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#lang racket/base
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(require (for-syntax racket/base
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syntax/kerncase))
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(provide (except-out (all-from-out racket/base) #%module-begin)
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(rename-out [*module-begin #%module-begin]))
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;; Module wrapper ----------------------------------------
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(define-syntax (*module-begin stx)
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(syntax-case stx ()
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[(_ id . body)
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(with-syntax ([post-process #'(λ(x) x)]
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[exprs #'()])
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#'(#%module-begin
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(doc-begin id post-process exprs . body)))]))
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(define-syntax (doc-begin stx)
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(syntax-case stx ()
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[(_ m-id post-process (expr ...))
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#`(begin
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(define m-id (post-process (list . #,(reverse (syntax->list #'(expr ...))))))
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(provide m-id))]
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[(_ m-id post-process exprs . body)
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;; `body' probably starts with lots of string constants; it's
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;; slow to trampoline on every string, so do them in a batch
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;; here:
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(let loop ([body #'body]
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[accum null])
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(syntax-case body ()
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[(s . rest)
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(string? (syntax-e #'s))
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(loop #'rest (cons #'s accum))]
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[()
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(with-syntax ([(accum ...) accum])
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#`(doc-begin m-id post-process (accum ... . exprs)))]
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[(body1 . body)
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(with-syntax ([exprs (append accum #'exprs)])
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(let ([expanded (local-expand
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#'body1 'module
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(append (kernel-form-identifier-list)
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(syntax->list #'(provide
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require
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#%provide
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#%require))))])
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(syntax-case expanded (begin)
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[(begin body1 ...)
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#`(doc-begin m-id post-process exprs body1 ... . body)]
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[(id . rest)
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(and (identifier? #'id)
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(ormap (lambda (kw) (free-identifier=? #'id kw))
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(syntax->list #'(require
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provide
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define-values
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define-syntaxes
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begin-for-syntax
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module
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module*
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#%require
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#%provide))))
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#`(begin #,expanded (doc-begin m-id post-process exprs . body))]
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[_else
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#`(doc-begin m-id post-process
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((pre-part #,expanded body1) . exprs)
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. body)])))]))]))
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(define-syntax (pre-part stx)
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(syntax-case stx ()
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[(_ s e)
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(if (string? (syntax-e #'s))
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#'s
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(with-syntax ([src (syntax-source #'e)]
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[line (syntax-line #'e)]
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[col (syntax-column #'e)]
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[pos (syntax-position #'e)]
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[span (syntax-column #'e)])
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#'(check-pre-part e (vector 'src 'line 'col 'pos 'span))))]))
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(define (check-pre-part v s)
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v)
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