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Diffstat (limited to 'vendor/pixel418/markdownify/src/Converter.php')
| -rw-r--r-- | vendor/pixel418/markdownify/src/Converter.php | 1400 |
1 files changed, 1400 insertions, 0 deletions
diff --git a/vendor/pixel418/markdownify/src/Converter.php b/vendor/pixel418/markdownify/src/Converter.php new file mode 100644 index 000000000..77c62dc7e --- /dev/null +++ b/vendor/pixel418/markdownify/src/Converter.php @@ -0,0 +1,1400 @@ +<?php + +/* This file is part of the Markdownify project, which is under LGPL license */ + +namespace Markdownify; + +/** + * default configuration + */ +define('MDFY_BODYWIDTH', false); +define('MDFY_KEEPHTML', true); + +/** + * HTML to Markdown converter class + */ +class Converter +{ + /** + * html parser object + * + * @var parseHTML + */ + protected $parser; + + /** + * markdown output + * + * @var string + */ + protected $output; + + /** + * stack with tags which where not converted to html + * + * @var array<string> + */ + protected $notConverted = array(); + + /** + * skip conversion to markdown + * + * @var bool + */ + protected $skipConversion = false; + + /* options */ + + /** + * keep html tags which cannot be converted to markdown + * + * @var bool + */ + protected $keepHTML = false; + + /** + * wrap output, set to 0 to skip wrapping + * + * @var int + */ + protected $bodyWidth = 0; + + /** + * minimum body width + * + * @var int + */ + protected $minBodyWidth = 25; + + /** + * position where the link reference will be displayed + * + * + * @var int + */ + protected $linkPosition; + const LINK_AFTER_CONTENT = 0; + const LINK_AFTER_PARAGRAPH = 1; + const LINK_IN_PARAGRAPH = 2; + + /** + * stores current buffers + * + * @var array<string> + */ + protected $buffer = array(); + + /** + * stores current buffers + * + * @var array<string> + */ + protected $footnotes = array(); + + /** + * tags with elements which can be handled by markdown + * + * @var array<string> + */ + protected $isMarkdownable = array( + 'p' => array(), + 'ul' => array(), + 'ol' => array(), + 'li' => array(), + 'br' => array(), + 'blockquote' => array(), + 'code' => array(), + 'pre' => array(), + 'a' => array( + 'href' => 'required', + 'title' => 'optional', + ), + 'strong' => array(), + 'b' => array(), + 'em' => array(), + 'i' => array(), + 'img' => array( + 'src' => 'required', + 'alt' => 'optional', + 'title' => 'optional', + ), + 'h1' => array(), + 'h2' => array(), + 'h3' => array(), + 'h4' => array(), + 'h5' => array(), + 'h6' => array(), + 'hr' => array(), + ); + + /** + * html tags to be ignored (contents will be parsed) + * + * @var array<string> + */ + protected $ignore = array( + 'html', + 'body', + ); + + /** + * html tags to be dropped (contents will not be parsed!) + * + * @var array<string> + */ + protected $drop = array( + 'script', + 'head', + 'style', + 'form', + 'area', + 'object', + 'param', + 'iframe', + ); + + /** + * html block tags that allow inline & block children + * + * @var array<string> + */ + protected $allowMixedChildren = array( + 'li' + ); + + /** + * Markdown indents which could be wrapped + * @note: use strings in regex format + * + * @var array<string> + */ + protected $wrappableIndents = array( + '\* ', // ul + '\d. ', // ol + '\d\d. ', // ol + '> ', // blockquote + '', // p + ); + + /** + * list of chars which have to be escaped in normal text + * @note: use strings in regex format + * + * @var array + * + * TODO: what's with block chars / sequences at the beginning of a block? + */ + protected $escapeInText = array( + '\*\*([^*]+)\*\*' => '\*\*$1\*\*', // strong + '\*([^*]+)\*' => '\*$1\*', // em + '__(?! |_)(.+)(?!<_| )__' => '\_\_$1\_\_', // strong + '_(?! |_)(.+)(?!<_| )_' => '\_$1\_', // em + '([-*_])([ ]{0,2}\1){2,}' => '\\\\$0', // hr + '`' => '\`', // code + '\[(.+)\](\s*\()' => '\[$1\]$2', // links: [text] (url) => [text\] (url) + '\[(.+)\](\s*)\[(.