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<?php
/**
* Class for reading datafiles generated by Webgrind_Preprocessor
*
* @package Webgrind
* @author Jacob Oettinger
**/
class Webgrind_Reader
{
/**
* File format version that this reader understands
*/
const FILE_FORMAT_VERSION = 6;
/**
* Binary number format used.
* @see http://dk2.php.net/pack
*/
const NR_FORMAT = 'V';
/**
* Size, in bytes, of the above number format
*/
const NR_SIZE = 4;
/**
* Length of a call information block
*/
const CALLINFORMATION_LENGTH = 4;
/**
* Address of the headers in the data file
*
* @var int
*/
private $headersPos;
/**
* Array of addresses pointing to information about functions
*
* @var array
*/
private $functionPos;
/**
* Array of headers
*
* @var array
*/
private $headers=null;
/**
* Constructor
* @param string Data file to read
**/
function __construct($dataFile){
$this->fp = @fopen($dataFile,'rb');
if(!$this->fp)
throw new Exception('Error opening file!');
$this->init();
}
/**
* Initializes the parser by reading initial information.
*
* Throws an exception if the file version does not match the readers version
*
* @return void
* @throws Exception
*/
private function init(){
list($version, $this->headersPos, $functionCount) = $this->read(3);
if($version!=self::FILE_FORMAT_VERSION)
throw new Exception('Datafile not correct version. Found '.$version.' expected '.self::FILE_FORMAT_VERSION);
$this->functionPos = $this->read($functionCount);
}
/**
* Returns number of functions
* @return int
*/
function getFunctionCount(){
return count($this->functionPos);
}
/**
* Returns information about function with nr $nr
*
* @param $nr int Function number
* @param $costFormat Format to return costs in. 'absolute' (default) or 'percentual'
* @return array Function information
*/
function getFunctionInfo($nr, $costFormat = 'absolute'){
$this->seek($this->functionPos[$nr]);
list($summedSelfCost, $summedInclusiveCost, $invocationCount, $calledFromCount, $subCallCount) = $this->read(5);
$this->seek(self::NR_SIZE*self::CALLINFORMATION_LENGTH*($calledFromCount+$subCallCount), SEEK_CUR);
$file = $this->readLine();
$function = $this->readLine();
$result = array(
'file'=>$file,
'functionName'=>$function,
'summedSelfCost'=>$summedSelfCost,
'summedInclusiveCost'=>$summedInclusiveCost,
'invocationCount'=>$invocationCount,
'calledFromInfoCount'=>$calledFromCount,
'subCallInfoCount'=>$subCallCount
);
if ($costFormat == 'percentual') {
$result['summedSelfCost'] = $this->percentCost($result['summedSelfCost']);
$result['summedInclusiveCost'] = $this->percentCost($result['summedInclusiveCost']);
}
return $result;
}
/**
* Returns information about positions where a function has been called from
*
* @param $functionNr int Function number
* @param $calledFromNr int Called from position nr
* @param $costFormat Format to return costs in. 'absolute' (default) or 'percentual'
* @return array Called from information
*/
function getCalledFromInfo($functionNr, $calledFromNr, $costFormat = 'absolute'){
// 5 = number of numbers before called from information
$this->seek($this->functionPos[$functionNr]+self::NR_SIZE*(self::CALLINFORMATION_LENGTH*$calledFromNr+5));
$data = $this->read(self::CALLINFORMATION_LENGTH);
$result = array(
'functionNr'=>$data[0],
'line'=>$data[1],
'callCount'=>$data[2],
'summedCallCost'=>$data[3]
);
if ($costFormat == 'percentual') {
$result['summedCallCost'] = $this->percentCost($result['summedCallCost']);
}
return $result;
}
/**
* Returns information about functions called by a function
*
* @param $functionNr int Function number
* @param $subCallNr int Sub call position nr
* @param $costFormat Format to return costs in. 'absolute' (default) or 'percentual'
* @return array Sub call information
*/
function getSubCallInfo($functionNr, $subCallNr, $costFormat = 'absolute'){
// 4 = number of numbers before sub call count
$this->seek($this->functionPos[$functionNr]+self::NR_SIZE*3);
$calledFromInfoCount = $this->read();
$this->seek( ( ($calledFromInfoCount+$subCallNr) * self::CALLINFORMATION_LENGTH + 1 ) * self::NR_SIZE,SEEK_CUR);
$data = $this->read(self::CALLINFORMATION_LENGTH);
$result = array(
'functionNr'=>$data[0],
'line'=>$data[1],
'callCount'=>$data[2],
'summedCallCost'=>$data[3]
);
if ($costFormat == 'percentual') {
$result['summedCallCost'] = $this->percentCost($result['summedCallCost']);
}
return $result;
}
/**
* Returns array of defined headers
*
* @return array Headers in format array('header name'=>'header value')
*/
function getHeaders(){
if($this->headers==null){ // Cache headers
$this->seek($this->headersPos);
while($line=$this->readLine()){
$parts = explode(': ',$line);
$this->headers[$parts[0]] = $parts[1];
}
}
return $this->headers;
}
/**
* Returns value of a single header
*
* @return string Header value
*/
function getHeader($header){
$headers = $this->getHeaders();
return $headers[$header];
}
/**
* Formats $cost as a percent value of the summary header
*
* @param int $cost Cost
* @return int Cost in percent
*/
function percentCost($cost){
$total = $this->getHeader('summary');
$result = ($total==0) ? 0 : ($cost*100)/$total;
return number_format($result, 3, '.', '');
}
private function read($numbers=1){
$values = unpack(self::NR_FORMAT.$numbers,fread($this->fp,self::NR_SIZE*$numbers));
if($numbers==1)
return $values[1];
else
return array_values($values); // reindex and return
}
private function readLine(){
$result = fgets($this->fp);
if($result)
return trim($result);
else
return $result;
}
private function seek($offset, $whence=SEEK_SET){
return fseek($this->fp, $offset, $whence);
}
}
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