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<?php
/*
* This file is part of Mustache.php.
*
* (c) 2010-2017 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* A Mustache implementation in PHP.
*
* {@link http://defunkt.github.com/mustache}
*
* Mustache is a framework-agnostic logic-less templating language. It enforces separation of view
* logic from template files. In fact, it is not even possible to embed logic in the template.
*
* This is very, very rad.
*
* @author Justin Hileman {@link http://justinhileman.com}
*/
class Mustache_Engine
{
const VERSION = '2.12.0';
const SPEC_VERSION = '1.1.2';
const PRAGMA_FILTERS = 'FILTERS';
const PRAGMA_BLOCKS = 'BLOCKS';
const PRAGMA_ANCHORED_DOT = 'ANCHORED-DOT';
// Known pragmas
private static $knownPragmas = array(
self::PRAGMA_FILTERS => true,
self::PRAGMA_BLOCKS => true,
self::PRAGMA_ANCHORED_DOT => true,
);
// Template cache
private $templates = array();
// Environment
private $templateClassPrefix = '__Mustache_';
private $cache;
private $lambdaCache;
private $cacheLambdaTemplates = false;
private $loader;
private $partialsLoader;
private $helpers;
private $escape;
private $entityFlags = ENT_COMPAT;
private $charset = 'UTF-8';
private $logger;
private $strictCallables = false;
private $pragmas = array();
private $delimiters;
// Services
private $tokenizer;
private $parser;
private $compiler;
/**
* Mustache class constructor.
*
* Passing an $options array allows overriding certain Mustache options during instantiation:
*
* $options = array(
* // The class prefix for compiled templates. Defaults to '__Mustache_'.
* 'template_class_prefix' => '__MyTemplates_',
*
* // A Mustache cache instance or a cache directory string for compiled templates.
* // Mustache will not cache templates unless this is set.
* 'cache' => dirname(__FILE__).'/tmp/cache/mustache',
*
* // Override default permissions for cache files. Defaults to using the system-defined umask. It is
* // *strongly* recommended that you configure your umask properly rather than overriding permissions here.
* 'cache_file_mode' => 0666,
*
* // Optionally, enable caching for lambda section templates. This is generally not recommended, as lambda
* // sections are often too dynamic to benefit from caching.
* 'cache_lambda_templates' => true,
*
* // Customize the tag delimiters used by this engine instance. Note that overriding here changes the
* // delimiters used to parse all templates and partials loaded by this instance. To override just for a
* // single template, use an inline "change delimiters" tag at the start of the template file:
* //
* // {{=<% %>=}}
* //
* 'delimiters' => '<% %>',
*
* // A Mustache template loader instance. Uses a StringLoader if not specified.
* 'loader' => new Mustache_Loader_FilesystemLoader(dirname(__FILE__).'/views'),
*
* // A Mustache loader instance for partials.
* 'partials_loader' => new Mustache_Loader_FilesystemLoader(dirname(__FILE__).'/views/partials'),
*
* // An array of Mustache partials. Useful for quick-and-dirty string template loading, but not as
* // efficient or lazy as a Filesystem (or database) loader.
* 'partials' => array('foo' => file_get_contents(dirname(__FILE__).'/views/partials/foo.mustache')),
*
* // An array of 'helpers'. Helpers can be global variables or objects, closures (e.g. for higher order
* // sections), or any other valid Mustache context value. They will be prepended to the context stack,
* // so they will be available in any template loaded by this Mustache instance.
* 'helpers' => array('i18n' => function ($text) {
* // do something translatey here...
* }),
*
* // An 'escape' callback, responsible for escaping double-mustache variables.
* 'escape' => function ($value) {
* return htmlspecialchars($buffer, ENT_COMPAT, 'UTF-8');
* },
*
* // Type argument for `htmlspecialchars`. Defaults to ENT_COMPAT. You may prefer ENT_QUOTES.
* 'entity_flags' => ENT_QUOTES,
*
* // Character set for `htmlspecialchars`. Defaults to 'UTF-8'. Use 'UTF-8'.
