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 Xexpression
+ public static class Xexpression
{
- public static int debug_level = 0;
+ private static int trace_depth = 0;
- public struct Name : IEquatable<Name>
+ public static int TraceDepth {
+ get { return trace_depth; }
+ set { trace_depth = value; }
+ }
+
+ 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 Error (Symbol name, XmlNode node, Exception e,
+ string fmt, params object[] args)
+ : base (String.Format (fmt, args), e)
+ {
+ this.name = name;
+ this.node = node;
+ }
- public Name (string str)
+ public Error (Symbol name, string fmt, params object[] args)
+ : base (String.Format (fmt, args))
{
- name = nt.Add (str);
+ this.name = name;
}
- public static implicit operator Name (string str)
+ 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 Symbol Qexpr = "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 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 Nargs_unevalled = "args-unevalled";
- private static Name Nfixed = "fixed";
- private static Name Noptional = "optional";
- private static Name Nrest = "rest";
+ 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 Nvname = "vname";
- private static Name Ndescription = "description";
- private static Name Nrange = "range";
+ public static Symbol Qdefvar = "defvar";
+ private static Symbol Qvname = "vname";
+ private static Symbol Qdescription = "description";
+ private static Symbol Qrange = "range";
- private static Name Nprogn = "progn";
- private static Name Nloop = "loop";
- private static Name Nfunction = "function";
+ private static Symbol Qename = "ename";
- internal abstract class Function
+ public class Variable
{
- public Name name;
- public int min_arg, max_arg;
-
- public Function () { }
+ public Domain domain;
+ public readonly Symbol name;
+ protected Term val;
- public Function (Name name, int min_arg, int max_arg)
+ public Variable (Domain domain, Symbol name, Term val)
{
+ this.domain = domain;
this.name = name;
- this.min_arg = min_arg;
- this.max_arg = max_arg;
+ this.val = val;
}
- public abstract Term Call (Domain domain, Variable vari, Term[] args);
+ public Term Value { get { return val; } }
- public override string ToString ()
+ public virtual Term SetValue (Term val) { this.val = val; return val; }
+
+ public virtual Variable Clone (Domain domain)
{
- return name;
+ return new Variable (domain, name, val);
}
- internal class Subroutine : Function
+ public virtual void Reset () { val = Zero; }
+
+ public override string ToString () { return name + "(" + val + ")"; }
+
+ public abstract class Typed : Variable
{
- public Builtin builtin;
- public bool setvar;
+ protected string desc;
+ private Term default_val;
- public Subroutine (Builtin builtin, Name name, bool setvar,
- int min_arg, int max_arg)
- : base (name, min_arg, max_arg)
+ protected Typed (Domain domain, Symbol name, Term val, string desc)
+ : base (domain, name, val)
{
- this.builtin = builtin;
+ this.desc = desc;
+ default_val = val;
}
- public override Term Call (Domain domain, Variable vari, Term[] args)
- {
- Term[] newargs = new Term[args.Length];
+ public override void Reset () { val = default_val; }
+
+ public string Description {
+ get { return desc; }
+ set { desc = value; }
+ }
- for (int i = 0; i < args.Length; i++)
- newargs[i] = args[i].Eval (domain);
- return builtin (domain, vari, newargs);
+ 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);
}
- internal class SpecialForm : Function
+ public class IntType : Typed
{
- public Builtin builtin;
+ private int[] range;
- public SpecialForm (Builtin builtin, Name name,
- int min_arg, int max_arg)
- : base (name, min_arg, max_arg)
+ public bool IsSubrange (int[] r)
{
- this.builtin = builtin;
+ 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 override Term Call (Domain domain, Variable vari, Term[] args)
+ 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);
+ }
+
+ public override bool CheckValue (Term term)
{
- return builtin (domain, vari, args);
+ if (term.IsInt)
+ {
+ if (range == null)
+ return true;
+ int n = term.Intval;
+ for (int i = 0; i < range.Length; i += 2)
+ if (range[i] <= n && range[i + 1] >= n)
+ return true;
+ }
+ return false;
+ }
+
+ public override Variable Clone (Domain domain)
+ {
+ return new IntType (domain, name, val.Intval, desc, range);
}
+
+ public int[] Range { get { return range; } set { range = value; } }
}
- internal class Lambda : Function
+ public class StrType : Typed
{
- internal bool args_evalled;
- internal Variable[] args;
- internal Term[] body;
+ private string[] range;
+
+ 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);
+ }
- public Lambda (XmlNode node, Domain domain)
+ public override bool CheckValue (Term val)
{
- 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
+ if (val.IsStr)
{
- min_arg = max_arg = 0;
+ if (range == null)
+ return true;
+ Str str = val.Strval;
+ foreach (string s in range)
+ if (str.Equals (s))
+ return true;
}
+ return false;
}
- public void SetBody (XmlNode node, Domain domain)
+ public override Variable Clone (Domain domain)
{
- for (node = node.FirstChild; node != null; node = node.NextSibling)
- if (node.Name != Ndescription
- && node.Name != Nargs
- && node.Name != Nargs_unevalled)
- break;
- int nterms = 0;
- for (XmlNode n = node; n != null; n = n.NextSibling)
- nterms++;
- if (nterms > 0)
- {
- body = new Term[nterms];
- for (nterms = 0; node != null; node = node.NextSibling, nterms++)
- body[nterms] = new Term (node, domain);
- }
+ return new StrType (domain, name, val.Strval, desc, range);
}
- public override Term Call (Domain domain, Variable vari, Term[] args)
- {
