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pollen/main-base.rkt

117 lines
6.8 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))
;; for anything defined in pollen source file
(provide (all-defined-out))
body-exprs (... ...))
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(require 'inner)
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;; if reader-here-path is undefined, it will become a proc courtesy of #%top
;; therefore that's how we can detect if it's undefined
(define here-path (if (procedure? reader-here-path) "anonymous-module" reader-here-path))
;; set the parser mode based on reader mode
;; todo: this won't work with inline submodules
(define parser-mode
(if (not (procedure? reader-mode))
(if (equal? reader-mode world:mode-auto)
(let* ([file-ext-pattern (pregexp "\\w+$")]
[here-ext (string->symbol (car (regexp-match file-ext-pattern here-path)))])
(cond
[(equal? here-ext world:pagetree-source-ext) world:mode-pagetree]
[(equal? here-ext world:markup-source-ext) world:mode-markup]
[(equal? here-ext world:markdown-source-ext) world:mode-markdown]
[else world:mode-preproc]))
reader-mode)
mode-arg))
;; 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
(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)))
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(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))
(define doc-with-metas
(let ([doc-raw (if (equal? parser-mode world:mode-markdown)
(apply (compose1 (dynamic-require 'markdown 'parse-markdown) string-append) doc-raw)
doc-raw)])
`(placeholder-root
,@(cons (meta 'here-path: here-path)
;; cdr strips initial linebreak, but make sure doc-raw isn't blank
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(if (and (list? doc-raw) (> (length doc-raw) 0) (equal? (car doc-raw) "\n")) (cdr doc-raw) doc-raw)))))
(define-values (doc-without-metas metas) (split-metas-to-hash doc-with-metas))
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;; 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 ...)
[(or (equal? parser-mode world:mode-markup)
(equal? parser-mode world:mode-markdown)) root]
;; 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))
;; for output in DrRacket
(module+ main
(if (equal? parser-mode world:mode-preproc)
(display doc)
(print doc)))))]))))]))