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<?php
/**
 * Benchmark 
 *
 * PHP version 4
 *
 * 2002-2006 Matthias Englert <Matthias.Englert@gmx.de>
 * 
 * This source file is subject to the New BSD license, That is bundled 
 * with this package in the file LICENSE, and is available through 
 * the world-wide-web at 
 * http://www.opensource.org/licenses/bsd-license.php 
 * If you did not receive a copy of the new BSDlicense and are unable 
 * to obtain it through the world-wide-web, please send a note to 
 * license@php.net so we can mail you a copy immediately. 
 *
 * @category Benchmarking
 * @package Benchmark
 * @author Matthias Englert <Matthias.Englert@gmx.de>
 * @copyright 2002-2006 Matthias Englert <Matthias.Englert@gmx.de>
 * @license http://www.php.net/license/3_0.txt The PHP License, Version 3.0
 * @version CVS: $Id$
 * @link http://pear.php.net/package/Benchmark
 */

require_once 'PEAR.php';

/**
 * Provides timing and profiling information.
 *
 * Example 1: Automatic profiling start, stop, and output.
 *
 * <code>
 * <?php
 * require_once 'Benchmark/Profiler.php';
 *
 * $profiler = new Benchmark_Profiler(true);
 *
 * function myFunction() {
 * global $profiler;
 * $profiler->enterSection('myFunction');
 * //do something
 * $profiler->leaveSection('myFunction');
 * return;
 * }
 *
 * //do something
 * myFunction();
 * //do more
 * ?>
 * </code>
 *
 * Example 2: Manual profiling start, stop, and output.
 *
 * <code>
 * <?php
 * require_once 'Benchmark/Profiler.php';
 *
 * $profiler = new Benchmark_Profiler();
 *
 * function myFunction() {
 * global $profiler;
 * $profiler->enterSection('myFunction');
 * //do something
 * $profiler->leaveSection('myFunction');
 * return;
 * }
 *
 * $profiler->start();
 * //do something
 * myFunction();
 * //do more
 * $profiler->stop();
 * $profiler->display();
 * ?>
 * </code>
 *
 * @category Benchmarking
 * @package Benchmark
 * @author Matthias Englert <Matthias.Englert@gmx.de>
 * @copyright 2002-2006 Matthias Englert <Matthias.Englert@gmx.de>
 * @license http://www.php.net/license/3_0.txt The PHP License, Version 3.0
 * @link http://pear.php.net/package/Benchmark
 * @since 1.2.0
 */
class Benchmark_Profiler extends PEAR
{

/**
     * Contains the total ex. time of each section
     *
     * @var    array
     * @access private
     */
    var $_sections = array();

/**
     * Calling stack
     *
     * @var    array
     * @access private
     */
    var $_stack = array();

/**
     * Notes how often a section was entered
     *
     * @var    array
     * @access private
     */
    var $_numberOfCalls = array();

/**
     * Notes for each section how much time is spend in sub-sections
     *
     * @var    array
     * @access private
     */
    var $_subSectionsTime = array();

/**
     * Notes for each section how often it calls which section
     *
     * @var    array
     * @access private
     */
    var $_calls = array();

/**
     * Notes for each section how often it was called by which section
     *
     * @var    array
     * @access private
     */
    var $_callers = array();

/**
     * Auto-starts and stops profiler
     *
     * @var    boolean
     * @access private
     */
    var $_auto = false;

/**
     * Max marker name length for non-html output
     *
     * @var    integer
     * @access private
     */
    var $_maxStringLength = 0;

/**
     * Constructor, starts profiling recording
     *
     * @param bool $auto Automatically start benchmarking
     *
     * @access public
     */
    function Benchmark_Profiler($auto = false) 
    {
        $this->_auto = $auto;

if ($this->_auto) {
            $this->start();
        }

$this->PEAR();
    }

/**
     * Close method, stop profiling recording and display output.
     *
     * @access public
     * @return void
     */
    function close() 
    {
        if (isset($this->_auto) && $this->_auto) {
            $this->stop();
            $this->display();
        }
    }

