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
{
- public class Xexpression
+ public static class Xexpression
{
- private static int debug_depth = 0;
+ private static int trace_depth = 0;
- public static int DebugDepth {
- get { return debug_depth; }
- set { debug_depth = value; }
+ public static int TraceDepth {
+ get { return trace_depth; }
+ set { trace_depth = value; }
+ }
+
+ public class Error : Exception
+ {
+ private readonly Symbol name;
+ private Term[] stack;
+ private XmlNode node;
+
+ 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 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 ()
+ {
+ 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;
+ }
+
+ // 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>
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 ()
private static Symbol Qdescription = "description";
private static Symbol Qrange = "range";
- public abstract class Function
- {
- public Symbol name;
- public int min_arg, max_arg;
-
- public Function () { }
-
- public Function (Symbol name, int min_arg, int max_arg)
- {
- this.name = name;
- this.min_arg = min_arg;
- this.max_arg = max_arg;
- }
-
- public abstract Term Call (Domain domain, Variable vari, Term[] args);
-
- public override string ToString ()
- {
- return name;
- }
-
- internal class Subroutine : Function
- {
- public Builtin builtin;
- public bool setvar;
-
- public Subroutine (Builtin builtin, Symbol name, bool setvar,
- int min_arg, int max_arg)
- : base (name, min_arg, max_arg)
- {
- this.builtin = builtin;
- this.setvar = setvar;
- }
-
- public override Term Call (Domain domain, Variable vari, Term[] args)
- {
- if (args != null)
- {
- 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);
- }
- }
-
- internal class SpecialForm : Function
- {
- public Builtin builtin;
-
- public SpecialForm (Builtin builtin, Symbol name,
- int min_arg, int max_arg)
- : base (name, min_arg, max_arg)
- {
- this.builtin = builtin;
- }
-
- public override Term Call (Domain domain, Variable vari, Term[] args)
- {
- return builtin (domain, vari, args);
- }
- }
-
- private static void parse_head (Domain domain, XmlNode node,
- out Symbol name,
- out int min_arg, out int max_arg,
- out Variable[] args)
- {
- int nfixed = 0;
- int noptional = 0;
- int nrest = 0;
- name = node.Attributes[Qfname].Value;
-
- node = node.FirstChild;
- if (node != null && node.Name == Qargs)
- {
- XmlNode n;
- for (n = node.FirstChild; n != null; n = n.NextSibling)
- {
- if (n.Name == Qfixed)
- nfixed++;
- else if (n.Name == Qoptional)
- noptional++;
- else if (n.Name == Qrest)
- nrest++;
- else
- throw new Exception ("Invalid argument type: " + n);
- }
- min_arg = nfixed;
- max_arg = nfixed + noptional + nrest;
- args = new Variable[max_arg];
- n = node.FirstChild;
- for (int i = 0; i < max_arg; n = n.NextSibling)
- args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value);
- if (nrest == 1)
- max_arg = - max_arg;
- }
- else
- {
- min_arg = max_arg = 0;
- args = null;
- }
- }
-
- private static void parse_body (Domain domain, XmlNode node,
- out Term[] body)
- {
- for (node = node.FirstChild; node != null; node = node.NextSibling)
- if (node.Name != Qdescription
- && node.Name != Qargs)
- break;
- int nterms = 0;
- for (XmlNode n = node; n != null; n = n.NextSibling)
- nterms++;
- if (nterms > 0)
- {
- body = new Term[nterms];
- for (nterms = 0; node != null; node = node.NextSibling, nterms++)
- body[nterms] = new Term (domain, node);
- }
- else
- body = null;
- }
-
- internal class Macro : Function
- {
- internal Variable[] args;
- internal Term[] body;
-
- public Macro (Domain domain, XmlNode node)
- {
- parse_head (domain, node, out name, out min_arg, out max_arg,
- out args);
- }
-
- public void SetBody (Domain domain, XmlNode node)
- {
- parse_body (domain, node, out body);
- }
-
- public override Term Call (Domain domain, Variable vari, Term[] args)
- {
- Bindings current = domain.bindings;
- Term result = Zero;
-
- try {
- for (int i = 0; i < min_arg; i++)
- domain.Bind (this.args[i], args[i]);
- if (body != null)
- {
- try {
- domain.Catch (CatchTag.Return);
- foreach (Term term in body)
- {
- result = term.Eval (domain);
- if (domain.Thrown)
- return result;
- }
- } finally {
- domain.Uncatch ();
- }
- }
- } finally {
- domain.UnboundTo (current);
- }
- return result;
- }
- }
-
- internal class Lambda : Function
- {
- internal Variable[] args;
- internal Term[] body;
-
- public Lambda (Domain domain, XmlNode node)
- {
- parse_head (domain, node, out name, out min_arg, out max_arg,
- out args);
- }
-
- public Lambda (Domain domain, Symbol name, Symbol[] args)
- {
- int nfixed = 0;
- int noptional = 0;
- int nrest = 0;
-
- this.name = name;
- if (args != null)
- {
- int i = 0;
- for (i = 0; i < args.Length; i++, nfixed++)
- if (args[i] == Qoptional || args[i] == Qrest)
- break;
- if (i < args.Length)
- {
- if (args[i] == Qoptional)
- {
- for (i++; i < args.Length; i++, noptional++)
- if (args[i] == Qrest)
- break;
- if (i < args.Length)
- nrest = 1;
- }
- }
- min_arg = nfixed;
- max_arg = nfixed + noptional + nrest;
