using System.Collections;
using System.Collections.Generic;
using System.IO;
+using System.Reflection;
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 static partial class Error
+ {
+ // Load time errors.
+ public static Symbol UnknownFunction = "unknown-function";
+ public static Symbol TypeConflict = "type-conflict";
+ public static Symbol AlreadyDefined = "already-defined";
+ public static Symbol WrongCallingFormat = "wrong-calling-format";
+ public static Symbol ArgumentMismatch = "argument-mismatch";
+
+ // Run time errors.
+ public static Symbol ArithmeticError = "arithmetic-error";
+ public static Symbol WrongType = "wrong-type";
+ public static Symbol WrongRange = "wrong-range";
+ public static Symbol OutOfRange = "out-of-range";
+
+ public static Symbol InvalidVariableType = "invalid variable type";
+ public static Symbol NoOuterLoop = "no outer loop";
+ public static Symbol UnknownError = "unknown error";
+ }
+
+ public class Exception : System.Exception
+ {
+ public Symbol ErrorName;
+ public string ErrorNode;
+ public Term ErrorTerm;
+
+ internal Exception (Symbol name, string fmt, params object[] args)
+ : this (name, Zero, fmt, args) { }
+
+ internal Exception (Symbol name, XmlNode node,
+ string fmt, params object[] args)
+ : this (name, node, Zero, fmt, args) { }
+
+ internal Exception (Symbol name, Term term,
+ string fmt, params object[] args)
+ : this (name, null, term, fmt, args) { }
+
+ internal Exception (Symbol name, XmlNode node, Term term,
+ string fmt, params object[] args)
+ : base (String.Format (message, args))
+ {
+ ErrorName = name;
+ if (node != null)
+ ErrorNode = node.OuterXml;
+ ErrorTerm = term;
+ }
+
+ internal Exception (XmlNode node, System.Exception e)
+ : base ("System error", e)
+ {
+ ErrorName = Qsystem_error;
+ ErrorNode = node;
+ ErrorTerm = Zero;
+ }
}
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";
+ private static Symbol Qename = "ename";
+
public abstract class Function
{
public Symbol name;
- public int min_arg, max_arg;
+ // 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 Function () { }
- public Function (Symbol name, int min_arg, int max_arg)
+ public Function (Symbol name, bool with_var, int min_args, int max_args)
{
this.name = name;
- this.min_arg = min_arg;
- this.max_arg = max_arg;
+ 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);
internal class Subroutine : Function
{
- public Builtin builtin;
- public bool setvar;
+ public Func<Domain, Variable, Term[], Term> builtin;
- public Subroutine (Builtin builtin, Symbol name, bool setvar,
- int min_arg, int max_arg)
- : base (name, min_arg, max_arg)
+ public Subroutine (Func<Domain, Variable, Term[], Term> builtin,
+ Symbol name, bool with_var,
+ int min_args, int max_args)
+ : base (name, with_var, min_args, max_args)
{
this.builtin = builtin;
- this.setvar = setvar;
}
public override Term Call (Domain domain, Variable vari, Term[] args)
{
- if (args != null)
+ 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)
+ if (domain.Thrown ())
return args[i];
}
}
internal class SpecialForm : Function
{
- public Builtin builtin;
+ public Func<Domain, Variable, Term[], Term> builtin;
- public SpecialForm (Builtin builtin, Symbol name,
- int min_arg, int max_arg)
- : base (name, min_arg, max_arg)
+ public SpecialForm (Func<Domain, Variable, Term[], Term> builtin,
+ Symbol name, bool with_var,
+ int min_args, int max_args)
+ : base (name, with_var, min_args, max_args)
{
this.builtin = builtin;
}
}
}
- 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 class Lambda : Function
{
- internal Variable[] args;
- internal Term[] body;
+ private Variable[] args;
+ private Term[] body;
- public Macro (Domain domain, XmlNode node)
+ public Lambda (Symbol name, int min_args, int max_args, Variable[] args,
+ Term[] body)
+ : base (name, false, min_args, max_args)
{
- parse_head (domain, node, out name, out min_arg, out max_arg,
- out args);
+ this.args = args;
+ this.body = body;
}
- public void SetBody (Domain domain, XmlNode node)
+ public void SetBody (Term[] body)
{
