/**
* Divides a wiki page content in 3 parts to allow a proper section
* viewing/editing. We need the name of the section and the number
* to allow sections with same name.
*
* The parts are:
* 1. prev_part: the text previous to the section
* 2. current_part: the text of the section
* 3. next_part: the text after the section
*
* @param String $text Wiki page text
* @param String $section Name of the section to cut
* @param String $sectionnum Number of the section to cut
* @param String $check 'nocheck' implies a weaker section validation
* @return Array $res Array composed of 3 parts
*/
function wiki_split_sections($text, $section, $sectionnum)
{
global $WS;
$res->prev_part = '';
$res->current_part = $text;
$res->next_part = '';
$res->error = '';
// param checking
if ($text == '') {
return $res;
}
$res->current_part = '';
$prev_part = '';
$next_part = '';
$current_depth = -1;
$matched_section = false;
$num_sections = 0;
// analyze the text to divide the section in the 3 parts
$lines = explode("\n", $text);
$numlines = 0;
foreach ($lines as $current_line) {
$numlines++;
if (!isset($current_part)) {
// we haven't found the section yet
$current_depth = wiki_get_section_depth($current_line, $section);
if (wiki_get_section_depth($current_line, '(.*)+') > 0) {
$num_sections++;
}
if ($current_depth > 0) {
// probably section found
if ($num_sections == $sectionnum) {
// if it's really the one we want
$current_part = $current_line . "\n";
$matched_depth = $current_depth;
$matched_section = true;
} else {
// it's a section with the same name but not the one we want
$prev_part .= $current_line . "\n";
}
} else {
// section not found, so it's text previous to it
$prev_part .= $current_line . "\n";
}
} else {
$new_depth = wiki_get_section_depth($current_line, '(.*)+');
if ($new_depth > 0) {
$num_sections++;
$current_depth = $new_depth;
if ($current_depth <= $matched_depth) {
$matched_section = false;
}
}
if ($matched_section) {
// belongs to the section
$current_part .= $current_line . "\n";
} else {
// doesn't belong to the section, so it's after
$next_part .= $current_line . "\n";
}
}
}
// could find the section content ?
if (!isset($current_part)) {
$urls = wiki_view_page_url($WS->page, $section, 0, '');
$res->error = get_string('sectionerror', 'wiki', $section) . '. ' . get_string('sectionchanged', 'wiki') . ': ' . '<a href="' . $urls[0] . '">' . $WS->page . '</a>';
return $res;
}
// construct and return the result
$res->prev_part = $prev_part;
$res->current_part = $current_part . "\n";
$res->next_part = $next_part;
return $res;
}
function parse_internal_link($matches)
{
global $WS, $CFG, $COURSE;
// allow spaces before and after the internal link name
$matches[1] = trim($matches[1]);
$matches[1] = wiki_clean_name($matches[1]);
$parts = explode('|', $matches[1]);
$target = $parts[0];
$label = $target;
if (count($parts) > 1) {
$label = $parts[1];
}
// internal links to sections
$page = $target;
$anchor = '';
$anchortype = 0;
$pos = strpos($target, '#');
if ($pos > 0) {
$page = substr($target, 0, $pos);
if (substr($target, $pos + 1, 1) == "#") {
// [[page##section]]: partial view of the section
$anchortype = 2;
$anchor = substr($target, $pos + 2, strlen($target) - $pos);
} else {
// [[page#section]]: page view plus scroll to section
$anchortype = 1;
$anchor = substr($target, $pos + 1, strlen($target) - $pos);
}
}
// wikibook
$wikibookname = '';
if (count($parts) > 2 && preg_match("/^wikibook:(.*)/", $parts[2], $match)) {
$wikibookname = $match[1];
}
$wikibookparam = '';
if ($wikibookname) {
$wikibookparam = '&wikibook=' . urlencode($wikibookname);
}
// we can have more than one section with the same name, so we link
// to all of them in a list after the link.
$res = '';
$urls = wiki_view_page_url($page, $anchor, $anchortype, $wikibookname);
$num_urls = count($urls);
for ($i = 0; $i < $num_urls; $i++) {
if ($i == 0) {
// we render the first matched section as a normal link
$res = '<a href="' . $urls[$i] . '">' . $label . '</a>';
} elseif ($i == 1) {
$res .= ' [<a href="' . $urls[$i] . '">' . ($i + 1) . '</a>';
} else {
$res .= ', <a href="' . $urls[$i] . '">' . ($i + 1) . '</a>';
}
if ($i == $num_urls - 1 && $i > 0) {
$res .= ']';
}
}
if (!wiki_page_exists($WS, $page, true)) {
$res = '<span class="nwikiwanted">' . $res . '</span>';
} else {
if ($anchor != '') {
if (!wiki_section_exists($page, $anchor)) {
$res = '<span class="nwikiwanted">' . $res . '</span>';
}
}
}
return $res;
}
