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(module tilemap
*
(import scheme
(chicken io)
(chicken base)
(chicken string)
(chicken pretty-print)
(srfi 1)
expat
defstruct)
(defstruct tileset
tilewidth
tileheight
spacing
tilecount
columns
image)
(defstruct layer
name
width
height
map)
(defstruct object
name
type
x
y
width
height
properties)
(defstruct tilemap
width
height
tilewidth
tileheight
tileset
layers
objects)
(define (maybe-do action)
(lambda (value)
(if (eq? value #f)
#f
(action value))))
(define (attempt action)
(lambda (value)
(or (action value) value)))
(define maybe-string->number (maybe-do (attempt string->number)))
(define (string-alist->alist string-alist)
(map (lambda (pair) (cons (string->symbol (car pair))
(maybe-string->number (cdr pair))))
string-alist))
(define (parse-tilemap string-tilemap)
(let ((parser (expat:make-parser))
(tags '())
(tilemap (make-tilemap 0 0 0 0 '() '() '()))
(layer '()))
(expat:set-start-handler! parser
(lambda (tag attrs)
(let ((symbol-attrs (string-alist->alist attrs)))
(cond ((string=? tag "map")
(tilemap-width-set! tilemap (alist-ref 'width symbol-attrs))
(tilemap-height-set! tilemap (alist-ref 'height symbol-attrs))
(tilemap-tilewidth-set! tilemap (alist-ref 'tilewidth symbol-attrs))
(tilemap-tileheight-set! tilemap (alist-ref 'tileheight symbol-attrs)))
((string=? tag "tileset")
(tilemap-tileset-set! tilemap (alist->tileset symbol-attrs)))
((string=? tag "layer")
(set! layer (alist->layer attrs)))
((string=? tag "object")
(tilemap-objects-set! tilemap (cons (alist->object symbol-attrs)
(tilemap-objects tilemap)))))
(set! tags (cons tag tags)))))
(expat:set-end-handler! parser (lambda (tag)
(when (string=? tag "layer")
(tilemap-layers-set! tilemap
(cons layer (tilemap-layers tilemap)))
(set! layer '()))
(set! tags (cdr tags))))
(expat:set-character-data-handler! parser (lambda (line)
(when (string=? (car tags) "data")
(let ((txt (string-chomp line)))
(when (not (string=? txt ""))
(layer-map-set! layer (append
(or (layer-map layer) '())
(list (map string->number
(string-split txt ","))))))))))
(expat:parse parser string-tilemap)
tilemap))
(define (load-tilemap file-name)
(call-with-input-file file-name
(lambda (port)
(parse-tilemap (read-string port))
;; TODO: Open and parse the tileset
)))
(when #f
(let ((txt "<?xml version='1.0' encoding='UTF-8'?>
<map version='1.10' tiledversion='1.11.0' orientation='orthogonal' renderorder='right-down' width='40' height='30' tilewidth='16' tileheight='16' infinite='0' nextlayerid='8' nextobjectid='5'>
<tileset firstgid='1' source='monochrome_transparent.tsx'/>
<layer id='3' name='ground' width='40' height='30'>
<data encoding='csv'>
0,0,0,0,168,169,0,0,0,0,
844,0,0,0,0,0,845,546,546,546,
</data>
</layer>
<objectgroup id='7' name='entities'>
<object id='2' name='player' type='Player' gid='29' x='182' y='350.5' width='16' height='16'/>
<object id='3' name='hint' type='Text' x='98.5' y='432.5' width='197' height='78'>
<properties>
<property name='text' value='hit enter to start a macro'/>
</properties>
</object>
<object id='4' name='goal' type='Goal' x='560.935' y='288.641' width='16' height='16'/>
</objectgroup>
</map>
"))
(tileset-source (tilemap-tileset (parse-tilemap txt))))
)
) ;; End tilemap module
|