- this.args = new Variable[max_arg];
- int j;
- for (i = j = 0; j < this.args.Length; i++)
- if (args[i] != Qoptional || args[i] != Qrest)
- this.args[j++] = domain.Defvar (args[i]);
- }
- else
- {
- min_arg = max_arg = 0;
- }
- }
-
- public void SetBody (Domain domain, XmlNode node)
- {
- parse_body (domain, node, out body);
- }
-
- 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 {
- int i;
- if (args != null)
- {
- Term[] newargs = new Term[args.Length];
- for (i = 0; i < min_arg; i++)
- newargs[i] = args[i].Eval (domain);
- args = newargs;
- }
- for (i = 0; i < min_arg; i++)
- domain.Bind (this.args[i], args[i]);
- if (body != null)
- {
- try {
- domain.Catch (CatchTag.Return);
- foreach (Term term in body)
- {
- result = term.Eval (domain);
- if (domain.Thrown)
- return result;
- }
- } finally {
- domain.Uncatch ();
- }
- }
- } finally {
- domain.UnboundTo (current);
- }
- return result;
- }
- }
- }
+ private static Symbol Qename = "ename";
public class Variable
{
this.val = val;
}
- public virtual bool ValueP (Term val) { return true; }
+ public Term Value { get { return val; } }
+
+ public virtual Term SetValue (Term val) { this.val = val; return val; }
public virtual Variable Clone (Domain domain)
{
public virtual void Reset () { val = Zero; }
- public virtual string Description { get { return null; } }
-
- public Term Value
- {
- get { return val; }
- set {
- if (! ValueP (value))
- throw new Exception ("Invalid value: " + value);
- val = value;
- }
- }
-
- public Term SetValue (int i)
- {
- val.intval = i;
- val.objval = null;
- return val;
- }
-
- public Term SetValue (string s)
- {
- val.objval = s;
- return val;
- }
-
public override string ToString () { return name + "(" + val + ")"; }
public abstract class Typed : Variable
public override void Reset () { val = default_val; }
- public override string Description { get { return desc; } }
+ 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 class Int : Typed
+ public class IntType : Typed
{
private int[] range;
return true;
}
- public Int (Domain domain, Symbol name, int n, string desc, int[] range)
+ 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_exception ("Range length for {0} not even", name);
+ throw new Error (Error.VariableWrongRange,
+ "Range length for {0} not even", name);
this.range = range;
- if (! ValueP (val))
- throw_exception ("Invalid integer value for {0}: {1}", name, val);
+ CheckValue (val);
}
- public override bool ValueP (Term term)
+ public override bool CheckValue (Term term)
{
- if (! term.IsInt)
- return false;
- 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 (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 Int (domain, name, val.Intval, desc, range);
+ return new IntType (domain, name, val.Intval, desc, range);
}
public int[] Range { get { return range; } set { range = value; } }
}
- public class Str : Typed
+ public class StrType : Typed
{
private string[] range;
return true;
}
- public Str (Domain domain, Symbol name, string str, string desc,
- string[] range)
+ public StrType (Domain domain, Symbol name, Str str, string desc,
+ string[] range)
: base (domain, name, new Term (str), desc)
{
this.range = range;
- if (! ValueP (val))
- throw_exception ("Invalid string value for {0}: {1}", name, val);
+ CheckValue (val);
}
- public override bool ValueP (Term term)
+ public override bool CheckValue (Term val)
{
- if (! term.IsStr)
- return false;
- if (range == null)
- return true;
- string str = term.Strval;
- foreach (string s in range)
- if (str == s)
+ if (val.IsStr)
+ {
+ if (range == null)
+ return true;
+ Str str = val.Strval;
+ foreach (string s in range)
+ if (str.Equals (s))
+ return true;
+ }
+ return false;
+ }
+
+ 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 class SymType : Typed
+ {
+ public Symbol[] range;
+
+ 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)
+ {
+ 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 Str (domain, name, val.Strval, desc, range);
+ return new SymType (domain, name, val.Symval, desc, range);
+ }
+
+ public Symbol[] Range { get { return range; } set { range = value; } }
+ }
+ }
+
+ public abstract class Function
+ {
+ 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)
+ {
+ this.name = name;
+ 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;
+ }
+
+ internal class Subroutine : Function
+ {
+ 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)
+ {
+ 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);
+ }
+ }
+
+ 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 override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ return builtin (domain, vari, args);
+ }
+ }
+
+ internal class Lambda : Function
+ {
+ private Variable[] args;
+ private Term[] body;
+
+ 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 void SetBody (Term[] body)
+ {
+ this.body = body;
+ }
+
+ 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;
+
+ 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;
}
-
- public string[] Range { get { return range; } set { range = value; } }
}
