From: why the lucky stiff <yaml-core@...>
Date: 2003-03-15T08:05:41+09:00
Subject: Re: [ANN] Syck 0.08 -- Next-generation of YAML.rb

On Friday 14 March 2003 01:40 pm, Daniel Berger wrote:
> bison -y  -d -t -v gram.y && mv y.tab.c gram.c
> gram.y:47.9-52.4: type clash (`nodeId' `') on default action
> ...<assorted errors>...

Ok.  These errors are caused by missing semicolons at the end of each of rule.  
So:

implicit_map    : IOPEN in_implicit_map IEND
                {   
                    $$ = $2;
                }

Should be:

implicit_map    : IOPEN in_implicit_map IEND
                {   
                    $$ = $2;
                }
		;

See gram.y below.

_why

//
// gram.y
//
// $Author: whythluckystiff $
// $Date: 2003/03/14 05:29:26 $
//
// Copyright (C) 2003 why the lucky stiff
//

%start doc
%pure-parser

%{

#include "syck.h"

#define YYPARSE_PARAM parser
#define YYLEX_PARAM parser

%}

%union {
    SYMID nodeId;
    SyckNode *nodeData;
    char *name;
};

%token <name>       ANCHOR ALIAS TRANSFER ITRANSFER
%token <nodeData>   WORD PLAIN BLOCK
%token              DOCSEP IOPEN INDENT IEND

%type <nodeId>      doc basic_seq
%type <nodeData>    atom word_rep struct_rep atom_or_empty
%type <nodeData>    implicit_seq inline_seq implicit_map inline_map
%type <nodeData>    in_implicit_seq in_inline_seq basic_mapping basic_mapping2
%type <nodeData>    in_implicit_map in_inline_map complex_mapping

%left               '-' ':'
%left               '+' '[' ']' '{' '}' ',' '?'

%%

doc     : struct_rep
        {
           ((SyckParser *)parser)->root = syck_hdlr_add_node( (SyckParser 
*)parser, $1 );
        }
        | DOCSEP atom        
        {
           ((SyckParser *)parser)->root = syck_hdlr_add_node( (SyckParser 
*)parser, $2 );
        }
        ;

atom	: word_rep
        | struct_rep
        | ANCHOR atom								
        { 
           /*
            * _Anchors_: The language binding must keep a separate symbol 
table
            * for anchors.  The actual ID in the symbol table is returned to 
the
            * higher nodes, though.
            */
           $$ = syck_hdlr_add_anchor( (SyckParser *)parser, $1, $2 );
        }
		| ALIAS										
        {
           /*
            * _Aliases_: The anchor symbol table is scanned for the anchor 
name.
            * The anchor's ID in the language's symbol table is returned.
            */
           $$ = syck_hdlr_add_alias( (SyckParser *)parser, $1 );
        }
        | IOPEN atom IEND
        {
           $$ = $2;
        }
        ;

atom_or_empty   : atom
                |
                {
                   SyckNode *n = syck_new_str( "" ); 
                   n->type_id = "null";
                   $$ = n;
                }
                ;

//
// Words are broken out to distinguish them
// as keys in implicit maps and valid elements
// for the inline structures
//
word_rep	: TRANSFER word_rep						
            { 
               $$ = syck_add_transfer( $1, $2 );
            } 
            | ITRANSFER word_rep						
            { 
               if ( ((SyckParser *)parser)->implicit_typing == 1 )
               {
                  try_tag_implicit( $2 );
               }
               $$ = $2;
            }
			| WORD
            { 
               SyckNode *n = $1;
               n->type_id = "str";
               $$ = n;
            }
            | PLAIN
            {
                $$ = $1;
            }
            ;

//
// Any of these structures can be used as
// complex keys
//
struct_rep	: TRANSFER struct_rep
            { 
                $$ = syck_add_transfer( $1, $2 );
            }
			| BLOCK
			{ 
                //SyckNode *n = $3;
                //syck_fold_format( $1, $3 );
                //n->type_id = "str";
                //$$ = n;
                $$ = $1;
			}
			| implicit_seq
			| inline_seq
			| implicit_map
			| inline_map
            ;

//
// Implicit sequence 
//
implicit_seq	: IOPEN in_implicit_seq	IEND	
                { 
                    $$ = $2;
                }
                ;

basic_seq       : '-' atom_or_empty             
                { 
                    $$ = syck_hdlr_add_node( (SyckParser *)parser, $2 );
                }
                ;

in_implicit_seq : basic_seq
                {
                    $$ = syck_new_seq( $1 );
                }
				| in_implicit_seq INDENT basic_seq
				{ 
                    syck_seq_add( $1, $3 );
                    $$ = $1;
				}
                ;

//
// Inline sequences
//
inline_seq		: '[' in_inline_seq ']'
                { 
                    $$ = $2;
                }
				| '[' ']'
                { 
                    $$ = syck_alloc_seq();
                }
                ;

in_inline_seq   : atom
                {
                    $$ = syck_new_seq( syck_hdlr_add_node( (SyckParser 
*)parser, $1 ) );
                }
                | in_inline_seq ',' atom
				{ 
                    syck_seq_add( $1, syck_hdlr_add_node( (SyckParser 
*)parser, $3 ) );
                    $$ = $1;
				}
                ;

//
// Implicit maps
//
implicit_map	: IOPEN in_implicit_map IEND
                { 
                    $$ = $2;
                }
                ;

basic_mapping	: word_rep ':' atom_or_empty
                {
                    $$ = syck_new_map( 
                        syck_hdlr_add_node( (SyckParser *)parser, $1 ), 
                        syck_hdlr_add_node( (SyckParser *)parser, $3 ) );
                }
                ;

complex_mapping : basic_mapping
				| '?' atom INDENT ':' atom_or_empty
                {
                    $$ = syck_new_map( 
                        syck_hdlr_add_node( (SyckParser *)parser, $2 ), 
                        syck_hdlr_add_node( (SyckParser *)parser, $5 ) );
                }
                ;

in_implicit_map : complex_mapping
				{
                    $$ = $1;
				}
				| in_implicit_map INDENT complex_mapping
                { 
                    syck_map_update( $1, $3 );
                    $$ = $1;
                }
                ;

//
// Inline maps
//
basic_mapping2	: atom ':' atom_or_empty
                {
                    $$ = syck_new_map( 
                        syck_hdlr_add_node( (SyckParser *)parser, $1 ), 
                        syck_hdlr_add_node( (SyckParser *)parser, $3 ) );
                }
                ;

inline_map		: '{' in_inline_map '}'
                {
                    $$ = $2;
                }
          		| '{' '}'
                {
                    $$ = syck_alloc_map();
                }
                ;
         
in_inline_map	: basic_mapping2 
				{
					$$ = $1;
				}
				| in_inline_map ',' basic_mapping2
				{
                    syck_map_update( $1, $3 );
                    $$ = $1;
				}
                ;

%%