src/final.lisp (test-parse-c-type): Abstract out the tedious setup stage.

[sod] / src / final.lisp

;;; -*-lisp-*-
;;;
;;; Finishing touches for Sod
;;;
;;; (c) 2015 Straylight/Edgeware
;;;

;;;----- Licensing notice ---------------------------------------------------
;;;
;;; This file is part of the Sensible Object Design, an object system for C.
;;;
;;; SOD is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 2 of the License, or
;;; (at your option) any later version.
;;;
;;; SOD is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with SOD; if not, write to the Free Software Foundation,
;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

(cl:in-package #:sod)

;;;--------------------------------------------------------------------------
;;; Miscellaneous details.

(export '*sod-version*)
(defparameter *sod-version* sod-sysdef:*version*
  "The version of the SOD translator system, as a string.")

;;;--------------------------------------------------------------------------
;;; Debugging utilities.

(export '*debugout-pathname*)
(defvar *debugout-pathname* #p"debugout.c")

(export 'test-module)
(defun test-module (path &key reason clear backtrace)
  "Read a module from PATH, to exercise the machinery.

   If CLEAR is non-nil, then reset the translator's state before proceeding.

   If REASON is non-nil, then output the module to `*debugout-pathname*' with
   that REASON.

   Return a two-element list (NERROR NWARNING) of the number of errors and
   warnings encountered while processing the module."
  (when clear (clear-the-decks))
  (multiple-value-bind (module nerror nwarning)
      (if backtrace (read-module path)
	  (count-and-report-errors () (read-module path)))
    (when (and module reason)
      (with-open-file (out *debugout-pathname*
		       :direction :output
		       :if-exists :supersede
		       :if-does-not-exist :create)
	(output-module module reason out)))
    (list nerror nwarning)))

(defmacro with-test-scanner ((scanner string) &body body)
  "Common machinery for `test-parse-MUMBLE' below.

   This is too specialized to make more widely available."
  (with-gensyms (in charscan)
    (once-only (string)
      `(with-input-from-string (,in ,string)
	 (let* ((*module-type-map* (make-hash-table))
		(,charscan (make-instance 'charbuf-scanner
					  :stream ,in
					  :filename "<string>"))
		(,scanner (make-instance 'sod-token-scanner
					 :char-scanner ,charscan
					 :filename "<string>")))
	   (with-parser-context (token-scanner-context :scanner ,scanner)
	     ,@body))))))

(export 'test-parse-c-type)
(defun test-parse-c-type (string)
  "Parse STRING as a C type, with optional kernel, and show the results."
  (with-test-scanner (scanner string)
    (multiple-value-bind (value winp consumedp)
	(parse (seq ((decls (parse-c-type scanner))
		     (type (parse-declarator scanner decls :abstractp t))
		     :eof)
		    type))
      (declare (ignore consumedp))
      (if winp
	  (values t (car value) (cdr value)
		  (princ-to-string (car value)))
	  (values nil value)))))

(export 'test-parser)
(defmacro test-parser ((scanner &key backtrace) parser input)
  "Convenient macro for testing parsers at the REPL.

   This is a macro so that the parser can use the fancy syntax.  The name
   SCANNER is bound to a `sod-token-scanner' reading tokens from the INPUT
   string.  Then the PARSER is invoked and three values are returned: the
   result of the parse, or `nil' if the main parse failed; a list containing
   the number of errors and warnings (respectively) reported during the
   parse; and a list consisting of the lookahead token type and value, and a
   string containing the untokenized remaining input.

   If BACKTRACE is nil (the default) then leave errors to the calling
   environment to sort out (e.g., by entering the Lisp debugger); otherwise,
   catch and report them as they happen so that you can test error recovery
   strategies."
  (once-only (input)
    (with-gensyms (char-scanner value winp body consumedp where nerror nwarn)
      `(let ((,char-scanner nil) (,scanner nil))
	 (with-parser-context (token-scanner-context :scanner ,scanner)
	   (multiple-value-bind (,value ,nerror ,nwarn)
	       (flet ((,body ()
			(setf ,char-scanner (make-string-scanner ,input)
			      ,scanner (make-instance
					'sod-token-scanner
					:char-scanner ,char-scanner))
			(with-default-error-location (,scanner)
			  (multiple-value-bind (,value ,winp ,consumedp)
			      (parse ,parser)
			    (declare (ignore ,consumedp))
			    (cond (,winp ,value)
				  (t (syntax-error ,scanner ,value)
				     nil))))))
		 (if ,backtrace (,body)
		     (count-and-report-errors ()
		       (,body))))
	     (let ((,where (scanner-capture-place ,char-scanner)))
	       (values ,value
		       (list ,nerror ,nwarn)
		       (and ,scanner (list (token-type ,scanner)
					   (token-value ,scanner)
					   (subseq ,input ,where)))))))))))

;;;--------------------------------------------------------------------------
;;; Calisthenics.

(export 'exercise)
(defun exercise ()
  "Exercise the pieces of the metaobject protocol.

   In some Lisps, the compiler is run the first time methods are called, to
   do fancy just-in-time optimization things.  This is great, only the
   program doesn't actually run for very long and a lot of that work is
   wasted because we're going to have to do it again next time the program
   starts.  Only, if we exercise the various methods, or at least a large
   fraction of them, before we dump an image, then everything will be fast.

   That's the theory anyway.  Call this function before you dump an image and
   see what happens."

  (dolist (reason '(:h :c))
    (with-output-to-string (bitbucket)
      (output-module *builtin-module* reason bitbucket)))

  (clear-the-decks))

;;;--------------------------------------------------------------------------
;;; Make sure things work after loading the system.

(clear-the-decks)

;;;----- That's all, folks --------------------------------------------------