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<?php
class FunctionTemplateSyntaxElement extends AbstractTemplateSyntaxElement
{
public static function is_element(StringInputStream $input)
{
return $input->assert_next('\s*(?:\w+::)?\w+\(\s*');
}
public function parse(TemplateSyntaxParserContext $context, StringInputStream $input, StringOutputStream $output)
{
$this->register($context, $input, $output);
$matches = array();
if ($input->consume_next('(?:(?P<class>\w+)::)?(?P<method>\w+)\(', '', $matches))
{
$class = $matches['class'];
$method = $matches['method'];
$this->check_method_call($class, $method);
$this->write($class, $method);
$this->parameters();
$this->end();
}
else
{
throw new TemplateRenderingException('invalid function call', $input);
}
}
private function check_method_call($class, $method)
{
if (empty($class))
{
if (!method_exists('TemplateFunctions', $method))
{
throw new TemplateRenderingException('Unauthorized method call. Only ' . implode(', ', get_class_methods('TemplateFunctions')) .
' functions calls and static methods calls are allowed', $this->input);
}
}
elseif ($this->is_php_function($class))
{
if (!function_exists($method))
{
throw new TemplateRenderingException('PHP function ' . $method . '() does not exist', $this->input);
}
}
elseif (!method_exists($class, $method))
{
throw new TemplateRenderingException('Static method ' . $class . '::' . $method . '() does not exist', $this->input);
}
}
private function write($class, $method)
{
if (!empty($class))
{
if (!$this->is_php_function($class))
{
$this->output->write($class . '::');
}
}
else
{
$this->output->write(TemplateSyntaxElement::FUNCTIONS . '->');
}
$this->output->write($method . '(');
}
private function parameters()
{
$this->parse_elt(new ParametersTemplateSyntaxElement());
}
private function end()
{
if (!$this->input->consume_next('\)'))
{
throw new TemplateRenderingException('invalid function call: missing enclosing parenthesis', $this->input);
}
$this->output->write(')');
}
private function is_php_function($prefix)
{
return TextHelper::strtoupper($prefix) == 'PHP';
}
}
class InvalidTemplateFunctionCallException extends TemplateRenderingException {}
?>