<?php

/**
 * Texy! - human-readable text to HTML converter.
 *
 * @copyright  Copyright (c) 2004, 2010 David Grudl
 * @license    GNU GENERAL PUBLIC LICENSE version 2 or 3
 * @link       http://texy.info
 * @package    Texy
 */


/**
 * Special blocks module.
 *
 * @copyright  Copyright (c) 2004, 2010 David Grudl
 * @package    Texy
 */
final class TexyBlockModule extends TexyModule
{

	public function __construct($texy)
	{
		$this->texy = $texy;

		//$texy->allowed['blocks'] = TRUE;
		$texy->allowed['block/default'] = TRUE;
		$texy->allowed['block/pre'] = TRUE;
		$texy->allowed['block/code'] = TRUE;
		$texy->allowed['block/html'] = TRUE;
		$texy->allowed['block/text'] = TRUE;
		$texy->allowed['block/texysource'] = TRUE;
		$texy->allowed['block/comment'] = TRUE;
		$texy->allowed['block/div'] = TRUE;

		$texy->addHandler('block', array($this, 'solve'));
		$texy->addHandler('beforeBlockParse', array($this, 'beforeBlockParse'));

		$texy->registerBlockPattern(
			array($this, 'pattern'),
			'#^/--++ *+(.*)'.TEXY_MODIFIER_H.'?$((?:\n(?0)|\n.*+)*)(?:\n\\\\--.*$|\z)#mUi',
			'blocks'
		);
	}


	/**
	 * Single block pre-processing.
	 * @param  TexyBlockParser
	 * @param  string
	 * @return void
	 */
	public function beforeBlockParse($parser, & $text)
	{
		// autoclose exclusive blocks
		$text = preg_replace(
			'#^(/--++ *+(?!div|texysource).*)$((?:\n.*+)*?)(?:\n\\\\--.*$|(?=(\n/--.*$)))#mi',
			"\$1\$2\n\\--",
			$text
		);
	}


	/**
	 * Callback for:.
	 *   /-----code html .(title)[class]{style}
	 *     ....
	 *     ....
	 *   \----
	 *
	 * @param  TexyBlockParser
	 * @param  array      regexp matches
	 * @param  string     pattern name
	 * @return TexyHtml|string|FALSE
	 */
	public function pattern($parser, $matches)
	{
		list(, $mParam, $mMod, $mContent) = $matches;
		//    [1] => code | text | ...
		//    [2] => ... additional parameters
		//    [3] => .(title)[class]{style}<>
		//    [4] => ... content

		$mod = new TexyModifier($mMod);
		$parts = preg_split('#\s+#u', $mParam, 2);
		$blocktype = empty($parts[0]) ? 'block/default' : 'block/' . $parts[0];
		$param = empty($parts[1]) ? NULL : $parts[1];

		return $this->texy->invokeAroundHandlers('block', $parser, array($blocktype, $mContent, $param, $mod));
	}


	// for backward compatibility
	function outdent($s)
	{
		trigger_error('Use Texy::outdent()', E_USER_WARNING);
		return Texy::outdent($s);
	}


	/**
	 * Finish invocation.
	 *
	 * @param  TexyHandlerInvocation  handler invocation
	 * @param  string   blocktype
	 * @param  string   content
	 * @param  string   additional parameter
	 * @param  TexyModifier
	 * @return TexyHtml|string|FALSE
	 */
	public function solve($invocation, $blocktype, $s, $param, $mod)
	{
		$tx = $this->texy;
		$parser = $invocation->parser;

		if ($blocktype === 'block/texy') {
			$el = TexyHtml::el();
			$el->parseBlock($tx, $s, $parser->isIndented());
			return $el;
		}

		if (empty($tx->allowed[$blocktype])) return FALSE;

		if ($blocktype === 'block/texysource') {
			$s = Texy::outdent($s);
			if ($s==='') return "\n";
			$el = TexyHtml::el();
			if ($param === 'line') $el->parseLine($tx, $s);
			else $el->parseBlock($tx, $s);
			$s = $el->toHtml($tx);
			$blocktype = 'block/code'; $param = 'html'; // to be continue (as block/code)
		}

		if ($blocktype === 'block/code') {
			$s = Texy::outdent($s);
			if ($s==='') return "\n";
			$s = Texy::escapeHtml($s);
			$s = $tx->protect($s, Texy::CONTENT_BLOCK);
			$el = TexyHtml::el('pre');
			$mod->decorate($tx, $el);
			$el->attrs['class'][] = $param; // lang
			$el->create('code', $s);
			return $el;
		}

		if ($blocktype === 'block/default') {
			$s = Texy::outdent($s);
			if ($s==='') return "\n";
			$el = TexyHtml::el('pre');
			$mod->decorate($tx, $el);
			$el->attrs['class'][] = $param; // lang
			$s = Texy::escapeHtml($s);
			$s = $tx->protect($s, Texy::CONTENT_BLOCK);
			$el->setText($s);
			return $el;
		}

		if ($blocktype === 'block/pre') {
			$s = Texy::outdent($s);
			if ($s==='') return "\n";
			$el = TexyHtml::el('pre');
			$mod->decorate($tx, $el);
			$lineParser = new TexyLineParser($tx, $el);
			// special mode - parse only html tags
			$tmp = $lineParser->patterns;
			$lineParser->patterns = array();
			if (isset($tmp['html/tag'])) $lineParser->patterns['html/tag'] = $tmp['html/tag'];
			if (isset($tmp['html/comment'])) $lineParser->patterns['html/comment'] = $tmp['html/comment'];
			unset($tmp);

			$lineParser->parse($s);
			$s = $el->getText();
			$s = Texy::unescapeHtml($s);
			$s = Texy::escapeHtml($s);
			$s = $tx->unprotect($s);
			$s = $tx->protect($s, Texy::CONTENT_BLOCK);
			$el->setText($s);
			return $el;
		}

		if ($blocktype === 'block/html') {
			$s = trim($s, "\n");
			if ($s==='') return "\n";
			$el = TexyHtml::el();
			$lineParser = new TexyLineParser($tx, $el);
			// special mode - parse only html tags
			$tmp = $lineParser->patterns;
			$lineParser->patterns = array();
			if (isset($tmp['html/tag'])) $lineParser->patterns['html/tag'] = $tmp['html/tag'];
			if (isset($tmp['html/comment'])) $lineParser->patterns['html/comment'] = $tmp['html/comment'];
			unset($tmp);

			$lineParser->parse($s);
			$s = $el->getText();
			$s = Texy::unescapeHtml($s);
			$s = Texy::escapeHtml($s);
			$s = $tx->unprotect($s);
			return $tx->protect($s, Texy::CONTENT_BLOCK) . "\n";
		}

		if ($blocktype === 'block/text') {
			$s = trim($s, "\n");
			if ($s==='') return "\n";
			$s = Texy::escapeHtml($s);
			$s = str_replace("\n", TexyHtml::el('br')->startTag() , $s); // nl2br
			return $tx->protect($s, Texy::CONTENT_BLOCK) . "\n";
		}

		if ($blocktype === 'block/comment') {
			return "\n";
		}

		if ($blocktype === 'block/div') {
			$s = Texy::outdent($s);
			if ($s==='') return "\n";
			$el = TexyHtml::el('div');
			$mod->decorate($tx, $el);
			$el->parseBlock($tx, $s, $parser->isIndented()); // TODO: INDENT or NORMAL ?
			return $el;
		}

		return FALSE;
	}

}