- parse_body (domain, node, out 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 < 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 ();
+ 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[result].Listval);
+
+ for (int i = 0; i < list.Count; i++)
+ {
+ result = list[i].Eval (domain);
+ if (domain.Thrown)
+ return result;
+ list[i] = result;
}
- }
- } finally {
- domain.UnboundTo (current);
- }
+ domain.Bind (this.args[limit], new Term (list));
+ }
+ domain.Catch (CatchTag.Return);
+ foreach (Term term in body)
+ {
+ result = term.Eval (domain);
+ if (domain.Thrown ())
+ return result;
+ }
+ domain.Uncatch ();
+ domain.UnboundTo (current);
return result;
}
}
- internal class Lambda : Function
+ internal class Macro : 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);
- }
+ private Variable[] args;
+ private Term[] body;
- public Lambda (Domain domain, Symbol name, Symbol[] args)
+ public Macro (Symbol name, int min_args, int max_args, Variable[] args,
+ Term[] body)
+ : base (name, false, min_args, max_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;
- }
+ this.args = args;
+ this.body = body;
}
- public void SetBody (Domain domain, XmlNode node)
- {
- parse_body (domain, node, out body);
- }
-
public void SetBody (Term[] body)
{
this.body = body;
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);
- }
+ for (int i = 0; i < args.Length; i++)
+ domain.Bind (this.args[i], args[i]);
+ domain.Catch (CatchTag.Return);
+ foreach (Term term in body)
+ {
+ result = term.Eval (domain);
+ if (domain.Thrown ())
+ break;
+ }
+ domain.Uncatch ();
+ domain.UnboundTo (current);
return result;
}
}
public virtual void Reset () { val = Zero; }
- public virtual string Description { get { return null; } }
-
public Term Value
{
get { return val; }
public override void Reset () { val = default_val; }
- public override string Description { get { return desc; } }
+ public string Description {
+ get { return desc; }
+ set { desc = value; }
+ }
}
public class Int : Typed
: 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 Exception (Qinvalid_range,
+ "Range length for {0} not even", name);
this.range = range;
if (! ValueP (val))
- throw_exception ("Invalid integer value for {0}: {1}", name, val);
+ throw new Exception (Qout_of_range,
+ "Invalid integer value for {0}: {1}",
+ name, val);
}
public override bool ValueP (Term term)
{
this.range = range;
if (! ValueP (val))
- throw_exception ("Invalid string value for {0}: {1}", name, val);
+ throw new Exception (Qout_of_range,
+ "Invalid string value for {0}: {1}",
+ name, val);
}
public override bool ValueP (Term term)
{
this.range = range;
if (! ValueP (val))
- throw_exception ("Invalid symbol value for {0}: {1}", name, val);
+ throw new Exception (Qout_of_range,
+ "Invalid symbol value for {0}: {1}",
+ name, val);
}
public override bool ValueP (Term term)
}
}
- private static void throw_exception (string msg)
- {
- throw new Exception (msg);
- }
-
- private static void throw_exception (string fmt, params object[] args)
+ internal struct CatchTag
{
- throw new Exception (String.Format (fmt, args));
- }
+ private Term tag;
- internal class CatchTag : IEquatable<CatchTag>
- {
- private object val;
+ public CatchTag (Symbol sym) { tag = new Term (sym); }
+ public CatchTag (Symbol sym, string msg) { tag = new Term (sym, msg); }
+ public CatchTag (ErrorTerm e) { tag = new Term (e); }
+ private CatchTag (int i) { tag = new Term (i); }
- public CatchTag (Symbol sym) { val = (string) sym; }
- private CatchTag (int i) { val = i; }
+ public Term Tag { get { return tag; } }
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, Function.Macro> macros
+ = new Dictionary<Symbol, Function.Macro> ();
internal Dictionary<Symbol, Variable> variables
= new Dictionary<Symbol, Variable> ();
internal Bindings bindings;
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);
+ macros = new Dictionary<Symbol, Function.Macro> (parent.macros);
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 ();
+ }
+
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 ()
+ internal bool ThrowBreak ()
{
