))
+ throw new Exception ("Invalid value: " + value);
+ desc = description;
+ default_val = val;
+ this.range = range;
+ }
+
+ public override bool ValueP (Term term)
+ {
+ if (! (term.objval is Symbol))
+ return false;
+ return SubsetP (term.Symval, range);
+ }
+
+ public override object Range {
+ get { return range; }
+ set {
+ Symbol[] r = (Symbol[]) value;
+ if (! SubsetP (r, range)
+ || ! SubsetP (val.Symval, r)
+ || ! SubsetP (default_val.Symval, r))
+ throw new Exception ("Invalid range");
+ range = r;
+ }
}
}
}
#if false
internal class ThrowException : Exception
{
- Name tag;
+ Symbol tag;
public object value;
- public ThrowException (Name tag, object value) : base ()
+ public ThrowException (Symbol tag, object value) : base ()
{
this.tag = tag;
this.value = value;
}
#endif
+ internal class CatchTag : IEquatable<CatchTag>
+ {
+ private object val;
+
+ public CatchTag (Symbol name) { val = name.name; }
+ private CatchTag (int i) { val = i; }
+
+ public static CatchTag Return = new CatchTag (0);
+ public static CatchTag Break = new CatchTag (1);
+
+ public static bool operator== (CatchTag t1, CatchTag t2)
+ { return t1.val == t2.val; }
+
+ public static bool operator!= (CatchTag t1, CatchTag t2)
+ { return t1.val != t2.val; }
+
+ public bool Equals (CatchTag tag) { return this.val == tag.val; }
+ public override bool Equals (object val) { return this.val == val; }
+
+ public override int GetHashCode () { return val.GetHashCode (); }
+ }
+
public class Domain
{
public object context;
public int depth = 0;
- internal Dictionary<Name, Function> functions;
- internal Dictionary<Name, Variable> variables;
+ internal Dictionary<Symbol, TermType> termtypes
+ = new Dictionary<Symbol, TermType> ();
+ internal Dictionary<Symbol, Function> functions
+ = new Dictionary<Symbol, Function> ();
+ internal Dictionary<Symbol, Variable> variables
+ = new Dictionary<Symbol, Variable> ();
internal Bindings bindings;
- private Stack<Name> catch_stack = new Stack<Name> ();
+ 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 () { }
- public Domain (object context) : this (basic, context)
- {
- }
+ public Domain (object context) : this (basic, context) { }
public Domain (Domain parent, object context)
{
- functions = new Dictionary<Name, Function> (parent.functions);
- variables = new Dictionary<Name, Variable> (parent.variables);
+ termtypes = new Dictionary<Symbol, TermType> (parent.termtypes);
+ functions = new Dictionary<Symbol, Function> (parent.functions);
+ variables = new Dictionary<Symbol, Variable> (parent.variables);
this.context = context;
}
bindings = bindings.UnboundTo (boundary);
}
- internal void Catch (Name name)
+ internal void Catch (CatchTag tag)
{
- catch_stack.Push (name);
+ catch_stack.Push (tag);
catch_count++;
}
catch_count--;
}
- internal bool Thrown {
+ public bool Thrown {
get { return catch_count < catch_stack.Count; }
}
internal void ThrowReturn ()
{
- foreach (Name tag in catch_stack)
+ foreach (CatchTag tag in catch_stack)
{
catch_count--;
- if (tag == Nreturn)
+ if (tag == CatchTag.Return)
break;
}
}
internal void ThrowBreak ()
{
- if (catch_stack.Peek () != Nbreak)
+ if (catch_stack.Peek () != CatchTag.Break)
throw new Exception ("No outer loop to break");
catch_count--;
}
+ internal void ThrowTag (CatchTag tag)
+ {
+ foreach (CatchTag elt in catch_stack)
+ {
+ catch_count--;
+ if (elt == tag)
+ break;
+ }
+ }
+
+ public void DefTerm (Symbol name, TermParser parser)
+ {
+ termtypes[name] = new TermType (name, parser);
+ }
+
public void DefSubr (Builtin builtin, string str, bool setvar,
int min_arg, int max_arg, params string[] aliases)
{
- Name name = str;
+ Symbol name = str;
Function func = new Function.Subroutine (builtin, name, setvar,
min_arg, max_arg);
functions[name] = func;
foreach (string a in aliases)
- functions[(Name) a] = func;
+ 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;
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, bool args_evalled,
+ Symbol[] args, Term[] body, bool prototype)