- Bindings current = domain.bindings;
- Term result = Zero;
+ public string[] Range { get { return range; } set { range = value; } }
+ }
- try {
- int i;
- if (args_evalled)
+ public class SymType : Typed
+ {
+ public Symbol[] range;
+
+ public bool IsSubrange (Symbol[] r)
+ {
+ if (range == null)
+ return true;
+ for (int i = 0; i < r.Length; i++)
{
- Term[] newargs = new Term[args.Length];
- for (i = 0; i < min_arg; i++)
- newargs[i] = args[i].Eval (domain);
- args = newargs;
+ int j;
+ for (j = 0; j < range.Length; j++)
+ if (range[j] == r[i])
+ break;
+ if (j >= range.Length)
+ return false;
}
- for (i = 0; i < min_arg; i++)
- domain.Bind (this.args[i], args[i]);
- if (body != null)
- foreach (Term term in body)
- result = term.Eval (domain);
- } finally {
- domain.UnboundTo (current);
+ return true;
}
- return result;
+
+ public SymType (Domain domain, Symbol name, Symbol sym, string desc,
+ Symbol[] range)
+ : base (domain, name, new Term (sym), desc)
+ {
+ this.range = range;
+ CheckValue (val);
+ }
+
+ 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; } }
}
}
- public abstract class Variable
+ public abstract class Function
{
- public readonly Name name;
- internal Term val;
+ 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 Variable (Name name, Term term)
+ public Function (Symbol name, bool with_var, int min_args, int max_args)
{
this.name = name;
- Value = term;
+ this.with_var = with_var;
+ this.min_args = min_args;
+ this.max_args = max_args;
+ }
+
+ public abstract Term Call (Domain domain, Variable vari, Term[] args);
+
+ public override string ToString ()
+ {
+ return name;
}
- public Term Value
+ internal class Subroutine : Function
{
- get { return val; }
- set
+ public Builtin builtin;
+
+ public Subroutine (Builtin builtin, Symbol name, bool with_var,
+ int min_args, int max_args)
+ : base (name, with_var, min_args, max_args)
{
- if (! ValueP (value))
- throw new Exception ("Invalid value of " + name + ": " + value);
- val = value;
+ this.builtin = builtin;
}
+
+ 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 abstract bool ValueP (Term term);
+ internal class SpecialForm : Function
+ {
+ public Builtin builtin;
- public override string ToString () { return name + "(" + val + ")"; }
+ 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;
+ }
- internal class Int : Variable
- {
- public struct Range
+ public override Term Call (Domain domain, Variable vari, Term[] args)
{
- public int from, to;
+ return builtin (domain, vari, args);
}
+ }
+
+ internal class Lambda : Function
+ {
+ private Variable[] args;
+ private Term[] body;
- public Range[] ranges;
+ 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;
+ }
- public Int (Name name, int i) : base (name, new Term (i)) { }
+ public void SetBody (Term[] body)
+ {
+ this.body = body;
+ }
- public override bool ValueP (Term term)
+ public override Term Call (Domain domain, Variable vari, Term[] args)
{
- int i;
+ Bindings current = domain.bindings;
+ Term result = Zero;
+ int limit = max_args >= 0 ? args.Length : args.Length - 1;
- if (term.objval != null)
- 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;
+ 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);
+
+ 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 Str : Variable
+ internal class Macro : Function
{
- public string[] ranges;
+ private Variable[] args;
+ private Term[] body;
- public Str (Name name, string str) : base (name, new Term (str)) { }
+ 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 (Term term)
+ public void SetBody (Term[] body)
{
- if (! (term.objval is string))
- return false;
- if (ranges == null)
- return true;
- string str = (string) term.objval;
- foreach (string s in ranges)
- if (s == str)
- return true;
- return false;
+ this.body = body;
}
- }
- internal class Misc : Variable
- {
- public Misc (Name name, Term term) : base (name, term) { }
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ Bindings current = domain.bindings;
+ Term result = Zero;
- public override bool ValueP (Term term) { return true; }
+ 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;
+ }
}
}
private Bindings (Variable vari)
{
this.vari = vari;
- old_value = vari.val;
+ old_value = vari.Value;
}
public static Bindings Bind (Bindings bindings, Variable vari, Term val)
{
Bindings b = new Bindings (vari);
- b.vari.Value = val;
+ b.vari.SetValue (val);
b.next = bindings;
return b;
}
internal Bindings UnboundTo (Bindings boundary)
{
for (Bindings b = this; b != boundary; b = b.next)
- b.vari.val = b.old_value;
+ b.vari.SetValue (b.old_value);
return boundary;
}
}
}
-#if false
- internal class ThrowException : Exception
- {
- Name tag;
- public object value;
-
- public ThrowException (Name tag, object value) : base ()
- {
- this.tag = tag;
- this.value = value;
- }
- }
-#endif
-
internal struct CatchTag
{
- public readonly Name name;
- public readonly int count;
+ private Term tag;
+ public Term Tag { get { return tag; } }
- public CatchTag (Name name, int count)
- {
- this.name = name;
- this.count = count;
- }
+ // 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);
}
public class Domain
{
+ public Symbol name;
public object context;
public int depth = 0;
-
- internal Dictionary<Name, Function> functions;
- internal Dictionary<Name, Variable> variables;
+ 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;
- internal Stack<CatchTag> catch_list = new Stack<CatchTag> ();
+ 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 (Symbol name, object context)
+ : this (name, basic, context) { }
- public Domain (object context) : this (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 ();
}
