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pollen/pmap-decode.rkt

57 lines
2.7 KiB
Racket

#lang racket/base
(require racket/list racket/string racket/contract racket/match racket/set)
(require "tools.rkt" "world.rkt" "decode.rkt")
(module+ test (require rackunit))
(provide (all-defined-out))
;; These functions need to be separated so that they can be accessed by pollen parser (in main.rkt)
;; Other pmap functions are in pmap.rkt.
;; pmap decoder takes pmap source and returns a full pmap structure.
;; recursively processes map, converting map locations & their parents into xexprs of this shape:
;; '(location ((parent "parent")))
(define/contract (add-parents x [parent empty])
((tagged-xexpr?) (xexpr-tag?) . ->* . pmap?)
(match x
;; this pattern signifies next level in hierarchy
;; where first element is new parent, and rest are children.
[(list (? xexpr-tag? next-parent) children ...)
(let-values ([(tag attr _) (break-tagged-xexpr (add-parents next-parent parent))])
;; xexpr with tag as name, parent as attr, children as elements with tag as next parent
(make-tagged-xexpr tag attr (map (λ(c) (add-parents c tag)) children)))]
;; single map entry: convert to xexpr with parent
[else (make-tagged-xexpr (->symbol x) (make-xexpr-attr POLLEN_MAP_PARENT_KEY (->string parent)))]))
(module+ test
(define test-pmap-main `(pmap-main "foo" "bar" (one (two "three"))))
(check-equal? (pmap-root->pmap test-pmap-main)
`(pmap-main ((,POLLEN_MAP_PARENT_KEY "")) (foo ((,POLLEN_MAP_PARENT_KEY "pmap-main"))) (bar ((,POLLEN_MAP_PARENT_KEY "pmap-main"))) (one ((,POLLEN_MAP_PARENT_KEY "pmap-main")) (two ((,POLLEN_MAP_PARENT_KEY "one")) (three ((,POLLEN_MAP_PARENT_KEY "two"))))))))
;; this sets default input for following functions
(define/contract (pmap-root->pmap tx)
(tagged-xexpr? . -> . pmap?)
(add-parents tx))
(define/contract (pmap-source-decode . elements)
(() #:rest (and/c
;; todo: how to put these contracts under a let?
;; all elements must be valid pmap keys
(flat-named-contract 'valid-pmap-keys
(λ(e) (andmap (λ(x) (pmap-key? #:loud #t x))
(filter-not whitespace? (flatten e)))))
;; they must also be unique
(flat-named-contract 'unique-pmap-keys
(λ(e) (elements-unique? #:loud #t
(map ->string ; to make keys comparable
(filter-not whitespace? (flatten e)))))))
. ->* . pmap?)
(pmap-root->pmap (decode (cons 'pmap-root elements)
#:xexpr-elements-proc (λ(xs) (filter-not whitespace? xs))
)))