{
- Function.Lambda lambda = new Function.Lambda (node, this);
+ Function func;
- functions[lambda.name] = lambda;
- return lambda;
+ if (prototype || ! functions.TryGetValue (name, out func))
+ {
+ func = new Function.Lambda (this, name, args_evalled, args);
+ functions[name] = func;
+ }
+ if (! prototype)
+ ((Function.Lambda) func).SetBody (body);
}
- internal Function Defun (XmlNode node)
+ public void Defun (XmlNode node, bool prototype)
{
- Name name = node.Attributes[Nfname].Value;
+ Symbol name = node.Attributes[Nfname].Value;
Function func;
- if (! functions.TryGetValue (name, out func))
- func = RegisterFunction (node);
- ((Function.Lambda) func).SetBody (node, this);
- return func;
+ 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 Defvar (XmlNode node)
+ public void Defun (Function func)
{
- Name name = node.Attributes[0].Value;
+ functions[func.name] = func;
+ }
+
+ public Variable Defvar (XmlNode node)
+ {
+ Symbol name = node.Attributes[0].Value;
+ String desc;
Variable vari;
node = node.FirstChild;
- if (node.Name == Ndescription)
- node = node.NextSibling;
+ if (node != null && node.Name == Ndescription)
+ {
+ desc = node.InnerText;
+ node = node.NextSibling;
+ }
+ else
+ desc = null;
if (node != null)
{
- Name type = node.Name;
+ Symbol type = node.Name;
XmlNodeList range_list = null;
int nranges = 0;
string val = node.InnerText;
if (type == Ninteger)
{
- Variable.Int vi = new Variable.Int (name, parse_integer (val));
+ int intval = parse_integer (val);
+ int[] range = null;
if (range_list != null)
{
- vi.ranges = new Variable.Int.Range[nranges];
-
+ range = new int[nranges * 2];
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);
+ range[i * 2]
+ = parse_integer (n.FirstChild.InnerText);
+ range[i * 2 + 1]
+ = parse_integer (n.LastChild.InnerText);
}
else
{
- int num = parse_integer (n.InnerText);
- vi.ranges[i].from = vi.ranges[i].to = num;
+ range[i * 2]
+ = range[i * 2 + 1]
+ = parse_integer (n.FirstChild.InnerText);
}
}
}
- vari = vi;
+
+ if (variables.TryGetValue (name, out vari))
+ {
+ if (! (vari is Variable.Int))
+ throw new Exception ("Inalid value");
+ vari = (Variable) 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);
}
else if (type == Nstring)
{
- Variable.Str vs = new Variable.Str (name, val);
+ string[] range = null;
+ if (range_list != null)
+ {
+ range = new string[nranges];
+ for (int i = 0; i < nranges; i++)
+ range[i] = range_list[i].FirstChild.InnerText;
+ }
+
+ if (variables.TryGetValue (name, out vari))
+ {
+ if (! (vari is Variable.Str))
+ throw new Exception ("Invalid value");
+ vari = (Variable) 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);
+ }
+ else if (type == Nsymbol)
+ {
+ Symbol[] range = null;
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;
+ {
+ range = new Symbol[nranges];
+ for (int i = 0; i < nranges; i++)
+ range[i] = range_list[i].FirstChild.InnerText;
+ }
+
+ if (variables.TryGetValue (name, out vari))
+ {
+ if (! (vari is Variable.Sym))
+ throw new Exception ("Invalid value");
+ vari = (Variable) vari.Clone ();
+ Term v = new Term (val);
+ vari.Value = v;
+ vari.DefaultValue = v;
+ if (range != null)
+ vari.Range = range;
+ }
+ else
+ vari = new Variable.Sym (name, desc, val, range);
}
else
throw new Exception ("Unknown type: " + type);
}
else
- vari = new Variable (name, Zero);
+ {
+ if (variables.TryGetValue (name, out vari))
+ vari = (Variable) vari.Clone ();
+ else
+ vari = new Variable (name, Zero);
+ }
variables[name] = vari;
+ return vari;
+ }
+
+ public Variable Defvar (Variable vari)
+ {
+ variables[vari.name] = vari;
+ return vari;
}
- internal Variable Defvar (Name name)
+ internal Variable Defvar (Symbol name)
{
Variable vari = new Variable (name, Zero);
variables[name] = vari;
return vari;
}
- internal Function GetFunc (Name name)
+ 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;
}
- internal 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 (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)