+ 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);
}
- internal void Catch (Name name)
+ internal void Catch (CatchTag tag)
+ {
+ catch_stack.Push (tag);
+ catch_count++;
+ }
+
+ internal void Uncatch ()
{
- catch_list.Push (new CatchTag (name, catchcount++));
+ catch_stack.Pop ();
+ if (catch_count > catch_stack.Count)
+ catch_count--;
}
- internal bool Catched {
- get { return catch_list.Peek ().count == catchcount; }
+ public bool Thrown () { return catch_count < catch_stack.Count; }
+
+ public bool Thrown (out bool caught)
+ {
+ if (catch_count < catch_stack.Count)
+ {
+ caught = catch_count == catch_stack.Count - 1;
+ return true;
+ }
+ caught = false;
+ return false;
}
internal void ThrowReturn ()
{
- catch_list.Peek ().count = catchcount;
+ foreach (CatchTag elt in catch_stack)
+ {
+ catch_count--;
+ if (elt.Tag == CatchTag.Return.Tag)
+ break;
+ }
}
internal void ThrowBreak ()
{
- catch_list.Peek ().count = catchcount;
+ if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
+ throw new Error (Error.NoLoopToBreak,
+ "No surrounding loop to break");
+ catch_count--;
}
- internal void Uncatch ()
+ internal void ThrowSymbol (Term tag)
+ {
+ int i = catch_count;
+ foreach (CatchTag elt in catch_stack)
+ {
+ i--;
+ if (elt.Tag.Matches (tag))
+ {
+ catch_count = i;
+ return;
+ }
+ }
+ throw new Error (Error.UncaughtThrow,
+ "No corresponding catch: {0}", tag);
+ }
+
+ public void DefType (Type type)
+ {
+ 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;
+ }
+
+ private void check_func_head (Symbol name, bool with_var,
+ int min_args, int max_args, bool as_macro)
{
- catch_list.Pop ();
+ 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);
+ }
}
- public void DefSubr (Builtin builtin, string str, bool setvar,
- int min_arg, int max_arg, params string[] aliases)
+ public void DefSubr (Function.Builtin builtin, Symbol name,
+ bool with_var, int min_args, int max_args)
{
- Name 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;
+ 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 DefSpecial (Builtin builtin, string str,
- int min_arg, int max_arg,
- params string[] aliases)
+ public void DefSpecial (Function.Builtin builtin, Symbol name,
+ bool with_var, int min_args, int max_args)
{
- Name 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;
+ check_func_head (name, with_var, min_args, max_args, false);
+ functions[name] = new Function.SpecialForm (builtin, name, with_var,
+ min_args, max_args);
}
- public void DefAlias (string alias, string str)
+ public void Defun (Symbol name, int min_args, int max_args,
+ Variable[] args, Term[] body)
{
- functions[(Name) alias] = functions[(Name) str];
+ check_func_head (name, false, min_args, max_args, false);
+ functions[name] = new Function.Lambda (name, min_args, max_args,
+ args, body);
}
- internal Function.Lambda RegisterFunction (XmlNode node)
+ public void Defun (Function func)
{
- Function.Lambda lambda = new Function.Lambda (node, this);
+ functions[func.name] = func;
+ }
- functions[lambda.name] = lambda;
- return lambda;
+ public void Defmacro (Symbol name, int min_args, int max_args,
+ Variable[] args, Term[] body)
+ {
+ check_func_head (name, false, min_args, max_args, true);
+ functions[name] = new Function.Macro (name, min_args, max_args,
+ args, body);
}
- internal Function Defun (XmlNode node)
+ public void DefAlias (Symbol alias, Symbol fname)
{
- Name name = node.Attributes[Nfname].Value;
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;
+ }
- if (! functions.TryGetValue (name, out func))
- func = RegisterFunction (node);
- ((Function.Lambda) func).SetBody (node, this);
- return func;
+ public Variable Defvar (Variable vari)
+ {
+ vari = vari.Clone (this);
+ variables[vari.name] = vari;
+ return vari;
}
- public void Defvar (XmlNode node)
+ internal Variable Defvar (Symbol name)
{
- Name name = node.Attributes[0].Value;
Variable vari;
- node = node.FirstChild;
- if (node.Name == Ndescription)
- node = node.NextSibling;
- if (node != null)
+ if (variables.TryGetValue (name, out vari))
{
- Name type = node.Name;
- XmlNodeList range_list = null;
- int nranges = 0;
- string val = node.InnerText;
-
- node = node.NextSibling;
- if (node != null)
- {
- range_list = node.ChildNodes;
- nranges = range_list.Count;
- }
+ 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;
+ }
+
+ public Variable DefvarInt (Symbol name, int n, string desc, int[] range)
+ {
+ Variable vari;
- if (type == Ninteger)
+ 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)
{
- Variable.Int vi = new Variable.Int (name, parse_integer (val));
- if (range_list != null)
- {
- vi.ranges = new Variable.Int.Range[nranges];
-
- for (int i = 0; i < nranges; i++)
- {
- XmlNode n = range_list[i];
-
- if (n.Name == Nrange)
- {
- vi.ranges[i].from =
- parse_integer (n.FirstChild.InnerText);
- vi.ranges[i].to =
- parse_integer (n.LastChild.InnerText);
- }
- else
- {
- int num = parse_integer (n.InnerText);
- vi.ranges[i].from = vi.ranges[i].to = num;
- }
- }
- }
- vari = vi;
+ if (! intvari.IsSubrange (range))
+ throw new Error (Error.VariableRangeConflict,
+ "Conflicting variable range: {0}", name);
+ intvari.Range = range;;
}
- else if (type == Nstring)
+ if (desc != null)
+ intvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.IntType (this, name, n, desc, range);
+ variables[name] = vari;
+ }
+ return vari;
+ }
+
+ public Variable DefvarStr (Symbol name, string str, string desc,
+ string[] range)
+ {
+ Variable vari;
+
+ if (variables.TryGetValue (name, out vari))
+ {
+ Variable.StrType strvari = vari as Variable.StrType;
+ if (strvari == null)
+ throw new Error (Error.VariableTypeConflict,
