90 lines
3.7 KiB
Common Lisp
90 lines
3.7 KiB
Common Lisp
(in-package #:syrup)
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;; Support for inline and in-file symbol exports.
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(defvar *capture-exports* nil
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"If non-nil, #^ won't export symbols, and will instead add to *exports*. Either T, NIL, or a specific package to monitor.")
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(defvar *exports* nil
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"List of captured symbol exports.")
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(defvar *package-files-table* (make-hash-table :weakness :key :synchronized t)
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"Hashtable of per-package file lists which exported symbols via Syrup macros.")
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(defun mark-package-file ()
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(pushnew (or *compile-file-truename* *load-truename*)
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(gethash *package* *package-files-table*)))
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;; #^ - Inline symbol export macro
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;; Use #^SYMBOL or #^(SYMBOL) to export a symbol at the location it's defined.
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(defun read-exported-symbol (stream char arg)
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"Read a symbol (optionally wrapped in parens) and export it"
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(declare (ignore char arg))
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(let ((sym (read stream t nil t)))
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(when (and (consp sym) (not (cdr sym)))
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(setf sym (car sym))) ;; allow wrapping symbol in parens
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(unless (symbolp sym)
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(error 'simple-reader-error
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:stream stream
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:format-control "Not a symbol: ~S"
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:format-arguments (list sym)))
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(if *capture-exports*
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(when (or (eq t *capture-exports*) (eq *package* *capture-exports*))
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(push sym *exports*))
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(progn (mark-package-file)
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(export sym)))
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sym))
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(set-dispatch-macro-character #\# #\^ #'read-exported-symbol)
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(defun ensure-symbol (sym)
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(etypecase sym
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(symbol
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(if (and (symbol-package sym) (not (keywordp sym)))
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sym
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(intern (symbol-name sym))))
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(string
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(intern sym))))
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(defmacro export* (&rest symbols)
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(mark-package-file)
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`(export ',(mapcar #'ensure-symbol symbols)))
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(defun read-stream-for-exports (stream &optional target-package)
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"Read Lisp source code from STREAM to determine the list of symbols it exports."
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(when target-package
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(let ((pkg (find-package target-package)))
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(unless pkg (error "No such package: ~S" target-package))
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(setf target-package pkg)))
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(let ((*package* *package*)
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(*readtable* *readtable*)
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(*capture-exports* (or target-package t))
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(*exports* nil)
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(eof-sentinel (make-symbol "eof-sentinel")))
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(loop for form = (read stream nil eof-sentinel)
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until (eq form eof-sentinel)
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do (when (consp form)
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(case (car form)
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(in-package
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(let ((pkg (find-package (cadr form))))
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(unless pkg (error "No such package: ~S" (cadr form)))
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(setf *package* pkg)
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(when (eq t *capture-exports*)
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(setf *capture-exports* pkg))))
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(export*
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(when (eq *package* *capture-exports*)
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(setf *exports* (nconc (mapcar #'ensure-symbol (cdr form)) *exports*)))))))
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*exports*))
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(defmacro defpackage* (package-name &rest options)
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"Wrapper around uiop:define-package that tries to be aware of symbols exported in other files."
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(let ((extra-exports nil)
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(pkg (find-package package-name)))
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(when pkg
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;; We're redefining the package, so let's scan the files we know about for exported symbols.
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;; This prevents them from being un-exported if the files are re-loaded out of order.
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(dolist (pathname (gethash pkg *package-files-table*))
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(let ((exports (with-open-file (stream pathname :if-does-not-exist nil)
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(read-stream-for-exports stream pkg))))
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(format *error-output* "Exports from ~S:~% ~S~%" pathname exports)
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(setf extra-exports (nconc exports extra-exports)))))
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`(uiop:define-package ,package-name
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(:export ,@(cdr (assoc :export options)) ,@extra-exports)
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,@(remove :export options :key #'car))))
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