guile/test-suite/tests/format.test

;;;; format.test --- test suite for Guile's CL-ish format  -*- scheme -*-
;;;; Matthias Koeppe <mkoeppe@mail.math.uni-magdeburg.de> --- June 2001
;;;;
;;;; Copyright (C) 2001, 2003, 2004, 2006, 2010, 2011, 2012,
;;;;   2014, 2017 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-format)
  #:use-module (test-suite lib)
  #:use-module (ice-9 i18n)
  #:use-module (ice-9 format))


(with-test-prefix "simple-format"
  (pass-if-exception "current-output-port is closed"
      exception:wrong-type-arg
    ;; This used to segfault in Guile <= 2.0.10.
    (let ((old (current-output-port))
          (new (%make-void-port "w")))
      (dynamic-wind
        (lambda ()
          (set-current-output-port new)
          (close-port new))
        (lambda ()
          (simple-format #t "hello, closed port!")
          #t)
        (lambda ()
          (set-current-output-port old))))))

;;; FORMAT Basic Output

(with-test-prefix "format basic output"
  (pass-if "default to Unicode-capable port"
    ;; `(format #f ...)' should be able to deal with Unicode characters.
    (with-fluids ((%default-port-encoding "ISO-8859-1"))
      (let ((alpha (integer->char #x03b1)))  ; GREEK SMALL LETTER ALPHA
        (= 1 (string-length (format #f (string alpha)))))))

  (pass-if "format ~% produces a new line"
	   (string=? (format #f "~%") "\n"))
  (pass-if "format ~& starts a fresh line"
	   (string=? (format #f "~&abc~&~&") "abc\n"))
  (pass-if "format ~& is stateless but works properly across outputs via port-column"
	   (string=?
	    (with-output-to-string
	      (lambda ()
		(display "xyz")
		(format #t "~&abc")
		(format #f "~&")	; shall have no effect
		(format #t "~&~&")))
	    "xyz\nabc\n"))
  (pass-if "format ~F (format-out-substr) maintains the column correctly"
	   (= (string-length (format #f "~@F~20T" 1)) 20)))

;;;
;;; misc
;;;

(with-test-prefix "format"

  ;; in guile 1.6.4 and earlier, excess arguments were an error, but this
  ;; changed to follow the common lisp spec
  (pass-if "excess arguments ignored A"
    (string=? (format #f "" 1 2 3 4) ""))
  (pass-if "excess arguments ignored B"
    (string=? (format #f "~a ~a" 1 2 3 4) "1 2")))

;;;
;;; ~d
;;;

(with-test-prefix "~d decimal integer"

  (with-test-prefix "~@d"

    (pass-if "-1"
      (string=? (format #f "~@d" -1) "-1"))

    ;; in guile 1.6.4 and earlier, ~@d gave "0" but we think "+0" is what the
    ;; common lisp spec intendes
    (pass-if "+0"
      (string=? (format #f "~@d" 0) "+0"))

    (pass-if "+1"
      (string=? (format #f "~@d" 1) "+1"))))

;;;
;;; ~f
;;;

(with-test-prefix "~f fixed-point"

  (pass-if "1.5"
    (string=? "1.5" (format #f "~f" 1.5)))
  
  (pass-if "3/2"
    (string=? "1.5" (format #f "~f" 3/2)))

  (pass-if "~2f"
    (string=? "10." (format #f "~2f" 9.9)))

  (pass-if "~2,1f"
    (string=? "9.9" (format #f "~2,1f" 9.9)))

  (pass-if "~2,2f"
    (string=? "9.90" (format #f "~2,2f" 9.9)))
  
  ;; in guile prior to 1.6.9 and 1.8.1, leading zeros were incorrectly
  ;; stripped, moving the decimal point and giving "25.0" here
  (pass-if "string 02.5"
    (string=? "2.5" (format #f "~f" "02.5"))))

;;;
;;; ~h
;;;

(when (defined? 'setlocale)
  (setlocale LC_ALL "C"))

(with-test-prefix "~h localized number"

  (pass-if "1234.5"
    (string=? (format #f "~h" 1234.5) "1234.5"))

  (pass-if "padding"
    (string=? (format #f "~6h" 123.2) " 123.2"))

  (pass-if "padchar"
    (string=? (format #f "~8,,'*h" 123.2) "***123.2"))

  (pass-if "decimals"
    (string=? (format #f "~,2h" 123.4567)
              "123.46"))

  (pass-if "locale"
    (string=? (format #f "~,3:h, ~a" 1234.5678
                      %global-locale "approximately")
              "1234.568, approximately")))

;;;
;;; ~{
;;;

(with-test-prefix "~{ iteration"

  ;; In Guile 1.6.4 and earlier, the maximum iterations parameter defaulted
  ;; to 100, but it's now like Common Lisp where the default is no limit
  (pass-if "no arbitrary iteration limit"
    (= (string-length (format #f "~{~a~}" (make-list 200 #\b))) 200)))