using System.Collections;
using System.Collections.Generic;
using System.IO;
+using System.Reflection;
+using System.Text;
+using System.Text.RegularExpressions;
using System.Xml;
-namespace System.Xml.Expression
+namespace System.Xml
{
- public class Xex
+ /// <summary>
+ /// Static class to provide XmlExpression loader and evaluator.
+ /// </summary>
+ public static class Xexpression
{
- public struct Name : IEquatable<Name>
+ /// <summary>
+ /// Exception thrown while loading and evaluating XmlExpression.
+ /// </summary>
+ public class Error : Exception
{
- private static NameTable nt = new NameTable ();
+ private readonly Symbol name;
+ private Term[] stack;
+ private XmlNode node;
- private string name;
+ public Error (Symbol name, XmlNode node,
+ string fmt, params object[] args)
+ : base (String.Format (fmt, args))
+ {
+ this.name = name;
+ this.node = node;
+ }
- public Name (string str)
+ public Error (Symbol name, XmlNode node, Exception e,
+ string fmt, params object[] args)
+ : base (String.Format (fmt, args), e)
{
- name = nt.Add (str);
+ this.name = name;
+ this.node = node;
}
- public static implicit operator Name (string str)
+ public Error (Symbol name, string fmt, params object[] args)
+ : base (String.Format (fmt, args))
+ {
+ this.name = name;
+ }
+
+ public Symbol Name { get { return name; } }
+ public XmlNode Node {
+ get { return node; }
+ internal set { node = value; }
+ }
+ public Term[] Stack {
+ get { return stack; }
+ internal set { stack = value; }
+ }
+
+ public override string ToString ()
{
- return new Name (str);
+ string str = (InnerException != null ? InnerException.ToString ()
+ : base.ToString ()) + "\n" + "Xexpression:" + name + "\n";
+ if (node != null)
+ str += " at " + node.OuterXml + "\n";
+ if (stack != null)
+ {
+ str += "Call stack: ";
+ foreach (Term term in stack)
+ str += term.ToString (false);
+ }
+ return str;
}
- public static implicit operator string (Name name)
+ // All time errors.
+ // System.OutOfMemoryException or System.InsufficientMemoryException
+ public static Symbol MemoryError = "memory-error";
+ // System.Exception
+ public static Symbol UnknownError = "unknown-error";
+ public static Symbol WrongArgument = "wrong-argument";
+
+ // Load time errors.
+ public static Symbol InvalidInteger = "invalid-integer";
+ public static Symbol TermTypeInvalid = "term-type-invalid";
+ public static Symbol FunctionConflict = "function-conflict";
+ public static Symbol VariableTypeConflict = "variable-type-conflict";
+ public static Symbol VariableRangeConflict = "variable-range-conflict";
+ public static Symbol VariableWrongRange = "variable-wrong-range";
+ public static Symbol VariableWrongValue = "variable-wrong-value";
+
+ public static Symbol UnknownFunction = "unknown-function";
+ public static Symbol MacroExpansionError = "macro-expansion-error";
+ public static Symbol NoVariableName = "no-variable-anme";
+
+ // Run time errors.
+ public static Symbol ArithmeticError = "arithmetic-error";
+ public static Symbol WrongType = "wrong-type";
+ public static Symbol IndexOutOfRange = "index-out-of-range";
+ public static Symbol ValueOutOfRange = "value-out-of-range";
+ public static Symbol NoLoopToBreak = "no-loop-to-break";
+ public static Symbol UncaughtThrow = "uncaught-throw";
+ }
+
+ public struct Symbol : IEquatable<Symbol>
+ {
+ private static NameTable nt = new NameTable ();
+
+ private string name;
+
+ public Symbol (string str) { name = nt.Add (str); }
+
+ public static implicit operator Symbol (string str)
{
- return name.name;
+ return new Symbol (str);
}
- public static bool operator== (Name n1, Name n2)
+ public static implicit operator string (Symbol sym) { return sym.name; }
+
+ 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 bool Equals (object obj)
{
- return Object.ReferenceEquals (this.name, obj);
+ return (obj is Symbol ? this == (Symbol) obj
+ : obj is string ? this.name == (string) obj
+ : false);
}
public override int GetHashCode ()
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 Ntype = "type";
+ private static Symbol Qexpr = "expr";
- private static Name Ninteger = "integer";
- private static Name Nstring = "string";
- private static Name Nboolean = "boolean";
- private static Name Nsymbol = "symbol";
- private static Name Nlist = "list";
- private static Name Nobject = "object";
+ private static 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";
- private static Name Ndefun = "defun";
- private static Name Nfname = "fname";
- private static Name Nargs = "args";
- private static Name Noptional = "optional";
- private static Name Nrest = "rest";
- private static Name Nbody = "body";
+ 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";
- private static Name Ndefvar = "defvar";
- private static Name Nconst = "const";
- private static Name Nvariable = "variable";
- private static Name Ndescription = "description";
- private static Name Npossible_value = "possible-value";
+ public static Symbol Qdefvar = "defvar";
+ private static Symbol Qvname = "vname";
+ private static Symbol Qdescription = "description";
+ private static Symbol Qrange = "range";
- private static Name Nfuncall = "funcall";
- private static Name Nprogn = "progn";
+ private static Symbol Qename = "ename";
- internal class Function
+ public class Variable
{
- internal class Lambda
+ public Domain domain;
+ public readonly Symbol name;
+ protected Term val;
+
+ public Variable (Domain domain, Symbol name, Term val)
{
- internal Xex[] args;
- internal Xex[] body;
+ this.domain = domain;
+ this.name = name;
+ this.val = val;
+ }
- public void SetArgs (XmlNode node, int nargs, Domain domain)
- {
- args = new Xex[nargs];
- node = node.FirstChild;
- for (int i = 0; i < nargs; node = node.NextSibling)
- if (node.Name != Noptional && node.Name != Nrest)
- args[i++] = new Xex (node, domain);
- }
+ public Term Value { get { return val; } }
- public void SetBody (XmlNode node, Domain domain)
- {
- XmlNodeList nlist = node.ChildNodes;
+ public virtual Term SetValue (Term val) { this.val = val; return val; }
- body = new Xex[nlist.Count];
- for (int i = 0; i < nlist.Count; i++)
- body[i] = new Xex (nlist[i], domain);
- }
+ public virtual Variable Clone (Domain domain)
+ {
+ return new Variable (domain, name, val);
}
- public readonly Name name;
- public Builtin builtin;
- public int min_arg, max_arg;
- internal Lambda lambda;
- public bool specialp = false;
+ public virtual void Reset () { val = Zero; }
- public Function (Name name, Builtin builtin,
- int min_arg, int max_arg, bool specialp)
- {
- this.name = name;
- this.builtin = builtin;
- this.min_arg = min_arg;
- this.max_arg = max_arg;
- this.specialp = specialp;
- }
+ public override string ToString () { return name + "(" + val + ")"; }
- public Function (Name name, int min_arg, int max_arg)
+ public abstract class Typed : Variable
{
- this.name = name;
- this.min_arg = min_arg;
- this.max_arg = max_arg;
- }
+ protected string desc;
+ private Term default_val;
- public void Setup (XmlNode node, Domain domain)
- {
- lambda = new Lambda ();
- node = node.FirstChild;
- if (node.Name == Nargs)
+ protected Typed (Domain domain, Symbol name, Term val, string desc)
+ : base (domain, name, val)
{
- lambda.SetArgs (node, max_arg, domain);
- node = node.NextSibling;
+ this.desc = desc;
+ default_val = val;
}
- if (node.Name == Nbody)
- lambda.SetBody (node, domain);
+
+ public override void Reset () { val = default_val; }
+
+ public string Description {
+ get { return desc; }
+ set { desc = value; }
+ }
+
+ public override Term SetValue (Term val)
+ {
+ if (! CheckValue (val))
+ throw new Error (Error.VariableWrongValue,
+ "Wrong value for variable {0}: {1}",
+ name, val);
+ this.val = val;
+ return val;
+ }
+
+ public abstract bool CheckValue (Term val);
}
- public static Name ParseHead (XmlNode node,
- out int min_arg, out int max_arg)
+ public class IntType : Typed
{
- Name name = node.Attributes[Nfname].Value;
- int nargs = 0, noptions = 0, nrest = 0;
- XmlNode n;
-
- for (n = node.FirstChild; n != null; n = n.NextSibling)
+ private int[] range;
+
+ public bool IsSubrange (int[] r)
{
- if (n.Name == Noptional || n.Name == Nrest)
- break;
- nargs++;
+ if (range == null)
+ return true;
+ for (int i = 0; i < r.Length; i += 2)
+ {
+ int j;
+ for (j = 0; j < range.Length; j += 2)
+ if (range[j] <= r[i] && range[j + 1] >= r[i + 1])
+ break;
+ if (j >= range.Length)
+ return false;
+ }
+ return true;
+ }
+
+ public IntType (Domain domain, Symbol name, int n, string desc,
+ int[] range)
+ : base (domain, name, new Term (n), desc)
+ {
+ if (range != null && range.Length % 2 == 1)
+ throw new Error (Error.VariableWrongRange,
+ "Range length for {0} not even", name);
+ this.range = range;
+ CheckValue (val);
}
- if (n != null && n.Name == Noptional)
- for (n = n.NextSibling; n != null; n = n.NextSibling)
+
+ public override bool CheckValue (Term term)
+ {
+ if (term.IsInt)
{
- if (n.Name == Nrest)
- break;
- noptions++;
+ 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;
}
- if (n != null && n.Name == Nrest)
- for (n = n.NextSibling; n != null; n = n.NextSibling)
- nrest++;
- min_arg = nargs;
- max_arg = nargs + noptions + nrest;
- if (nrest == 1)
- max_arg = - max_arg;
- return name;
+ return false;
+ }
+
+ public override Variable Clone (Domain domain)
+ {
+ return new IntType (domain, name, val.Intval, desc, range);
+ }
+
+ public int[] Range { get { return range; } set { range = value; } }
}
- public object Call (Xex[] args, Domain domain)
+ public class StrType : Typed
{
- Bindings current = domain.bindings;
- object result = false;
+ private string[] range;
- Console.Write ("calling (" + this);
- try {
- foreach (Xex e in args)
- Console.Write (" " + e);
- Console.Write (") => ");
- if (builtin != null)
- {
- if (! specialp)
- foreach (Xex a in args)
- if (a.Eval (domain) == null)
- throw new Exception (a + ":evaled to null");
- result = builtin (args, domain);
- Console.WriteLine (result);
- return result;
- }
+ public bool IsSubrange (string[] r)
+ {
+ 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;
+ }
+
+ public StrType (Domain domain, Symbol name, Str str, string desc,
+ string[] range)
+ : base (domain, name, new Term (str), desc)
+ {
+ this.range = range;
+ CheckValue (val);
+ }
- int i;
- for (i = 0; i < min_arg; i++)
+ public override bool CheckValue (Term val)
+ {
+ if (val.IsStr)
{
- Xex a = lambda.args[i];
- bool isdirect = a.args == null;
- Name name = isdirect ? (Name) a.val : (Name) a.args[0].val;
- Variable var = new VarMisc (name, null);
-
- domain.variables[name] = var;
- if (isdirect)
- domain.Bind (var, args[i]);
- else
- domain.Bind (var, args[i].Eval (domain));
+ if (range == null)
+ return true;
+ Str str = val.Strval;
+ foreach (string s in range)
+ if (str.Equals (s))
+ return true;
}
- foreach (Xex e in lambda.body)
- result = e.Eval (domain);
- Console.WriteLine (result);
- } finally {
- domain.UnboundTo (current);
+ return false;
}
- return result;
+
+ public override Variable Clone (Domain domain)
+ {
+ return new StrType (domain, name, val.Strval, desc, range);
+ }
+
+ public string[] Range { get { return range; } set { range = value; } }
}
- public override string ToString ()
+ public class SymType : Typed
{
- string str;
+ public Symbol[] range;
- if (builtin != null)
- str = name;
- else
+ public bool IsSubrange (Symbol[] r)
+ {
+ 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;
+ }
+
+ public SymType (Domain domain, Symbol name, Symbol sym, string desc,
+ Symbol[] range)
+ : base (domain, name, new Term (sym), desc)
{
- str = "(" + name;
- foreach (Xex a in lambda.args)
- str += " " + a;
- str += ")";
+ this.range = range;
+ CheckValue (val);
}
- return str;
+
+ public override bool CheckValue (Term val)
+ {
+ if (val.IsSymbol)
+ {
+ if (range == null)
+ return true;
+ Symbol sym = val.Symval;
+ foreach (Symbol n in range)
+ if (sym == n)
+ return true;
+ }
+ return false;
+ }
+
+ public override Variable Clone (Domain domain)
+ {
+ return new SymType (domain, name, val.Symval, desc, range);
+ }
+
+ public Symbol[] Range { get { return range; } set { range = value; } }
}
}
- internal abstract class Variable
+ public abstract class Function
{
- public readonly Name name;
- public readonly Name type;
- internal object val;
-
- public Variable (Name name, Name type, object value)
+ public Symbol name;
+ // True iff the function can be called with vname="VNAME" attribute.
