From: Adam Porter <adam@alphapapa.net>
To: emacs-devel@gnu.org
Subject: Re: [PATCH] pcase.el: Add type pattern
Date: Mon, 09 Mar 2020 17:46:18 -0500 [thread overview]
Message-ID: <87d09lw3id.fsf@alphapapa.net> (raw)
In-Reply-To: 87a74puq1q.fsf@web.de
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Michael Heerdegen <michael_heerdegen@web.de> writes:
>> (pred FUN) matches if FUN called on EXPVAL returns non-nil.
>> + (type TYPE) matches if EXPVAL is of TYPE.
>> (app FUN PAT) matches if FUN called on EXPVAL matches PAT.
>
> I like your idea, but I would not document the new pattern at this
> prominent position. Evaluating the pattern definition will add an entry
> in the dynamically created docstring anyway. I think this is good
> enough.
Thanks, I forgot about that part of the docstring. I removed that line
as you suggested in this updated patch.
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From 628b25d2766884262f7da8ed158d3896f8944913 Mon Sep 17 00:00:00 2001
From: Adam Porter <adam@alphapapa.net>
Date: Mon, 9 Mar 2020 13:01:32 -0500
Subject: [PATCH] * lisp/emacs-lisp/cl-macs.el: Add type pattern
* lisp/emacs-lisp/cl-macs.el:
((pcase-defmacro type)): Add 'type' pattern.
* test/lisp/emacs-lisp/pcase-tests.el (pcase-tests-type): Add test.
* doc/lispref/control.texi (pcase Macro): Update manual.
Co-authored-by: Stefan Monnier <monnier@iro.umontreal.ca>
---
doc/lispref/control.texi | 6 ++++++
etc/NEWS | 7 +++++++
lisp/emacs-lisp/cl-macs.el | 6 ++++++
test/lisp/emacs-lisp/pcase-tests.el | 7 +++++++
4 files changed, 26 insertions(+)
diff --git a/doc/lispref/control.texi b/doc/lispref/control.texi
index c601e3a..72bfd2e 100644
--- a/doc/lispref/control.texi
+++ b/doc/lispref/control.texi
@@ -555,6 +555,12 @@ pcase Macro
Likewise, it makes no sense to bind keyword symbols
(@pxref{Constant Variables}).
+@item (type @var{type})
+Matches if @var{expval} is of type @var{type}. The comparison is done
+with function @code{cl-typep}.
+
+Example: @code{(type integer)}
+
@item (pred @var{function})
Matches if the predicate @var{function} returns non-@code{nil}
when called on @var{expval}.
diff --git a/etc/NEWS b/etc/NEWS
index 47b87af..9190bf1 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -174,6 +174,13 @@ key binding
/ v package-menu-filter-by-version
/ / package-menu-filter-clear
+** pcase.el
+
+*** Added Pcase 'type' pattern.
+
+A pattern like '(type integer)' is equivalent to one like
+'(pred integerp)'.
+
\f
* New Modes and Packages in Emacs 28.1
diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 4c2f589..d2ac485 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -3403,6 +3403,12 @@ cl-struct-slot-value
(run-hooks 'cl-macs-load-hook)
+;;; Pcase type pattern.
+
+(pcase-defmacro type (type)
+ "Pcase pattern that matches objects of TYPE."
+ `(pred (pcase--flip cl-typep ',type)))
+
;; Local variables:
;; generated-autoload-file: "cl-loaddefs.el"
;; End:
diff --git a/test/lisp/emacs-lisp/pcase-tests.el b/test/lisp/emacs-lisp/pcase-tests.el
index 0b69bd9..5db8605 100644
--- a/test/lisp/emacs-lisp/pcase-tests.el
+++ b/test/lisp/emacs-lisp/pcase-tests.el
@@ -71,6 +71,13 @@ pcase-tests-member
(ert-deftest pcase-tests-vectors ()
(should (equal (pcase [1 2] (`[,x] 1) (`[,x ,y] (+ x y))) 3)))
+(ert-deftest pcase-tests-type ()
+ (should (equal (pcase 1
+ ((type integer) 'integer))
+ 'integer))
+ (should-error (pcase 1
+ ((type notatype) 'integer))))
+
;; Local Variables:
;; no-byte-compile: t
;; End:
--
2.7.4
next prev parent reply other threads:[~2020-03-09 22:46 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-09 18:19 [PATCH] pcase.el: Add type pattern Adam Porter
2020-03-09 18:38 ` Eli Zaretskii
2020-03-09 19:20 ` Adam Porter
2020-03-09 19:35 ` Adam Porter
2020-03-09 18:38 ` Adam Porter
2020-03-09 18:45 ` Eric Abrahamsen
2020-03-10 15:48 ` Adam Porter
2020-03-10 17:40 ` Eric Abrahamsen
2020-03-09 18:53 ` Stefan Monnier
2020-03-09 19:31 ` Adam Porter
2020-03-09 21:00 ` Stefan Monnier
2020-03-09 21:54 ` Adam Porter
2020-03-09 22:22 ` Michael Heerdegen
2020-03-09 22:46 ` Adam Porter [this message]
2020-03-10 14:54 ` Michael Heerdegen
2020-03-10 15:01 ` Michael Heerdegen
2020-03-10 15:46 ` Adam Porter
2020-03-10 16:24 ` Michael Heerdegen
2020-03-10 17:03 ` Adam Porter
2020-03-10 17:43 ` Michael Heerdegen
2020-03-10 18:04 ` Adam Porter
2020-03-10 18:17 ` Adam Porter
2020-03-10 19:07 ` Michael Heerdegen
2020-03-10 19:19 ` Adam Porter
2020-03-10 19:10 ` Eric Abrahamsen
2020-03-10 19:21 ` Adam Porter
2020-03-11 2:08 ` Michael Heerdegen
2020-03-16 12:59 ` Stefan Monnier
2021-07-11 1:33 ` [PATCH] pcase.el: Add cl-type and type patterns Adam Porter
2021-07-11 2:12 ` Adam Porter
2021-07-11 6:11 ` Eli Zaretskii
2021-07-16 9:32 ` Adam Porter
2021-07-17 11:58 ` Eli Zaretskii
2021-07-16 22:41 ` Stefan Monnier
2021-07-17 16:07 ` Adam Porter
2021-07-30 21:24 ` Stefan Monnier
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