* 'charset' => 'ISO-8859-1',
*
* // A Mustache Logger instance. No logging will occur unless this is set. Using a PSR-3 compatible
* // logging library -- such as Monolog -- is highly recommended. A simple stream logger implementation is
* // available as well:
* 'logger' => new Mustache_Logger_StreamLogger('php://stderr'),
*
* // Only treat Closure instances and invokable classes as callable. If true, values like
* // `array('ClassName', 'methodName')` and `array($classInstance, 'methodName')`, which are traditionally
* // "callable" in PHP, are not called to resolve variables for interpolation or section contexts. This
* // helps protect against arbitrary code execution when user input is passed directly into the template.
* // This currently defaults to false, but will default to true in v3.0.
* 'strict_callables' => true,
*
* // Enable pragmas across all templates, regardless of the presence of pragma tags in the individual
* // templates.
* 'pragmas' => [Mustache_Engine::PRAGMA_FILTERS],
* );
*
* @throws Mustache_Exception_InvalidArgumentException If `escape` option is not callable
*
* @param array $options (default: array())
*/
public function __construct(array $options = array())
{
if (isset($options['template_class_prefix'])) {
if ((string) $options['template_class_prefix'] === '') {
throw new Mustache_Exception_InvalidArgumentException('Mustache Constructor "template_class_prefix" must not be empty');
}
$this->templateClassPrefix = $options['template_class_prefix'];
}
if (isset($options['cache'])) {
$cache = $options['cache'];
if (is_string($cache)) {
$mode = isset($options['cache_file_mode']) ? $options['cache_file_mode'] : null;
$cache = new Mustache_Cache_FilesystemCache($cache, $mode);
}
$this->setCache($cache);
}
if (isset($options['cache_lambda_templates'])) {
$this->cacheLambdaTemplates = (bool) $options['cache_lambda_templates'];
}
if (isset($options['loader'])) {
$this->setLoader($options['loader']);
}
if (isset($options['partials_loader'])) {
$this->setPartialsLoader($options['partials_loader']);
}
if (isset($options['partials'])) {
$this->setPartials($options['partials']);
}
if (isset($options['helpers'])) {
$this->setHelpers($options['helpers']);
}
if (isset($options['escape'])) {
if (!is_callable($options['escape'])) {
throw new Mustache_Exception_InvalidArgumentException('Mustache Constructor "escape" option must be callable');
}
$this->escape = $options['escape'];
}
if (isset($options['entity_flags'])) {
$this->entityFlags = $options['entity_flags'];
}
if (isset($options['charset'])) {
$this->charset = $options['charset'];
}
if (isset($options['logger'])) {
$this->setLogger($options['logger']);
}
if (isset($options['strict_callables'])) {
$this->strictCallables = $options['strict_callables'];
}
if (isset($options['delimiters'])) {
$this->delimiters = $options['delimiters'];
}
if (isset($options['pragmas'])) {
foreach ($options['pragmas'] as $pragma) {
if (!isset(self::$knownPragmas[$pragma])) {
throw new Mustache_Exception_InvalidArgumentException(sprintf('Unknown pragma: "%s".', $pragma));
}
$this->pragmas[$pragma] = true;
}
}
}
/**
* Shortcut 'render' invocation.
*
* Equivalent to calling `$mustache->loadTemplate($template)->render($context);`
*
* @see Mustache_Engine::loadTemplate
* @see Mustache_Template::render
*
* @param string $template
* @param mixed $context (default: array())
*
* @return string Rendered template
*/
public function render($template, $context = array())
{
return $this->loadTemplate($template)->render($context);
}
/**
* Get the current Mustache escape callback.
*
* @return callable|null
*/
public function getEscape()
{
return $this->escape;
}
/**
* Get the current Mustache entitity type to escape.
*
* @return int
*/
public function getEntityFlags()
{
return $this->entityFlags;
}
/**
* Get the current Mustache character set.
*
* @return string
*/
public function getCharset()
{
return $this->charset;
}
/**
* Get the current globally enabled pragmas.
*
* @return array
*/
public function getPragmas()
{
return array_keys($this->pragmas);
}
/**
* Set the Mustache template Loader instance.
*
* @param Mustache_Loader $loader
*/
public function setLoader(Mustache_Loader $loader)
{
$this->loader = $loader;
}
/**
* Get the current Mustache template Loader instance.
