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<?php
namespace Restserver\Libraries;
use Exception;

defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Format class
 * Help convert between various formats such as XML, JSON, CSV, etc.
 *
 * @author    Phil Sturgeon, Chris Kacerguis, @softwarespot
 * @license   http://www.dbad-license.org/
 */
class Format {

/**
     * Array output format
     */
    const ARRAY_FORMAT = 'array';

/**
     * Comma Separated Value (CSV) output format
     */
    const CSV_FORMAT = 'csv';

/**
     * Json output format
     */
    const JSON_FORMAT = 'json';

/**
     * HTML output format
     */
    const HTML_FORMAT = 'html';

/**
     * PHP output format
     */
    const PHP_FORMAT = 'php';

/**
     * Serialized output format
     */
    const SERIALIZED_FORMAT = 'serialized';

/**
     * XML output format
     */
    const XML_FORMAT = 'xml';

/**
     * Default format of this class
     */
    const DEFAULT_FORMAT = self::JSON_FORMAT; // Couldn't be DEFAULT, as this is a keyword

/**
     * CodeIgniter instance
     *
     * @var object
     */
    private $_CI;

/**
     * Data to parse
     *
     * @var mixed
     */
    protected $_data = [];

/**
     * Type to convert from
     *
     * @var string
     */
    protected $_from_type = NULL;

/**
     * DO NOT CALL THIS DIRECTLY, USE factory()
     *
     * @param NULL $data
     * @param NULL $from_type
     * @throws Exception
     */

public function __construct($data = NULL, $from_type = NULL)
    {
        // Get the CodeIgniter reference
        $this->_CI = &get_instance();

// Load the inflector helper
        $this->_CI->load->helper('inflector');

// If the provided data is already formatted we should probably convert it to an array
        if ($from_type !== NULL)
        {
            if (method_exists($this, '_from_'.$from_type))
            {
                $data = call_user_func([$this, '_from_'.$from_type], $data);
            }
            else
            {
                throw new Exception('Format class does not support conversion from "'.$from_type.'".');
            }
        }

// Set the member variable to the data passed
        $this->_data = $data;
    }

/**
     * Create an instance of the format class
     *
     * @param mixed $data Data to convert/parse
     * @param string $from_type Type to convert from e.g. json, csv, html
     *
     * @return object Instance of the format class
     */
    public static function factory($data, $from_type = NULL)
    {
        // $class = __CLASS__;
        // return new $class();

return new static($data, $from_type);
    }

// FORMATTING OUTPUT ---------------------------------------------------------

/**
     * Format data as an array
     *
     * @param mixed|NULL $data Optional data to pass, so as to override the data passed
     * to the constructor
     * @return array Data parsed as an array; otherwise, an empty array
     */
    public function to_array($data = NULL)
    {
        // If no data is passed as a parameter, then use the data passed
        // via the constructor
        if ($data === NULL && func_num_args() === 0)
        {
            $data = $this->_data;
        }

// Cast as an array if not already
        if (is_array($data) === FALSE)
        {
            $data = (array) $data;
        }

$array = [];
        foreach ((array) $data as $key => $value)
        {
            if (is_object($value) === TRUE || is_array($value) === TRUE)
            {
                $array[$key] = $this->to_array($value);
            }
            else
            {
                $array[$key] = $value;
            }
        }

return $array;
    }

/**
     * Format data as XML
     *
     * @param mixed|NULL $data Optional data to pass, so as to override the data passed
     * to the constructor
     * @param NULL $structure
     * @param string $basenode
     * @return mixed
     */
    public function to_xml($data = NULL, $structure = NULL, $basenode = 'xml')
    {
        if ($data === NULL && func_num_args() === 0)
        {
            $data = $this->_data;
        }

if ($structure === NULL)
        {
            $structure = simplexml_load_string("<?xml version='1.0' encoding='utf-8'?><$basenode />");
        }

// Force it to be something useful
        if (is_array($data) === FALSE && is_object($data) === FALSE)
        {
            $data = (array) $data;
        }

foreach ($data as $key => $value)
        {

//change false/true to 0/1
            if (is_bool($value))
            {
                $value = (int) $value;
            }

