/**
* Tries to extract a single attribute, using the specified value type.
*
* @final
* @internal
* @param Opt_Xml_Element $item The scanned XML element.
* @param Opt_Xml_Attribute $attr The parsed attribute
* @param Int $type The requested value type.
* @return Mixed The extracted attribute value
*/
private final function _extractAttribute(Opt_Xml_Element $item, Opt_Xml_Attribute $attr, $type, $exprType = null)
{
$value = (string) $attr;
switch ($type) {
// An identifier, but with empty values allowed.
case self::ID_EMP:
if ($value == '') {
return $value;
}
// An identifier
// An identifier
case self::ID:
if (!preg_match('/^[a-zA-Z0-9\\_\\.]+$/', $value)) {
throw new Opt_InvalidAttributeType_Exception($attr->getXmlName(), $item->getXmlName(), 'identifier');
}
return $value;
// A number
// A number
case self::NUMBER:
if (!preg_match('/^\\-?([0-9]+\\.?[0-9]*)|(0[xX][0-9a-fA-F]+)$/', $value)) {
throw new Opt_InvalidAttributeType_Exception($attr->getXmlName(), $item->getXmlName(), 'number');
}
return $value;
// Boolean value: "yes" or "no"
// Boolean value: "yes" or "no"
case self::BOOL:
if ($value != 'yes' && $value != 'no') {
throw new Opt_InvalidAttributeType_Exception($attr->getXmlName(), $item->getXmlName(), '"yes" or "no"');
}
return $value == 'yes';
// A string packed into PHP expression. Can be switched to EXPRESSION.
// A string packed into PHP expression. Can be switched to EXPRESSION.
case self::STRING:
return $value;
break;
// An OPT expression.
// An OPT expression.
case self::EXPRESSION:
case self::ASSIGN_EXPR:
if (strlen(trim($value)) == 0) {
throw new Opt_AttributeEmpty_Exception($attr->getXmlName(), $item->getXmlName());
}
if (preg_match('/^([a-zA-Z0-9\\_]{2,})\\:([^\\:].*)$/', $value, $found)) {
$result = $this->_compiler->parseExpression($found[2], $found[1]);
} else {
$result = $this->_compiler->parseExpression($value, $exprType);
}
if ($result['type'] == Opt_Expression_Interface::ASSIGNMENT && $type != self::ASSIGN_EXPR) {
Opt_ExpressionOptionDisabled_Exception('Assignments', 'compiler requirements');
}
return $result['bare'];
}
}
/**
* This function is executed by the compiler during the second compilation stage,
* processing.
*/
public function preProcess(Opt_Compiler_Class $compiler)
{
$this->set('hidden', false);
// Empty expressions will be caught by the try... catch.
try {
$result = $compiler->parseExpression((string) $this);
switch ($result['type']) {
case Opt_Expression_Interface::ASSIGNMENT:
$this->addAfter(Opt_Xml_Buffer::TAG_BEFORE, $result['bare'] . '; ');
break;
case Opt_Expression_Interface::SCALAR:
if ($result['escaping'] == false) {
$this->addAfter(Opt_Xml_Buffer::TAG_BEFORE, $result['bare']);
$this->set('nophp', true);
break;
}
// TODO: Add escaping for scalar values.
// TODO: Add escaping for scalar values.
default:
$this->addAfter(Opt_Xml_Buffer::TAG_BEFORE, 'echo ' . $result['escaped'] . '; ');
}
} catch (Opt_EmptyExpression_Exception $e) {
}
}
