/**
* Will generate the skeleton code for the passed function definition.
* Will result in a string resembling the following example:
*
* <FUNCTION_DOCBLOCK>
* <FUNCTION_MODIFIERS> function <FUNCTION_NAME>(<FUNCTION_PARAMS>)
* {
* $dgStartLine = <FUNCTION_START_LINE>;
* $dgEndLine = <FUNCTION_END_LINE>;
* / DOPPELGAENGER_FUNCTION_BEGIN_PLACEHOLDER <FUNCTION_NAME> /
* / DOPPELGAENGER_BEFORE_JOINPOINT <FUNCTION_NAME> /
* $dgOngoingContract = \AppserverIo\Doppelgaenger\ContractContext::open();
* / DOPPELGAENGER_INVARIANT_PLACEHOLDER /
* / DOPPELGAENGER_PRECONDITION_PLACEHOLDER <FUNCTION_NAME> /
* / DOPPELGAENGER_OLD_SETUP_PLACEHOLDER <FUNCTION_NAME> /
* $dgResult = null;
* try {
* / DOPPELGAENGER_AROUND_JOINPOINT <FUNCTION_NAME> /
*
* } catch (\Exception $dgThrownExceptionObject) {
* / DOPPELGAENGER_AFTERTHROWING_JOINPOINT <FUNCTION_NAME> /
*
* // rethrow the exception
* throw $dgThrownExceptionObject;
*
* } finally {
* / DOPPELGAENGER_AFTER_JOINPOINT <FUNCTION_NAME> /
*
* }
* / DOPPELGAENGER_POSTCONDITION_PLACEHOLDER <FUNCTION_NAME> /
* / DOPPELGAENGER_INVARIANT_PLACEHOLDER /
* if ($dgOngoingContract) {
* \AppserverIo\Doppelgaenger\ContractContext::close();
* } / DOPPELGAENGER_AFTERRETURNING_JOINPOINT <FUNCTION_NAME> /
*
* return $dgResult;
* }
*
* @param boolean $injectNeeded Determine if we have to use a try...catch block
* @param FunctionDefinition $functionDefinition The function definition object
*
* @return string
*/
protected function generateSkeletonCode($injectNeeded, FunctionDefinition $functionDefinition)
{
// first of all: the docblock
$code = '
' . $functionDefinition->getDocBlock() . '
' . $functionDefinition->getHeader('definition') . '
{
' . ReservedKeywords::START_LINE_VARIABLE . ' = ' . (int) $functionDefinition->getStartLine() . ';
' . ReservedKeywords::END_LINE_VARIABLE . ' = ' . (int) $functionDefinition->getEndLine() . ';
' . Placeholders::FUNCTION_BEGIN . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE . '
';
// right after: the "before" join-point
$code .= Placeholders::BEFORE_JOINPOINT . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE . '
';
// open the contract context so we are able to avoid endless recursion
$code .= ReservedKeywords::CONTRACT_CONTEXT . ' = \\AppserverIo\\Doppelgaenger\\ContractContext::open();
';
// Invariant is not needed in private or static functions.
// Also make sure that there is none in front of the constructor check
if ($functionDefinition->getVisibility() !== 'private' && !$functionDefinition->isStatic() && $functionDefinition->getName() !== '__construct') {
$code .= Placeholders::INVARIANT_CALL_START . '
';
}
$code .= Placeholders::PRECONDITION . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE . '
' . Placeholders::OLD_SETUP . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE . '
';
// we will wrap code execution in order to provide a "finally" and "after throwing" placeholder hook.
// we will also predefine the result as NULL to avoid warnings
$code .= ReservedKeywords::RESULT . ' = null;
try {
' . Placeholders::AROUND_JOINPOINT . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE . '
';
// add the second part of the try/catch/finally block
$code .= '
} catch (\\Exception ' . ReservedKeywords::THROWN_EXCEPTION_OBJECT . ') {
' . Placeholders::AFTERTHROWING_JOINPOINT . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE . '
// rethrow the exception
throw ' . ReservedKeywords::THROWN_EXCEPTION_OBJECT . ';
} finally {
';
// if we have to inject additional code, we might do so here
if ($injectNeeded === true) {
$code .= Placeholders::METHOD_INJECT . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE;
}
// finish of the block
$code .= ' ' . Placeholders::AFTER_JOINPOINT . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE . '
}
';
// now just place all the other placeholder for other filters to come
$code .= ' ' . Placeholders::POSTCONDITION . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE;
// Invariant is not needed in private or static functions
if ($functionDefinition->getVisibility() !== 'private' && !$functionDefinition->isStatic()) {
$code .= '
' . Placeholders::INVARIANT_CALL_END . '
';
}
// close of the contract context
$code .= 'if (' . ReservedKeywords::CONTRACT_CONTEXT . ') {
\\AppserverIo\\Doppelgaenger\\ContractContext::close();
}
';
// last of all: the "after returning" join-point and the final return from the proxy
$code .= ' ' . Placeholders::AFTERRETURNING_JOINPOINT . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE . '
return ' . ReservedKeywords::RESULT . ';
}
';
return $code;
}
/**
* Will change code to create an entry for the old object state.
