compat.lisp

   1 ;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: HUNCHENTOOT; Base: 10 -*-
   2
   3 ;;; Copyright (c) 2004-2010, Dr. Edmund Weitz. All rights reserved.
   4
   5 ;;; Redistribution and use in source and binary forms, with or without
   6 ;;; modification, are permitted provided that the following conditions
   7 ;;; are met:
   8
   9 ;;;   * Redistributions of source code must retain the above copyright
  10 ;;;     notice, this list of conditions and the following disclaimer.
  11
  12 ;;;   * Redistributions in binary form must reproduce the above
  13 ;;;     copyright notice, this list of conditions and the following
  14 ;;;     disclaimer in the documentation and/or other materials
  15 ;;;     provided with the distribution.
  16
  17 ;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
  18 ;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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  21 ;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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  24 ;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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  27 ;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28
  29 (in-package :hunchentoot)
  30
  31 (defmacro when-let ((var form) &body body)
  32   "Evaluates FORM and binds VAR to the result, then executes BODY
  33 if VAR has a true value."
  34   `(let ((,var ,form))
  35      (when ,var ,@body)))
  36
  37 (defmacro with-unique-names ((&rest bindings) &body body)
  38   "Syntax: WITH-UNIQUE-NAMES ( { var | (var x) }* ) declaration* form*
  39
  40 Executes a series of forms with each VAR bound to a fresh,
  41 uninterned symbol. The uninterned symbol is as if returned by a call
  42 to GENSYM with the string denoted by X - or, if X is not supplied, the
  43 string denoted by VAR - as argument.
  44
  45 The variable bindings created are lexical unless special declarations
  46 are specified. The scopes of the name bindings and declarations do not
  47 include the Xs.
  48
  49 The forms are evaluated in order, and the values of all but the last
  50 are discarded \(that is, the body is an implicit PROGN)."
  51   ;; reference implementation posted to comp.lang.lisp as
  52   ;; <cy3bshuf30f.fsf@ljosa.com> by Vebjorn Ljosa - see also
  53   ;; <http://www.cliki.net/Common%20Lisp%20Utilities>
  54   `(let ,(mapcar #'(lambda (binding)
  55                      (check-type binding (or cons symbol))
  56                      (if (consp binding)
  57                        (destructuring-bind (var x) binding
  58                          (check-type var symbol)
  59                          `(,var (gensym ,(etypecase x
  60                                           (symbol (symbol-name x))
  61                                           (character (string x))
  62                                           (string x)))))
  63                        `(,binding (gensym ,(symbol-name binding)))))
  64                  bindings)
  65          ,@body))
  66
  67 (defmacro with-rebinding (bindings &body body)
  68   "Syntax: WITH-REBINDING ( { var | (var prefix) }* ) form*
  69
  70 Evaluates a series of forms in the lexical environment that is
  71 formed by adding the binding of each VAR to a fresh, uninterned
  72 symbol, and the binding of that fresh, uninterned symbol to VAR's
  73 original value, i.e., its value in the current lexical environment.
  74
  75 The uninterned symbol is created as if by a call to GENSYM with the
  76 string denoted by PREFIX - or, if PREFIX is not supplied, the string
  77 denoted by VAR - as argument.
  78
  79 The forms are evaluated in order, and the values of all but the last
  80 are discarded \(that is, the body is an implicit PROGN)."
  81   ;; reference implementation posted to comp.lang.lisp as
  82   ;; <cy3wv0fya0p.fsf@ljosa.com> by Vebjorn Ljosa - see also
  83   ;; <http://www.cliki.net/Common%20Lisp%20Utilities>
  84   (loop for binding in bindings
  85         for var = (if (consp binding) (car binding) binding)
  86         for name = (gensym)
  87         collect `(,name ,var) into renames
  88         collect ``(,,var ,,name) into temps
  89         finally (return `(let ,renames
  90                           (with-unique-names ,bindings
  91                             `(let (,,@temps)
  92                               ,,@body))))))
  93
  94 (defun get-peer-address-and-port (socket)
  95   "Returns the peer address and port of the socket SOCKET as two
  96 values.  The address is returned as a string in dotted IP address
  97 notation."
  98   (multiple-value-bind (address port) (usocket:get-peer-name socket)
  99     (values (ecase (length address)
 100               (4 (usocket:vector-quad-to-dotted-quad address))
 101               (16 (usocket:vector-to-ipv6-host address)))
 102             port)))
 103
 104 (defun get-local-address-and-port (socket)
 105   "Returns the local address and port of the socket SOCKET as two
 106 values.  The address is returned as a string in dotted IP address
 107 notation."
 108   (multiple-value-bind (address port) (usocket:get-local-name socket)
 109     (values (ecase (length address)
 110               (4 (usocket:vector-quad-to-dotted-quad address))
 111               (16 (usocket:vector-to-ipv6-host address)))
 112             port)))
 113
 114 (defun make-socket-stream (socket acceptor)
 115   "Returns a stream for the socket SOCKET.  The ACCEPTOR argument is
 116 ignored."
 117   (declare (ignore acceptor))
 118   (usocket:socket-stream socket))
 119
 120 (defun make-lock (name)
 121   "Simple wrapper to allow LispWorks and Bordeaux Threads to coexist."
 122   (bt:make-lock name))
 123
 124 (defmacro with-lock-held ((lock) &body body)
 125   "Simple wrapper to allow LispWorks and Bordeaux Threads to coexist."
 126   `(bt:with-lock-held (,lock) ,@body))
 127
 128 (defun make-condition-variable (&key name)
 129   (declare (ignore name))
 130   (bt:make-condition-variable))
 131
 132 (defun condition-variable-signal (condition-variable)
 133   (bt:condition-notify condition-variable))
 134
 135 (defun condition-variable-wait (condition-variable lock)
 136   (bt:condition-wait condition-variable lock))