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133 lines
6.3 KiB
Racket
133 lines
6.3 KiB
Racket
#lang racket/base
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(require (for-syntax racket/base
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syntax/path-spec
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racket/private/increader
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compiler/cm-accomplice))
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(provide include-without-lang-line)
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(define-syntax (do-include stx)
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(syntax-case stx ()
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[(_ orig-stx ctx loc fn reader)
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;; Parse the file name
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(let ([orig-c-file (resolve-path-spec (syntax fn) (syntax loc) (syntax orig-stx))]
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[ctx (syntax ctx)]
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[loc (syntax loc)]
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[reader (syntax reader)]
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[orig-stx (syntax orig-stx)]
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[rkt->ss (lambda (p)
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(let ([b (path->bytes p)])
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(if (regexp-match? #rx#"[.]rkt$" b)
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(path-replace-suffix p #".ss")
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p)))])
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(let ([c-file (if (file-exists? orig-c-file)
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orig-c-file
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(let ([p2 (rkt->ss orig-c-file)])
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(if (file-exists? p2)
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p2
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orig-c-file)))])
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(register-external-file c-file)
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(let ([read-syntax (if (syntax-e reader)
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(reader-val
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(let loop ([e (syntax->datum
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(local-expand reader 'expression null))])
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(cond
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[(reader? e) e]
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[(pair? e) (or (loop (car e))
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(loop (cdr e)))]
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[else #f])))
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(lambda (src in)
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(parameterize ([read-accept-reader #t])
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(read-syntax src in))))])
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(unless (and (procedure? read-syntax)
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(procedure-arity-includes? read-syntax 2))
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(raise-syntax-error
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#f
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"reader is not a procedure of two arguments"
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orig-stx))
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;; Open the included file
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(let ([p (with-handlers ([exn:fail?
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(lambda (exn)
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(raise-syntax-error
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#f
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(format
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"can't open include file (~a)"
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(if (exn? exn)
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(exn-message exn)
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exn))
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orig-stx
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c-file))])
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(open-input-file c-file))])
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(port-count-lines! p)
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;; Read expressions from file
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(let ([content
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(let loop ()
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(let ([r (with-handlers ([exn:fail?
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(lambda (exn)
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(close-input-port p)
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(raise-syntax-error
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#f
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(format
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"read error (~a)"
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(if (exn? exn)
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(exn-message exn)
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exn))
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orig-stx))])
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(read-syntax c-file p))])
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(if (eof-object? r)
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null
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(cons r (loop)))))])
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;; Here's where we'll separate the content of the file from the #lang line.
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;; 'content' is a one-member list with the file as a syntax object.
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(define content-syntax (car content)) ; save the syntax object (its context will be needed momentarily)
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;; peel the wrapper off the file. it will come in like so
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;; (module foo whatever/lang (#%module-begin expr ...))
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;; the guts are the (expr ...). To get them, we want the cdr of the fourth element.
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(define fourth cadddr) ; we don't have `fourth` in the syntax environment.
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;; get the guts and package them back into a syntax object using the saved content-syntax as context.
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(local-require racket/match)
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(define guts (match (syntax->datum content-syntax)
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[(list 'module modname lang (list '#%module-begin exprs ...)) exprs]))
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(define content-guts (datum->syntax content-syntax guts))
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(close-input-port p)
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;; Preserve src info for content, but set its
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;; lexical context to be that of the include expression
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(let ([lexed-content
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(let loop ([content content-guts]) ;; start with the new content-guts
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(cond
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[(pair? content)
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(cons (loop (car content))
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(loop (cdr content)))]
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[(null? content) null]
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[else
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(let ([v (syntax-e content)])
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(datum->syntax
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ctx
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(cond
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[(pair? v)
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(loop v)]
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[(vector? v)
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(list->vector (loop (vector->list v)))]
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[(box? v)
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(box (loop (unbox v)))]
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[else
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v])
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content
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content))]))])
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*
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(datum->syntax
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(quote-syntax here)
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`(begin ,@lexed-content)
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orig-stx)))))))]))
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(define-syntax (include-without-lang-line stx)
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(syntax-case stx ()
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[(_ fn)
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(with-syntax ([_stx stx])
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(syntax/loc stx (do-include _stx _stx _stx fn #f)))])) |