*
* @param string $bucketData Payload of the currently
* filtered bucket
* @param \AppserverIo\Doppelgaenger\Entities\Definitions\FunctionDefinition $functionDefinition Currently handled function
*
* @throws \AppserverIo\Doppelgaenger\Exceptions\GeneratorException
*
* @return boolean
*/
protected function injectOldCode(&$bucketData, FunctionDefinition &$functionDefinition)
{
// Do we even need to do anything?
if ($functionDefinition->usesOld() !== true) {
return false;
}
// If the function is static it should not use the dgOld keyword as there is no state to the class!
if ($functionDefinition->isStatic() === true) {
throw new GeneratorException(sprintf('Cannot clone class state in static method %s.', $functionDefinition->getName()));
}
// Still here? Then inject the clone statement to preserve an instance of the object prior to our call.
$bucketData = str_replace(Placeholders::OLD_SETUP . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE, ReservedKeywords::OLD . ' = clone $this;', $bucketData);
// Still here? We encountered no error then.
return true;
}
/**
* Will inject invocation code for a given function into a given piece of code.
* Invocation code will be the instantiation of a \AppserverIo\Doppelgaenger\Entities\MethodInvocation object
* as a basic representation of the given function
*
* @param string $bucketData Reference on the current bucket's data
* @param FunctionDefinition $functionDefinition Definition of the function to inject invocation code into
* @param array $callbackChain Chain of callbacks which is used to recursively chain calls
*
* @return boolean
*/
protected function injectInvocationCode(&$bucketData, FunctionDefinition $functionDefinition, array $callbackChain)
{
// start building up the code
$code = '
' . ReservedKeywords::METHOD_INVOCATION_OBJECT . ' = new \\AppserverIo\\Doppelgaenger\\Entities\\MethodInvocation(
';
// add the original method call to the callback chain so it can be integrated, add it and add the context
if ($functionDefinition->isStatic()) {
$contextCode = '__CLASS__';
} else {
$contextCode = '$this';
}
// iterate the callback chain and build up the code but pop the first element as we will invoke it initially
unset($callbackChain[0]);
// empty chain? Add the original function at least
if (empty($callbackChain)) {
$callbackChain[] = array($functionDefinition->getStructureName(), $functionDefinition->getName());
}
$code .= ' array(';
foreach ($callbackChain as $callback) {
// do some brushing up for the structure
$structure = $callback[0];
if ($structure === $functionDefinition->getStructureName()) {
$structure = $contextCode;
}
// also brush up the function call to direct to the original
if ($callback[1] === $functionDefinition->getName()) {
$callback[1] = $functionDefinition->getName() . ReservedKeywords::ORIGINAL_FUNCTION_SUFFIX;
}
$code .= 'array(' . $structure . ', \'' . $callback[1] . '\'),';
}
$code .= '),
';
// continue with the access modifiers
$code .= ' ' . $contextCode . ',
' . ($functionDefinition->isAbstract() ? 'true' : 'false') . ',
' . ($functionDefinition->isFinal() ? 'true' : 'false') . ',
' . ($functionDefinition->isStatic() ? 'true' : 'false') . ',
';
// we have to build up manual parameter collection as func_get_args() only returns copies
// @see http://php.net/manual/en/function.func-get-args.php
$parametersCode = ' array(';
foreach ($functionDefinition->getParameterDefinitions() as $parameterDefinition) {
$name = $parameterDefinition->name;
$parametersCode .= '\'' . substr($name, 1) . '\' => ' . $name . ',';
}
$parametersCode .= ')';
$code .= ' \'' . $functionDefinition->getName() . '\',
' . $parametersCode . ',
__CLASS__,
\'' . $functionDefinition->getVisibility() . '\'
);';
// Insert the code
$placeholder = Placeholders::FUNCTION_BEGIN . $functionDefinition->getName() . Placeholders::PLACEHOLDER_CLOSE;
$bucketData = str_replace($placeholder, $placeholder . $code, $bucketData);
return true;
}
