// ==UserScript==
// @name Next/Previous Navigation
// @namespace http://www.tobez.org/download/greasemonkey/
// @description Next/Previous links one keypress away!
// @include *
// ==/UserScript==
/**
** $Id: next-prev-navigation.user.js,v 1.38 2006/05/11 19:28:29 tobez Exp $
**
** next-prev-navigation.user.js $Revision: 1.38 $
**
** ----------------------------------------------------------------------------
** "THE BEER-WARE LICENSE" (Revision 42)
** <tobez@tobez.org> wrote this file. As long as you retain this notice you
** can do whatever you want with this stuff. If we meet some day, and you think
** this stuff is worth it, you can buy me a beer in return. Anton Berezin
** ----------------------------------------------------------------------------
**
** The Next/Previous navigation script adds keyboard shortcuts for
** jumping around various paginated screens. Newspapers articles,
** search results and stuff like that come to mind.
** Just press right arrow to go to the next page, left
** arrow to go to the previous page.
**
** The ultimate goal is to support as many variants of "next" and
** "previous" buttons as possible, so if you encounter a page for
** which it does not work, please drop me a mail with the link.
**
** I would like to thank Flemming Jacobsen for the idea of the script.
**
** This is a greasemonkey script, intended for use with the Firefox extension
** Greasemonkey.
** More info about Greasemonkey: http://greasemonkey.mozdev.org/
**
** More info about my Greasemonkey scripts:
** http://www.tobez.org/download/greasemonkey/
**
**/
(function()
{
var NODE_TEXT = 3;
var NODE_ELEMENT = 1;
var kb_arrow_left = 37;
var kb_arrow_right = 39;
var img_attrs = { src: 1, alt: 1, title: 1 };
var input_focus = 0;
/*
Urls that don't work but should:
http://www.jesusandmo.net/2005/12/07/xmas/
Urls that work and should stay working (for the forthcoming test suit):
http://www.metku.net/index.html?sect=view&n=0&path=mods/spire2/index_eng
http://foto.signout.dk/20051226/IMG_4034.JPG?width=640
http://www.markfiore.com/animation/flamey.html
*/
function empty(t)
{
return t == null || t == "" || t.match(/^\s*$/);
}
function get_text_content(n)
{
var s = "";
var children = n.childNodes;
for(var i = 0; i < children.length; i++) {
var c = children[i];
if (c.nodeType == NODE_TEXT)
s += c.data;
else
s += get_text_content(c);
}
return s;
}
function get_image_info(n)
{
var children = n.childNodes;
var t = new Array();
for(var i = 0; i < children.length; i++) {
var c = children[i];
if (c.nodeType == NODE_ELEMENT && /img/i.test(c.nodeName)) {
for (var attr in img_attrs) {
var txt = c.getAttribute(attr) || "";
if (!empty(txt)) t.push(txt);
}
}
}
return t;
}
function go_to_link(a)
{
try {
var click = a.getAttribute("onclick");
if (click)
eval(click); // XXX dangerous? yes/no
} finally {
window.location.href = a.getAttribute("href");
}
}
function get_link_info(a)
{
var t = new Array();
var txt = get_text_content(a);
if (!empty(txt)) t.push(txt);
txt = a.getAttribute("title") || "";
if (!empty(txt)) t.push(txt);
t = t.concat(get_image_info(a));
txt = a.getAttribute("class") || "";
if (!empty(txt)) t.push(txt);
return t;
}
function try_by_url(increment)
{
var loc = window.location.href;
/* Handle likes of "page007.html" */
var m = loc.match(/(0*)(\d+)(\.html?)\b/);
if (m && m.length) {
