// ==UserScript==
// @name         AutoTOC
// @namespace    http://runeskaug.com/greasemonkey
// @description  Automatically creates a table of contents for all HTML-headers on a web page.
// @author       Rune Skaug ([email protected]), IzzySoft
// @license      CC BY (https://creativecommons.org/licenses/by/2.5/)
// @include      http://*
// @include      https://*
// @version      1.9.2
// @grant        GM_registerMenuCommand
// @grant        GM.registerMenuCommand
// @grant        GM_addStyle
// @grant        GM.addStyle
// @homepageURL  https://codeberg.org/izzy/userscripts
// @require      https://greasemonkey.github.io/gm4-polyfill/gm4-polyfill.js
// @run-at       document-idle
// ==/UserScript==
(function() {
// text constants
var fullTOCText = "Table of Contents";
var hideBtnText = "\u00a0X\u00a0";
var RXmatch = /^h[1-4]$/i; // regexp
var XPmatch = "//h1|//h2|//h3|//h4"; // xpath
//set the optional behaviour of the TOC box
// if true, resets it to its initial state after you have selected a header - false does not reset it
var resetSelect = true;
// if true, shows a "Hide TOC"/close button on the left side of the bar
var showHide = true;
// if true, hides the TOC for all pages on current site
var useCookie = true;
// if true, adds menu item (Toggle TOC)
var addMenuItem = true;
// to check whether loading CSS is blocked by CSP
var cssLoaded = false;
// CSS definition
cssJsToc = 'position: fixed; left: 0; right: 0; top: auto; bottom: 0; width: 100%; display: block; border-top: 1px solid #777; background: #ddd; margin: 0; padding: 3px; z-index: 9999;';
cssSelect = 'font: 8pt verdana, sans-serif; margin: 0; margin-left:5px; background: #fff; color: #000; float: left; padding: 0; vertical-align: bottom;';
cssOption = 'font: 8pt verdana, sans-serif; color: #000;';
cssHideBtn = 'font: bold 8pt verdana, sans-serif !important; float: left; margin-left: 2px; margin-right: 2px; padding: 1px; border: 1px solid #999; background: #e7e7e7;';
cssHideLink = 'color: #333; text-decoration: none; background: transparent;} #js-toc .hideBtn a:hover { color: #333; text-decoration: none; background: transparent;';
function f() {
//only on (X)HTML pages containing at least one heading - excludes XML files, text files, plugins and images (displayed using minimal HTML)
if (document.getElementsByTagName("html").length && ( document.getElementsByTagName('h1').length ||
document.getElementsByTagName('h2').length ||
document.getElementsByTagName('h3').length ||
document.getElementsByTagName('h4').length )
&& (!useCookie || (useCookie && getCookie('autotoc_hide')!='true'))) {
var aHs = getHTMLHeadings();
if (aHs.length>1) { // HTML document, more than one heading.
var body = document.getElementsByTagName('body')[0];
body.style.marginBottom = "24px !important";
GM_addStyle('@media print { #js-toc {display: none; visibility: hidden; }}\n'+
'@media screen { #js-toc { '+cssJsToc+' }\n'+
'#js-toc-dummy { display:none; }\n'+
'#js-toc select { '+cssSelect+' }\n'+
'#js-toc option { '+cssOption+' }\n'+
'#js-toc .hideBtn { '+cssHideBtn+' }\n'+
'#js-toc .hideBtn a { '+cssHideLink+' }\n'+
'#js-toc:not(:hover) { height: 2px !important; width: 5px !important; border-radius: 5px !important; background-color: #00f !important; }'
);
// check whether our CSS was loaded:
var dummy = document.createElement('span');
dummy.id = 'js-toc-dummy';
document.body.appendChild(dummy);
if ( getComputedStyle(document.getElementById('js-toc-dummy')).display == 'none' ) { cssLoaded = true; }
dummy.parentNode.removeChild(dummy);
// Browser sniff++ - due to rendering bug(s) in FF1.0
var toc = document.createElement(window.opera||showHide?'tocdiv':'div');
toc.id = 'js-toc';
if (showHide) {
var hideDiv = document.createElement('div');
hideDiv.setAttribute('class','hideBtn');
var hideLink = document.createElement('a');
