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CelerityManagementMapWorkflow.php
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CelerityManagementMapWorkflow.php
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<?php
final class CelerityManagementMapWorkflow
extends CelerityManagementWorkflow {
public function didConstruct() {
$this
->setName('map')
->setExamples('**map** [options]')
->setSynopsis(pht('Rebuild static resource maps.'))
->setArguments(
array());
}
public function execute(PhutilArgumentParser $args) {
$resources_map = CelerityResources::getAll();
foreach ($resources_map as $name => $resources) {
$this->rebuildResources($resources);
}
return 0;
}
/**
* Rebuild the resource map for a resource source.
*
* @param CelerityResources Resource source to rebuild.
* @return void
*/
private function rebuildResources(CelerityResources $resources) {
$binary_map = $this->rebuildBinaryResources($resources);
$xformer = id(new CelerityResourceTransformer())
->setMinify(false)
->setRawURIMap(ipull($binary_map, 'uri'));
$text_map = $this->rebuildTextResources($resources, $xformer);
$resource_graph = array();
$requires_map = array();
$provides_map = array();
foreach ($text_map as $name => $info) {
if (isset($info['provides'])) {
$provides_map[$info['provides']] = $info['hash'];
// We only need to check for cycles and add this to the requires map
// if it actually requires anything.
if (!empty($info['requires'])) {
$resource_graph[$info['provides']] = $info['requires'];
$requires_map[$info['hash']] = $info['requires'];
}
}
}
$this->detectGraphCycles($resource_graph);
$hash_map = ipull($binary_map, 'hash') + ipull($text_map, 'hash');
// TODO: Actually do things.
var_dump($provides_map);
var_dump($requires_map);
var_dump($hash_map);
}
/**
* Find binary resources (like PNG and SWF) and return information about
* them.
*
* @param CelerityResources Resource map to find binary resources for.
* @return map<string, map<string, string>> Resource information map.
*/
private function rebuildBinaryResources(CelerityResources $resources) {
$binary_map = $resources->findBinaryResources();
$result_map = array();
foreach ($binary_map as $name => $data_hash) {
$hash = $resources->getCelerityHash($data_hash.$name);
$result_map[$name] = array(
'hash' => $hash,
'uri' => $resources->getResourceURI($hash, $name),
);
}
return $result_map;
}
/**
* Find text resources (like JS and CSS) and return information about them.
*
* @param CelerityResources Resource map to find text resources for.
* @param CelerityResourceTransformer Configured resource transformer.
* @return map<string, map<string, string>> Resource information map.
*/
private function rebuildTextResources(
CelerityResources $resources,
CelerityResourceTransformer $xformer) {
$text_map = $resources->findTextResources();
$result_map = array();
foreach ($text_map as $name => $data_hash) {
$raw_data = $resources->getResourceData($name);
$xformed_data = $xformer->transformResource($name, $raw_data);
$data_hash = $resources->getCelerityHash($xformed_data);
$hash = $resources->getCelerityHash($data_hash.$name);
list($provides, $requires) = $this->getProvidesAndRequires(
$name,
$raw_data);
$result_map[$name] = array(
'hash' => $hash,
);
if ($provides !== null) {
$result_map[$name] += array(
'provides' => $provides,
'requires' => $requires,
);
}
}
return $result_map;
}
/**
* Parse the `@provides` and `@requires` symbols out of a text resource, like
* JS or CSS.
*
* @param string Resource name.
* @param string Resource data.
* @return pair<string|null, list<string>|nul> The `@provides` symbol and the
* list of `@requires` symbols. If the resource is not part of the
* dependency graph, both are null.
*/
private function getProvidesAndRequires($name, $data) {
$parser = new PhutilDocblockParser();
$matches = array();
$ok = preg_match('@/[*][*].*?[*]/@s', $data, $matches);
if (!$ok) {
throw new Exception(
pht(
'Resource "%s" does not have a header doc comment. Encode '.
'dependency data in a header docblock.',
$name));
}
list($description, $metadata) = $parser->parse($matches[0]);
$provides = preg_split('/\s+/', trim(idx($metadata, 'provides')));
$requires = preg_split('/\s+/', trim(idx($metadata, 'requires')));
$provides = array_filter($provides);
$requires = array_filter($requires);
if (!$provides) {
// Tests and documentation-only JS is permitted to @provide no targets.
return array(null, null);
}
if (count($provides) > 1) {
throw new Exception(
pht(
'Resource "%s" must @provide at most one Celerity target.',
$name));
}
return array(head($provides), $requires);
}
/**
* Check for dependency cycles in the resource graph. Raises an exception if
* a cycle is detected.
*
* @param map<string, list<string>> Map of `@provides` symbols to their
* `@requires` symbols.
* @return void
*/
private function detectGraphCycles(array $nodes) {
$graph = id(new CelerityResourceGraph())
->addNodes($nodes)
->setResourceGraph($nodes)
->loadGraph();
foreach ($nodes as $provides => $requires) {
$cycle = $graph->detectCycles($provides);
if ($cycle) {
throw new Exception(
pht(
'Cycle detected in resource graph: %s',
implode(' > ', $cycle)));
}
}
}
}

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