mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
beafcf38db
The overhead of Zend_Cache in manifests is too high - we don't need LRU or tags, just somewhere to dump a bunch of data that persists You can replace the class used by defining SS_MANIFESTCACHE to be a class that implements the ManifestCache interface (we can't use the Config system to set this, as it isn't initialised yet).
334 lines
8.8 KiB
PHP
334 lines
8.8 KiB
PHP
<?php
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/**
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* A utility class which builds a manifest of the statics defined in all classes, along with their
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* access levels and values
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*
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* We use this to make the statics that the Config system uses as default values be truely immutable.
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*
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* It has the side effect of allowing Config to avoid private-level access restrictions, so we can
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* optionally catch attempts to modify the config statics (otherwise the modification will appear
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* to work, but won't actually have any effect - the equvilent of failing silently)
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*
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* @subpackage manifest
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*/
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class SS_ConfigStaticManifest {
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protected $base;
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protected $tests;
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protected $cache;
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protected $key;
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protected $index;
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protected $statics;
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static protected $initial_classes = array(
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'Object', 'ViewableData', 'Injector', 'Director'
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);
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/**
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* Constructs and initialises a new config static manifest, either loading the data
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* from the cache or re-scanning for classes.
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*
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* @param string $base The manifest base path.
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* @param bool $includeTests Include the contents of "tests" directories.
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* @param bool $forceRegen Force the manifest to be regenerated.
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* @param bool $cache If the manifest is regenerated, cache it.
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*/
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public function __construct($base, $includeTests = false, $forceRegen = false, $cache = true) {
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$this->base = $base;
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$this->tests = $includeTests;
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$cacheClass = defined('SS_MANIFESTCACHE') ? SS_MANIFESTCACHE : 'ManifestCache_File';
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$this->cache = new $cacheClass('staticmanifest'.($includeTests ? '_tests' : ''));
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$this->key = sha1($base);
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if(!$forceRegen) {
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$this->index = $this->cache->load($this->key);
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}
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if($this->index) {
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$this->statics = $this->index['$statics'];
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}
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else {
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$this->regenerate($cache);
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}
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}
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public function get($class, $name, $default) {
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if (!isset($this->statics[$class])) {
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if (isset($this->index[$class])) {
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$info = $this->index[$class];
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if (isset($info['key']) && $details = $this->cache->load($this->key.'_'.$info['key'])) {
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$this->statics += $details;
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}
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if (!isset($this->statics[$class])) {
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$this->handleFile(null, $info['path'], null);
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}
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}
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else {
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$this->statics[$class] = false;
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}
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}
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if (isset($this->statics[$class][$name])) {
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$static = $this->statics[$class][$name];
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if ($static['access'] != T_PRIVATE) {
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Deprecation::notice('3.1.0', "Config static $class::\$$name must be marked as private", Deprecation::SCOPE_GLOBAL);
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// Don't warn more than once per static
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$static['access'] = T_PRIVATE;
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}
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return $static['value'];
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}
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return $default;
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}
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/**
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* Completely regenerates the manifest file.
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*/
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public function regenerate($cache = true) {
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$this->index = array('$statics' => array());
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$this->statics = array();
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$finder = new ManifestFileFinder();
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$finder->setOptions(array(
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'name_regex' => '/^([^_].*\.php)$/',
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'ignore_files' => array('index.php', 'main.php', 'cli-script.php'),
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'ignore_tests' => !$this->tests,
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'file_callback' => array($this, 'handleFile')
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));
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$finder->find($this->base);
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if($cache) {
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$keysets = array();
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foreach ($this->statics as $class => $details) {
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if (in_array($class, self::$initial_classes)) {
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$this->index['$statics'][$class] = $details;
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}
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else {
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$key = sha1($class);
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$this->index[$class]['key'] = $key;
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$keysets[$key][$class] = $details;
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}
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}
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foreach ($keysets as $key => $details) {
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$this->cache->save($details, $this->key.'_'.$key);
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}
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$this->cache->save($this->index, $this->key);
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}
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}
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public function handleFile($basename, $pathname, $depth) {
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$parser = new SS_ConfigStaticManifest_Parser($pathname);
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$parser->parse();
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$this->index = array_merge($this->index, $parser->getInfo());
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$this->statics = array_merge($this->statics, $parser->getStatics());
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}
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public function getStatics() {
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return $this->statics;
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}
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}
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/**
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* A parser that processes a PHP file, using PHP's built in parser to get a string of tokens,
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* then processing them to find the static class variables, their access levels & values
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*
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* We can't do this using TokenisedRegularExpression because we need to keep track of state
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* as we process the token list (when we enter and leave a namespace or class, when we see
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* an access level keyword, etc)
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*/
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class SS_ConfigStaticManifest_Parser {
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protected $info = array();
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protected $statics = array();
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protected $path;
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protected $tokens;
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protected $length;
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protected $pos;
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function __construct($path) {
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$this->path = $path;
