LEV_COMP(6)                                           LEV_COMP(6)



NAME
       lev_comp - NetHack special levels compiler

SYNOPSIS
       lev_comp [ -w ] [ files ]

       If no arguments are given, it reads standard input.

DESCRIPTION
       Lev_comp  is  a special level compiler for NetHack version
       3.2 and higher.  It takes description files  as  arguments
       and  produces level files that can be loaded by NetHack at
       runtime.

       The purpose of this tool is to provide NetHack administra­
       tors  and  implementors  with  a convenient way for adding
       special levels to the game, or  modifying  existing  ones,
       without having to recompile the entire world.

       The  -w  option causes lev_comp to perform extra checks on
       the level and display extra warnings, however these  warn­
       ings  are  sometimes superfluous, so they are not normally
       displayed.


GRAMMAR
       file            : /* nothing */
                       | levels
                       ;

       levels          : level
                       | level levels
                       ;

       level           : maze_level
                       | room_level
                       ;

       maze_level      : maze_def flags lev_init messages regions
                       ;

       room_level      : level_def flags lev_init messages rreg_init rooms corridors_def
                       ;

       level_def       : LEVEL_ID ':' string
                       ;

       lev_init        : /* nothing */
                       | LEV_INIT_ID ':' CHAR ',' CHAR ',' BOOLEAN ',' BOOLEAN ',' light_state ',' walled
                       ;

       walled          : BOOLEAN
                       | RANDOM_TYPE
                       ;

       flags           : /* nothing */
                       | FLAGS_ID ':' flag_list
                       ;

       flag_list       : FLAG_TYPE ',' flag_list
                       | FLAG_TYPE
                       ;

       messages        : /* nothing */
                       | message messages
                       ;

       message         : MESSAGE_ID ':' STRING
                       ;

       rreg_init       : /* nothing */
                       | rreg_init init_rreg
                       ;

       init_rreg       : RANDOM_OBJECTS_ID ':' object_list
                       | RANDOM_MONSTERS_ID ':' monster_list
                       ;

       rooms           : /* Nothing  -  dummy room for use with INIT_MAP */
                       | roomlist
                       ;

       roomlist        : aroom
                       | aroom roomlist
                       ;

       corridors_def   : random_corridors
                       | corridors
                       ;

       random_corridors: RAND_CORRIDOR_ID
                       ;

       corridors       : /* nothing */
                       | corridors corridor
                       ;

       corridor        : CORRIDOR_ID ':' corr_spec ',' corr_spec
                       | CORRIDOR_ID ':' corr_spec ',' INTEGER
                       ;

       corr_spec       : '(' INTEGER ',' DIRECTION ',' door_pos ')'
                       ;

       aroom           : room_def room_details
                       | subroom_def room_details
                       ;

       subroom_def     : SUBROOM_ID ':' room_type ',' light_state ',' subroom_pos ',' room_size ',' string roomfill
                       ;

       room_def        : ROOM_ID ':' room_type ',' light_state ',' room_pos ',' room_align ',' room_size roomfill
                       ;

       roomfill        : /* nothing */
                       | ',' BOOLEAN
                       ;

       room_pos        : '(' INTEGER ',' INTEGER ')'
                       | RANDOM_TYPE
                       ;

       subroom_pos     : '(' INTEGER ',' INTEGER ')'
                       | RANDOM_TYPE
                       ;

       room_align      : '(' h_justif ',' v_justif ')'
                       | RANDOM_TYPE
                       ;

       room_size       : '(' INTEGER ',' INTEGER ')'
                       | RANDOM_TYPE
                       ;

       room_details    : /* nothing */
                       | room_details room_detail
                       ;

       room_detail     : room_name
                       | room_chance
                       | room_door
                       | monster_detail
                       | object_detail
                       | trap_detail
                       | altar_detail
                       | fountain_detail
                       | sink_detail
                       | pool_detail
                       | gold_detail
                       | engraving_detail
                       | stair_detail
                       ;

       room_name       : NAME_ID ':' string
                       ;

       room_chance     : CHANCE_ID ':' INTEGER
                       ;

       room_door       : DOOR_ID ':' secret ',' door_state ',' door_wall ',' door_pos
                       ;

       secret          : BOOLEAN
                       | RANDOM_TYPE
                       ;

       door_wall       : DIRECTION
                       | RANDOM_TYPE
                       ;

       door_pos        : INTEGER
                       | RANDOM_TYPE
                       ;

       maze_def        : MAZE_ID ':' string ',' filling
                       ;

       filling         : CHAR
                       | RANDOM_TYPE
                       ;

       regions         : aregion
                       | aregion regions
                       ;

       aregion         : map_definition reg_init map_details
                       ;

       map_definition  : NOMAP_ID
                       | map_geometry MAP_ID
                       ;

       map_geometry    : GEOMETRY_ID ':' h_justif ',' v_justif
                       ;

       h_justif        : LEFT_OR_RIGHT
                       | CENTER
                       ;

