# HG changeset patch
# User Jaroslav Hajek <highegg@gmail.com>
# Date 1248255701 -7200
# Node ID c5f03874ea2a2b2d3ad8d04e0d7ac88dbd139bc8
# Parent  0c785ad961fa7921c667b1e7ca6c3a0f4cb7e78f
simplify symbol_table::find and associated functions

diff -r 0c785ad961fa -r c5f03874ea2a src/ChangeLog
--- a/src/ChangeLog	Tue Jul 21 12:43:33 2009 -0400
+++ b/src/ChangeLog	Wed Jul 22 11:41:41 2009 +0200
@@ -1,3 +1,18 @@
+2009-07-22  Jaroslav Hajek  <highegg@gmail.com>
+
+	* symtab.cc (symbol_table::find, 
+	symbol_table::find_function, 
+	symbol_table::symbol_record::find,
+	symbol_table::fcn_info::find,
+	symbol_table::fcn_info::fcn_info_rep::find,
+	symbol_table::fcn_info::fcn_info_rep::xfind): Simplify argument lists.
+	* symtab.h: Update declarations.
+	* pt-id.cc (tree_identifier::rvalue): Simplify.
+	* pt-id.h (tree_identifier::do_lookup): Simplify.
+	* pt-idx.cc (tree_index_expression::rvalue): Update.
+	* variables.cc (symbol_exist): Update.
+
+
 2009-07-21  John W. Eaton  <jwe@octave.org>
 
 	* symtab.cc (symbol_table::builtin_find,
diff -r 0c785ad961fa -r c5f03874ea2a src/pt-id.cc
--- a/src/pt-id.cc	Tue Jul 21 12:43:33 2009 -0400
+++ b/src/pt-id.cc	Wed Jul 22 11:41:41 2009 +0200
@@ -60,11 +60,7 @@
   if (error_state)
     return retval;
 
-  octave_value_list evaluated_args;
-  bool args_evaluated = false;
-
-  octave_value val = xsym().find (0, string_vector (), evaluated_args,
-				  args_evaluated);
+  octave_value val = xsym ().find ();
 
   if (val.is_defined ())
     {
diff -r 0c785ad961fa -r c5f03874ea2a src/pt-id.h
--- a/src/pt-id.h	Tue Jul 21 12:43:33 2009 -0400
+++ b/src/pt-id.h	Wed Jul 22 11:41:41 2009 +0200
@@ -84,10 +84,9 @@
   //     then .mex files, then .m files.
 
   octave_value
-  do_lookup (tree_argument_list *args, const string_vector& arg_names,
-	     octave_value_list& evaluated_args, bool& args_evaluated)
+  do_lookup (const octave_value_list& args = octave_value_list ())
   {
-    return xsym().find (args, arg_names, evaluated_args, args_evaluated);
+    return xsym().find (args);
   }
 
   void mark_global (void) { xsym().mark_global (); }
diff -r 0c785ad961fa -r c5f03874ea2a src/pt-idx.cc
--- a/src/pt-idx.cc	Tue Jul 21 12:43:33 2009 -0400
+++ b/src/pt-idx.cc	Wed Jul 22 11:41:41 2009 +0200
@@ -296,8 +296,12 @@
 	  if (n > 0)
 	    {
 	      string_vector anm = *(arg_nm.begin ());
+              have_args = true;
+              first_args = al -> convert_to_const_vector ();
+              first_args.stash_name_tags (anm);
 
-	      first_expr_val = id->do_lookup  (al, anm, first_args, have_args);
+              if (! error_state)
+                first_expr_val = id->do_lookup  (first_args);
 	    }
 	}
     }
diff -r 0c785ad961fa -r c5f03874ea2a src/symtab.cc
--- a/src/symtab.cc	Tue Jul 21 12:43:33 2009 -0400
+++ b/src/symtab.cc	Wed Jul 22 11:41:41 2009 +0200
@@ -96,10 +96,7 @@
 }
 
 octave_value
-symbol_table::symbol_record::find (tree_argument_list *args,
-				   const string_vector& arg_names,
-				   octave_value_list& evaluated_args,
-				   bool& args_evaluated) const
+symbol_table::symbol_record::find (const octave_value_list& args) const
 {
   octave_value retval;
 