+ "Not a string variable: {0}", name);
+ if (range != null)
{
- Variable.Str vs = new Variable.Str (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;
+ if (! strvari.IsSubrange (range))
+ throw new Error (Error.VariableRangeConflict,
+ "Conflicting variable range: {0}", name);
+ strvari.Range = range;
}
- else
- throw new Exception ("Unknown type: " + type);
+ if (desc != null)
+ strvari.Description = desc;
}
else
- vari = new Variable.Misc (name, Zero);
- variables[name] = vari;
+ {
+ vari = new Variable.StrType (this, name, new Str (str), desc,
+ range);
+ variables[name] = vari;
+ }
+ return vari;
}
- internal Variable Defvar (Name name)
+ public Variable DefvarSym (Symbol name, Symbol sym, string desc,
+ Symbol[] range)
{
- Variable vari = new Variable.Misc (name, Zero);
- variables[name] = vari;
+ 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 (Name name)
+ internal Function GetFunc (Symbol name)
{
Function func;
-
if (! functions.TryGetValue (name, out func))
- throw new Exception ("Unknown function: " + name);
+ throw new Error (Error.UnknownFunction,
+ "Unknown function: {0}", name);
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 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))
- variables[name] = vari = new Variable.Misc (name, Zero);
+ return null;
return vari;
}
public override string ToString ()
{
string str = "<(functions";
- foreach (KeyValuePair<Name, Function> kv in functions)
+ foreach (KeyValuePair<Symbol, Function> kv in functions)
str += " " + kv.Key;
str += ") (variabls";
- foreach (KeyValuePair<Name, Variable> kv in variables)
- str += " " + kv.Key;
+ foreach (KeyValuePair<Symbol, Variable> kv in variables)
+ str += " " + kv.Value;
str += ")";
if (bindings != null)
str += " " + bindings;
return str;
}
- internal void DebugWrite (bool head, string fmt, params string[] arg)
+ internal void TraceWrite (string fmt, params string[] arg)
{
- if (debug_level > depth)
+ if (trace_depth > depth)
{
- if (head)
- {
- Console.WriteLine ();
- for (int i = 0; i < depth; i++)
- Console.Write (" ");
- }
- Console.Write (fmt, arg);
+ for (int i = 0; i < depth; i++)
+ Console.Write (" ");
+ Console.WriteLine (fmt, arg);
}
}
- }
- public delegate Term Builtin (Domain domain, Variable vari, Term[] args);
+ 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;
+ }
- private static Domain basic = new Domain ();
+ public void RestoreValues (object values)
+ {
+ foreach (KeyValuePair<Variable,Term> kv
+ in (Dictionary<Variable,Term>) values)
+ kv.Key.SetValue (kv.Value);
+ }
+ }
- internal static Function Fprogn;
+ private static Domain basic = new Domain ("basic");
static Xexpression ()
{
- basic.DefSubr (set_value, "set", true, 1, 1, "=");
- basic.DefSubr (not, "not", false, 1, 1, "!");
- basic.DefSubr (add, "add", true, 1, -1, "+");
- basic.DefSubr (mul, "mul", true, 1, -1, "*");
- basic.DefSubr (sub, "sub", true, 1, -1, "-");
- basic.DefSubr (div, "div", true, 1, -1, "/");
- basic.DefSubr (mod, "mod", true, 1, 2, "%");
- basic.DefSubr (logior, "logior", true, 1, -1, "|");
- basic.DefSubr (logand, "logand", true, 1, -1, "&");
- basic.DefSubr (lsh, "lsh", true, 1, 2, "<<");
- basic.DefSubr (rsh, "rsh", true, 1, 2, ">>");
- basic.DefSubr (eq, "eq", false, 2, -1, "==");
- basic.DefSubr (noteq, "noteq", false, 2, 2, "!=");
- basic.DefSubr (less_than, "lt", false, 2, -1, "<");
- basic.DefSubr (less_eq, "le", false, 2, -1, "<=");
- basic.DefSubr (greater_than, "gt", false, 2, -1, ">");
- basic.DefSubr (greater_eq, "ge", false, 2, -1, ">=");
- basic.DefSubr (append, "append", true, 0, -1);
- basic.DefSubr (concat, "concat", true, 0, -1);
- basic.DefSubr (nth, "nth", false, 2, 2);
- basic.DefSubr (copy, "copy", false, 1, 1);
- basic.DefSubr (ins, "ins", true, 2, 2);
- basic.DefSubr (del, "del", true, 2, 2);
- basic.DefSubr (eval_clause, "eval", false, 1, 1);
- basic.DefSubr (break_clause, "break", false, 0, 1);
- basic.DefSubr (return_clause, "return", false, 1, 1);
- basic.DefSpecial (and, "and", 1, -1, "&&");
- basic.DefSpecial (or, "or", 1, -1, "||");
- basic.DefSpecial (progn_clause, "progn", 0, -1, "expr");
- basic.DefSpecial (if_clause, "if", 2, 3);
- basic.DefSpecial (when_clause, "when", 1, -1);
- basic.DefSpecial (loop_clause, "loop", 1, -1);
- basic.DefSpecial (while_clause, "while", 1, -1);
- basic.DefSpecial (cond_clause, "cond", 1, -1);
- basic.DefSpecial (foreach_clause, "foreach", 2, -1);
- basic.DefSpecial (quote_clause, "quote", 1, 1);
- basic.DefSpecial (type_clause, "type", 1, 1);
-
- Fprogn = basic.GetFunc (Nprogn);
- }
-
- private static Term set_value (Domain domain, Variable vari, Term[] args)
- {
- vari.Value = args[0];
- return vari.val;
- }
-
- private static Term not (Domain domain, Variable vari, Term[] args)
+ 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 Term Fset (Domain domain, Variable vari, Term[] args)
+ {
+ if (vari == null)
+ throw new Error (Error.NoVariableName, "No variable name to set");
+ vari.SetValue (args[0]);
+ return args[0];
+ }
+
+ private static Term Fnot (Domain domain, Variable vari, Term[] args)
{
return args[0].IsTrue ? Zero : One;
}
- private static Term add (Domain domain, Variable vari, Term[] args)
+ static Term maybe_set_intvar (Variable vari, int n)
+ {
+ Term term = new Term (n);
+ if (vari != null)
+ vari.SetValue (term);
+ return term;
+ }
+
+
+ private static Term Fadd (Domain domain, Variable vari, Term[] args)
{
- int n = vari == null ? 0 : vari.val.Intval;
+ int n = vari == null ? 0 : vari.Value.Intval;
foreach (Term arg in args)
- n += (int) arg;
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n += arg.Intval;
+ return maybe_set_intvar (vari, n);
}
