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joko |
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<?php |
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/** |
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* This file contains the Exporter. |
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* |
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* @author Andreas Motl <andreas.motl@ilo.de> |
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* @package org.netfrag.glib |
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* @name Exporter |
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* |
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*/ |
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/** |
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joko |
1.2 |
* $Id: Exporter.php,v 1.1 2003/04/05 19:53:45 joko Exp $ |
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joko |
1.1 |
* |
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* $Log: Exporter.php,v $ |
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joko |
1.2 |
* Revision 1.1 2003/04/05 19:53:45 joko |
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* moved here from ../ |
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* |
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joko |
1.1 |
* Revision 1.6 2003/04/04 17:33:49 joko |
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* updated/enhanced/fixed behaviour of 'function create_stub_function' |
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* |
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* Revision 1.5 2003/03/28 03:05:20 joko |
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* minor update: fixed labels, modified debugging level |
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* |
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* Revision 1.4 2003/03/10 22:58:45 joko |
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* + fixed metadata for phpDocumentor |
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* |
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* Revision 1.3 2003/03/05 23:16:46 joko |
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* updated docu - phpDocumentor is very strict about its 'blocks'... |
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* |
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* Revision 1.2 2003/03/05 18:54:41 joko |
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* updated docu - phpDocumentor is very strict about its 'blocks'... |
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* |
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* Revision 1.1 2003/03/03 21:08:21 joko |
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* refactored from flib/utils |
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* |
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* |
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*/ |
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/** |
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* --- shortcut functions |
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* |
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*/ |
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//function &export_symbol() { return Exporter::export_symbol(func_get_args()); } |
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/** |
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* The Exporter |
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* |
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* This tries to mimic a very small subset of the |
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* functionality of CPAN's Exporter. |
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* |
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* <pre> |
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* x export_symbol |
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* x export_symbols |
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* |
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* Synopsis: |
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* <code> |
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* define('EXPORT_OK', 'loadModule mkInstance' ); |
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* require_once("php_extensions.php"); |
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* </code> |
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* |
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* Example output: |
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* |
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* Exporting symbol 'php::loadModule' to 'global::loadModule' (type='__php_function'). |
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* selected stub: |
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* <code> |
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* function &loadModule() { return php::loadModule(Exporter::wrap_args(func_get_args())); } |
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* </code> |
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* |
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* Exporting symbol 'php::mkInstance' to 'global::mkInstance' (type='__php_function'). |
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* selected stub: |
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* <code> |
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* function &mkInstance() { return php::mkInstance(Exporter::wrap_args(func_get_args())); } |
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* </code> |
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* </pre> |
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* |
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* |
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* @author Andreas Motl <andreas.motl@ilo.de> |
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* @copyright (c) 2003 - All Rights reserved. |
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* @license GNU LGPL (GNU Lesser General Public License) |
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* |
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* @link http://www.netfrag.org/~joko/ |
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* @link http://www.gnu.org/licenses/lgpl.txt |
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* |
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* @package org.netfrag.glib |
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* @name Exporter |
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* |
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* @link http://search.cpan.org/author/JHI/perl-5.8.0/lib/Exporter.pm |
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* |
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* @todo (x) look at http://www.php.net/manual/en/function.method-exists.php |
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* @todo (x) $bool_exists = (in_array(strtolower($methodName), get_class_methods($className))); |
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* @todo (x) -> implemented in php::class_has_method |
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* |
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*/ |
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class Exporter { |
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function export_symbol($from = null, $symbol = null, $to = array()) { |
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// 1. resolve source |
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// --- object |
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if (is_object($from)) { |
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$source_type = 'object'; |
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$source_pack = get_class($from); |
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// --- array/hash |
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} elseif (is_array($from)) { |
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if (is_hash($from)) { |
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$source_type = 'hash'; |
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$error = 1; |
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} else { |
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$source_type = 'array'; |
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$error = 1; |
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} |
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// --- namespace identifier (e.g. Data::Driver::RPC) or ... |
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} elseif (is_string($from) && strstr($from, '::')) { |
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$source_type = 'namespace'; |
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$error = 1; |
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// --- ... plain php classname |
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} elseif (is_string($from)) { |
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$source_type = '__php_function'; |
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$source_pack = $from; |
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joko |
1.2 |
$target_symbol = $to['php_function']; |
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joko |
1.1 |
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// --- unknown |
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} else { |
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user_error("Exporter could not handle this: " . Dumper($this)); |
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} |
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// 2. resolve target |
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if (!$target_symbol) { $target_symbol = $symbol; } |
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if (!$target_pack) { $target_pack = '[global]'; } |
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// 3. resolve target symbol |
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if (php::is_hash($target_symbol)) { |
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//print "IS_ARRAY: " . Dumper($target_symbol); |