@@ -113,12 +110,10 @@
         {
           // Use cached fcn_info pointer if possible.
           if (rep->finfo)
-            retval = rep->finfo->find (args, arg_names,
-                                       evaluated_args, args_evaluated);
+            retval = rep->finfo->find (args);
           else
             { 
-              retval = symbol_table::find_function (name (), args, arg_names,
-                                                    evaluated_args, args_evaluated);
+              retval = symbol_table::find_function (name (), args);
 
               if (retval.is_defined ())
                 rep->finfo = get_fcn_info (name ());
@@ -429,11 +424,11 @@
 }
 
 static std::string
-get_dispatch_type (const octave_value_list& evaluated_args)
+get_dispatch_type (const octave_value_list& args)
 {
   std::string dispatch_type;
 
-  int n = evaluated_args.length ();
+  int n = args.length ();
 
   if (n > 0)
     {
@@ -443,7 +438,7 @@
 
       for (i = 0; i < n; i++)
 	{
-	  octave_value arg = evaluated_args(i);
+	  octave_value arg = args(i);
 
 	  if (arg.is_object ())
 	    {
@@ -454,7 +449,7 @@
 
       for (int j = i+1; j < n; j++)
 	{
-	  octave_value arg = evaluated_args(j);
+	  octave_value arg = args(j);
 
 	  if (arg.is_object ())
 	    {
@@ -472,7 +467,7 @@
 	{
 	  // No object found, so use class of first argument.
 
-	  dispatch_type = evaluated_args(0).class_name ();
+	  dispatch_type = args(0).class_name ();
 	}
     }
 
@@ -493,30 +488,10 @@
 //   function on the path
 //   built-in function
 
-// Notes:
-//
-// FIXME -- we need to evaluate the argument list to determine the
-// dispatch type.  The method used here works (pass in the args, pass
-// out the evaluated args and a flag saying whether the evaluation was
-// needed), but it seems a bit inelegant.  We do need to save the
-// evaluated args in some way to avoid evaluating them multiple times.
-//  Maybe evaluated args could be attached to the tree_argument_list
-// object?  Then the argument list could be evaluated outside of this
-// function and we could elimnate the arg_names, evaluated_args, and
-// args_evaluated arguments.  We would still want to avoid computing
-// the dispatch type unless it is needed, so the args should be passed
-// rather than the dispatch type.  But the arguments will need to be
-// evaluated no matter what, so evaluating them beforehand should be
-// OK.  If the evaluated arguments are attached to args, then we would
-// need to determine the appropriate place(s) to clear them (for
-// example, before returning from tree_index_expression::rvalue).
-
 octave_value
-symbol_table::fcn_info::fcn_info_rep::find
-  (tree_argument_list *args, const string_vector& arg_names,
-   octave_value_list& evaluated_args, bool& args_evaluated)
+symbol_table::fcn_info::fcn_info_rep::find (const octave_value_list& args)
 {
-  octave_value retval = xfind (args, arg_names, evaluated_args, args_evaluated);
+  octave_value retval = xfind (args);
 
   if (! retval.is_defined ())
     {
@@ -526,16 +501,14 @@
 
       load_path::update ();
 
-      retval = xfind (args, arg_names, evaluated_args, args_evaluated);
+      retval = xfind (args);
     }
 
   return retval;
 }
 
 octave_value
-symbol_table::fcn_info::fcn_info_rep::xfind
-  (tree_argument_list *args, const string_vector& arg_names,
-   octave_value_list& evaluated_args, bool& args_evaluated)
+symbol_table::fcn_info::fcn_info_rep::xfind (const octave_value_list& args)
 {
   // Subfunction.  I think it only makes sense to check for
   // subfunctions if we are currently executing a function defined
@@ -644,42 +617,21 @@
 
   // Class methods.
 
-  if (args_evaluated || (args && args->length () > 0))
+  if (! args.empty ())
     {
-      if (! args_evaluated)
-	evaluated_args = args->convert_to_const_vector ();
-
-      if (! error_state)
-	{
-	  int n = evaluated_args.length ();
-
-	  if (n > 0 && ! args_evaluated)
-	    evaluated_args.stash_name_tags (arg_names);
+      std::string dispatch_type = get_dispatch_type (args);
 
-	  args_evaluated = true;
-
-	  if (n > 0)
-	    {
-	      std::string dispatch_type = get_dispatch_type (evaluated_args);
+      octave_value fcn = find_method (dispatch_type);
 
-	      octave_value fcn = find_method (dispatch_type);
-
-	      if (fcn.is_defined ())
-		return fcn;
-	    }
-	}
-      else
-	return octave_value ();
+      if (fcn.is_defined ())
+        return fcn;
     }
 
-  // Legacy dispatch.  We just check args_evaluated here because the
-  // actual evaluation will have happened already when searching for
-  // class methods.
+  // Legacy dispatch.  
 