- public class Sym : Typed
+ internal class Macro : Function
{
- public Symbol[] range;
-
- 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;
- }
+ private Variable[] args;
+ private Term[] body;
- public Sym (Domain domain, Symbol name, Symbol sym, string desc,
- Symbol[] range)
- : base (domain, name, new Term (sym), desc)
+ public Macro (Symbol name, int min_args, int max_args, Variable[] args,
+ Term[] body)
+ : base (name, false, min_args, max_args)
{
- this.range = range;
- if (! ValueP (val))
- throw_exception ("Invalid symbol value for {0}: {1}", name, val);
+ this.args = args;
+ this.body = body;
}
- public override bool ValueP (Term term)
+ public void SetBody (Term[] body)
{
- if (! term.IsSymbol)
- return false;
- if (range == null)
- return true;
- Symbol name = term.Symval;
- foreach (Symbol n in range)
- if (name == n)
- return true;
- return false;
+ this.body = body;
}
- public override Variable Clone (Domain domain)
+ public override Term Call (Domain domain, Variable vari, Term[] args)
{
- return new Sym (domain, name, val.Symval, desc, range);
- }
+ Bindings current = domain.bindings;
+ Term result = Zero;
- public Symbol[] Range { get { return range; } set { range = value; } }
+ 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;
+ }
}
}
{
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.Value = b.old_value;
+ b.vari.SetValue (b.old_value);
return boundary;
}
}
}
- private static void throw_exception (string msg)
- {
- throw new Exception (msg);
- }
-
- private static void throw_exception (string fmt, params object[] args)
- {
- throw new Exception (String.Format (fmt, args));
- }
-
- internal class CatchTag : IEquatable<CatchTag>
+ internal struct CatchTag
{
- private object val;
+ private Term tag;
+ public Term Tag { get { return tag; } }
- public CatchTag (Symbol sym) { val = (string) sym; }
- private CatchTag (int i) { val = i; }
+ // 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 static bool operator== (CatchTag t1, CatchTag t2)
- { return t1.val == t2.val; }
-
- public static bool operator!= (CatchTag t1, CatchTag t2)
- { return t1.val != t2.val; }
-
- public bool Equals (CatchTag tag) { return this.val == tag.val; }
- public override bool Equals (object val) { return this.val == val; }
-
- public override int GetHashCode () { return val.GetHashCode (); }
}
public class Domain
public Symbol name;
public object context;
public int depth = 0;
+ private Stack<Term> call_stack = new Stack<Term> ();
- internal Dictionary<Symbol, TermType> termtypes
- = new Dictionary<Symbol, TermType> ();
+ internal Dictionary<Symbol, MethodInfo> termtypes
+ = new Dictionary<Symbol, MethodInfo> ();
internal Dictionary<Symbol, Function> functions
= new Dictionary<Symbol, Function> ();
internal Dictionary<Symbol, Variable> variables
public Domain (Symbol name, Domain parent, object context) : this (name)
{
- termtypes = new Dictionary<Symbol, TermType> (parent.termtypes);
+ 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 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)
+ {
+ 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);
catch_count--;
}
- public bool Thrown {
- get { return catch_count < catch_stack.Count; }
+ 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 ()
{
- foreach (CatchTag tag in catch_stack)
+ foreach (CatchTag elt in catch_stack)
{
catch_count--;
- if (tag == CatchTag.Return)
+ if (elt.Tag == CatchTag.Return.Tag)
break;
}
}
internal void ThrowBreak ()
{
- if (catch_stack.Peek () != CatchTag.Break)
- throw_exception ("No outer loop to break");
+ if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
+ throw new Error (Error.NoLoopToBreak,
+ "No surrounding loop to break");
catch_count--;
}
- internal void ThrowTag (CatchTag tag)
+ internal void ThrowSymbol (Term tag)
{
+ int i = catch_count;
foreach (CatchTag elt in catch_stack)
{
- catch_count--;
- if (elt == tag)
- break;
+ i--;
+ if (elt.Tag.Matches (tag))
+ {
+ catch_count = i;
+ return;
+ }
}
+ throw new Error (Error.UncaughtThrow,
+ "No corresponding catch: {0}", tag);
}
- public void DefTerm (Symbol name, TermParser parser)
- {
- if (termtypes.ContainsKey (name)
- || functions.ContainsKey (name))
- throw new Exception ("already defined: " + name);
- termtypes[name] = new TermType (name, parser);
- }
-
- public void DefSubr (Builtin builtin, string str, bool setvar,
- int min_arg, int max_arg, params string[] aliases)
+ public void DefType (Type type)
{
- Symbol name = str;
+ 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 Exception ("already defined as termtype: " + name);
- Function func = new Function.Subroutine (builtin, name, setvar,
- min_arg, max_arg);
- functions[name] = func;
- foreach (string a in aliases)
- functions[(Symbol) a] = func;
- }
-
- public void DefSpecial (Builtin builtin, string str,
- int min_arg, int max_arg,
- params string[] aliases)
+ 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)
{
- Symbol name = str;
if (termtypes.ContainsKey (name))
- throw new Exception ("already defined as termtype: " + name);
- Function func = new Function.SpecialForm (builtin, name,
