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/**
* The planize jQuery plugin adds some features for dealing with hierarchical headings in a given DOM element.
*
* - adds enumerations and anchors in all headings,
* - can generates an HTML table of content and append it to an existing DOM element,
* - in an unobstrusive way.
*
* Example of use:
*
* $('html *').planize();
*
* Configuration object parameters documentation:
* - add_anchors : generates anchors for each header (automatically set to true if `generate_toc` is set to true)
* - callback : a function called when processing is finished
* - debug : prints pretty debug messages into the firebug or opera console, if available
* - generate_toc : generates an html unordered list containing the table of content of the document
* - min_level : min heading level needed to be included in toc and be renumbered (0 = all headings)
* - max_level : max heading level needed to be included in toc and be renumbered (0 = all headings)
* - number_suffix : heading identifier suffix, eg. ')' in "1.2.3)"
* - number_separator : separator for numbers, eg. '.' in "1.2.3)"
* - toc_elem : the dom element where the toc will be append
* - toc_none : the message to display if no headings have been found in the current document
* - toc_title : the title of the table of content
*
* @requires jQuery v1.2 or higher
* @author Nicolas Perriault <nperriault _at_ gmail _dot_ com>
* @license MIT (http://www.opensource.org/licenses/mit-license.php)
* @param Object config Plugin configuration
* @return jQuery(this)
*
*/
(function(jQuery){
jQuery.fn.planize = function(config) {
var self = jQuery(this);
var processed = false;
var toc = '';
var defaultConfig = {
add_anchors : false,
callback : null,
debug : false,
generate_toc : false,
min_level : 1,
max_level : 6,
number_suffix : '',
number_separator : '.',
toc_elem : null,
toc_none : 'No heading found for this document',
toc_title : 'Table of contents'
};
config = jQuery.extend(defaultConfig, config);
/**
* Prepends all headers text with the current tree number reference
* @return void
*/
var process = function() {
var level = 0;
var levels = [0,0,0,0,0,0,0];
var hLevelText = '';
var prependText = '';
var prevLevel = 0;
var n = 0;
self.children('*:header:visible').each(function(index, heading) {
log('Processing heading %o', heading);
level = parseInt(heading.tagName.substring(1));
if (config.min_level <= level && level <= config.max_level) {
n++;
levels[level]++;
for (var l = 1; l <= level; l++) {
hLevelText += levels[l] > 0 ? levels[l] + config.number_separator : '';
}
levels[level + 1] = 0;
hLevelText = hLevelText.substring(0, hLevelText.length - 1);
prependText = hLevelText;
if (config.generate_toc || config.add_anchors) {
if (config.generate_toc) {
var link = '<a href="#h' + hLevelText + '">' +jQuery('<span/>').text(jQuery(this).text()).html() + '</a>';
var elem = "\n"+'<li>' + hLevelText + (config.number_suffix ? config.number_suffix : '') + ' ' + link;
if (level < prevLevel) {
log(hLevelText + ', unnesting because:' + level + '<' + prevLevel);
var unnest = '';
while (level < prevLevel) {
unnest += '</ul>';
prevLevel--;
}
toc += unnest + elem + '</li>';
} else if (level > prevLevel) {
log(hLevelText + ', nesting because:' + level + '>' + prevLevel);
toc += '<ul>' + elem;
} else {
log(hLevelText + ', same level (' + level + ')');
toc += elem;
}
}
prependText = '<span id="h' + hLevelText + '"></span>' + hLevelText;
}
if (config.number_suffix) {
prependText += config.number_suffix;
}
jQuery(this).prepend(prependText + ' ');
prependText = hLevelText = '';
prevLevel = level;
}
});
if (config.generate_toc) {
if (config.toc_title) {
toc = '<h4>' + config.toc_title + '</h4>' + toc;
}
if (n == 0) {
toc += config.toc_none ? '<p>' + config.toc_none + '</p>' : '';
}
jQuery(config.toc_elem ? config.toc_elem : 'body').append(toc);
}
processed = true;
};
/**
* Logs a message into the firebug or opera console if available
*
*/
var log = function() {
if (!config.debug) {
return;
}
try {
console.log.apply(console, arguments);
} catch(e) {
try {
opera.postError.apply(opera, arguments);
} catch(e){}
}
}
process();
if (config.callback) {
config.callback(config.toc_elem);
}
return jQuery(this);
};
})(jQuery);