       v_justif        : TOP_OR_BOT
                       | CENTER
                       ;

       reg_init        : /* nothing */
                       | reg_init init_reg
                       ;

       init_reg        : RANDOM_OBJECTS_ID ':' object_list
                       | RANDOM_PLACES_ID ':' place_list
                       | RANDOM_MONSTERS_ID ':' monster_list
                       ;

       object_list     : object
                       | object ',' object_list
                       ;

       monster_list    : monster
                       | monster ',' monster_list
                       ;

       place_list      : place
                       | place ',' place_list
                       ;

       map_details     : /* nothing */
                       | map_details map_detail
                       ;

       map_detail      : monster_detail
                       | object_detail
                       | door_detail
                       | trap_detail
                       | drawbridge_detail
                       | region_detail
                       | stair_region
                       | portal_region
                       | teleprt_region
                       | branch_region
                       | altar_detail
                       | fountain_detail
                       | mazewalk_detail
                       | wallify_detail
                       | ladder_detail
                       | stair_detail
                       | gold_detail
                       | engraving_detail
                       | diggable_detail
                       | passwall_detail
                       ;

       monster_detail  : MONSTER_ID chance ':' monster_c ',' m_name ',' coordinate
                        monster_infos
                       ;

       monster_infos   : /* nothing */
                       | monster_infos monster_info
                       ;

       monster_info    : ',' string
                       | ',' MON_ATTITUDE
                       | ',' MON_ALERTNESS
                       | ',' alignment
                       | ',' MON_APPEARANCE string
                       ;

       object_detail   : OBJECT_ID object_desc
                       | COBJECT_ID object_desc
                       ;

       object_desc     : chance ':' object_c ',' o_name ',' object_where object_infos
                       ;

       object_where    : coordinate
                       | CONTAINED
                       ;

       object_infos    : /* nothing */
                       | ',' curse_state ',' monster_id ',' enchantment optional_name
                       | ',' curse_state ',' enchantment optional_name
                       | ',' monster_id ',' enchantment optional_name
                       ;

       curse_state     : RANDOM_TYPE
                       | CURSE_TYPE
                       ;

       monster_id      : STRING
                       ;

       enchantment     : RANDOM_TYPE
                       | INTEGER
                       ;

       optional_name   : /* nothing */
                       | ',' NONE
                       | ',' STRING
                       ;

       door_detail     : DOOR_ID ':' door_state ',' coordinate
                       ;

       trap_detail     : TRAP_ID chance ':' trap_name ',' coordinate
                       ;

       drawbridge_detail: DRAWBRIDGE_ID ':' coordinate ',' DIRECTION ',' door_state
                       ;

       mazewalk_detail : MAZEWALK_ID ':' coordinate ',' DIRECTION
                       ;

       wallify_detail  : WALLIFY_ID
                       ;

       ladder_detail   : LADDER_ID ':' coordinate ',' UP_OR_DOWN
                       ;

       stair_detail    : STAIR_ID ':' coordinate ',' UP_OR_DOWN
                       ;

       stair_region    : STAIR_ID ':' lev_region ',' lev_region ',' UP_OR_DOWN
                       ;

       portal_region   : PORTAL_ID ':' lev_region ',' lev_region ',' string
                       ;

       teleprt_region  : TELEPRT_ID ':' lev_region ',' lev_region teleprt_detail
                       ;

       branch_region   : BRANCH_ID ':' lev_region ',' lev_region
                       ;

       teleprt_detail  : /* empty */
                       | ',' UP_OR_DOWN
                       ;

       lev_region      : region
                       | LEV '(' INTEGER ',' INTEGER ',' INTEGER ',' INTEGER ')'
                       ;

       fountain_detail : FOUNTAIN_ID ':' coordinate
                       ;

       sink_detail : SINK_ID ':' coordinate
                       ;

       pool_detail : POOL_ID ':' coordinate
                       ;

       diggable_detail : NON_DIGGABLE_ID ':' region
                       ;

       passwall_detail : NON_PASSWALL_ID ':' region
                       ;

       region_detail   : REGION_ID ':' region ',' light_state ',' room_type prefilled
                       ;

       altar_detail    : ALTAR_ID ':' coordinate ',' alignment ',' altar_type
                       ;

       gold_detail     : GOLD_ID ':' amount ',' coordinate
                       ;

       engraving_detail: ENGRAVING_ID ':' coordinate ',' engraving_type ',' string
                       ;

       monster_c       : monster
                       | RANDOM_TYPE
                       | m_register
                       ;

       object_c        : object
                       | RANDOM_TYPE
                       | o_register
                       ;

       m_name          : string
                       | RANDOM_TYPE
                       ;

       o_name          : string
                       | RANDOM_TYPE
                       ;

       trap_name       : string
                       | RANDOM_TYPE
                       ;

       room_type       : string
                       | RANDOM_TYPE
                       ;

       prefilled       : /* empty */
                       | ',' FILLING
                       | ',' FILLING ',' BOOLEAN
                       ;

