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;;;; testiere.lisp -- core testiere functionality
(in-package #:testiere)
(defstruct testiere-hook
;; a function that extracts '(:tests ...), returning them and the modified form
(extractor nil)
;; a function that accepts a form and returns a list of restart handlers
(restarts-expander nil))
(defvar *testiere-hooks*
(make-hash-table)
"Registry of macro functions and testiere-hook")
(defun register-hook (macro extractor &optional restarts-expander)
"Register a new hook for use with testiere.
MACRO is a symbol naming a macro-function
EXTRACTOR is a function of one argument, FORM representing the &WHOLE
of the macro-function call. It returns two values: a modified s form
identical with FORM except (:tests ...) forms have been
removed. The second value should be the conatenation of the CDRs of
these (:tests ...) forms.
RESTARTS-EXPANDER is an optional functionof one argument. It returns
the restart handler clauses of a RESTART-CASE form. These are the
restarts to try when tests fail."
(setf (gethash (macro-function macro) *testiere-hooks*)
(make-testiere-hook
:extractor extractor
:restarts-expander restarts-expander)))
(defvar *cached-macroexpand-hook* nil)
(defun testiere-hook (expander form environment)
(let* ((hook
(gethash expander *testiere-hooks*)))
(cond
(hook
(with-slots (extractor restarts-expander) hook
(multiple-value-bind (form test-forms) (funcall extractor form)
(if test-forms
(let ((tests (expand-test-forms test-forms)))
(if restarts-expander
`(prog1 ,(funcall expander form environment)
(restart-case (progn ,@tests)
,@(funcall restarts-expander form)))
`(prog1 ,(funcall expander form environment)
,@tests)))
(funcall expander form environment)))))
(t
(funcall expander form environment)))))
(defun expand-test-forms (forms)
(mapcar #'expand-test-form forms))
(defun expand-test-form (form)
(ematch form
((list :fails failing-form)
`(assert (handler-case (progn ,failing-form nil)
(error () t))
()
"~s should have signalled an error but did not."
',failing-form))
((list :signals condition signalling-form)
`(assert (handler-case (progn ,signalling-form)
(,condition () t)
(condition () nil))
()
"~s should have signalled ~s but did not."
',signalling-form
',condition))
((list* :funcall function args)
`(funcall ,function ,@args))
((list* :with-defuns (list* stubs) body)
(expand-defun-stubs stubs body))
((list* :with-generic name (list* method-stubs) body)
(expand-generic-stub name method-stubs body))
((list* :let (list* bindings) body)
`(let ,bindings ,@(expand-test-forms body)))
((list :do form)
form)
((list :is form)
`(assert ,form () "~s failed" ',form))
((list comparator a b)
(let ((a-result (gensym))
(b-result (gensym))
(pred-result (gensym)))
`(let* ((,a-result ,a)
(,b-result ,b)
(,pred-result (,comparator ,a-result ,b-result)))
(assert ,pred-result () "~s failed with ~s"
',form
(list ',comparator ,a-result ,b-result)))))))
(defun expand-defun-stubs (defs body)
(let* ((redef-names
(mapcar #'car defs))
(defun-cache
(loop :for name :in redef-names
:collect `(cons ',name
(and (fboundp ',name)
(fdefinition ',name)))))
(defun-cache-var
(gensym "DEFUN-CACHE"))
(defun-redefs
(loop :for (name lambda-list . fbod) :in defs
:collect `(setf (fdefinition ',name)
(lambda ,lambda-list ,@fbod))))
(defun-restore
(loop :for name :in redef-names
:collect `(if (cdr (assoc ',name ,defun-cache-var))
(setf (fdefinition ',name)
(cdr (assoc ',name ,defun-cache-var)))
(fmakunbound ',name)))))
`(let ((,defun-cache-var (list ,@defun-cache)))
(unwind-protect
(progn ,@defun-redefs
,@(expand-test-forms body))
,@defun-restore))))
(defun expand-generic-stub (name method-stubs body)
(let* ((orig-generic
(gensym "DEFGENERIC-CACHE"))
(method-defs
(loop :for stub :in method-stubs
:collect `(defmethod ,name ,@stub))))
`(let ((,orig-generic (and (fboundp ',name) (fdefinition ',name))))
(unwind-protect
(progn
,@method-defs
,@(expand-test-forms body))
(when ,orig-generic
(setf (fdefinition ',name) ',orig-generic))))))
(defun standard-extractor (orig-form)
"A somewhat naive default test form extractor. Returns two values,
orig-form without test forms included, and a collection of test forms."
(loop
:for form :in orig-form
:when (and (listp form)
(eq :tests (first form)))
:append (cdr form) :into tests-forms
:else
:collect form :into defun-form
:finally (return (values defun-form tests-forms))))
(defun on ()
(unless (member :testiere *features*)
(pushnew :testiere *features*)
(setf
*cached-macroexpand-hook* *macroexpand-hook*
*macroexpand-hook* 'testiere-hook )))
(defun off ()
(when (member :testiere *features*)
(setf *features* (delete :testiere *features*))
(setf *macroexpand-hook* *cached-macroexpand-hook*
*cached-macroexpand-hook* nil)))
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