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[EDIT] FILE: slides.js

// S5 v1.1 slides.js -- released into the Public Domain
// Modified for Docutils (https://docutils.sourceforge.io) by David Goodger
//
// Please see http://www.meyerweb.com/eric/tools/s5/credits.html for
// information about all the wonderful and talented contributors to this code!

var undef;
var slideCSS = '';
var snum = 0;
var smax = 1;
var slideIDs = new Array();
var incpos = 0;
var number = undef;
var s5mode = true;
var defaultView = 'slideshow';
var controlVis = 'visible';

var isIE = navigator.appName == 'Microsoft Internet Explorer' ? 1 : 0;
var isOp = navigator.userAgent.indexOf('Opera') > -1 ? 1 : 0;
var isGe = navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('Safari') < 1 ? 1 : 0;

function hasClass(object, className) {
	if (!object.className) return false;
	return (object.className.search('(^|\\s)' + className + '(\\s|$)') != -1);
}

function hasValue(object, value) {
	if (!object) return false;
	return (object.search('(^|\\s)' + value + '(\\s|$)') != -1);
}

function removeClass(object,className) {
	if (!object) return;
	object.className = object.className.replace(new RegExp('(^|\\s)'+className+'(\\s|$)'), RegExp.$1+RegExp.$2);
}

function addClass(object,className) {
	if (!object || hasClass(object, className)) return;
	if (object.className) {
		object.className += ' '+className;
	} else {
		object.className = className;
	}
}

function isParentOrSelf(element, id) {
	if (element == null || element.nodeName=='BODY') return false;
	else if (element.id == id) return true;
	else return isParentOrSelf(element.parentNode, id);
}

function slideLabel() {
	var slideColl = GetElementsWithClassName('*','slide');
	var list = document.getElementById('jumplist');
	smax = slideColl.length;
	for (var n = 0; n < smax; n++) {
		var obj = slideColl[n];

var did = 'slide' + n.toString();
		if (obj.getAttribute('id')) {
			slideIDs[n] = obj.getAttribute('id');
		}
		else {
			obj.setAttribute('id',did);
			slideIDs[n] = did;
		}
		if (isOp) continue;

var otext = '';
		var menu = obj.firstChild;
		if (!menu) continue; // to cope with empty slides
		while (menu && menu.nodeType == 3) {
			menu = menu.nextSibling;
		}
	 	if (!menu) continue; // to cope with slides with only text nodes

var menunodes = menu.childNodes;
		for (var o = 0; o < menunodes.length; o++) {
			otext += nodeValue(menunodes[o]);
		}
		list.options[list.length] = new Option(n + ' : '  + otext, n);
	}
}

function goTo(target) {
	if (target >= smax || target == snum) return;
	go(target - snum);
}

// 'keys' code adapted from MozPoint (http://mozpoint.mozdev.org/)
function keys(key) {
	if (!key) {
		key = event;
		key.which = key.keyCode;
	}
	if (key.which == 84) {
		toggle();
		return;
	}
	if (s5mode) {
		switch (key.which) {
			case 10: // return
			case 13: // enter
				if (window.event && isParentOrSelf(window.event.srcElement, 'controls')) return;
				if (key.target && isParentOrSelf(key.target, 'controls')) return;
				if(number != undef) {
					goTo(number);
					break;
				}
			case 32: // spacebar
			case 34: // page down
			case 39: // rightkey
			case 40: // downkey
				if(number != undef) {
					go(number);
				} else if (!incrementals[snum] || incpos >= incrementals[snum].length) {
					go(1);
				} else {
					subgo(1);
				}
				break;
			case 33: // page up
			case 37: // leftkey
			case 38: // upkey
				if(number != undef) {
					go(-1 * number);
				} else if (!incrementals[snum] || incpos <= 0) {
					go(-1);
				} else {
					subgo(-1);
				}
				break;
			case 36: // home
				goTo(0);
				break;
			case 35: // end
				goTo(smax-1);
				break;
			case 67: // c
				showHide('k');
				break;
		}
		if (key.which < 48 || key.which > 57) {
			number = undef;
		} else {
			if (window.event && isParentOrSelf(window.event.srcElement, 'controls')) return;
			if (key.target && isParentOrSelf(key.target, 'controls')) return;
			number = (((number != undef) ? number : 0) * 10) + (key.which - 48);
		}
	}
	return false;
}

function findSlide(hash) {
	var target = document.getElementById(hash);
	if (target) {
		for (var i = 0; i < slideIDs.length; i++) {
			if (target.id == slideIDs[i]) return i;
		}
	}
	return null;
}

function createIncrementals() {
	var incrementals = new Array();
	for (var i = 0; i < smax; i++) {
		incrementals[i] = getIncrementals(document.getElementById(slideIDs[i]));
	}
	return incrementals;
}

// Key trap fix, new function body for trap()
function trap(e) {
	if (!e) {
		e = event;
		e.which = e.keyCode;
	}
	try {
		modifierKey = e.ctrlKey || e.altKey || e.metaKey;
	}
	catch(e) {
		modifierKey = false;
	}
	return modifierKey || e.which == 0;
}

window.onload = startup;
window.onresize = function(){setTimeout('fontScale()', 50);}

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