*
* If no Loader instance has been explicitly specified, this method will instantiate and return
* a StringLoader instance.
*
* @return Mustache_Loader
*/
public function getLoader()
{
if (!isset($this->loader)) {
$this->loader = new Mustache_Loader_StringLoader();
}
return $this->loader;
}
/**
* Set the Mustache partials Loader instance.
*
* @param Mustache_Loader $partialsLoader
*/
public function setPartialsLoader(Mustache_Loader $partialsLoader)
{
$this->partialsLoader = $partialsLoader;
}
/**
* Get the current Mustache partials Loader instance.
*
* If no Loader instance has been explicitly specified, this method will instantiate and return
* an ArrayLoader instance.
*
* @return Mustache_Loader
*/
public function getPartialsLoader()
{
if (!isset($this->partialsLoader)) {
$this->partialsLoader = new Mustache_Loader_ArrayLoader();
}
return $this->partialsLoader;
}
/**
* Set partials for the current partials Loader instance.
*
* @throws Mustache_Exception_RuntimeException If the current Loader instance is immutable
*
* @param array $partials (default: array())
*/
public function setPartials(array $partials = array())
{
if (!isset($this->partialsLoader)) {
$this->partialsLoader = new Mustache_Loader_ArrayLoader();
}
if (!$this->partialsLoader instanceof Mustache_Loader_MutableLoader) {
throw new Mustache_Exception_RuntimeException('Unable to set partials on an immutable Mustache Loader instance');
}
$this->partialsLoader->setTemplates($partials);
}
/**
* Set an array of Mustache helpers.
*
* An array of 'helpers'. Helpers can be global variables or objects, closures (e.g. for higher order sections), or
* any other valid Mustache context value. They will be prepended to the context stack, so they will be available in
* any template loaded by this Mustache instance.
*
* @throws Mustache_Exception_InvalidArgumentException if $helpers is not an array or Traversable
*
* @param array|Traversable $helpers
*/
public function setHelpers($helpers)
{
if (!is_array($helpers) && !$helpers instanceof Traversable) {
throw new Mustache_Exception_InvalidArgumentException('setHelpers expects an array of helpers');
}
$this->getHelpers()->clear();
foreach ($helpers as $name => $helper) {
$this->addHelper($name, $helper);
}
}
/**
* Get the current set of Mustache helpers.
*
* @see Mustache_Engine::setHelpers
*
* @return Mustache_HelperCollection
*/
public function getHelpers()
{
if (!isset($this->helpers)) {
$this->helpers = new Mustache_HelperCollection();
}
return $this->helpers;
}
/**
* Add a new Mustache helper.
*
* @see Mustache_Engine::setHelpers
*
* @param string $name
* @param mixed $helper
*/
public function addHelper($name, $helper)
{
$this->getHelpers()->add($name, $helper);
}
/**
* Get a Mustache helper by name.
*
* @see Mustache_Engine::setHelpers
*
* @param string $name
*
* @return mixed Helper
*/
public function getHelper($name)
{
return $this->getHelpers()->get($name);
}
/**
* Check whether this Mustache instance has a helper.
*
* @see Mustache_Engine::setHelpers
*
* @param string $name
*
* @return bool True if the helper is present
*/
public function hasHelper($name)
{
return $this->getHelpers()->has($name);
}
/**
* Remove a helper by name.
*
* @see Mustache_Engine::setHelpers
*
* @param string $name
*/
public function removeHelper($name)
{
$this->getHelpers()->remove($name);
}
/**
* Set the Mustache Logger instance.
*
* @throws Mustache_Exception_InvalidArgumentException If logger is not an instance of Mustache_Logger or Psr\Log\LoggerInterface
*
* @param Mustache_Logger|Psr\Log\LoggerInterface $logger
*/
public function setLogger($logger = null)
{
if ($logger !== null && !($logger instanceof Mustache_Logger || is_a($logger, 'Psr\\Log\\LoggerInterface'))) {
throw new Mustache_Exception_InvalidArgumentException('Expected an instance of Mustache_Logger or Psr\\Log\\LoggerInterface.');
}
if ($this->getCache()->getLogger() === null) {
$this->getCache()->setLogger($logger);
}
$this->logger = $logger;
}
/**
* Get the current Mustache Logger instance.
