/**
* Convert a single ViewHelperNode into its cached representation. If the ViewHelper implements the "Compilable" facet,
* the ViewHelper itself is asked for its cached PHP code representation. If not, a ViewHelper is built and then invoked.
*
* @param ViewHelperNode $node
* @return array
* @see convert()
*/
protected function convertViewHelperNode(ViewHelperNode $node)
{
$initializationPhpCode = '// Rendering ViewHelper ' . $node->getViewHelperClassName() . chr(10);
// Build up $arguments array
$argumentsVariableName = $this->variableName('arguments');
$initializationPhpCode .= sprintf('%s = array();', $argumentsVariableName) . chr(10);
$alreadyBuiltArguments = array();
foreach ($node->getArguments() as $argumentName => $argumentValue) {
if ($argumentValue instanceof NodeInterface) {
$converted = $this->convert($argumentValue);
} else {
$converted = array('initialization' => '', 'execution' => $argumentValue);
}
$initializationPhpCode .= $converted['initialization'];
$initializationPhpCode .= sprintf('%s[\'%s\'] = %s;', $argumentsVariableName, $argumentName, $converted['execution']) . chr(10);
$alreadyBuiltArguments[$argumentName] = TRUE;
}
$arguments = $node->getArgumentDefinitions();
foreach ($arguments as $argumentName => $argumentDefinition) {
if (!isset($alreadyBuiltArguments[$argumentName])) {
$initializationPhpCode .= sprintf('%s[\'%s\'] = %s;', $argumentsVariableName, $argumentName, var_export($argumentDefinition->getDefaultValue(), TRUE)) . chr(10);
}
}
// Build up closure which renders the child nodes
$renderChildrenClosureVariableName = $this->variableName('renderChildrenClosure');
$initializationPhpCode .= sprintf('%s = %s;', $renderChildrenClosureVariableName, $this->templateCompiler->wrapChildNodesInClosure($node)) . chr(10);
$viewHelperInitializationPhpCode = '';
$convertedViewHelperExecutionCode = $node->getUninitializedViewHelper()->compile($argumentsVariableName, $renderChildrenClosureVariableName, $viewHelperInitializationPhpCode, $node, $this->templateCompiler);
$initializationPhpCode .= $viewHelperInitializationPhpCode;
$initializationArray = array('initialization' => $initializationPhpCode, 'execution' => $convertedViewHelperExecutionCode);
return $initializationArray;
}
/**
* The compiled ViewHelper adds two new ViewHelper arguments: __thenClosure and __elseClosure.
* These contain closures which are be executed to render the then(), respectively else() case.
*
* @param string $argumentsName
* @param string $closureName
* @param string $initializationPhpCode
* @param ViewHelperNode $node
* @param TemplateCompiler $compiler
* @return string
*/
public function compile($argumentsName, $closureName, &$initializationPhpCode, ViewHelperNode $node, TemplateCompiler $compiler)
{
$thenViewHelperEncountered = $elseViewHelperEncountered = FALSE;
foreach ($node->getChildNodes() as $childNode) {
if ($childNode instanceof ViewHelperNode) {
$viewHelperClassName = $childNode->getViewHelperClassName();
if (substr($viewHelperClassName, -14) === 'ThenViewHelper') {
$thenViewHelperEncountered = TRUE;
$childNodesAsClosure = $compiler->wrapChildNodesInClosure($childNode);
$initializationPhpCode .= sprintf('%s[\'__thenClosure\'] = %s;', $argumentsName, $childNodesAsClosure) . chr(10);
} elseif (substr($viewHelperClassName, -14) === 'ElseViewHelper') {
$elseViewHelperEncountered = TRUE;
$childNodesAsClosure = $compiler->wrapChildNodesInClosure($childNode);
$initializationPhpCode .= sprintf('%s[\'__elseClosures\'][] = %s;', $argumentsName, $childNodesAsClosure) . chr(10);
$arguments = $childNode->getArguments();
if (isset($arguments['if'])) {
// The "else" has an argument, indicating it has a secondary (elseif) condition.
// Compile a closure which will evaluate the condition.
$elseIfConditionAsClosure = $compiler->wrapViewHelperNodeArgumentEvaluationInClosure($childNode, 'if');
$initializationPhpCode .= sprintf('%s[\'__elseifClosures\'][] = %s;', $argumentsName, $elseIfConditionAsClosure) . chr(10);
}
}
}
}
if (!$thenViewHelperEncountered && !$elseViewHelperEncountered && !isset($node->getArguments()['then'])) {
$initializationPhpCode .= sprintf('%s[\'__thenClosure\'] = %s;', $argumentsName, $closureName) . chr(10);
}
return parent::compile($argumentsName, $closureName, $initializationPhpCode, $node, $compiler);
}