<?php
	// group-market-shares.php
	// Ilari Scheinin <firstname.lastname@helsinki>
	// MIT License
	
	// This script pulls operating system market share data from Net Applications,
	// groups it according to the groups defined in $grouping,
	// and writes the results to a file named market-shares.txt.
	
	$months = array(
		'January' =>	'01',
		'February' =>	'02',
		'March' =>		'03',
		'April' =>		'04',
		'May' =>		'05',
		'June' =>		'06',
		'July' =>		'07',
		'August' =>		'08',
		'September' =>	'09',
		'October' =>	'10',
		'November' =>	'11',
		'December' =>	'12');
	
	$grouping = array(
		'Windows' =>		array('Win64', 'Windows 2000', 'Windows 7',
							'Windows 95', 'Windows 98', 'Windows ME',
							'Windows NT', 'Windows Vista',
							'Windows XP 64-bit Edition', 'Windows XP'),
		'Mac' =>			array('Mac OS X (no version reported)',
							'Mac OS X 10.4', 'Mac OS X 10.5', 'Mac OS X 10.6',
							'Mac OS X Mach-O', 'Mac OS', 'MacIntel', 'MacOS'),
		'Linux' =>			array('Linux'),
		'Other device' =>	array('FreeBSD', 'Nintendo Wii', 'PLAYSTATION 3',
							'Pike', 'SunOS', 'Unknown', 'X11'), 
		'iPhone/iPod' =>	array('iPhone', 'iPod'),
		'Java' =>			array('Java ME'),
		'Symbian' =>		array('Series60', 'Symbian'),
		'Windows Mobile' =>	array('Windows CE', 'Windows Mobile'),
		'Android' =>		array('Android 1.0', 'Android 1.1',
							'Android 1.5', 'Android 1.6', 'Android 2.0'),
		'BlackBerry' =>		array('BlackBerry'),
		'Palm' =>			array('PalmOS', 'webOS'),
		'Other handheld' => array('Hiptop', 'KDDI', 'PSP', 'FOMA'));
	
	$os_groups = array_keys($grouping);
	$os_list = array();
	foreach($os_groups as $os)
		foreach($grouping[$os] as $entry)
			$os_list[$entry] = $os;
	
	echo 'Downloading and grouping market share data...';
	$last = '';
	for ($i=108; $i<144; $i++) { // from January 2008 to December 2010
		$string = file_get_contents('http://marketshare.hitslink.com' .
			'/report.aspx?qprid=10&qptimeframe=M&qpsp=' . $i .
			 '&qpmr=30&qpdt=1&qpct=3&qpf=13');
		if ($string == $last) break;
		$last = $string;
		$string = substr($string, strpos($string, '<?xml'));
		$xml = new DOMDocument('1.0', 'UTF-8');
		$xml->loadXML($string);
		$date = explode(', ',
			$xml->getElementsByTagName('timeframe')->item(0)->nodeValue);
		$month = $date[1] . '-' . $months[$date[0]];
		$rows = $xml->getElementsByTagName('row');
		if ($rows->length == 0) break;
		for ($j=0; $j<$rows->length; $j++) {
			$os = $rows->item($j)->getElementsByTagName(
				'value1')->item(0)->nodeValue;
			$share = trim($rows->item($j)->getElementsByTagName(
				'value2')->item(0)->nodeValue, '%');
			if ($share == 0)
				continue;
			if (!isset($os_list[$os]))
				exit("Unknown operating system: $os\n");
			if (isset($ms[$month][$os_list[$os]]))
				$ms[$month][$os_list[$os]] += $share;
			else
				$ms[$month][$os_list[$os]] = $share;
		}
	}
	$fp = fopen('market-shares.txt', 'w');
	fwrite($fp, "Month\t" . implode("\t", $os_groups) . "\n");
	foreach ($ms as $month => $values) {
		fwrite($fp, $month);
		foreach ($os_groups as $os)
			if (isset($values[$os]))
				fwrite($fp, "\t" . sprintf("%.2f", $values[$os]));
			else
				fwrite($fp, "\t0.00");
		fwrite($fp, "\n");
	}
	fclose($fp);
	echo "\nDone.\n";
?>