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<?php
/**
* PHPTAL templating engine
*
* PHP Version 5
*
* @category HTML
* @package PHPTAL
* @author Laurent Bedubourg <lbedubourg@motion-twin.com>
* @author Kornel Lesiński <kornel@aardvarkmedia.co.uk>
* @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License
* @version SVN: $Id$
* @link http://phptal.org/
*/
/**
* TAL Specifications 1.4
*
* argument ::= (['text'] | 'structure') expression
*
* Default behaviour : text
*
* <span tal:replace="template/title">Title</span>
* <span tal:replace="text template/title">Title</span>
* <span tal:replace="structure table" />
* <span tal:replace="nothing">This element is a comment.</span>
*
*
*
* @package PHPTAL
* @subpackage Php.attribute.tal
* @author Laurent Bedubourg <lbedubourg@motion-twin.com>
*/
class PHPTAL_Php_Attribute_TAL_Replace
extends PHPTAL_Php_Attribute
implements PHPTAL_Php_TalesChainReader
{
public function before(PHPTAL_Php_CodeWriter $codewriter)
{
// tal:replace="" => do nothing and ignore node
if (trim($this->expression) == "") {
return;
}
$expression = $this->extractEchoType($this->expression);
$code = $codewriter->evaluateExpression($expression);
// chained expression
if (is_array($code)) {
return $this->replaceByChainedExpression($codewriter, $code);
}
// nothing do nothing
if ($code == PHPTAL_Php_TalesInternal::NOTHING_KEYWORD) {
return;
}
// default generate default tag content
if ($code == PHPTAL_Php_TalesInternal::DEFAULT_KEYWORD) {
return $this->generateDefault($codewriter);
}
// replace tag with result of expression
$this->doEchoAttribute($codewriter, $code);
}
public function after(PHPTAL_Php_CodeWriter $codewriter)
{
}
/**
* support expressions like "foo | bar"
*/
private function replaceByChainedExpression(PHPTAL_Php_CodeWriter $codewriter, $expArray)
{
$executor = new PHPTAL_Php_TalesChainExecutor(
$codewriter, $expArray, $this
);
}
public function talesChainNothingKeyword(PHPTAL_Php_TalesChainExecutor $executor)
{
$executor->continueChain();
}
public function talesChainDefaultKeyword(PHPTAL_Php_TalesChainExecutor $executor)
{
$executor->doElse();
$this->generateDefault($executor->getCodeWriter());
$executor->breakChain();
}
public function talesChainPart(PHPTAL_Php_TalesChainExecutor $executor, $exp, $islast)
{
if (!$islast) {
$var = $executor->getCodeWriter()->createTempVariable();
$executor->doIf('!phptal_isempty('.$var.' = '.$exp.')');
$this->doEchoAttribute($executor->getCodeWriter(), $var);
$executor->getCodeWriter()->recycleTempVariable($var);
} else {
$executor->doElse();
$this->doEchoAttribute($executor->getCodeWriter(), $exp);
}
}
/**
* don't replace - re-generate default content
*/
private function generateDefault(PHPTAL_Php_CodeWriter $codewriter)
{
$this->phpelement->generateSurroundHead($codewriter);
$this->phpelement->generateHead($codewriter);
$this->phpelement->generateContent($codewriter);
$this->phpelement->generateFoot($codewriter);
$this->phpelement->generateSurroundFoot($codewriter);
}
}
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