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pollen/main-base.rkt

67 lines
3.9 KiB
Racket

#lang racket/base
(require (for-syntax racket/base racket/syntax pollen/world) pollen/world)
(provide (all-defined-out) (all-from-out pollen/world))
(define-syntax-rule (define+provide-module-begin-in-mode MODE-ARG)
(begin
(provide (except-out (all-from-out racket/base) #%module-begin)
(rename-out [pollen-module-begin #%module-begin]))
(define-syntax (pollen-module-begin stx)
(syntax-case stx ()
[(_ EXPR (... ...))
(with-syntax ([DOC (datum->syntax stx (world:current-main-export))]
[METAS (datum->syntax stx (world:current-meta-export))]
[META (datum->syntax stx (world:current-meta-tag-name))]
[INNER (datum->syntax stx ''inner)])
#'(#%module-begin
(module inner pollen/doclang-raw
;; doclang_raw is a version of scribble/doclang with the decoder disabled
;; first three lines are positional arguments for doclang-raw
doc-raw ; id of export
(λ(x) x) ; post-process function
() ; prepended exprs
;; Change behavior of undefined identifiers with #%top
;; Get project values from world
(require pollen/top pollen/world)
(provide (all-defined-out) (all-from-out pollen/top pollen/world))
EXPR (... ...))
(require INNER 'inner pollen/metas) ; import inner twice: INNER for external use, 'inner for internal
;; in an inline module, reader-here-path and parser-mode are undefined
;; (because there's no reader)
;; but they'll become tag functions courtesy of #%top
;; so that's how we can detect if they are undefined
(define here-path (if (procedure? inner:reader-here-path)
"anonymous-module"
inner:reader-here-path))
(define parser-mode (if (procedure? inner:parser-mode)
MODE-ARG
inner:parser-mode))
;; set up the DOC export
(define doc-elements (if (list? doc-raw) ; discard all newlines at front of file
((dynamic-require 'racket/list 'dropf) doc-raw (λ(i) (equal? i "\n")))
doc-raw)) ; single line
(define doc-with-metas (list* 'placeholder-root `(META (here-path ,here-path)) doc-elements))
(define-values (doc-without-metas METAS) (split-metas-to-hash doc-with-metas))
(define DOC
(let ([proc (cond
[(equal? parser-mode world:mode-pagetree)
(λ xs ((dynamic-require 'pollen/pagetree 'decode-pagetree) xs))]
;; 'root is the hook for the decoder function.
;; If it's not a defined identifier, it just hits #%top and becomes `(root ,@body ...)
[(equal? parser-mode world:mode-markup) root]
[(equal? parser-mode world:mode-markdown)
(λ xs (apply root (apply (compose1 (dynamic-require 'markdown 'parse-markdown) string-append)
(map (dynamic-require 'pollen/decode 'to-string) xs))))]
;; for preprocessor output, just make a string.
[else (λ xs (apply string-append (map (dynamic-require 'pollen/decode 'to-string) xs)))])]
[doc-elements-without-metas (cdr doc-without-metas)])
(apply proc doc-elements-without-metas)))
;; hide the exports that were only for internal use.
(provide DOC METAS (except-out (all-from-out INNER) doc-raw #%top))))]))))