*
* @return Mustache_Logger|Psr\Log\LoggerInterface
*/
public function getLogger()
{
return $this->logger;
}
/**
* Set the Mustache Tokenizer instance.
*
* @param Mustache_Tokenizer $tokenizer
*/
public function setTokenizer(Mustache_Tokenizer $tokenizer)
{
$this->tokenizer = $tokenizer;
}
/**
* Get the current Mustache Tokenizer instance.
*
* If no Tokenizer instance has been explicitly specified, this method will instantiate and return a new one.
*
* @return Mustache_Tokenizer
*/
public function getTokenizer()
{
if (!isset($this->tokenizer)) {
$this->tokenizer = new Mustache_Tokenizer();
}
return $this->tokenizer;
}
/**
* Set the Mustache Parser instance.
*
* @param Mustache_Parser $parser
*/
public function setParser(Mustache_Parser $parser)
{
$this->parser = $parser;
}
/**
* Get the current Mustache Parser instance.
*
* If no Parser instance has been explicitly specified, this method will instantiate and return a new one.
*
* @return Mustache_Parser
*/
public function getParser()
{
if (!isset($this->parser)) {
$this->parser = new Mustache_Parser();
}
return $this->parser;
}
/**
* Set the Mustache Compiler instance.
*
* @param Mustache_Compiler $compiler
*/
public function setCompiler(Mustache_Compiler $compiler)
{
$this->compiler = $compiler;
}
/**
* Get the current Mustache Compiler instance.
*
* If no Compiler instance has been explicitly specified, this method will instantiate and return a new one.
*
* @return Mustache_Compiler
*/
public function getCompiler()
{
if (!isset($this->compiler)) {
$this->compiler = new Mustache_Compiler();
}
return $this->compiler;
}
/**
* Set the Mustache Cache instance.
*
* @param Mustache_Cache $cache
*/
public function setCache(Mustache_Cache $cache)
{
if (isset($this->logger) && $cache->getLogger() === null) {
$cache->setLogger($this->getLogger());
}
$this->cache = $cache;
}
/**
* Get the current Mustache Cache instance.
*
* If no Cache instance has been explicitly specified, this method will instantiate and return a new one.
*
* @return Mustache_Cache
*/
public function getCache()
{
if (!isset($this->cache)) {
$this->setCache(new Mustache_Cache_NoopCache());
}
return $this->cache;
}
/**
* Get the current Lambda Cache instance.
*
* If 'cache_lambda_templates' is enabled, this is the default cache instance. Otherwise, it is a NoopCache.
*
* @see Mustache_Engine::getCache
*
* @return Mustache_Cache
*/
protected function getLambdaCache()
{
if ($this->cacheLambdaTemplates) {
return $this->getCache();
}
if (!isset($this->lambdaCache)) {
$this->lambdaCache = new Mustache_Cache_NoopCache();
}
return $this->lambdaCache;
}
/**
* Helper method to generate a Mustache template class.
*
* This method must be updated any time options are added which make it so
* the same template could be parsed and compiled multiple different ways.
*
* @param string|Mustache_Source $source
*
* @return string Mustache Template class name
*/
public function getTemplateClassName($source)
{
// For the most part, adding a new option here should do the trick.
//
// Pick a value here which is unique for each possible way the template
// could be compiled... but not necessarily unique per option value. See
// escape below, which only needs to differentiate between 'custom' and
// 'default' escapes.
//
// Keep this list in alphabetical order :)
$chunks = array(
'charset' => $this->charset,
'delimiters' => $this->delimiters ? $this->delimiters : '{{ }}',
'entityFlags' => $this->entityFlags,
'escape' => isset($this->escape) ? 'custom' : 'default',
'key' => ($source instanceof Mustache_Source) ? $source->getKey() : 'source',
'pragmas' => $this->getPragmas(),
'strictCallables' => $this->strictCallables,
'version' => self::VERSION,
);
$key = json_encode($chunks);
// Template Source instances have already provided their own source key. For strings, just include the whole
// source string in the md5 hash.
if (!$source instanceof Mustache_Source) {
$key .= "\n" . $source;
}
return $this->templateClassPrefix . md5($key);
}
/**
* Load a Mustache Template by name.