*)\]' => '\[$1\]$2\[$3\]', // links: [text][id] => [text\][id\] + '^#(#{0,5}) ' => '\#$1 ', // header + ); + + /** + * wether last processed node was a block tag or not + * + * @var bool + */ + protected $lastWasBlockTag = false; + + /** + * name of last closed tag + * + * @var string + */ + protected $lastClosedTag = ''; + + /** + * number of line breaks before next inline output + */ + protected $lineBreaks = 0; + + /** + * node stack, e.g. for <a> and <abbr> tags + * + * @var array<array> + */ + protected $stack = array(); + + /** + * current indentation + * + * @var string + */ + protected $indent = ''; + + /** + * constructor, set options, setup parser + * + * @param int $linkPosition define the position of links + * @param int $bodyWidth whether or not to wrap the output to the given width + * defaults to false + * @param bool $keepHTML whether to keep non markdownable HTML or to discard it + * defaults to true (HTML will be kept) + * @return void + */ + public function __construct($linkPosition = self::LINK_AFTER_CONTENT, $bodyWidth = MDFY_BODYWIDTH, $keepHTML = MDFY_KEEPHTML) + { + $this->linkPosition = $linkPosition; + $this->keepHTML = $keepHTML; + + if ($bodyWidth > $this->minBodyWidth) { + $this->bodyWidth = intval($bodyWidth); + } else { + $this->bodyWidth = false; + } + + $this->parser = new Parser; + $this->parser->noTagsInCode = true; + + // we don't have to do this every time + $search = array(); + $replace = array(); + foreach ($this->escapeInText as $s => $r) { + array_push($search, '@(?<!\\\)' . $s . '@U'); + array_push($replace, $r); + } + $this->escapeInText = array( + 'search' => $search, + 'replace' => $replace + ); + } + + /** + * parse a HTML string + * + * @param string $html + * @return string markdown formatted + */ + public function parseString($html) + { + $this->resetState(); + + $this->parser->html = $html; + $this->parse(); + + return $this->output; + } + + /** + * set the position where the link reference will be displayed + * + * @param int $linkPosition + * @return void + */ + public function setLinkPosition($linkPosition) + { + $this->linkPosition = $linkPosition; + } + + /** + * set keep HTML tags which cannot be converted to markdown + * + * @param bool $linkPosition + * @return void + */ + public function setKeepHTML($keepHTML) + { + $this->keepHTML = $keepHTML; + } + + /** + * iterate through the nodes and decide what we + * shall do with the current node + * + * @param void + * @return void + */ + protected function parse() + { + $this->output = ''; + // drop tags + $this->parser->html = preg_replace('#<(' . implode('|', $this->drop) . ')[^>]*>.*</\\1>#sU', '', $this->parser->html); + while ($this->parser->nextNode()) { + switch ($this->parser->nodeType) { + case 'doctype': + break; + case 'pi': + case 'comment': + if ($this->keepHTML) { + $this->flushLinebreaks(); + $this->out($this->parser->node); + $this->setLineBreaks(2); + } + // else drop + break; + case 'text': + $this->handleText(); + break; + case 'tag': + if (in_array($this->parser->tagName, $this->ignore)) { + break; + } + // If the previous tag was not a block element, we simulate a paragraph tag + if ($this->parser->isBlockElement && $this->parser->isNextToInlineContext && !in_array($this->parent(), $this->allowMixedChildren)) { + $this->setLineBreaks(2); + } + if ($this->parser->isStartTag) { + $this->flushLinebreaks(); + } + if ($this->skipConversion) { + $this->isMarkdownable(); // update notConverted + $this->handleTagToText(); + continue; + } + + // block elements + if (!$this->parser->keepWhitespace && $this->parser->isBlockElement) { + $this->fixBlockElementSpacing(); + } + + // inline elements + if (!$this->parser->keepWhitespace && $this->parser->isInlineContext) { + $this->fixInlineElementSpacing(); + } + + if ($this->isMarkdownable()) { + if ($this->parser->isBlockElement && $this->parser->isStartTag && !$this->lastWasBlockTag && !empty($this->output)) { + if (!empty($this->buffer)) { + $str =& $this->buffer[count($this->buffer) - 1]; + } else { + $str =& $this->output; + } + if (substr($str, -strlen($this->indent) - 1) != "\n" . $this->indent) { + $str .