- if (catch_stack.Peek () != CatchTag.Break)
- throw_exception ("No outer loop to break");
+ if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
+ return false;
catch_count--;
+ return true;
}
- internal void ThrowTag (CatchTag tag)
+ internal void ThrowSymbol (Term tag)
{
foreach (CatchTag elt in catch_stack)
{
catch_count--;
- if (elt == tag)
+ if (elt.Tag.Matches (tag))
break;
}
}
- public void DefTerm (Symbol name, TermParser parser)
+ internal Term ThrowError (Term tag)
{
- if (termtypes.ContainsKey (name)
- || functions.ContainsKey (name))
- throw new Exception ("already defined: " + name);
- termtypes[name] = new TermType (name, parser);
+ tag = tag.Clone ();
+ ErrorTerm e = tag.objval as ErrorTerm;
+ e.CallStack = call_stack.ToArray ();
+
+ foreach (CatchTag elt in catch_stack)
+ {
+ catch_count--;
+ if (elt.Tag.Matches (tag))
+ break;
+ }
+ return tag;
}
- 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 (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;
+ if (! type.IsSubclassOf (typeof (TermValue)))
+ throw new Exception ("Not a subclass of TermValue: " + type);
+ BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic;
+ FieldInfo finfo = type.GetField ("name", flags);
+ if (finfo == null || finfo.FieldType != typeof (Symbol))
+ throw new Exception ("No \"name\" field of string type: " + type);
+ Symbol name = (Symbol) finfo.GetValue (null);
+ if (termtypes.ContainsKey (name)
+ || functions.ContainsKey (name)
+ || macros.ContainsKey (name))
+ throw new Exception ("already defined: " + name);
+ Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) };
+ MethodInfo minfo = type.GetMethod ("Parser", types);
+ if (minfo == null || minfo.ReturnType != typeof (TermValue))
+ throw new Exception ("No \"Parser\" method of correct type: " + type);
+ termtypes[name] = minfo;
}
- public void DefSpecial (Builtin builtin, string str,
- int min_arg, int max_arg,
- params string[] aliases)
+ static void check_func_head (Symbol name, bool with_var,
+ int min_args, int max_args)
{
- 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 Exception (Qtype_conflict, "{0} is a Term type", name);
+ else if (macros.ContainsKey (name))
+ throw new Exception (Qtype_conflict, "{0} is a macro", name);
+
+ Function func;
+ if (functions.TryGetValue (name, out func)
+ && (func.with_var != with_var
+ || func.min_args != min_args
+ || func.max_args != max_args))
+ throw new Exception (Qargument_mismatch, "");
}
- public void DefAlias (string alias, string str)
+ public void DefSubr (Func<Domain, Variable, Term[], Term> 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);
+ 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 (Func<Domain, Variable, Term[], Term> 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);
+ 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_arg, int max_arg,
+ 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);
+ 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_arg, int max_arg,
+ Variable[] args, Term[] body)
{
- Symbol name = node.Attributes[Qfname].Value;
if (termtypes.ContainsKey (name))
- throw new Exception ("already defined as termtype: " + name);
- Function func;
+ throw new Exception (Qtype_conflict, "{0} is a Term type", name);
+ else if (function.ContainsKey (name))
+ throw new Exception (Qtype_conflict, "{0} is a function", name);
- if (prototype || ! functions.TryGetValue (name, out func))
- {
- func = new Function.Macro (this, node);
- functions[name] = func;
- }
- if (! prototype)
- ((Function.Macro) func).SetBody (this, node);
+ Function.Macro macro;
+ if (macros.TryGetValue (name, out macro)
+ && (macro.min_args != min_args
+ || macro.max_args != max_args))
+ throw new Exception (Qargument_mismatch, "");
+
+ macros[name] = new Function.Macro (name, min_arg, max_arg, args, body);
+ }
+
+ public void DefAlias (Symbol alias, Symbol fname)
+ {
+ Function func;
+ if (functions.TryGetValue (alias, out func))
+ throw new Exception (Qalready_defined,
+ "Alread defined: {0}", alias);
+ if (! functions.TryGetValue (fname, out func))
+ throw new Exception (Qunknown_function,
