<?php
//
// Copyright (c) 2004 by Adam Stiles, adam@stilesoft.com.
// Licensed under the GNU General Public License.
// See: http://www.gnu.org/licenses/gpl.txt
//
// Class SuggestGetter. Simple class which parsers the results
// of a Google Suggest query 
//
//------------------------------------------------------------------------------
class SuggestGetter
{
	//--------------------------------------------------------------------------
	function GetSuggest($keyword)
	{
		$items = array();
		$url = $this->buildSuggestUrl($keyword);
		$data = $this->getRawSuggest($url);
		if ($data) {
			//
			// This parsing code could probably be a lot simpler if we used regex,
			// but that's not my strong point, so just do a bruteforce parse here.
			//			
			$data = strstr($data, 'new Array(');
			if ($data === FALSE) return $items;
			
			//
			// Trim off the 'new Array('
			//
			$data = substr($data, strlen('new Array('));			
			$i = strpos($data, ')');
			if ($i === FALSE) return $items;
			$tmp = substr($data, 0, $i - 1);
			$tmp = str_replace('"', "", $tmp);
			$keys = explode(",", $tmp);
			
			//
			// skip to next array
			// TODO: this should be refactored... similar to code above
			//
			$data = strstr($data, 'new Array(');
			if ($data === FALSE) return $items;
			$data = substr($data, strlen('new Array('));			
			$i = strpos($data, ')');
			if ($i === FALSE) return $items;
			$tmp = substr($data, 0, $i - 1);
			$values = explode('",', $tmp);
			$values = array_map("stripQuotes", $values);
			if (count($keys) == count($values)) {
				$items = $this->safeArrayCombine($keys, $values);				
			}
		}
		return $items;		
	}
	//--------------------------------------------------------------------------
	function buildSuggestUrl($keyword)
	{
		return "http://www.google.com/complete/search?hl=en&js=true&qu=" . urlencode($keyword);
	}
	
	//--------------------------------------------------------------------------
	//
	// Grab the raw data from Google Suggest. Uses curl, but could easily be mod'ed
	// to use another method, raw sockets, etc.
	//
	function getRawSuggest($url)
	{
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_HEADER, FALSE);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
		$data = curl_exec($ch);
		curl_close($ch);
		if (!($data === FALSE)) {
			return $data;
		} else {
			return false;
		}			
	}
	
	//--------------------------------------------------------------------------
	//
	// From public domain comment found on php.net:
	// http://www.php.net/manual/en/function.array-combine.php
	// by m71 at free dot net, 22-Oct-2004, 06:39
	//
	function safeArrayCombine($a, $b) 
	{
  		if (count($a)!=count($b)) return FALSE;
  		foreach($a as $key) list(,$c[$key])=each($b);
  		return $c;
	}
	//--------------------------------------------------------------------------		
}
//------------------------------------------------------------------------------
//
// Callback used to strip quotes from an array
//
function stripQuotes($item)
{
	return str_replace('"', "", $item);
}
//------------------------------------------------------------------------------