<?php
/**
 * DokuWiki Plugin embeddedphp (Syntax Component)
 *
 * @license MIT https://mit-license.org
 * @author	fiwswe <dwplugin@fwml.de>
 */
 
class syntax_plugin_embeddedphp_phpinline extends \dokuwiki\Extension\SyntaxPlugin
{
	/**
	 * Return the tag this plugin instance reacts to
	 *
	 * @return string
	 */
	protected function GetTag(): string
	{
		return 'php';
	}

	/** @inheritDoc */
	public function getType()
	{
		return 'protected';
	}

	/** @inheritDoc */
	public function getSort()
	{
		// The default <php>/<PHP> handler up to "Igor" has priority 180. By setting a
		// lower priority we override the built-in functionality.
		return 179;
	}

	/*
	 * Return the plugin Lexer mode
	 *
	 * @return string
	 */
	protected function getPluginModeName(): string
	{
		return 'plugin_'.$this->getPluginName().'_'.$this->getPluginComponent();
	}

	/** @inheritDoc */
	public function connectTo($mode)
	{
		$p = '<'.$this->GetTag().'\b>(?=.*?</'.$this->GetTag().'>)';
		$m = $this->getPluginModeName();
		$this->Lexer->addEntryPattern($p, $mode, $m);
	}

	/** @inheritDoc */
	public function postConnect()
	{
		$p = '</'.$this->GetTag().'>';
		$m = $this->getPluginModeName();
		$this->Lexer->addExitPattern($p, $m);
	}

	/** @inheritDoc */
	public function handle($match, $state, $pos, Doku_Handler $handler)
	{
		global $INPUT;

		// If we are parsing a submitted comment. Executing embedded PHP in comments is
		// not a good idea!
		if ($INPUT->has('comment')) {
			return false;
		}

		switch($state) {
			case DOKU_LEXER_UNMATCHED :
				// Return the data needed in $this->render() as an array:
				return [$state, $match];
		}

		return false;
	}

	/** @inheritDoc */
	public function render($mode, Doku_Renderer $renderer, $data)
	{
		if ($mode === 'xhtml') {
			if (is_array($data) && (count($data) > 1)) {
				$this->php($data[1], $renderer);

				return true;
			}
		}

		return false;
	}

	/**
	 * Determine whether embedding PHP code is allowed
	 *
	 * @return	bool	true if executing embedded PHP code is allowed
	 */
	protected function allowEmbedding(): bool
	{
		$allow = ($this->getConf('embedphpok') == 1) &&
				 ($this->getConf('privatewiki') == 1);

		return $allow;
	}

	/**
	 * Execute PHP code if allowed
	 *
	 * @param  string $text				 PHP code that is either executed or printed
	 * @param  Doku_Renderer $renderer	 Renderer used for output
	 */
	protected function php($text, Doku_Renderer $renderer): void
	{
		if ($this->allowEmbedding()) {
			ob_start();
			eval($text);
			$o = ob_get_contents();
			if (!empty($o)) {
				if ($this->isBlockElement()) {
					$renderer->doc .= '<div class="embeddedphp">'.$o.'</div>';
				} else {
					$renderer->doc .= '<span class="embeddedphp">'.$o.'</span>';
				}
			}
			ob_end_clean();
		} else {
			$wrapper = $this->isBlockElement() ? 'pre' : 'code';
			$renderer->doc .= /*'###.get_class($this)'.*/p_xhtml_cached_geshi($text, 'php', $wrapper);
		}
	}

	/**
	 * Generic test to differentiate between inline and block modes
	 *
	 * @return bool true if this generates a block element, false otherwise.
	 */
	protected function isBlockElement(): bool
	{
		return false;
	}
}