+ foreach (KeyValuePair<Symbol, Variable> kv in variables)
str += " " + kv.Key;
str += ")";
if (bindings != null)
Console.Write (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.val.Clone ();
+ return values;
+ }
+
+ public void RestoreValues (object values)
+ {
+ foreach (KeyValuePair<Variable,Term> kv
+ in (Dictionary<Variable,Term>) values)
+ kv.Key.val = kv.Value;
+ }
}
public delegate Term Builtin (Domain domain, Variable vari, Term[] args);
static Xexpression ()
{
+ basic.DefTerm ("funcall", Funcall.parser);
+
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");
basic.DefSpecial (Fforeach, "foreach", 2, -1);
basic.DefSpecial (Fquote, "quote", 1, 1);
basic.DefSpecial (Ftype, "type", 1, 1);
+ basic.DefSpecial (Fcatch, "catch", 2, 2);
+ basic.DefSpecial (Fthrow, "throw", 1, 2);
}
private static Term Fset (Domain domain, Variable vari, Term[] args)
int n = vari == null ? 0 : vari.val.Intval;
foreach (Term arg in args)
- n += (int) arg;
+ n += arg.Intval;
if (vari == null)
- return n;
+ return new Term (n);
vari.val.intval = n;
return vari.val;
}
{
int n = vari == null ? 1 : vari.val.Intval;
foreach (Term arg in args)
- n *= (int) arg;
+ n *= arg.Intval;
if (vari == null)
- return n;
+ return new Term (n);
vari.val.intval = n;
return vari.val;
}
i = 0;
}
while (i < args.Length)
- n -= (int) args[i++];
+ n -= args[i++].Intval;
if (vari == null)
- return n;
+ return new Term (n);
vari.val.intval = n;
return vari.val;
}
while (i < args.Length)
n /= args[i++].Intval;
if (vari == null)
- return n;
+ return new Term (n);
vari.val.intval = n;
return vari.val;
}
private static Term Fmod (Domain domain, Variable vari, Term[] args)
{
if (vari == null)
- return (args[0].Intval % args[1].Intval);
+ return new Term (args[0].Intval % args[1].Intval);
vari.val.intval = vari.val.Intval % args[0].Intval;
return vari.val;
}
{
int n = vari == null ? 0 : vari.val.Intval;
foreach (Term arg in args)
- n |= (int) arg;
+ n |= arg.Intval;
if (vari == null)
- return n;
+ return new Term (n);
vari.val.intval = n;
return vari.val;
}
i = 0;
}
while (i < args.Length)
- n &= (int) args[i++];
+ n &= args[i++].Intval;
if (vari == null)
- return n;
+ return new Term (n);
vari.val.intval = n;
return vari.val;
}
private static Term Flsh (Domain domain, Variable vari, Term[] args)
{
if (vari == null)
- return args[0].Intval << args[1].Intval;
+ return new Term (args[0].Intval << args[1].Intval);
vari.val.intval = vari.val.Intval << args[0].Intval;
return vari.val;
}
private static Term Frsh (Domain domain, Variable vari, Term[] args)
{
if (vari == null)
- return args[0].Intval >> args[1].Intval;
+ return new Term (args[0].Intval >> args[1].Intval);
vari.val.intval = vari.val.Intval >> args[0].Intval;
return vari.val;
}
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;
result.objval = list;
return result;
}
- vari.val.objval = list;
return vari.val;
}
{
Term result = Zero;
try {
- domain.Catch (Nbreak);
+ domain.Catch (CatchTag.Break);
while (! domain.Thrown)
foreach (Term arg in args)
{
{
Term result = Zero;
try {
- domain.Catch (Nbreak);
+ domain.Catch (CatchTag.Break);
while (! domain.Thrown && args[0].Eval (domain).IsTrue)
for (int i = 1; i < args.Length; i++)
{
Bindings current = domain.bindings;
try {
- domain.Catch (Nbreak);
+ domain.Catch (CatchTag.Break);
foreach (Term term in list)
{
domain.Bind (vari, term);
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;
}
- public abstract class Object
+ public static Term Fcatch (Domain domain, Variable vari, Term[] args)
+ {
+ Term result = Zero;
+ try {
+ domain.Catch (new CatchTag (args[0].Symval));
+ result = args[1].Eval (domain);
+ } finally {
+ domain.Uncatch ();
+ }
+ return result;
+ }
+
+ public static Term Fthrow (Domain domain, Variable vari, Term[] args)
+ {
+ domain.ThrowTag (new CatchTag (args[0].Symval));
+ return (args.Length == 1 ? Zero : args[1]);
+ }
+
+ public delegate TermValue TermParser (Domain domain, XmlNode node);
+
+ public class TermType
+ {
+ public readonly Symbol type;
