<?php

// Set up the global CI functions in their most minimal core representation

function &get_instance() 
{
	$test = CI_TestCase::instance();
	$instance = $test->ci_instance();
	return $instance;
}

// --------------------------------------------------------------------

function &get_config() {
	$test = CI_TestCase::instance();
	$config = $test->ci_get_config();
		
	return $config;
}

function config_item($item)
{
	$config =& get_config();
	
	if ( ! isset($config[$item]))
	{
		return FALSE;
	}
	
	return $config[$item];
}

// --------------------------------------------------------------------

function load_class($class, $directory = 'libraries', $prefix = 'CI_')
{
	if ($directory != 'core' OR $prefix != 'CI_')
	{
		throw new Exception('Not Implemented: Non-core load_class()');
	}
	
	$test = CI_TestCase::instance();
	
	$obj =& $test->ci_core_class($class);
	
	if (is_string($obj))
	{
		throw new Exception('Bad Isolation: Use ci_set_core_class to set '.$class.'');
	}
	
	return $obj;
}

// This is sort of meh. Should probably be mocked up with
// controllable output, so that we can test some of our
// security code. The function itself will be tested in the
// bootstrap testsuite.
// --------------------------------------------------------------------

function remove_invisible_characters($str, $url_encoded = TRUE)
{
	$non_displayables = array();
	
	// every control character except newline (dec 10)
	// carriage return (dec 13), and horizontal tab (dec 09)
	
	if ($url_encoded)
	{
		$non_displayables[] = '/%0[0-8bcef]/';	// url encoded 00-08, 11, 12, 14, 15
		$non_displayables[] = '/%1[0-9a-f]/';	// url encoded 16-31
	}
	
	$non_displayables[] = '/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S';	// 00-08, 11, 12, 14-31, 127

	do
	{
		$str = preg_replace($non_displayables, '', $str, -1, $count);
	}
	while ($count);

	return $str;
}


// Clean up error messages
// --------------------------------------------------------------------

function show_error($message, $status_code = 500, $heading = 'An Error Was Encountered')
{
	throw new Exception('CI Error: '.$message);
}

function show_404($page = '', $log_error = TRUE)
{
	throw new Exception('CI Error: 404');
}

function _exception_handler($severity, $message, $filepath, $line)
{
	throw new Exception('CI Exception: '.$message.' | '.$filepath.' | '.$line);
}


// We assume a few things about our environment ...
// --------------------------------------------------------------------

function is_php($version = '5.0.0')
{
	return ! (version_compare(PHP_VERSION, $version) < 0);
}

function is_really_writable($file)
{
	return is_writable($file);
}

function is_loaded()
{
	throw new Exception('Bad Isolation: mock up environment');
}

function log_message($level = 'error', $message, $php_error = FALSE)
{
	return TRUE;
}

function set_status_header($code = 200, $text = '')
{
	return TRUE;
}

// EOF