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.
pollen/main.rkt

81 lines
3.5 KiB
Racket

This file contains invisible Unicode characters!

This file contains invisible Unicode characters that may be processed differently from what appears below. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to reveal hidden characters.

#lang racket/base
(provide (except-out (all-from-out racket/base) #%module-begin)
(rename-out [new-module-begin #%module-begin]))
(define-syntax-rule (new-module-begin body-exprs ...)
(#%module-begin
(module inner pollen/lang/doclang_raw
;; first three lines are positional arguments for doclang_raw
;; doclang_raw is a version of scribble/doclang with the decoder disabled
main-raw ; id of export
(λ(x) x) ; post-process function
() ; prepended exprs
(require pollen/lang/inner-lang-helper)
(require-and-provide-project-require-files) ; only works if current-directory is set correctly
;; Change behavior of undefined identifiers with #%top
(require pollen/top)
(provide (all-from-out pollen/top))
;; Get project values
(require pollen/world)
(provide (all-from-out pollen/world))
;; Build 'inner-here-path and 'inner-here
(define (here-path->here here-path)
(path->string (path-replace-suffix (pollen-find-relative-path (CURRENT_PROJECT_ROOT) here-path) "")))
(define inner-here-path (get-here-path))
(define inner-here (here-path->here inner-here-path))
(provide (all-defined-out))
body-exprs ...)
(require 'inner)
;; Split out the metas.
(require txexpr)
(define (split-metas-to-hash tx)
;; return tx without metas, and meta hash
(define is-meta-element? (λ(x) (and (txexpr? x) (equal? 'meta (car x)))))
(define-values (main-without-metas meta-elements)
(splitf-txexpr tx is-meta-element?))
(define meta-element->assoc (λ(x) (let ([key (car (caadr x))][value (cadr (caadr x))]) (cons key value))))
(define metas (make-hash (map meta-element->assoc meta-elements)))
(values main-without-metas metas))
(define main-txexpr `(placeholder-root
,@(cons (meta 'here: inner-here)
(cons (meta 'here-path: inner-here-path)
;; cdr strips initial linebreak, but make sure main-raw isn't blank
(if (and (list? main-raw) (> 0 (length main-raw))) (cdr main-raw) main-raw)))))
(define-values (main-without-metas metas) (split-metas-to-hash main-txexpr))
;; set up the 'main export
(require pollen/decode)
(define here-ext (car (regexp-match #px"\\w+$" inner-here-path)))
(define wants-decoder? (member here-ext (map to-string DECODABLE_EXTENSIONS)))
(define main (apply (cond
[(equal? here-ext "ptree") (λ xs (decode (cons PTREE_ROOT_NODE xs)
#:xexpr-elements-proc (λ(xs) (filter (compose1 not (bound/c whitespace?)) xs))))]
;; 'root is the hook for the decoder function.
;; If it's not a defined identifier, it just hits #%top and becomes `(root ,@body ...)
[wants-decoder? root]
;; for preprocessor output, just make a string.
[else (λ xs (apply string-append (map to-string xs)))])
(cdr main-without-metas))) ;; cdr strips placeholder-root tag
(provide metas main
;; hide the exports that were only for internal use.
(except-out (all-from-out 'inner) inner-here inner-here-path main-raw #%top))
;; for output in DrRacket
(module+ main
(if wants-decoder?
(print main)
(display main)))))