guix/tests/records.scm

;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2018 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (test-records)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-64)
  #:use-module (ice-9 match)
  #:use-module (ice-9 regex)
  #:use-module (guix records))

(define (test-module)
  ;; A module in which to evaluate things that are known to fail.
  (let ((module (make-fresh-user-module)))
    (module-use! module (resolve-interface '(guix records)))
    module))


(test-begin "records")

(test-assert "define-record-type*"
  (begin
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar)
      (baz foo-baz (default (+ 40 2))))
    (and (match (foo (bar 1) (baz 2))
           (($ <foo> 1 2) #t))
         (match (foo (baz 2) (bar 1))
           (($ <foo> 1 2) #t))
         (match (foo (bar 1))
           (($ <foo> 1 42) #t)))))

(test-assert "define-record-type* with let* behavior"
  ;; Make sure field initializers can refer to each other as if they were in
  ;; a 'let*'.
  (begin
    (define-record-type* <bar> bar make-bar
      foo?
      (x bar-x)
      (y bar-y (default (+ 40 2)))
      (z bar-z))
    (and (match (bar (x 1) (y (+ x 1)) (z (* y 2)))
           (($ <bar> 1 2 4) #t))
         (match (bar (x 7) (z (* x 3)))
           (($ <bar> 7 42 21) #t))
         (match (bar (z 21) (x (/ z 3)))
           (($ <bar> 7 42 21) #t)))))

(test-assert "define-record-type* & inherit"
  (begin
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar)
      (baz foo-baz (default (+ 40 2))))
    (let* ((a (foo (bar 1)))
           (b (foo (inherit a) (baz 2)))
           (c (foo (inherit b) (bar -2)))
           (d (foo (inherit c)))
           (e (foo (inherit (foo (bar 42))) (baz 77))))
     (and (match a (($ <foo> 1 42) #t))
          (match b (($ <foo> 1 2) #t))
          (match c (($ <foo> -2 2) #t))
          (equal? c d)
          (match e (($ <foo> 42 77) #t))))))

(test-assert "define-record-type* & inherit & let* behavior"
  (begin
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar)
      (baz foo-baz (default (+ 40 2))))
    (let* ((a (foo (bar 77)))
           (b (foo (inherit a) (bar 1) (baz (+ bar 1))))
           (c (foo (inherit b) (baz 2) (bar (- baz 1)))))
     (and (match a (($ <foo> 77 42) #t))
          (match b (($ <foo> 1 2) #t))
          (equal? b c)))))

(test-assert "define-record-type* & inherit & innate"
  (begin
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar (innate) (default 42)))
    (let* ((a (foo (bar 1)))
           (b (foo (inherit a)))
           (c (foo (inherit a) (bar 3)))
           (d (foo)))
      (and (match a (($ <foo> 1) #t))
           (match b (($ <foo> 42) #t))
           (match c (($ <foo> 3) #t))
           (match d (($ <foo> 42) #t))))))

(test-assert "define-record-type* & thunked"
  (begin
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar)
      (baz foo-baz (thunked)))

    (let* ((calls 0)
           (x     (foo (bar 2)
                       (baz (begin (set! calls (1+ calls)) 3)))))
      (and (zero? calls)
           (equal? (foo-bar x) 2)
           (equal? (foo-baz x) 3) (= 1 calls)
           (equal? (foo-baz x) 3) (= 2 calls)))))

(test-assert "define-record-type* & thunked & default"
  (begin
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar)
      (baz foo-baz (thunked) (default 42)))

    (let ((mark (make-parameter #f)))
      (let ((x (foo (bar 2) (baz (mark))))
            (y (foo (bar 2))))
        (and (equal? (foo-bar x) 2)
             (parameterize ((mark (cons 'a 'b)))
               (eq? (foo-baz x) (mark)))
             (equal? (foo-bar y) 2)
             (equal? (foo-baz y) 42))))))

(test-assert "define-record-type* & thunked & inherited"
  (begin
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar (thunked))
      (baz foo-baz (thunked) (default 42)))

    (let ((mark (make-parameter #f)))
      (let* ((x (foo (bar 2) (baz (mark))))
             (y (foo (inherit x) (bar (mark)))))
        (and (equal? (foo-bar x) 2)
             (parameterize ((mark (cons 'a 'b)))
               (eq? (foo-baz x) (mark)))
             (parameterize ((mark (cons 'a 'b)))
               (eq? (foo-bar y) (mark)))
             (parameterize ((mark (cons 'a 'b)))
               (eq? (foo-baz y) (mark))))))))

(test-assert "define-record-type* & thunked & innate"
  (let ((mark (make-parameter #f)))
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar (thunked) (innate) (default (mark)))
      (baz foo-baz (default #f)))

    (let* ((x (foo (bar 42)))
           (y (foo (inherit x) (baz 'unused))))
      (and (procedure? (struct-ref x 0))
           (equal? (foo-bar x) 42)
           (parameterize ((mark (cons 'a 'b)))
             (eq? (foo-bar y) (mark)))
           (parameterize ((mark (cons 'a 'b)))
             (eq? (foo-bar y) (mark)))))))

(test-assert "define-record-type* & delayed"
  (begin
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar (delayed)))

    (let* ((calls 0)
           (x     (foo (bar (begin (set! calls (1+ calls)) 3)))))
      (and (zero? calls)
           (equal? (foo-bar x) 3) (= 1 calls)
           (equal? (foo-bar x) 3) (= 1 calls)
           (equal? (foo-bar x) 3) (= 1 calls)))))