+ internal readonly TermParser parser;
+
+ public TermType (Symbol type, TermParser parser)
+ {
+ this.type = type;
+ this.parser = parser;
+ }
+ }
+
+ public abstract class TermValue
{
- public abstract Term Eval (Domain domain);
+ public virtual Term Eval (Domain domain) { return new Term (this); }
+ public abstract TermValue Clone ();
}
- private class Funcall : Object
+ private class Funcall : TermValue
{
internal Function func;
internal Variable vari;
internal Term[] args;
- public Funcall (Function func, Variable vari, Term[] args)
- {
- this.func = func;
- this.vari = vari;
- this.args = args;
- }
+ private Funcall (Function func, Variable vari, Term[] args)
+ {
+ this.func = func;
+ this.vari = vari;
+ this.args = args;
+ }
+
+ public Funcall (Domain domain, Symbol fname, Term[] args)
+ {
+ func = domain.GetFunc (fname);
+ this.args = args;
+ }
+
+ public Funcall (Domain domain, Symbol fname, Symbol vname, Term[] args)
+ {
+ func = domain.GetFunc (fname);
+ int nargs = args.Length;
+ if (nargs < func.min_arg
+ || (func.max_arg >= 0 && nargs > func.max_arg))
+ throw new Exception ("Invalid number of arguments to: "
+ + fname + " " + nargs);
+ this.args = args;
+ if (vname != Nnull)
+ vari = domain.GetVar (vname, true);
+ }
+
+ internal static TermValue parser (Domain domain, XmlNode node)
+ {
+ Symbol fname = node.Name;
+ Symbol vname = Nnull;
+ XmlAttribute attr;
+
+ if (fname == Nfuncall)
+ fname = node.Attributes[Nfname].Value;
+ attr = node.Attributes[Nvname];
+ if (attr != null)
+ vname = attr.Value;
+
+ 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 (domain, fname, vname, args);
+ }
public override Term Eval (Domain domain)
{
return result;
}
+ public override TermValue Clone ()
+ {
+ return new Funcall (func, vari, args);
+ }
+
public override string ToString ()
{
string str = "<funcall fname=\"" + func.name;
public object objval;
public Term (int i) { intval = i; objval = null; }
- public Term (Name name) { intval = 0; objval = name; }
+ public Term (Symbol name) { intval = 0; objval = name; }
public Term (string str) { intval = 0; objval = str; }
public Term (List<Term> list) { intval = 0; objval = list; }
- public Term (Term term) { intval = 0; objval = term; }
- public Term (Object obj) { intval = 0; objval = obj; }
+ public Term (Term term) { intval = term.intval; objval = term.objval; }
+ 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)
{
{
intval = 0;
if (name == Nsymbol)
- objval = (Name) node.InnerText;
+ objval = (Symbol) node.InnerText;
else if (name == Nstring)
objval = node.InnerText.Clone ();
else if (name == Nvarref)
- objval = domain.GetVar ((Name) node.Attributes[0].Value);
+ objval = domain.GetVar ((Symbol) node.Attributes[0].Value, true);
else if (name == Nlist)
{
List<Term> list = new List<Term> ();
for (node = node.FirstChild; node != null;
node = node.NextSibling)
- list.Add (new Term (node, domain));
+ list.Add (new Term (domain, node));
objval = list;
}
else
{
- Function func;
- Variable vari = null;
- Term[] args;
-
- if (name == Nfuncall)
- name = node.Attributes[0].Value;
- else if (node.Attributes[Nvname] != null)
- vari = domain.GetVar (node.Attributes[Nvname].Value);
- func = domain.GetFunc (name);
- XmlNodeList nlist = node.ChildNodes;
- int nargs = nlist.Count;
-
- if (nargs < func.min_arg
- || (func.max_arg >= 0 && nargs > func.max_arg))
- throw new Exception ("Invalid number of arguments to: "
- + name + " " + nargs);
- args = new Term[nargs];
- for (int i = 0; i < nlist.Count; i++)
- args[i] = new Term (nlist[i], domain);
- objval = new Funcall (func, vari, args);
+ TermType term_type;
+
+ if (domain.termtypes.TryGetValue (name, out term_type))
+ objval = term_type.parser (domain, node);
+ else
+ objval = Funcall.parser (domain, node);
}
}
}
+ public Term (Domain domain, Symbol fname, Term[] args)
+ {
+ intval = 0;
+ objval = new Funcall (domain, fname, args);
+ }
+
+ public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
+ {
+ intval = 0;
