//
// TAL Specifications 1.4
//
// argument ::= expression
//
// Example:
//
// (c) 2000
//
//
require_once PHPTAL_DIR.'PHPTAL/Php/Attribute.php';
require_once PHPTAL_DIR.'PHPTAL/Php/TalesChainExecutor.php';
/**
* @package phptal.php.attribute.tal
* @author Laurent Bedubourg
*/
class PHPTAL_Php_Attribute_TAL_Condition
extends PHPTAL_Php_Attribute
implements PHPTAL_Php_TalesChainReader
{
private $expressions = array();
public function start()
{
$code = $this->tag->generator->evaluateExpression($this->expression);
// If it's a chained expression build a new code path
if (is_array($code)) {
$this->expressions = array();
$executor = new PHPTAL_Php_TalesChainExecutor( $this->tag->generator, $code, $this );
return;
}
// Force a falsy condition if the nothing keyword is active
if ($code == PHPTAL_TALES_NOTHING_KEYWORD) {
$code = 'false';
}
$this->tag->generator->doIf($code);
}
public function end()
{
$this->tag->generator->doEnd();
}
public function talesChainPart(PHPTAL_Php_TalesChainExecutor $executor, $exp, $islast)
{
// check if the expression is empty
if ( $exp !== 'false' ) {
$this->expressions[] = '!phptal_isempty($__content__ = ' . $exp . ')';
}
if ( $islast ) {
// for the last one in the chain build a ORed condition
$this->tag->generator->doIf( implode(' || ', $this->expressions ) );
// The executor will always end an if so we output a dummy if
$executor->doIf('false');
}
}
public function talesChainNothingKeyword(PHPTAL_Php_TalesChainExecutor $executor)
{
// end the chain
$this->talesChainPart( $executor, 'false', true );
$executor->breakChain();
}
public function talesChainDefaultKeyword(PHPTAL_Php_TalesChainExecutor $executor)
{
throw new PHPTAL_Exception('\'default\' keyword not allowed on condition expressions');
}
}