// no numeric keys in our xml please!
            if (is_numeric($key))
            {
                // make string key...
                $key = (singular($basenode) != $basenode) ? singular($basenode) : 'item';
            }

// replace anything not alpha numeric
            $key = preg_replace('/[^a-z_\-0-9]/i', '', $key);

if ($key === '_attributes' && (is_array($value) || is_object($value)))
            {
                $attributes = $value;
                if (is_object($attributes))
                {
                    $attributes = get_object_vars($attributes);
                }

foreach ($attributes as $attribute_name => $attribute_value)
                {
                    $structure->addAttribute($attribute_name, $attribute_value);
                }
            }
            // if there is another array found recursively call this function
            elseif (is_array($value) || is_object($value))
            {
                $node = $structure->addChild($key);

// recursive call.
                $this->to_xml($value, $node, $key);
            }
            else
            {
                // add single node.
                $value = htmlspecialchars(html_entity_decode($value, ENT_QUOTES, 'UTF-8'), ENT_QUOTES, 'UTF-8');

$structure->addChild($key, $value);
            }
        }

return $structure->asXML();
    }

/**
     * Format data as HTML
     *
     * @param mixed|NULL $data Optional data to pass, so as to override the data passed
     * to the constructor
     * @return mixed
     */
    public function to_html($data = NULL)
    {
        // If no data is passed as a parameter, then use the data passed
        // via the constructor
        if ($data === NULL && func_num_args() === 0)
        {
            $data = $this->_data;
        }

// Cast as an array if not already
        if (is_array($data) === FALSE)
        {
            $data = (array) $data;
        }

// Check if it's a multi-dimensional array
        if (isset($data[0]) && count($data) !== count($data, COUNT_RECURSIVE))
        {
            // Multi-dimensional array
            $headings = array_keys($data[0]);
        }
        else
        {
            // Single array
            $headings = array_keys($data);
            $data = [$data];
        }

// Load the table library
        $this->_CI->load->library('table');

$this->_CI->table->set_heading($headings);

foreach ($data as $row)
        {
            // Suppressing the "array to string conversion" notice
            // Keep the "evil" @ here
            $row = @array_map('strval', $row);

$this->_CI->table->add_row($row);
        }

return $this->_CI->table->generate();
    }

/**
     * @link http://www.metashock.de/2014/02/create-csv-file-in-memory-php/
     * @param mixed|NULL $data Optional data to pass, so as to override the data passed
     * to the constructor
     * @param string $delimiter The optional delimiter parameter sets the field
     * delimiter (one character only). NULL will use the default value (,)
     * @param string $enclosure The optional enclosure parameter sets the field
     * enclosure (one character only). NULL will use the default value (")
     * @return string A csv string
     */
    public function to_csv($data = NULL, $delimiter = ',', $enclosure = '"')
    {
        // Use a threshold of 1 MB (1024 * 1024)
        $handle = fopen('php://temp/maxmemory:1048576', 'w');
        if ($handle === FALSE)
        {
            return NULL;
        }

// If no data is passed as a parameter, then use the data passed
        // via the constructor
        if ($data === NULL && func_num_args() === 0)
        {
            $data = $this->_data;
        }

// If NULL, then set as the default delimiter
        if ($delimiter === NULL)
        {
            $delimiter = ',';
        }

// If NULL, then set as the default enclosure
        if ($enclosure === NULL)
        {
            $enclosure = '"';
        }

// Cast as an array if not already
        if (is_array($data) === FALSE)
        {
            $data = (array) $data;
        }

// Apply the headings
        fputcsv($handle, $headings, $delimiter, $enclosure);

foreach ($data as $record)
        {
            // If the record is not an array, then break. This is because the 2nd param of
            // fputcsv() should be an array
            if (is_array($record) === FALSE)
            {
                break;
            }

// Suppressing the "array to string conversion" notice.
            // Keep the "evil" @ here.
            $record = @ array_map('strval', $record);

// Returns the length of the string written or FALSE
            fputcsv($handle, $record, $delimiter, $enclosure);
        }