+ internal readonly bool with_var;
+ // Minimum number of positional arguments.
+ internal readonly int min_args;
+ // If non-nengative, maximum number of arguments. If negative,
+ // maxinum number of positional arguments is (-1 - max_args),
+ // and the remaining unlimit number of arguments are given as a
+ // single list.
+ internal readonly int max_args;
+
+ public delegate Term Builtin (Domain domain, Variable vari, Term[] terms);
+
+ public Function () { }
+
+ public Function (Symbol name, bool with_var, int min_args, int max_args)
{
- if (value != null)
- Value = value;
this.name = name;
- this.type = type;
+ this.with_var = with_var;
+ this.min_args = min_args;
+ this.max_args = max_args;
}
- public object Value
+ public abstract Term Call (Domain domain, Variable vari, Term[] args);
+
+ public override string ToString ()
{
- get { return val; }
- set
- {
- if (! ValueP (value))
- throw new Exception ("Invalid value type: " + value);
- val = value;
- }
+ return name;
}
- public abstract bool ValueP (object value);
+ internal class Subroutine : Function
+ {
+ public Builtin builtin;
- public override string ToString () { return name + "=" + val; }
- }
+ public Subroutine (Builtin builtin, Symbol name, bool with_var,
+ int min_args, int max_args)
+ : base (name, with_var, min_args, max_args)
+ {
+ this.builtin = builtin;
+ }
- internal class VarInt : Variable
- {
- public struct Range
- {
- public int from, to;
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ if (args.Length > 0)
+ {
+ 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, args);
+ }
}
- public Range[] ranges;
+ internal class SpecialForm : Function
+ {
+ public Builtin builtin;
+
+ public SpecialForm (Builtin builtin, Symbol name, bool with_var,
+ int min_args, int max_args)
+ : base (name, with_var, min_args, max_args)
+ {
+ this.builtin = builtin;
+ }
- public VarInt (Name name, object value) : base (name, Ninteger, value) { }
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ return builtin (domain, vari, args);
+ }
+ }
- public override bool ValueP (object value)
+ internal class Lambda : Function
{
- int i;
+ private Variable[] args;
+ private Term[] body;
- if (! (value is int))
- return false;
- if (ranges == null)
- return true;
- i = (int) value;
- foreach (Range r in ranges)
- if (i >= r.from && i <= r.to)
- return true;
- return false;
- }
- }
+ public Lambda (Symbol name, int min_args, int max_args, Variable[] args,
+ Term[] body)
+ : base (name, false, min_args, max_args)
+ {
+ this.args = args;
+ this.body = body;
+ }
- internal class VarStr : Variable
- {
- public string[] ranges;
+ public void SetBody (Term[] body)
+ {
+ this.body = body;
+ }
- public VarStr (Name name, object value) : base (name, Nstring, value) { }
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ Bindings current = domain.bindings;
+ Term result = Zero;
+ int limit = max_args >= 0 ? args.Length : args.Length - 1;
- public override bool ValueP (object value)
- {
- string str;
+ try {
+ for (int i = 0; i < limit; i++)
+ {
+ result = args[i].Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ domain.Bind (this.args[i], result);
+ }
+ if (max_args < 0)
+ {
+ List<Term> list = new List<Term> ();
+ list.InsertRange (0, args[limit].Listval);
- if (! (value is string))
- return false;
- if (ranges == null)
- return true;
- str = (string) value;
- foreach (string s in ranges)
- if (s == str)
- return true;
- return false;
+ for (int i = 0; i < list.Count; i++)
+ {
+ result = list[i].Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ list[i] = result;
+ }
+ domain.Bind (this.args[limit], new Term (list));
+ }
+ try {
+ domain.Catch (CatchTag.Return);
+ foreach (Term term in body)
+ {
+ result = term.Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ }
+ } finally {
+ domain.Uncatch ();
+ }
+ } finally {
+ domain.UnboundTo (current);
+ }
+ return result;
+ }
}
- }
- internal class VarBool : Variable
- {
- public VarBool (Name name, object value)
- : base (name, Nboolean, value) { }
-
- public override bool ValueP (object value)
+ internal class Macro : Function
{
- if (! (value is bool))
- return false;
- return true;
- }
- }
+ private Variable[] args;
+ private Term[] body;
- internal class VarMisc : Variable
- {
- public VarMisc (Name name, object value) : base (name, Nobject, value) { }
+ public Macro (Symbol name, int min_args, int max_args, Variable[] args,
+ Term[] body)
+ : base (name, false, min_args, max_args)
+ {
+ this.args = args;
+ this.body = body;
+ }
- public override bool ValueP (object value)
- {
- return true;
+ public void SetBody (Term[] body)
+ {
+ this.body = body;
+ }
+
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ Bindings current = domain.bindings;
+ Term result = Zero;
+
+ try {
+ for (int i = 0; i < args.Length; i++)
+ domain.Bind (this.args[i], args[i]);
+ try {
+ domain.Catch (CatchTag.Return);
+ foreach (Term term in body)
+ {
+ result = term.Eval (domain);
+ if (domain.Thrown ())
+ break;
+ }
+ } finally {
+ domain.Uncatch ();
+ }
+ } finally {
+ domain.UnboundTo (current);
+ }
+ return result;
+ }
}
}
internal class Bindings
{
private Variable vari;
- private object old_value;
+ private Term old_value;
private Bindings next;
- private Bindings (Variable vari, object value)
+ private Bindings (Variable vari)
{
this.vari = vari;
- old_value = value;
+ old_value = vari.Value;
}
- public static Bindings Bind (Bindings bindings,
- Variable vari, object value)
+ public static Bindings Bind (Bindings bindings, Variable vari, Term val)
{
- Bindings b = new Bindings (vari, vari.val);
+ Bindings b = new Bindings (vari);
- b.vari.Value = value;
+ b.vari.SetValue (val);
b.next = bindings;
return b;
}
internal Bindings UnboundTo (Bindings boundary)
{
for (Bindings b = this; b != boundary; b = b.next)
- vari.val = b.old_value;
+ b.vari.SetValue (b.old_value);
return boundary;
}
{
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
+ internal struct CatchTag
{
- Name tag;
- public object value;
+ private Term tag;
+ public Term Tag { get { return tag; } }
- public ThrowException (Name tag, object value) : base ()
- {
- this.tag = tag;
- this.value = value;
- }
+ // Normal symbolic catch-tag.
+ public CatchTag (Symbol sym) { tag = new Term (sym); }
+ // Special catch-tag for return and break.
