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<?php

namespace OpenSpout\Common\Helper\Escaper;

/**
 * Provides functions to escape and unescape data for ODS files.
 */
class ODS implements EscaperInterface
{
    /**
     * Escapes the given string to make it compatible with XLSX.
     *
     * @param string $string The string to escape
     *
     * @return string The escaped string
     */
    public function escape($string)
    {
        // @NOTE: Using ENT_QUOTES as XML entities ('<', '>', '&') as well as
        //        single/double quotes (for XML attributes) need to be encoded.
        if (\defined('ENT_DISALLOWED')) {
            /**
             * 'ENT_DISALLOWED' ensures that invalid characters in the given document type are replaced.
             * Otherwise control characters like a vertical tab "\v" will make the XML document unreadable by the XML processor.
             *
             * @see https://github.com/box/spout/issues/329
             */
            $replacedString = htmlspecialchars($string, ENT_QUOTES | ENT_DISALLOWED, 'UTF-8');
        } else {
            // We are on hhvm or any other engine that does not support ENT_DISALLOWED.
            $escapedString = htmlspecialchars($string, ENT_QUOTES, 'UTF-8');

            // control characters values are from 0 to 1F (hex values) in the ASCII table
            // some characters should not be escaped though: "\t", "\r" and "\n".
            $regexPattern = '[\x00-\x08'.
                            // skipping "\t" (0x9) and "\n" (0xA)
                            '\x0B-\x0C'.
                            // skipping "\r" (0xD)
                            '\x0E-\x1F]';
            $replacedString = preg_replace("/{$regexPattern}/", '�', $escapedString);
        }

        return $replacedString;
    }

    /**
     * Unescapes the given string to make it compatible with XLSX.
     *
     * @param string $string The string to unescape
     *
     * @return string The unescaped string
     */
    public function unescape($string)
    {
        // ==============
        // =   WARNING  =
        // ==============
        // It is assumed that the given string has already had its XML entities decoded.
        // This is true if the string is coming from a DOMNode (as DOMNode already decode XML entities on creation).
        // Therefore there is no need to call "htmlspecialchars_decode()".
        return $string;
    }
}