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