<?php
if (IN_serendipity !== true) {
die ("Don't hack!");
}
@serendipity_plugin_api::load_language(dirname(__FILE__));
class serendipity_event_nl2br extends serendipity_event
{
var $title = PLUGIN_EVENT_NL2BR_NAME;
function introspect(&$propbag)
{
global $serendipity;
$propbag->add('name', PLUGIN_EVENT_NL2BR_NAME);
$propbag->add('description', PLUGIN_EVENT_NL2BR_DESC);
$propbag->add('stackable', false);
$propbag->add('author', 'Serendipity Team');
$propbag->add('version', '2.21.2');
$propbag->add('requirements', array(
'serendipity' => '1.6',
'smarty' => '2.6.7',
'php' => '4.1.0'
));
$propbag->add('cachable_events', array('frontend_display' => true));
$propbag->add('event_hooks', array('frontend_display' => true,
'backend_configure' => true,
'css' => true
));
$propbag->add('groups', array('MARKUP'));
$this->markup_elements = array(
array(
'name' => 'ENTRY_BODY',
'element' => 'body',
),
array(
'name' => 'EXTENDED_BODY',
'element' => 'extended',
),
array(
'name' => 'COMMENT',
'element' => 'comment',
),
array(
'name' => 'HTML_NUGGET',
'element' => 'html_nugget',
)
);
$conf_array = array('check_markup', 'isolate', 'p_tags', 'isobr', 'clean_tags');
foreach($this->markup_elements as $element) {
$conf_array[] = $element['name'];
}
$propbag->add('configuration', $conf_array);
}
function cleanup()
{
global $serendipity;
/* check possible config mismatch setting in combination with ISOBR */
if ( serendipity_db_bool($this->get_config('isobr')) === true ) {
if( serendipity_db_bool($this->get_config('clean_tags')) === true ) {
$this->set_config('clean_tags', false);
echo '<div class="serendipityAdminMsgError msg_error"><img class="backend_attention" src="' . $serendipity['serendipityHTTPPath'] . 'templates/default/admin/img/admin_msg_note.png" alt="" />';
echo sprintf(PLUGIN_EVENT_NL2BR_CONFIG_ERROR, 'clean_tags', 'ISOBR') . '</div>';
return false;
}
if ( serendipity_db_bool($this->get_config('p_tags')) === true ) {
$this->set_config('p_tags', false);
echo '<div class="serendipityAdminMsgError msg_error"><img class="backend_attention" src="' . $serendipity['serendipityHTTPPath'] . 'templates/default/admin/img/admin_msg_note.png" alt="" />';
echo sprintf(PLUGIN_EVENT_NL2BR_CONFIG_ERROR, 'p_tags', 'ISOBR') . '</div>';
return false;
}
}
/* check possible config mismatch setting in combination with P_TAGS */
if ( serendipity_db_bool($this->get_config('p_tags')) === true && serendipity_db_bool($this->get_config('clean_tags')) === true ) {
$this->set_config('clean_tags', false);
echo '<div class="serendipityAdminMsgError msg_error"><img class="backend_attention" src="' . $serendipity['serendipityHTTPPath'] . 'templates/default/admin/img/admin_msg_note.png" alt="" />';
echo sprintf(PLUGIN_EVENT_NL2BR_CONFIG_ERROR, 'clean_tags', 'P_TAGS') . '</div>';
return false;
}
return true;
}
function example()
{
return '<h3>PLEASE NOTE the implications of this markup plugin:</h3>
<p>This plugin transfers linebreaks to HTML-linebreaks, so that they show up in your blog entry.</p>
<p>In two cases this can raise problematic issues for you:</p>
