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b78d91d517
* module/ice-9/psyntax.scm (underscore?): New helper, like ellipsis?.
(syntax-case): Treat the _ pattern as a matches-all pattern,
disallowing it from the keyword list. Another well-thought part of the
R6RS.
($sc-dispatch): Dispatch _ patterns.
* module/ice-9/psyntax-pp.scm: Regenerated.
* test-suite/tests/syncase.test ("_ is a placeholder"): Add a test.
154 lines
5 KiB
Scheme
154 lines
5 KiB
Scheme
;;;; syncase.test --- test suite for (ice-9 syncase) -*- scheme -*-
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;;;;
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;;;; Copyright (C) 2001, 2006, 2009, 2010 Free Software Foundation, Inc.
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;; These tests are in a module so that the syntax transformer does not
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;; affect code outside of this file.
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;;
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(define-module (test-suite test-syncase)
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#:use-module (test-suite lib)
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#:use-module (system base compile)
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#:use-module ((srfi srfi-1) :select (member)))
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(define-syntax plus
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(syntax-rules ()
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((plus x ...) (+ x ...))))
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(pass-if "basic syncase macro"
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(= (plus 1 2 3) (+ 1 2 3)))
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(pass-if "@ works with syncase"
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(eq? run-test (@ (test-suite lib) run-test)))
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(define-syntax string-let
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(lambda (stx)
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(syntax-case stx ()
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((_ id body ...)
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#`(let ((id #,(symbol->string
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(syntax->datum #'id))))
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body ...)))))
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(pass-if "macro using quasisyntax"
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(equal? (string-let foo (list foo foo))
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'("foo" "foo")))
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(define-syntax string-case
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(syntax-rules (else)
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((string-case expr ((string ...) clause-body ...) ... (else else-body ...))
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(let ((value expr))
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(cond ((member value '(string ...) string=?)
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clause-body ...)
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...
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(else
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else-body ...))))
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((string-case expr ((string ...) clause-body ...) ...)
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(let ((value expr))
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(cond ((member value '(string ...) string=?)
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clause-body ...)
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...)))))
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(define-syntax alist
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(syntax-rules (tail)
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((alist ((key val) ... (tail expr)))
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(cons* '(key . val) ... expr))
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((alist ((key val) ...))
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(list '(key . val) ...))))
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(with-test-prefix "tail patterns"
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(with-test-prefix "at the outermost level"
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(pass-if "non-tail invocation"
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(equal? (string-case "foo" (("foo") 'foo))
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'foo))
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(pass-if "tail invocation"
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(equal? (string-case "foo" (("bar") 'bar) (else 'else))
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'else)))
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(with-test-prefix "at a nested level"
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(pass-if "non-tail invocation"
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(equal? (alist ((a 1) (b 2) (c 3)))
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'((a . 1) (b . 2) (c . 3))))
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(pass-if "tail invocation"
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(equal? (alist ((foo 42) (tail '((bar . 66)))))
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'((foo . 42) (bar . 66))))))
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(with-test-prefix "serializable labels and marks"
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(compile '(begin
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(define-syntax duplicate-macro
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(syntax-rules ()
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((_ new-name old-name)
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(define-syntax new-name
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(syntax-rules ()
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((_ . vals)
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(letrec-syntax ((apply (syntax-rules ()
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((_ macro args)
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(macro . args)))))
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(apply old-name vals))))))))
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(define-syntax kwote
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(syntax-rules ()
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((_ arg1) 'arg1)))
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(duplicate-macro kwote* kwote))
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#:env (current-module))
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(pass-if "compiled macro-generating macro works"
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(eq? (eval '(kwote* foo) (current-module))
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'foo)))
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(with-test-prefix "changes to expansion environment"
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(pass-if "expander detects changes to current-module with @@"
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(compile '(begin
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(define-module (new-module))
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(@@ (new-module)
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(define-syntax new-module-macro
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(lambda (stx)
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(syntax-case stx ()
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((_ arg) (syntax arg))))))
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(@@ (new-module)
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(new-module-macro #t)))
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#:env (current-module))))
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(define-module (test-suite test-syncase-2)
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#:export (make-the-macro))
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(define (hello)
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'hello)
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(define-syntax make-the-macro
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(syntax-rules ()
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((_ name)
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(define-syntax name
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(syntax-rules ()
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((_) (hello)))))))
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(define-module (test-suite test-syncase)) ;; back to main module
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(use-modules (test-suite test-syncase-2))
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(make-the-macro foo)
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(with-test-prefix "macro-generating macro"
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(pass-if "module hygiene"
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(eq? (foo) 'hello)))
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(pass-if "_ is a placeholder"
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(equal? (eval '(begin
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(define-syntax ciao
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(lambda (stx)
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(syntax-case stx ()
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((_ _)
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"ciao"))))
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(ciao 1))
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(current-module))
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"ciao"))
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