       coordinate      : coord
                       | p_register
                       | RANDOM_TYPE
                       ;

       door_state      : DOOR_STATE
                       | RANDOM_TYPE
                       ;

       light_state     : LIGHT_STATE
                       | RANDOM_TYPE
                       ;

       alignment       : ALIGNMENT
                       | a_register
                       | RANDOM_TYPE
                       ;

       altar_type      : ALTAR_TYPE
                       | RANDOM_TYPE
                       ;

       p_register      : P_REGISTER '[' INTEGER ']'
                       ;

       o_register      : O_REGISTER '[' INTEGER ']'
                       ;

       m_register      : M_REGISTER '[' INTEGER ']'
                       ;

       a_register      : A_REGISTER '[' INTEGER ']'
                       ;

       place           : coord
                       | NONE
                       ;

       monster         : CHAR
                       ;

       object          : CHAR
                       ;

       string          : STRING
                       ;

       amount          : INTEGER
                       | RANDOM_TYPE
                       ;

       chance          : /* empty */
                       | PERCENT
                       ;

       engraving_type  : ENGRAVING_TYPE
                       | RANDOM_TYPE
                       ;

       coord           : '(' INTEGER ',' INTEGER ')'
                       ;

       region          : '(' INTEGER ',' INTEGER ',' INTEGER ',' INTEGER ')'
                       ;

       NOTE:
       Lines beginning with '#' are considered comments.

       The contents of a "MAP" description of a maze is a rectan­
       gle  showing  the  exact level map that should be used for
       the given part of a maze.  Each character in the map  cor­
       responds  to a location on the screen.  Different location
       types are denoted using different ASCII  characters.   The
       following  characters  are recognized.  To give an idea of
       how these are used, see the EXAMPLE, below.   The  maximum
       size of a map is normally 76 columns by 21 rows.

       '-'     horizontal wall
       '|'     vertical wall
       '+'     a doorway (state is specified in a DOOR declaration)
       'A'     open air
       'B'     boundary room location (for bounding unwalled irregular regions)
       'C'     cloudy air
       'I'     ice
       'S'     a secret door
       'H'     a secret corridor
       '{'     a fountain
       '\'     a throne
       'K'     a sink (if SINKS is defined, else a room location)
       'Z'     a toilet (if SINKS is defined, else a room location)
       '}'     a part of a moat or other deep water
       'P'     a pool
       'L'     lava
       'W'     water (yes, different from a pool)
       'T'     a tree
       'F'     iron bars
       '#'     a corridor
       '.'     a normal room location (unlit unless lit in a REGION declaration)
       ' '     stone

EXAMPLE
       Here  is  an  example of a description file (a very simple
       one):

       MAZE : "fortress", random
       GEOMETRY : center , center
       MAP
       }}}}}}}}}
       }}}|-|}}}
       }}|-.-|}}
       }|-...-|}
       }|.....|}
       }|-...-|}
       }}|-.-|}}
       }}}|-|}}}
       }}}}}}}}}
       ENDMAP
       MONSTER: '@', "Wizard of Yendor", (4,4)
       OBJECT: '"', "Amulet of Yendor", (4,4)
       # a hell hound flanking the Wiz on a random side
       RANDOM_PLACES: (4,3), (4,5), (3,4), (5,4)
       MONSTER: 'd', "hell hound", place[0]
       # a chest on another random side
       OBJECT: '(', "chest", place[1]
       # a sack on a random side, with a diamond and maybe a ruby in it
       CONTAINER: '(', "sack", place[2]
       OBJECT: '*', "diamond", contained
       OBJECT[50%]: '*', "ruby", contained
       # a random dragon somewhere
       MONSTER: 'D', random, random
       # 3 out of 4 chance for a random trap in the EAST end
       TRAP[75%]: random, (6,4)
       # an electric eel below the SOUTH end
       MONSTER: ';', "electric eel", (4,8)
       # make the walls non-diggable
       NON_DIGGABLE: (0,0,8,8)
       TELEPORT_REGION: levregion(0,0,79,20), (0,0,8,8)

       This example will produce a file named "fortress" that can
       be  integrated into one of the numerous mazes of the game.

       Note especially the final, TELEPORT_REGION  specification.
       This  says  that  level  teleports  or  other non-stairway
       arrivals on this level can  land  anywhere  on  the  level
       except  the  area  of  the map.  This shows the use of the
       ``levregion'' prefix allowed in certain region  specifica­
       tions.   Normally,  regions  apply only to the most recent
       MAP specification, but when prefixed  with  ``levregion'',
       one  can refer to any area of the level, regardless of the
       placement of the current MAP in the level.

AUTHOR
       Jean-Christophe Collet, David Cohrs.

SEE ALSO
       dgn_comp(6), nethack(6)

BUGS
       Probably infinite.  Most importantly,  still  needs  addi­
       tional bounds checking.



                           16 May 1996                LEV_COMP(6)
