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typesetting/quad/utils-typed.rkt

29 lines
1.3 KiB
Racket

#lang typed/racket/base
(require sugar/list)
(require (for-syntax racket/syntax racket/base) racket/string racket/list sugar/debug racket/bool hyphenate racket/function math/flonum)
(require "quads-typed.rkt" "world-typed.rkt" "measure-typed.rkt")
;; predicate for use below
(: list-of-mergeable-attrs? (Any . -> . Boolean))
(define (list-of-mergeable-attrs? xs)
(and (list? xs) (andmap (λ(x) (or (quad? x) (quad-attrs? x) (hashable-list? x))) xs)))
;; faster than (listof pair?)
(: pairs? (Any . -> . Boolean))
(define (pairs? x) (and (list? x) (andmap pair? x)))
;; push together multiple attr sources into one list of pairs.
;; mostly a helper function for the two attr functions below.
(: join-attrs ((Listof (U Quad QuadAttrs)) . -> . QuadAttrs))
(define (join-attrs quads-or-attrs-or-lists)
; (list-of-mergeable-attrs? . -> . pairs?)
(append-map hash->list (filter-not false? (map (λ(x)
(cond
[(quad? x) (quad-attrs x)]
[(quad-attrs? x) x]
[(hashable-list? x) (quadattrs x)]
[else #f])) quads-or-attrs-or-lists))))