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<?php
namespace Auryn;
class Injector
{
const A_RAW = ':';
const A_DELEGATE = '+';
const A_DEFINE = '@';
const I_BINDINGS = 1;
const I_DELEGATES = 2;
const I_PREPARES = 4;
const I_ALIASES = 8;
const I_SHARES = 16;
const I_ALL = 31;
const E_NON_EMPTY_STRING_ALIAS = 1;
const M_NON_EMPTY_STRING_ALIAS = "Invalid alias: non-empty string required at arguments 1 and 2";
const E_SHARED_CANNOT_ALIAS = 2;
const M_SHARED_CANNOT_ALIAS = "Cannot alias class %s to %s because it is currently shared";
const E_SHARE_ARGUMENT = 3;
const M_SHARE_ARGUMENT = "%s::share() requires a string class name or object instance at Argument 1; %s specified";
const E_ALIASED_CANNOT_SHARE = 4;
const M_ALIASED_CANNOT_SHARE = "Cannot share class %s because it is currently aliased to %s";
const E_INVOKABLE = 5;
const M_INVOKABLE = "Invalid invokable: callable or provisional string required";
const E_NON_PUBLIC_CONSTRUCTOR = 6;
const M_NON_PUBLIC_CONSTRUCTOR = "Cannot instantiate protected/private constructor in class %s";
const E_NEEDS_DEFINITION = 7;
const M_NEEDS_DEFINITION = "Injection definition required for %s %s";
const E_MAKE_FAILURE = 8;
const M_MAKE_FAILURE = "Could not make %s: %s";
const E_UNDEFINED_PARAM = 9;
const M_UNDEFINED_PARAM = "No definition available to provision typeless parameter \$%s at position %d in %s()%s";
const E_DELEGATE_ARGUMENT = 10;
const M_DELEGATE_ARGUMENT = "%s::delegate expects a valid callable or executable class::method string at Argument 2%s";
const E_CYCLIC_DEPENDENCY = 11;
const M_CYCLIC_DEPENDENCY = "Detected a cyclic dependency while provisioning %s";
const E_MAKING_FAILED = 12;
const M_MAKING_FAILED = "Making %s did not result in an object, instead result is of type '%s'";
private $reflector;
private $classDefinitions = array();
private $paramDefinitions = array();
private $aliases = array();
private $shares = array();
private $prepares = array();
private $delegates = array();
private $inProgressMakes = array();
public function __construct(Reflector $reflector = null)
{
$this->reflector = $reflector ?: new CachingReflector;
}
public function __clone()
{
$this->inProgressMakes = array();
}
/**
* Define instantiation directives for the specified class
*
* @param string $name The class (or alias) whose constructor arguments we wish to define
* @param array $args An array mapping parameter names to values/instructions
* @return self
*/
public function define($name, array $args)
{
list(, $normalizedName) = $this->resolveAlias($name);
$this->classDefinitions[$normalizedName] = $args;
return $this;
}
/**
* Assign a global default value for all parameters named $paramName
*
* Global parameter definitions are only used for parameters with no typehint, pre-defined or
* call-time definition.
*
* @param string $paramName The parameter name for which this value applies
* @param mixed $value The value to inject for this parameter name
* @return self
*/
public function defineParam($paramName, $value)
{
$this->paramDefinitions[$paramName] = $value;
return $this;
}
/**
* Define an alias for all occurrences of a given typehint
*
* Use this method to specify implementation classes for interface and abstract class typehints.
