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pollen/pollen/private/main-base.rkt

80 lines
4.0 KiB
Racket

#lang racket/base
(require (for-syntax racket/base racket/syntax "../setup.rkt" "split-metas.rkt")
"to-string.rkt" "../pagetree.rkt" "splice.rkt" "../setup.rkt")
(provide (except-out (all-from-out racket/base) #%module-begin)
(rename-out [dialect-module-begin #%module-begin]))
;; PARSER-MODE-FROM-READER is used when Pollen is invoked as a specific dialect #lang, and the expander is the generic `pollen/main`.
;; PARSER-MODE-FROM-EXPANDER is used when Pollen is invoked through an inline submodule,
;; and the expander is a specific dialect: `pollen/markup`, `pollen/pre`, etc.
;; they only differ in the `pollen/main` dialect, where the reader infers the dialect from the file extension.
(define-syntax-rule (dialect-module-begin PARSER-MODE-FROM-EXPANDER READER-SUBMOD)
(#%module-begin
(require racket/base)
(provide (except-out (all-from-out racket/base) #%module-begin)
(rename-out [pmb #%module-begin]))
(define-syntax (pmb stx)
(syntax-case stx ()
[(_ . EXPRS) (with-syntax ([EXPRS (syntax-property #'EXPRS 'parser-mode-from-expander 'PARSER-MODE-FROM-EXPANDER)])
#'(pollen-module-begin . EXPRS))]))
READER-SUBMOD))
(define (make-parse-proc parser-mode root-proc)
(define (stringify xs) (apply string-append (map to-string xs)))
(cond
[(eq? parser-mode default-mode-pagetree) decode-pagetree]
[(eq? parser-mode default-mode-markup) (λ (xs) (apply root-proc (remove-voids xs)))]
[(eq? parser-mode default-mode-markdown)
(λ (xs) (let* ([xs (stringify xs)]
[xs ((dynamic-require 'markdown 'parse-markdown) xs)]
[xs (map strip-empty-attrs xs)])
(apply root-proc xs)))]
[else stringify])) ; preprocessor mode
(define (strip-leading-newlines doc)
;; drop leading newlines, as they're often the result of `defines` and `requires`
(or (memf (λ (ln) (not (equal? ln (setup:newline)))) doc) null))
(define-syntax (pollen-module-begin stx)
(syntax-case stx ()
[(_ . EXPRS)
(let-values ([(meta-hash exprs-without-metas) (split-metas (syntax->datum #'EXPRS) (setup:define-meta-name))])
(with-syntax (;; 'parser-mode-from-reader will be #f for an inline submodule
[PARSER-MODE-FROM-READER (syntax-property stx 'parser-mode-from-reader)]
[PARSER-MODE-FROM-EXPANDER (syntax-property #'EXPRS 'parser-mode-from-expander)]
[META-HASH meta-hash]
[EXPRS-WITHOUT-METAS exprs-without-metas]
[METAS-ID (setup:meta-export)]
[META-MOD-ID (setup:meta-export)]
[ROOT-ID (setup:main-root-node)]
[DOC-ID (setup:main-export)]
;; prevents conflicts with other imported Pollen sources
[DOC-RAW (datum->syntax #'here (syntax->datum (generate-temporary 'pollen-)))])
#'(#%module-begin
(require pollen/top) ; we could get this via 'inner, but then we'd have to avoid exporting it
(module META-MOD-ID racket/base
(provide METAS-ID)
(define METAS-ID META-HASH))
(module inner pollen/private/doclang-raw
DOC-RAW ; positional arg for doclang-raw that sets name of export
(require pollen/top pollen/core pollen/setup (submod ".." META-MOD-ID))
(provide (all-defined-out) METAS-ID)
. EXPRS-WITHOUT-METAS)
(require 'inner)
(define DOC-ID
;; parser-mode must be resolved at runtime, not compile time
(let* ([parser-mode (or 'PARSER-MODE-FROM-READER PARSER-MODE-FROM-EXPANDER)]
[proc (make-parse-proc parser-mode ROOT-ID)]
[doc-elements (strip-leading-newlines DOC-RAW)]
[doc-elements-spliced (splice doc-elements (setup:splicing-tag))])
(proc doc-elements-spliced)))
(provide DOC-ID (except-out (all-from-out 'inner) DOC-RAW)))))]))