guile/test-suite/tests/optargs.test

;;;; optargs.test --- test suite for optional arg processing -*- scheme -*-
;;;; Matthias Koeppe <mkoeppe@mail.math.uni-magdeburg.de> --- June 2001
;;;;
;;;; 	Copyright (C) 2001, 2006, 2009, 2010 Free Software Foundation, Inc.
;;;; 
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;; 
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;; 
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

(define-module (test-suite test-optargs)
  #:use-module (test-suite lib)
  #:use-module (system base compile)
  #:use-module (ice-9 optargs))

(define exception:unrecognized-keyword
  '(keyword-argument-error . "Unrecognized keyword"))

(define exception:extraneous-arguments
  ;; Message depends on whether we use the interpreter or VM, and on the
  ;; evenness of the number of extra arguments (!).
  ;'(keyword-argument-error . ".*")
  '(#t . ".*"))

(define-syntax c&e
  (syntax-rules (pass-if pass-if-exception)
    ((_ (pass-if test-name exp))
     (begin (pass-if (string-append test-name " (eval)")
                     (primitive-eval 'exp))
            (pass-if (string-append test-name " (compile)")
                     (compile 'exp #:to 'value #:env (current-module)))))
    ((_ (pass-if-exception test-name exc exp))
     (begin (pass-if-exception (string-append test-name " (eval)")
                               exc (primitive-eval 'exp))
            (pass-if-exception (string-append test-name " (compile)")
                               exc (compile 'exp #:to 'value
                                            #:env (current-module)))))))

(define-syntax with-test-prefix/c&e
  (syntax-rules ()
    ((_ section-name exp ...)
     (with-test-prefix section-name (c&e exp) ...))))

(with-test-prefix/c&e "optional argument processing"
  (pass-if "local defines work with optional arguments"
    (eval '(begin
             (define* (test-1 #:optional (x 0))
               (define d 1)			; local define
               #t)
             (false-if-exception (test-1)))
          (interaction-environment))))

;;;
;;; let-keywords
;;;

(with-test-prefix/c&e "let-keywords"

  ;; in guile 1.6.4 and earlier, an empty binding list only used `begin',
  ;; which caused apparently internal defines to "leak" out into the
  ;; encompasing environment
  (pass-if-exception "empty bindings internal defines leaking out"
      exception:unbound-var
    (let ((rest '()))
      (let-keywords rest #f ()
	(define localvar #f)
	#f)
      localvar))

  (pass-if "one key"
    (let-keywords '(#:foo 123) #f (foo)
      (= foo 123))))

;;;
;;; let-keywords*
;;;

(with-test-prefix/c&e "let-keywords*"

  ;; in guile 1.6.4 and earlier, an empty binding list only used `begin',
  ;; which caused apparently internal defines to "leak" out into the
  ;; encompasing environment
  (pass-if-exception "empty bindings internal defines leaking out"
      exception:unbound-var
    (let ((rest '()))
      (let-keywords* rest #f ()
	(define localvar #f)
	#f)
      localvar))

  (pass-if "one key"
    (let-keywords* '(#:foo 123) #f (foo)
      (= foo 123))))

;;;
;;; let-optional
;;;

(with-test-prefix/c&e "let-optional"

  ;; in guile 1.6.4 and earlier, an empty binding list only used `begin',
  ;; which caused apparently internal defines to "leak" out into the
  ;; encompasing environment
  (pass-if-exception "empty bindings internal defines leaking out"
      exception:unbound-var
    (let ((rest '()))
      (let-optional rest ()
	(define localvar #f)
	#f)
      localvar))

  (pass-if "one var"
    (let ((rest '(123)))
      (let-optional rest ((foo 999))
	(= foo 123)))))

;;;
;;; let-optional*
;;;

(with-test-prefix/c&e "let-optional*"

  ;; in guile 1.6.4 and earlier, an empty binding list only used `begin',
  ;; which caused apparently internal defines to "leak" out into the
  ;; encompasing environment
  (pass-if-exception "empty bindings internal defines leaking out"
      exception:unbound-var
    (let ((rest '()))
      (let-optional* rest ()
	(define localvar #f)
	#f)
      localvar))

  (pass-if "one var"
    (let ((rest '(123)))
      (let-optional* rest ((foo 999))
	(= foo 123)))))

(define* (foo a b #:optional c (d 1) (e c) f #:key g (h a) (i r) #:rest r)
  (list a b c d e f g h i r))

;; So we could use lots more tests here, but the fact that lambda* is in
;; the compiler, and the compiler compiles itself, using the evaluator
;; (when bootstrapping) and compiled code (when doing a partial rebuild)
;; makes me a bit complacent.
(with-test-prefix/c&e "define*"
  (pass-if "the whole enchilada"
    (equal? (foo 1 2)
            '(1 2 #f 1 #f #f #f 1 () ())))

  (pass-if-exception "extraneous arguments"
    exception:extraneous-arguments
    (let ((f (lambda* (#:key x) x)))
      (f 1 2 #:x 'x)))

  (pass-if-exception "unrecognized keyword"
    exception:unrecognized-keyword
    (let ((f (lambda* (#:key x) x)))
      (f #:y 'not-recognized)))

  (pass-if "rest given before keywords"
    ;; Passing the rest argument before the keyword arguments should not
    ;; prevent keyword argument binding.
    (let ((f (lambda* (#:key x y z #:rest r) (list x y z r))))
      (equal? (f 1 2 3 #:x 'x #:z 'z)
              '(x #f z (1 2 3 #:x x #:z z))))))

(with-test-prefix/c&e "lambda* inits"
  (pass-if "can bind lexicals within inits"
    (begin
      (define qux
        (lambda* (#:optional a #:key (b (or a 13) #:a))
          b))
      #t))
  (pass-if "testing qux"
    (and (equal? (qux) 13)
         (equal? (qux 1) 1)
         (equal? (qux #:a 2) 2)))
  (pass-if "nested lambda* with optional"
    (begin
      (define (foo x)
        (define baz x)
        (define* (bar #:optional (y baz))
          (or (zero? y) (bar (1- y))))
        (bar))
      (foo 10)))
  (pass-if "nested lambda* with key"
    (begin
      (define (foo x)
        (define baz x)
        (define* (bar #:key (y baz))
          (or (zero? y) (bar #:y (1- y))))
        (bar))
      (foo 10))))


(with-test-prefix/c&e "defmacro*"
  (pass-if "definition"
    (begin
      (defmacro* transmogrify (a #:optional (b 10))
        `(,a ,b))
      #t))
  
  (pass-if "explicit arg"
    (equal? (transmogrify quote 5)
            5))

  (pass-if "default arg"
    (equal? (transmogrify quote)
            10)))