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typesetting/quad2/draw.rkt

56 lines
2.5 KiB
Racket

#lang debug racket/base
(require racket/list
racket/string
racket/format
racket/match
"quad.rkt"
"pipeline.rkt"
"struct.rkt"
"layout.rkt"
"constants.rkt")
(provide (all-defined-out))
(define-pass (make-drawing-insts qs)
#:pre (list-of has-position?)
#:post (list-of $drawing-inst?)
(apply append
(let ([current-font #false])
(for/list ([q (in-list qs)])
(cond
[(eq? boq q) (list ($doc-start))]
[(eq? eoq q) (list ($doc-end))]
[(bop-quad? q) (list ($page-start (quad-ref q :page-width) (quad-ref q :page-height)))]
[(eop-quad? q) (list ($page-end))]
[(quad? q)
(append
(match (quad-ref q :font-path)
[(== current-font) null]
[font-path
(set! current-font font-path)
(list ($font font-path))])
(if (pair? (quad-elems q))
(list ($move (quad-posn q)) ($text (char->integer (car (string->list (car (quad-elems q)))))))
null))]
[else (error 'render-unknown-thing)])))))
(define valid-tokens '(doc-start doc-end page-start page-end text move set-font))
(define-pass (stackify xs)
#:pre (list-of $drawing-inst?)
#:post string?
(define move-points (map $move-posn (filter $move? xs)))
(define xmax (if (pair? move-points) (add1 (apply max (map $point-x move-points))) 0))
(define ymax (if (pair? move-points) (add1 (apply max (map $point-y move-points))) 0))
(string-join
(for/list ([x (in-list xs)])
(string-join (map ~a (match x
;; TODO: embed these code-generating functions
;; as properties of the structs
[($move ($point x y)) (list y x 'move)]
[($text charint) (list charint 'text)]
[($font path-string) (list path-string 'set-font)]
[($doc-start) '(doc-start)]
[($doc-end) '(doc-end)]
[($page-start width height) (list height width 'page-start)]
[($page-end) '(page-end)]
[_ (error 'unknown-drawing-inst)])) " ")) "\n"))