*
* @param string $original The typehint to replace
* @param string $alias The implementation name
* @throws ConfigException if any argument is empty or not a string
* @return self
*/
public function alias($original, $alias)
{
if (empty($original) || !is_string($original)) {
throw new ConfigException(
self::M_NON_EMPTY_STRING_ALIAS,
self::E_NON_EMPTY_STRING_ALIAS
);
}
if (empty($alias) || !is_string($alias)) {
throw new ConfigException(
self::M_NON_EMPTY_STRING_ALIAS,
self::E_NON_EMPTY_STRING_ALIAS
);
}
$originalNormalized = $this->normalizeName($original);
if (isset($this->shares[$originalNormalized])) {
throw new ConfigException(
sprintf(
self::M_SHARED_CANNOT_ALIAS,
$this->normalizeName(get_class($this->shares[$originalNormalized])),
$alias
),
self::E_SHARED_CANNOT_ALIAS
);
}
if (array_key_exists($originalNormalized, $this->shares)) {
$aliasNormalized = $this->normalizeName($alias);
$this->shares[$aliasNormalized] = null;
unset($this->shares[$originalNormalized]);
}
$this->aliases[$originalNormalized] = $alias;
return $this;
}
private function normalizeName($className)
{
return ltrim(strtolower($className), '\\');
}
/**
* Share the specified class/instance across the Injector context
*
* @param mixed $nameOrInstance The class or object to share
* @throws ConfigException if $nameOrInstance is not a string or an object
* @return self
*/
public function share($nameOrInstance)
{
if (is_string($nameOrInstance)) {
$this->shareClass($nameOrInstance);
} elseif (is_object($nameOrInstance)) {
$this->shareInstance($nameOrInstance);
} else {
throw new ConfigException(
sprintf(
self::M_SHARE_ARGUMENT,
__CLASS__,
gettype($nameOrInstance)
),
self::E_SHARE_ARGUMENT
);
}
return $this;
}
private function shareClass($nameOrInstance)
{
list(, $normalizedName) = $this->resolveAlias($nameOrInstance);
$this->shares[$normalizedName] = isset($this->shares[$normalizedName])
? $this->shares[$normalizedName]
: null;
}
private function resolveAlias($name)
{
$normalizedName = $this->normalizeName($name);
if (isset($this->aliases[$normalizedName])) {
$name = $this->aliases[$normalizedName];
$normalizedName = $this->normalizeName($name);
}
return array($name, $normalizedName);
}
private function shareInstance($obj)
{
$normalizedName = $this->normalizeName(get_class($obj));
if (isset($this->aliases[$normalizedName])) {
// You cannot share an instance of a class name that is already aliased
throw new ConfigException(
sprintf(
self::M_ALIASED_CANNOT_SHARE,
$normalizedName,
$this->aliases[$normalizedName]
),
self::E_ALIASED_CANNOT_SHARE
);
}
$this->shares[$normalizedName] = $obj;
}
/**
* Register a prepare callable to modify/prepare objects of type $name after instantiation
*
* Any callable or provisionable invokable may be specified. Preparers are passed two
* arguments: the instantiated object to be mutated and the current Injector instance.
*
* @param string $name
* @param mixed $callableOrMethodStr Any callable or provisionable invokable method
* @throws InjectionException if $callableOrMethodStr is not a callable.
* See https://github.com/rdlowrey/auryn#injecting-for-execution
* @return self
*/
public function prepare($name, $callableOrMethodStr)
{
if ($this->isExecutable($callableOrMethodStr) === false) {
throw InjectionException::fromInvalidCallable(
$this->inProgressMakes,
$callableOrMethodStr
);
}
list(, $normalizedName) = $this->resolveAlias($name);
$this->prepares[$normalizedName] = $callableOrMethodStr;
return $this;
}
private function isExecutable($exe)
{
if (is_callable($exe)) {
return true;
}
if (is_string($exe) && method_exists($exe, '__invoke')) {
return true;
}
if (is_array($exe) && isset($exe[0], $exe[1]) && method_exists($exe[0], $exe[1])) {
return true;
}
return false;
}
/**
* Delegate the creation of $name instances to the specified callable
*
* @param string $name
* @param mixed $callableOrMethodStr Any callable or provisionable invokable method
* @throws ConfigException if $callableOrMethodStr is not a callable.
