recognize variables when parsing (bug #38576) * lex.h, lex.ll (lexical_feedback::mark_as_variable, lexical_feedback::maybe_mark_previous_token_as_variable, lexical_feedback::mark_as_variables, octave_lexer::is_variable): New fucntions. ("="): Call maybe_mark_previous_toke_as_variable. (handle_identifier): Don't tag variables as possible commands. (param_list): Mark names in list as variables. (octave_base_parser::validate_matrix_for_assignment): Likewise. * pt-arg-list.h, pt-arg-list.cc (tree_argument_list::variable_names): New function. * pt-misc.h, pt-misc.cc (tree_parameter_list::variable_names): New function. * token.h, token.cc (token::symbol_name, token::is_symbol): New functions. * test/bug-38576.tst: New file. * test/Makefile.am (FCN_FILES): Add bug-38576.tst to the list.

--- a/libinterp/parse-tree/pt-arg-list.cc	Sat Mar 23 00:09:25 2013 +0100
+++ b/libinterp/parse-tree/pt-arg-list.cc	Sat Mar 23 15:02:29 2013 -0400
@@ -283,6 +283,26 @@
   return retval;
 }
 
+std::list<std::string>
+tree_argument_list::variable_names (void) const
+{
+  std::list<std::string> retval;
+
+  for (const_iterator p = begin (); p != end (); p++)
+    {
+      tree_expression *elt = *p;
+
+      if (elt->is_identifier ())
+        {
+          tree_identifier *id = dynamic_cast<tree_identifier *> (elt);
+      
+          retval.push_back (id->name ());
+        }
+    }
+
+  return retval;
+}
+
 tree_argument_list *
 tree_argument_list::dup (symbol_table::scope_id scope,
                          symbol_table::context_id context) const