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| Code | |||||
<?php /* +----------------------------------------------------------------------+ | Copyright (c) 2000 J.A.Greant | | (See end of file for usage notes and licensing information.) | +----------------------------------------------------------------------+ */ class inline { var $globals, $locals; function inline () { if (func_num_args ()) { $vars = func_get_args (); foreach ($vars as $var) { $var = trim ($var); if (isset ($GLOBALS[$var])) { $this->globals[$var] = $GLOBALS[$var]; unset ($GLOBALS[$var]); } $this->locals[$var] = TRUE; } } else { reset ($GLOBALS); while (list ($key) = each ($GLOBALS)) { if ($key != 'GLOBALS') { $this->globals[$key] = $GLOBALS[$key]; unset ($GLOBALS[$key]); $this->locals[$key] = TRUE; } } } } function get_global ($var) { if (isset ($this->globals[$var])) return $this->globals[$var]; return NULL; } function get_globals () { return $this->globals; } function export ($var) { if ($this->locals[$var]) { $this->globals[$var] = $GLOBALS[$var]; return TRUE; } return FALSE; } function export_all ($var) { if (is_array ($this->locals)) { reset ($this->locals); while (list ($key) = each ($this->locals)) $this->globals[$key] = $GLOBALS[$key]; return TRUE; } return FALSE; } function exit_scope () { /* Restore the global variables */ reset ($this->globals); if (is_array ($this->globals)) while (list ($key) = each ($this->globals)) $GLOBALS[$key] = $this->globals[$key]; /* Destroy class variables */ unset ($this->globals); unset ($this->locals); unset ($this); } } /* +----------------------------------------------------------------------+ | FILE NAME: inline.pkg | +----------------------------------------------------------------------+ | Author: J.A.Greant | | Email : zak@nucleus.com | | Date : 2000/11/23 | +----------------------------------------------------------------------+ | The inline class provides a simple method for temporarily entering | | local scopes for variables. The new scope can be restricted to a | | few variables or (for debugging) the entire scope. This class is | | most useful for debugging or for making emergency hacks to code. | | | | For example: Pretend that you are dealing with a large block of | | obfuscated code and need to make it work in a very short amount of | | time. Rather than worry about possible interactions with existing | | variables, enter a local scope, do your quick hack and then return | | the global scope. | | | | inline() method / class constructor | | ----------------------------------- | | Accepts a list of 0 or more variable names. All specified variable | | names will be hidden until the exit_scope() method is called. If no | | variable names are specified, then the entire global scope will be | | hidden. | | | |--> WARNING: Hiding the entire global scope in this fashion is <--| |--> both wasteful and bad coding style. It should really only be <--| |--> used for debugging and emergencies. <--| | | | USAGE EXAMPLE: | | // Create a local scope for variables $x, $y and $z | | $my = new inline ('x', 'y', 'z'); | | // do whatever you will with $x, $y and $z | | // Return to global scope | | $my->exit_scope (); | | | | get_global() method | | ------------------- | | Return the value of a hidden global variable. | | | | USAGE EXAMPLE: | | // Create a local scope for variables $x, $y and $z | | $my = new inline ('x', 'y', 'z'); | | // do whatever you will with $x, $y and $z | | // Find the global value of $x | | print $my->get_global ('x'); | | // Return to global scope | | $my->exit_scope (); | | | | get_globals() method | | -------------------- | | Return the value of all hidden global variables. | | | | USAGE EXAMPLE: | | // Create a local scope for variables $x, $y and $z | | $my = new inline ('x', 'y', 'z'); | | // do whatever you will with $x, $y and $z | | // Find the global value of $x | | print $my->get_globals (); | | // Return to global scope | | $my->exit_scope (); | | | | export() method | | --------------- | | Export a local variable to the global scope. | | | | USAGE EXAMPLE: | | // Create a local scope for variables $x, $y and $z | | $my = new inline ('x', 'y', 'z'); | | // do whatever you will with $x, $y and $z | | // Find the global value of $x | | print $my->export ('x'); | | // Return to global scope | | $my->exit_scope (); | | | | export_all() method | | ------------------- | | Export all local variables to the global scope. | | | | USAGE EXAMPLE: | | // Create a local scope for variables $x, $y and $z | | $my = new inline ('x', 'y', 'z'); | | // do whatever you will with $x, $y and $z | | // Find the global value of $x | | print $my->export_all (); | | // Return to global scope | | $my->exit_scope (); | | | | exit_scope() method | | ------------- | | Exit the local scope and destroy the class variables. | | | | USAGE EXAMPLE: | | // Create a local scope for variables $x, $y and $z | | $my = new inline ('x', 'y', 'z'); | | // do whatever you will with $x, $y and $z | | // Find the global value of $x | | print $my->export ('x'); | | // Return to global scope | | $my->exit_scope (); | +----------------------------------------------------------------------+ +----------------------------------------------------------------------+ |--> WARNING: Be careful if you nest scopes. Make sure to exit the <--| |--> scopes in the reverse order that you called them. <--| +----------------------------------------------------------------------+ | For Example: | | // You should probably avoid this! :) | | $x = 100; | | $mine = new scope (); | | $x = 10; | | $yours = new scope (); | | $x = 1; | | $mine->exit_scope (); // $x will now equal 100 | | $yours->exit_scope (); // $x will now equal 10 | +----------------------------------------------------------------------+ +----------------------------------------------------------------------+ | CVS LOG INFO | +----------------------------------------------------------------------+ $Log: inline.pkg,v $ Revision 1.2 2000/11/24 09:22:26 zak Reworked code. Added documentation and bsd-style license. Revision 1.1 2000/11/24 08:09:04 zak Initial commit of inline class +----------------------------------------------------------------------+ | Copyright (c) 2000 J.A.Greant (zak@nucleus.com) | | All rights reserved. | +----------------------------------------------------------------------+ | Redistribution and use in source and binary forms, with or without | | modification, is permitted provided that the following conditions | | are met: | +----------------------------------------------------------------------+ | Redistributions of source code must retain the above copyright | | notice, this list of conditions and the following disclaimer. | | | | Redistributions in binary form must reproduce the above copyright | | notice, this list of conditions and the following disclaimer in the | | documentation and/or other materials provided with the distribution. | | | | Neither the name of the author nor the names of any contributors to | | this software may be used to endorse or promote products derived | | from this software without specific prior written permission. | | | | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | | AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | | ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | | POSSIBILITY OF SUCH DAMAGE. | +----------------------------------------------------------------------+ */ ?> | |||||
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