/usr/share/emacs/site-lisp/wl/elmo/elmo-signal.el is in wl-beta 2.15.9+0.20151119-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | ;;; elmo-signal.el --- "signal-slot" abstraction for routing events
;; Copyright (C) 1998-2003 Daiki Ueno <ueno@unixuser.org>
;; Author: Daiki Ueno <ueno@unixuser.org>
;; Hiroya Murata <lapis-lazuli@pop06.odn.ne.jp>
;; Keywords: mail, net news
;; This file is part of ELMO (Elisp Library for Message Orchestration).
;; 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;
;;; Commentary:
;;; This module implements Qt like "signal-slot" abstraction for
;;; routing events.
;;; Based on riece-signal.el.
;;; Code:
(eval-when-compile (require 'cl))
(defvar elmo-signal-slot-obarray
(make-vector 31 0))
(defun elmo-make-slot (source listener function &optional filter handback)
"Make an instance of slot object.
Arguments are corresponding to callback function, filter function, and
a handback object, respectively.
This function is for internal use only."
(vector source listener function filter handback))
(defun elmo-slot-source (slot)
"Return the source of SLOT.
This function is for internal use only."
(aref slot 0))
(defun elmo-slot-listener (slot)
"Return the listener of SLOT.
This function is for internal use only."
(aref slot 1))
(defun elmo-slot-function (slot)
"Return the callback function of SLOT.
This function is for internal use only."
(aref slot 2))
(defun elmo-slot-filter (slot)
"Return the filter function of SLOT.
This function is for internal use only."
(aref slot 3))
(defun elmo-slot-handback (slot)
"Return the handback object of SLOT.
This function is for internal use only."
(aref slot 4))
(put 'elmo-define-signal 'lisp-indent-function 'defun)
(defmacro elmo-define-signal (name args &optional doc)
`(setplist ',name (list 'elmo-signal-args ',args
'elmo-signal-docstring ,doc)))
(defun elmo-signal-name (signal)
"Return the name of SIGNAL."
signal)
(defun elmo-signal-args (signal)
"Return the argument list of SIGNAL."
(get signal 'elmo-signal-args))
(defun elmo-signal-docstring (signal)
"Return the docment string of SIGNAL."
(get signal 'elmo-signal-docstring))
(defun elmo-signal-bindings (source listener args handback arg-list)
(let ((i 0)
bindings)
(when (car arg-list)
(setq bindings (cons (list (car arg-list) listener) bindings)))
(when (setq arg-list (cdr arg-list))
(setq bindings (cons (list (car arg-list) source) bindings)))
(while (and (setq arg-list (cdr arg-list))
(not (eq (car arg-list) '&optional)))
(setq bindings (cons (list (car arg-list) (list 'nth i args)) bindings)
i (1+ i)))
(when (and handback
(setq arg-list (cdr arg-list)))
(setq bindings (cons (list (car arg-list) handback) bindings)))
bindings))
(defmacro elmo-define-signal-handler (args &rest body)
"Define a signal handler.
ARGS is a symbol list as (LISTENER SOURCE ARG... &optional HANDBACK)."
(let ((source (make-symbol "--source--"))
(listener (make-symbol "--listener--"))
(argument (make-symbol "--argument--"))
(handback (make-symbol "--handback--")))
`(lambda (,listener ,source ,argument ,handback)
(let ,(elmo-signal-bindings source listener argument handback args)
,@body))))
(put 'elmo-define-signal-handler 'lisp-indent-function 'defun)
(def-edebug-spec elmo-define-signal-handler
(&define (arg [&rest arg] [&optional ["&optional" arg &rest arg]])
def-body))
(defmacro elmo-define-signal-filter (args &rest body)
"Define a signal filter.
ARGS is a symbol list as (LISTENER SOURCE ARG...)."
(let ((source (make-symbol "--source--"))
(listener (make-symbol "--listener--"))
(argument (make-symbol "--argument--")))
`(lambda (,listener ,source ,argument)
(let ,(elmo-signal-bindings source listener argument nil args)
,@body))))
(put 'elmo-define-signal-filter 'lisp-indent-function 'defun)
(def-edebug-spec elmo-define-signal-filter
(&define (arg [&rest arg])
def-body))
(defun elmo-connect-signal (source signal-name listener handler
&optional filter handback)
"Add HANDLER as a callback function for signal identified by SIGNAL-NAME.
If SOURCE has non-nil value, HANDLER will be invoked only if SOURCE is same as
source argument of `elmo-emit-signal'. Comparison is done with `eq'. If SOURCE
is nil, react on signals from any sources.
You can specify further filter function by FILTER."
(let ((symbol (intern (symbol-name signal-name) elmo-signal-slot-obarray)))
(set symbol (cons (elmo-make-slot source listener handler filter handback)
(if (boundp symbol)
(symbol-value symbol))))))
(defun elmo-disconnect-signal (signal-name listener &optional function)
"Remove FUNCTION from the listener of the signal identified by SIGNAL-NAME."
(let* ((symbol (intern-soft (symbol-name signal-name)
elmo-signal-slot-obarray))
(slots (symbol-value symbol)))
(while slots
(when (and (eq (elmo-slot-listener (car slots)) listener)
(or (null function)
(eq (elmo-slot-function (car slots)) function)))
(set symbol (delq (car slots) (symbol-value symbol))))
(setq slots (cdr slots)))))
(defun elmo-clear-signal-slots ()
"Remove all functions from listeners list."
(fillarray elmo-signal-slot-obarray 0))
(defun elmo-emit-signal (signal-name source &rest args)
"Emit signal with SIGNAL-NAME."
(let ((symbol (intern-soft (symbol-name signal-name)
elmo-signal-slot-obarray))
signal)
(when symbol
(dolist (slot (symbol-value symbol))
(ignore-errors
(when (and (or (null (elmo-slot-source slot))
(eq (elmo-slot-source slot) source))
(or (null (elmo-slot-filter slot))
(ignore-errors
(funcall (elmo-slot-filter slot)
(elmo-slot-listener slot)
source
args))))
(funcall (elmo-slot-function slot)
(elmo-slot-listener slot)
source
args
(elmo-slot-handback slot))))))))
(require 'product)
(product-provide (provide 'elmo-signal) (require 'elmo-version))
;;; elmo-signal.el ends here
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