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#lang racket/base
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(require (for-syntax racket/base syntax/strip-context racket/syntax pollen/world racket/list) pollen/decode pollen/pagetree racket/list pollen/world markdown)
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(provide (all-defined-out) (all-from-out pollen/world))
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(define-for-syntax (split-metas tree)
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(define (meta-matcher x) ; meta has form (define-meta key value)
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(and (list? x) (>= (length x) 3) (eq? (first x) (world:current-define-meta-name))))
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(define matches empty)
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(define rest
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(let loop ([x tree])
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(cond
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[(meta-matcher x)
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(set! matches (cons x matches))
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(loop empty)]
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[(list? x)
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(define-values (new-matches rest) (partition meta-matcher x))
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(set! matches (append new-matches matches))
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(map loop rest)]
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[else x])))
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(let ([meta-key second][meta-value third])
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(values (map meta-key matches) (map meta-value matches) rest)))
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(define-syntax-rule (define+provide-module-begin-in-mode PARSER-MODE-ARG)
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(begin
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(provide (except-out (all-from-out racket/base) #%module-begin)
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(rename-out [pollen-module-begin #%module-begin]))
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(define-syntax (pollen-module-begin stx)
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(syntax-case stx ()
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[(_ EXPR (... ...))
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(let-values ([(meta-keys meta-values expr-without-metas) (split-metas (syntax->datum #'(EXPR (... ...))))])
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(with-syntax ([(EXPR-WITHOUT-METAS (... ...)) (datum->syntax #'(EXPR (... ...)) expr-without-metas)]
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[(KEY (... ...)) (datum->syntax #'(EXPR (... ...)) meta-keys)]
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[(VALUE (... ...)) (datum->syntax #'(EXPR (... ...)) meta-values)]
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[METAS (format-id #'(EXPR (... ...)) "~a" (world:current-meta-export))]
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[META-MOD (format-symbol "~a" (world:current-meta-export))]
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[DOC (format-id #'(EXPR (... ...)) "~a" (world:current-main-export))]
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[DOC-RAW (generate-temporary)]); prevents conflicts with other imported Pollen sources
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(replace-context #'(EXPR (... ...))
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#'(#%module-begin
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(module META-MOD racket/base
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(provide (all-defined-out))
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(define METAS (apply hash (append (list 'KEY VALUE) (... ...)))))
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(module inner pollen/doclang-raw
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DOC-RAW ; positional arg for doclang-raw that sets name of export.
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(require pollen/top pollen/world)
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(provide #%top (all-defined-out) (all-from-out pollen/world))
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EXPR-WITHOUT-METAS (... ...))
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(require 'inner 'META-MOD)
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(define DOC
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(let* ([parser-mode-undefined? (procedure? inner:parser-mode)] ; if undefined, #%top makes it a procedure
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[parser-mode (if parser-mode-undefined? PARSER-MODE-ARG inner:parser-mode)]
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[proc (cond
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[(eq? parser-mode world:mode-pagetree) (λ xs (decode-pagetree xs))]
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[(eq? parser-mode world:mode-markup) root] ; if `root` undefined, it becomes a default tag function
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[(eq? parser-mode world:mode-markdown)
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(λ xs (apply root (apply (compose1 parse-markdown string-append) (map to-string xs))))]
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[else ; for preprocessor output, just make a string
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(λ xs (apply string-append (map to-string xs)))])]
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;; drop leading newlines, as they're often the result of `defines` and `requires`
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[doc-elements (dropf DOC-RAW (λ(ln) (equal? ln "\n")))])
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(apply proc doc-elements)))
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(provide DOC METAS (except-out (all-from-out 'inner) DOC-RAW #%top))))))])))) ; hide internal exports
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