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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 ::= attribute_statement [';' attribute_statement]*
* attribute_statement ::= attribute_name expression
* attribute_name ::= [namespace ':'] Name
* namespace ::= Name
*
* examples:
*
* <a href="/sample/link.html"
* tal:attributes="href here/sub/absolute_url">
* <textarea rows="80" cols="20"
* tal:attributes="rows request/rows;cols request/cols">
*
* IN PHPTAL: attributes will not work on structured replace.
*
* @package PHPTAL
* @subpackage Php.attribute.tal
* @author Laurent Bedubourg <lbedubourg@motion-twin.com>
*/
class PHPTAL_Php_Attribute_TAL_Attributes
extends PHPTAL_Php_Attribute
implements PHPTAL_Php_TalesChainReader
{
/** before creates several variables that need to be freed in after */
private $vars_to_recycle = array();
/**
* value for default keyword
*/
private $_default_escaped;
public function before(PHPTAL_Php_CodeWriter $codewriter)
{
// split attributes using ; delimiter
$attrs = $codewriter->splitExpression($this->expression);
foreach ($attrs as $exp) {
list($qname, $expression) = $this->parseSetExpression($exp);
if ($expression) {
$this->prepareAttribute($codewriter, $qname, $expression);
}
}
}
private function prepareAttribute(PHPTAL_Php_CodeWriter $codewriter, $qname, $expression)
{
$tales_code = $this->extractEchoType($expression);
$code = $codewriter->evaluateExpression($tales_code);
// XHTML boolean attribute does not appear when empty or false
if (PHPTAL_Dom_Defs::getInstance()->isBooleanAttribute($qname)) {
// I don't want to mix code for boolean with chained executor
// so compile it again to simple expression
if (is_array($code)) {
$code = PHPTAL_Php_TalesInternal::compileToPHPExpression($tales_code);
}
return $this->prepareBooleanAttribute($codewriter, $qname, $code);
}
// if $code is an array then the attribute value is decided by a
// tales chained expression
if (is_array($code)) {
return $this->prepareChainedAttribute($codewriter, $qname, $code);
}
// i18n needs to read replaced value of the attribute, which is not possible if attribute is completely replaced with conditional code
if ($this->phpelement->hasAttributeNS('http://xml.zope.org/namespaces/i18n', 'attributes')) {
$this->prepareAttributeUnconditional($codewriter, $qname, $code);
} else {
$this->prepareAttributeConditional($codewriter, $qname, $code);
}
}
/**
* attribute will be output regardless of its evaluated value. NULL behaves just like "".
*/
private function prepareAttributeUnconditional(PHPTAL_Php_CodeWriter $codewriter, $qname, $code)
{
// regular attribute which value is the evaluation of $code
$attkey = $this->getVarName($qname, $codewriter);
if ($this->_echoType == PHPTAL_Php_Attribute::ECHO_STRUCTURE) {
$value = $codewriter->stringifyCode($code);
} else {
$value = $codewriter->escapeCode($code);
}
$codewriter->doSetVar($attkey, $value);
$this->phpelement->getOrCreateAttributeNode($qname)->overwriteValueWithVariable($attkey);
}
/**
* If evaluated value of attribute is NULL, it will not be output at all.
*/
private function prepareAttributeConditional(PHPTAL_Php_CodeWriter $codewriter, $qname, $code)
{
// regular attribute which value is the evaluation of $code
$attkey = $this->getVarName($qname, $codewriter);
$codewriter->doIf("null !== ($attkey = ($code))");
if ($this->_echoType !== PHPTAL_Php_Attribute::ECHO_STRUCTURE)
$codewriter->doSetVar($attkey, $codewriter->str(" $qname=\"").".".$codewriter->escapeCode($attkey).".'\"'");
else
$codewriter->doSetVar($attkey, $codewriter->str(" $qname=\"").".".$codewriter->stringifyCode($attkey).".'\"'");
$codewriter->doElse();
$codewriter->doSetVar($attkey, "''");
$codewriter->doEnd('if');
$this->phpelement->getOrCreateAttributeNode($qname)->overwriteFullWithVariable($attkey);
}
private function prepareChainedAttribute(PHPTAL_Php_CodeWriter $codewriter, $qname, $chain)
{
$this->_default_escaped = false;
$this->_attribute = $qname;
if ($default_attr = $this->phpelement->getAttributeNode($qname)) {
$this->_default_escaped = $default_attr->getValueEscaped();
}
$this->_attkey = $this->getVarName($qname, $codewriter);
$executor = new PHPTAL_Php_TalesChainExecutor($codewriter, $chain, $this);
$this->phpelement->getOrCreateAttributeNode($qname)->overwriteFullWithVariable($this->_attkey);
}
private function prepareBooleanAttribute(PHPTAL_Php_CodeWriter $codewriter, $qname, $code)
{
$attkey = $this->getVarName($qname, $codewriter);
if ($codewriter->getOutputMode() === PHPTAL::HTML5) {
$value = "' $qname'";
} else {
$value = "' $qname=\"$qname\"'";
}
$codewriter->doIf($code);
$codewriter->doSetVar($attkey, $value);
$codewriter->doElse();
$codewriter->doSetVar($attkey, '\'\'');
$codewriter->doEnd('if');
$this->phpelement->getOrCreateAttributeNode($qname)->overwriteFullWithVariable($attkey);
}
private function getVarName($qname, PHPTAL_Php_CodeWriter $codewriter)
{
$var = $codewriter->createTempVariable();
$this->vars_to_recycle[] = $var;
return $var;
}
public function after(PHPTAL_Php_CodeWriter $codewriter)
{
foreach ($this->vars_to_recycle as $var) $codewriter->recycleTempVariable($var);
}
public function talesChainNothingKeyword(PHPTAL_Php_TalesChainExecutor $executor)
{
$codewriter = $executor->getCodeWriter();
$executor->doElse();
$codewriter->doSetVar(
$this->_attkey,
"''"
);
$executor->breakChain();
}
public function talesChainDefaultKeyword(PHPTAL_Php_TalesChainExecutor $executor)
{
$codewriter = $executor->getCodeWriter();
$executor->doElse();
$attr_str = ($this->_default_escaped !== false)
? ' '.$this->_attribute.'='.$codewriter->quoteAttributeValue($this->_default_escaped) // default value
: ''; // do not print attribute
$codewriter->doSetVar($this->_attkey, $codewriter->str($attr_str));
$executor->breakChain();
}
public function talesChainPart(PHPTAL_Php_TalesChainExecutor $executor, $exp, $islast)
{
$codewriter = $executor->getCodeWriter();
if (!$islast) {
$condition = "!phptal_isempty($this->_attkey = ($exp))";
} else {
$condition = "null !== ($this->_attkey = ($exp))";
}
$executor->doIf($condition);
if ($this->_echoType == PHPTAL_Php_Attribute::ECHO_STRUCTURE)
$value = $codewriter->stringifyCode($this->_attkey);
else
$value = $codewriter->escapeCode($this->_attkey);
$codewriter->doSetVar($this->_attkey, $codewriter->str(" {$this->_attribute}=\"").".$value.'\"'");
}
}
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