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, 2013 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:invalid-keyword
  '(keyword-argument-error . "Invalid keyword"))

(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 . ".*"))

(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-equal "unrecognized keyword" '(#:y)
    (catch 'keyword-argument-error
      (lambda ()
        (let ((f (lambda* (#:key x) x)))
          (f #:y 'not-recognized)))
      (lambda (key proc fmt args data)
        data)))

  (pass-if-equal "missing argument" '("Keyword argument has no value" #:x)
    (catch 'keyword-argument-error
      (lambda ()
        (let ((f (lambda* (#:key x) x)))
          (f #:x)))
      (lambda (key proc fmt args data)
        (cons fmt data))))

  (pass-if-equal "invalid keyword" '(not-a-keyword)
    (catch 'keyword-argument-error
      (lambda ()
        (let ((f (lambda* (#:key x) x)))
          (f 'not-a-keyword 'something)))
      (lambda (key proc fmt args data)
        data)))

  (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 "scm_c_bind_keyword_arguments"

  (pass-if-equal "unrecognized keyword" '(#:y)
    (catch 'keyword-argument-error
      (lambda ()
        (open-file "/dev/null" "r" #:y 'not-recognized))
      (lambda (key proc fmt args data)
        data)))

  (pass-if-equal "missing argument"
      '("Keyword argument has no value" #:encoding)
    (catch 'keyword-argument-error
      (lambda ()
        (open-file "/dev/null" "r" #:encoding))
      (lambda (key proc fmt args data)
        (cons fmt data))))

  (pass-if-equal "invalid keyword" '(not-a-keyword)
    (catch 'keyword-argument-error
      (lambda ()
        (open-file "/dev/null" "r" 'not-a-keyword 'something))
      (lambda (key proc fmt args data)
        data))))

(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)))

(with-test-prefix/c&e "case-lambda"
  (pass-if-exception "no clauses, no args" exception:wrong-num-args
    ((case-lambda)))

  (pass-if-exception "no clauses, args" exception:wrong-num-args
    ((case-lambda) 1))

  (pass-if "docstring"
    (equal? "docstring test"
            (procedure-documentation
             (case-lambda
              "docstring test"
              (() 0)
              ((x) 1))))))

(with-test-prefix/c&e "case-lambda*"
  (pass-if-exception "no clauses, no args" exception:wrong-num-args
    ((case-lambda*)))

  (pass-if-exception "no clauses, args" exception:wrong-num-args
    ((case-lambda*) 1))

  (pass-if "docstring"
    (equal? "docstring test"
            (procedure-documentation
             (case-lambda*
              "docstring test"
              (() 0)
              ((x) 1)))))

  (pass-if "unambiguous"
    ((case-lambda*
      ((a b) #t)
      ((a) #f))
     1 2))

  (pass-if "unambiguous (reversed)"
    ((case-lambda*
      ((a) #f)
      ((a b) #t))
     1 2))

  (pass-if "optionals (order disambiguates)"
    ((case-lambda*
      ((a #:optional b) #t)
      ((a b) #f))
     1 2))

  (pass-if "optionals (order disambiguates (2))"
    ((case-lambda*
      ((a b) #t)
      ((a #:optional b) #f))
     1 2))

  (pass-if "optionals (one arg)"
    ((case-lambda*
      ((a b) #f)
      ((a #:optional b) #t))
     1))

  (pass-if "optionals (one arg (2))"
    ((case-lambda*
      ((a #:optional b) #t)
      ((a b) #f))
     1))

  (pass-if "keywords without keyword"
    ((case-lambda*
      ((a #:key c) #t)
      ((a b) #f))
     1))

  (pass-if "keywords with keyword"
    ((case-lambda*
      ((a #:key c) #t)
      ((a b) #f))
     1 #:c 2))

  (pass-if "keywords (too many positionals)"
    ((case-lambda*
      ((a #:key c) #f)
      ((a b) #t))
     1 2))

  (pass-if "keywords (order disambiguates)"
    ((case-lambda*
      ((a #:key c) #t)
      ((a b c) #f))
     1 #:c 2))

  (pass-if "keywords (order disambiguates (2))"
    ((case-lambda*
      ((a b c) #t)
      ((a #:key c) #f))
     1 #:c 2)))