-  if (args_evaluated && ! dispatch_map.empty ())
+  if (! args.empty () && ! dispatch_map.empty ())
     {
-      std::string dispatch_type = 
-        const_cast<const octave_value_list&>(evaluated_args)(0).type_name ();
+      std::string dispatch_type = args(0).type_name ();
 
       std::string fname;
 
@@ -693,7 +645,7 @@
 	  fname = p->second;
 
 	  octave_value fcn
-	    = symbol_table::find_function (fname, evaluated_args);
+	    = symbol_table::find_function (fname, args);
 
 	  if (fcn.is_defined ())
 	    return fcn;
@@ -1080,25 +1032,20 @@
 }
 
 octave_value
-symbol_table::fcn_info::find (tree_argument_list *args,
-			      const string_vector& arg_names,
-			      octave_value_list& evaluated_args,
-			      bool& args_evaluated)
+symbol_table::fcn_info::find (const octave_value_list& args)
 {
-  return rep->find (args, arg_names, evaluated_args, args_evaluated);
+  return rep->find (args);
 }
 
 octave_value
-symbol_table::find (const std::string& name, tree_argument_list *args,
-		    const string_vector& arg_names,
-		    octave_value_list& evaluated_args, bool& args_evaluated,
-		    bool skip_variables)
+symbol_table::find (const std::string& name, 
+                    const octave_value_list& args, 
+                    bool skip_variables)
 {
   symbol_table *inst = get_instance (xcurrent_scope);
 
   return inst
-    ? inst->do_find (name, args, arg_names, evaluated_args,
-		     args_evaluated, skip_variables)
+    ? inst->do_find (name, args, skip_variables)
     : octave_value ();
 }
 
@@ -1111,10 +1058,8 @@
 }
 
 octave_value
-symbol_table::find_function (const std::string& name, tree_argument_list *args,
-			     const string_vector& arg_names,
-			     octave_value_list& evaluated_args,
-			     bool& args_evaluated)
+symbol_table::find_function (const std::string& name,
+                             const octave_value_list& args)
 {
   octave_value retval;
 
@@ -1135,8 +1080,7 @@
       size_t pos = name.find_first_of (Vfilemarker);
 
       if (pos == std::string::npos)
-	retval = find (name, args, arg_names, evaluated_args,
-		       args_evaluated, true);
+	retval = find (name, args, true);
       else
 	{
 	  std::string fcn_scope = name.substr (0, pos);
@@ -1153,9 +1097,7 @@
 		  xcurrent_scope = parent_fcn->scope ();
 
 		  if (xcurrent_scope > 1)
-		    retval = find_function (name.substr (pos + 1), args,
-					    arg_names, evaluated_args, 
-					    args_evaluated);
+		    retval = find_function (name.substr (pos + 1), args);
 		}
 	    }
 
@@ -1264,10 +1206,9 @@
 }
 
 octave_value
-symbol_table::do_find (const std::string& name, tree_argument_list *args,
-		       const string_vector& arg_names,
-		       octave_value_list& evaluated_args,
-		       bool& args_evaluated, bool skip_variables)
+symbol_table::do_find (const std::string& name, 
+                       const octave_value_list& args,
+		       bool skip_variables)
 {
   octave_value retval;
 
@@ -1298,13 +1239,12 @@
   fcn_table_iterator p = fcn_table.find (name);
 
   if (p != fcn_table.end ())
-    return p->second.find (args, arg_names, evaluated_args, args_evaluated);
+    return p->second.find (args);
   else
     {
       fcn_info finfo (name);
 
-      octave_value fcn = finfo.find (args, arg_names, evaluated_args,
-				     args_evaluated);
+      octave_value fcn = finfo.find (args);
 
       if (fcn.is_defined ())
 	fcn_table[name] = finfo;
diff -r 0c785ad961fa -r c5f03874ea2a src/symtab.h
--- a/src/symtab.h	Tue Jul 21 12:43:33 2009 -0400
+++ b/src/symtab.h	Wed Jul 22 11:41:41 2009 +0200
@@ -424,9 +424,7 @@
 
     std::string name (void) const { return rep->name; }
 
-    octave_value
-    find (tree_argument_list *args, const string_vector& arg_names,
-	  octave_value_list& evaluated_args, bool& args_evaluated) const;
+    octave_value find (const octave_value_list& args = octave_value_list ()) const;
 
     octave_value builtin_find (void) const;
 