// Reset the file pointer
        rewind($handle);

// Retrieve the csv contents
        $csv = stream_get_contents($handle);

// Close the handle
        fclose($handle);

// Convert UTF-8 encoding to UTF-16LE which is supported by MS Excel
        $csv = mb_convert_encoding($csv, 'UTF-16LE', 'UTF-8');

return $csv;
    }

/**
     * Encode data as json
     *
     * @param mixed|NULL $data Optional data to pass, so as to override the data passed
     * to the constructor
     * @return string Json representation of a value
     */
    public function to_json($data = NULL)
    {
        // If no data is passed as a parameter, then use the data passed
        // via the constructor
        if ($data === NULL && func_num_args() === 0)
        {
            $data = $this->_data;
        }

// Get the callback parameter (if set)
        $callback = $this->_CI->input->get('callback');

if (empty($callback) === TRUE)
        {
            return json_encode($data, JSON_UNESCAPED_UNICODE);
        }

// We only honour a jsonp callback which are valid javascript identifiers
        elseif (preg_match('/^[a-z_\$][a-z0-9\$_]*(\.[a-z_\$][a-z0-9\$_]*)*$/i', $callback))
        {
            // Return the data as encoded json with a callback
            return $callback.'('.json_encode($data, JSON_UNESCAPED_UNICODE).');';
        }

// An invalid jsonp callback function provided.
        // Though I don't believe this should be hardcoded here
        $data['warning'] = 'INVALID JSONP CALLBACK: '.$callback;

return json_encode($data, JSON_UNESCAPED_UNICODE);
    }

/**
     * Encode data as a serialized array
     *
     * @param mixed|NULL $data Optional data to pass, so as to override the data passed
     * to the constructor
     * @return string Serialized data
     */
    public function to_serialized($data = NULL)
    {
        // If no data is passed as a parameter, then use the data passed
        // via the constructor
        if ($data === NULL && func_num_args() === 0)
        {
            $data = $this->_data;
        }

return serialize($data);
    }

/**
     * Format data using a PHP structure
     *
     * @param mixed|NULL $data Optional data to pass, so as to override the data passed
     * to the constructor
     * @return mixed String representation of a variable
     */
    public function to_php($data = NULL)
    {
        // If no data is passed as a parameter, then use the data passed
        // via the constructor
        if ($data === NULL && func_num_args() === 0)
        {
            $data = $this->_data;
        }

return var_export($data, TRUE);
    }

// INTERNAL FUNCTIONS

/**
     * @param string $data XML string
     * @return array XML element object; otherwise, empty array
     */
    protected function _from_xml($data)
    {
        return $data ? (array) simplexml_load_string($data, 'SimpleXMLElement', LIBXML_NOCDATA) : [];
    }

/**
     * @param string $data CSV string
     * @param string $delimiter The optional delimiter parameter sets the field
     * delimiter (one character only). NULL will use the default value (,)
     * @param string $enclosure The optional enclosure parameter sets the field
     * enclosure (one character only). NULL will use the default value (")
     * @return array A multi-dimensional array with the outer array being the number of rows
     * and the inner arrays the individual fields
     */
    protected function _from_csv($data, $delimiter = ',', $enclosure = '"')
    {
        // If NULL, then set as the default delimiter
        if ($delimiter === NULL)
        {
            $delimiter = ',';
        }

// If NULL, then set as the default enclosure
        if ($enclosure === NULL)
        {
            $enclosure = '"';
        }

return str_getcsv($data, $delimiter, $enclosure);
    }

/**
     * @param string $data Encoded json string
     * @return mixed Decoded json string with leading and trailing whitespace removed
     */
    protected function _from_json($data)
    {
        return json_decode(trim($data));
    }

/**
     * @param string $data Data to unserialize
     * @return mixed Unserialized data
     */
    protected function _from_serialize($data)
    {
        return unserialize(trim($data));
    }

/**
     * @param string $data Data to trim leading and trailing whitespace
     * @return string Data with leading and trailing whitespace removed
     */
    protected function _from_php($data)
    {
        return trim($data);
    }
}

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