<?php
/*
**  $Id$
**
**	Copyright (C) 1995-2007 by the ITools Authors.
**	This file is part of ITools - the Internet Tools Library
**
**	ITools is free software; you can redistribute it and/or modify
**	it under the terms of the GNU General Public License as published by
**	the Free Software Foundation; either version 3 of the License, or
**	(at your option) any later version.
**
**	ITools is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**	GNU General Public License for more details.
**
**	You should have received a copy of the GNU General Public License
**	along with this program.  If not, see <http://www.gnu.org/licenses/>.
**
**	Inspired by browser.pinc,v 1.1.1.1 1999/03/23 14:51:39 bobak Exp
*/

/**
 * Browser capabilities class
 * var $Type		string: Browser type, "Netscape", "MSIE", "Konqueror", "Opera", "Safari", "Gecko" etc.
 * var $Version		float:  Browser-Version x.y for all brands
 * var $Platform	string: "Win95", "Macintosh", "Linux" ... may be wrong
 * var $Language	string: Browser's language, "de", "en", ... or unset
 * var $HTMLVersion	float:  Suported HTML version x.y
 * var $JavaScript	bool:   Browser supports Javascript
 * var $CSS		bool:   Browser supports Style sheets
 * var $TextOnly	bool:   Browser supports only text, no graphics
 */
class it_browser
{
	/* Generic attributes */
	var $UserAgent;		/* string: Unparsed HTTP_USER_AGENT */
	var $Type = '';		/* string: Browser type, "Netscape", "MSIE", etc. */
	var $Version;		/* float:  Browser-Version x.y for all brands */
	var $Platform;		/* string: "Win95", "Macintosh", "Linux" ... may be wrong */
	var $Language;		/* string: Browser's language, "de", "en", ... or unset */
	var $HTMLVersion=0;	/* float:  Suported HTML version x.y */
	var $JavaScript=0;	/* bool:   Browser supports Javascript */
	var $CSS=1;			/* int:    Style sheet level (0..3) */
	var $CSSFilter=0;	/* bool:   Is MSIE and supports CSS filter: property */
	var $TextOnly=0;	/* bool:   Browser supports only text, no graphics */
	var $VML=0;			/* bool:   Browser support VectorMarkupLanguage */
	var $Canvas=0;		/* bool:   Supports Canvas */
	var $XMLHTTP=0;		/* bool:   Browser supports XMLHTTP requests */

	/* Browser specific stuff (DEPRECATED, use generic attributes above) */
	var $MSIE;		/* float:  Microsoft Internet Explorer Version or 0 */
	var $NS;		/* float:  Netscape Navigator Version or 0 */

/**
 * Constructor: Initializes public fields with browser capabilities
 */
function it_browser()
{
	$this->UserAgent = $_SERVER['HTTP_USER_AGENT'];
	/* $this->UserAgent = "Mozilla/4.0 [de] (compatible; MSIE 5.0; Windows 95; .NET CRL 2.0.154)"; */

	/* Find "Mozilla/4.0" */
	if (preg_match("#([^/]*)/([^ ]*)#", $this->UserAgent, $regs))
	{
		$this->Type = $regs[1];
		$this->Version = (double)$regs[2];
	}

	/* Find optional "(compatible; MSIE 3.0; Win95)" */
	if (preg_match("/\((.+)\)/U", $this->UserAgent, $regs))
	{
		$optattr = preg_split("/;\s+/", $regs[1]);
		if ($optattr[0] == "compatible")
		{
			if (preg_match("#([^/]*)[/ ]([^/]*)#", $optattr[1], $regs))
			{
				$this->Type = $regs[1];
				$this->Version = (double)$regs[2];
			}
			else
				$this->Type = $optattr[1];

			$this->Platform = !empty($optattr[2]) ? $optattr[2] : $optattr[count($optattr)-1];
		}
		else
			$this->Platform = $optattr[0];

		for ($i=1; $i < count($optattr); $i++)
		{
			if (preg_match("/^([a-z]{2})(\-[a-z]{2})?$/i", $optattr[$i], $regs))
				$this->Language = $regs[1];
			if (preg_match("/^rv:([0-9\.]+)/", $optattr[$i], $regs))
				$this->Version = (float)$regs[1];
			if (strstr($optattr[$i], "Linux") || $optattr[$i] == "X11")
				$this->Platform = "Linux";
		}
	}

	/* Find optional "[de]" */
	if (!$this->Language && preg_match("/\[(.*)\]/", $this->UserAgent, $regs))
		$this->Language = $regs[1];

	/* Check for Safari/KHTML */
	if (preg_match("/(Safari|AppleWebKit)\/([0-9\.]+)/", $this->UserAgent, $regs))
	{
		$this->Type = "Safari";
		$this->Version = floatval($regs[2]);
	}

	/* Check for Gecko based browser */
	if ($this->Type == "Mozilla" && preg_match("/[^a-z]Gecko[^a-z]/", $this->UserAgent))
		$this->Type = "Gecko";
	else if ($this->Type == "Mozilla" && $this->Version < 5)
		$this->Type = "Netscape";

	/* Read language from Accept-Language header */
	if (!$this->Language && $_SERVER['HTTP_ACCEPT_LANGUAGE'])
	{
		$accept_langs = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);
		$this->Language = substr($accept_langs[0], 0, 2);
	}

	/* And now for the browser capabilities ... */
	if ($this->Type == "MSIE")
	{
		$this->MSIE = $this->Version;
		$this->HTMLVersion = 4.0;
		$this->JavaScript  = true;
		$this->VML = ($this->Version >= 5.5);
		$this->XMLHTTP = ($this->Version >= 5);
		$this->CSS = $this->Version >= 4.0 ? 2 : 1;
		$this->CSSFilter = ($this->Version >= 5.0);
	}
	else if ($this->Type == "Opera")
	{
		$this->Opera = $this->Version;
		if ($this->Version >= 3.5)
		{
			$this->HTMLVersion = 4.0;
			$this->CSS = 2;
		}
		else
		{
			$this->HTMLVersion = 3.2;
			$this->CSS = 1;
		}
		$this->JavaScript = true;
		$this->XMLHTTP = ($this->Version >= 8);
	}
	else if ($this->Type == "Konqueror")
	{
		$this->HTMLVersion = 4.0;
		$this->CSS = 2;
		$this->JavaScript = true;
		$this->XMLHTTP = ($this->Version >= 3);
	}
	else if ($this->Type == "Netscape")
	{
		$this->NS = $this->Version;
		$this->HTMLVersion = 4.0;
		$this->JavaScript = true;

		if ($this->Version >= 5.0)
			$this->CSS = 2;
	}
	else if ($this->Type == "Gecko")
	{
		$this->HTMLVersion = 4.0;
		$this->CSS = 2;
		$this->JavaScript = true;
		$this->XMLHTTP = true;
		$this->Canvas = ($this->Version >= 1.8);
	}
	else if ($this->Type == "Safari")
	{
		$this->HTMLVersion = 4.0;
		$this->JavaScript = true;
		$this->CSS = 2;
		$this->XMLHTTP = true;
		$this->Canvas = ($this->Version >= 418);
	}
	else if ($this->Type == "Lynx")
		$this->TextOnly = 1;
}

} /* End Class it_Browser */
?>