;;;; regexp.test --- test Guile's regular expression functions -*- scheme -*-
;;;; Jim Blandy <jimb@red-bean.com> --- September 1999
;;;;
;;;; 	Copyright (C) 1999 Free Software Foundation, Inc.
;;;; 
;;;; This program 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, or (at your option)
;;;; any later version.
;;;; 
;;;; This program 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 this software; see the file COPYING.  If not, write to
;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
;;;; Boston, MA 02111-1307 USA

(use-modules (test-suite lib)
	     (ice-9 regex))

;;; Run a regexp-substitute or regexp-substitute/global test, once
;;; providing a real port and once providing #f, requesting direct
;;; string output.
(define (vary-port func expected . args)
  (pass-if "port is string port"
	   (equal? expected
		   (call-with-output-string
		    (lambda (port)
		      (apply func port args)))))
  (pass-if "port is #f"
	   (equal? expected
		   (apply func #f args))))

(define (object->string obj)
  (call-with-output-string
   (lambda (port)
     (write obj port))))

(with-test-prefix "regexp-substitute"
  (let ((match
	 (string-match "patleft(sub1)patmid(sub2)patright"
		       "contleftpatleftsub1patmidsub2patrightcontright")))
    (define (try expected . args)
      (with-test-prefix (object->string args)
	(apply vary-port regexp-substitute expected match args)))

    (try "")
    (try "string1" "string1")
    (try "string1string2" "string1" "string2")
    (try "patleftsub1patmidsub2patright" 0)
    (try "hi-patleftsub1patmidsub2patright-bye" "hi-" 0 "-bye")
    (try "sub1" 1)
    (try "hi-sub1-bye" "hi-" 1 "-bye")
    (try "hi-sub2-bye" "hi-" 2 "-bye")
    (try "contleft" 'pre)
    (try "contright" 'post)
    (try "contrightcontleft" 'post 'pre)
    (try "contrightcontleftcontrightcontleft" 'post 'pre 'post 'pre)
    (try "contrightsub2sub1contleft" 'post 2 1 'pre)
    (try "foosub1sub1sub1sub1bar" "foo" 1 1 1 1 "bar")))

(with-test-prefix "regexp-substitute/global"
  
  (define (try expected . args)
    (with-test-prefix (object->string args)
      (apply vary-port regexp-substitute/global expected args)))

  (try "hi" "a(x*)b" "ab" "hi")
  (try ""   "a(x*)b" "ab" 1)
  (try "xx" "a(x*)b" "axxb" 1)
  (try "xx" "a(x*)b" "_axxb_" 1)
  (try "pre" "a(x*)b" "preaxxbpost" 'pre)
  (try "post" "a(x*)b" "preaxxbpost" 'post)
  (try "string" "x" "string" 'pre "y" 'post)
  (try "4" "a(x*)b" "_axxb_" (lambda (m)
				(number->string (match:end m 1))))

  (try "_aybycyd_" "x+" "_axbxxcxxxd_" 'pre "y" 'post)

  ;; This should not go into an infinite loop, just because the regexp
  ;; can match the empty string.  This test also kind of beats on our
  ;; definition of where a null string can match.
  (try "y_yaybycydy_y" "x*" "_axbxxcxxxd_" 'pre "y" 'post)

  ;; These kind of bother me.  The extension from regexp-substitute to
  ;; regexp-substitute/global is only natural if your item list
  ;; includes both pre and post.  If those are required, why bother
  ;; to include them at all?
  (try "4:7:12:_" "a(x*)b" "_axxbaxbaxxxb_"
       (lambda (m) (number->string (match:end m 1))) ":"
       'post)
  (try "4:10:19:_:19:10:4" "a(x*)b" "_axxbaxxxxbaxxxxxxxb_"
       (lambda (m) (number->string (match:end m 1))) ":"
       'post
       ":" (lambda (m) (number->string (match:end m 1))))

  ;; Jan Nieuwenhuizen's bug, 2 Sep 1999
  (try "" "_" (make-string 500 #\_)
       'post))