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//$symbol = $target_symbol[1]; |
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//$target_symbol = $target_symbol[0]; |
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foreach ($target_symbol as $sym_src => $sym_tgt) { |
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Exporter::export_symbol($from, $sym_src, array( php_function => $sym_tgt ) ); |
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} |
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return 1; |
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} |
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// debug |
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$msg = "Exporter: exporting '$source_type' symbol '$source_pack::$symbol' to '$target_pack::$target_symbol'."; |
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if (DEBUG_EXPORTER == 1) { |
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print "$msg<br/>"; |
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} |
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if (LOG_EXPORTER == 1) { |
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php::append_log($msg); |
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} |
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// catch errors |
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if ($error) { |
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user_error(Dumper($this)); |
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} |
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// dispatch symbol export type (mode) |
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switch ($source_type) { |
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case 'object': |
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if (method_exists($this, $symbol)) { |
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user_error("object - method exists!"); |
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} |
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break; |
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case '__php_function': |
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if (!Exporter::create_stub_function($target_symbol, $source_pack, $symbol)) { |
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user_error("Exporter error: creating stub function for '$symbol' failed."); |
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return; |
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} |
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break; |
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} |
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return 1; |
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} |
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function export_symbols($from = null, $symbols = array(), $to = array()) { |
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php::array_cast_safe($symbols); |
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foreach ($symbols as $symbol) { |
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/* |
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// if no 'to' argument was given, assume 'php_function' which results in a 1:1 function/method mapping |
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if (!sizeof($to)) { |
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$to[php_function] = $symbol; |
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} |
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*/ |
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//print Dumper($symbol); |
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Exporter::export_symbol($from, $symbol, $to); |
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} |
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} |
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function create_stub_function($target_name, $source_class, $source_name) { |
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static $target_cache; |
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joko |
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if (!isset($target_cache)) { $target_cache = array(); } |
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joko |
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if (!php::class_has_method($source_class, $source_name)) { |
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user_error("Exporter::create_stub_function - Error: class '$source_class' does not implement method '$source_name', will skip exporting this symbol."); |
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return; |
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} |
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// prevent redeclarations |
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if (array_key_exists($target_name, $target_cache)) { |
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$msg = "Exporter::create_stub_function - Warning: already declared: $target_name"; |
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php::append_log($msg, PEAR_LOG_DEBUG); |
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return 1; |
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} else { |
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$target_cache[$target_name] = 1; |
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joko |
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} |
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//function &$target_name() { return $source_class::$source_name(Exporter::wrap_args(func_get_args())); } |
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//function &$target_name() { return $source_class::$source_name(php::array_shrink(func_get_args())); } |
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//function &$target_name() { \$args = func_get_args(); return call_user_func_array('$source_class::$source_name', &\$args); } |
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//function &$target_name() { \$args = func_get_args(); return call_user_func_array(array($source_class, $source_name), &\$args); } |
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//function &$target_name() { \$args = php::array_shrink(func_get_args()); return call_user_func_array(array($source_class, $source_name), &\$args); } |
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//function &$target_name() { \$args = Exporter::wrap_args(func_get_args()); return call_user_func_array(array($source_class, $source_name), &\$args); } |
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// taha that's it! |
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$stub = |
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<<<TPL_FUNC |
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function &$target_name() { |
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\$passthru = php::array_shrink(func_get_args()); |
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if (is_array(\$passthru)) { |
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return call_user_func_array(array('$source_class', '$source_name'), &\$passthru); |
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} else { |
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return call_user_func(array('$source_class', '$source_name'), &\$passthru); |
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} |
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} |
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// signal good |
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return 1; |
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TPL_FUNC; |
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/* |
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// possible alternative? not yet... |
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$function = <<<TPL_FUNC |
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class $target_class() { |
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function &$target_name() { return $source_class::$source_name(func_get_args()); } |
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} |
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TPL_FUNC; |
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*/ |
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// debug |
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//print "selected stub: <br/>$stub<br/>"; |
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// V1 |
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//eval($stub); |
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//return 1; |
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// V2 |
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return eval($stub); |
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} |
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// dives to level into a numeric array since php wraps the args into |
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// one each time by using 'func_get_args', we do this twice: |
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// - 1. inside the stub, which calls ... |
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// - 2. ... the argument wrapper: this stuff here... |
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function &wrap_args() { |
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$args = func_get_args(); |
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//print Dumper($args); |
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// shrink array to single item? |
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//if (sizeof($args) == 1) { $args = $args[0]; } |
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// again? (remember: twice!) |
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//if (sizeof($args) == 1) { $args = $args[0]; } |
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$args = $args[0][0]; |
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//print Dumper($args); |
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return $args; |
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} |
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} |
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?> |
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