<?php

/*
	Phoronix Test Suite
	URLs: http://www.phoronix.com, http://www.phoronix-test-suite.com/
	Copyright (C) 2008, Phoronix Media
	Copyright (C) 2004-2008, Michael Larabel
	tandem_XmlReader.php: The XML reading object for the Phoronix Test Suite.

	Additional Notes: A very simple XML parser with a few extras... Does not currently support attributes on tags, etc.
	A work in progress. This was originally designed for just some select needs in the past. No XML validation is done with this parser, etc.

	This program 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.

	This program 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/>.
*/

class tandem_XmlReader
{
	var $xml_data = ""; // XML contents
	var $xml_file_time = null; // File modification time
	var $xml_file_name = null; // File name

	var $xml_cache_file = false; // Cache the entire XML file being parsed?
	var $xml_cache_tags = true; // Cache the tags that are being called?

	var $tag_fallback_value = null; // Fallback value if tag is not present

	static $tag_cache = null; // The cache for the tag cache
	static $file_cache = null; // The cache for the file cache

	function __construct($read_xml, $cache_support = true)
	{
		if(is_readable($read_xml))
		{
			if($cache_support)
			{
				$this->xml_cache_file = false;
				$this->xml_cache_tags = false;
			}

			// If you are going to be banging XML files hard through the course of the script, you will want to flush the PHP file cache
			// clearstatcache();

			$this->xml_file_time = filemtime($read_xml);
			$this->xml_file_name = $read_xml;

			if($this->xml_cache_file && isset(self::$file_cache[$this->xml_file_name][$this->xml_file_time]))
			{
				$this->xml_data = self::$file_cache[$this->xml_file_name][$this->xml_file_time];
			}

			if(empty($this->xml_data))
			{
				$this->xml_data = file_get_contents($read_xml);

				if($this->xml_cache_file)
				{
					self::$file_cache[$this->xml_file_name][$this->xml_file_time] = $this->xml_data;
				}
			}
		}
		else
		{
			$this->xml_cache_file = false;
			$this->xml_cache_tags = false;
			$this->xml_data = $read_xml;
		}
	}
	function getStatement($statement)
	{
		return $this->listStatements(true, $statement);
	}
	function listStatements($perform_search = false, $search_query = "")
	{
		$return_r = array();
		$comment_statements = $this->parseLineCommentsFromFile();

		foreach($comment_statements as $statement)
		{
			$name = substr($statement, 0, strpos($statement, ":"));
			$name = trim(strstr($name, " "));

			if($perform_search && !empty($search_query))
			{
				if($name == $search_query)
				{
					$value = trim(substr(strstr($statement, ":"), 1));
					array_push($return_r, $value);
				}
			}
			else
			{
				array_push($return_r, $name);
			}
		}

		return $return_r;
	}
	function getXMLValue($xml_tag)
	{
		return $this->getValue($xml_tag);
	}
	function isDefined($xml_tag)
	{
		return $this->getValue($xml_tag) != null;
	}
	function getValue($xml_path, $xml_tag = null, $xml_match = null, $cache_tag = true, $is_fallback_call = false)
	{
		if($xml_tag == null)
		{
			$xml_tag = $xml_path;
		}
		if($xml_match == null)
		{
			$xml_match = $this->xml_data;
		}

		if($this->xml_cache_tags && $cache_tag && isset(self::$tag_cache[$this->xml_file_name][$this->xml_file_time][$xml_tag]))
		{
			$xml_match = self::$tag_cache[$this->xml_file_name][$this->xml_file_time][$xml_tag];
		}
		else
		{
			foreach(explode("/", $xml_tag) as $xml_step)
			{
				$xml_match = $this->parseXMLString($xml_step, $xml_match, false);

				if($xml_match == false)
				{
					if($is_fallback_call != true)
					{
						$xml_match = $this->handleXmlZeroTagFallback($xml_path);
					}
					else
					{
						$xml_match = $this->tag_fallback_value;
					}
				}
			}

			if($this->xml_cache_tags && $cache_tag)
			{
				self::$tag_cache[$this->xml_file_name][$this->xml_file_time][$xml_tag] = $xml_match;
			}
		}

		return $xml_match;
	}
	function parseXMLString($xml_tag, $to_parse, $multi_search = true)
	{
		$return = false;
		$temp_r = array();
		$temp = $to_parse;