= "\n" . $this->indent; + } + } + $func = 'handleTag_' . $this->parser->tagName; + $this->$func(); + if ($this->linkPosition == self::LINK_AFTER_PARAGRAPH && $this->parser->isBlockElement && !$this->parser->isStartTag && empty($this->parser->openTags)) { + $this->flushFootnotes(); + } + if (!$this->parser->isStartTag) { + $this->lastClosedTag = $this->parser->tagName; + } + } else { + $this->handleTagToText(); + $this->lastClosedTag = ''; + } + break; + default: + trigger_error('invalid node type', E_USER_ERROR); + break; + } + $this->lastWasBlockTag = $this->parser->nodeType == 'tag' && $this->parser->isStartTag && $this->parser->isBlockElement; + } + if (!empty($this->buffer)) { + // trigger_error('buffer was not flushed, this is a bug. please report!', E_USER_WARNING); + while (!empty($this->buffer)) { + $this->out($this->unbuffer()); + } + } + // cleanup + $this->output = rtrim(str_replace('&', '&', str_replace('<', '<', str_replace('>', '>', $this->output)))); + // end parsing, flush stacked tags + $this->flushFootnotes(); + $this->stack = array(); + } + + /** + * check if current tag can be converted to Markdown + * + * @param void + * @return bool + */ + protected function isMarkdownable() + { + if (!isset($this->isMarkdownable[$this->parser->tagName])) { + // simply not markdownable + + return false; + } + if ($this->parser->isStartTag) { + $return = true; + if ($this->keepHTML) { + $diff = array_diff(array_keys($this->parser->tagAttributes), array_keys($this->isMarkdownable[$this->parser->tagName])); + if (!empty($diff)) { + // non markdownable attributes given + $return = false; + } + } + if ($return) { + foreach ($this->isMarkdownable[$this->parser->tagName] as $attr => $type) { + if ($type == 'required' && !isset($this->parser->tagAttributes[$attr])) { + // required markdown attribute not given + $return = false; + break; + } + } + } + if (!$return) { + array_push($this->notConverted, $this->parser->tagName . '::' . implode('/', $this->parser->openTags)); + } + + return $return; + } else { + if (!empty($this->notConverted) && end($this->notConverted) === $this->parser->tagName . '::' . implode('/', $this->parser->openTags)) { + array_pop($this->notConverted); + + return false; + } + + return true; + } + } + + /** + * output footnotes + * + * @param void + * @return void + */ + protected function flushFootnotes() + { + $out = false; + foreach ($this->footnotes as $k => $tag) { + if (!isset($tag['unstacked'])) { + if (!$out) { + $out = true; + $this->out("\n\n", true); + } else { + $this->out("\n", true); + } + $this->out(' [' . $tag['linkID'] . ']: ' . $this->getLinkReference($tag), true); + $tag['unstacked'] = true; + $this->footnotes[$k] = $tag; + } + } + } + + /** + * return formated link reference + * + * @param array $tag + * @return string link reference + */ + protected function getLinkReference($tag) + { + return $tag['href'] . (isset($tag['title']) ? ' "' . $tag['title'] . '"' : ''); + } + + /** + * flush enqued linebreaks + * + * @param void + * @return void + */ + protected function flushLinebreaks() + { + if ($this->lineBreaks && !empty($this->output)) { + $this->out(str_repeat("\n" . $this->indent, $this->lineBreaks), true); + } + $this->lineBreaks = 0; + } + + /** + * handle non Markdownable tags + * + * @param void + * @return void + */ + protected function handleTagToText() + { + if (!$this->keepHTML) { + if (!$this->parser->isStartTag && $this->parser->isBlockElement) { + $this->setLineBreaks(2); + } + } else { + // dont convert to markdown inside this tag + /** TODO: markdown extra **/ + if (!$this->parser->isEmptyTag) { + if ($this->parser->isStartTag) { + if (!