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// Haddock JavaScript utilities
function toggle(button,id)
{
var n = document.getElementById(id).style;
if (n.display == "none")
{
button.src = "minus.gif";
n.display = "block";
}
else
{
button.src = "plus.gif";
n.display = "none";
}
}
var max_results = 75; // 50 is not enough to search for map in the base libraries
var shown_range = null;
var last_search = null;
function quick_search()
{
perform_search(false);
}
function full_search()
{
perform_search(true);
}
function perform_search(full)
{
var text = document.getElementById("searchbox").value.toLowerCase();
if (text == last_search && !full) return;
last_search = text;
var table = document.getElementById("indexlist");
var status = document.getElementById("searchmsg");
var children = table.firstChild.childNodes;
// first figure out the first node with the prefix
var first = bisect(-1);
var last = (first == -1 ? -1 : bisect(1));
if (first == -1)
{
table.className = "";
status.innerHTML = "No results found, displaying all";
}
else if (first == 0 && last == children.length - 1)
{
table.className = "";
status.innerHTML = "";
}
else if (last - first >= max_results && !full)
{
table.className = "";
status.innerHTML = "More than " + max_results + ", press Search to display";
}
else
{
// decide what you need to clear/show
if (shown_range)
setclass(shown_range[0], shown_range[1], "indexrow");
setclass(first, last, "indexshow");
shown_range = [first, last];
table.className = "indexsearch";
status.innerHTML = "";
}
function setclass(first, last, status)
{
for (var i = first; i <= last; i++)
{
children[i].className = status;
}
}
// do a binary search, treating 0 as ...
// return either -1 (no 0's found) or location of most far match
function bisect(dir)
{
var first = 0, finish = children.length - 1;
var mid, success = false;
while (finish - first > 3)
{
mid = Math.floor((finish + first) / 2);
var i = checkitem(mid);
if (i == 0) i = dir;
if (i == -1)
finish = mid;
else
first = mid;
}
var a = (dir == 1 ? first : finish);
var b = (dir == 1 ? finish : first);
for (var i = b; i != a - dir; i -= dir)
{
if (checkitem(i) == 0) return i;
}
return -1;
}
// from an index, decide what the result is
// 0 = match, -1 is lower, 1 is higher
function checkitem(i)
{
var s = getitem(i).toLowerCase().substr(0, text.length);
if (s == text) return 0;
else return (s > text ? -1 : 1);
}
// from an index, get its string
// this abstracts over alternates
function getitem(i)
{
for ( ; i >= 0; i--)
{
var s = children[i].firstChild.firstChild.data;
if (s.indexOf(' ') == -1)
return s;
}
return ""; // should never be reached
}
}
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