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pollen/main-base.rkt

98 lines
5.7 KiB
Racket

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#lang racket/base
(require (for-syntax racket/base racket/syntax) pollen/world)
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(provide (all-defined-out) (all-from-out pollen/world))
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(define-syntax (define+provide-module-begin-in-mode stx)
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(syntax-case stx ()
[(_ mode-arg)
(with-syntax ([new-module-begin (format-id stx "new-module-begin")])
#'(begin
(provide (except-out (all-from-out racket/base) #%module-begin)
(rename-out [new-module-begin #%module-begin]))
(define-syntax (new-module-begin stx-arg)
(syntax-case stx-arg ()
[(_ body-exprs (... ...))
(syntax-protect
#'(#%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-from-out pollen/top pollen/world))
(provide (all-defined-out))
body-exprs (... ...))
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(require 'inner)
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;; 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))
;; Split out the metas.
(define (split-metas-to-hash x)
(define (meta-key x) (car (caadr x)))
(define (meta-value x) (cadr (caadr x)))
(define is-meta-element? (λ(x) (and (list? x) ; possible txexpr
(>= (length x) 2) ; = tag + attribute + other elements (which are ignored)
(equal? 'meta (car x)) ; tag is 'meta
(symbol? (meta-key x)) ; attribute key is symbol
(string? (meta-value x))))) ; attribute value is string
(define (splitter x)
(define meta-acc null)
(define (split-metas x)
(cond
[(list? x) (define-values (new-metas rest) (values (filter is-meta-element? x) (filter (compose1 not is-meta-element?) x)))
(set! meta-acc (append new-metas meta-acc))
(map split-metas rest)]
[else x]))
(define result (split-metas x))
(values result meta-acc))
(define-values (doc-without-metas meta-elements) (splitter x))
(define meta-element->assoc (λ(x) (let ([key (meta-key x)][value (meta-value x)]) (cons key value))))
(define metas (make-hash (map meta-element->assoc meta-elements)))
(values doc-without-metas metas))
(require racket/list)
(define doc-with-metas
`(placeholder-root
,@(cons (meta 'here-path: here-path)
(if (list? doc-raw)
(dropf doc-raw (λ(i) (equal? i "\n"))) ; discard all newlines at front of file
doc-raw))))
(define-values (doc-without-metas metas) (split-metas-to-hash doc-with-metas))
;; set up the 'doc export
(require pollen/decode)
(define doc (apply (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 to-string xs))))]
;; for preprocessor output, just make a string.
[else (λ xs (apply string-append (map to-string xs)))]) ; default mode is preprocish
(cdr doc-without-metas))) ;; cdr strips placeholder-root tag
(provide metas doc
;; hide the exports that were only for internal use.
(except-out (all-from-out 'inner) doc-raw #%top))))]))))]))