- min_arg, max_arg);
- functions[name] = func;
- foreach (string a in aliases)
- functions[(Symbol) a] = func;
+ 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 DefAlias (string alias, string str)
+ public void DefSubr (Function.Builtin builtin, Symbol name,
+ bool with_var, int min_args, int max_args)
{
- functions[(Symbol) alias] = functions[(Symbol) str];
+ 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 Defun (Symbol name, Symbol[] args, Term[] body,
- bool prototype)
+ public void DefSpecial (Function.Builtin builtin, Symbol name,
+ bool with_var, int min_args, int max_args)
{
- Function func;
-
- if (termtypes.ContainsKey (name))
- throw new Exception ("already defined as termtype: " + name);
- if (prototype || ! functions.TryGetValue (name, out func))
- {
- func = new Function.Lambda (this, name, args);
- functions[name] = func;
- }
- if (! prototype)
- ((Function.Lambda) func).SetBody (body);
+ 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 Defun (XmlNode node, bool prototype)
+ public void Defun (Symbol name, int min_args, int max_args,
+ Variable[] args, Term[] body)
{
- Symbol name = node.Attributes[Qfname].Value;
- if (termtypes.ContainsKey (name))
- throw new Exception ("already defined as termtype: " + name);
- Function func;
-
- if (prototype || ! functions.TryGetValue (name, out func))
- {
- func = new Function.Lambda (this, node);
- functions[name] = func;
- }
- if (! prototype)
- ((Function.Lambda) func).SetBody (this, node);
+ check_func_head (name, false, min_args, max_args, false);
+ functions[name] = new Function.Lambda (name, min_args, max_args,
+ args, body);
}
public void Defun (Function func)
functions[func.name] = func;
}
- public void Defmacro (XmlNode node, bool prototype)
+ public void Defmacro (Symbol name, int min_args, int max_args,
+ Variable[] args, Term[] body)
{
- Symbol name = node.Attributes[Qfname].Value;
- if (termtypes.ContainsKey (name))
- throw new Exception ("already defined as termtype: " + name);
- Function func;
-
- if (prototype || ! functions.TryGetValue (name, out func))
- {
- func = new Function.Macro (this, node);
- functions[name] = func;
- }
- if (! prototype)
- ((Function.Macro) func).SetBody (this, node);
+ check_func_head (name, false, min_args, max_args, true);
+ functions[name] = new Function.Macro (name, min_args, max_args,
+ args, body);
}
- public Variable Defvar (XmlNode node)
+ public void DefAlias (Symbol alias, Symbol fname)
{
- Symbol name = node.Attributes[0].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;
- string val = node.InnerText;
-
- node = node.NextSibling;
- if (node != null)
- {
- range_list = node.ChildNodes;
- nranges = range_list.Count;
- }
-
- if (type == Qinteger)
- {
- int n = parse_integer (val);
- int[] range = null;
- if (range_list != null)
- {
- range = new int[nranges * 2];
- for (int i = 0; i < nranges; i++)
- {
- XmlNode nd = range_list[i];
- if (nd.Name == Qrange)
- {
- range[i * 2]
- = parse_integer (nd.FirstChild.InnerText);
- range[i * 2 + 1]
- = parse_integer (nd.LastChild.InnerText);
- }
- else
- {
- range[i * 2]
- = range[i * 2 + 1]
- = parse_integer (nd.FirstChild.InnerText);
- }
- }
- }
- vari = DefvarInt (name, n, 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 = DefvarStr (name, val, 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 = DefvarSym (name, (Symbol) val, desc, range);
- }
- else
- throw new Exception ("Unknown type: " + type);
- }
- else
- {
- if (variables.TryGetValue (name, out vari))
- vari = vari.Clone (this);
- else
- vari = new Variable (this, name, Zero);
- variables[name] = vari;
- }
- Console.WriteLine (vari);
- return vari;
+ 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 Variable Defvar (Variable vari)
internal Variable Defvar (Symbol name)
{
- Variable vari = new Variable (this, name, Zero);
- variables[name] = vari;
+ Variable vari;
+
+ 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;
}
if (variables.TryGetValue (name, out vari))
{
- Variable.Int intvari = vari as Variable.Int;
+ Variable.IntType intvari = vari as Variable.IntType;
if (intvari == null)
- throw new Exception ("Variable type mismatch: " + name);
- if (range == null)
- range = intvari.Range;
- else if (! intvari.IsSubrange (range))
- throw new Exception ("Variable range mismatch: " + name);
- if (desc == null)
- desc = vari.Description;
+ 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;
}
- vari = new Variable.Int (this, name, n, desc, range);
- variables[name] = vari;
return vari;
}
if (variables.TryGetValue (name, out vari))
{
- Variable.Str strvari = vari as Variable.Str;
+ Variable.StrType strvari = vari as Variable.StrType;
if (strvari == null)
- throw new Exception ("Variable type mismatch: " + name);
- if (range == null)
- range = strvari.Range;
- else if (! strvari.IsSubrange (range))
- throw new Exception ("Variable range mismatch: " + name);
- if (desc == null)
- desc = vari.Description;
+ 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;
}
- vari = new Variable.Str (this, name, str, desc, range);