/**
     * Returns profiling informations for a given section.
     *
     * @param string $section Section to retrieve
     *
     * @return array
     * @access public
     */
    function getSectionInformations($section = 'Global') 
    {
        if (isset($this->_sections[$section])) {
            $calls = array();

if (isset($this->_calls[$section])) {
                $calls = $this->_calls[$section];
            }

$callers = array();

if (isset($this->_callers[$section])) {
                $callers = $this->_callers[$section];
            }

$informations = array();

if (isset($this->_sections['Global'])) {
                $value = $this->_sections[$section] / $this->_sections['Global'];
                $value = $value * 100;

$informations['percentage'] = number_format($value, 2, '.', '');
            } else {
                $informations['percentage'] = 'N/A';
            }

$informations['time']      = $this->_sections[$section];
            $informations['calls']     = $calls;
            $informations['num_calls'] = $this->_numberOfCalls[$section];
            $informations['callers']   = $callers;

$value = $this->_sections[$section];

if (isset($this->_subSectionsTime[$section])) {
                $value -= $this->_subSectionsTime[$section];
            }

$informations['netto_time'] = $value;

return $informations;
        } else {
            $this->raiseError("The section '$section' does not exists.\n",
                              null, PEAR_ERROR_TRIGGER, E_USER_WARNING);
        }
    }

/**
     * Returns profiling informations for all sections.
     *
     * @access public
     * @return array
     */
    function getAllSectionsInformations() 
    {
        $informations = array();

foreach ($this->_sections as $section => $time) {
            $informations[$section] = $this->getSectionInformations($section);
        }

return $informations;
    }

/**
     * Returns formatted profiling information.
     *
     * @param string $format output format (auto, plain or html), default auto
     *
     * @see    display()
     * @access private
     * @return string
     */
    function _getOutput($format) 
    {
        
        /* Quickly find out the maximun length: Ineffecient, but will do for now! */
        $informations = $this->getAllSectionsInformations();

$names = array_keys($informations);
 
 $maxLength = 0;
 foreach ($names as $name) {
 if ($maxLength < strlen($name)) {
 $maxLength = strlen($name);
 }
 }
 $this->_maxStringLength = $maxLength;

if ($format == 'auto') {
            if (function_exists('version_compare') &&
                version_compare(phpversion(), '4.1', 'ge')) {
                $format = isset($_SERVER['SERVER_PROTOCOL']) ? 'html' : 'plain';
            } else {
                global $HTTP_SERVER_VARS;
                $use_html = isset($HTTP_SERVER_VARS['SERVER_PROTOCOL']);

$format = $use_html ? 'html' : 'plain';
            }
        }

if ($format == 'html') {
 $out = '<table style="border: 1px solid #000000; ">'."\n";
 $out .=
 '<tr><td> </td><td align="center">total ex. time</td>'.
 '<td align="center">netto ex. time</td>'.
 '<td align="center">#calls</td>'.
 '<td align="center">%</td>'.
 '<td align="center">calls</td>' .
 '<td align="center">callers</td></tr>'.
 "\n";
 } else {
 $dashes = str_pad("\n", ($this->_maxStringLength + 75), '-',
 STR_PAD_LEFT);

$out  = $dashes;
            $out .= str_pad('Section', $this->_maxStringLength + 10);
            $out .= str_pad("Total Ex Time", 22);
            $out .= str_pad("Netto Ex Time", 22);
            $out .= str_pad("#Calls", 10);
            $out .= "Percentage\n";
            $out .= $dashes;
        }
           
        foreach ($informations as $name => $values) {
            $percentage = $values['percentage'];
            $calls_str  = "";

foreach ($values['calls'] as $key => $val) {
                if ($calls_str) {
                    $calls_str .= ", ";
                }

$calls_str .= "$key ($val)";
            }

$callers_str = "";

foreach ($values['callers'] as $key => $val) {
                if ($callers_str) {
                    $callers_str .= ", ";
                }

