behavior-line-linker.js
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	/**
	* @provides javelin-behavior-phabricator-line-linker
	* @requires javelin-behavior
	* javelin-stratcom
	* javelin-dom
	* javelin-history
	*/

	JX.behavior('phabricator-line-linker', function() {
	var origin = null;
	var target = null;
	var root = null;
	var highlighted = null;

	var editor_link = null;
	try {
	editor_link = JX.$('editor_link');
	} catch (ex) {
	// Ignore.
	}

	function getRowNumber(tr) {
	var th = tr.firstChild;
	return +(th.textContent \|\| th.innerText);
	}

	JX.Stratcom.listen(
	['click', 'mousedown'],
	['phabricator-source', 'tag:tr', 'tag:th', 'tag:a'],
	function(e) {
	if (!e.isNormalMouseEvent()) {
	return;
	}

	// Make sure the link we clicked is actually a line number in a source
	// table, not some kind of link in some element embedded inside the
	// table. The row's immediate ancestor table needs to be the table with
	// the "phabricator-source" sigil.

	var row = e.getNode('tag:tr');
	var table = e.getNode('phabricator-source');
	if (JX.DOM.findAbove(row, 'table') !== table) {
	return;
	}

	var number = getRowNumber(row);
	if (!number) {
	return;
	}

	e.kill();

	// If this is a click event, kill it. We handle mousedown and mouseup
	// instead.
	if (e.getType() === 'click') {
	return;
	}

	origin = row;
	target = origin;

	root = table;
	});

	var highlight = function(e) {
	if (!origin) {
	return;
	}

	if (e.getNode('phabricator-source') !== root) {
	return;
	}
	target = e.getNode('tag:tr');

	var min;
	var max;

	// NOTE: We're using position to figure out which order these rows are in,
	// not row numbers. We do this because Harbormaster build logs may have
	// multiple rows with the same row number.

	if (JX.$V(origin).y <= JX.$V(target).y) {
	min = origin;
	max = target;
	} else {
	min = target;
	max = origin;
	}

	// If we haven't changed highlighting, we don't have a list of highlighted
	// nodes yet. Assume every row is highlighted.
	var ii;
	if (highlighted === null) {
	highlighted = [];
	var rows = JX.DOM.scry(root, 'tr');
	for (ii = 0; ii < rows.length; ii++) {
	highlighted.push(rows[ii]);
	}
	}

	// Unhighlight any existing highlighted rows.
	for (ii = 0; ii < highlighted.length; ii++) {
	JX.DOM.alterClass(highlighted[ii], 'phabricator-source-highlight', false);
	}
	highlighted = [];

	// Highlight the newly selected rows.
	var cursor = min;
	while (true) {
	JX.DOM.alterClass(cursor, 'phabricator-source-highlight', true);
	highlighted.push(cursor);

	if (cursor === max) {
	break;
	}

	cursor = cursor.nextSibling;
	}
	};

	JX.Stratcom.listen('mouseover', 'phabricator-source', highlight);

	JX.Stratcom.listen(
	'mouseup',
	null,
	function(e) {
	if (!origin) {
	return;
	}

	highlight(e);
	e.kill();

	var o = getRowNumber(origin);
	var t = getRowNumber(target);
	var uri = JX.Stratcom.getData(root).uri;

	origin = null;
	target = null;
	root = null;

	var lines = (o == t ? o : Math.min(o, t) + '-' + Math.max(o, t));
	uri = uri + '$' + lines;

	JX.History.replace(uri);

	if (editor_link) {
	if (editor_link.href) {
	var editdata = JX.Stratcom.getData(editor_link);
	editor_link.href = editdata.link_template.replace('%25l', o);
	}
	}
	});

	});

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