- variables[name] = vari;
return vari;
}
if (variables.TryGetValue (name, out vari))
{
- Variable.Sym symvari = vari as Variable.Sym;
+ Variable.SymType symvari = vari as Variable.SymType;
if (symvari == null)
- throw new Exception ("Variable type mismatch: " + name);
- if (range == null)
- range = symvari.Range;
- else if (! symvari.IsSubrange (range))
- throw new Exception ("Variable range mismatch: " + name);
- if (desc == null)
- desc = vari.Description;
+ 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;
}
- vari = new Variable.Sym (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 Exception ("Unknown function: " + name);
+ throw new Error (Error.UnknownFunction,
+ "Unknown function: {0}", name);
return func;
}
domain.functions[kv.Key] = kv.Value;
}
- public Variable GetVar (Symbol name, bool create)
+ public Variable GetVarCreate (Symbol name)
{
Variable vari;
if (! variables.TryGetValue (name, out vari))
- {
- if (! create)
- return null;
- variables[name] = vari = new Variable (this, name, Zero);
- }
+ 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;
}
return str;
}
- internal void DebugWrite (bool head, string fmt, params string[] arg)
+ internal void TraceWrite (string fmt, params string[] arg)
{
- if (debug_depth > 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);
}
}
{
foreach (KeyValuePair<Variable,Term> kv
in (Dictionary<Variable,Term>) values)
- kv.Key.Value = kv.Value;
+ kv.Key.SetValue (kv.Value);
}
}
- public delegate Term Builtin (Domain domain, Variable vari, Term[] args);
-
private static Domain basic = new Domain ("basic");
static Xexpression ()
{
- basic.DefTerm ("funcall", Funcall.parser);
- basic.DefTerm ("varref", Varref.parser);
-
- basic.DefSubr (Fset, "set", true, 1, 1, "=");
- basic.DefSubr (Fnot, "not", false, 1, 1, "!");
- basic.DefSubr (Fadd, "add", true, 1, -1, "+");
- basic.DefSubr (Fmul, "mul", true, 1, -1, "*");
- basic.DefSubr (Fsub, "sub", true, 1, -1, "-");
- basic.DefSubr (Fdiv, "div", true, 1, -1, "/");
- basic.DefSubr (Fmod, "mod", true, 1, 2, "%");
- basic.DefSubr (Flogior, "logior", true, 1, -1, "|");
- basic.DefSubr (Flogand, "logand", true, 1, -1, "&");
- basic.DefSubr (Flsh, "lsh", true, 1, 2, "<<");
- basic.DefSubr (Frsh, "rsh", true, 1, 2, ">>");
- basic.DefSubr (Feq, "eq", false, 2, -1, "==");
- basic.DefSubr (Fnoteq, "noteq", false, 2, 2, "!=");
- basic.DefSubr (Flt, "lt", false, 2, -1, "<");
- basic.DefSubr (Fle, "le", false, 2, -1, "<=");
- basic.DefSubr (Fgt, "gt", false, 2, -1, ">");
- basic.DefSubr (Fge, "ge", false, 2, -1, ">=");
+ 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 (Feval, "eval", false, 1, 1);
basic.DefSubr (Fbreak, "break", false, 0, 1);
basic.DefSubr (Freturn, "return", false, 0, 1);
-
- basic.DefSpecial (Fand, "and", 1, -1, "&&");
- basic.DefSpecial (For, "or", 1, -1, "||");
- basic.DefSpecial (Fprogn, "progn", 0, -1, "expr");
- basic.DefSpecial (Fif, "if", 2, 3);
- basic.DefSpecial (Fwhen, "when", 1, -1);
- basic.DefSpecial (Floop, "loop", 1, -1);
- basic.DefSpecial (Fwhile, "while", 1, -1);
- basic.DefSpecial (Fcond, "cond", 1, -1);
- basic.DefSpecial (Fforeach, "foreach", 2, -1);
- basic.DefSpecial (Fquote, "quote", 1, 1);
- basic.DefSpecial (Ftype, "type", 1, 1);
- basic.DefSpecial (Fcatch, "catch", 2, 2);
- basic.DefSpecial (Fthrow, "throw", 1, 2);
+ 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)
{
- vari.Value = args[0];
+ if (vari == null)
+ throw new Error (Error.NoVariableName, "No variable name to set");
+ vari.SetValue (args[0]);
return args[0];
}
return args[0].IsTrue ? Zero : One;
}
+ 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.Value.Intval;
foreach (Term arg in args)
n += arg.Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Fmul (Domain domain, Variable vari, Term[] args)
int n = vari == null ? 1 : vari.Value.Intval;
foreach (Term arg in args)
n *= arg.Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Fsub (Domain domain, Variable vari, Term[] args)
}
while (i < args.Length)
n -= args[i++].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Fdiv (Domain domain, Variable vari, Term[] args)
}
while (i < args.Length)
n /= args[i++].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Fmod (Domain domain, Variable vari, Term[] args)
{
- int n = args[0].Intval % args[1].Intval;
-
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, args[0].Intval % args[1].Intval);
}
private static Term Flogior (Domain domain, Variable vari, Term[] args)
int n = vari == null ? 0 : vari.Value.Intval;
foreach (Term arg in args)
n |= arg.Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Flogand (Domain domain, Variable vari, Term[] args)
}
while (i < args.Length)
n &= args[i++].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Flsh (Domain domain, Variable vari, Term[] args)
{
- int n = args[0].Intval << args[1].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, args[0].Intval << args[1].Intval);
}
private static Term Frsh (Domain domain, Variable vari, Term[] args)
{
- int n = args[0].Intval >> args[1].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval);