- private static Term mul (Domain domain, Variable vari, Term[] args)
+ private static Term Fmul (Domain domain, Variable vari, Term[] args)
{
- int n = vari == null ? 1 : vari.val.Intval;
+ int n = vari == null ? 1 : vari.Value.Intval;
foreach (Term arg in args)
- n *= (int) arg;
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n *= arg.Intval;
+ return maybe_set_intvar (vari, n);
}
- private static Term sub (Domain domain, Variable vari, Term[] args)
+ private static Term Fsub (Domain domain, Variable vari, Term[] args)
{
int n, i;
}
else
{
- n = vari.val.Intval;
+ n = vari.Value.Intval;
i = 0;
}
while (i < args.Length)
- n -= (int) args[i++];
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n -= args[i++].Intval;
+ return maybe_set_intvar (vari, n);
}
- private static Term div (Domain domain, Variable vari, Term[] args)
+ private static Term Fdiv (Domain domain, Variable vari, Term[] args)
{
int n, i;
}
else
{
- n = vari.val.Intval;
+ n = vari.Value.Intval;
i = 0;
}
while (i < args.Length)
n /= args[i++].Intval;
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ return maybe_set_intvar (vari, n);
}
- private static Term mod (Domain domain, Variable vari, Term[] args)
+ private static Term Fmod (Domain domain, Variable vari, Term[] args)
{
- if (vari == null)
- return (args[0].Intval % args[1].Intval);
- vari.val.intval = vari.val.Intval % args[0].Intval;
- return vari.val;
+ return maybe_set_intvar (vari, args[0].Intval % args[1].Intval);
}
- private static Term logior (Domain domain, Variable vari, Term[] args)
+ private static Term Flogior (Domain domain, Variable vari, Term[] args)
{
- int n = vari == null ? 0 : vari.val.Intval;
+ int n = vari == null ? 0 : vari.Value.Intval;
foreach (Term arg in args)
- n |= (int) arg;
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n |= arg.Intval;
+ return maybe_set_intvar (vari, n);
}
- private static Term logand (Domain domain, Variable vari, Term[] args)
+ private static Term Flogand (Domain domain, Variable vari, Term[] args)
{
int n, i;
}
else
{
- n = vari.val.Intval;
+ n = vari.Value.Intval;
i = 0;
}
while (i < args.Length)
- n &= (int) args[i++];
- if (vari == null)
- return n;
- vari.val.intval = n;
- return vari.val;
+ n &= args[i++].Intval;
+ return maybe_set_intvar (vari, n);
}
- private static Term lsh (Domain domain, Variable vari, Term[] args)
+ private static Term Flsh (Domain domain, Variable vari, Term[] args)
{
- if (vari == null)
- return args[0].Intval << args[1].Intval;
- vari.val.intval = vari.val.Intval << args[0].Intval;
- return vari.val;
+ return maybe_set_intvar (vari, args[0].Intval << args[1].Intval);
}
- private static Term rsh (Domain domain, Variable vari, Term[] args)
+ private static Term Frsh (Domain domain, Variable vari, Term[] args)
{
- if (vari == null)
- return args[0].Intval >> args[1].Intval;
- vari.val.intval = vari.val.Intval >> args[0].Intval;
- return vari.val;
+ return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval);
}
- private static Term eq (Domain domain, Variable vari, Term[] args)
+ private static Term Feq (Domain domain, Variable vari, Term[] args)
{
Term o = args[0];
return One;
}
- private static Term noteq (Domain domain, Variable vari, Term[] args)
+ private static Term Fnoteq (Domain domain, Variable vari, Term[] args)
{
- return eq (domain, vari, args);
+ return Feq (domain, vari, args);
}
- private static Term less_than (Domain domain, Variable vari, Term[] args)
+ private static Term Flt (Domain domain, Variable vari, Term[] args)
{
- int n = (int) args[0];
+ int n = args[0].Intval;
for (int i = 1; i < args.Length; i++)
{
- int n1 = (int) args[i];
+ int n1 = args[i].Intval;
if (n >= n1)
return Zero;
n = n1;
return One;
}
- private static Term less_eq (Domain domain, Variable vari, Term[] args)
+ 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;
return One;
}
- private static Term greater_than (Domain domain, Variable vari, Term[] args)
+ 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;
return One;
}
- private static Term greater_eq (Domain domain, Variable vari, Term[] args)
+ 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;
return One;
}
- private static Term append (Domain domain, Variable vari, Term[] args)
+ private static Term Fappend (Domain domain, Variable vari, Term[] args)
{
List<Term> list;
if (vari == null)
list = new List<Term> ();
else
- list = vari.val.Listval;
+ list = vari.Value.Listval;
foreach (Term arg in args)
{
result.objval = list;
return result;
}
- vari.val.objval = list;
- return vari.val;
+ return vari.Value;
}
- private static Term concat (Domain domain, Variable vari, Term[] args)
+ private static Term Fconcat (Domain domain, Variable vari, Term[] args)
{
- string str;
-
- if (vari == null)
- str = "";
- else
- str = vari.val.Strval;
+ Str str = vari == null ? new Str ("") : vari.Value.Strval;
foreach (Term arg in args)
{
if (arg.IsStr)
- str += (string) arg.objval;
+ str.Insert (-1, arg.Strval);
else if (arg.IsList)
- foreach (Term term in (List<Term>) arg.objval)
- str += (char) term.Intval;
+ foreach (Term term in arg.Listval)
+ str.Insert (-1, (char) term.Intval);
else
- str += (char) arg.Intval;
- }
- if (vari == null)
- {
- Term result;
- result.intval = 0;
- result.objval = str;
- return result;
+ str.Insert (-1, (char) arg.Intval);
}
- vari.val.objval = str;
- return vari.val;
+ return vari == null ? new Term (str) : vari.Value;
}
- private static Term nth (Domain domain, Variable vari, Term[] args)
+ private static Term Fnth (Domain domain, Variable vari, Term[] args)
{
- Term result;
-
if (args[1].IsStr)
- {
- result.intval = ((string) args[1].objval)[args[0].Intval];
- result.objval = null;
