You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
typesetting/quad2/attr.rkt

77 lines
3.1 KiB
Racket

#lang debug racket/base
(require racket/match
racket/hash
racket/list
racket/string
"dimension.rkt"
"pipeline.rkt"
"quad.rkt")
(provide (all-defined-out))
(define (do-attr-iteration qs #:which-key which-arg #:value-proc proc)
(define key-predicate
(match which-arg
[(? symbol? sym) (λ (k) (eq? k sym))]
[(and (list (? symbol?) ...) syms) (λ (k) (memq k syms))]
[(? procedure? pred) pred]
[other (raise-argument-error 'do-attr-iteration "key predicate" other)]))
(define attrs-seen (make-hasheq))
(for ([q (in-list qs)])
(define attrs (quad-attrs q))
(hash-ref! attrs-seen attrs
(λ ()
(for ([k (in-hash-keys attrs)]
#:when (key-predicate k))
(hash-update! attrs k (λ (val) (proc val attrs))))
#t)))
qs)
;; TODO: make real `has-case-sensitive-value?`
(define (has-case-sensitive-value? x) #false)
(define-pass (downcase-attr-values qs)
;; make attribute values lowercase, unless they're case-sensitive
;; so we can check them more easily later.
;; in principle we could do this earlier and recursively process a single quad
;; rather than linearized quads
;; it would be faster because there are fewer copies of the attr hashes,
;; so we do fewer tests
;; but let's stay with the pipeline policy of operating on flat lists of quads
#:pre (list-of quad?)
#:post (list-of quad?)
(do-attr-iteration qs
#:which-key (λ (k) (not (has-case-sensitive-value? k)))
#:value-proc (λ (val attrs) (string-downcase val))))
;; TODO: make real `takes-path?`
(define (takes-path? x) (memq x '(ps)))
(define-pass (complete-attr-paths qs)
#:pre (list-of quad?)
#:post (list-of quad?)
;; convert every pathlike thing to a complete path (well, path string, because it's inside an attr)
;; so we don't get tripped up later by relative paths
;; relies on `current-directory` being parameterized to source file's dir
(do-attr-iteration qs
#:which-key takes-path?
#:value-proc (λ (val attrs) (path->string (path->complete-path val)))))
;; TODO: make real `takes-dimension-string?`
(define (takes-dimension-string? x) (memq x '(dim)))
(define-pass (parse-dimension-strings qs)
#:pre (list-of quad?)
#:post (list-of quad?)
;; certain attributes can be "dimension strings", which are strings like "3in" or "4.2cm"
;; we parse them into the equivalent measurement in points.
(do-attr-iteration qs
#:which-key takes-dimension-string?
#:value-proc (λ (val attrs) (parse-dimension val attrs))))
(module+ test
(require rackunit)
(define q (make-quad #:attrs (make-hasheq '((foo . "BAR")(ps . "file.txt")(dim . "2in")))))
(define qs (list q))
(check-equal? (quad-ref (car (downcase-attr-values qs)) 'foo) "bar")
(check-true (complete-path? (string->path (quad-ref (car (complete-attr-paths qs)) 'ps))))
(check-equal? (quad-ref (car (parse-dimension-strings qs)) 'dim) 144))