<?php

class testDataFileIterator implements Iterator
{
    protected $file;
    protected $key = 0;
    protected $current;

    public function __construct($file)
    {
        $this->file = fopen($file, 'r');
    }

    public function __destruct()
    {
        fclose($this->file);
    }

    public function rewind()
    {
        rewind($this->file);
        $this->current = $this->_parseNextDataset();
        $this->key = 0;
    }

    public function valid()
    {
        return !feof($this->file);
    }

    public function key()
    {
        return $this->key;
    }

    public function current()
    {
        return $this->current;
    }

    public function next()
    {
        $this->current = $this->_parseNextDataset();
        $this->key++;
    }

    private function _parseNextDataset()
    {
        //    Read a line of test data from the file
        do {
            //    Only take lines that contain test data and that aren't commented out
            $testDataRow = trim(fgets($this->file));
        } while (($testDataRow > '') && ($testDataRow[0] === '#'));

        //    Discard any comments at the end of the line
        list($testData) = explode('//', $testDataRow);

        //    Split data into an array of individual values and a result
        $dataSet = $this->_getcsv($testData, ',', "'");
        foreach ($dataSet as &$dataValue) {
            $dataValue = $this->_parseDataValue($dataValue);
        }
        unset($dataValue);

        return $dataSet;
    }

    private function _getcsv($input, $delimiter, $enclosure)
    {
        if (function_exists('str_getcsv')) {
            return str_getcsv($input, $delimiter, $enclosure);
        }

        $temp = fopen('php://memory', 'rw');
        fwrite($temp, $input);
        rewind($temp);
        $data = fgetcsv($temp, strlen($input), $delimiter, $enclosure);
        fclose($temp);

        if ($data === false) {
            $data = array(null);
        }

        return $data;
    }

    private function _parseDataValue($dataValue)
    {
        //    discard any white space
        $dataValue = trim($dataValue);
        //    test for the required datatype and convert accordingly
        if (!is_numeric($dataValue)) {
            if ($dataValue == '') {
                $dataValue = null;
            } elseif ($dataValue == '""') {
                $dataValue = '';
            } elseif (($dataValue[0] == '"') && ($dataValue[strlen($dataValue)-1] == '"')) {
                $dataValue = substr($dataValue, 1, -1);
            } elseif (($dataValue[0] == '{') && ($dataValue[strlen($dataValue)-1] == '}')) {
                $dataValue = explode(';', substr($dataValue, 1, -1));
                foreach ($dataValue as &$dataRow) {
                    if (strpos($dataRow, '|') !== false) {
                        $dataRow = explode('|', $dataRow);
                        foreach ($dataRow as &$dataCell) {
                            $dataCell = $this->_parseDataValue($dataCell);
                        }
                        unset($dataCell);
                    } else {
                        $dataRow = $this->_parseDataValue($dataRow);
                    }
                }
                unset($dataRow);
            } else {
                switch (strtoupper($dataValue)) {
                    case 'NULL':
                        $dataValue = null;
                        break;
                    case 'TRUE':
                        $dataValue = true;
                        break;
                    case 'FALSE':
                        $dataValue = false;
                        break;
                }
            }
        } else {
            if (strpos($dataValue, '.') !== false) {
                $dataValue = (float) $dataValue;
            } else {
                $dataValue = (int) $dataValue;
            }
        }

        return $dataValue;
    }
}