- }
- else if (args[1].IsList)
- {
- result = ((List<Term>) args[1].objval)[args[0].Intval];
- }
- else
- throw new Exception ("Term is not enumelable: " + args[1]);
- return result;
+ 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 Term copy (Domain domain, Variable vari, Term[] args)
+ private static Term Fcopy (Domain domain, Variable vari, Term[] args)
{
- Term result;
-
- result.intval = 0;
- result.objval = new List<Term> (args[0].Listval);
- return result;
+ return args[0].Clone ();
}
- private static Term ins (Domain domain, Variable vari, Term[] args)
+ private static Term Fins (Domain domain, Variable vari, Term[] args)
{
- if (vari.val.IsStr)
- vari.val.objval
- = vari.val.Strval.Insert (args[0].Intval, args[1].Strval);
- else if (vari.val.IsList)
- vari.val.Listval.InsertRange (args[0].Intval, args[1].Listval);
+ 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 Exception ("term is not collection: " + vari.val);
- return vari.val;
+ throw new Error (Error.WrongType, "Not a string nor a list: {0}",
+ vari.Value);
+ return vari.Value;
}
- private static Term del (Domain domain, Variable vari, Term[] args)
+ private static Term Fdel (Domain domain, Variable vari, Term[] args)
{
- if (vari.val.IsStr)
- vari.val.objval
- = vari.val.Strval.Remove (args[0].Intval,
- args[1].Intval - args[0].Intval);
-
- else if (vari.val.IsList)
- vari.val.Listval.RemoveRange (args[0].Intval,
- args[1].Intval - args[0].Intval);
+ 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 Exception ("term is not collection: " + vari.val);
- return vari.val;
+ throw new Error (Error.WrongType, "Not a string nor a list: {0}",
+ vari.Value);
+ return vari.Value;
}
- private static Term and (Domain domain, Variable vari, Term[] args)
+ private static Term Fand (Domain domain, Variable vari, Term[] args)
{
foreach (Term arg in args)
- if (! arg.Eval (domain).IsTrue)
- return Zero;
+ {
+ Term result = arg.Eval (domain);
+ if (domain.Thrown ())
+ result;
+ if (! result.IsTrue)
+ return Zero;
+ }
return One;
}
- private static Term or (Domain domain, Variable vari, Term[] args)
+ private static Term For (Domain domain, Variable vari, Term[] args)
{
foreach (Term arg in args)
- if (arg.Eval (domain).IsTrue)
- return One;
+ {
+ Term result = arg.Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ if (result.IsTrue)
+ return One;
+ }
return Zero;
}
- private static Term eval_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Feval (Domain domain, Variable vari, Term[] args)
{
return (args[0].Eval (domain));
}
- private static Term progn_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Fprogn (Domain domain, Variable vari, Term[] args)
{
Term result = One;
foreach (Term arg in args)
- result = arg.Eval (domain);
+ {
+ result = arg.Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ }
return result;
}
- private static Term if_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Fif (Domain domain, Variable vari, Term[] args)
{
- if (args[0].Eval (domain).IsTrue)
+ Term result = args[0].Eval (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);
}
- private static Term when_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Fwhen (Domain domain, Variable vari, Term[] args)
{
- if (! args[0].Eval (domain).IsTrue)
+ Term result = args[0].Eval (domain);
+
+ if (domain.Thrown)
+ return result;
+ if (! result.IsTrue)
return Zero;
- Term result = One;
+ result = One;
for (int i = 1; i < args.Length; i++)
- result = args[i].Eval (domain);
+ {
+ result = args[i].Eval (domain);
+ if (domain.Thrown)
+ return result;
+ }
return result;
}
- private static Term break_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Freturn (Domain domain, Variable vari, Term[] args)
{
- Stack<CatchTag> clist = domain.catch_list;
- if (clist.Count == 0)
- throw new Exception ("No outer loop to break");
- CatchTag tag = clist.Peek ();
- if (tag.name != Nloop)
- throw new Exception ("No outer loop to break");
- domain.depth = tag.depth;
+ domain.ThrowReturn ();
return args.Length == 0 ? Zero : args[0];
}
- private static Term return_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Fbreak (Domain domain, Variable vari, Term[] args)
{
- Stack<CatchTag> clist = domain.catch_list;
-
- while (clist.Count > 0)
- {
- CatchTag tag = clist.Pop ();
- if (tag.name == Nfunction)
- {
- domain.depth = tag.depth;
- return = args.Length == 0 ? Zero : args[0];
- }
- }
+ domain.ThrowBreak ();
return args.Length == 0 ? Zero : args[0];
}
- private static Term loop_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Floop (Domain domain, Variable vari, Term[] args)
{
- domain.Catch (Nloop);
Term result = Zero;
try {
- while (! domain.Catched)
+ domain.Catch (CatchTag.Break);
+ while (! domain.Thrown ())
foreach (Term arg in args)
{
result = arg.Eval (domain);
- if (domain.Catched)
- break;
+ if (domain.Thrown ())
+ return result;
}
} finally {
domain.Uncatch ();
return result;
}
- private static Term while_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Fwhile (Domain domain, Variable vari, Term[] args)
{
- while (args[0].Eval (domain).IsTrue)
- for (int i = 1; i < args.Length; i++)
- args[i].Eval (domain);
- return Zero;
+ 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;
}
- private static Term cond_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Fcond (Domain domain, Variable vari, Term[] args)
{
foreach (Term arg in args)
{
if (result.IsTrue)
{
for (int i = 1; i < list.Count; i++)
- result = list[i].Eval (domain);
+ {
+ domain.depth++;
+ result = list[i].Eval (domain);
+ domain.depth--;
+ if (domain.Thrown ())
+ return result;
+ }
return result;
}
}
return Zero;
}