+ private CatchTag (int i) { tag = new Term (i); }
+
+ public static CatchTag Return = new CatchTag (0);
+ public static CatchTag Break = new CatchTag (1);
}
-#endif
public class Domain
{
+ public Symbol name;
public object context;
-
- internal Dictionary<Name, Function> functions;
- internal Dictionary<Name, Variable> variables;
+ public int depth = 0;
+ private Stack<Term> call_stack = new Stack<Term> ();
+
+ 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 (Symbol name, Domain parent, object context) : this (name)
{
+ termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
+ functions = new Dictionary<Symbol, Function> (parent.functions);
+ variables = new Dictionary<Symbol, Variable> (parent.variables);
+ this.context = context;
}
- public Domain (Domain parent, object context)
+ public int CallStackCount { get { return call_stack.Count; } }
+
+ public void CallStackPush (Term term) { call_stack.Push (term); }
+
+ public void CallStackPop () { call_stack.Pop (); }
+
+ public void CallStackPop (int count)
{
- functions = new Dictionary<Name, Function> (parent.functions);
- variables = new Dictionary<Name, Variable> (parent.variables);
- this.context = context;
+ while (count < call_stack.Count)
+ call_stack.Pop ();
}
- internal void Bind (Variable vari, object value)
+ public Term[] CallStack { get { return call_stack.ToArray (); } }
+
+ internal void Bind (Variable vari, Term value)
{
bindings = Bindings.Bind (bindings, vari, value);
}
bindings = bindings.UnboundTo (boundary);
}
- public void Defun (Name name, Builtin builtin, int min_arg, int max_arg)
+ internal void Catch (CatchTag tag)
{
- Defun (name, builtin, min_arg, max_arg, false);
+ catch_stack.Push (tag);
+ catch_count++;
}
- public void Defun (Name name, Builtin builtin,
- int min_arg, int max_arg, bool specialp)
+ internal void Uncatch ()
{
- Function func;
+ catch_stack.Pop ();
+ if (catch_count > catch_stack.Count)
+ catch_count--;
+ }
- 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
+ public bool Thrown () { return catch_count < catch_stack.Count; }
+
+ public bool Thrown (out bool caught)
+ {
+ if (catch_count < catch_stack.Count)
{
- functions[name]
- = new Function (name, builtin, min_arg, max_arg, specialp);
+ caught = catch_count == catch_stack.Count - 1;
+ return true;
}
+ caught = false;
+ return false;
}
- internal Function RegisterFunction (XmlNode node)
+ internal void ThrowReturn ()
{
- int min_arg, max_arg;
- Name name = Function.ParseHead (node, out min_arg, out max_arg);
- Function func = new Function (name, min_arg, max_arg);
-
- functions[name] = func;
- return func;
+ foreach (CatchTag elt in catch_stack)
+ {
+ catch_count--;
+ if (elt.Tag == CatchTag.Return.Tag)
+ break;
+ }
}
- internal Function Defun (XmlNode node)
+ internal void ThrowBreak ()
{
- Name name = node.Attributes[Nfname].Value;
- Function func;
-
- if (! functions.TryGetValue (name, out func))
- func = RegisterFunction (node);
- func.Setup (node, this);
- return func;
+ if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
+ throw new Error (Error.NoLoopToBreak,
+ "No surrounding loop to break");
+ catch_count--;
}
- public void Defvar (Name name, XmlNode node)
+ internal void ThrowSymbol (Term tag)
{
- Variable vari;
-
- if (node.Name == Ndescription)
- node = node.NextSibling;
- if (node.Name == Nconst)
+ int i = catch_count;
+ foreach (CatchTag elt in catch_stack)
{
- Name type = (Name) node.Attributes[Ntype].Value;
- string val = node.Value;
- XmlNodeList range_list = null;
- int nranges = 0;
-
- node = node.NextSibling;
- if (node.Name == Npossible_value)
- {
- 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 == Nconst)
- {
- int num = parse_integer (n.Value);
- vi.ranges[i].from = vi.ranges[i].to = num;
- }
- else // range_list[i].Name == "range"
- {
- vi.ranges[i].from =
- parse_integer (n.FirstChild.Value);
- vi.ranges[i].to =
- parse_integer (n.LastChild.Value);
- }
- }
- }
- 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)
+ i--;
+ if (elt.Tag.Matches (tag))
{
- vari = new VarBool (name, val == "true");
+ catch_count = i;
+ return;
}
- else
- throw new Exception ("Unknown type: " + type);
}
- else
- vari = new VarMisc (name, null);
- variables[name] = vari;
+ throw new Error (Error.UncaughtThrow,
+ "No corresponding catch: {0}", tag);
}
- internal Function GetFunc (Name name)
+ public void DefType (Type type)
{
- Function func;
-
- if (! functions.TryGetValue (name, out func))
- throw new Exception ("Unknown function: " + name);
- return func;
+ if (! type.IsSubclassOf (typeof (TermValue)))
+ throw new Error (Error.TermTypeInvalid,
+ "Not a subclass of TermValue: {0}", type);
+ BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
+ FieldInfo finfo = type.GetField ("name", flags);
+ if (finfo == null || finfo.FieldType != typeof (Symbol))
+ throw new Error (Error.TermTypeInvalid,
+ "No \"name\" field of string type: {0}", type);
+ Symbol name = (Symbol) finfo.GetValue (null);
+ if (termtypes.ContainsKey (name))
+ throw new Error (Error.TermTypeInvalid,
+ "Already defined: {0}", name);
+ if (functions.ContainsKey (name))
+ throw new Error (Error.TermTypeInvalid,
+ "Already defined as a function or a macro: {0}",
+ name);
+ Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
+ MethodInfo parser = type.GetMethod ("Parser", types);
+ if (parser == null || parser.ReturnType != typeof (TermValue))
+ throw new Error (Error.TermTypeInvalid,
+ "No \"Parser\" method of correct type: {0}", type);
+ termtypes[name] = parser;
}
- public bool CopyFunc (Domain domain, Name name)
+ private void check_func_head (Symbol name, bool with_var,
+ int min_args, int max_args, bool as_macro)
{
- Function func = GetFunc (name);
+ if (termtypes.ContainsKey (name))
+ throw new Error (Error.FunctionConflict,
+ "Already defined as a term type: {0}", name);
+ Function func;
+ if (functions.TryGetValue (name, out func))
+ {
+ if ((func is Function.Macro) != as_macro)
+ throw new Error (Error.FunctionConflict,
+ "Already defined as a {0}: {1}",
+ as_macro ? "function" : "macro", name);
+ if (func.with_var != with_var
+ || func.min_args != min_args
+ || func.max_args != max_args)
+ throw new Error (Error.FunctionConflict,
+ "Conflicting arguments: {0}", name);
+ }
+ }
- domain.functions[name] = func;
- return true;
+ public void DefSubr (Function.Builtin builtin, Symbol name,
+ bool with_var, int min_args, int max_args)
+ {
+ check_func_head (name, with_var, min_args, max_args, false);
+ functions[name] = new Function.Subroutine (builtin, name, with_var,
+ min_args, max_args);
}
- public void CopyFunc (Domain domain)
+ public void DefSpecial (Function.Builtin builtin, Symbol name,
+ bool with_var, int min_args, int max_args)
{
- foreach (KeyValuePair<Name, Function> kv in functions)
- domain.functions[kv.Key] = kv.Value;
+ check_func_head (name, with_var, min_args, max_args, false);
+ functions[name] = new Function.SpecialForm (builtin, name, with_var,
+ min_args, max_args);
}
- internal Variable GetVar (Name name)
+ public void Defun (Symbol name, int min_args, int max_args,
+ Variable[] args, Term[] body)
{
- Variable vari;
+ check_func_head (name, false, min_args, max_args, false);
+ functions[name] = new Function.Lambda (name, min_args, max_args,
+ args, body);
+ }
- if (! variables.TryGetValue (name, out vari))
- variables[name] = vari = new VarMisc (name, null);
- return vari;
+ public void Defun (Function func)
+ {
+ functions[func.name] = func;
}
- internal Variable GetVar (Xex e)
+ public void Defmacro (Symbol name, int min_args, int max_args,
+ Variable[] args, Term[] body)
{
- if (! (e.val is Name))
- throw new Exception ("Not a symbol" + e.val);
- return GetVar ((Name) e.val);
+ check_func_head (name, false, min_args, max_args, true);
+ functions[name] = new Function.Macro (name, min_args, max_args,
+ args, body);
}
- public override string ToString ()
+ public void DefAlias (Symbol alias, Symbol fname)
{
- string str = "<(functions";
- foreach (KeyValuePair<Name, Function> kv in functions)
- str += " " + kv.Key;
- str += ") (variabls";
- foreach (KeyValuePair<Name, Variable> kv in variables)
- str += " " + kv.Key;
- str += ")";
- if (bindings != null)
- str += " " + bindings;
- if (context != null)
- str += " (" + context + ")";
- str += ">";
- return str;
+ Function func;
+ if (termtypes.ContainsKey (alias))
+ throw new Error (Error.FunctionConflict,
+ "Alread defined as a term type: {0}", alias);
+ if (functions.ContainsKey (alias))
+ throw new Error (Error.FunctionConflict,
+ "Alread defined as a function: {0}", alias);
+ if (! functions.TryGetValue (fname, out func))
+ throw new Error (Error.UnknownFunction, fname);
+ functions[alias] = func;
}
- }
- public delegate object Builtin (Xex[] args, Domain domain);
-
- private static Domain basic = new Domain ();
-
- internal static Function Fprogn;
-
- 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", add, 2, -1, false);
- basic.Defun ("+", add, 2, -1, false);
- basic.Defun ("mul", mul, 2, -1, false);
- basic.Defun ("*", mul, 2, -1, false);
- basic.Defun ("sub", sub, 1, -1, false);
- basic.Defun ("-", sub, 1, -1, false);
- basic.Defun ("div", div, 2, -1, false);
- basic.Defun ("/", div, 2, -1, false);
- basic.Defun ("mod", mod, 2, 2, false);
- basic.Defun ("%", mod, 2, 2, false);
- basic.Defun ("logior", logior, 2, -1, false);
- basic.Defun ("|", logior, 2, -1, false);
- basic.Defun ("logand", logand, 2, -1, false);
- basic.Defun ("&", logand, 2, -1, false);
- basic.Defun ("add-set", add_set, 2, -1, true);
- basic.Defun ("+=", add_set, 2, -1, true);
- basic.Defun ("mul-set", mul_set, 2, -1, true);
- basic.Defun ("*=", mul_set, 2, -1, true);
- basic.Defun ("sub-set", sub_set, 2, -1, true);
- basic.Defun ("-=", sub_set, 2, -1, true);
- basic.Defun ("div-set", div_set, 2, -1, true);
- basic.Defun ("/=", div_set, 2, -1, true);
- basic.Defun ("mod-set", mod_set, 2, 2, true);
- basic.Defun ("%=", mod_set, 2, 2, true);
- basic.Defun ("logior-set", logior_set, 2, -1, true);
- basic.Defun ("|=", logior_set, 2, -1, true);
- basic.Defun ("logand-set", logand_set, 2, -1, true);
- basic.Defun ("&=", logand_set, 2, -1, true);
- basic.Defun ("lsh", lsh, 2, 2, false);
- basic.Defun ("<<", lsh, 2, 2, false);
- basic.Defun ("rsh", rsh, 2, 2, false);
- basic.Defun (">>", rsh, 2, 2, false);
- basic.Defun ("lsh-set", lsh_set, 2, 2, true);
- basic.Defun ("<<=", lsh_set, 2, 2, true);
