* parse.y (f_block_optarg): allow default for block parameters as

  long as the value is primary.  a patch from Eric Mahurin
  <eric.mahurin at gmail.com> in [ruby-core:16880].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@19199 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 104 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index e6bff49538..eab982b75f 100644
--- a/parse.y
+++ b/parse.y
@@ -673,6 +673,7 @@ static void token_info_pop(struct parser_params*, const char *token);
 %type <node> paren_args opt_paren_args
 %type <node> command_args aref_args opt_block_arg block_arg var_ref var_lhs
 %type <node> mrhs superclass block_call block_command
+%type <node> f_block_optarg f_block_opt
 %type <node> f_arglist f_args f_arg f_arg_item f_optarg f_marg f_marg_list f_margs
 %type <node> assoc_list assocs assoc undef_list backref string_dvar for_var
 %type <node> block_param opt_block_param block_param_def f_opt
@@ -3206,7 +3207,39 @@ f_margs		: f_marg_list
 		    }
 		;
 
-block_param	: f_arg ',' f_rest_arg opt_f_block_arg
+block_param	: f_arg ',' f_block_optarg ',' f_rest_arg opt_f_block_arg
+		    {
+		    /*%%%*/
+			$$ = new_args($1, $3, $5, 0, $6);
+		    /*%
+			$$ = params_new($1, $3, $5, Qnil, escape_Qundef($6));
+		    %*/
+		    }
+		| f_arg ',' f_block_optarg ',' f_rest_arg ',' f_arg opt_f_block_arg
+		    {
+		    /*%%%*/
+			$$ = new_args($1, $3, $5, $7, $8);
+		    /*%
+			$$ = params_new($1, $3, $5, $7, escape_Qundef($8));
+		    %*/
+		    }
+		| f_arg ',' f_block_optarg opt_f_block_arg
+		    {
+		    /*%%%*/
+			$$ = new_args($1, $3, 0, 0, $4);
+		    /*%
+			$$ = params_new($1, $3, Qnil, Qnil, escape_Qundef($4));
+		    %*/
+		    }
+		| f_arg ',' f_block_optarg ',' f_arg opt_f_block_arg
+		    {
+		    /*%%%*/
+			$$ = new_args($1, $3, 0, $5, $6);
+		    /*%
+			$$ = params_new($1, $3, Qnil, $5, escape_Qundef($6));
+		    %*/
+		    }
+                | f_arg ',' f_rest_arg opt_f_block_arg
 		    {
 		    /*%%%*/
 			$$ = new_args($1, 0, $3, 0, $4);
@@ -3239,6 +3272,38 @@ block_param	: f_arg ',' f_rest_arg opt_f_block_arg
 			$$ = params_new($1, Qnil,Qnil, Qnil, escape_Qundef($2));
 		    %*/
 		    }
+		| f_block_optarg ',' f_rest_arg opt_f_block_arg
+		    {
+		    /*%%%*/
+			$$ = new_args(0, $1, $3, 0, $4);
+		    /*%
+			$$ = params_new(Qnil, $1, $3, Qnil, escape_Qundef($4));
+		    %*/
+		    }
+		| f_block_optarg ',' f_rest_arg ',' f_arg opt_f_block_arg
+		    {
+		    /*%%%*/
+			$$ = new_args(0, $1, $3, $5, $6);
+		    /*%
+			$$ = params_new(Qnil, $1, $3, $5, escape_Qundef($6));
+		    %*/
+		    }
+		| f_block_optarg opt_f_block_arg
+		    {
+		    /*%%%*/
+			$$ = new_args(0, $1, 0, 0, $2);
+		    /*%
+			$$ = params_new(Qnil, $1, Qnil, Qnil,escape_Qundef($2));
+		    %*/
+		    }
+		| f_block_optarg ',' f_arg opt_f_block_arg
+		    {
+		    /*%%%*/
+			$$ = new_args(0, $1, 0, $3, $4);
+		    /*%
+			$$ = params_new(Qnil, $1, Qnil, $3, escape_Qundef($4));
+		    %*/
+		    }
 		| f_rest_arg opt_f_block_arg
 		    {
 		    /*%%%*/
@@ -4339,6 +4404,44 @@ f_opt		: tIDENTIFIER '=' arg_value
 		    }
 		;
 
+f_block_opt	: tIDENTIFIER '=' primary_value
+		    {
+		    /*%%%*/
+			if (!is_local_id($1))
+			    yyerror("formal argument must be local variable");
+			shadowing_lvar($1);
+			arg_var($1);
+			$$ = NEW_OPT_ARG(0, assignable($1, $3));
+		    /*%
+			$$ = rb_assoc_new($1, $3);
+		    %*/
+		    }
+		;
+
+f_block_optarg	: f_block_opt
+		    {
+		    /*%%%*/
+			$$ = $1;
+		    /*%
+			$$ = rb_ary_new3(1, $1);
+		    %*/
+		    }
+		| f_block_optarg ',' f_block_opt
+		    {
+		    /*%%%*/
+			NODE *opts = $1;
+
+			while (opts->nd_next) {
+			    opts = opts->nd_next;
+			}
+			opts->nd_next = $3;
+			$$ = $1;
+		    /*%
+			$$ = rb_ary_push($1, $3);
+		    %*/
+		    }
+		;
+
 f_optarg	: f_opt
 		    {
 		    /*%%%*/