<ul>
<li>if you use a <strong>WYSIWYG editor</strong> to write your entries. In that case, the WYSIWYG editor already inserts proper HTML linebreaks, so the nl2br plugin would actually double those linebreaks.</li>
<li>if you use any other markup plugins in conjunction with this plugin that already translate linebreaks. The <strong>TEXTILE and MARKDOWN plugins</strong> are examples for plugins like these.</li>
</ul>
<p>To prevent problems, you should disable the nl2br plugin on entries globally or per entry within the "Extended properties" section of an entry, if you have the entryproperties plugin installed.</p>
<p>Generally advice: The nl2br plugin only makes sense if you</p>
<ul>
<li>A) do not use other markup plugins or</li>
<li>B) you do not use the WYSIWYG editor or</li>
<li>C) you only want to apply linebreak transformations on comments to your blog entries, and do not allow any possible markup of other plugins that you only use for blog entries.</li>
</ul>'."\n";
}
function install()
{
serendipity_plugin_api::hook_event('backend_cache_entries', $this->title);
}
function uninstall(&$propbag)
{
serendipity_plugin_api::hook_event('backend_cache_purge', $this->title);
serendipity_plugin_api::hook_event('backend_cache_entries', $this->title);
}
function generate_content(&$title)
{
$title = $this->title;
}
function introspect_config_item($name, &$propbag)
{
switch($name) {
case 'check_markup':
$propbag->add('type', 'boolean');
$propbag->add('name', PLUGIN_EVENT_NL2BR_CHECK_MARKUP);
$propbag->add('description', PLUGIN_EVENT_NL2BR_CHECK_MARKUP_DESC);
$propbag->add('default', 'true');
break;
case 'isolate':
$propbag->add('type', 'string');
$propbag->add('name', PLUGIN_EVENT_NL2BR_ISOLATE_TAGS);
$propbag->add('description', PLUGIN_EVENT_NL2BR_ISOLATE_TAGS_DESC);
$propbag->add('default', '');
break;
case 'p_tags':
$propbag->add('type', 'boolean');
$propbag->add('name', PLUGIN_EVENT_NL2BR_PTAGS);
$propbag->add('description', PLUGIN_EVENT_NL2BR_PTAGS_DESC);
$propbag->add('default', 'false');
break;
case 'isobr':
$propbag->add('type', 'boolean');
$propbag->add('name', PLUGIN_EVENT_NL2BR_ISOBR_TAG);
$propbag->add('description', PLUGIN_EVENT_NL2BR_ISOBR_TAG_DESC);
$propbag->add('default', 'true');
break;
case 'clean_tags':
$propbag->add('type', 'boolean');
$propbag->add('name', PLUGIN_EVENT_NL2BR_CLEANTAGS);
$propbag->add('description', PLUGIN_EVENT_NL2BR_CLEANTAGS_DESC);
$propbag->add('default', 'false');
break;
default:
$propbag->add('type', 'boolean');
$propbag->add('name', constant($name));
$propbag->add('description', sprintf(APPLY_MARKUP_TO, constant($name)));
$propbag->add('default', 'true');
break;
}
return true;
}
function isolate($src, $regexp = NULL)
{
if($regexp) return preg_replace_callback($regexp, array($this, 'isolate'), $src);
global $_buf;
$_buf[] = $src[0];
return "\001" . (count($_buf) - 1);
}
function restore_callback($matches)
{
global $_buf;
return $_buf[$matches[1]];
}
function restore($text)
{
return preg_replace_callback('!\001(\d+)!', array($this, 'restore_callback'), $text); // works?!
