SimpleExcel.php

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<?php
namespace SimpleExcel;

use  SimpleExcel\Exception\SimpleExcelException;

if (!class_exists('Composer\\Autoload\\ClassLoader', false)){
    // autoload all interfaces & classes
    spl_autoload_register(function($class_name){
        if($class_name != 'SimpleExcel') require_once(dirname(__FILE__).DIRECTORY_SEPARATOR.str_replace('\\', DIRECTORY_SEPARATOR, substr($class_name, strlen('SimpleExcel\\'))).'.php');
    });
}

class SimpleExcel
{
    public $parser;

    public $writer;
    
    protected $validParserTypes = array('XML', 'CSV', 'TSV', 'HTML', 'JSON');
    protected $validWriterTypes = array('XML', 'CSV', 'TSV', 'HTML', 'JSON');

    public function __construct($filetype = 'XML'){
        $this->constructParser($filetype);
        $this->constructWriter($filetype);
    }

    public function constructParser($filetype){
        $filetype = strtoupper($filetype);
        if(!in_array($filetype, $this->validParserTypes)){
            throw new \Exception('Filetype '.$filetype.' is not supported', SimpleExcelException::FILETYPE_NOT_SUPPORTED);
        }
        $parser_class = 'SimpleExcel\\Parser\\'.$filetype.'Parser';
        $this->parser = new $parser_class();
    }

    public function constructWriter($filetype){
        $filetype = strtoupper($filetype);

        if(!in_array($filetype, $this->validWriterTypes)){
            throw new \Exception('Filetype '.$filetype.' is not supported', SimpleExcelException::FILETYPE_NOT_SUPPORTED);
        }
        $writer_class = 'SimpleExcel\\Writer\\'.$filetype.'Writer';
        $this->writer = new $writer_class();
    }
    
    public function convertTo($filetype){
        $this->constructWriter($filetype);
        $this->writer->setData($this->parser->getField());
    }
}