		$open_tag = "<" . $xml_tag . ">";
		$close_tag  = "</" . $xml_tag . ">";
		$open_tag_length = strlen($open_tag);
		$close_tag_length = strlen($close_tag);

		do
		{
			$return = null;

			if(($start = strpos($temp, $open_tag)) !== false)
			{
				$temp = substr($temp, $start + $open_tag_length);

				if(($end = strpos($temp, $close_tag)) !== false)
				{
					$return = substr($temp, 0, $end);
					$temp = substr($temp, strlen($return) + $close_tag_length);
				}
			}

			if($return != null)
			{
				array_push($temp_r, $return);
			}
		}
		while($return != null && $multi_search);

		if(count($temp_r) > 0)
		{
			$return = $temp_r;

			if($multi_search == false)
			{
				$return = $return[0];
			}
		}

		return $return;
	}
	function parseLineCommentsFromFile($read_from = null)
	{
		if(empty($read_from))
		{
			$read_from = $this->xml_data;
		}

		$return_r = array();
		$temp = $read_from;

		do
		{
			$return = null;

			if(($start = strpos($temp, "<!--")) !== false)
			{
				$temp = substr($temp, $start + 4);

				if(($end = strpos($temp, "-->")) !== false)
				{
					$return = substr($temp, 0, $end);
					$temp = substr($temp, strlen($return) + 3);
				}
			}

			if($return != null)
			{
				array_push($return_r, $return);
			}
		}
		while($return != null);

		return $return_r;
	}
	function handleXmlZeroTagFallback($xml_tag)
	{
		return $this->tag_fallback_value;
	}
	function getXMLValues($xml_tag)
	{
		return $this->getXMLArrayValues($xml_tag);
	}
	function getXMLArrayValues($xml_tag)
	{
		return $this->getArrayValues($xml_tag, $this->xml_data);
	}
	function getArrayValues($xml_tag, $xml_match)
	{
		$xml_steps = explode("/", $xml_tag);
		$xml_steps_count = count($xml_steps);
		$this_xml = $xml_match;

		for($i = 0; $i < ($xml_steps_count - 2); $i++)
		{
			$this_xml = $this->getValue($xml_tag, $xml_steps[$i], $this_xml, false);
		}

		$xml_matches = $this->parseXMLString($xml_steps[($xml_steps_count - 2)], $this_xml);
		$xml_matches_count = count($xml_matches);

		$return_r = array();
		$extraction_tags = explode(",", end($xml_steps));
		$extraction_tags_count = count($extraction_tags);

		for($i = 0; $i < $xml_matches_count; $i++)
		{
			if($extraction_tags_count == 1)
			{
				$this_item = $this->getValue($xml_tag, $extraction_tags[0], $xml_matches[$i], false);
				array_push($return_r, $this_item);
			}
			else
			{
				if($i == 0)
				{
					foreach($extraction_tags as $extract)
					{
						$return_r[$extract] = array();
					}
				}

				foreach($extraction_tags as $extract)
				{
					$this_item = $this->getValue($xml_tag, $extract, $xml_matches[$i], false);
					array_push($return_r[$extract], $this_item);
				}
			}
		}
		return $return_r;
	}
	function setFileCaching($do_cache)
	{
		$this->xml_cache_file = ($do_cache == true);
	}
	function setTagCaching($do_cache)
	{
		$this->xml_cache_tags = ($do_cache == true);
	}
	function setCaching($do_cache)
	{
		$this->setFileCaching($do_cache);
		$this->setTagCaching($do_cache);
	}
}

?>