}
function event_hook($event, &$bag, &$eventData, $addData = null)
{
global $serendipity;
static $markup = null;
static $isolate = null;
static $p_tags = null;
static $isobr = null;
static $clean_tags = null;
global $_buf;
$hooks = &$bag->get('event_hooks');
if ($markup === null) {
$markup = serendipity_db_bool($this->get_config('check_markup'));
}
if ($p_tags === null) {
$p_tags = serendipity_db_bool($this->get_config('p_tags'));
}
if ($isobr === null) {
$isobr = serendipity_db_bool($this->get_config('isobr'));
}
if ($clean_tags === null) {
$clean_tags = serendipity_db_bool($this->get_config('clean_tags'));
}
if (isset($hooks[$event])) {
switch($event) {
case 'frontend_display':
// check single entry for temporary disabled markups
if ( !$eventData['properties']['ep_disable_markup_' . $this->instance] &&
@!in_array($this->instance, $serendipity['POST']['properties']['disable_markups']) &&
!$eventData['properties']['ep_no_textile'] && !isset($serendipity['POST']['properties']['ep_no_textile']) &&
!$eventData['properties']['ep_no_markdown'] && !isset($serendipity['POST']['properties']['ep_no_markdown'])) {
// yes, this markup shall be applied
$serendipity['nl2br']['entry_disabled_markup'] = false;
} else {
// no, do not apply markup
$serendipity['nl2br']['entry_disabled_markup'] = true;
}
/* PLEASE NOTE:
$serendipity['POST']['properties']['disable_markups'] = array(false); is the only workable solution for (sidebar?) plugins (see sidebar plugins: guestbook, multilingual), to explicitly allow to apply nl2br to markup (if we want to)
*/
// don't run, if the textile, or markdown plugin already took care about markup
if ($markup && $serendipity['nl2br']['entry_disabled_markup'] === false && (class_exists('serendipity_event_textile') || class_exists('serendipity_event_markdown'))) {
break;
}
// NOTE: the wysiwyg-editor needs to send its own ['properties']['ep_no_nl2br'] to disable the nl2br() parser!
// check for users isolation tags
if ($isolate === null) {
$isolate = $this->get_config('isolate');
$tags = (array)explode(',', $isolate);
$isolate = array();
foreach($tags AS $tag) {
$tag = trim($tag);
if (!empty($tag)) {
$isolate[] = $tag;
}
}
if (count($isolate) < 1) {
$isolate = false;
}
}
foreach ($this->markup_elements as $temp) {
if (serendipity_db_bool($this->get_config($temp['name'], true)) && isset($eventData[$temp['element']]) &&
!$eventData['properties']['ep_disable_markup_' . $this->instance] &&
@!in_array($this->instance, $serendipity['POST']['properties']['disable_markups']) &&
!$eventData['properties']['ep_no_nl2br'] &&
!isset($serendipity['POST']['properties']['ep_no_nl2br'])) {
$element = $temp['element'];
if ($p_tags) {
// NL2P OPERATION
$this->isolationtags = $isolate;
$text = $eventData[$element];
if (!empty($text)) {
//Standardize line endings to Unix
$text = str_replace(array("\r\n", "\r"), "\n", $text);
//framing newlines: pre and after everything
//without newline margin = 0 between body and extended
//to make splitting inside a paragraph possible
//but with obligatory break because of the independent div-elements
// rules for body <-> extended:
// no margins only if body ends with \n or no \n and extended starts without \n
// means: concatenate body and extended and there is no whiteline between them
if ($element == 'body' && isset($eventData['extended']) && !(strspn($text,"\n",-1) > 1) && strspn($eventData['extended'],"\n") )
{
$text = "\n" . $text;
}
elseif ($element == 'extended' && !strspn($text,"\n") && !(strspn($eventData['body'],"\n",-1) > 1))
{
$text = $text . "\n";
}
else
{
$text = "\n" . $text . "\n";
}