+ "Unknown fucntion: {0}", fname);
+ functions[alias] = func;
}
public Variable Defvar (XmlNode node)
Symbol type = node.Name;
XmlNodeList range_list = null;
int nranges = 0;
- string val = node.InnerText;
+ XmlNode n = node.NextSibling;
- node = node.NextSibling;
- if (node != null)
+ if (n != null)
{
- range_list = node.ChildNodes;
+ range_list = n.ChildNodes;
nranges = range_list.Count;
}
if (type == Qinteger)
{
- int n = parse_integer (val);
+ int val = parse_integer (node);
int[] range = null;
if (range_list != null)
{
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);
+ 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.InnerText);
+ range[i * 2] = range[i * 2 + 1]
+ = parse_integer (nd.FirstChild);
}
}
}
- vari = DefvarInt (name, n, desc, range);
+ vari = DefvarInt (name, val, desc, range);
}
else if (type == Qstring)
{
for (int i = 0; i < nranges; i++)
range[i] = range_list[i].FirstChild.InnerText;
}
- vari = DefvarStr (name, val, desc, range);
+ vari = DefvarStr (name, node.InnerText, desc, range);
}
else if (type == Qsymbol)
{
for (int i = 0; i < nranges; i++)
range[i] = range_list[i].FirstChild.InnerText;
}
- vari = DefvarSym (name, (Symbol) val, desc, range);
+ vari = DefvarSym (name, (Symbol) node.InnerText, desc, range);
}
else
- throw new Exception ("Unknown type: " + type);
+ Exception.Throw (Qparse_error, node, "Unknown type: {0}", type);
}
else
{
vari = new Variable (this, name, Zero);
variables[name] = vari;
}
- Console.WriteLine (vari);
return vari;
}
Variable.Int intvari = vari as Variable.Int;
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;
+ if (range != null)
+ {
+ if (! intvari.IsSubrange (range))
+ throw new Exception ("Variable range mismatch: " + name);
+ intvari.Range = range;;
+ }
+ if (desc != null)
+ intvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.Int (this, name, n, desc, range);
+ variables[name] = vari;
}
- vari = new Variable.Int (this, name, n, desc, range);
- variables[name] = vari;
return vari;
}
Variable.Str strvari = vari as Variable.Str;
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;
+ if (range != null)
+ {
+ if (! strvari.IsSubrange (range))
+ throw new Exception ("Variable range mismatch: " + name);
+ strvari.Range = range;
+ }
+ if (desc != null)
+ strvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.Str (this, name, str, desc, range);
+ variables[name] = vari;
}
- vari = new Variable.Str (this, name, str, desc, range);
- variables[name] = vari;
return vari;
}
Variable.Sym symvari = vari as Variable.Sym;
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;
+ if (range != null)
+ {
+ if (! symvari.IsSubrange (range))
+ throw new Exception ("Variable range mismatch: " + name);
+ symvari.Range = range;
+ }
+ if (desc != null)
+ symvari.Description = desc;
+ }
+ else
+ {
+ vari = new Variable.Sym (this, name, sym, desc, range);
+ variables[name] = vari;
}
- vari = new Variable.Sym (this, name, sym, desc, range);
- variables[name] = vari;
return vari;
}
Function func;
if (! functions.TryGetValue (name, out func))
- throw new Exception ("Unknown function: " + name);
+ throw new Exception (Qunknown_function, (strign) name);
return func;
}
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);
}
}
}
}
- 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)
{
+ if (vari == null)
+ return new Term (new ErrorTerm (Error.NoVariable, ""));
vari.Value = args[0];
return args[0];
}
result = ((List<Term>) args[1].objval)[args[0].Intval];
}
else
- throw new Exception ("Term is not enumelable: " + args[1]);
+ throw new Exception (Qwrong_type,
+ "{0} is not a string nor a list", args[1]);
return result;
}
private static Term Fins (Domain domain, Variable vari, Term[] args)
{
+ if (vari == null)
+ throw new Exception (Qwrong_calling_format, "No vname attribute");
Term term = vari.Value;
-
if (term.IsStr)
{
string str = term.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 Exception (Qwrong_type, "{0} is not a string nor list",
+ vari.Value);
return vari.Value;
}
private static Term Fdel (Domain domain, Variable vari, Term[] args)