* @return self
*/
public function delegate($name, $callableOrMethodStr)
{
if ($this->isExecutable($callableOrMethodStr) === false) {
$errorDetail = '';
if (is_string($callableOrMethodStr)) {
$errorDetail = " but received '$callableOrMethodStr'";
} elseif (is_array($callableOrMethodStr) &&
count($callableOrMethodStr) === 2 &&
array_key_exists(0, $callableOrMethodStr) &&
array_key_exists(1, $callableOrMethodStr)
) {
if (is_string($callableOrMethodStr[0]) && is_string($callableOrMethodStr[1])) {
$errorDetail = " but received ['".$callableOrMethodStr[0]."', '".$callableOrMethodStr[1]."']";
}
}
throw new ConfigException(
sprintf(self::M_DELEGATE_ARGUMENT, __CLASS__, $errorDetail),
self::E_DELEGATE_ARGUMENT
);
}
$normalizedName = $this->normalizeName($name);
$this->delegates[$normalizedName] = $callableOrMethodStr;
return $this;
}
/**
* Retrieve stored data for the specified definition type
*
* Exposes introspection of existing binds/delegates/shares/etc for decoration and composition.
*
* @param string $nameFilter An optional class name filter
* @param int $typeFilter A bitmask of Injector::* type constant flags
* @return array
*/
public function inspect($nameFilter = null, $typeFilter = null)
{
$result = array();
$name = $nameFilter ? $this->normalizeName($nameFilter) : null;
if (empty($typeFilter)) {
$typeFilter = self::I_ALL;
}
$types = array(
self::I_BINDINGS => "classDefinitions",
self::I_DELEGATES => "delegates",
self::I_PREPARES => "prepares",
self::I_ALIASES => "aliases",
self::I_SHARES => "shares"
);
foreach ($types as $type => $source) {
if ($typeFilter & $type) {
$result[$type] = $this->filter($this->{$source}, $name);
}
}
return $result;
}
private function filter($source, $name)
{
if (empty($name)) {
return $source;
} elseif (array_key_exists($name, $source)) {
return array($name => $source[$name]);
} else {
return array();
}
}
/**
* Instantiate/provision a class instance
*
* @param string $name
* @param array $args
* @throws InjectionException if a cyclic gets detected when provisioning
* @return mixed
*/
public function make($name, array $args = array())
{
list($className, $normalizedClass) = $this->resolveAlias($name);
if (isset($this->inProgressMakes[$normalizedClass])) {
throw new InjectionException(
$this->inProgressMakes,
sprintf(
self::M_CYCLIC_DEPENDENCY,
$className
),
self::E_CYCLIC_DEPENDENCY
);
}
$this->inProgressMakes[$normalizedClass] = count($this->inProgressMakes);
// isset() is used specifically here because classes may be marked as "shared" before an
// instance is stored. In these cases the class is "shared," but it has a null value and
// instantiation is needed.