- basic.Defun ("rsh-set", rsh_set, 2, 2, true);
- basic.Defun (">>=", rsh_set, 2, 2, true);
- basic.Defun ("eq", eq, 2, -1, false);
- basic.Defun ("==", eq, 2, -1, false);
- basic.Defun ("noteq", noteq, 2, 2, false);
- basic.Defun ("!=", noteq, 2, 2, false);
- basic.Defun ("lt", less_than, 2, -1, false);
- basic.Defun ("<", less_than, 2, -1, false);
- basic.Defun ("le", less_eq, 2, -1, false);
- basic.Defun ("<=", less_eq, 2, -1, false);
- basic.Defun ("gt", greater_than, 2, -1, false);
- basic.Defun (">", greater_than, 2, -1, false);
- basic.Defun ("ge", greater_eq, 2, -1, false);
- basic.Defun (">=", greater_eq, 2, -1, false);
- basic.Defun ("eval", eval_clause, 1, 1, true);
- basic.Defun ("progn", progn_clause, 0, -1, true);
- basic.Defun ("expr", progn_clause, 0, -1, true);
- basic.Defun ("if", if_clause, 2, -1, true);
- basic.Defun ("when", when_clause, 1, -1, true);
- basic.Defun ("while", while_clause, 1, -1, true);
-
- Fprogn = basic.GetFunc (Nprogn);
- }
-
- private static bool is_true (object val)
- {
- return (val is bool ? (bool) val
- : val is int ? (int) val == 0
- : true);
- }
-
- private static object set_value (Xex[] args, Domain domain)
- {
- Variable vari = domain.GetVar (args[0]);
-
- vari.Value = args[1].val;
- return vari.val;
- }
-
- private static object and (Xex[] args, Domain domain)
- {
- foreach (Xex arg in args)
- if (! is_true (arg.val))
- return false;
- return true;
- }
+ public Variable Defvar (Variable vari)
+ {
+ vari = vari.Clone (this);
+ variables[vari.name] = vari;
+ return vari;
+ }
- private static object or (Xex[] args, Domain domain)
- {
- foreach (Xex arg in args)
- if (is_true (arg.val))
- return true;
- return false;
- }
+ internal Variable Defvar (Symbol name)
+ {
+ Variable vari;
- private static object not (Xex[] args, Domain domain)
- {
- return ! is_true (args[0].val);
- }
+ if (variables.TryGetValue (name, out vari))
+ {
+ Variable.Typed typed = vari as Variable.Typed;
+ if (typed != null)
+ throw new Error (Error.VariableTypeConflict,
+ "Not a non-typed variable: {0}", name);
+ }
+ else
+ {
+ vari = new Variable (this, name, Zero);
+ variables[name] = vari;
+ }
+ return vari;
+ }
- private static object add (Xex[] args, Domain domain)
- {
- int n = 0;
- foreach (Xex e in args)
- n += (int) e.val;
- return n;
- }
+ public Variable DefvarInt (Symbol name, int n, string desc, int[] range)
+ {
+ Variable vari;
- private static object mul (Xex[] args, Domain domain)
- {
- int n = 1;
- foreach (Xex e in args)
- n *= (int) e.val;
- return n;
- }
+ if (variables.TryGetValue (name, out vari))
+ {
+ Variable.IntType intvari = vari as Variable.IntType;
+ if (intvari == null)
+ throw new Error (Error.VariableTypeConflict,
+ "Not an integer variable: {0}", name);
+ if (range != null)
+ {
+ if (! intvari.IsSubrange (range))
+ throw new Error (Error.VariableRangeConflict,
+ "Conflicting variable range: {0}", name);
+ intvari.Range = range;;
+ }
+ if (desc != null)
+ intvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.IntType (this, name, n, desc, range);
+ variables[name] = vari;
+ }
+ return vari;
+ }
- 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;
- }
+ public Variable DefvarStr (Symbol name, string str, string desc,
+ string[] range)
+ {
+ Variable vari;
- private static object div (Xex[] args, Domain domain)
- {
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i].val;
- return n;
- }
+ if (variables.TryGetValue (name, out vari))
+ {
+ Variable.StrType strvari = vari as Variable.StrType;
+ if (strvari == null)
+ throw new Error (Error.VariableTypeConflict,
+ "Not a string variable: {0}", name);
+ if (range != null)
+ {
+ if (! strvari.IsSubrange (range))
+ throw new Error (Error.VariableRangeConflict,
+ "Conflicting variable range: {0}", name);
+ strvari.Range = range;
+ }
+ if (desc != null)
+ strvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.StrType (this, name, new Str (str), desc,
+ range);
+ variables[name] = vari;
+ }
+ return vari;
+ }
- private static object mod (Xex[] args, Domain domain)
- {
- return ((int) args[0].val % (int) args[1].val);
+ public Variable DefvarSym (Symbol name, Symbol sym, string desc,
+ Symbol[] range)
+ {
+ Variable vari;
+
+ if (variables.TryGetValue (name, out vari))
+ {
+ Variable.SymType symvari = vari as Variable.SymType;
+ if (symvari == null)
+ throw new Error (Error.VariableTypeConflict,
+ "Not a symbol variable: {0}", name);
+ if (range != null)
+ {
+ if (! symvari.IsSubrange (range))
+ throw new Error (Error.VariableRangeConflict,
+ "Conflicting variable range: {0}", name);
+ symvari.Range = range;
+ }
+ if (desc != null)
+ symvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.SymType (this, name, sym, desc, range);
+ variables[name] = vari;
+ }
+ return vari;
+ }
+
+ internal Function GetFunc (Symbol name)
+ {
+ Function func;
+ if (! functions.TryGetValue (name, out func))
+ throw new Error (Error.UnknownFunction,
+ "Unknown function: {0}", name);
+ return func;
+ }
+
+ public bool CopyFunc (Domain domain, Symbol name)
+ {
+ Function func = GetFunc (name);
+
+ domain.functions[name] = func;
+ return true;
+ }
+
+ public void CopyFunc (Domain domain)
+ {
+ foreach (KeyValuePair<Symbol, Function> kv in functions)
+ domain.functions[kv.Key] = kv.Value;
+ }
+
+ public Variable GetVarCreate (Symbol name)
+ {
+ Variable vari;
+
+ if (! variables.TryGetValue (name, out vari))
+ variables[name] = vari = new Variable (this, name, Zero);
+ return vari;
+ }
+
+ public Variable GetVar (Symbol name)
+ {
+ Variable vari;
+
+ if (! variables.TryGetValue (name, out vari))
+ return null;
+ return vari;
+ }
+
+ public override string ToString ()
+ {
+ string str = "<(functions";
+ foreach (KeyValuePair<Symbol, Function> kv in functions)
+ str += " " + kv.Key;
+ str += ") (variabls";
+ foreach (KeyValuePair<Symbol, Variable> kv in variables)
+ str += " " + kv.Value;
+ str += ")";
+ if (bindings != null)
+ str += " " + bindings;
+ if (context != null)
+ str += " (" + context + ")";
+ str += ">";
+ return str;
+ }
+
+ internal void TraceWrite (string fmt, params string[] arg)
+ {
+ if (trace_depth > depth)
+ {
+ 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.SetValue (kv.Value);
+ }
}
- private static object logior (Xex[] args, Domain domain)
+ private static Domain basic = new Domain ("basic");
+
+ static Xexpression ()
{
- int n = 0;
- foreach (Xex e in args)
- n |= (int) e.val;
- return n;
+ basic.DefType (typeof (Varref));
+ basic.DefType (typeof (Funcall));
+ basic.DefType (typeof (ErrorTerm));
+
+ basic.DefSubr (Fset, "set", true, 1, 1);
+ basic.DefAlias ("=", "set");
+ basic.DefSubr (Fnot, "not", false, 1, 1);
+ basic.DefAlias ("!", "not");
+ basic.DefSubr (Fadd, "add", true, 1, -1);
+ basic.DefAlias ("+", "add");
+ basic.DefSubr (Fmul, "mul", true, 1, -1);
+ basic.DefAlias ("*", "mul");
+ basic.DefSubr (Fsub, "sub", true, 1, -1);
+ basic.DefAlias ("-", "sub");
+ basic.DefSubr (Fdiv, "div", true, 1, -1);
+ basic.DefAlias ("/", "div");
+ basic.DefSubr (Fmod, "mod", true, 1, 2);
+ basic.DefAlias ("%", "mod");
+ basic.DefSubr (Flogior, "logior", true, 1, -1);
+ basic.DefAlias ("|", "logior");
+ basic.DefSubr (Flogand, "logand", true, 1, -1);
+ basic.DefAlias ("&", "logand");
+ basic.DefSubr (Flsh, "lsh", true, 1, 2);
+ basic.DefAlias ("<<", "lsh");
+ basic.DefSubr (Frsh, "rsh", true, 1, 2);
+ basic.DefAlias (">>", "rsh");
+ basic.DefSubr (Feq, "eq", false, 2, -1);
+ basic.DefAlias ("==", "eq");
+ basic.DefSubr (Fnoteq, "noteq", false, 2, 2);
+ basic.DefAlias ("!=", "noteq");
+ basic.DefSubr (Flt, "lt", false, 2, -1);
+ basic.DefAlias ("<", "lt");
+ basic.DefSubr (Fle, "le", false, 2, -1);
+ basic.DefAlias ("<=", "le");
+ basic.DefSubr (Fgt, "gt", false, 2, -1);
+ basic.DefAlias (">", "gt");
+ basic.DefSubr (Fge, "ge", false, 2, -1);
+ basic.DefAlias (">=", "ge");
+
+ basic.DefSubr (Fappend, "append", true, 0, -1);
+ basic.DefSubr (Fconcat, "concat", true, 0, -1);
+ basic.DefSubr (Fnth, "nth", false, 2, 2);
+ basic.DefSubr (Fcopy, "copy", false, 1, 1);
+ basic.DefSubr (Fins, "ins", true, 2, 2);
+ basic.DefSubr (Fdel, "del", true, 2, 2);
+ basic.DefSubr (Feval, "eval", false, 1, 1);
+ basic.DefSubr (Fbreak, "break", false, 0, 1);
+ basic.DefSubr (Freturn, "return", false, 0, 1);
+ basic.DefSubr (Fthrow, "throw", false, 1, 2);
+
+ basic.DefSpecial (Fand, "and", false, 1, -1);
+ basic.DefAlias ("&&", "and");
+ basic.DefSpecial (For, "or", false, 1, -1);
+ basic.DefAlias ("||", "or");
+ basic.DefSpecial (Fprogn, "progn", false, 0, -1);
+ basic.DefAlias ("expr", "progn");
+ basic.DefSpecial (Fif, "if", false, 2, 3);
+ basic.DefSpecial (Fwhen, "when", false, 1, -1);
+ basic.DefSpecial (Floop, "loop", false, 1, -1);
+ basic.DefSpecial (Fwhile, "while", false, 1, -1);
+ basic.DefSpecial (Fcond, "cond", false, 1, -1);
+ basic.DefSpecial (Fforeach, "foreach", true, 2, -1);
+ basic.DefSpecial (Fquote, "quote", false, 1, 1);
+ basic.DefSpecial (Ftype, "type", false, 1, 1);
+ basic.DefSpecial (Fcatch, "catch", true, 2, -1);
}
- private static object logand (Xex[] args, Domain domain)
+ private static Term Fset (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- n &= (int) args[i].val;
- return n;
+ if (vari == null)
+ throw new Error (Error.NoVariableName, "No variable name to set");
+ vari.SetValue (args[0]);
+ return args[0];
}
- private static object add_set (Xex[] args, Domain domain)
+ private static Term Fnot (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
-
- for (int i = 1; i < args.Length; i++)
- n += (int) args[i].val;
- vari.val = n;
- return n;
+ return args[0].IsTrue ? Zero : One;
}
- private static object mul_set (Xex[] args, Domain domain)
+ static Term maybe_set_intvar (Variable vari, int n)
{
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
-
- for (int i = 1; i < args.Length; i++)
- n *= (int) args[i].val;
- vari.val = n;
- return n;
+ Term term = new Term (n);
+ if (vari != null)
+ vari.SetValue (term);
+ return term;
}
- private static object sub_set (Xex[] args, Domain domain)
+
+ private static Term Fadd (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
+ int n = vari == null ? 0 : vari.Value.Intval;
- for (int i = 1; i < args.Length; i++)
- n -= (int) args[i].val;
- vari.val = n;
- return n;
+ foreach (Term arg in args)
+ n += arg.Intval;
+ return maybe_set_intvar (vari, n);
}
- private static object div_set (Xex[] args, Domain domain)
