From f33c5896aceb2c7d8cd71fa2b286793376cb9bc7 Mon Sep 17 00:00:00 2001
From: "Tomas V.V.Cox" <cox@php.net>
Date: Fri, 7 Jun 2002 18:07:38 +0000
Subject: [PATCH] Experimental dependencies database handling functions (not
 yet in production)

---
 pear/PEAR/Registry.php | 113 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 110 insertions(+), 3 deletions(-)

diff --git a/pear/PEAR/Registry.php b/pear/PEAR/Registry.php
index 42b9c8d0cd..2f337e4806 100644
--- a/pear/PEAR/Registry.php
+++ b/pear/PEAR/Registry.php
@@ -14,6 +14,8 @@
 // | license@php.net so we can mail you a copy immediately.               |
 // +----------------------------------------------------------------------+
 // | Author: Stig Bakken <ssb@fast.no>                                    |
+// |         Tomas V.V.Cox <cox@idecnet.com>                              |
+// |                                                                      |
 // +----------------------------------------------------------------------+
 //
 // $Id$
@@ -208,7 +210,7 @@ class PEAR_Registry extends PEAR
      */
     function _lock($mode = LOCK_EX)
     {
-        if(!strstr(php_uname(), 'Windows 95/98')) {    
+        if(!strstr(php_uname(), 'Windows 95/98')) {
             if ($mode != LOCK_UN && is_resource($this->lock_fp)) {
                 // XXX does not check type of lock (LOCK_SH/LOCK_EX)
                 return true;
@@ -224,11 +226,11 @@ class PEAR_Registry extends PEAR
                 }
                 $open_mode = 'r';
             }
-            
+
             @ini_set('track_errors', true);
             $this->lock_fp = @fopen($this->lockfile, $open_mode);
             @ini_restore('track_errors');
-            
+
             if (!is_resource($this->lock_fp)) {
                 return $this->raiseError("could not create lock file: $php_errormsg");
             }
@@ -421,6 +423,111 @@ class PEAR_Registry extends PEAR
     }
 
     // }}}
+
+    /**
+    Experimental dependencies database handling functions (not yet in production)
+    **/
+
+    function rebuildDepsFile()
+    {
+        $packages = $this->listPackages();
+        $files = array();
+        foreach ($packages as $package) {
+            $deps = $this->packageInfo($package, 'release_deps');
+            $this->depUpdatePackage($package, $deps);
+        }
+        // XXX Change with serialize + write
+        return $this->dependencies;
+    }
+    /*
+    The data structure is as follows:
+    $dep_db = array(
+        // Other packages depends in some manner on this packages
+        'deps' => array(
+            'Package Name' => array(
+                0 => array(
+                    // This package depends on 'Package Name'
+                    'depend' => 'Package',
+                    // Which version 'Package' needs of 'Package Name'
+                    'version' => '1.0',
+                    // The requirement (version_compare() operator)
+                    'rel' => 'ge'
+                ),
+            ),
+        )
+        // This packages are dependant on other packages
+        'pkgs' => array(
+            'Package Dependant' => array(
+                0 => array(
+                    // This is a index list with paths over the 'deps' array for quick
+                    // searching things like "what dependecies has this package?"
+                    // $dep_db['deps']['Package Name'][3]
+                    0 => 'Package Name',
+                    1 => 3 // (int)key
+                ),
+            ),
+        )
+    )
+    */
+    function _addDependency($package, $deps)
+    {
+        if (!is_array($deps) || !count($deps)) {
+            return;
+        }
+        $data = &$this->dependencies;
+        foreach ($deps as $dep) {
+            if ($dep && $dep['type'] == 'pkg' && isset($dep['name'])) {
+                settype($data['deps'][$dep['name']], 'array');
+                $data['deps'][$dep['name']][] = array('depend'  => $package,
+                                                      'version' => $dep['version'],
+                                                      'rel'     => $dep['rel']);
+                $data['pkgs'][$package][] = array($dep['name'], key($data['deps'][$dep['name']]));
+            }
+        }
+    }
+
+    function depRemovePackage($package)
+    {
+        $data = &$this->dependencies;
+        // Other packages depends on this package, can't be removed
+        if (isset($data['deps'][$package])) {
+            return $data['deps'][$package];
+        }
+        if (isset($data['pkgs'][$package])) {
+            foreach ($data['pkgs'][$package] as $remove) {
+                // remove the dependency
+                unset($data['deps'][$remove[0]][$remove[1]]);
+                // if no more dependencies, remove the subject too
+                if (!count($data['deps'][$remove[0]])) {
+                    unset($data['deps'][$remove[0]]);
+                }
+            }
+            // remove the package from the index list
+            unset($data['pkgs'][$package]);
+        }
+        return $data;
+    }
+
+    function depUpdatePackage($package, $new_version, $release_deps)
+    {
+        $data = &$this->dependencies;
+        // Other packages depend on this package, check deps
+        if (isset($data['deps'][$package])) {
+            foreach ($data['deps'][$package] as $dep) {
+                $require  = $dep['version'];
+                $relation = $dep['rel'];
+                if ($relation != 'has') {
+                    if (!version_compare($new_version, $require, $relation)) {
+                        $fails[] = $dep;
+                    }
+                }
+            }
+            if (isset($fails)) {
+                return $fails;
+            }
+        }
+        $this->_addDependency($package, $release_deps);
+    }
 }
 
 ?>
\ No newline at end of file
-- 
2.40.0