$eventData[$element] = $this->nl2p($text);
}
// NL2BR OPERATION
} else if ($isolate) {
$eventData[$element] = $this->isolate($eventData[$element], '~[<\[](' . implode('|', $isolate) . ').*?[>\]].*?[<\[]/\1[>\]]~si');
$eventData[$element] = nl2br($eventData[$element]);
$eventData[$element] = $this->restore($eventData[$element]);
} else {
if($isobr) {
$eventData[$element] = $this->isolate($eventData[$element], '~[<\[](nl).*?[>\]].*?[<\[]/\1[>\]]~si');
$eventData[$element] = nl2br($eventData[$element]);
$eventData[$element] = $this->restore($eventData[$element]);
// unset nl tagline, if is
$eventData[$element] = str_replace(array("<nl>", "</nl><br />", "</nl><br/>", "</nl>"), "", $eventData[$element]);
} else {
$eventData[$element] = nl2br($eventData[$element]);
}
}
/* this is an option if not using new isobr default config setting */
if (!$p_tags && $isobr === false && $clean_tags === true) {
// convert line endings to Unix style, if not already done
$eventData[$element] = str_replace(array("\r\n", "\r"), "\n", $eventData[$element]);
// clean special tags from nl2br
$eventData[$element] = $this->clean_nl2brtags($eventData[$element]);
}
}
}
break;
case 'backend_configure':
// check single entry for temporary disabled markups
if( $isobr ) {
$serendipity['nl2br']['iso2br'] = true; // include to global as also used by staticpages now
if (!is_object($serendipity['smarty'])) {
serendipity_smarty_init(); // if not set to avoid member function assign() on a non-object error, start Smarty templating
}
// hook into default/admin/entries.tpl somehow via the Heart Of Gold = serendipity_printEntryForm() before! it is loaded
$serendipity['smarty']->assign('iso2br', true);
}
break;
case 'css':
$eventData .= '
/* nl2br plugin start */
p.wl_nobottom {
margin-bottom: 0em;
}
p.wl_notop {
margin-top: 0em;
}
p.wl_notopbottom {
margin-top: 0em;
margin-bottom: 0em;
}
/* nl2br plugin end */
';
break;
default:
return false;
}
return true;
} else {
return false;
}
}
/**
* clean nl2br from markup where it is invalid and/or breaks html output
* @param string entrytext
* @return string
*/
function clean_nl2brtags(&$entry)
{
$allTags = explode('|', 'table|thead|tbody|tfoot|th|tr|td|caption|colgroup|col|ol|ul|li|dl|dt|dd');
$br2nl = array();
foreach($allTags as $tag){
/* for \\1 ( start with : < followed by any number of white spaces : \s* optionally a slash : /? and the tag itself )
* for \\2 ( anything with spaces and characters following until )
* for \\3 ( finally the > )
* for \\4 ( <br followed by any number of spaces, the optional slash and ending with > )
* regex modifier : i - using a case-insensitive match, as upper <TAGS> are valid in HTML
* regex modifier : s - using the dot metacharacter in the pattern to match all characters, including newlines */
$br2nl[] = "%(<\s*/?$tag)(.*?)([^>]*>)(<br\s*/?>)%is";
}
if(sizeof($br2nl)) $entry = preg_replace($br2nl, '\\1\\2\\3', $entry);
return $entry;
}
/** ====================================
* NL2P OPERATION
* ====================================
*/
// following w3.org, these elements close p elements automatically:
var $block_elements = array('table',
'h1', 'h2', 'h3', 'h4', 'h5', 'h6',
'menu', 'section',
'address', 'article', 'aside', 'fieldset', 'footer',
'form', 'header', 'hgroup', 'hr', 'main', 'nav', 'p'
);
var $nested_block_elements = array('div','table','blockquote','ul','ol','dl');
var $singleton_block_elements = array('hr');
var $isolation_block_elements = array('pre','textarea');
var $isolation_inline_elements = array('svg','style');
var $ignored_elements = array('area', 'br', 'col', 'command', 'embed',
