/**
* Sorts the YAML fragments so that the "before" and "after" rules are met.
* Throws an error if there's a loop
*
* We can't use regular sorts here - we need a topological sort. Easiest
* way is with a DAG, so build up a DAG based on the before/after rules, then
* sort that.
*
* @return void
*/
protected function sortYamlFragments() {
$frags = $this->yamlConfigFragments;
// Build a directed graph
$dag = new SS_DAG($frags);
foreach ($frags as $i => $frag) {
foreach ($frags as $j => $otherfrag) {
if ($i == $j) continue;
$order = $this->relativeOrder($frag, $otherfrag);
if ($order == 'before') $dag->addedge($i, $j);
elseif ($order == 'after') $dag->addedge($j, $i);
}
}
$this->yamlConfigFragments = $dag->sort();
}
/**
* Sorts the YAML fragments so that the "before" and "after" rules are met.
* Throws an error if there's a loop
*
* We can't use regular sorts here - we need a topological sort. Easiest
* way is with a DAG, so build up a DAG based on the before/after rules, then
* sort that.
*
* @return void
*/
protected function sortYamlFragments()
{
$frags = $this->yamlConfigFragments;
// Build a directed graph
$dag = new SS_DAG($frags);
foreach ($frags as $i => $frag) {
foreach ($frags as $j => $otherfrag) {
if ($i == $j) {
continue;
}
$order = $this->relativeOrder($frag, $otherfrag);
if ($order == 'before') {
$dag->addedge($i, $j);
} elseif ($order == 'after') {
$dag->addedge($j, $i);
}
}
}
try {
$this->yamlConfigFragments = $dag->sort();
} catch (SS_DAG_CyclicException $e) {
if (!Director::isLive() && isset($_REQUEST['debug'])) {
$res = '<h1>Remaining config fragment graph</h1>';
$res .= '<dl>';
foreach ($e->dag as $node) {
$res .= "<dt>{$node['from']['module']}/{$node['from']['file']}#{$node['from']['name']}" . " marked to come after</dt><dd><ul>";
foreach ($node['to'] as $to) {
$res .= "<li>{$to['module']}/{$to['file']}#{$to['name']}</li>";
}
$res .= "</ul></dd>";
}
$res .= '</dl>';
echo $res;
}
user_error('Based on their before & after rules two fragments both need to be before/after each other', E_USER_ERROR);
}
}