}
private static Term Feq (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.Value.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 term;
- term.intval = 0;
- term.objval = str;
- return term;
+ str.Insert (-1, (char) arg.Intval);
}
- return vari.SetValue (str);
+ return vari == null ? new Term (str) : vari.Value;
}
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 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 Fins (Domain domain, Variable vari, Term[] args)
{
- Term term = vari.Value;
-
- if (term.IsStr)
- {
- string str = term.Strval.Insert (args[0].Intval, args[1].Strval);
- vari.SetValue (str);
- }
+ 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.Value);
+ throw new Error (Error.WrongType, "Not a string nor a list: {0}",
+ vari.Value);
return vari.Value;
}
private static Term Fdel (Domain domain, Variable vari, Term[] args)
{
+ if (vari == null)
+ throw new Error (Error.NoVariableName, "No variable name to set");
if (vari.Value.IsStr)
- {
- string str
- = vari.Value.Strval.Remove (args[0].Intval,
- args[1].Intval - args[0].Intval);
- vari.SetValue (str);
- }
+ 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);
+ args[1].Intval - args[0].Intval);
else
- throw new Exception ("term is not collection: " + vari.Value);
+ throw new Error (Error.WrongType, "Not a string nor a list: {0}",
+ vari.Value);
return vari.Value;
}
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 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;
}
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 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;
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;
}
Term result = Zero;
try {
domain.Catch (CatchTag.Break);
- while (! domain.Thrown)
+ while (! domain.Thrown ())
foreach (Term arg in args)
{
result = arg.Eval (domain);
- if (domain.Thrown)
+ if (domain.Thrown ())
return result;
}
} finally {
Term result = Zero;
try {
domain.Catch (CatchTag.Break);
- while (! domain.Thrown && args[0].Eval (domain).IsTrue)
+ while (! domain.Thrown () && args[0].Eval (domain).IsTrue)
for (int i = 1; i < args.Length; i++)
{
result = args[i].Eval (domain);
- if (domain.Thrown)
+ if (domain.Thrown ())
return result;
}
} finally {
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 Fforeach (Domain domain, Variable vari,
- Term[] args)
+ private static Term Fforeach (Domain domain, Variable vari, Term[] args)
{
Term result = args[0].Eval (domain);
- if (domain.Thrown)
+ if (domain.Thrown ())
return result;
List<Term> list = result.Listval;
Bindings current = domain.bindings;
for (int i = 1; i < args.Length; i++)
{
result = args[i].Eval (domain);
- if (domain.Thrown)
+ if (domain.Thrown ())
return result;
}
} finally {
private static Term Fquote (Domain domain, Variable vari, Term[] args)
{
- return new Term (args[0]);
+ return args[0];
}
private static Term Ftype (Domain domain, Variable vari, Term[] args)
return TermTerm;
}
- public static Term Fcatch (Domain domain, Variable vari, Term[] args)
+ private static Term eval_terms (Domain domain, Term[] terms, int idx,
+ out bool caught)
{
- Term result = Zero;
- try {
- domain.Catch (new CatchTag (args[0].Symval));
- result = args[1].Eval (domain);
- } finally {
- domain.Uncatch ();
- }
+ Term result= Zero;
+
+ 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 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)
+ {
+ 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)
{
- domain.ThrowTag (new CatchTag (args[0].Symval));
- return (args.Length == 1 ? Zero : args[1]);
- }
-
- public delegate TermValue TermParser (Domain domain, XmlNode node);
-
- public class TermType
- {
- public readonly Symbol type;
- internal readonly TermParser parser;
-
- public TermType (Symbol type, TermParser parser)
- {
- this.type = type;
- this.parser = parser;
- }
+ 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 Symbol name;
+ private static Symbol name = "varref";
+ public static Symbol Name { get { return name; } }
+
+ private Symbol vname;
private Variable vari;
- public Varref (Symbol name) { this.name = name; }
+ public Varref (Symbol vname) { this.vname = vname; }
public override Term Eval (Domain domain)
{
if (vari == null || vari.domain != domain)
- vari = domain.GetVar (name, true);
+ vari = domain.GetVarCreate (vname);
return vari.Value;
}
- internal static TermValue parser (Domain domain, XmlNode node)
+ public static TermValue Parser (Domain domain, XmlNode node)
{
return new Varref ((Symbol) node.Attributes[Qvname].Value);
}
- public override string ToString ()
+ 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=\"" + name + "\"/>";
+ 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)
- {
- int nargs = args.Length;
- if (nargs < func.min_arg
- || (func.max_arg >= 0 && nargs > func.max_arg))
- throw_exception ("Invalid number of arguments to {0}: ",
- func.name, nargs);
- }
+ 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;
}
- internal static TermValue parser (Domain domain, XmlNode node)
- {
- Symbol fname = node.Name;
- XmlAttribute attr;