{
+ if (vari == null)
+ throw new Exception (Qwrong_calling_format, "No vname attribute");
if (vari.Value.IsStr)
{
string str
vari.Value.Listval.RemoveRange (args[0].Intval,
args[1].Intval - args[0].Intval);
else
- throw new Exception ("term is not collection: " + vari.Value);
+ throw new Exception (Qwrong_type, "{0} is not a string nor a list",
+ vari.Value);
return vari.Value;
}
private static Term Fbreak (Domain domain, Variable vari, Term[] args)
{
- domain.ThrowBreak ();
+ if (! domain.ThrowBreak ())
+ return domain.ThrowError (new Term (Error.NoOuterLoop, null));
return args.Length == 0 ? Zero : args[0];
}
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 < args.Length; i++)
+ {
+ result = args[i].Eval (domain);
+ if (domain.Thrown (out caught))
+ break;
+ }
return result;
}
- public static Term Fthrow (Domain domain, Variable vari, Term[] args)
+ public static Term Fcatch (Domain domain, Variable vari, Term[] args)
{
- domain.ThrowTag (new CatchTag (args[0].Symval));
- return (args.Length == 1 ? Zero : args[1]);
- }
+ Term result;
+ bool caught = false;
- public delegate TermValue TermParser (Domain domain, XmlNode node);
+ if (args.Length < 2)
+ throw new Exception (Error.WrongCallingFormat,
+ "too fee arguments: {0}", args.Length);
+ if (args[0].IsError)
+ {
+ int count = domain.CallStackCount;
- public class TermType
- {
- public readonly Symbol type;
- internal readonly TermParser parser;
+ try {
+ result = evaluate_terms (domain, args, 1, out caught);
+ } catch (Exception e) {
+ if (! args[0].Matches (e.ErrorTerm))
+ throw e;
+ ((ErrorTerm) e.ErrorTerm.objval).
+ if (vari != null)
+ vari.Value = e.ErrorTerm;
+ domain.CallStackPop (count);
+ return One;
+ }
+ }
+ else if (args[0].IsSymbol)
+ {
+ domain.Catch (new CatchTag (args[0].Symval));
+ result = evaluate_terms (domain, args, 1, out caught);
+ domain.Uncatch ();
+ }
+ if (vari != null)
+ vari.Value = result;
+ return Zero;
+ }
- public TermType (Symbol type, TermParser parser)
- {
- this.type = type;
- this.parser = parser;
- }
+ 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)
+ return domain.ThrowError (args[0]);
+ return domain.ThrowError (new Term (Error.InvalidArgumentType,
+ args[0].ToString ()));
}
public abstract class TermValue
{
- public virtual Term Eval (Domain domain) { return new Term (this); }
+ public virtual Term Eval (Domain domain) { return 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 abstract string ToString (bool detail);
}
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.GetVar (vname, true);
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 "<varref vname=\"" + name + "\"/>";
+ 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; } }
+
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}: ",
+ int nargs = args.Length;
+
+ if (nargs < func.min_args
+ || (func.max_args >= 0 && nargs > func.max_args))
+ throw new Exception (Qwrong_calling_format,
+ "Wrong number of arguments to {0}: {1}",
func.name, nargs);
- }
+ if (! func.with_var && vari != null)
+ throw new Exception (Qwrong_calling_format,
+ "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.GetVar (attr.Value, true);
+ XmlNodeList nlist = node.ChildNodes;
+ int nargs = nlist.Count;
+ Term[] args = new Term[nargs];
+ for (int i = 0; i < nargs; i++)
+ args[i] = new Term (domain, nlist[i]);
+ return new Funcall (func, vari, args);
+ }
public override Term Eval (Domain domain)
{
- domain.DebugWrite (true, ToString ());
+ domain.TraceWrite (ToString ());
domain.depth++;
Term result = func.Call (domain, vari, args);
domain.depth--;
- domain.DebugWrite (true, " ==> {0}", result.ToString ());
+ 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)
+ 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;
+ private string message;
+ private Term[] stack;
+
+ public ErrorTerm (Symbol ename, string message)
+ {
+ this.ename = ename;
+ this.message = 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; } set { stack = value; } }
+
+ public override TermValue Clone ()
+ {
+ return new ErrorTerm (ename, message);
+ }
+