$this->skipConversion) { + $this->skipConversion = $this->parser->tagName . '::' . implode('/', $this->parser->openTags); + } + } else { + if ($this->skipConversion == $this->parser->tagName . '::' . implode('/', $this->parser->openTags)) { + $this->skipConversion = false; + } + } + } + + if ($this->parser->isBlockElement) { + if ($this->parser->isStartTag) { + // looks like ins or del are block elements now + if (in_array($this->parent(), array('ins', 'del'))) { + $this->out("\n", true); + $this->indent(' '); + } + // don't indent inside <pre> tags + if ($this->parser->tagName == 'pre') { + $this->out($this->parser->node); + static $indent; + $indent = $this->indent; + $this->indent = ''; + } else { + $this->out($this->parser->node . "\n" . $this->indent); + if (!$this->parser->isEmptyTag) { + $this->indent(' '); + } else { + $this->setLineBreaks(1); + } + $this->parser->html = ltrim($this->parser->html); + } + } else { + if (!$this->parser->keepWhitespace) { + $this->output = rtrim($this->output); + } + if ($this->parser->tagName != 'pre') { + $this->indent(' '); + $this->out("\n" . $this->indent . $this->parser->node); + } else { + // reset indentation + $this->out($this->parser->node); + static $indent; + $this->indent = $indent; + } + + if (in_array($this->parent(), array('ins', 'del'))) { + // ins or del was block element + $this->out("\n"); + $this->indent(' '); + } + if ($this->parser->tagName == 'li') { + $this->setLineBreaks(1); + } else { + $this->setLineBreaks(2); + } + } + } else { + $this->out($this->parser->node); + } + if (in_array($this->parser->tagName, array('code', 'pre'))) { + if ($this->parser->isStartTag) { + $this->buffer(); + } else { + // add stuff so cleanup just reverses this + $this->out(str_replace('<', '&lt;', str_replace('>', '&gt;', $this->unbuffer()))); + } + } + } + } + + /** + * handle plain text + * + * @param void + * @return void + */ + protected function handleText() + { + if ($this->hasParent('pre') && strpos($this->parser->node, "\n") !== false) { + $this->parser->node = str_replace("\n", "\n" . $this->indent, $this->parser->node); + } + if (!$this->hasParent('code') && !$this->hasParent('pre')) { + // entity decode + $this->parser->node = $this->decode($this->parser->node); + if (!$this->skipConversion) { + // escape some chars in normal Text + $this->parser->node = preg_replace($this->escapeInText['search'], $this->escapeInText['replace'], $this->parser->node); + } + } else { + $this->parser->node = str_replace(array('"', '&apos'), array('"', '\''), $this->parser->node); + } + $this->out($this->parser->node); + $this->lastClosedTag = ''; + } + + /** + * handle <em> and <i> tags + * + * @param void + * @return void + */ + protected function handleTag_em() + { + $this->out('_', true); + } + + protected function handleTag_i() + { + $this->handleTag_em(); + } + + /** + * handle <strong> and <b> tags + * + * @param void + * @return void + */ + protected function handleTag_strong() + { + $this->out('**', true); + } + + protected function handleTag_b() + { + $this->handleTag_strong(); + } + + /** + * handle <h1> tags + * + * @param void + * @return void + */ + protected function handleTag_h1() + { + $this->handleHeader(1); + } + + /** + * handle <h2> tags + * + * @param void + * @return void + */ + protected function handleTag_h2() + { + $this->handleHeader(2); + } + + /** + * handle <h3> tags + * + * @param void + * @return void + */ + protected function handleTag_h3() + { + $this->handleHeader(3); + } + + /** + * handle <h4> tags + * + * @param void + * @return void + */ + protected function handleTag_h4() + { + $this->handleHeader(4); + } + + /** + * handle <h5> tags + * + * @param void + * @return void + */ + protected function handleTag_h5() + { + $this->handleHeader(5); + } + + /** + * handle <h6> tags + * + * @param void + * @return void + */ + protected function handleTag_h6() + { + $this->handleHeader(6); + } + + /** + * handle header tags (<h1> - <h6>) + * + * @param int $level 1-6 + * @return void + */ + protected function handleHeader($level) + { + if ($this->parser->isStartTag) { + $this->out(str_repeat('#', $level) . ' ', true); + } else { + $this->setLineBreaks(2); + } + } + + /** + * handle <p> tags + * + * @param void + * @return void + */ + protected function handleTag_p() + { + if (!