$callers_str .= "$key ($val)";
            }

$percentage = $values['percentage'];
            if (is_numeric($values['percentage'])) {
                $percentage .= '%';
            }

if ($format == 'html') {
 $out .= "<tr>";
 $out .= "<td>$name</td>";
 $out .= "<td>{$values['time']}</td>";
 $out .= "<td>{$values['netto_time']}</td>";
 $out .= "<td>{$values['num_calls']}</td>";
 $out .= "<td>{$percentage}</td>";

$out .= "<td>$calls_str</td><td>$callers_str</td></tr>";
 } else {
 $out .= str_pad($name, $this->_maxStringLength + 10);
 $out .= str_pad($values['time'], 22);
 $out .= str_pad($values['netto_time'], 22);
 $out .= str_pad($values['num_calls'], 10); 
 $out .= str_pad($percentage . "\n", 8, ' ', STR_PAD_LEFT);
 }
 }
 
 if ($format == 'html') {
 return $out . '</table>';
 } else {
 return $out;
 }
 }

/**
     * Returns formatted profiling information.
     *
     * @param string $format output format (auto, plain or html), default auto
     *
     * @access public
     * @return void
     */
    function display($format = 'auto') 
    {
        echo $this->_getOutput($format);
    }

/**
     * Enters "Global" section.
     *
     * @see    enterSection(), stop()
     * @access public
     * @return void
     */
    function start() 
    {
        $this->enterSection('Global');
    }

/**
     * Leaves "Global" section.
     *
     * @see    leaveSection(), start()
     * @access public
     * @return void
     */
    function stop() 
    {
        $this->leaveSection('Global');
    }

/**
     * Enters code section.
     *
     * @param string $name The code section
     *
     * @see    start(), leaveSection()
     * @access public
     * @return void
     */
    function enterSection($name) 
    {
        if (count($this->_stack)) {
            $item = end($this->_stack);

if (isset($this->_callers[$name][$item["name"]])) {
                $this->_callers[$name][$item["name"]]++;
            } else {
                $this->_callers[$name][$item["name"]] = 1;
            }

if (isset($this->_calls[$item][$name])) {
                $this->_calls[$item["name"]][$name]++;
            } else {
                $this->_calls[$item["name"]][$name] = 1;
            }
        } else {
            if ($name != 'Global') {
                $msg = "tried to enter section " . $name 
                     . " but profiling was not started\n";

$this->raiseError($msg, null, PEAR_ERROR_DIE);
            }
        }

if (isset($this->_numberOfCalls[$name])) {
            $this->_numberOfCalls[$name]++;
        } else {
            $this->_numberOfCalls[$name] = 1;
        }

$data = array("name" => $name, "time" => $this->_getMicrotime());
        array_push($this->_stack, $data);
    }

/**
     * Leaves code section.
     *
     * @param string $name The marker to be set
     *
     * @see    stop(), enterSection()
     * @access public
     * @return void
     */
    function leaveSection($name) 
    {
        $microtime = $this->_getMicrotime();

if (!count($this->_stack)) {
            $msg = "tried to leave section " . $name 
                 . " but profiling was not started\n";

$this->raiseError($msg, null, PEAR_ERROR_DIE);
        }

$x = array_pop($this->_stack);

if ($x["name"] != $name) {
            $msg = "reached end of section " . $name 
                 . " but expecting end of " . $x["name"] . "\n";

$this->raiseError($msg, null, PEAR_ERROR_DIE);
        }

if (isset($this->_sections[$name])) {
            $this->_sections[$name] += $microtime - $x["time"];
        } else {
            $this->_sections[$name] = $microtime - $x["time"];
        }

$parent = array_pop($this->_stack);

if (isset($parent)) {
            if (isset($this->_subSectionsTime[$parent['name']])) {
                $this->_subSectionsTime[$parent['name']] += $microtime - $x['time'];
            } else {
                $this->_subSectionsTime[$parent['name']] = $microtime - $x['time'];
            }

array_push($this->_stack, $parent);
        }
    }

/**
     * Wrapper for microtime().
     *
     * @return float
     * @access private
     * @since  1.3.0
     */
    function _getMicrotime() 
    {
        $microtime = explode(' ', microtime());
        return $microtime[1] . substr($microtime[0], 1);
    }
}