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Filename : Replace.php
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<?php
/**
 * <tasks:replace>
 *
 * PHP versions 4 and 5
 *
 * @category  pear
 * @package   PEAR
 * @author    Greg Beaver <cellog@php.net>
 * @copyright 1997-2009 The Authors
 * @license   http://opensource.org/licenses/bsd-license.php New BSD License
 * @link      http://pear.php.net/package/PEAR
 * @since     File available since Release 1.4.0a1
 */
/**
 * Base class
 */
require_once 'PEAR/Task/Common.php';
/**
 * Implements the replace file task.
 * @category   pear
 * @package    PEAR
 * @author     Greg Beaver <cellog@php.net>
 * @copyright  1997-2009 The Authors
 * @license    http://opensource.org/licenses/bsd-license.php New BSD License
 * @version    Release: 1.10.12
 * @link       http://pear.php.net/package/PEAR
 * @since      Class available since Release 1.4.0a1
 */
class PEAR_Task_Replace extends PEAR_Task_Common
{
    public $type = 'simple';
    public $phase = PEAR_TASK_PACKAGEANDINSTALL;
    public $_replacements;

    /**
     * Validate the raw xml at parsing-time.
     *
     * @param  PEAR_PackageFile_v2
     * @param  array raw, parsed xml
     * @param  PEAR_Config
     */
    public static function validateXml($pkg, $xml, $config, $fileXml)
    {
        if (!isset($xml['attribs'])) {
            return array(PEAR_TASK_ERROR_NOATTRIBS);
        }
        if (!isset($xml['attribs']['type'])) {
            return array(PEAR_TASK_ERROR_MISSING_ATTRIB, 'type');
        }
        if (!isset($xml['attribs']['to'])) {
            return array(PEAR_TASK_ERROR_MISSING_ATTRIB, 'to');
        }
        if (!isset($xml['attribs']['from'])) {
            return array(PEAR_TASK_ERROR_MISSING_ATTRIB, 'from');
        }
        if ($xml['attribs']['type'] == 'pear-config') {
            if (!in_array($xml['attribs']['to'], $config->getKeys())) {
                return array(PEAR_TASK_ERROR_WRONG_ATTRIB_VALUE, 'to', $xml['attribs']['to'],
                    $config->getKeys(), );
            }
        } elseif ($xml['attribs']['type'] == 'php-const') {
            if (defined($xml['attribs']['to'])) {
                return true;
            } else {
                return array(PEAR_TASK_ERROR_WRONG_ATTRIB_VALUE, 'to', $xml['attribs']['to'],
                    array('valid PHP constant'), );
            }
        } elseif ($xml['attribs']['type'] == 'package-info') {
            if (in_array(
                $xml['attribs']['to'],
                array('name', 'summary', 'channel', 'notes', 'extends', 'description',
                    'release_notes', 'license', 'release-license', 'license-uri',
                    'version', 'api-version', 'state', 'api-state', 'release_date',
                    'date', 'time', )
            )) {
                return true;
            } else {
                return array(PEAR_TASK_ERROR_WRONG_ATTRIB_VALUE, 'to', $xml['attribs']['to'],
                    array('name', 'summary', 'channel', 'notes', 'extends', 'description',
                    'release_notes', 'license', 'release-license', 'license-uri',
                    'version', 'api-version', 'state', 'api-state', 'release_date',
                    'date', 'time', ), );
            }
        } else {
            return array(PEAR_TASK_ERROR_WRONG_ATTRIB_VALUE, 'type', $xml['attribs']['type'],
                array('pear-config', 'package-info', 'php-const'), );
        }

        return true;
    }

    /**
     * Initialize a task instance with the parameters
     * @param array raw, parsed xml
     * @param unused
     * @param unused
     */
    public function init($xml, $attribs, $lastVersion = null)
    {
        $this->_replacements = isset($xml['attribs']) ? array($xml) : $xml;
    }

    /**
     * Do a package.xml 1.0 replacement, with additional package-info fields available
     *
     * See validateXml() source for the complete list of allowed fields
     *
     * @param  PEAR_PackageFile_v1|PEAR_PackageFile_v2
     * @param  string file contents
     * @param  string the eventual final file location (informational only)
     * @return string|false|PEAR_Error false to skip this file, PEAR_Error to fail
     *                                 (use $this->throwError), otherwise return the new contents
     */
    public function startSession($pkg, $contents, $dest)
    {
        $subst_from = $subst_to = array();
        foreach ($this->_replacements as $a) {
            $a = $a['attribs'];
            $to = '';
            if ($a['type'] == 'pear-config') {
                if ($this->installphase == PEAR_TASK_PACKAGE) {
                    return false;
                }
                if ($a['to'] == 'master_server') {
                    $chan = $this->registry->getChannel($pkg->getChannel());
                    if (!PEAR::isError($chan)) {
                        $to = $chan->getServer();
                    } else {
                        $this->logger->log(0, "$dest: invalid pear-config replacement: $a[to]");

                        return false;
                    }
                } else {
                    if ($this->config->isDefinedLayer('ftp')) {
                        // try the remote config file first
                        $to = $this->config->get($a['to'], 'ftp', $pkg->getChannel());
                        if (is_null($to)) {
                            // then default to local
                            $to = $this->config->get($a['to'], null, $pkg->getChannel());
                        }
                    } else {
                        $to = $this->config->get($a['to'], null, $pkg->getChannel());
                    }
                }
                if (is_null($to)) {
                    $this->logger->log(0, "$dest: invalid pear-config replacement: $a[to]");

                    return false;
                }
            } elseif ($a['type'] == 'php-const') {
                if ($this->installphase == PEAR_TASK_PACKAGE) {
                    return false;
                }
                if (defined($a['to'])) {
                    $to = constant($a['to']);
                } else {
                    $this->logger->log(0, "$dest: invalid php-const replacement: $a[to]");

                    return false;
                }
            } else {
                if ($t = $pkg->packageInfo($a['to'])) {
                    $to = $t;
                } else {
                    $this->logger->log(0, "$dest: invalid package-info replacement: $a[to]");

                    return false;
                }
            }
            if (!is_null($to)) {
                $subst_from[] = $a['from'];
                $subst_to[] = $to;
            }
        }
        $this->logger->log(
            3, "doing ".sizeof($subst_from).
            " substitution(s) for $dest"
        );
        if (sizeof($subst_from)) {
            $contents = str_replace($subst_from, $subst_to, $contents);
        }

        return $contents;
    }
}