$this->parser->isStartTag) { + $this->setLineBreaks(2); + } + } + + /** + * handle <a> tags + * + * @param void + * @return void + */ + protected function handleTag_a() + { + if ($this->parser->isStartTag) { + $this->buffer(); + $this->handleTag_a_parser(); + $this->stack(); + } else { + $tag = $this->unstack(); + $buffer = $this->unbuffer(); + $this->handleTag_a_converter($tag, $buffer); + $this->out($this->handleTag_a_converter($tag, $buffer), true); + } + } + + /** + * handle <a> tags parsing + * + * @param void + * @return void + */ + protected function handleTag_a_parser() + { + if (isset($this->parser->tagAttributes['title'])) { + $this->parser->tagAttributes['title'] = $this->decode($this->parser->tagAttributes['title']); + } else { + $this->parser->tagAttributes['title'] = null; + } + $this->parser->tagAttributes['href'] = $this->decode(trim($this->parser->tagAttributes['href'])); + } + + /** + * handle <a> tags conversion + * + * @param array $tag + * @param string $buffer + * @return string The markdownified link + */ + protected function handleTag_a_converter($tag, $buffer) + { + if (empty($tag['href']) && empty($tag['title'])) { + // empty links... testcase mania, who would possibly do anything like that?! + return '[' . $buffer . ']()'; + } + + if ($buffer == $tag['href'] && empty($tag['title'])) { + // <http://example.com> + return '<' . $buffer . '>'; + } + + $bufferDecoded = $this->decode(trim($buffer)); + if (substr($tag['href'], 0, 7) == 'mailto:' && 'mailto:' . $bufferDecoded == $tag['href']) { + if (is_null($tag['title'])) { + // <mail@example.com> + return '<' . $bufferDecoded . '>'; + } + // [mail@example.com][1] + // ... + // [1]: mailto:mail@example.com Title + $tag['href'] = 'mailto:' . $bufferDecoded; + } + + if ($this->linkPosition == self::LINK_IN_PARAGRAPH) { + return '[' . $buffer . '](' . $this->getLinkReference($tag) . ')'; + } + + // [This link][id] + foreach ($this->footnotes as $tag2) { + if ($tag2['href'] == $tag['href'] && $tag2['title'] === $tag['title']) { + $tag['linkID'] = $tag2['linkID']; + break; + } + } + if (!isset($tag['linkID'])) { + $tag['linkID'] = count($this->footnotes) + 1; + array_push($this->footnotes, $tag); + } + + return '[' . $buffer . '][' . $tag['linkID'] . ']'; + } + + /** + * handle <img /> tags + * + * @param void + * @return void + */ + protected function handleTag_img() + { + if (!$this->parser->isStartTag) { + return; // just to be sure this is really an empty tag... + } + + if (isset($this->parser->tagAttributes['title'])) { + $this->parser->tagAttributes['title'] = $this->decode($this->parser->tagAttributes['title']); + } else { + $this->parser->tagAttributes['title'] = null; + } + if (isset($this->parser->tagAttributes['alt'])) { + $this->parser->tagAttributes['alt'] = $this->decode($this->parser->tagAttributes['alt']); + } else { + $this->parser->tagAttributes['alt'] = null; + } + + if (empty($this->parser->tagAttributes['src'])) { + // support for "empty" images... dunno if this is really needed + // but there are some test cases which do that... + if (!empty($this->parser->tagAttributes['title'])) { + $this->parser->tagAttributes['title'] = ' ' . $this->parser->tagAttributes['title'] . ' '; + } + $this->out('![' . $this->parser->tagAttributes['alt'] . '](' . $this->parser->tagAttributes['title'] . ')', true); + + return; + } else { + $this->parser->tagAttributes['src'] = $this->decode($this->parser->tagAttributes['src']); + } + + $out = '![' . $this->parser->tagAttributes['alt'] . ']'; + if ($this->linkPosition == self::LINK_IN_PARAGRAPH) { + $out .= '(' . $this->parser->tagAttributes['src']; + if ($this->parser->tagAttributes['title']) { + $out .= ' "' . $this->parser->tagAttributes['title'] . '"'; + } + $out .= ')'; + $this->out($out, true); + return; + } + + // ![This image][id] + $link_id = false; + if (!empty($this->footnotes)) { + foreach ($this->footnotes as $tag) { + if ($tag['href'] == $this->parser->tagAttributes['src'] + && $tag['title'] === $this->parser->tagAttributes['title'] + ) { + $link_id = $tag['linkID']; + break; + } + } + } + if (!