+ public static TermValue Parser (Domain domain, XmlNode node)
+ {
+ Symbol fname = node.Name;
+ XmlAttribute attr;
- if (fname == Qfuncall)
- fname = node.Attributes[Qfname].Value;
- Function func = domain.GetFunc (fname);
- Variable vari;
- attr = node.Attributes[Qvname];
- vari = attr == null ? null : domain.GetVar (attr.Value, true);
- XmlNodeList nlist = node.ChildNodes;
- int nargs = nlist.Count;
- Term[] args = new Term[nargs];
- for (int i = 0; i < nargs; i++)
- args[i] = new Term (domain, nlist[i]);
- return new Funcall (func, vari, args);
- }
+ 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)
{
- domain.DebugWrite (true, ToString ());
- domain.depth++;
- Term result = func.Call (domain, vari, args);
- domain.depth--;
- domain.DebugWrite (true, " ==> {0}", result.ToString ());
+ Term result;
+ domain.TraceWrite (ToString ());
+ try {
+ domain.depth++;
+ result = func.Call (domain, vari, args);
+ } finally {
+ domain.depth--;
+ }
+ domain.TraceWrite ("=> {0}", result.ToString ());
return result;
}
return new Funcall (func, vari, args);
}
- public override string ToString ()
+ 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 (args == 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)
- str += String.Format ("({0})...", args.Length);
+ {
+ for (int i = 0; i < args.Length; i++)
+ str += ".";
+ }
else
foreach (Term e in args)
str += e;
}
}
+ 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;
// <symbol>...</symbol>
public Term (Symbol name) { intval = 0; objval = name; }
// <string>...</string>
- public Term (string str) { intval = 0; objval = str; }
+ public Term (string str) { intval = 0; objval = new Str (str); }
// <list>...</list>
public Term (List<Term> list) { intval = 0; objval = list; }
-
- public Term (Term term) { intval = term.intval; objval = term.objval; }
- public Term (TermValue obj) { intval = 0; objval = obj; }
-
- public Term (Domain domain, XmlNode node)
+ // <error ename="ERROR-NAME">ERROR-MESSASGE</error>
+ public Term (Symbol name, string message)
{
- Symbol name = node.Name;
-
- if (name == Qinteger)
- {
- intval = parse_integer (node.InnerText);
- objval = null;
- }
- else
- {
- intval = 0;
- if (name == Qsymbol)
- objval = (Symbol) node.InnerText;
- else if (name == Qstring)
- objval = node.InnerText.Clone ();
- else if (name == Qlist)
- {
- List<Term> list = new List<Term> ();
- for (node = node.FirstChild; node != null;
- node = node.NextSibling)
- list.Add (new Term (domain, node));
- objval = list;
- }
- else
- {
- TermType term_type;
-
- if (domain.termtypes.TryGetValue (name, out term_type))
- objval = term_type.parser (domain, node);
- else
- {
- Funcall funcall = (Funcall) Funcall.parser (domain, node);
- if (funcall.func is Function.Macro)
- {
- Term result = funcall.Eval (domain);
- intval = result.intval;
- objval = result.objval;
- }
- else
- objval = funcall;
- }
- }
- }
+ 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;
Function func = domain.GetFunc (fname);
- Variable vari = vname == Qnull ? null : domain.GetVar (vname, true);
+ Variable vari = vname == Qnull ? null : domain.GetVarCreate(vname);
Funcall funcall = new Funcall (func, vari, args);
if (func is Function.Macro)
{
public object Objval {
get {
if (objval == null)
- throw new Exception ("term is an integer: " + this);
+ 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 Exception ("term is not symbol: " + this);
+ 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 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 bool IsType (Type type)
- {
- return (objval == null ? type == typeof (int)
- : type == objval.GetType ());
- }
-
- public Term Eval (Domain domain)
+ internal Term Eval (Domain domain)
{
- if (objval == null || objval is Symbol || 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);
- return ((TermValue) objval).Eval (domain);
+ 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 || objval is string)
+ 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> ();
return new Term (((TermValue) objval).Clone ());
}
- public override string ToString ()
+ 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;
str = "<integer>" + intval + "</integer>";
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 Term)
str = "<quote>" + objval + "</quote>";
- else if (objval is TermValue)
- str = ((TermValue) objval).ToString ();
else
- throw new Exception ("invalid Term object: " + objval);
+ str = ((TermValue) objval).ToString (detail);
return str;
}
}
- static private Term Zero = new Term (0);
- static private Term One = new Term (1);
- static private Term TermInt = new Term (Qinteger);
- static private Term TermStr = new Term (Qstring);
- static private Term TermSymbol = new Term (Qsymbol);
- static private Term TermList = new Term (Qlist);
- static private Term TermTerm = new Term ((Symbol) "term");
+ 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;
+ }
+
+ 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;
- int c = str[0];
- int i;
+ if (n != null)
+ {
+ range_list = n.ChildNodes;
+ nranges = range_list.Count;
+ }
- if (c == '?')