hideLink.setAttribute("href","#");
hideLink.addEventListener("click",function(){if(useCookie){document.getElementById('js-toc').style.display='none';document.cookie='autotoc_hide=true; path=/';return false;}else{document.getElementById('js-toc').style.display='none';}});
hideLink.appendChild(document.createTextNode(hideBtnText));
if ( !cssLoaded ) hideLink.style = cssHideLink;
hideDiv.appendChild(hideLink);
if ( !cssLoaded ) hideDiv.style = cssHideBtn;
toc.appendChild(hideDiv);
}
tocSelect = document.createElement('select');
tocSelect.addEventListener("change", function(){gotoAnchor(this)});
tocSelect.id = 'toc-select';
tocEmptyOption = document.createElement('option');
tocEmptyOption.setAttribute('value','');
tocEmptyOption.appendChild(document.createTextNode(fullTOCText));
if ( !cssLoaded ) tocEmptyOption.style = cssOption;
tocSelect.appendChild(tocEmptyOption);
if ( !cssLoaded ) tocSelect.style = cssSelect;
toc.appendChild(tocSelect);
if ( !cssLoaded ) toc.style = cssJsToc;
document.body.appendChild(toc);
for (var i=0,aH;aH=aHs[i];i++) {
if (aH.offsetWidth) {
op  = document.createElement("option");
op.appendChild(document.createTextNode(gs(aH.tagName)+getInnerText(aH).substring(0,100)));
var refID = aH.id ? aH.id : aH.tagName+'-'+(i*1+1);
op.setAttribute("value", refID);
if ( !cssLoaded ) op.style = cssOption;
document.getElementById("toc-select").appendChild(op);
aH.id = refID;
}
}
}
}
};
function autoTOC_toggleDisplay() {
if (document.getElementById('js-toc')) {
// toc-bar exists
if (document.getElementById('js-toc').style.display == 'none') {
document.getElementById('js-toc').style.display = 'block';
if (useCookie) {document.cookie = 'autotoc_hide=; path=/';}
}
else {
document.getElementById('js-toc').style.display = 'none';
if (useCookie) {document.cookie = 'autotoc_hide=true; path=/';}
};
} else {
// toc-bar not created yet, clear hide-cookie and run main script
if (useCookie) {document.cookie = 'autotoc_hide=; path=/';}
f();
}
}
function flash(el,rep,delay) {
for (var i=rep;i>0;i--) {
window.setTimeout(function(){el.style.background="#ff7";},delay*i*2);
window.setTimeout(function(){el.style.background=elbg;},delay*((i*2)+1));
}
}
function gotoAnchor(selectEl) {
if(selectEl) {
el = document.getElementById(selectEl.value);
elbg = el.style.background;
location.href = '#' + selectEl.value;
flash(el,5,100);
if ( resetSelect ) { selectEl.selectedIndex = 0; }
}
}
function getHTMLHeadings() {
function acceptNode(node) {
if (node.tagName.match(RXmatch)) { if (node.value+''!='') { return NodeFilter.FILTER_ACCEPT; } }
return NodeFilter.FILTER_SKIP;
}
outArray = new Array();
// XPath
if (document.evaluate) {
var nodes = document.evaluate(XPmatch, document, null, XPathR###lt.ANY_TYPE, null);
var thisHeading = nodes.iterateNext();
var j = 0;
while (thisHeading) {
if (thisHeading.textContent+''!='') {
outArray[j++] = thisHeading;
}
thisHeading = nodes.iterateNext();
}
}
// document.getElementsByTagName - slow! :)
else {
var els = document.getElementsByTagName("*");
var j = 0;
for (var i=0,el;el=els[i];i++) {
if (el.tagName.match(RXmatch)) outArray[j++] = el;
}
}
return outArray;
}
function gs(s){
s = s.toLowerCase();
var ret = "";
for (var i=1; i<(s.substring(1)*1);i++) {
ret = ret + "\u00a0 \u00a0 ";
}
return ret;
}
function getInnerText(el) {
var s='';
for (var i=0,node; node=el.childNodes[i]; i++) {
if (node.nodeType == 1) s += getInnerText(node);
else if (node.nodeType == 3) s += node.nodeValue;
}
return s;
}
function getCookie(cname)
{
var namesep = cname + "=";
var ca = document.cookie.split(';');
for(var i=0, c; c=ca[i]; i++)
{
c = c.replace(/^\s*|\s*$/g,"");
if (c.indexOf(namesep) == 0) {
return c.substring(namesep.length,c.length);
}
}
return null;
}
// main()
if (!window.opera && addMenuItem) {
GM.registerMenuCommand('AutoTOC: Toggle display', autoTOC_toggleDisplay);
}
f();
})();