$link_id) { + $link_id = count($this->footnotes) + 1; + $tag = array( + 'href' => $this->parser->tagAttributes['src'], + 'linkID' => $link_id, + 'title' => $this->parser->tagAttributes['title'] + ); + array_push($this->footnotes, $tag); + } + $out .= '[' . $link_id . ']'; + + $this->out($out, true); + } + + /** + * handle <code> tags + * + * @param void + * @return void + */ + protected function handleTag_code() + { + if ($this->hasParent('pre')) { + // ignore code blocks inside <pre> + + return; + } + if ($this->parser->isStartTag) { + $this->buffer(); + } else { + $buffer = $this->unbuffer(); + // use as many backticks as needed + preg_match_all('#`+#', $buffer, $matches); + if (!empty($matches[0])) { + rsort($matches[0]); + + $ticks = '`'; + while (true) { + if (!in_array($ticks, $matches[0])) { + break; + } + $ticks .= '`'; + } + } else { + $ticks = '`'; + } + if ($buffer[0] == '`' || substr($buffer, -1) == '`') { + $buffer = ' ' . $buffer . ' '; + } + $this->out($ticks . $buffer . $ticks, true); + } + } + + /** + * handle <pre> tags + * + * @param void + * @return void + */ + protected function handleTag_pre() + { + if ($this->keepHTML && $this->parser->isStartTag) { + // check if a simple <code> follows + if (!preg_match('#^\s*<code\s*>#Us', $this->parser->html)) { + // this is no standard markdown code block + $this->handleTagToText(); + + return; + } + } + $this->indent(' '); + if (!$this->parser->isStartTag) { + $this->setLineBreaks(2); + } else { + $this->parser->html = ltrim($this->parser->html); + } + } + + /** + * handle <blockquote> tags + * + * @param void + * @return void + */ + protected function handleTag_blockquote() + { + $this->indent('> '); + } + + /** + * handle <ul> tags + * + * @param void + * @return void + */ + protected function handleTag_ul() + { + if ($this->parser->isStartTag) { + $this->stack(); + if (!$this->keepHTML && $this->lastClosedTag == $this->parser->tagName) { + $this->out("\n" . $this->indent . '<!-- -->' . "\n" . $this->indent . "\n" . $this->indent); + } + } else { + $this->unstack(); + if ($this->parent() != 'li' || preg_match('#^\s*(</li\s*>\s*<li\s*>\s*)?<(p|blockquote)\s*>#sU', $this->parser->html)) { + // dont make Markdown add unneeded paragraphs + $this->setLineBreaks(2); + } + } + } + + /** + * handle <ul> tags + * + * @param void + * @return void + */ + protected function handleTag_ol() + { + // same as above + $this->parser->tagAttributes['num'] = 0; + $this->handleTag_ul(); + } + + /** + * handle <li> tags + * + * @param void + * @return void + */ + protected function handleTag_li() + { + if ($this->parent() == 'ol') { + $parent =& $this->getStacked('ol'); + if ($this->parser->isStartTag) { + $parent['num']++; + $this->out(str_repeat(' ', 3 - strlen($parent['num'])) . $parent['num'] . '. ', true); + } + } else { + if ($this->parser->isStartTag) { + $this->out(' * ', true); + } + } + $this->indent(' ', false); + if (!$this->parser->isStartTag) { + $this->setLineBreaks(1); + } + } + + /** + * handle <hr /> tags + * + * @param void + * @return void + */ + protected function handleTag_hr() + { + if (!$this->parser->isStartTag) { + return; // just to be sure this really is an empty tag + } + $this->out('* * *', true); + $this->setLineBreaks(2); + } + + /** + * handle <br /> tags + * + * @param void + * @return void + */ + protected function handleTag_br() + { + $this->out(" \n" . $this->indent, true); + $this->parser->html = ltrim($this->parser->html); + } + + /** + * add current node to the stack + * this only stores the attributes + * + * @param void + * @return void + */ + protected function stack() + { + if (!isset($this->stack[$this->parser->tagName])) { + $this->stack[$this->parser->tagName] = array(); + } + array_push($this->stack[$this->parser->tagName], $this->parser->tagAttributes); + } + + /** + * remove