'img', 'input', 'keygen', 'link', 'param', 'source',
'track', 'wbr', '!--', 'iframe',
'li','tr','th','col','colgroup',
'thead', 'tbody', 'tfoot', 'caption', 'ins','del',
'video','audio','title','desc','path','circle',
'ellipse', 'rect', 'line', 'polyline', 'polygon', 'text',
'image', 'g', 'defs'); //includes svg tags
//paragraphs aren't allowed in these inline elements -> p closes these elements:
var $inline_elements = array('b', 'big', 'i', 'small', 'tt', 'abbr',
'acronym', 'cite', 'code', 'dfn', 'em', 'kbd', 'strong',
'samp', 'var', 'a', 'bdo', 'bdi', 'map', 'object',
'q', 'script', 'span', 'sub', 'sup', 'button',
'label', 'select', 'textarea', 's', 'strike'
);
var $allowed_p_parents = array('blockquote', 'td', 'div', 'article', 'aside', 'dd',
'details', 'dl', 'dt', 'footer', 'header', 'summary'
);
const P_END = '</p>';
const P = '<p>';
const P_NOTOP = '<p class="wl_notop">';
const P_NOBOTTOM = '<p class="wl_nobottom">';
const P_NOTOPBOTTOM = '<p class="wl_notopbottom">';
function nl2p($text)
{
//homogenize tags
$text = $this->tag_clean($text);
//delete isolation tags from other arrays
if ($this->isolationtags)
{
$this->block_elements = array_diff($this->block_elements,$this->isolationtags);
$this->allowed_p_parents = array_diff($this->allowed_p_parents,$this->isolationtags);
$this->nested_block_elements = array_diff($this->nested_block_elements,$this->isolationtags);
$this->inline_elements = array_diff($this->inline_elements,$this->isolationtags);
$this->singleton_block_elements = array_diff($this->singleton_block_elements,$this->isolationtags);
$this->ignored_elements = array_diff($this->ignored_elements,$this->isolationtags);
$this->isolation_block_elements = array_diff($this->isolation_block_elements,$this->isolationtags);
}
if (empty($text)) { return ''; }
return $this->blocktag_nl2p($text);
}
/** Make sure that all the tags are in lowercase
* purge all \n from inside tags
* remove spaces in endtags
* replace < > with < $gt; for non-tags
* tags are split in three parts:
* tagstart - '<' character
* tagdef - type of tag like 'img'
* style - following content after a space
* isolation by quotes in the style part
* @param string text
* @return text
*/
function tag_clean($textstring)
{
$text = str_split($textstring);
$tagstart = false;
$tagstart_b = false;
$tagdef = false;
$endtag = false;
$tagstyle = false;
$singlequote = false;
$doublequote = false;
for ($i = 0; $i < count($text); $i++)
{
// start tag without closing tag
if ($text[$i] == '<' && !strpos($textstring,'>',$i+1) )
{ $text[$i] = '<'; }
// end tag without previous start, definition or style section
elseif ($text[$i] == '>' && !($tagstart !== false || $tagdef || $tagstyle) )
{ $text[$i] = '>'; }
// start tag inside quotes
elseif ( $text[$i] == '<' && ($singlequote || $doublequote) )
{ $text[$i] = '<'; }
// end tag inside quotes
elseif ( $text[$i] == '>' && ($singlequote || $doublequote) )
{ $text[$i] = '>'; }
// start tag inside tag
elseif ($text[$i] == '<' && $tagstart !== false )
{ $text[$i] = '<'; }
// real start tag
elseif ($text[$i] == '<' )
{ $tagstart = $i; }
// space after the start - not allowed in html
elseif ($text[$i] == ' ' && $tagstart !== false )
{
$text[$tagstart] = '<';
$tagstart = false;
}
// < > without content
elseif ($text[$i] == '>' && $tagstart !== false )
{
$text[$tagstart] = '<';
$text[$i] = '>';
}
// first space or closing tag in definition part
elseif ( ($text[$i] == ' ' || $text[$i] == '>') && $tagdef)
{
//check if it is a real tag
$tag = substr($textstring,$tagdef,$i-$tagdef);
if ( !(in_array($tag,$this->block_elements)