@@ -542,9 +540,7 @@
 
       octave_value load_class_method (const std::string& dispatch_type);
 
-      octave_value
-      find (tree_argument_list *args, const string_vector& arg_names,
-	    octave_value_list& evaluated_args, bool& args_evaluated);
+      octave_value find (const octave_value_list& args = octave_value_list ());
 
       octave_value builtin_find (void);
 
@@ -559,20 +555,9 @@
 	return function_on_path.is_defined ();
       }
 
-      octave_value find_function (void)
+      octave_value find_function (const octave_value_list& args = octave_value_list ())
       {
-	octave_value_list args;
-
-	return find_function (args);
-      }
-
-      octave_value find_function (const octave_value_list& args)
-      {
-	string_vector arg_names;
-	octave_value_list evaluated_args = args;
-	bool args_evaluated = false;
-
-	return find (0, arg_names, evaluated_args, args_evaluated);
+	return find (args);
       }
 
       void lock_subfunction (scope_id scope)
@@ -735,9 +720,7 @@
 
     private:
 
-      octave_value
-      xfind (tree_argument_list *args, const string_vector& arg_names,
-	     octave_value_list& evaluated_args, bool& args_evaluated);
+      octave_value xfind (const octave_value_list& args);
 
       octave_value x_builtin_find (void);
 
@@ -778,9 +761,7 @@
 	delete rep;
     }
 
-    octave_value
-    find (tree_argument_list *args, const string_vector& arg_names,
-	  octave_value_list& evaluated_args, bool& args_evaluated);
+    octave_value find (const octave_value_list& args);
 
     octave_value builtin_find (void)
     {
@@ -1052,9 +1033,8 @@
 
   // Find a value corresponding to the given name in the table.
   static octave_value
-  find (const std::string& name, tree_argument_list *args,
-	const string_vector& arg_names,
-	octave_value_list& evaluated_args, bool& args_evaluated,
+  find (const std::string& name, 
+        const octave_value_list& args = octave_value_list (),
 	bool skip_variables = false);
 
   static octave_value builtin_find (const std::string& name);
@@ -1193,9 +1173,8 @@
   }
 
   static octave_value
-  find_function (const std::string& name, tree_argument_list *args,
-		 const string_vector& arg_names,
-		 octave_value_list& evaluated_args, bool& args_evaluated);
+  find_function (const std::string& name, 
+                 const octave_value_list& args = octave_value_list ());
 
   static octave_value find_user_function (const std::string& name)
   {
@@ -1205,23 +1184,6 @@
       ? p->second.find_user_function () : octave_value ();
   }
 
-  static octave_value find_function (const std::string& name)
-  {
-    octave_value_list evaluated_args;
-
-    return find_function (name, evaluated_args);
-  }
-
-  static octave_value
-  find_function (const std::string& name, const octave_value_list& args)
-  {
-    string_vector arg_names;
-    octave_value_list evaluated_args = args;
-    bool args_evaluated = ! args.empty ();
-
-    return find_function (name, 0, arg_names, evaluated_args, args_evaluated);
-  }
-
   static void install_cmdline_function (const std::string& name,
 					const octave_value& fcn)
   {
@@ -2012,10 +1974,8 @@
     }
 
   octave_value
-  do_find (const std::string& name, tree_argument_list *args,
-	   const string_vector& arg_names,
-	   octave_value_list& evaluated_args, bool& args_evaluated,
-	   bool skip_variables);
+  do_find (const std::string& name, const octave_value_list& args,
+           bool skip_variables);
 
   octave_value do_builtin_find (const std::string& name);
 
diff -r 0c785ad961fa -r c5f03874ea2a src/variables.cc
--- a/src/variables.cc	Tue Jul 21 12:43:33 2009 -0400
+++ b/src/variables.cc	Wed Jul 22 11:41:41 2009 +0200
@@ -395,11 +395,7 @@
   // name that is visible in the current scope will be in the local
   // symbol table.
 
-  octave_value_list evaluated_args;
-  bool args_evaluated = false;
-
-  octave_value val = symbol_table::find (symbol_name, 0, string_vector (),
-					 evaluated_args, args_evaluated);
+  octave_value val = symbol_table::find (symbol_name);
 
   if (val.is_defined ())
     {