+ private static Term Fmul (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
-
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i].val;
- vari.val = n;
- return n;
+ int n = vari == null ? 1 : vari.Value.Intval;
+ foreach (Term arg in args)
+ n *= arg.Intval;
+ return maybe_set_intvar (vari, n);
}
- private static object mod_set (Xex[] args, Domain domain)
+ private static Term Fsub (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
+ int n, i;
- for (int i = 1; i < args.Length; i++)
- n %= (int) args[i].val;
- vari.val = n;
- return n;
+ if (vari == null)
+ {
+ n = args[0].Intval;
+ i = 1;
+ }
+ else
+ {
+ n = vari.Value.Intval;
+ i = 0;
+ }
+ while (i < args.Length)
+ n -= args[i++].Intval;
+ return maybe_set_intvar (vari, n);
}
- private static object logior_set (Xex[] args, Domain domain)
+ private static Term Fdiv (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
+ int n, i;
- for (int i = 1; i < args.Length; i++)
- n |= (int) args[i].val;
- vari.val = n;
- return n;
+ if (vari == null)
+ {
+ n = args[0].Intval;
+ i = 1;
+ }
+ else
+ {
+ n = vari.Value.Intval;
+ i = 0;
+ }
+ while (i < args.Length)
+ n /= args[i++].Intval;
+ return maybe_set_intvar (vari, n);
}
- private static object logand_set (Xex[] args, Domain domain)
+ private static Term Fmod (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
-
- for (int i = 1; i < args.Length; i++)
- n &= (int) args[i].val;
- vari.val = n;
- return n;
+ return maybe_set_intvar (vari, args[0].Intval % args[1].Intval);
}
- private static object lsh (Xex[] args, Domain domain)
+ private static Term Flogior (Domain domain, Variable vari, Term[] args)
{
- return (int) args[0].val << (int) args[1].val;
+ int n = vari == null ? 0 : vari.Value.Intval;
+ foreach (Term arg in args)
+ n |= arg.Intval;
+ return maybe_set_intvar (vari, n);
}
- private static object lsh_set (Xex[] args, Domain domain)
+ private static Term Flogand (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
+ int n, i;
- n <<= (int) args[1].val;
- vari.val = n;
- return n;
+ if (vari == null)
+ {
+ n = args[0].Intval;
+ i = 1;
+ }
+ else
+ {
+ n = vari.Value.Intval;
+ i = 0;
+ }
+ while (i < args.Length)
+ n &= args[i++].Intval;
+ return maybe_set_intvar (vari, n);
}
- private static object rsh (Xex[] args, Domain domain)
+ private static Term Flsh (Domain domain, Variable vari, Term[] args)
{
- return (int) args[0].val >> (int) args[1].val;
+ return maybe_set_intvar (vari, args[0].Intval << args[1].Intval);
}
- private static object rsh_set (Xex[] args, Domain domain)
+ private static Term Frsh (Domain domain, Variable vari, Term[] args)
{
- Variable vari = domain.GetVar (args[0]);
- int n = (int) vari.val;
-
- n >>= (int) args[1].val;
- vari.val = n;
- return n;
+ return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval);
}
- private static object eq (Xex[] args, Domain domain)
+ private static Term Feq (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0].val;
+ Term o = args[0];
- for (int i = 1; i < args.Length; i++)
- if (n != (int) args[i].val)
- return false;
- return true;
+ if (o.objval == null)
+ {
+ for (int i = 1; i < args.Length; i++)
+ if (args[i].objval != null || args[i].intval != o.intval)
+ return Zero;
+ }
+ else
+ {
+ for (int i = 1; i < args.Length; i++)
+ if (o.objval.Equals (args[i].objval))
+ return Zero;
+ }
+ return One;
}
- private static object noteq (Xex[] args, Domain domain)
+ private static Term Fnoteq (Domain domain, Variable vari, Term[] args)
{
- return ((int) args[0].val != (int) args[1].val);
+ return Feq (domain, vari, args);
}
- private static object less_than (Xex[] args, Domain domain)
+ private static Term Flt (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0].val;
+ int n = args[0].Intval;
for (int i = 1; i < args.Length; i++)
{
- int n1 = (int) args[i].val;
+ int n1 = args[i].Intval;
if (n >= n1)
- return false;
+ return Zero;
n = n1;
}
- return true;
+ return One;
}
- private static object less_eq (Xex[] args, Domain domain)
+ private static Term Fle (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0].val;
+ int n = args[0].Intval;
for (int i = 1; i < args.Length; i++)
{
- int n1 = (int) args[i].val;
+ int n1 = args[i].Intval;
if (n > n1)
- return false;
+ return Zero;
n = n1;
}
- return true;
+ return One;
}
- private static object greater_than (Xex[] args, Domain domain)
+ private static Term Fgt (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0].val;
+ int n = args[0].Intval;
for (int i = 1; i < args.Length; i++)
{
- int n1 = (int) args[i].val;
+ int n1 = args[i].Intval;
if (n <= n1)
- return false;
+ return Zero;
n = n1;
}
- return true;
+ return One;
}
- private static object greater_eq (Xex[] args, Domain domain)
+ private static Term Fge (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0].val;
+ int n = args[0].Intval;
for (int i = 1; i < args.Length; i++)
{
- int n1 = (int) args[i].val;
+ int n1 = args[i].Intval;
if (n < n1)
- return false;
+ return Zero;
n = n1;
}
- return true;
+ return One;
}
- private static object eval_clause (Xex[] args, Domain domain)
+ private static Term Fappend (Domain domain, Variable vari, Term[] args)
{
- return args[0].Eval (domain);
- }
+ List<Term> list;
- private static object progn_clause (Xex[] args, Domain domain)
- {
- object result = true;
+ if (vari == null)
+ list = new List<Term> ();
+ else
+ list = vari.Value.Listval;
- foreach (Xex e in args)
- result = e.Eval (domain);
- return result;
+ foreach (Term arg in args)
+ {
+ if (arg.IsList)
+ list.AddRange ((List<Term>) arg.objval);
+ else
+ list.Add (arg);
+ }
+ if (vari == null)
+ {
+ Term result;
+ result.intval = 0;
+ result.objval = list;
+ return result;
+ }
+ return vari.Value;
}
- private static object if_clause (Xex[] args, Domain domain)
+ private static Term Fconcat (Domain domain, Variable vari, Term[] args)
{
- object result;
+ Str str = vari == null ? new Str ("") : vari.Value.Strval;
- if (is_true (args[0].Eval (domain)))
- result = args[1].Eval (domain);
- else
+ foreach (Term arg in args)
{
- result = false;
- for (int i = 2; i < args.Length; i++)
- result = args[i].Eval (domain);
+ if (arg.IsStr)
+ str.Insert (-1, arg.Strval);
+ else if (arg.IsList)
+ foreach (Term term in arg.Listval)
+ str.Insert (-1, (char) term.Intval);
+ else
+ str.Insert (-1, (char) arg.Intval);
}
- return result;
+ return vari == null ? new Term (str) : vari.Value;
}
- private static object when_clause (Xex[] args, Domain domain)
+ private static Term Fnth (Domain domain, Variable vari, Term[] args)
{
- if (! is_true (args[0].Eval (domain)))
- return false;
-
- object result = true;
- for (int i = 1; i < args.Length; i++)
- result = args[i].Eval (domain);
- return result;
+ if (args[1].IsStr)
+ return new Term (args[1].Strval.Nth (args[0].Intval));
+ if (args[1].IsList)
+ return args[1].Listval[args[0].Intval];
+ throw new Error (Error.WrongType,
+ "Not a string nor a list: {0}", args[1]);
}
- private static object while_clause (Xex[] args, Domain domain)
+ private static Term Fcopy (Domain domain, Variable vari, Term[] args)
{
- while (is_true (args[0].Eval (domain)))
- for (int i = 1; i < args.Length; i++)
- args[i].Eval (domain);
- return false;
+ return args[0].Clone ();
}
- // 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 () { }
-
- private Xex (object val)
+ private static Term Fins (Domain domain, Variable vari, Term[] args)
{
- this.val = val;
+ if (vari == null)
+ throw new Error (Error.NoVariableName, "No variable name to set");
+ if (vari.Value.IsStr)
+ vari.Value.Strval.Insert (args[0].Intval, args[1].Strval);
+ else if (vari.Value.IsList)
+ vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval);
+ else
+ throw new Error (Error.WrongType, "Not a string nor a list: {0}",
+ vari.Value);
+ return vari.Value;
}
- internal static int parse_integer (string str)
+ private static Term Fdel (Domain domain, Variable vari, Term[] args)
{
- int len = str.Length;
- bool negative = false;
-
- if (len <= 1)
- return (len == 0 ? 0 : str[0] - '0');
-
- int c = str[0];
- int i;
+ if (vari == null)
+ throw new Error (Error.NoVariableName, "No variable name to set");
+ if (vari.Value.IsStr)
+ vari.Value.Strval.Delete (args[0].Intval, args[1].Intval);
+ else if (vari.Value.IsList)
+ vari.Value.Listval.RemoveRange (args[0].Intval,
+ args[1].Intval - args[0].Intval);
+ else
+ throw new Error (Error.WrongType, "Not a string nor a list: {0}",
+ vari.Value);
+ return vari.Value;
+ }
- if (c == '0' && str[1] == 'x')
- {
- i = 0;
- for (int idx = 2; idx < len; idx++)
- {
- c = str[idx];
- if (c < '0')
- break;
- else if (c <= '9')
- i = i * 16 + (c - '0');
- else if (c < 'A')
- break;
- else if (c <= 'F')
- i = i * 16 + (c - 'A');
- else if (c < 'a')
- break;
- else if (c <= 'f')
- i = i * 16 + (c - 'a');
- else
- break;
- }
- return i;
- }
- if (c == '-')
- negative = true;
- i = c - '0';
- for (int idx = 1; idx < len; idx++)
+ private static Term Fand (Domain domain, Variable vari, Term[] args)
+ {
+ foreach (Term arg in args)
{
- c = str[idx];
- if (c < '0' || c > '9')
- break;
- i = i * 10 + (c - '0');
+ Term result = arg.Eval (domain);
+ if (domain.Thrown ())
+ result;
+ if (! result.IsTrue)
+ return Zero;
}
- return negative ? - i : i;
+ return One;
}
- private int pre_parse (XmlNodeList nlist, Domain domain)
+ private static Term For (Domain domain, Variable vari, Term[] args)
{
- int len = 0;
- foreach (XmlNode node in nlist)
+ foreach (Term arg in args)
{
- if (node.Name == Ndefun)
- domain.RegisterFunction (node);
- else if (node.Name == Ndefvar)
- domain.Defvar ((Name) node.Attributes[0].Value, node.FirstChild);
- else
- len++;
+ Term result = arg.Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ if (result.IsTrue)
+ return One;
}
- return len;
+ return Zero;
}
- private void post_parse (XmlNodeList nlist, Domain domain)
+ private static Term Feval (Domain domain, Variable vari, Term[] args)
{
- 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 Xex (node, domain);
- }
+ return (args[0].Eval (domain));
}
- private void Setup (XmlNode node, Domain domain)
+ private static Term Fprogn (Domain domain, Variable vari, Term[] args)
{
- Name name = node.Name;
+ Term result = One;
- if (name == Nconst)
- {
- Name type = node.Attributes[Ntype].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)
+ foreach (Term arg in args)
{
- args = new Xex[1];
- args[0] = new Xex ((Name) node.Attributes[0].Value);
+ result = arg.Eval (domain);