- private static Term foreach_clause (Domain domain, Variable vari,
- Term[] args)
+ private static Term Fforeach (Domain domain, Variable vari, Term[] args)
{
- List<Term> list = args[0].Listval;
+ Term result = args[0].Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ List<Term> list = result.Listval;
Bindings current = domain.bindings;
- foreach (Term term in list)
- {
- domain.Bind (vari, term);
- try {
- for (int i = 1; i < args.Length; i++)
- args[i].Eval (domain);
- } finally {
- domain.UnboundTo (current);
+ 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);
+ }
}
- }
- return Zero;
+ } finally {
+ domain.Uncatch ();
+ }
+ return result;
}
- private static Term quote_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Fquote (Domain domain, Variable vari, Term[] args)
{
- return new Term (args[0]);
+ return args[0];
}
- private static Term type_clause (Domain domain, Variable vari, Term[] args)
+ private static Term Ftype (Domain domain, Variable vari, Term[] args)
{
if (args[0].IsInt)
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 struct Term
+ private static Term eval_terms (Domain domain, Term[] terms, int idx,
+ out bool caught)
{
- public int intval;
- public object objval;
+ Term result= Zero;
- public Term (int i) { intval = i; objval = null; }
- public Term (Name 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; }
+ caught = false;
+ for (int i = idx; i < terms.Length; i++)
+ {
+ result = terms[i].Eval (domain);
+ if (domain.Thrown (out caught))
+ return result;
+ }
+ return result;
+ }
- public Term (XmlNode node, Domain domain)
+ 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)
{
- Name name = node.Name;
+ try {
+ result = eval_terms (domain, args, 1, out caught);
+ } catch (System.Exception exception) {
+ Term term;
- if (name == Ninteger)
- {
- intval = parse_integer (node.InnerText);
- objval = null;
- }
- else
- {
- intval = 0;
- if (name == Nsymbol)
- objval = (Name) node.InnerText;
- else if (name == Nstring)
- objval = node.InnerText.Clone ();
- else if (name == Nvarref)
- objval = domain.GetVar ((Name) node.Attributes[0].Value);
- 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));
- 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);
- }
- }
+ 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]);
+ }
- private class Funcall
+ 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)
{
- internal Function func;
- internal Variable vari;
- internal Term[] args;
+ if (vari == null || vari.domain != domain)
+ vari = domain.GetVarCreate (vname);
+ return vari.Value;
+ }
- public Funcall (Function func, Variable vari, Term[] args)
+ 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 Term Eval (Domain domain)
- {
- domain.DebugWrite (true, "(({0}", func.name);
- for (int i = 0; i < args.Length; i++)
- domain.DebugWrite (false, " {0}", args[i].ToString ());
- domain.DebugWrite (false, ")");
+ 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++;
- Term result = func.Call (domain, vari, args);
+ result = func.Call (domain, vari, args);
+ } finally {
domain.depth--;
- domain.DebugWrite (true, " ==> {0})", result.ToString ());
- return result;
}
+ domain.TraceWrite ("=> {0}", result.ToString ());
+ return result;
+ }
- public override string ToString ()
- {
- string str = "<funcall fname=\"" + func.name;
- if (args == null)
- return str + "\"/>";
- str += "\">";
+ 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 + "</funcall>");
+ 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; }
+ }
+
+ public struct Term
+ {
+ public int intval;
+ public object objval;
+
+ // <integer>...</integer>
+ public Term (int i) { intval = i; objval = null; }
+ // <symbol>...</symbol>
+ public Term (Symbol name) { intval = 0; objval = name; }
+ // <string>...</string>
+ public Term (string str) { intval = 0; objval = new Str (str); }
+ // <list>...</list>
+ public Term (List<Term> list) { intval = 0; objval = list; }
+ // <error ename="ERROR-NAME">ERROR-MESSASGE</error>
+ public Term (Symbol name, string message)
+ {
+ intval = 0;
+ objval = new ErrorTerm (name, message);
+ }
+
+ public Term (Str str) { intval = 0; objval = str; }
+ public Term (TermValue obj) { intval = 0; objval = obj; }
+
+ // <varref vname="VNAME"/>
+ public Term (Domain domain, Symbol vname)
+ {
+ intval = 0;
+ objval = new Varref (vname);
+ }
+
+ // <funcall fname="FNAME">...</funcall>
+ public Term (Domain domain, Symbol fname, Term[] args)
+ : this (domain, fname, Qnull, args) { }
+
+ // <funcall fname="FNAME" vname="VNAME">...</funcall>
+ public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
+ {
+ intval = 0;
+
+ Function func = domain.GetFunc (fname);
+ Variable vari = vname == Qnull ? null : domain.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 Exception ("term is not integer: " + this);
+ throw new Error (Error.WrongType, "{0} is not an integer", this);
return intval;
}
}
- public string Strval {
+ public Str Strval {
get {
if (! IsStr)
- throw new Exception ("term is not string: " + this);
- return (string) objval;
+ 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 Exception ("term is not list: " + this);
+ throw new Error (Error.WrongType, "{0} is not a list");
return (List<Term>) objval;
}
}
? (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 string); } }
- public bool IsName { get { return (objval is Name); } }
+ 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); } }
- public Term Eval (Domain domain)
+ internal Term Eval (Domain domain)
{
- if (objval == null || objval is Name || objval is string)
+ if (objval == null || objval is Symbol || objval is Str
+ || objval is List<Term>)
return this;