if (isset($this->shares[$normalizedClass])) {
unset($this->inProgressMakes[$normalizedClass]);
return $this->shares[$normalizedClass];
}
try {
if (isset($this->delegates[$normalizedClass])) {
$executable = $this->buildExecutable($this->delegates[$normalizedClass]);
$reflectionFunction = $executable->getCallableReflection();
$args = $this->provisionFuncArgs($reflectionFunction, $args, null, $className);
$obj = call_user_func_array(array($executable, '__invoke'), $args);
} else {
$obj = $this->provisionInstance($className, $normalizedClass, $args);
}
$obj = $this->prepareInstance($obj, $normalizedClass);
if (array_key_exists($normalizedClass, $this->shares)) {
$this->shares[$normalizedClass] = $obj;
}
unset($this->inProgressMakes[$normalizedClass]);
}
catch (\Throwable $exception) {
unset($this->inProgressMakes[$normalizedClass]);
throw $exception;
}
catch (\Exception $exception) {
unset($this->inProgressMakes[$normalizedClass]);
throw $exception;
}
return $obj;
}
private function provisionInstance($className, $normalizedClass, array $definition)
{
try {
$ctor = $this->reflector->getCtor($className);
if (!$ctor) {
$obj = $this->instantiateWithoutCtorParams($className);
} elseif (!$ctor->isPublic()) {
throw new InjectionException(
$this->inProgressMakes,
sprintf(self::M_NON_PUBLIC_CONSTRUCTOR, $className),
self::E_NON_PUBLIC_CONSTRUCTOR
);
} elseif ($ctorParams = $this->reflector->getCtorParams($className)) {
$reflClass = $this->reflector->getClass($className);
$definition = isset($this->classDefinitions[$normalizedClass])
? array_replace($this->classDefinitions[$normalizedClass], $definition)
: $definition;
$args = $this->provisionFuncArgs($ctor, $definition, $ctorParams, $className);
$obj = $reflClass->newInstanceArgs($args);
} else {
$obj = $this->instantiateWithoutCtorParams($className);
}
return $obj;
} catch (\ReflectionException $e) {
throw new InjectionException(
$this->inProgressMakes,
sprintf(self::M_MAKE_FAILURE, $className, $e->getMessage()),
self::E_MAKE_FAILURE,
$e
);
}
}
private function instantiateWithoutCtorParams($className)
{
$reflClass = $this->reflector->getClass($className);
if (!$reflClass->isInstantiable()) {
$type = $reflClass->isInterface() ? 'interface' : 'abstract class';
throw new InjectionException(
$this->inProgressMakes,
sprintf(self::M_NEEDS_DEFINITION, $type, $className),
self::E_NEEDS_DEFINITION
);
}
return new $className;
}
private function provisionFuncArgs(\ReflectionFunctionAbstract $reflFunc, array $definition, array $reflParams = null, $className = null)
{
$args = array();
// @TODO store this in ReflectionStorage
if (!isset($reflParams)) {
$reflParams = $reflFunc->getParameters();
}
foreach ($reflParams as $i => $reflParam) {
$name = $reflParam->name;
if (isset($definition[$i]) || array_key_exists($i, $definition)) {
// indexed arguments take precedence over named parameters
$arg = $definition[$i];
} elseif (isset($definition[$name]) || array_key_exists($name, $definition)) {
// interpret the param as a class name to be instantiated
$arg = $this->make($definition[$name]);
} elseif (($prefix = self::A_RAW . $name) && (isset($definition[$prefix]) || array_key_exists($prefix, $definition))) {
// interpret the param as a raw value to be injected
$arg = $definition[$prefix];
} elseif (($prefix = self::A_DELEGATE . $name) && isset($definition[$prefix])) {
// interpret the param as an invokable delegate
$arg = $this->buildArgFromDelegate($name, $definition[$prefix]);
} elseif (($prefix = self::A_DEFINE . $name) && isset($definition[$prefix])) {
// interpret the param as a class definition
$arg = $this->buildArgFromParamDefineArr($definition[$prefix]);
} elseif (!$arg = $this->buildArgFromTypeHint($reflFunc, $reflParam)) {
$arg = $this->buildArgFromReflParam($reflParam, $className);
if ($arg === null && PHP_VERSION_ID >= 50600 && $reflParam->isVariadic()) {
// buildArgFromReflParam might return null in case the parameter is optional
// in case of variadics, the parameter is optional, but null might not be allowed
