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<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<el:level xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://enigma-game.org/schema/level/1 level.xsd" xmlns:el="http://enigma-game.org/schema/level/1">
<el:protected>
<el:info el:type="library">
<el:identity el:title="" el:id="lib/libimport"/>
<el:version el:score="1" el:release="1" el:revision="2" el:status="released"/>
<el:author el:name="Enigma Team" el:email="" el:homepage=""/>
<el:copyright>Copyright © 2009 Enigma Team</el:copyright>
<el:license el:type="GPL v2.0 or above" el:open="true"/>
<el:compatibility el:enigma="1.10">
<el:dependency el:path="lib/libmap" el:id="lib/libmap" el:release="1" el:preload="true"/>
</el:compatibility>
<el:modes el:easy="false" el:single="false" el:network="false"/>
<el:comments>
</el:comments>
<el:score el:easy="-" el:difficult="-"/>
</el:info>
<el:luamain><![CDATA[
-- libimport.xml is dedicated to parse level files of other
-- games or formats and typically returns libmap-maps.
-- In this context, the word "level" refers to a string,
-- representing a level of the other game. "multilevel"
-- is a string composed of one or more levels.
-- A "monolevel" is a string which holds a single level,
-- but also additional information, so it has to be handled
-- as multilevel to extract the level.
-- A map is a map in the libmap-sense, i.e. an Enigma level.
lib.import = {}
setmetatable(lib.import, getmetatable(lib))
lib.import.line_regexp = {}
-------------------
-- General tools --
-------------------
function lib.import.unpack_multilevel(multilevel, sublevel_number, format)
assert_type(multilevel, "lib.import.unpack_multilevel first argument", 2, "string")
assert_type(sublevel_number, "lib.import.unpack_multilevel second argument", 2, "nil", "positive integer")
local current_level_number = 0
local level = ""
-- search the correct sublevel by pattern matching, line for line
local in_level = false
for line in string.gmatch(multilevel, "([^\r\n\|]*)[\r\n\|]+") do
local start_match, end_match = string.find(line, lib.import.line_regexp[format])
if (start_match == 1) and (end_match == string.len(line)) then
if not in_level then
-- we just entered a new level
current_level_number = current_level_number + 1
in_level = true
end
if current_level_number == (sublevel_number or 1) then
level = level..line.."\n"
end
else
in_level = false
end
end
assert_bool(level ~= "", "lib.import.unpack_multilevel: Multilevel holds less than "..sublevel_number.." levels!", 2)
return level
end
function lib.import.uncompress_rle(level, attribs)
assert_type(level, "lib.import.uncompress_rle first argument", 2, "string")
assert_type(attribs, "lib.import.uncompress_rle second argument", 2, "nil", "table")
local uncompressed = ""
local rle_counter = nil
local error_on_multiple = (attribs or {}).error_on_multiple
for j = 1, string.len(level) do
local ch = string.sub(level, j, j)
if tonumber(ch) then
-- add number for runlength encoding
rle_counter = 10 * (rle_counter or 0) + tonumber(ch)
else
if error_on_multiple and ((rle_counter or 1) > 1) then
-- check whether character is allowed as multiple
if string.find(ch, error_on_multiple) then
error("lib.import.uncompress_rle: Level uses rle-compression on an invalid character.", 2)
end
end
uncompressed = uncompressed .. string.rep(ch, rle_counter or 1)
rle_counter = nil
end
end
return uncompressed
end
function lib.import.string_replace(level, old_string, new_string)
return string.gsub(level, old_string, function(s) return new_string end)
end
function lib.import.string_remove_multiples(level, ch)
local result = level
while string.find(result, ch..ch) do
result = lib.import.string_replace(result, ch..ch, ch)
end
return result
end
-- When using level_to_map, make sure in advance that the level ends
-- with a proper line ending, and only one line ending.
function lib.import.level_to_map(level, line_ending, default_key)
assert_type(level, "lib.import.level_to_map first argument", 2, "string")
assert_type(line_ending, "lib.import.level_to_map second argument", 2, "nil", "non-empty string")
assert_type(default_key, "lib.import.level_to_map third argument", 2, "nil", "non-empty string")
local premap = {}
local reg_exp_line = "(.-)" .. (line_ending or "\n")
string.gsub(level, reg_exp_line, function (s)
table.insert(premap, s)
end)
return wo:newMap(default_key or " ", premap)
end
----------------------------------------
-- Specific import data and functions --
----------------------------------------
--------------------------
-- Sokoban level format --
--------------------------
-- Sokoban level files can be very different - they can use
-- runlength encoding and multilevel files. Sometimes, "|"
-- is used as line ending instead of or together with "\n".