|| in_array($tag,$this->singleton_block_elements)
|| in_array($tag,$this->inline_elements)
|| in_array($tag,$this->allowed_p_parents)
|| in_array($tag,$this->isolation_block_elements)
|| in_array($tag,$this->isolation_inline_elements)
|| in_array($tag,$this->nested_block_elements)
|| in_array($tag,$this->ignored_elements)
|| in_array($tag,$this->isolationtags) ) )
{
// unknown tag definition
$text[$tagstart_b] = '<';
$tagstart = false;
$tagdef = false;
if ( $text[$i] == '>' ) { $text[$i] = '>'; }
} else
{
//convert to lowercase
for ($j = $tagdef; $j <= $i; $j++)
{
$text[$j] = strtolower($text[$j]);
}
$tagdef = false;
// closing >
if ($text[$i] == '>')
{
$tagstart = false;
$tagstyle = false;
$endtag = false;
}
// start of style part
else
{
$tagstyle = true;
}
}
}
// endtag starting with </
elseif ($text[$i] == '/' && $tagstart !== false)
{ $endtag = true; }
// space is allowed in endtag like </ i>
elseif ($text[$i] == ' ' && $endtag)
{ $text[$i] = ''; }
// remove newline in tags
elseif (($tagstart !== false || $tagdef || $tagstyle) && $text[$i] == "\n")
{ $text[$i] = ''; }
// closing > after style part
elseif ($text[$i] == '>' && $tagstyle && !($singlequote || $doublequote) )
{
$tagstart = false;
$tagdef = false;
$tagstyle = false;
$endtag = false;
}
// first definition character after <
elseif ($tagstart !== false && !($tagdef || $tagstyle) )
{
$tagdef = $i;
$tagstart_b = $tagstart;
$tagstart = false;
}
// quotes in style - isolate
elseif ($tagstyle && $text[$i] == '\'' && !$doublequote )
{
if ($singlequote)
{ $singlequote = false; }
else
{ $singlequote = true; }
}
elseif ($tagstyle && $text[$i] == '"' && !$singlequote )
{
if ($doublequote)
{ $doublequote = false; }
else
{ $doublequote = true; }
}
}
return implode($text);
}
/*
* sophisticated nl to p - blocktag stage
* handles content with blocktags, apply nl2p to the block elements if tag allows it
* works also for ommitted closing tags
* @param: text
* return string
*/
function blocktag_nl2p($text)
{
//explode string into array of tags and contents
$textarray = $this->explode_along_tags($text);
$content = "";
$start = 0;
$tagstack = array();
$isolation_flag = false;
if (! is_array($textarray)) {
return $text;
}
for ($i=0; $i < count($textarray); $i++)
{
//get tag or false if none
$tag = $this->extract_tag($textarray[$i]);
//new blocktag - e.g. <table>
if ($tag && $this->is_starttag($textarray[$i])
&& (in_array($tag, $this->block_elements) || in_array($tag, $this->nested_block_elements) ))
{
//merge previous content, apply nl2p if needed and concatenate
if (!$isolation_flag && ( empty($tagstack) || in_array($tagstack[0], $this->allowed_p_parents) ))
{
$content .= $this->nl2pblock(implode(array_slice($textarray,$start,$i-$start))) . "\n";
} else
{
$content .= implode(array_slice($textarray,$start,$i-$start));
}
// clear stack of block elements and insert
if (in_array($tag, $this->block_elements) )
{
$tagstack = array_diff($tagstack, $this->block_elements);
}
// concatenate tag
$content .= $textarray[$i];
if (!in_array($tag, $this->singleton_block_elements) )
{
array_unshift($tagstack, $tag);
}
$start = $i+1;
}
//new tag which can contain paragraphs and can be inside a blocktag - e.g. <td>
elseif ($tag && $this->is_starttag($textarray[$i]) && in_array($tag, $this->allowed_p_parents))
{
//merge previous content, apply nl2p if needed and concatenate
if (!$isolation_flag && ( empty($tagstack) || in_array($tagstack[0], $this->allowed_p_parents) ))
{
$content .= $this->nl2pblock(implode(array_slice($textarray,$start,$i-$start))) . "\n";
} else
{
$content .= implode(array_slice($textarray,$start,$i-$start));