current tag from stack + * + * @param void + * @return array + */ + protected function unstack() + { + if (!isset($this->stack[$this->parser->tagName]) || !is_array($this->stack[$this->parser->tagName])) { + trigger_error('Trying to unstack from empty stack. This must not happen.', E_USER_ERROR); + } + + return array_pop($this->stack[$this->parser->tagName]); + } + + /** + * get last stacked element of type $tagName + * + * @param string $tagName + * @return array + */ + protected function &getStacked($tagName) + { + // no end() so it can be referenced + return $this->stack[$tagName][count($this->stack[$tagName]) - 1]; + } + + /** + * set number of line breaks before next start tag + * + * @param int $number + * @return void + */ + protected function setLineBreaks($number) + { + if ($this->lineBreaks < $number) { + $this->lineBreaks = $number; + } + } + + /** + * buffer next parser output until unbuffer() is called + * + * @param void + * @return void + */ + protected function buffer() + { + array_push($this->buffer, ''); + } + + /** + * end current buffer and return buffered output + * + * @param void + * @return string + */ + protected function unbuffer() + { + return array_pop($this->buffer); + } + + /** + * append string to the correct var, either + * directly to $this->output or to the current + * buffers + * + * @param string $put + * @param boolean $nowrap + * @return void + */ + protected function out($put, $nowrap = false) + { + if (empty($put)) { + return; + } + if (!empty($this->buffer)) { + $this->buffer[count($this->buffer) - 1] .= $put; + } else { + if ($this->bodyWidth && !$this->parser->keepWhitespace) { // wrap lines + // get last line + $pos = strrpos($this->output, "\n"); + if ($pos === false) { + $line = $this->output; + } else { + $line = substr($this->output, $pos); + } + + if ($nowrap) { + if ($put[0] != "\n" && $this->strlen($line) + $this->strlen($put) > $this->bodyWidth) { + $this->output .= "\n" . $this->indent . $put; + } else { + $this->output .= $put; + } + + return; + } else { + $put .= "\n"; // make sure we get all lines in the while below + $lineLen = $this->strlen($line); + while ($pos = strpos($put, "\n")) { + $putLine = substr($put, 0, $pos + 1); + $put = substr($put, $pos + 1); + $putLen = $this->strlen($putLine); + if ($lineLen + $putLen < $this->bodyWidth) { + $this->output .= $putLine; + $lineLen = $putLen; + } else { + $split = preg_split('#^(.{0,' . ($this->bodyWidth - $lineLen) . '})\b#', $putLine, 2, PREG_SPLIT_OFFSET_CAPTURE | PREG_SPLIT_DELIM_CAPTURE); + $this->output .= rtrim($split[1][0]) . "\n" . $this->indent . $this->wordwrap(ltrim($split[2][0]), $this->bodyWidth, "\n" . $this->indent, false); + } + } + $this->output = substr($this->output, 0, -1); + + return; + } + } else { + $this->output .= $put; + } + } + } + + /** + * indent next output (start tag) or unindent (end tag) + * + * @param string $str indentation + * @param bool $output add indendation to output + * @return void + */ + protected function indent($str, $output = true) + { + if ($this->parser->isStartTag) { + $this->indent .= $str; + if ($output) { + $this->out($str, true); + } + } else { + $this->indent = substr($this->indent, 0, -strlen($str)); + } + } + + /** + * decode email addresses + * + * @author derernst@gmx.ch <http://www.php.net/manual/en/function.html-entity-decode.php#68536> + * @author Milian Wolff <http://milianw.de> + */ + protected function decode($text, $quote_style = ENT_QUOTES) + { + return htmlspecialchars_decode($text, $quote_style); + } + + /** + * callback for decode() which converts a hexadecimal entity to UTF-8 + * + * @param array $matches + * @return string UTF-8 encoded + */ + protected function _decode_hex($matches) + { + return $this->unichr(hexdec($matches[1])); + } + + /** + * callback for decode() which converts a numerical entity to UTF-8 + * + * @param array $matches + * @return string UTF-8 encoded + */ + protected function _decode_numeric($matches) + { + return $this->unichr($matches[1]); + } + + /** + * UTF-8 chr() which supports numeric entities + * + * @author grey - greywyvern - com <http://www.php.net/manual/en/function.chr.php#55978> + * @param array $matches + * @return string UTF-8 encoded + */ + protected function unichr($dec) + { + if ($dec < 128) { + $utf = chr($dec); + } elseif ($dec < 2048) { + $utf = chr(192 + (($dec - ($dec % 64)) / 64)); + $utf .