+ if (domain.Thrown ())
+ return result;
}
- else
- {
- if (name == Nfuncall)
- name = node.Attributes[0].Value;
- function = domain.GetFunc (name);
+ return result;
+ }
- XmlNodeList nlist = node.ChildNodes;
- int nargs = nlist.Count;
+ private static Term Fif (Domain domain, Variable vari, Term[] args)
+ {
+ Term result = args[0].Eval (domain);
- if (nargs < function.min_arg
- || (function.max_arg >= 0 && nargs > function.max_arg))
- throw new Exception ("Invalid number of arguments to: "
- + name + " " + nargs);
- nargs = pre_parse (nlist, domain);
- args = new Xex[nargs];
- post_parse (nlist, domain);
- }
+ if (domain.Thrown)
+ return result;
+ if (result.IsTrue)
+ return args[1].Eval (domain);
+ if (args.Length == 2)
+ return Zero;
+ return args[2].Eval (domain);
}
- public Xex (string url, Domain domain)
+ private static Term Fwhen (Domain domain, Variable vari, Term[] args)
{
- XmlDocument doc = new XmlDocument (Name.Table);
- XmlNode node;
+ Term result = args[0].Eval (domain);
- using (XmlTextReader reader = new XmlTextReader (url, Name.Table))
+ if (domain.Thrown)
+ return result;
+ if (! result.IsTrue)
+ return Zero;
+ result = One;
+ for (int i = 1; i < args.Length; i++)
{
- 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);
+ result = args[i].Eval (domain);
+ if (domain.Thrown)
+ return result;
}
+ return result;
+ }
+
+ private static Term Freturn (Domain domain, Variable vari, Term[] args)
+ {
+ domain.ThrowReturn ();
+ return args.Length == 0 ? Zero : args[0];
+ }
- Setup (node, domain);
+ private static Term Fbreak (Domain domain, Variable vari, Term[] args)
+ {
+ domain.ThrowBreak ();
+ return args.Length == 0 ? Zero : args[0];
+ }
+
+ private static Term Floop (Domain domain, Variable vari, Term[] args)
+ {
+ Term result = Zero;
+ try {
+ domain.Catch (CatchTag.Break);
+ while (! domain.Thrown ())
+ foreach (Term arg in args)
+ {
+ result = arg.Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ }
+ } finally {
+ domain.Uncatch ();
+ }
+ return result;
}
- // EXPR = SYMBOL | MTEXT | INTEGER | FUNCALL | PROGN
- // FUNCALL = '(' SYMBOL EXPR* ')'
- // PROGN = '(' EXPR * ')'
- public Xex (XmlNode node, Domain domain)
+ private static Term Fwhile (Domain domain, Variable vari, Term[] args)
{
- Setup (node, domain);
+ Term result = Zero;
+ try {
+ domain.Catch (CatchTag.Break);
+ while (! domain.Thrown () && args[0].Eval (domain).IsTrue)
+ for (int i = 1; i < args.Length; i++)
+ {
+ result = args[i].Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ }
+ } finally {
+ domain.Uncatch ();
+ }
+ return result;
}
- public object Eval (Domain domain)
+ private static Term Fcond (Domain domain, Variable vari, Term[] args)
{
- if (function == null)
+ foreach (Term arg in args)
{
- if (args != null)
+ List<Term> list = arg.Listval;
+ Term result = list[0].Eval (domain);
+
+ if (result.IsTrue)
{
- Variable vari = domain.GetVar ((Name) args[0].val);
- val = vari.val;
+ for (int i = 1; i < list.Count; i++)
+ {
+ domain.depth++;
+ result = list[i].Eval (domain);
+ domain.depth--;
+ if (domain.Thrown ())
+ return result;
+ }
+ return result;
}
- return val;
}
- else
- val = function.Call (args, domain);
- return val;
+ return Zero;
+ }
+
+ private static Term Fforeach (Domain domain, Variable vari, Term[] args)
+ {
+ Term result = args[0].Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ List<Term> list = result.Listval;
+ Bindings current = domain.bindings;
+
+ try {
+ domain.Catch (CatchTag.Break);
+ foreach (Term term in list)
+ {
+ domain.Bind (vari, term);
+ try {
+ for (int i = 1; i < args.Length; i++)
+ {
+ result = args[i].Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ }
+ } finally {
+ domain.UnboundTo (current);
+ }
+ }
+ } finally {
+ domain.Uncatch ();
+ }
+ return result;
+ }
+
+ private static Term Fquote (Domain domain, Variable vari, Term[] args)
+ {
+ return args[0];
}
- public override string ToString ()
+ private static Term Ftype (Domain domain, Variable vari, Term[] args)
{
- string str;
+ if (args[0].IsInt)
+ return TermInt;
+ if (args[0].IsStr)
+ return TermStr;
+ if (args[0].IsSymbol)
+ return TermSymbol;
+ if (args[0].IsList)
+ return TermList;
+ return TermTerm;
+ }
+
+ private static Term eval_terms (Domain domain, Term[] terms, int idx,
+ out bool caught)
+ {
+ Term result= Zero;
- if (function != null)
+ caught = false;
+ for (int i = idx; i < terms.Length; i++)
{
- str = "(" + function.name;
- if (args != null)
- foreach (Xex e in args)
- str += " " + e.ToString ();
- str += ")";
+ result = terms[i].Eval (domain);
+ if (domain.Thrown (out caught))
+ return result;
}
- else if (args != null)
+ return result;
+ }
+
+ public static Term Fcatch (Domain domain, Variable vari, Term[] args)
+ {
+ Term result;
+ bool caught = false;
+
+ if (args.Length < 2)
+ throw new Error (Error.WrongArgument,
+ "Too few arguments: {0}", args.Length);
+ ErrorTerm err = args[0].objval as ErrorTerm;
+ if (err != null)
{
- str = (Name) args[0].val;
- }
- else if (val != null)
+ try {
+ result = eval_terms (domain, args, 1, out caught);
+ } catch (System.Exception exception) {
+ Term term;
+
+ Error e = exception as Error;
+ if (e != null)
+ term = new Term (new ErrorTerm (e.Name, e.Message, e.Stack));
+ else
+ term = new Term (new ErrorTerm (exception));
+ if (! args[0].Matches (term))
+ throw exception;
+ if (vari != null)
+ vari.SetValue (term);
+ return One;
+ }
+ }
+ else if (args[0].IsSymbol)
+ {
+ try {
+ domain.Catch (new CatchTag (args[0].Symval));
+ result = eval_terms (domain, args, 1, out caught);
+ if (caught)
+ {
+ if (vari != null)
+ vari.SetValue (result);
+ return One;
+ }
+ return Zero;
+ } finally {
+ domain.Uncatch ();
+ }
+ }
+ throw new Error (Error.WrongArgument,
+ "Not a symbol nor an error: {0}", args[0]);
+ }
+
+ public static Term Fthrow (Domain domain, Variable vari, Term[] args)
+ {
+ if (args[0].IsSymbol)
+ {
+ domain.ThrowSymbol (args[0]);
+ return (args[args.Length - 1]);
+ }
+ if (args[0].IsError)
+ {
+ ErrorTerm err = (ErrorTerm) args[0].objval;
+ throw new Error (err.ErrorName, err.ErrorMessage);
+ }
+ throw new Error (Error.WrongArgument,
+ "Not a symbol nor an error: {0}", args[0]);
+ }
+
+ public abstract class TermValue
+ {
+ public virtual Term Eval (Domain domain) { return new Term (this); }
+ public virtual TermValue Clone () { return this; }
+ public virtual bool IsTrue { get { return true; } }
+ public virtual bool Matches (TermValue other) { return Equals (other); }
+ public override abstract bool Equals (object obj);
+ public override abstract int GetHashCode ();
+ public virtual string ToString (bool detail) { return ToString (); }
+ }
+
+ 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.GetVarCreate (vname);
+ return vari.Value;
+ }
+
+ public static TermValue Parser (Domain domain, XmlNode node)
+ {
+ return new Varref ((Symbol) node.Attributes[Qvname].Value);
+ }
+
+ public override bool Equals (object obj)
+ {
+ Varref varref = obj as Varref;
+ return (varref != null && varref.vari.name == vari.name);
+ }
+
+ public override int GetHashCode ()
+ {
+ return vari.name.GetHashCode ();
+ }
+
+ public override string ToString () { return ToString (true); }
+
+ public override string ToString (bool detail)
+ {
+ return "<varref vname=\"" + vname + "\"/>";
+ }
+ }
+
+ private class Funcall : TermValue
+ {
+ private static Symbol name = "funcall";
+ public static Symbol Name { get { return name; } }
+ private static Term[] null_args = new Term[0];
+
+ internal Function func;
+ internal Variable vari;
+ internal Term[] args;
+
+ public Funcall (Function func, Variable vari, Term[] args)
+ {
+ if (args == null)
+ args = null_args;
+ int nargs = args.Length;
+ if (nargs < func.min_args
+ || (func.max_args >= 0 && nargs > func.max_args))
+ throw new Error (Error.WrongArgument,
+ "Wrong number of arguments to {0}: {1}",
+ func.name, nargs);
+ if (! func.with_var && vari != null)
+ throw new Error (Error.WrongArgument,
+ "Wrong vname attribute to {0}: {1}",
+ func.name, vari.name);
+ 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.GetVarCreate (attr.Value);
+ XmlNodeList nlist = node.ChildNodes;
+ int nargs = nlist.Count;
+ Term[] args = new Term[nargs];
+ for (int i = 0; i < nargs; i++)
+ args[i] = Parse (domain, nlist[i]);
+ return new Funcall (func, vari, args);
+ }
+
+ public override Term Eval (Domain domain)
+ {
+ Term result;
+ domain.TraceWrite (ToString ());
+ try {
+ domain.depth++;
+ result = func.Call (domain, vari, args);
+ } finally {
+ domain.depth--;
+ }
+ domain.TraceWrite ("=> {0}", result.ToString ());
+ return result;
+ }
+
+ public override TermValue Clone ()
+ {
+ return new Funcall (func, vari, args);
+ }
+
+ public override bool Equals (object obj)
+ {
+ Funcall funcall = obj as Funcall;
+ return (obj != null
+ && funcall.func == func
+ && funcall.vari == vari
+ && funcall.args.Length == args.Length);
+ }
+
+ public override int GetHashCode ()
+ {
+ return func.GetHashCode () ^ args.Length;
+ }
+
+ public override string ToString () { return ToString (true); }
+
+ public override string ToString (bool detail)
+ {
+ string str = "<" + func.name;
+ if (vari != null)
+ {
+ str += " vname=\"" + vari.name + "\"";
+ if (detail)
+ str += " val=" + vari.Value.ToString ();
+ }
+ if (args.Length == 0 || ! detail)
+ 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 + ">");
+ }
+ }
+
+ internal class ErrorTerm : TermValue
+ {
+ private static Symbol name = "error";
+ public static Symbol Name { get { return name; } }
+
+ private readonly Symbol ename;
+ public Symbol ErrorName { get { return ename; } }
+ private string message;
+ public string ErrorMessage { get { return message; } }
+ private Term[] stack;
+
+ public ErrorTerm (Symbol ename, string message)
+ : this (ename, message, null) { }
+
+ internal ErrorTerm (Symbol ename, string message, Term[] stack)
+ {
+ this.ename = ename;
+ this.message = message;
+ this.stack = stack;
+ }
+
+ internal ErrorTerm (Exception e)
+ {
+ if (e is ArithmeticException)
+ ename = Error.ArithmeticError;
+ else if (e is IndexOutOfRangeException)
+ ename = Error.IndexOutOfRange;
+ else if (e is InsufficientMemoryException
+ || e is OutOfMemoryException)
+ ename = Error.MemoryError;
+ else
+ ename = Error.UnknownError;
+ message = e.Message;
+ }
+
+ public static TermValue Parser (Domain domain, XmlNode node)
+ {
+ XmlAttribute attr = node.Attributes[Qename];