window.location.href = loc.replace(/(0*)(\d+)\.html?\b/, m[1]+(parseInt(m[2])+increment)+m[3]);
return;
}
/* Handle likes of something/2006/02/10/index.html */
m = loc.match(/\/(\d{2,4})\/(\d\d)\/(\d\d)\//);
if (m && m.length) {
var year = parseInt(m[1],10);
var full_year = year;
if (full_year < 100) {
full_year += 1900;
if (full_year < 1970)
full_year += 100;
}
var month = parseInt(m[2],10);
var day = parseInt(m[3],10);
if (month >= 1 && month <= 12 && day >= 1 && day <= 31) {
var d = new Date();
d.setFullYear(year, month-1, day);
d.setDate(d.getDate()+increment);
full_year = d.getFullYear();
if (year < 100) {
full_year = full_year - 1900;
if (full_year >= 100)
full_year -= 100;
if (full_year < 10)
full_year = "0" + full_year;
}
month = d.getMonth() + 1;
if (month < 10)
month = "0" + month;
day = d.getDate();
if (day < 10)
day = "0" + day;
window.location.href = loc.replace(/\/(\d{2,4})\/(\d\d)\/(\d\d)\//, "/" + full_year + "/" + month + "/" + day + "/");
return;
}
}
}
function try_previous()
{
try_something(
"prev",
[/^\s*\[?(\S+\s+)?(prev(ious)?|vorige|zurück|zurück|forrige)(\s+page(\s+-.*)|\s+\d+\s+\w+|:\s+.*)?(\s+\S+)?\]?\s*$/i,
/\/?\S*prev(ious)?(-\w+)?\d*(button)?\.(gif|png|jpg)\s*$/i,
/older\s+(version|revision)$/i,
/^\s*(«|<<|<<|«|«|<+-+)(\s*\S+)?((\s+-)?\s+(prev|image).*)?\s*$/i,
/\/?\S*(back|left)([-_]\w*)?\d*(button)?\.(gif|png|jpg)\s*$/i,
/^\s*back\s*$/i,
], -1);
}
function try_next()
{
try_something(
"next",
[/^\s*\[?(next|vorwärts|vorwärts|nächste|nächste|næste|næste|more results)(\s+page(\s+-.*)|\s+\d+\s+\w+|:\s+.*)?(\s+\S+)?(\]|\s*(>|>))?\s*$/i,
/\/?\S*next(-\w+)?\d*(button)?\.(gif|png|jpg)\s*$/i,
/^newer\s+(version|revision)/i,
/^\s*(\S+(\s+\S+)?\s*)?(»|>>|>>|»|»|-+>+)((\s+-)?\s+(image|img).*)?\s*$/i,
/\/?\S*(forth|right)([-_]\w*)?\d*(button)?\.(gif|png|jpg)\s*$/i,
], 1);
}
function try_rel_link(rel_type)
{
var l = document.getElementsByTagName("link");
for (var i = 0; i < l.length; i++) {
if (l[i].getAttribute("rel") == rel_type && l[i].getAttribute("href")) {
go_to_link(l[i]);
return true;
}
}
return false;
}
function try_something(rel_type, re, incr)
{
if (try_rel_link(rel_type))
return;
var anchors = document.getElementsByTagName("a");
var links = new Array();
for (var i = 0; i < anchors.length; i++) {
var a = anchors[i];
var t = get_link_info(a);
// if (window.location.href.match(/testsite/)) {
// for (var j = 0; j < t.length; j++) {
// alert(t[j]);
// }
// }
for (var j = 0; j < t.length; j++) {
for (var k = 0; k < re.length; k++) {
if (t[j].match(re[k])) {
// alert("match: " + t[j] + " with " + re[k].toString());
links.push({rank: k, link: a});
}
}
}
}
var rank = 9999;
var link;
for (var i = 0; i < links.length; i++) {
if (links[i].rank < rank) {
rank = links[i].rank;
link = links[i].link;
}
}
if (link)
go_to_link(link);
else
try_by_url(incr);
}
function key_handler(e)
{
if (input_focus == 0) {
if (e.keyCode == kb_arrow_left) {
try_previous();
} else if (e.keyCode == kb_arrow_right) {
try_next();
}
}
}
function attach()
{
document.addEventListener("keydown", key_handler, false);
["input","select","textarea"].forEach(function (type) {
var els = document.getElementsByTagName(type);
for (var i = 0; i < els.length; i++) {
els[i].addEventListener("focus", function () { input_focus = 1; }, false);
els[i].addEventListener("blur", function () { input_focus = 0; }, false);
};
});
}
attach();
})();