-- " ", "_" and "-" can all represent space. Sometimes, the
-- outside is filled with " ", then again with "#" (what we
-- call "redundant walls"). Finally, line width can vary.
-- We use a slightly generalized version, to include
-- chessoban levels. Allowed characters are:
-- - _ space space
-- # wall
-- . goal
-- $ * box, box with goal
-- n N st_chess, st_chess with goal
-- @ + player, player with goal
-- The returned map will use " " for inside space, "-" for
-- outside space, default key is " ".
lib.import.line_regexp["sokoban"] =
"[ \-\#\_\$\.@\*0-9Nn\+]*" -- all allowed characters except line ending
.. "[\#\$\.@\*Nn\+]+" -- at least one non-space character
.. "[ \-\#\_\$\.@\*0-9Nn\+]*" -- again all allowed characters except line ending
.. "[\r]?" -- maybe a carriage return from line ending
function lib.import.map_sokoban(multilevel, sublevel_number, keylength_one)
assert_type(multilevel, "lib.import.map_sokoban first argument", 2, "non-empty string")
assert_type(sublevel_number, "lib.import.map_sokoban second argument", 2, "nil", "positive integer")
local level
level = lib.import.unpack_multilevel(multilevel .. "\n", sublevel_number or 1, "sokoban")
level = lib.import.uncompress_rle(level, {error_on_multiple = "|\n"})
level = lib.import.string_replace(level, "\r\n", "\n")
level = lib.import.string_replace(level, "|", "\n")
level = lib.import.string_remove_multiples(level .. "\n", "\n")
local map = lib.import.level_to_map(level, "\n", " ")
map:replace("_")
map:replace("-")
map:replace_outside(" ", "-")
-- Remove redundant walls by outside:
-- A wall is redundant, if it is surrounded by "-" or "#".
-- In this case, it can be replaced by "-".
map.defaultkey = "-"
map[map:match({{po(0,0), "#"}, {NEIGHBORS_8, "-", "#"}})] = "-"
map = map:trim()
map.defaultkey = " "
-- MAP now is a ready-to-use keylength-one-map.
-- If KEYLENGTH_ONE is true, we may return the map;
-- otherwise, we resolve the characters "*", "N" and
-- "+", which include triggers.
if keylength_one then
return map
end
twocharmap = map * wo:newMap(" ")
twocharmap:replace(". ", " .")
twocharmap:replace("* ", "$.")
twocharmap:replace("N ", "n.")
twocharmap:replace("+ ", "@.")
return twocharmap
end
---------------------------
-- Wanderer level format --
---------------------------
-- Wanderer is a game originally created by Steven Shipway in 1988.
-- Wanderer level files are uncompressed monolevels with fixed
-- width. The level itself is followed by a short description
-- (title/author/email) in a single line or a line of "#"s. Last
-- line optionally is a number. A Wanderer level knows the
-- following characters (taken from Wanderer's editor):
-- : _ # earth, rock, indestructible rock
-- * - space treasure, alternative space, space
-- O < > ^ falling boulder, arrow from right, arrow from left, balloon
-- ! + B landmine, cage, bomb
-- / \\ deflectors
-- T A X @ teleport, arrival, exit, start
-- M S C ~ big monster, baby monster, time capsule, thingy
lib.import.line_regexp["wanderer"] =
"[ \:\_\#\*\-O\<\>\^\!\+B\/\\TAX@MSC\~]+" -- at least one character
function lib.import.map_wanderer(monolevel)
assert_type(monolevel, "lib.import.map_wanderer first argument", 2, "non-empty string")
-- strip level from text lines
local level = lib.import.unpack_multilevel(monolevel, 1, "wanderer")
local map = lib.import.level_to_map(level, "\n", " ")
-- replace alternative space by space (i.e. default key)
map:replace("-")
return map
end
]]></el:luamain>
<el:i18n>
</el:i18n>
</el:protected>
</el:level>
|