+ Symbol ename = attr == null ? Qnull : (Symbol) attr.Value;
+ string message = node.InnerText;
+ return new ErrorTerm (ename, message);
+ }
+
+ public Term[] CallStack {
+ get { return stack; }
+ internal set { stack = value; }
+ }
+
+ public override TermValue Clone ()
+ {
+ return new ErrorTerm (ename, message);
+ }
+
+ public override bool Equals (object obj)
+ {
+ ErrorTerm e = obj as ErrorTerm;
+ return (e != null && e.ename == ename && e.message == message
+ && (e.stack == null ? stack == null
+ : (stack != null && e.stack.Length == stack.Length)));
+ }
+
+ public override int GetHashCode ()
+ {
+ return ename.GetHashCode ();
+ }
+
+ public override bool Matches (TermValue term)
+ {
+ ErrorTerm e = term as ErrorTerm;
+ return (e != null && (ename == Qnull || e.ename == ename));
+ }
+
+ public override string ToString () { return ToString (true); }
+
+ public override string ToString (bool detail)
+ {
+ string str = "<error type=\"" + ename + "\">";
+ if (message != null)
+ str += message;
+ if (stack != null)
+ for (int i = 0; i < stack.Length; i++)
+ str += stack[i].ToString (false);
+ return str + "</error>";
+ }
+ }
+
+ public class Str
+ {
+ private string str;
+ private Regex regex;
+
+ public Str (string str) { this.str = str; }
+
+ public Str Clone (Str str) { return new Str (str.str); }
+
+ public bool Equals (string str) { return this.str == str; }
+
+ public bool Equals (Str str) { return this.str == str.str; }
+
+ public bool Matches (Str str)
+ {
+ if (regex != null)
+ regex = new Regex (this.str);
+ return regex.IsMatch (str.str);
+ }
+
+ public int Nth (int index) { return (int) str[index]; }
+
+ public void Insert (int index, Str str)
+ {
+ if (index < 0)
+ this.str = this.str + str.str;
+ else
+ this.str = this.str.Insert (index, str.str);
+ regex = null;
+ }
+
+ public void Insert (int index, char c)
+ {
+ if (index < 0)
+ this.str = this.str + c;
+ else
+ this.str = this.str.Insert (index, new string (c, 1));
+ regex = null;
+ }
+
+ public void Delete (int from, int to)
+ {
+ this.str = this.str.Remove (from, to - from);
+ regex = null;
+ }
+
+ public override string ToString () { return str; }
+ }
+
+ /// <summary> Structure of term object.</summary>
+ public struct Term
+ {
+ internal int intval;
+ internal object objval;
+
+ /// <summary>Create an integer term.</summary>
+ /// <param name='i'>Integer value of the term.</param>
+ /// <returns>An integer term.</returns>
+ /// <remarks>Create an integer term that has the integer value
+ /// specified by <paramref name="i"/>. This is an constant
+ /// term; i.e. the integer value never changes.</remarks>
+ public Term (int i) { intval = i; objval = null; }
+
+ /// <summary>Create a symbol term.</summary>
+ /// <param name='name'>Symbol value of the term.</param>
+ /// <returns>A symbol term.</returns>
+ /// <remarks>Create a symbol term that has the symbol value
+ /// specified by <paramref name="name"/>. This is an constant
+ /// term; i.e. the symbol value never changes. It is evaluated
+ /// to itself.</remarks>
+ public Term (Symbol name) { intval = 0; objval = name; }
+
+ /// <summary>Create a string term.</summary>
+ /// <param name='str'>String value of the term.</param>
+ /// <returns>A string term.</returns>
+ /// <remarks>Create a string term that has the string value
+ /// specified by <paramref name="str"/>. It is evaluated to
+ /// itself. The string value can be modified by "ins", "del",
+ /// and "concat" functions.</remarks>
+ public Term (string str) { intval = 0; objval = new Str (str); }
+ // <list>...</list>
+
+ /// <summary>Create a list term.</summary>
+ /// <param name='list'>List value of the term.</param>
+ /// <returns>A list term.</returns>
+ /// <remarks>Create a list term that has the list value
+ /// specified by <paramref name="list"/>. It is evaluated to
+ /// itself. The list value can be modified by "ins", "del", and
+ /// "append" functions.</remarks>
+ public Term (List<Term> list) { intval = 0; objval = list; }
+ // <error ename="ERROR-NAME">ERROR-MESSASGE</error>
+
+ /// <summary>Create an error term.</summary>
+ /// <param name='name'>Name of the error.</param>
+ /// <param name='message'>Error message.</param>
+ /// <returns>An error term.</returns>
+ /// <remarks>Create an error term whose error name is <paramref
+ /// name="name"/> and error message is <paramref
+ /// name="message"/>. It is evaluated to itself.</remarks>
+ public Term (Symbol name, string message)
+ {
+ intval = 0;
+ objval = new ErrorTerm (name, message);
+ }
+
+ /// <summary>Create a term of a specific value</summary>
+ /// <param name='val'>Value of the term.</param>
+ /// <returns>A term.</returns>
+ /// <remarks>Create a term whose value is <paramref name="val">.
+ /// It is evaluated to a term that is returned by "Eval" method
+ /// of <paramref name="val">.</remarks>
+ public Term (TermValue val) { intval = 0; objval = val; }
+
+ internal Term (Str str) { intval = 0; objval = str; }
+
+ /// <summary>Create a varref term.</summary>
+ /// <param name='domain'>Domain to create the term in.</param>
+ /// <param name='vname'>Name of the referred variable.</param>
+ /// <returns>A varref term.</returns>
+ /// <remarks>Create a varref term that is evaluated to the value
+ /// of the referring variable.</remarks>
+ public Term (Domain domain, Symbol vname)
+ {
+ intval = 0;
+ objval = new Varref (vname);
+ }
+
+ /// <summary>Create a funcall term.</summary>
+ /// <param name='domain'>Domain to create the term in.</param>
+ /// <param name='fname'>Name of the calling function.</param>
+ /// <param name='args'>Array of terms that are given to the
+ /// function as arguments.</param>
+ /// <returns>A funcall term.</returns>
+ /// <remarks>Create a funcall term that is evaluated to a term
+ /// returned by the function <paramref name="fname"> when called
+ /// with <paramref name="args">.<remarks>
+ 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.GetVarCreate(vname);
+ 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 Error (Error.WrongType,
+ "term is an integer: {0}", this);
+ return objval;
+ }
+ }
+
+ public int Intval {
+ get {
+ if (objval != null)
+ throw new Error (Error.WrongType, "{0} is not an integer", this);
+ return intval;
+ }
+ }
+
+ public Str Strval {
+ get {
+ if (! IsStr)
+ throw new Error (Error.WrongType, "{0} is not a string", this);
+ return (Str) objval;
+ }
+ }
+
+ public string Symval {
+ get {
+ if (! IsSymbol)
+ throw new Error (Error.WrongType, "{0} is not a symbol", this);
+ return (Symbol) objval;
+ }
+ }
+
+ public List<Term> Listval {
+ get {
+ if (! IsList)
+ throw new Error (Error.WrongType, "{0} is not a list");
+ return (List<Term>) objval;
+ }
+ }
+
+ public bool IsTrue {
+ get {
+ return (objval == null
+ ? (intval != 0)
+ : objval is List<Term>
+ ? (((List<Term>) objval).Count != 0)
+ : objval is TermValue
+ ? ((TermValue) objval).IsTrue
+ : true);
+ }
+ }
+
+ public bool IsInt { get { return (objval == null); } }
+ public bool IsStr { get { return (objval is Str); } }
+ public bool IsSymbol { get { return (objval is Symbol); } }
+ public bool IsList { get { return (objval is List<Term>); } }
+ public bool IsError { get { return (objval is ErrorTerm); } }
+
+ internal Term Eval (Domain domain)
+ {
+ if (objval == null || objval is Symbol || objval is Str
+ || objval is List<Term>)
+ return this;
+ try {
+ domain.CallStackPush (this);
+ return ((TermValue) objval).Eval (domain);
+ } catch (Error e) {
+ if (e.Stack == null)
+ e.Stack = domain.CallStack;
+ throw e;
+ } finally {
+ domain.CallStackPop ();
+ }
+ }
+
+ public Term Clone ()
+ {
+ if (objval == null || objval is Symbol)
+ return this;
+ if (objval is Str)
+ return new Term (((Str) objval).ToString ());
+ 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 static bool operator== (Term t1, Term t2)
+ {
+ return t1.Equals (t2);
+ }
+
+ public static bool operator!= (Term t1, Term t2) { return ! (t1 == t2); }
+
+ public override bool Equals (object obj)
+ {
+ if (! (obj is Term))
+ return false;
+ Term term = (Term) obj;
+ if (IsInt)
+ return term.IsInt && term.Intval == Intval;
+ if (IsSymbol)
+ return term.IsSymbol && term.Symval == Symval;
+ if (IsStr)
+ return (term.IsStr && term.Strval.Equals (Strval));
+ if (IsList)
+ {
+ if (! term.IsList)
+ return false;
+ List<Term> l1 = objval as List<Term>;
+ List<Term> l2 = term.objval as List<Term>;
+
+ if (l1.Count != l2.Count)
+ return false;
+ for (int i = 0; i < l1.Count; i++)
+ if (! l1[i].Equals (l2[i]))
+ return false;
+ return true;
+ }
+ return ((TermValue) objval).Equals (obj);
+ }
+
+ public override int GetHashCode () { return intval; }
+
+ public bool Matches (Term term)
+ {
+ if (IsInt)
+ return term.IsInt && Intval == term.Intval;
+ if (IsSymbol)
+ return term.IsSymbol && Symval == term.Symval;
+ if (IsStr)
+ return term.IsStr && Strval.Matches (term.Strval);
+ if (IsList)
+ {
+ if (! term.IsList)
+ return false;
+ List<Term> l1 = objval as List<Term>;
+ List<Term> l2 = term.objval as List<Term>;
+
+ if (l1.Count > l2.Count)
+ return false;
+ for (int i = 0; i < l1.Count; i++)
+ if (! l1[i].Equals (l2[i]))
+ return false;
+ return true;
+ }
+ return ((TermValue) objval).Matches ((TermValue) term.objval);
+ }
+
+ public override string ToString () { return ToString (true); }
+
+ public string ToString (bool detail)
+ {
+ string str;
+
+ if (objval == null)
+ str = "<integer>" + intval + "</integer>";
+ else if (objval is Symbol)
+ str = "<symbol>" + objval + "</symbol>";
+ else if (objval is Str)
+ str = "<string>" + objval + "</string>";
+ else if (objval is List<Term>)
+ {
+ if (detail)
+ {
+ str = "<list>";
+ foreach (Term e in (List<Term>) objval)
+ str += e;
+ str += "</list>";
+ }
+ else
+ str = "<list/>";
+ }
+ else if (objval is Term)
+ str = "<quote>" + objval + "</quote>";
+ else
+ str = ((TermValue) objval).ToString (detail);
+ return str;
+ }
+ }
+
+ private static Term Zero = new Term (0);
+ private static Term One = new Term (1);
+ private static Term TermInt = new Term (Qinteger);
+ private static Term TermStr = new Term (Qstring);
+ private static Term TermSymbol = new Term (Qsymbol);
+ private static Term TermList = new Term (Qlist);
+ private static Term TermTerm = new Term ((Symbol) "term");
+
+ private static int parse_integer (XmlNode node)
+ {
+ string str = node.InnerText;
+ int len = str.Length;
+ int i, c;
+
+ if (len == 2 && str[0] == '?')