+ public override bool Equals (object obj)
+ {
+ ErrorTerm e = obj as ErrorTerm;
+ if (e == null || e.ename != ename || e.message != message
+ || (e.stack == null ? stack != null
+ : (stack == null || e.stack.Length != stack.Length)))
+ return false;
+ if (stack != null)
+ for (int i = 0; i < stack.Length; i++)
+ if (! stack[i].Equals (e.stack[i]))
+ return false;
+ return true;
+ }
+
+ 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 struct Term
{
public int intval;
public Term (string str) { intval = 0; objval = 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 (Term term) { intval = term.intval; objval = term.objval; }
public Term (TermValue obj) { intval = 0; objval = obj; }
public Term (Domain domain, XmlNode node)
if (name == Qinteger)
{
- intval = parse_integer (node.InnerText);
+ intval = parse_integer (node);
objval = null;
}
else
}
else
{
- TermType term_type;
+ MethodInfo minfo;
- if (domain.termtypes.TryGetValue (name, out term_type))
- objval = term_type.parser (domain, node);
+ if (domain.termtypes.TryGetValue (name, out minfo))
+ objval = (TermValue) minfo.Invoke (null, new Object[] { domain, node});
else
{
- Funcall funcall = (Funcall) Funcall.parser (domain, node);
+ Funcall funcall = (Funcall) Funcall.Parser (domain, node);
if (funcall.func is Function.Macro)
{
Term result = funcall.Eval (domain);
public object Objval {
get {
if (objval == null)
- throw new Exception ("term is an integer: " + this);
+ throw new Exception (Qwrong_type,
+ "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 Exception (Qwrong_type, "{0} is not an integer", this);
return intval;
}
}
public string Strval {
get {
if (! IsStr)
- throw new Exception ("term is not string: " + this);
+ throw new Exception (Qwrong_type, "{0} is not a string", this);
return (string) objval;
}
}
public string Symval {
get {
if (! IsSymbol)
- throw new Exception ("term is not symbol: " + this);
+ throw new Exception (Qwrong_type, "{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 Exception (Qwrong_type, "{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 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)
+ private Term Eval (Domain domain)
{
- if (objval == null || objval is Symbol || objval is string)
+ if (objval == null || objval is Symbol || objval is string
+ || objval is List<Term>)
return this;
- if (objval is List<Term>)
- return new Term ((List<Term>) objval);
- return ((TermValue) objval).Eval (domain);
+ domain.CallStackPush (this);
+ Term result = ((TermValue) objval).Eval (domain);
+ domain.CallStackPop ();
+ return result;
}
public Term Clone ()
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 (IsStr)
+ return term.IsStr && term.Strval == Strval;
+ if (IsSymbol)
+ return term.IsSymbol && term.Symval == Symval;
+ 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 && term.Intval == Intval;
+ if (IsStr)
+ return term.IsStr && term.Strval == Strval;
+ if (IsSymbol)
+ return term.IsSymbol && term.Symval == Symval;
+ 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 = "<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)
{
+ str = node.InnerText;
int len = str.Length;
bool negative = false;
+ int i, c;
+
+ if (len == 1 && str[0] == '?')
+ return str[1];
+ if (len > 2
+ && str[1] == 'x' && ((c = str[0]) == '0' || c == '#'))
+ {
+ if (! int.TryParse (str.SubString (2), NumberStyles.HexNumber, null,
+ out i))
+ Exception.Throw (Qparse_error, node, "Invalid integer");
+ return i;
+ }
+ if (! int.TryParse (str, out i))
+ Exception.Throw (Qparse_error, node, "Invalid integer");
+ return i;
+ }
+
+ static bool parse_error (XmlNode node, out Term term)
+ {
+ try {
+ term = new Term (node.OuterXml);
+ } catch {
+ term = memory_error;
+ }
+ return false;
+ }
- if (len <= 1)
- return (len == 0 ? 0 : str[0] - '0');
+ static bool parse_error (XmlNode node, out Term[] terms)
+ {
+ try {
+ terms = new Term[] { new Term (node.OuterXml) };
+ } catch {
+ terms = new Term[] { memory_error };
+ }
+ return false;
+ }
- int c = str[0];
- int i;
+ 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;
- if (c == '?')