continue;
}
}
$args[] = $arg;
}
return $args;
}
private function buildArgFromParamDefineArr($definition)
{
if (!is_array($definition)) {
throw new InjectionException(
$this->inProgressMakes
// @TODO Add message
);
}
if (!isset($definition[0], $definition[1])) {
throw new InjectionException(
$this->inProgressMakes
// @TODO Add message
);
}
list($class, $definition) = $definition;
return $this->make($class, $definition);
}
private function buildArgFromDelegate($paramName, $callableOrMethodStr)
{
if ($this->isExecutable($callableOrMethodStr) === false) {
throw InjectionException::fromInvalidCallable(
$this->inProgressMakes,
$callableOrMethodStr
);
}
$executable = $this->buildExecutable($callableOrMethodStr);
return $executable($paramName, $this);
}
private function buildArgFromTypeHint(\ReflectionFunctionAbstract $reflFunc, \ReflectionParameter $reflParam)
{
$typeHint = $this->reflector->getParamTypeHint($reflFunc, $reflParam);
if (!$typeHint) {
$obj = null;
} elseif ($reflParam->isDefaultValueAvailable()) {
$normalizedName = $this->normalizeName($typeHint);
// Injector has been told explicitly how to make this type
if (isset($this->aliases[$normalizedName]) ||
isset($this->delegates[$normalizedName]) ||
isset($this->shares[$normalizedName])) {
$obj = $this->make($typeHint);
} else {
$obj = $reflParam->getDefaultValue();
}
} else {
$obj = $this->make($typeHint);
}
return $obj;
}
private function buildArgFromReflParam(\ReflectionParameter $reflParam, $className = null)
{
if (array_key_exists($reflParam->name, $this->paramDefinitions)) {
$arg = $this->paramDefinitions[$reflParam->name];
} elseif ($reflParam->isDefaultValueAvailable()) {
$arg = $reflParam->getDefaultValue();
} elseif ($reflParam->isOptional()) {
// This branch is required to work around PHP bugs where a parameter is optional
// but has no default value available through reflection. Specifically, PDO exhibits
// this behavior.
$arg = null;
} else {
$reflFunc = $reflParam->getDeclaringFunction();
$classDeclare = ($reflFunc instanceof \ReflectionMethod)
? " declared in " . $reflFunc->getDeclaringClass()->name . "::"
: "";
$classWord = ($reflFunc instanceof \ReflectionMethod)
? $className . '::'
: '';
$funcWord = $classWord . $reflFunc->name;
throw new InjectionException(
$this->inProgressMakes,
sprintf(
self::M_UNDEFINED_PARAM,
$reflParam->name,
$reflParam->getPosition(),
$funcWord,
$classDeclare
),
self::E_UNDEFINED_PARAM
);
}
return $arg;
}
private function prepareInstance($obj, $normalizedClass)
{
if (isset($this->prepares[$normalizedClass])) {
$prepare = $this->prepares[$normalizedClass];
$executable = $this->buildExecutable($prepare);
$result = $executable($obj, $this);
if ($result instanceof $normalizedClass) {
$obj = $result;
}
}
$interfaces = @class_implements($obj);
if ($interfaces === false) {
throw new InjectionException(
$this->inProgressMakes,
sprintf(
self::M_MAKING_FAILED,
$normalizedClass,
gettype($obj)
),
self::E_MAKING_FAILED
);
}
if (empty($interfaces)) {
return $obj;
}
$interfaces = array_flip(array_map(array($this, 'normalizeName'), $interfaces));
$prepares = array_intersect_key($this->prepares, $interfaces);
foreach ($prepares as $interfaceName => $prepare) {
$executable = $this->buildExecutable($prepare);
$result = $executable($obj, $this);
if ($result instanceof $normalizedClass) {
$obj = $result;
}
}
return $obj;
}
/**
* Invoke the specified callable or class::method string, provisioning dependencies along the way
*
* @param mixed $callableOrMethodStr A valid PHP callable or a provisionable ClassName::methodName string
* @param array $args Optional array specifying params with which to invoke the provisioned callable
* @throws \Auryn\InjectionException
* @return mixed Returns the invocation result returned from calling the generated executable
*/
public function execute($callableOrMethodStr, array $args = array())
{
list($reflFunc, $invocationObj) = $this->buildExecutableStruct($callableOrMethodStr);
