Lets you click footnotes in Earth Policy Institute's "Plan B" series of books to bring them to your eyes, rather than have you chase down the page to the reference, and back again afterward. Hypertext!
// ==UserScript==
// @name Plan B: inline footnotes
// @namespace http://github.com/johan/
// @description Lets you click footnotes in Earth Policy Institute's "Plan B" series of books to bring them to your eyes, rather than have you chase down the page to the reference, and back again afterward. Hypertext!
// @include http://earth-policy.org/index.php?/books/pb*
// @include http://www.earth-policy.org/index.php?/books/pb*
// @version 0.0.1.20140419225641
// ==/UserScript==
$x('//p/text()').filter(is_footnote).forEach(link_footnote);
function is_footnote(node) {
return /^\s*\d+\.\D/.test(node.nodeValue || "");
}
function link_footnote(text) {
function inline(e) {
e.preventDefault(); // don't go there this time -- just inline the footnote
link.removeEventListener("click", inline, true); // but do, next time
inject_footnote(no, link);
}
var no = text.nodeValue.match(/^\s*(\d+)\.\s*(.*)/), lead;
if (no) {
lead = no[2];
no = parseInt(no[1], 10);
}
else
return;
var refs = $x('preceding::text()[contains(.,"'+ no +'")]', text), ref, tail;
while ((ref = refs.pop())) {
if ((tail = ref.nodeValue.match("^(|.*\\D)"+ no + "\\s*$")))
break;
}
if (tail) {
tail = tail[1];
} else
return; // no link found in prior text
// content to footnote
var link = A(no, "n-back", "n", ref.nextSibling, ref.parentNode);
link.addEventListener("click", inline, true);
ref.nodeValue = tail;
var anchor = A(no, "n", "n-back", text); // footnote to content
text.nodeValue = " " + lead;
}
function inject_footnote(no, at, ibid) {
var tail = at.lastChild; // "]"
if (!ibid) at.insertBefore(document.createTextNode("] "), tail);
var note = $X('id("f'+ no +'n")'), first = true;
while (note) {
note = note.nextSibling;
if ($X('self::br | .//br', note)) break;
var text = first && note.nodeName == "#text" && note.nodeValue, copy;
if (text && (text = text.match(/^\s*ibid\.?(.*)/i))) {
inject_footnote(no - 1, at, "ibidem"); // keep recursing back
if (ibid) return; // and don't bother continuing when not found
copy = document.createTextNode(text[1]); // but proceed otherwise -- see
// http://www.earth-policy.org/index.php?/books/pb4/PB4ch1_ss5#f58n-back
} else {
copy = note.cloneNode(true);
}
at.insertBefore(copy, tail);
}
}
function A(text, name, href, before, parent) {
var span = document.createElement("span");
span.style.color = "#999";
span.textContent = "[";
var a = document.createElement("a");
a.style.color = "#274980";
a.textContent = text;
span.id = 'f' + text + name;
a.href = '#f' + text + href;
span.appendChild(a);
span.appendChild(document.createTextNode("]"));
(parent || before.parentNode).insertBefore(span, before);
// focus this one, if we've hotlinked to the anchor
if (location.hash === "#" + span.id) {
location.hash = "#";
location.hash += span.id;
}
return span;
}
function $X( xpath, root ) {
var got = $x( xpath, root );
return got instanceof Array ? got[0] : got;
}
function $x( xpath, root ) {
var doc = root ? root.evaluate ? root : root.ownerDocument : document;
var got = doc.evaluate( xpath, root||doc, null, 0, null ), next, result = [];
switch (got.resultType) {
case got.STRING_TYPE:
return got.stringValue;
case got.NUMBER_TYPE:
return got.numberValue;
case got.BOOLEAN_TYPE:
return got.booleanValue;
default:
while ((next = got.iterateNext()))
result.push( next );
return result;
}
}