dependency2.php

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                }
                if ($fail) {
                    // start over, we removed some children
                    continue 2;
                }
            }
        } while ($fail);
        // next, construct the list of packages that can't be uninstalled
        $badpackages = array();
        $save = $this->_currentPackage;
        foreach ($perpackagelist as $package => $packagedeps) {
            foreach ($packagedeps as $parent) {
                if (!isset($remove[$parent[0]])) {
                    continue;
                }
                $packagename = $this->_registry->parsePackageName($parent[0]);
                $packagename['channel'] = $this->_registry->channelAlias($packagename['channel']);
                $pa = $this->_registry->getPackage($packagename['package'], $packagename['channel']);
                $packagename['package'] = $pa->getPackage();
                $this->_currentPackage = $packagename;
                // parent is not present in uninstall list, make sure we can actually
                // uninstall it (parent dep is optional)
                $parentname['channel'] = $this->_registry->channelAlias($parent[1]['dep']['channel']);
                $pa = $this->_registry->getPackage($parent[1]['dep']['name'], $parent[1]['dep']['channel']);
                $parentname['package'] = $pa->getPackage();
                $parent[1]['dep']['package'] = $parentname['package'];
                $parent[1]['dep']['channel'] = $parentname['channel'];
                if ($parent[1]['type'] == 'optional') {
                    $test = $this->_validatePackageUninstall($parent[1]['dep'], false, $dl);
                    if ($test !== true) {
                        $badpackages[$package]['warnings'][] = $test;
                    }
                } else {
                    $test = $this->_validatePackageUninstall($parent[1]['dep'], true, $dl);
                    if ($test !== true) {
                        $badpackages[$package]['errors'][] = $test;
                    }
                }
            }
        }
        $this->_currentPackage = $save;
        $dl->___uninstall_package_cache = $badpackages;
        if (isset($badpackages[$memyselfandI])) {
            if (isset($badpackages[$memyselfandI]['warnings'])) {
                foreach ($badpackages[$memyselfandI]['warnings'] as $warning) {
                    $dl->log(0, $warning[0]);
                }
            }
            if (isset($badpackages[$memyselfandI]['errors'])) {
                foreach ($badpackages[$memyselfandI]['errors'] as $error) {
                    if (is_array($error)) {
                        $dl->log(0, $error[0]);
                    } else {
                        $dl->log(0, $error->getMessage());
                    }
                }
                if (isset($this->_options['nodeps']) || isset($this->_options['force'])) {
                    return $this->warning(
                        'warning: %s should not be uninstalled, other installed packages depend ' .
                        'on this package');
                } else {
                    return $this->raiseError(
                        '%s cannot be uninstalled, other installed packages depend on this package');
                }
            }
        }
        return true;
    }

    function _validatePackageUninstall($dep, $required, $dl)
    {
        $depname = $this->_registry->parsedPackageNameToString($dep, true);
        $version = $this->_registry->packageinfo($dep['package'], 'version',
            $dep['channel']);
        if (!$version) {
            return true;
        }
        $extra = $this->_getExtraString($dep);
        if (isset($dep['exclude'])) {
            if (!is_array($dep['exclude'])) {
                $dep['exclude'] = array($dep['exclude']);
            }
        }
        if (isset($dep['conflicts'])) {
            return true; // uninstall OK - these packages conflict (probably installed with --force)
        }
        if (!isset($dep['min']) && !isset($dep['max'])) {
            if ($required) {
                if (!isset($this->_options['nodeps']) && !isset($this->_options['force'])) {
                    return $this->raiseError('"' . $depname . '" is required by ' .
                        'installed package %s' . $extra);
                } else {
                    return $this->warning('warning: "' . $depname . '" is required by ' .
                        'installed package %s' . $extra);
                }
            } else {
                return $this->warning('"' . $depname . '" can be optionally used by ' .
                        'installed package %s' . $extra);
            }
        }
        $fail = false;
        if (isset($dep['min'])) {
            if (version_compare($version, $dep['min'], '>=')) {
                $fail = true;
            }
        }
        if (isset($dep['max'])) {
            if (version_compare($version, $dep['max'], '<=')) {
                $fail = true;
            }
        }
        // we re-use this variable, preserve the original value
        $saverequired = $required;
        if ($required) {
            if (!isset($this->_options['nodeps']) && !isset($this->_options['force'])) {
                return $this->raiseError($depname . $extra . ' is required by installed package' .
                    ' "%s"');
            } else {
                return $this->raiseError('warning: ' . $depname . $extra .
                    ' is required by installed package "%s"');
            }
        } else {
            return $this->warning($depname . $extra . ' can be optionally used by installed package' .
                    ' "%s"');
        }
        return true;
    }