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$file = file_get_contents($path);
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$this->tokens = token_get_all($file);
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$this->length = count($this->tokens);
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$this->pos = 0;
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}
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function getInfo() {
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return $this->info;
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}
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function getStatics() {
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return $this->statics;
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}
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/**
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* Get the next token to process, incrementing the pointer
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*
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* @param bool $ignoreWhitespace - if true will skip any whitespace tokens & only return non-whitespace ones
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* @return null | int - Either the next token or null if there isn't one
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*/
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protected function next($ignoreWhitespace = true) {
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do {
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if($this->pos >= $this->length) return null;
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$next = $this->tokens[$this->pos++];
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}
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while($ignoreWhitespace && is_array($next) && $next[0] == T_WHITESPACE);
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return $next;
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}
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/**
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* Parse the given file to find the static variables declared in it, along with their access & values
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*/
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function parse() {
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$depth = 0; $namespace = null; $class = null; $clsdepth = null; $access = 0;
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while($token = $this->next()) {
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$type = is_array($token) ? $token[0] : $token;
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if($type == T_CLASS) {
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$next = $this->next();
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if($next[0] != T_STRING) {
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user_error("Couldn\'t parse {$this->path} when building config static manifest", E_USER_ERROR);
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}
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$class = $next[1];
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}
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else if($type == T_NAMESPACE) {
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$next = $this->next();
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if($next[0] != T_STRING) {
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user_error("Couldn\'t parse {$this->path} when building config static manifest", E_USER_ERROR);
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}
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$namespace = $next[1];
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}
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else if($type == '{' || $type == T_CURLY_OPEN || $type == T_DOLLAR_OPEN_CURLY_BRACES){
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$depth += 1;
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if($class && !$clsdepth) $clsdepth = $depth;
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}
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else if($type == '}') {
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$depth -= 1;
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if($depth < $clsdepth) $class = $clsdepth = null;
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if($depth < 0) user_error("Hmm - depth calc wrong, hit negatives", E_USER_ERROR);
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}
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else if($type == T_PUBLIC || $type == T_PRIVATE || $type == T_PROTECTED) {
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$access = $type;
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}
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else if($type == T_STATIC) {
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if($class && $depth == $clsdepth) $this->parseStatic($access, $namespace ? $namespace.'\\'.$class : $class);
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}
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else {
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$access = '';
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}
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}
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}
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/**
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* During parsing we've found a "static" keyword. Parse out the variable names and value
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* assignments that follow.
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*
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* Seperated out from parse partially so that we can recurse if there are multiple statics
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* being declared in a comma seperated list
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*/
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function parseStatic($access, $class) {
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$variable = null;
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$value = '';
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while($token = $this->next()) {
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$type = is_array($token) ? $token[0] : $token;
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if($type == T_PUBLIC || $type == T_PRIVATE || $type == T_PROTECTED) {
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$access = $type;
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}
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else if($type == T_FUNCTION) {
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return;
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}
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else if($type == T_VARIABLE) {
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$variable = substr($token[1], 1); // Cut off initial "$"
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}
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else if($type == ';' || $type == ',' || $type == '=') {
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break;
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}
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else if($type == T_COMMENT || $type == T_DOC_COMMENT) {
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// NOP
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}
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else {
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user_error('Unexpected token when building static manifest: '.print_r($token, true), E_USER_ERROR);
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}
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}
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if($token == '=') {
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$depth = 0;
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while($token = $this->next(false)){
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$type = is_array($token) ? $token[0] : $token;
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// Track array nesting depth
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if($type == T_ARRAY) {
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$depth += 1;
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}
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else if($type == ')') {
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$depth -= 1;
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}
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// Parse out the assignment side of a static declaration, ending on either a ';' or a ',' outside an array
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if($type == T_WHITESPACE) {
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$value .= ' ';
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}
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else if($type == ';' || ($type == ',' && !$depth)) {
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break;
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}
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// Statics can reference class constants with self:: (and that won't work in eval)
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else if($type == T_STRING && $token[1] == 'self') {
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$value .= $class;
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}
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else {
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$value .= is_array($token) ? $token[1] : $token;
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}
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}
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}
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if (!isset($this->info[$class])) {
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$this->info[$class] = array(
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'path' => $this->path,
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'mtime' => filemtime($this->path),
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);
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}
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if(!isset($this->statics[$class])) {
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$this->statics[$class] = array();
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}
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$value = trim($value);
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if ($value) {
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$value = eval('static $temp = '.$value.";\n".'return $temp'.";\n");
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}
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else {
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$value = null;
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}
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$this->statics[$class][$variable] = array(
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'access' => $access,
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'value' => $value
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);
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if($token == ',') $this->parseStatic($access, $class);
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}
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} |