(test-assert "define-record-type* & delayed & default"
  (let ((mark #f))
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar (delayed) (default mark)))

    (let ((x (foo)))
      (set! mark 42)
      (and (equal? (foo-bar x) 42)
           (begin
             (set! mark 7)
             (equal? (foo-bar x) 42))))))

(test-assert "define-record-type* & delayed & inherited"
  (begin
    (define-record-type* <foo> foo make-foo
      foo?
      (bar foo-bar (delayed))
      (baz foo-baz (delayed)))

    (let* ((m 1)
           (n #f)
           (x (foo (bar m) (baz n)))
           (y (foo (inherit x) (baz 'b))))
      (set! n 'a)
      (and (equal? (foo-bar x) 1)
           (eq? (foo-baz x) 'a)
           (begin
             (set! m 777)
             (equal? (foo-bar y) 1))              ;promise was already forced
           (eq? (foo-baz y) 'b)))))

(test-assert "define-record-type* & wrong field specifier"
  (let ((exp '(begin
                (define-record-type* <foo> foo make-foo
                  foo?
                  (bar foo-bar (default 42))
                  (baz foo-baz))

                (foo (baz 1 2 3 4 5))))           ;syntax error
        (loc         (current-source-location)))  ;keep this alignment!
    (catch 'syntax-error
      (lambda ()
        (eval exp (test-module))
        #f)
      (lambda (key proc message location form . args)
        (and (eq? proc 'foo)
             (string-match "invalid field" message)
             (equal? form '(baz 1 2 3 4 5))

             ;; Make sure the location is that of the field specifier.
             ;; See <http://bugs.gnu.org/23969>.
             (lset= equal?
                    (pk 'expected-loc
                        `((line . ,(- (assq-ref loc 'line) 1))
                          ,@(alist-delete 'line loc)))
                    (pk 'actual-loc location)))))))

(test-assert "define-record-type* & missing initializers"
  (catch 'syntax-error
    (lambda ()
      (eval '(begin
               (define-record-type* <foo> foo make-foo
                 foo?
                 (bar foo-bar (default 42))
                 (baz foo-baz))

               (foo))
            (test-module))
      #f)
    (lambda (key proc message location form . args)
      (and (eq? proc 'foo)
           (string-match "missing .*initialize.*baz" message)
           (equal? form '(foo))))))

(test-assert "define-record-type* & extra initializers"
  (catch 'syntax-error
    (lambda ()
      (eval '(begin
               (define-record-type* <foo> foo make-foo
                 foo?
                 (bar foo-bar (default 42)))

               (foo (baz 'what?)))
            (test-module))
      #f)
    (lambda (key proc message location form . args)
      (and (string-match "extra.*initializer.*baz" message)
           (eq? proc 'foo)))))

(test-assert "define-record-type* & inherit & extra initializers"
  (catch 'syntax-error
    (lambda ()
      (eval '(begin
               (define-record-type* <foo> foo make-foo
                 foo?
                 (bar foo-bar (default 42)))

               (foo (inherit (foo)) (baz 'what?)))
            (test-module))
      #f)
    (lambda (key proc message location form . args)
      (and (string-match "extra.*initializer.*baz" message)
           (eq? proc 'foo)))))

(test-assert "ABI checks"
  (let ((module (test-module)))
    (eval '(begin
             (define-record-type* <foo> foo make-foo
               foo?
               (bar foo-bar (default 42)))

             (define (make-me-a-record) (foo)))
          module)
    (unless (eval '(foo? (make-me-a-record)) module)
      (error "what?" (eval '(make-me-a-record) module)))

    ;; Redefine <foo> with an additional field.
    (eval '(define-record-type* <foo> foo make-foo
             foo?
             (baz foo-baz)
             (bar foo-bar (default 42)))
          module)

    ;; Now 'make-me-a-record' is out of sync because it does an
    ;; 'allocate-struct' that corresponds to the previous definition of <foo>.
    (catch 'record-abi-mismatch-error
      (lambda ()
        (eval '(foo? (make-me-a-record)) module)
        #f)
      (lambda (key rtd . _)
        (eq? rtd (eval '<foo> module))))))

(test-equal "recutils->alist"
  '((("Name" . "foo")
     ("Version" . "0.1")
     ("Synopsis" . "foo bar")
     ("Something_else" . "chbouib"))
    (("Name" . "bar")
     ("Version" . "1.5")))
  (let ((p (open-input-string "
# Comment following an empty line, and
# preceding a couple of empty lines, all of
# which should be silently consumed.


Name: foo
Version: 0.1
# Comment right in the middle,
# spanning two lines.
Synopsis: foo bar
Something_else: chbouib

# Comment right before.
Name: bar
Version: 1.5
# Comment at the end.")))
    (list (recutils->alist p)
          (recutils->alist p))))

(test-equal "recutils->alist with + lines"
  '(("Name" . "foo")
    ("Description" . "1st line,\n2nd line,\n 3rd line with extra space,\n4th line without space."))
  (recutils->alist (open-input-string "
Name: foo
Description: 1st line,
+ 2nd line,
+  3rd line with extra space,
+4th line without space.")))

(test-equal "alist->record" '((1 2) b c)
  (alist->record '(("a" . 1) ("b" . b) ("c" . c) ("a" . 2))
                 list
                 '("a" "b" "c")
                 '("a")))

(test-end)