$executable = new Executable($reflFunc, $invocationObj);
$args = $this->provisionFuncArgs($reflFunc, $args, null, $invocationObj === null ? null : get_class($invocationObj));
return call_user_func_array(array($executable, '__invoke'), $args);
}
/**
* Provision an Executable instance from any valid callable or class::method string
*
* @param mixed $callableOrMethodStr A valid PHP callable or a provisionable ClassName::methodName string
* @return \Auryn\Executable
*/
public function buildExecutable($callableOrMethodStr)
{
try {
list($reflFunc, $invocationObj) = $this->buildExecutableStruct($callableOrMethodStr);
} catch (\ReflectionException $e) {
throw InjectionException::fromInvalidCallable(
$this->inProgressMakes,
$callableOrMethodStr,
$e
);
}
return new Executable($reflFunc, $invocationObj);
}
private function buildExecutableStruct($callableOrMethodStr)
{
if (is_string($callableOrMethodStr)) {
$executableStruct = $this->buildExecutableStructFromString($callableOrMethodStr);
} elseif ($callableOrMethodStr instanceof \Closure) {
$callableRefl = new \ReflectionFunction($callableOrMethodStr);
$executableStruct = array($callableRefl, null);
} elseif (is_object($callableOrMethodStr) && is_callable($callableOrMethodStr)) {
$invocationObj = $callableOrMethodStr;
$callableRefl = $this->reflector->getMethod($invocationObj, '__invoke');
$executableStruct = array($callableRefl, $invocationObj);
} elseif (is_array($callableOrMethodStr)
&& isset($callableOrMethodStr[0], $callableOrMethodStr[1])
&& count($callableOrMethodStr) === 2
) {
$executableStruct = $this->buildExecutableStructFromArray($callableOrMethodStr);
} else {
throw InjectionException::fromInvalidCallable(
$this->inProgressMakes,
$callableOrMethodStr
);
}
return $executableStruct;
}
private function buildExecutableStructFromString($stringExecutable)
{
if (function_exists($stringExecutable)) {
$callableRefl = $this->reflector->getFunction($stringExecutable);
$executableStruct = array($callableRefl, null);
} elseif (method_exists($stringExecutable, '__invoke')) {
$invocationObj = $this->make($stringExecutable);
$callableRefl = $this->reflector->getMethod($invocationObj, '__invoke');
$executableStruct = array($callableRefl, $invocationObj);
} elseif (strpos($stringExecutable, '::') !== false) {
list($class, $method) = explode('::', $stringExecutable, 2);
$executableStruct = $this->buildStringClassMethodCallable($class, $method);
} else {
throw InjectionException::fromInvalidCallable(
$this->inProgressMakes,
$stringExecutable
);
}
return $executableStruct;
}
private function buildStringClassMethodCallable($class, $method)
{
$relativeStaticMethodStartPos = strpos($method, 'parent::');
if ($relativeStaticMethodStartPos === 0) {
$childReflection = $this->reflector->getClass($class);
$class = $childReflection->getParentClass()->name;
$method = substr($method, $relativeStaticMethodStartPos + 8);
}
list($className, $normalizedClass) = $this->resolveAlias($class);
$reflectionMethod = $this->reflector->getMethod($className, $method);
if ($reflectionMethod->isStatic()) {
return array($reflectionMethod, null);
}
$instance = $this->make($className);
// If the class was delegated, the instance may not be of the type
// $class but some other type. We need to get the reflection on the
// actual class to be able to call the method correctly.
$reflectionMethod = $this->reflector->getMethod($instance, $method);
return array($reflectionMethod, $instance);
}
private function buildExecutableStructFromArray($arrayExecutable)
{
list($classOrObj, $method) = $arrayExecutable;
if (is_object($classOrObj) && method_exists($classOrObj, $method)) {
$callableRefl = $this->reflector->getMethod($classOrObj, $method);
$executableStruct = array($callableRefl, $classOrObj);
} elseif (is_string($classOrObj)) {
$executableStruct = $this->buildStringClassMethodCallable($classOrObj, $method);
} else {
throw InjectionException::fromInvalidCallable(
$this->inProgressMakes,
$arrayExecutable
);
}
return $executableStruct;
}
}