+ return str[1];
+ if (len > 2
+ && str[1] == 'x' && ((c = str[0]) == '0' || c == '#'))
{
- if (val is string)
- str = "\"" + ((string) val) + "\"";
+ if (! int.TryParse (str.Substring (2),
+ Globalization.NumberStyles.HexNumber, null,
+ out i))
+ throw new Error (Error.InvalidInteger, node,
+ "Not a integer string: {0}", str);
+ return i;
+ }
+ if (! int.TryParse (str, out i))
+ throw new Error (Error.InvalidInteger, node,
+ "Not a integer string: {0}", str);
+ return i;
+ }
+
+ private static Symbol parse_defvar (Domain domain, XmlNode node)
+ {
+ XmlAttribute name = node.Attributes[Qvname];
+ if (name == null)
+ throw new Error (Error.NoVariableName, node,
+ "No variable name to define");
+ Symbol vname = name.Value;
+ String desc;
+ Variable vari;
+
+ node = node.FirstChild;
+ if (node != null && node.Name == Qdescription)
+ {
+ desc = node.InnerText;
+ node = node.NextSibling;
+ }
+ else
+ desc = null;
+ if (node != null)
+ {
+ Symbol type = node.Name;
+ XmlNodeList range_list = null;
+ int nranges = 0;
+ XmlNode n = node.NextSibling;
+
+ if (n != null)
+ {
+ range_list = n.ChildNodes;
+ nranges = range_list.Count;
+ }
+
+ if (type == Qinteger)
+ {
+ int val = parse_integer (node);
+ int[] range = null;
+ if (range_list != null)
+ {
+ range = new int[nranges * 2];
+ for (int i = 0; i < nranges; i++)
+ {
+ XmlNode nd = range_list[i];
+ if (nd.Name == Qrange)
+ {
+ range[i * 2] = parse_integer (nd.FirstChild);
+ range[i * 2 + 1] = parse_integer (nd.LastChild);
+ }
+ else
+ {
+ range[i * 2] = range[i * 2 + 1]
+ = parse_integer (nd.FirstChild);
+ }
+ }
+ }
+ vari = domain.DefvarInt (vname, val, desc, range);
+ }
+ 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].FirstChild.InnerText;
+ }
+ vari = domain.DefvarStr (vname, node.InnerText, desc, range);
+ }
+ else if (type == Qsymbol)
+ {
+ Symbol[] range = null;
+ if (range_list != null)
+ {
+ range = new Symbol[nranges];
+ for (int i = 0; i < nranges; i++)
+ range[i] = range_list[i].FirstChild.InnerText;
+ }
+ vari = domain.DefvarSym (vname, (Symbol) node.InnerText, desc,
+ range);
+ }
else
- str = val.ToString ();
+ throw new Error (Error.TermTypeInvalid, "Unknown type: {0}", type);
}
else
- str = "()";
- return str;
+ {
+ if (domain.variables.TryGetValue (vname, out vari))
+ vari = vari.Clone (domain);
+ else
+ vari = new Variable (domain, vname, Zero);
+ domain.variables[vname] = vari;
+ }
+ return vname;
+ }
+
+ private static Variable[] parse_args (Domain domain, XmlNode node,
+ out int min_args, out int max_args)
+ {
+ int nfixed = 0;
+ int noptional = 0;
+ int nrest = 0;
+ Variable[] args;
+
+ 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)
+ {
+ if (nrest > 0)
+ throw new Error (Error.WrongType, n, "Too many <rest>");
+ nrest++;
+ }
+ else
+ throw new Error (Error.WrongType, n,
+ "Not fixed, optional, nor rest: {0}", n.Name);
+ }
+ min_args = nfixed;
+ max_args = nfixed + noptional + nrest;
+ args = new Variable[max_args];
+ n = node.FirstChild;
+ for (int i = 0; i < max_args; n = n.NextSibling)
+ args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value);
+ if (nrest == 1)
+ max_args = - max_args;
+ }
+ else
+ {
+ min_args = max_args = 0;
+ args = new Variable[0];
+ }
+ return args;
+ }
+
+ private static Symbol parse_defun_head (Domain domain, XmlNode node)
+ {
+ Symbol name = node.Attributes[Qfname].Value;
+ int min_args, max_args;
+ Variable[] args;
+
+ args = parse_args (domain, node, out min_args, out max_args);
+ if (node.Name == Qdefun)
+ domain.Defun (name, min_args, max_args, args, null);
+ else
+ domain.Defmacro (name, min_args, max_args, args, null);
+ return name;
+ }
+
+ private static void parse_defun_body (Domain domain, XmlNode node)
+ {
+ bool is_defun = node.Name == Qdefun;
+ Symbol name = node.Attributes[Qfname].Value;
+ Function func = domain.GetFunc (name);
+
+ for (node = node.FirstChild; node != null; node = node.NextSibling)
+ if (node.Name != Qdescription && node.Name != Qargs)
+ break;
+ Console.WriteLine ("found body " + node.Name);
+
+ Term[] body = Parse (domain, node, null);
+ if (is_defun)
+ ((Function.Lambda) func).SetBody (body);
+ else
+ ((Function.Macro) func).SetBody (body);
+ }
+
+ public static Term Parse (Domain domain, XmlNode node)
+ {
+ Symbol name = node.Name;
+
+ try {
+ if (name == Qinteger)
+ return new Term (parse_integer (node));
+ if (name == Qsymbol)
+ return new Term ((Symbol) node.InnerText);
+ if (name == Qstring)
+ return new Term (node.InnerText);
+ if (name == Qlist)
+ {
+ List<Term> list = new List<Term> ();
+ for (node = node.FirstChild; node != null;
+ node = node.NextSibling)
+ list.Add (Parse (domain, node));
+ return new Term (list);
+ }
+ if (name == Qdefun || name == Qdefmacro)
+ {
+ name = parse_defun_head (domain, node);
+ parse_defun_body (domain, node);
+ return new Term (name);
+ }
+ if (name == Qdefvar)
+ {
+ name = parse_defvar (domain, node);
+ return new Term (name);
+ }
+ MethodInfo parser;
+ if (domain.termtypes.TryGetValue (name, out parser))
+ {
+ object[] arg = new object[] { domain, node };
+ return new Term ((TermValue) parser.Invoke (null, arg));
+ }
+
+ Funcall funcall = (Funcall) Funcall.Parser (domain, node);
+ if (funcall.func is Function.Macro)
+ return funcall.Eval (domain);
+ return new Term (funcall);
+ } catch (Error e) {
+ if (e.Node == null)
+ e.Node = node;
+ throw e;
+ } catch (Exception e) {
+ throw new Error (Error.UnknownError, node, e, "Parsing error");
+ }
+ }
+
+ /// <summary>Parse a node and the following siblings as "term"s in a
+ /// specific domain.</summary>
+ /// <param name='domain'></param>
+ /// <param name='start'></param>
+ /// <param name='stop'></param>
+ /// <returns>Array of terms.</returns>
+
+ public static Term[] Parse (Domain domain, XmlNode start, XmlNode stop)
+ {
+ XmlNode n;
+ for (n = start; n != stop && n != null; n = n.NextSibling)
+ if (n.NodeType == XmlNodeType.Element
+ && (n.Name == Qdefun || n.Name == Qdefmacro))
+ {
+ try {
+ parse_defun_head (domain, n);
+ } catch (Error e) {
+ if (e.Node == null)
+ e.Node = n;
+ throw e;
+ } catch (Exception e) {
+ throw new Error (Error.UnknownError, n, e, "Parsing error");
+ }
+ }
+
+ List<Term> terms = new List<Term> ();
+ for (; start != n; start = start.NextSibling)
+ if (start.NodeType == XmlNodeType.Element)
+ {
+ try {
+ if (start.Name == Qdefun || start.Name == Qdefmacro)
+ parse_defun_body (domain, start);
+ else if (start.Name == Qdefvar)
+ parse_defvar (domain, start);
+ else
+ terms.Add (Parse (domain, start));
+ } catch (Error e) {
+ if (e.Node == null)
+ e.Node = start;
+ throw e;
+ } catch (Exception e) {
+ throw new Error (Error.UnknownError, start, e, "Parsing error");
+ }
+ }
+ return terms.ToArray ();
+ }
+
+ public static Term[] Parse (Domain domain, string url)
+ {
+ XmlDocument doc = new XmlDocument (Symbol.NameTable);
+ XmlNode node;
+
+ using (XmlTextReader reader = new XmlTextReader (url, Symbol.NameTable))
+ {
+ reader.WhitespaceHandling = WhitespaceHandling.None;
+ do {
+ reader.Read ();
+ } while (reader.NodeType != XmlNodeType.None
+ && (reader.NodeType != XmlNodeType.Element
+ || reader.Name != Qexpr));
+ if (reader.NodeType == XmlNodeType.None)
+ throw new Exception ("Node <expr> not found");
+ node = doc.ReadNode (reader);
+ }
+ return Parse (domain, node.FirstChild, null);
+ }
+
+ /// <summary>Evaluate a term in a specific domain.</summary>
+ /// <param name='domain'>Domain to evaluate the term in.</param>
+ /// <param name='term'>The term to evaluate.</param>
+ /// <returns>The result of evaluating the <paramref
+ /// name="term"/>.</returns>
+ public static Term Eval (Domain domain, Term term)
+ {
+ return Eval (domain, new Term[] { term });
+ }
+
+ /// <summary>Evaluate terms in a specific domain.</summary>
+ /// <param name='domain'>Domain to evaluate terms in.</param>
+ /// <param name='terms'>Array of terms to evaluate.</param>
+ /// <returns>The result of evaluating the last term of <paramref
+ /// name="terms"/>.</returns>
+ public static Term Eval (Domain domain, Term[] terms)
+ {
+ Term result = Zero;
+
+ try {
+ foreach (Term term in terms)
+ {
+ result = term.Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ }
+ return result;
+ } catch (Error e) {
+ throw e;
+ } catch (Exception e) {
+ throw new Error (Error.UnknownError, null, e, "Runtime error");
+ }
+ }
+
+ // TRACING
+
+ private static int trace_depth = 0;
+
+ /// <value> TraceDepth specifies the minimum depth of call stack
+ /// to suppress tracing. 0 means no tracing. </value>
+ public static int TraceDepth {
+ get { return trace_depth; }
+ set { trace_depth = value; }
}
}
}
projects / m17n / m17n-lib-cs.git / blobdiff