}
//insert tag into the stack and concatenate
array_unshift($tagstack, $tag);
$content .= $textarray[$i];
$start = $i+1;
}
//isolation tag
elseif($tag && !$isolation_flag && $this->is_starttag($textarray[$i])
&& (in_array($tag, $this->isolation_block_elements) || in_array($tag, $this->isolationtags) ) )
{
//merge previous content, apply nl2p if needed and concatenate
if (empty($tagstack) )
{
$content .= $this->nl2pblock(implode(array_slice($textarray,$start,$i-$start))) . "\n";
} elseif (in_array($tagstack[0], $this->allowed_p_parents) )
{
$content .= $textarray[$start]
. $this->nl2pblock(implode(array_slice($textarray,$start+1,$i-$start-1))) . "\n";
} else
{
$content .= implode(array_slice($textarray,$start,$i-$start));
}
// concatenate tag if it's standard html
if (in_array($tag, $this->isolation_block_elements) )
{
$content .= $textarray[$i];
}
$isolation_flag = $tag; //isolation has to be started and ended with the same tag
$start = $i+1;
}
//closing isolation tag
elseif($tag && !$this->is_starttag($textarray[$i]) && $tag == $isolation_flag )
{
//content, no nl2p
$content .= implode(array_slice($textarray,$start,$i-$start));
$isolation_flag = false;
$start = $i+1;
// concatenate closing tag if it's standard html
if (in_array($tag, $this->isolation_block_elements) )
{
$content .= $textarray[$i];
}
}
//closing blocktag or p parent - e.g. </table> or </td>
elseif($tag && !$this->is_starttag($textarray[$i]) && !empty($tagstack) && $tag == $tagstack[0])
{
//content, apply nl2p if needed
if ($i != $start)
{
if (!$isolation_flag && in_array($tagstack[0], $this->allowed_p_parents) )
{
$content .= $this->nl2pblock(implode(array_slice($textarray,$start,$i-$start))) . "\n";
} else
{
$content .= implode(array_slice($textarray,$start,$i-$start));
}
}
//closing tag
$content .= $textarray[$i];
$start = $i+1;
array_shift($tagstack);
}
}
//merge remainder
if (!$isolation_flag && ( empty($tagstack) || in_array($tagstack[0], $this->allowed_p_parents) ))
{
$content .= $this->nl2pblock(implode(array_slice($textarray,$start,$i-$start))) . "\n";
} else
{
$content .= implode(array_slice($textarray,$start,$i-$start));
}
return $content;
}
/*
* sophisticated nl to p for content which is already
* purged from block elements by blocktag_nl2p
* explode content along tags
* build stack of active tags
* isolate content inside isolation tags or
* explode along newlines
* single breaks converted to <br>
* build every paragraph: p class | reopen active tags | content ... | new open tags | closing p tag
* class depends on framing newlines:
* Insert P_NOBOTTOM class at last paragraph if no newline is following
* Insert P_NOTOP class at the first paragraph if is not starting with a nl
* Insert P_NOTOPBOTTOM class if it is just one paragraph
* normal P for everything else (default CSS has margin top,bottom)
* @param string text
* @return string
*/
function nl2pblock($textstring)
{
//check for empty content
if (empty(trim($textstring))) { return $textstring; }
//check for start/end newlines
$startnl = ( strspn($textstring,"\n") ) ? true : false;
$endnl = ( strspn($textstring,"\n",-1 ) ) ? true : false;
$firstp = true;
$textstring = trim($textstring,"\n");
if (empty($textstring)) { return ''; }
$tagexplode = array();
//explode in tags and content
$tagexplode = $this->explode_along_tags($textstring);
$tagstack = array();
$textline = array();
$buffer = '';
$bufferhastext = false;
$content = '';
$tag = false;
$isolation_tag = false;
//first stage: explode in tags
for($i=0; $i<count($tagexplode);$i++)
{
//get tag or false if none
$tag = $this->extract_tag($tagexplode[$i]);