- return str[1];
- if ((c == '0' || c == '#') && str[1] == 'x')
+ node = node.FirstChild;
+ if (node != null && node.Name == Qargs)
{
- i = 0;
- for (int idx = 2; idx < len; idx++)
+ 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 += n.ChildNodes.Count;
+ else if (n.Name == Qoptional)
+ noptional += n.ChildNodes.Count;
+ else if (n.Name == Qrest)
+ nrest++;
else
- break;
+ throw new Exception (Qinvalid_argument_type, n);
}
- 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)
+ {
+ for (XmlNode nn = n.FirstChild; nn != null; nn = nn.NextSibling)
+ args[i++] = domain.Defvar ((Symbol) nn.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;
}
- private Term[] terms;
+ public static Symbol parse_defun_head (Domain domain, XmlNode node)
+ {
+ Symbol name = node.Attributes[Qfname].Value;
+ int min_args, max_args;
+ Variable[] args;
+
+ try {
+ args = parse_head (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);
+ } catch (Exception e) {
+ if (e.ErrorNode == null)
+ e.ErrorNode = node;
+ throw e;
+ } catch (System.Exception e) {
+ throw new Exception (node, e);
+ }
+ return name;
+ }
- public static Term[] ParseTerms (Domain domain, XmlNode node)
+ public static void parse_defun_body (Domain domain, XmlNode node)
{
- int nterms = 0;
- for (XmlNode n = node; n != null; n = n.NextSibling)
- if (n.NodeType == XmlNodeType.Element)
- {
- 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++;
- }
- Term[] terms = new Term[nterms];
- int i = 0;
- for (XmlNode n = node; n != null; n = n.NextSibling)
- if (n.NodeType == XmlNodeType.Element)
- {
- if (n.Name == Qdefun)
- domain.Defun (n, false);
- else if (n.Name == Qdefmacro)
- domain.Defmacro (n, false);
- else if (n.Name != Qdefvar)
- terms[i++]= new Term (domain, n);
- }
- return terms;
+ 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;
+ Term[] body = Parse (domain, node, null);
+ if (node.Name == Qdefun)
+ ((Function.Lambda) func).SetBody (body);
+ else
+ ((Function.Macro) func).SetBody (body);
}
- public static Term Eval (Domain domain, Term[] terms)
+ public static Term Parse (Domain domain, XmlNode node)
{
- Term result = new Term (0);
- foreach (Term term in terms)
+ Symbol name = node.Name;
+
+ 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)
{
- result = term;
- if (result.Objval is Funcall)
- while ((result = result.Eval (domain)).Objval is Funcall);
+ List<Term> list = new List<Term> ();
+ for (node = node.FirstChild; node != null;
+ node = node.NextSibling)
+ list.Add (Parse (domain, node));
+ return new Term (list);
}
- return result;
+ 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 minfo;
+ if (domain.termtypes.TryGetValue (name, out minfo))
+ {
+ object[] arg = new object[] { domain, node };
+ return new Term ((TermValue) minfo.Invoke (null, arg));
+ }
+
+ Funcall funcall = (Funcall) Funcall.Parser (domain, node);
+ if (funcall.func is Function.Macro)
+ return funcall.Eval (domain);
+ return new Term (funcall);
}
+ private static bool default_stop (XmlNode n) { return n == null; }
- public Xexpression (Domain domain, XmlNode node)
+ public static List<Term> Parse (Domain domain, XmlNode node,
+ Func<XmlNode, bool> 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))
+ parse_defun_head (domain, n);
+
+ List<Term> terms = new List<Term> ();
+ for (; node != n; node = node.NextSibling)
+ if (node.NodeType == XmlNodeType.Element)
+ {
+ 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));
+ }
+ return terms;
}
- public Xexpression (Domain domain, string url)
+ public static List<Term> Parse (Domain domain, string url)
{
XmlDocument doc = new XmlDocument (Symbol.NameTable);
XmlNode node;
throw new Exception ("Node <expr> not found");
node = doc.ReadNode (reader);
}
- terms = ParseTerms (domain, node.FirstChild);
+ return Parse (domain, node.FirstChild, null);
}
- public Term Eval (Domain domain)
+ public static Term Eval (Domain domain, List<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)
- return result;
- }
- } finally {
- domain.Uncatch ();
- }
+ foreach (Term term in terms)
+ {
+ result = term.Eval (domain);
+ if (domain.Thrown)
+ return result;
+ }
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