DefaultInline.php

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<?php
namespace TYPO3\CMS\Rtehtmlarea\Extension;

class DefaultInline extends \TYPO3\CMS\Rtehtmlarea\RteHtmlAreaApi {

    protected $extensionKey = 'rtehtmlarea';

    // The key of the extension that is extending htmlArea RTE
    protected $pluginName = 'DefaultInline';

    // The name of the plugin registered by the extension
    protected $relativePathToLocallangFile = 'extensions/DefaultInline/locallang.xlf';

    // Path to this main locallang file of the extension relative to the extension dir.
    protected $relativePathToSkin = 'extensions/DefaultInline/skin/htmlarea.css';

    // Path to the skin (css) file relative to the extension dir.
    protected $htmlAreaRTE;

    // Reference to the invoking object
    protected $thisConfig;

    // Reference to RTE PageTSConfig
    protected $toolbar;

    // Reference to RTE toolbar array
    protected $LOCAL_LANG;

    // Frontend language array
    protected $pluginButtons = 'bold,italic,strikethrough,subscript,superscript,underline';

    protected $convertToolbarForHtmlAreaArray = array(
        'bold' => 'Bold',
        'italic' => 'Italic',
        'underline' => 'Underline',
        'strikethrough' => 'StrikeThrough',
        'superscript' => 'Superscript',
        'subscript' => 'Subscript'
    );

    public function buildJavascriptConfiguration($RTEcounter) {
        global $TSFE, $LANG;
        $registerRTEinJavascriptString = '';
        return $registerRTEinJavascriptString;
    }

    public function transformContent($content) {
        // Change the strong and em tags for gecko browsers
        if ($this->htmlAreaRTE->client['browser'] == 'gecko') {
            // change <strong> to <b>
            $content = preg_replace('/<(\\/?)strong/i', '<$1b', $content);
            // change <em> to <i>
            $content = preg_replace('/<(\\/?)em([^b>]*>)/i', '<$1i$2', $content);
        }
        return $content;
    }

}