= chr(128 + ($dec % 64)); + } else { + $utf = chr(224 + (($dec - ($dec % 4096)) / 4096)); + $utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64)); + $utf .= chr(128 + ($dec % 64)); + } + + return $utf; + } + + /** + * UTF-8 strlen() + * + * @param string $str + * @return int + * + * @author dtorop 932 at hotmail dot com <http://www.php.net/manual/en/function.strlen.php#37975> + * @author Milian Wolff <http://milianw.de> + */ + protected function strlen($str) + { + if (function_exists('mb_strlen')) { + return mb_strlen($str, 'UTF-8'); + } else { + return preg_match_all('/[\x00-\x7F\xC0-\xFD]/', $str, $var_empty); + } + } + + /** + * wordwrap for utf8 encoded strings + * + * @param string $str + * @param integer $len + * @param string $what + * @return string + */ + protected function wordwrap($str, $width, $break, $cut = false) + { + if (!$cut) { + $regexp = '#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){1,' . $width . '}\b#'; + } else { + $regexp = '#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){' . $width . '}#'; + } + $return = ''; + while (preg_match($regexp, $str, $matches)) { + $string = $matches[0]; + $str = ltrim(substr($str, strlen($string))); + if (!$cut && isset($str[0]) && in_array($str[0], array('.', '!', ';', ':', '?', ','))) { + $string .= $str[0]; + $str = ltrim(substr($str, 1)); + } + $return .= $string . $break; + } + + return $return . ltrim($str); + } + + /** + * check if current node has a $tagName as parent (somewhere, not only the direct parent) + * + * @param string $tagName + * @return bool + */ + protected function hasParent($tagName) + { + return in_array($tagName, $this->parser->openTags); + } + + /** + * get tagName of direct parent tag + * + * @param void + * @return string $tagName + */ + protected function parent() + { + return end($this->parser->openTags); + } + + /** + * Trims whitespace in block-level elements, on the left side. + */ + protected function fixBlockElementSpacing() + { + if ($this->parser->isStartTag) { + $this->parser->html = ltrim($this->parser->html); + } + } + + /** + * Moves leading/trailing whitespace from inline elements outside of the + * element. This is to fix cases like `<strong> Text</strong>`, which if + * converted to `** strong**` would be incorrect Markdown. + * + * Examples: + * + * * leading: `<strong> Text</strong>` becomes ` <strong>Text</strong>` + * * trailing: `<strong>Text </strong>` becomes `<strong>Text</strong> ` + */ + protected function fixInlineElementSpacing() + { + if ($this->parser->isStartTag) { + // move spaces after the start element to before the element + if (preg_match('~^(\s+)~', $this->parser->html, $matches)) { + $this->out($matches[1]); + $this->parser->html = ltrim($this->parser->html, " \t\0\x0B"); + } + } else { + if (!empty($this->buffer)) { + $str =& $this->buffer[count($this->buffer) - 1]; + } else { + $str =& $this->output; + } + + // move spaces before the end element to after the element + if (preg_match('~(\s+)$~', $str, $matches)) { + $str = rtrim($str, " \t\0\x0B"); + $this->parser->html = $matches[1] . $this->parser->html; + } + } + } + + /** + * Resetting the state forces the instance to behave as a fresh instance. + * Ideal for running within a loop where you want to maintain a single instance. + */ + protected function resetState() + { + $this->notConverted = array(); + $this->skipConversion = false; + $this->buffer = array(); + $this->indent = ''; + $this->stack = array(); + $this->lineBreaks = 0; + $this->lastClosedTag = ''; + $this->lastWasBlockTag = false; + $this->footnotes = array(); + } +} |