- if (objval is List<Term>)
- return new Term ((List<Term>) objval);
- if (objval is Funcall)
- return ((Funcall) 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);
+ 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 static explicit operator int (Term term)
+ public Term Clone ()
{
- if (term.objval != null)
- throw new Exception ("Not an integer term: " + term);
- return term.intval;
+ 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 explicit operator Name (Term term)
+ 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)
{
- return (Name) term.objval;
+ 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 static implicit operator Term (int i)
+ public override int GetHashCode () { return intval; }
+
+ public bool Matches (Term term)
{
- return new Term (i);
+ 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 ()
+ 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 Name)
+ else if (objval is Symbol)
str = "<symbol>" + objval + "</symbol>";
- else if (objval is string)
+ else if (objval is Str)
str = "<string>" + objval + "</string>";
else if (objval is List<Term>)
{
- str = "<list>";
- foreach (Term e in (List<Term>) objval)
- str += e;
- str += "</list>";
+ if (detail)
+ {
+ str = "<list>";
+ foreach (Term e in (List<Term>) objval)
+ str += e;
+ str += "</list>";
+ }
+ else
+ str = "<list/>";
}
- else if (objval is Funcall)
- str = "<funcall fname=\"" + ((Funcall) objval).func.name + "\"/>";
- else if (objval is Variable)
- str = "<variable vname=\"" + ((Variable) objval).name + "\"/>";
else if (objval is Term)
str = "<quote>" + objval + "</quote>";
else
- throw new Exception ("invalid Term object: " + objval);
+ str = ((TermValue) objval).ToString (detail);
return str;
}
}
- 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");
+ 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");
- internal static int parse_integer (string str)
+ private static int parse_integer (XmlNode node)
{
+ string str = node.InnerText;
int len = str.Length;
- bool negative = false;
+ int i, c;
- if (len <= 1)
- return (len == 0 ? 0 : str[0] - '0');
+ if (len == 2 && str[0] == '?')
+ return str[1];
+ if (len > 2
+ && str[1] == 'x' && ((c = str[0]) == '0' || c == '#'))
+ {
+ 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;
+ }
- int c = str[0];
- int 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 (c == '0' && str[1] == 'x')
+ 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
+ throw new Error (Error.TermTypeInvalid, "Unknown type: {0}", type);
+ }
+ else
{
- i = 0;
- for (int idx = 2; idx < len; idx++)
+ 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)
{
- 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');
+ 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
- break;
+ throw new Error (Error.WrongType, n,
+ "Not fixed, optional, nor rest: {0}", n.Name);
}
- return i;
+ 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;
}
- if (c == '-')
- negative = true;
- i = c - '0';
- for (int idx = 1; idx < len; idx++)
+ else
{
- c = str[idx];
- if (c < '0' || c > '9')
- break;
- i = i * 10 + (c - '0');
+ min_args = max_args = 0;
+ args = new Variable[0];
}
- return negative ? - i : i;
+ return args;
+ }
+
+ public 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;
+ }
+
+ public 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");
+ }
}
- private Term[] terms;
+ private static bool default_stop (XmlNode n) { return n == null; }
- public Xexpression (string url, Domain domain)
+ public delegate bool ParseStop (XmlNode node);
+
+ public static Term[] Parse (Domain domain, XmlNode node, ParseStop stop)
{
- XmlDocument doc = new XmlDocument (Name.Table);
+ if (stop == null)
+ stop = default_stop;
+
+ XmlNode n;
+ for (n = node; ! stop (n); 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 = node;
+ throw e;
+ } catch (Exception e) {
+ throw new Error (Error.UnknownError, node, e, "Parsing error");
+ }
+ }
+
+ List<Term> terms = new List<Term> ();
+ for (; node != n; node = node.NextSibling)
+ if (node.NodeType == XmlNodeType.Element)
+ {
+ try {
+ if (node.Name == Qdefun || node.Name == Qdefmacro)
+ parse_defun_body (domain, node);
+ else if (node.Name == Qdefvar)
+ parse_defvar (domain, node);
+ else
+ terms.Add (Parse (domain, node));
+ } catch (Error e) {
+ if (e.Node == null)
+ e.Node = node;
+ throw e;
+ } catch (Exception e) {
+ throw new Error (Error.UnknownError, node, 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, Name.Table))
+ 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 != Nexpr));
+ || reader.Name != Qexpr));
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)
- if (n.NodeType == XmlNodeType.Element)
- {
- if (n.Name == Ndefun)
- domain.RegisterFunction (n);
- else if (n.Name == Ndefvar)
- domain.Defvar (n);
- else
- nterms++;
- }
-
- terms = new Term[nterms];
- int i = 0;
- for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling)
- if (n.NodeType == XmlNodeType.Element)
- {
- if (n.Name == Ndefun)
- domain.Defun (n);
- else if (n.Name != Ndefvar)
- terms[i++]= new Term (n, domain);
- }
+ return Parse (domain, node.FirstChild, null);
}
- public Term Eval (Domain domain)
+ public static Term Eval (Domain domain, Term term)
{
- Term result = Zero;
-
- domain.depth = 0;
- foreach (Term term in terms)
- result = term.Eval (domain);
- return result;
+ return Eval (domain, new Term[] { term });
}
- public override string ToString ()
+ public static Term Eval (Domain domain, Term[] terms)
{
- string str = "";
- for (int i = 0; i < terms.Length; i++)
- str += terms[i];
- return str;
+ 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");
+ }
}
}
}
projects / m17n / m17n-lib-cs.git / blobdiff