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88 lines
3.1 KiB
Racket
88 lines
3.1 KiB
Racket
3 years ago
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#lang debug racket/base
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(require racket/contract racket/function rackunit racket/list "pass.rkt" "drawing.rkt" "quad.rkt")
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(provide quad-compile)
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(define/contract (posn-add p0 p1)
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($point? $size? . -> . $point?)
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($point (+ ($point-x p0) ($size-width p1)) (+ ($point-y p0) ($size-height p1))))
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(define/contract (size char)
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($quad? . -> . $size?)
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($size 1 1))
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(define/contract (advance char)
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($quad? . -> . $size?)
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($size 1 0))
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(define/contract (quadify str)
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(string? . -> . (listof $quad?))
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(for/list ([c (in-string str)])
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($quad #f c)))
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(define/contract (make-compiler . passes)
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(() #:rest (listof pass/c)
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. ->* . (any/c . -> . (listof any/c)))
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(apply compose1 (reverse (cons quadify passes))))
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(define (min-x rect) ($point-x ($rect-origin rect)))
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(define (width rect) ($size-width ($rect-size rect)))
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(define (max-x rect) (+ (min-x rect) (width rect)))
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(define (min-y rect) ($point-y ($rect-origin rect)))
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(define (height rect) ($size-height ($rect-size rect)))
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(define (max-y rect) (+ (min-y rect) (height rect)))
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(define/contract (rect-contains-point? rect pt)
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($rect? $point? . -> . boolean?)
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(and (<= (min-x rect) ($point-x pt) (max-x rect))
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(<= (min-y rect) ($point-y pt) (max-y rect))))
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(define/contract (rect-contains-rect? outer inner)
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($rect? $rect? . -> . boolean?)
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(and (rect-contains-point? outer ($rect-origin inner))
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(rect-contains-point? outer ($point (max-x inner) (max-y inner)))))
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(define (has-position? q) (not (eq? ($quad-posn q) #false)))
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(define-pass (layout qs)
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#:precondition (λ (qs) (and (list? qs) (andmap (λ (q) (not (has-position? q))) qs)))
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#:postcondition (λ (qs) (and (list? qs) (andmap has-position? qs)))
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(define frame ($rect ($point 0 0) ($size (current-wrap-width) 30)))
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(define (quad-fits? q posn)
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(define q-size (size q))
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(define quad-rect ($rect posn q-size))
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(and (rect-contains-rect? frame quad-rect) posn))
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(for/fold ([posn ($point 0 0)]
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#:result qs)
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([q (in-list qs)])
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(define first-posn-on-next-line ($point 0 (add1 ($point-y posn))))
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(define winning-posn (or (ormap (λ (posn) (quad-fits? q posn)) (list posn first-posn-on-next-line)) (error 'no-posn-that-fits)))
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(set-$quad-posn! q winning-posn)
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(posn-add winning-posn (advance q))))
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(define-pass (make-drawing-insts qs)
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#:precondition (λ (qs) (andmap has-position? qs))
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#:postcondition (λ (qs) (andmap $drawing-inst? qs))
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(flatten
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(list ($doc 'start) ($page 'start)
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(for/list ([q (in-list qs)])
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(cond
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[($quad? q)
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(list ($move ($quad-posn q)) ($text ($quad-char q)))]
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[else (error 'render-unknown-thing)]))
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($page 'end) ($doc 'end))))
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(define quad-compile (make-compiler layout make-drawing-insts))
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#;(check-equal?
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(list
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($quad ($point 0 0) #\H)
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($quad ($point 1 0) #\e)
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($quad ($point 2 0) #\l)
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($quad ($point 3 0) #\l)
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($quad ($point 4 0) #\o)
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($quad ($point 0 1) #\space)
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($quad ($point 1 1) #\w)
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($quad ($point 2 1) #\o)
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($quad ($point 3 1) #\r)
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($quad ($point 4 1) #\l)
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($quad ($point 0 2) #\d)))
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