*
* @param string $name
*
* @return Mustache_Template
*/
public function loadTemplate($name)
{
return $this->loadSource($this->getLoader()->load($name));
}
/**
* Load a Mustache partial Template by name.
*
* This is a helper method used internally by Template instances for loading partial templates. You can most likely
* ignore it completely.
*
* @param string $name
*
* @return Mustache_Template
*/
public function loadPartial($name)
{
try {
if (isset($this->partialsLoader)) {
$loader = $this->partialsLoader;
} elseif (isset($this->loader) && !$this->loader instanceof Mustache_Loader_StringLoader) {
$loader = $this->loader;
} else {
throw new Mustache_Exception_UnknownTemplateException($name);
}
return $this->loadSource($loader->load($name));
} catch (Mustache_Exception_UnknownTemplateException $e) {
// If the named partial cannot be found, log then return null.
$this->log(
Mustache_Logger::WARNING,
'Partial not found: "{name}"',
array('name' => $e->getTemplateName())
);
}
}
/**
* Load a Mustache lambda Template by source.
*
* This is a helper method used by Template instances to generate subtemplates for Lambda sections. You can most
* likely ignore it completely.
*
* @param string $source
* @param string $delims (default: null)
*
* @return Mustache_Template
*/
public function loadLambda($source, $delims = null)
{
if ($delims !== null) {
$source = $delims . "\n" . $source;
}
return $this->loadSource($source, $this->getLambdaCache());
}
/**
* Instantiate and return a Mustache Template instance by source.
*
* Optionally provide a Mustache_Cache instance. This is used internally by Mustache_Engine::loadLambda to respect
* the 'cache_lambda_templates' configuration option.
*
* @see Mustache_Engine::loadTemplate
* @see Mustache_Engine::loadPartial
* @see Mustache_Engine::loadLambda
*
* @param string|Mustache_Source $source
* @param Mustache_Cache $cache (default: null)
*
* @return Mustache_Template
*/
private function loadSource($source, Mustache_Cache $cache = null)
{
$className = $this->getTemplateClassName($source);
if (!isset($this->templates[$className])) {
if ($cache === null) {
$cache = $this->getCache();
}
if (!class_exists($className, false)) {
if (!$cache->load($className)) {
$compiled = $this->compile($source);
$cache->cache($className, $compiled);
}
}
$this->log(
Mustache_Logger::DEBUG,
'Instantiating template: "{className}"',
array('className' => $className)
);
$this->templates[$className] = new $className($this);
}
return $this->templates[$className];
}
/**
* Helper method to tokenize a Mustache template.
*
* @see Mustache_Tokenizer::scan
*
* @param string $source
*
* @return array Tokens
*/
private function tokenize($source)
{
return $this->getTokenizer()->scan($source, $this->delimiters);
}
/**
* Helper method to parse a Mustache template.
*
* @see Mustache_Parser::parse
*
* @param string $source
*
* @return array Token tree
*/
private function parse($source)
{
$parser = $this->getParser();
$parser->setPragmas($this->getPragmas());
return $parser->parse($this->tokenize($source));
}
/**
* Helper method to compile a Mustache template.
*
* @see Mustache_Compiler::compile
*
* @param string|Mustache_Source $source
*
* @return string generated Mustache template class code
*/
private function compile($source)
{
$name = $this->getTemplateClassName($source);
$this->log(
Mustache_Logger::INFO,
'Compiling template to "{className}" class',
array('className' => $name)
);
if ($source instanceof Mustache_Source) {
$source = $source->getSource();
}
$tree = $this->parse($source);
$compiler = $this->getCompiler();
$compiler->setPragmas($this->getPragmas());
return $compiler->compile($source, $tree, $name, isset($this->escape), $this->charset, $this->strictCallables, $this->entityFlags);
}
/**
* Add a log record if logging is enabled.
*
* @param int $level The logging level
* @param string $message The log message
* @param array $context The log context
*/
private function log($level, $message, array $context = array())
{
if (isset($this->logger)) {
$this->logger->log($level, $message, $context);
}
}
}