    /**
     * validate a downloaded package against installed packages
     * 
     * As of PEAR 1.4.3, this will only validate
     *
     * @param array|PEAR_Downloader_Package|PEAR_PackageFile_v1|PEAR_PackageFile_v2
     *              $pkg package identifier (either
     *                   array('package' => blah, 'channel' => blah) or an array with
     *                   index 'info' referencing an object)
     * @param PEAR_Downloader $dl
     * @param array $params full list of packages to install
     * @return true|PEAR_Error
     */
    function validatePackage($pkg, &$dl, $params = array())
    {
        if (is_array($pkg) && isset($pkg['info'])) {
            $deps = $this->_dependencydb->getDependentPackageDependencies($pkg['info']);
        } else {
            $deps = $this->_dependencydb->getDependentPackageDependencies($pkg);
        }
        $fail = false;
        if ($deps) {
            if (!class_exists('PEAR_Downloader_Package')) {
                require_once 'PEAR/Downloader/Package.php';
            }
            $dp = &new PEAR_Downloader_Package($dl);
            if (is_object($pkg)) {
                $dp->setPackageFile($pkg);
            } else {
                $dp->setDownloadURL($pkg);
            }
            PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
            foreach ($deps as $channel => $info) {
                foreach ($info as $package => $ds) {
                    foreach ($params as $packd) {
                        if (strtolower($packd->getPackage()) == strtolower($package) &&
                              $packd->getChannel() == $channel) {
                            $dl->log(3, 'skipping installed package check of "' .
                                        $this->_registry->parsedPackageNameToString(
                                            array('channel' => $channel, 'package' => $package),
                                            true) .
                                        '", version "' . $packd->getVersion() . '" will be ' .
                                        'downloaded and installed');
                            continue 2; // jump to next package
                        }
                    }
                    foreach ($ds as $d) {
                        $checker = &new PEAR_Dependency2($this->_config, $this->_options,
                            array('channel' => $channel, 'package' => $package), $this->_state);
                        $dep = $d['dep'];
                        $required = $d['type'] == 'required';
                        $ret = $checker->_validatePackageDownload($dep, $required, array(&$dp));
                        if (is_array($ret)) {
                            $dl->log(0, $ret[0]);
                        } elseif (PEAR::isError($ret)) {
                            $dl->log(0, $ret->getMessage());
                            $fail = true;
                        }
                    }
                }
            }
            PEAR::popErrorHandling();
        }
        if ($fail) {
            return $this->raiseError(
                '%s cannot be installed, conflicts with installed packages');
        }
        return true;
    }

    /**
     * validate a package.xml 1.0 dependency
     */
    function validateDependency1($dep, $params = array())
    {
        if (!isset($dep['optional'])) {
            $dep['optional'] = 'no';
        }
        list($newdep, $type) = $this->normalizeDep($dep);
        if (!$newdep) {
            return $this->raiseError("Invalid Dependency");
        }
        if (method_exists($this, "validate{$type}Dependency")) {
            return $this->{"validate{$type}Dependency"}($newdep, $dep['optional'] == 'no',
                $params, true);
        }
    }

    /**
     * Convert a 1.0 dep into a 2.0 dep
     */
    function normalizeDep($dep)
    {
        $types = array(
            'pkg' => 'Package',
            'ext' => 'Extension',
            'os' => 'Os',
            'php' => 'Php'
        );
        if (isset($types[$dep['type']])) {
            $type = $types[$dep['type']];
        } else {
            return array(false, false);
        }
        $newdep = array();
        switch ($type) {
            case 'Package' :
                $newdep['channel'] = 'pear.php.net';
            case 'Extension' :
            case 'Os' :
                $newdep['name'] = $dep['name'];
            break;
        }
        $dep['rel'] = PEAR_Dependency2::signOperator($dep['rel']);
        switch ($dep['rel']) {
            case 'has' :
                return array($newdep, $type);
            break;
            case 'not' :
                $newdep['conflicts'] = true;
            break;
            case '>=' :
            case '>' :
                $newdep['min'] = $dep['version'];
                if ($dep['rel'] == '>') {
                    $newdep['exclude'] = $dep['version'];
                }
            break;
            case '<=' :
            case '<' :
                $newdep['max'] = $dep['version'];
                if ($dep['rel'] == '<') {
                    $newdep['exclude'] = $dep['version'];
                }
            break;
            case 'ne' :
            case '!=' :
                $newdep['min'] = '0';
                $newdep['max'] = '100000';
                $newdep['exclude'] = $dep['version'];
            break;
            case '==' :
                $newdep['min'] = $dep['version'];
                $newdep['max'] = $dep['version'];
            break;
        }
        if ($type == 'Php') {
            if (!isset($newdep['min'])) {
                $newdep['min'] = '4.2.0';
            }
            if (!isset($newdep['max'])) {
                $newdep['max'] = '6.0.0';
            }
        }
        return array($newdep, $type);
    }

    /**
     * Converts text comparing operators to them sign equivalents
     *
     * Example: 'ge' to '>='
     *
     * @access public
     * @param  string Operator
     * @return string Sign equivalent
     */
    function signOperator($operator)
    {
        switch($operator) {
            case 'lt': return '<';
            case 'le': return '<=';
            case 'gt': return '>';
            case 'ge': return '>=';
            case 'eq': return '==';
            case 'ne': return '!=';
            default:
                return $operator;
        }
    }

    function raiseError($msg)
    {
        if (isset($this->_options['ignore-errors'])) {
            return $this->warning($msg);
        }
        return PEAR::raiseError(sprintf($msg, $this->_registry->parsedPackageNameToString(
            $this->_currentPackage, true)));
    }

    function warning($msg)
    {
        return array(sprintf($msg, $this->_registry->parsedPackageNameToString(
            $this->_currentPackage, true)));
    }
}
?>