+ objval = new Funcall (domain, fname, vname, args);
+ }
+
+ public object Objval {
+ get {
+ if (objval == null)
+ throw new Exception ("term is an integer: " + this);
+ return objval;
+ }
+ }
+
public int Intval {
get {
if (objval != null)
}
}
+ public string Symval {
+ get {
+ if (! IsSymbol)
+ throw new Exception ("term is not symbol: " + this);
+ return (Symbol) objval;
+ }
+ }
+
public List<Term> Listval {
get {
if (! IsList)
}
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)
+ {
+ return (objval == null ? type == typeof (int)
+ : type == objval.GetType ());
+ }
+
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);
- if (objval is Variable)
- return ((Variable) objval).val;
- if (objval is Term)
- return (Term) objval;
- throw new Exception ("invalid Term object: " + objval);
- }
-
- public static explicit operator int (Term term)
- {
- if (term.objval != null)
- throw new Exception ("Not an integer term: " + term);
- return term.intval;
- }
-
- public static explicit operator Name (Term term)
- {
- return (Name) term.objval;
+ return ((TermValue) objval).Eval (domain);
}
- public static implicit operator Term (int i)
+ public Term Clone ()
{
- 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>";
}
}
- static Term Zero = new Term (0);
- static Term One = new Term (1);
- static Term TermInt = new Term (Ninteger);
- static Term TermStr = new Term (Nstring);
- static Term TermName = new Term (Nsymbol);
- static Term TermList = new Term (Nlist);
- static Term TermTerm = new Term ((Name) "term");
+ 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 TermSymbol = new Term (Nsymbol);
+ static private Term TermList = new Term (Nlist);
+ static private Term TermTerm = new Term ((Symbol) "term");
internal static int parse_integer (string str)
{
if (c == '?')
return str[1];
- if (c == '0' && str[1] == 'x')
+ if ((c == '0' || c == '#') && str[1] == 'x')
{
i = 0;
for (int idx = 2; idx < len; idx++)
private Term[] terms;
- public Xexpression (string url, Domain domain)
+ private void parse_terms (Domain domain, XmlNode node)
{
- XmlDocument doc = new XmlDocument (Name.Table);
- XmlNode node;
-
- using (XmlTextReader reader = new XmlTextReader (url, Name.Table))
- {
- do {
- reader.Read ();
- } while (reader.NodeType != XmlNodeType.None
- && (reader.NodeType != XmlNodeType.Element
- || reader.Name != Nexpr));
- if (reader.NodeType == XmlNodeType.None)
- throw new Exception ("Node <expr> not found");
- node = doc.ReadNode (reader);
- }
-
int nterms = 0;
- for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling)
+ for (XmlNode n = node; n != null; n = n.NextSibling)
if (n.NodeType == XmlNodeType.Element)
{
if (n.Name == Ndefun)
- domain.RegisterFunction (n);
+ domain.Defun (n, true);
else if (n.Name == Ndefvar)
domain.Defvar (n);
else
terms = new Term[nterms];
int i = 0;
- for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling)
+ for (XmlNode n = node; n != null; n = n.NextSibling)
if (n.NodeType == XmlNodeType.Element)
{
if (n.Name == Ndefun)
- domain.Defun (n);
+ domain.Defun (n, false);
else if (n.Name != Ndefvar)
- terms[i++]= new Term (n, domain);
+ terms[i++]= new Term (domain, n);
}
}
+ public Xexpression (Domain domain, XmlNode node)
+ {
+ parse_terms (domain, node);
+ }
+
+ public Xexpression (Domain domain, string url)
+ {
+ XmlDocument doc = new XmlDocument (Symbol.Table);
+ XmlNode node;
+
+ using (XmlTextReader reader = new XmlTextReader (url, Symbol.Table))
+ {
+ do {
+ reader.Read ();
+ } while (reader.NodeType != XmlNodeType.None
+ && (reader.NodeType != XmlNodeType.Element
+ || reader.Name != Nexpr));
+ if (reader.NodeType == XmlNodeType.None)
+ throw new Exception ("Node <expr> not found");
+ node = doc.ReadNode (reader);
+ }
+ parse_terms (domain, node.FirstChild);
+ }
+
public Term Eval (Domain domain)
{
Term result = Zero;
domain.depth = 0;
try {
- domain.Catch (Nreturn);
+ domain.Catch (CatchTag.Return);
foreach (Term term in terms)
{
result = term.Eval (domain);
projects / m17n / m17n-lib-cs.git / blobdiff