- return str[1];
- if ((c == '0' || c == '#') && str[1] == 'x')
+ 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;
}
- private Term[] terms;
+ 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[] ParseTerms (Domain domain, XmlNode node)
+ public static Term Parse (Domain domain, XmlNode node)
{
- int nterms = 0;
- for (XmlNode n = node; n != null; n = n.NextSibling)
- if (n.NodeType == XmlNodeType.Element)
+ 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)
{
- if (n.Name == Qdefun)
- domain.Defun (n, true);
- else if (n.Name == Qdefmacro)
- domain.Defmacro (n, true);
- else if (n.Name == Qdefvar)
- domain.Defvar (n);
- else
- nterms++;
+ List<Term> list = new List<Term> ();
+ for (node = node.FirstChild; node != null;
+ node = node.NextSibling)
+ list.Add (Parse (domain, node));
+ return new Term (list);
}
- Term[] terms = new Term[nterms];
- int i = 0;
- for (XmlNode n = node; n != null; n = n.NextSibling)
- if (n.NodeType == XmlNodeType.Element)
+ if (name == Qdefun || name == Qdefmacro)
{
- if (n.Name == Qdefun)
- domain.Defun (n, false);
- else if (n.Name == Qdefmacro)
- domain.Defmacro (n, false);
- else if (n.Name != Qdefvar)
- terms[i++]= new Term (domain, n);
+ 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));
}
- return terms;
- }
- public static Term Eval (Domain domain, Term[] terms)
- {
- Term result = new Term (0);
- foreach (Term term in terms)
- {
- result = term;
- if (result.Objval is Funcall)
- while ((result = result.Eval (domain)).Objval is Funcall);
- }
- return result;
+ 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 static bool default_stop (XmlNode n) { return n == null; }
+
+ public delegate bool ParseStop (XmlNode node);
- public Xexpression (Domain domain, XmlNode node)
+ public static Term[] Parse (Domain domain, XmlNode node, ParseStop stop)
{
- terms = ParseTerms (domain, node);
+ 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 Xexpression (Domain domain, string url)
+ public static Term[] Parse (Domain domain, string url)
{
XmlDocument doc = new XmlDocument (Symbol.NameTable);
XmlNode node;
- using (XmlTextReader reader = new XmlTextReader (url, doc.NameTable))
+ using (XmlTextReader reader = new XmlTextReader (url, Symbol.NameTable))
{
+ reader.WhitespaceHandling = WhitespaceHandling.None;
do {
reader.Read ();
} while (reader.NodeType != XmlNodeType.None
throw new Exception ("Node <expr> not found");
node = doc.ReadNode (reader);
}
- terms = ParseTerms (domain, node.FirstChild);
+ return Parse (domain, node.FirstChild, null);
+ }
+
+ public static Term Eval (Domain domain, Term term)
+ {
+ return Eval (domain, new Term[] { term });
}
- public Term Eval (Domain domain)
+ public static Term Eval (Domain domain, Term[] terms)
{
Term result = Zero;
- domain.depth = 0;
try {
- domain.Catch (CatchTag.Return);
foreach (Term term in terms)
{
result = term.Eval (domain);
- if (domain.Thrown)
+ if (domain.Thrown ())
return result;
}
- } finally {
- domain.Uncatch ();
+ return result;
+ } catch (Error e) {
+ throw e;
+ } catch (Exception e) {
+ throw new Error (Error.UnknownError, null, e, "Runtime error");
}
- return result;
- }
-
- public override string ToString ()
- {
- string str = "";
- for (int i = 0; i < terms.Length; i++)
- str += terms[i];
- return str;
}
}
}
projects / m17n / m17n-lib-cs.git / blobdiff