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codeutils.js
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codeutils.js
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window.applyLineWrapping = function(enabled) {
var s = document.getElementById('linewrapping');
if (!s) {
s = document.createElement('style');
s.setAttribute('id', 'linewrapping');
(document.head || document.body).appendChild(s);
}
s.textContent = enabled ? 'pre { white-space: pre-wrap }' : '';
};
window.scrollToHighlight = function() {
if (!window.highlightTop || !window.highlightBottom || !window.innerHeight) {
return;
}
var highlightHeight = window.highlightBottom - window.highlightTop;
var scrollTarget = window.highlightTop;
if (highlightHeight < window.innerHeight) {
// center highlighted area in window
var offset = (window.innerHeight - highlightHeight) / 2;
scrollTarget -= offset;
}
window.scrollTo(0, scrollTarget);
// make sure to only do this once
window.highlightTop = 0;
window.highlightBottom = 0;
};
window.highlightLines = function(from, to) {
if (from < 0) {
return;
}
var pre = document.getElementById("content");
var ol = pre != null ? pre.getElementsByTagName("ol")[0] : null;
var lines = ol != null ? ol.getElementsByTagName("li") : null;
if (lines != null && lines.length >= from && (to < 0 || lines.length >= to)) {
var first = from - 1;
var last = (to < 0 ? from : to) - 1;
for (i = first; i <= last; i++) {
lines[i].className += " highlighted";
}
var top = 0, bottom = lines[last].offsetHeight;
for (elem = lines[first]; elem != null; elem = elem.offsetParent) {
top += elem.offsetTop;
}
for (elem = lines[last]; elem != null; elem = elem.offsetParent) {
bottom += elem.offsetTop;
}
window.highlightTop = top;
window.highlightBottom = bottom;
window.scrollToHighlight();
}
};