// start isolation
if ($tag && $this->is_starttag($tagexplode[$i]) && in_array($tag,$this->isolation_inline_elements))
{
$isolation_tag = $tag;
}
// end isolation
elseif ($tag && !$this->is_starttag($tagexplode[$i]) && $tag == $isolation_tag)
{
$isolation_tag = false;
}
// put inlinetag to stack
elseif ($tag && !$isolation_tag && $this->is_starttag($tagexplode[$i]) && in_array($tag,$this->inline_elements) )
{
array_unshift($tagstack, $tagexplode[$i]);
}
// remove inlinetag from stack
elseif ($tag && !$isolation_tag && !$this->is_starttag($tagexplode[$i]) && !empty($tagstack) && $tag == $this->extract_tag($tagstack[0]))
{
array_shift($tagstack);
}
// put isolated content into buffer
if ($isolation_tag || $tag)
{
$buffer .= $tagexplode[$i];
}
// explode content in textlines
else
{
$textline = explode("\n",$tagexplode[$i]);
//iterate through the paragraphs and build content
for ($j=0; $j<count($textline); $j++)
{
// whiteline \n\n found: make paragraph with buffer and this line
if ( ($j < count($textline) - 1 && empty($textline[$j+1]) ) )
{
// p start tag, append buffer and empty buffer
if ($firstp && !$startnl) { $content .= self::P_NOTOP . $buffer; }
else { $content .= self::P . $buffer; }
$firstp = false;
$buffer = '';
$bufferhastext = false;
//append textline
$content .= $textline[$j];
//close open tags
foreach($tagstack as $ins_tag) { $content .= $this->html_end_tag($this->extract_tag($ins_tag)); }
//paragraph closing tag
$content .= self::P_END . "\n";
//put closed tags into buffer
foreach($tagstack as $ins_tag) { $buffer .= $ins_tag; }
//skip newline
$j += 1;
}
elseif ($j < count($textline) - 1) // single break
{
$buffer .= $textline[$j] . "<br>\n";
$bufferhastext = true;
}
else // last line
{
// append textline
$buffer .= $textline[$j];
$bufferhastext = true;
}
}
}
}
// handle last paragraph
if (!$bufferhastext) { $content .= $buffer; }
else
{
if ($firstp && !$startnl && !$endnl ) { $content .= self::P_NOTOPBOTTOM; }
elseif ($firstp && !$startnl) { $content .= self::P_NOTOP; }
elseif (!$endnl) { $content .= self::P_NOBOTTOM; }
else { $content .= self::P; }
$content .= $buffer;
foreach($tagstack as $ins_tag) { $content .= $this->html_end_tag($this->extract_tag($ins_tag)); }
$content .= self::P_END;
}
return $content;
}
/** explode textstring into array of substrings
* array element can be tag or content
* @param text
* $return array of tags and contents
*/
function explode_along_tags($text)
{
$startpos = 0;
$endpos = 0;
$textarray = array();
do
{
//find tag start
$endpos = strpos($text,'<',$startpos);
if ($endpos === false)
{
//no more tags, copy remainder to array
$endpos = strlen($text);
if ($endpos - $startpos > 0)
{ $textarray[] = substr($text,$startpos,$endpos - $startpos); }
return $textarray;
}
elseif (($endpos - $startpos) > 0)
{
//copy preliminary text to array
$textarray[] = substr($text,$startpos,$endpos - $startpos);
}
$startpos = $endpos;
//find tag end
$endpos = strpos($text,'>',$startpos);
if ($endpos === false) { return false; }
elseif (($endpos - $startpos) > 1)
{
//copy tag to array
$textarray[] = substr($text,$startpos,$endpos - $startpos + 1);
$startpos = $endpos + 1;
}
else { return false; }
} while (1);
return false;
}
function extract_tag($text)
{
if ($text[0] != '<') { return false; }
$n = strcspn($text,' >');
return ltrim(substr($text,0,$n),'</');
}
function html_end_tag($text) { return '</' . $text . '>'; }
function html_start_tag($text) { return '<' . $text . '>'; }
function is_starttag($text) { return ($text[1] == "/") ? false : true; }
}
/* vim: set sts=4 ts=4 expandtab : */
?>