private function parseNodeAttributes(DOMNode &$node)
{
if ($node->hasAttributes()) {
foreach ($node->attributes as $attr) {
if (strpos($attr->value, '${') !== false) {
$expressions = array();
preg_match_all('/(\\$\\{)(.*)(\\})/imsxU', $attr->value, $expressions);
for ($i = 0; $i < count($expressions[0]); $i++) {
$toReplace = $expressions[0][$i];
$expression = $expressions[2][$i];
$expressionResult = ExpressionParser::evaluate($expression, $this->dataContext);
switch (strtolower($attr->name)) {
case 'repeat':
// Can only loop if the result of the expression was an array
if (!is_array($expressionResult)) {
throw new ExpressionException("Can't repeat on a singular var");
}
// Make sure the repeat variable doesn't show up in the cloned nodes (otherwise it would infinit recurse on this->parseNode())
$node->removeAttribute('repeat');
// Is a named var requested?
$variableName = $node->getAttribute('var') ? trim($node->getAttribute('var')) : false;
// Store the current 'Cur', index and count state, we might be in a nested repeat loop
$previousCount = isset($this->dataContext['Context']['Count']) ? $this->dataContext['Context']['Count'] : null;
$previousIndex = isset($this->dataContext['Context']['Index']) ? $this->dataContext['Context']['Index'] : null;
$previousCur = $this->dataContext['Cur'];
// For information on the loop context, see http://opensocial-resources.googlecode.com/svn/spec/0.9/OpenSocial-Templating.xml#rfc.section.10.1
$this->dataContext['Context']['Count'] = count($expressionResult);
foreach ($expressionResult as $index => $entry) {
if ($variableName) {
// this is cheating a little since we're not putting it on the top level scope, the variable resolver will check 'Cur' first though so myVar.Something will still resolve correctly
$this->dataContext['Cur'][$variableName] = $entry;
}
$this->dataContext['Cur'] = $entry;
$this->dataContext['Context']['Index'] = $index;
// Clone this node and it's children
$newNode = $node->cloneNode(true);
// Append the parsed & expanded node to the parent
$newNode = $node->parentNode->insertBefore($newNode, $node);
// And parse it (using the global + loop context)
$this->parseNode($newNode, true);
}
// Restore our previous data context state
$this->dataContext['Cur'] = $previousCur;
if ($previousCount) {
$this->dataContext['Context']['Count'] = $previousCount;
} else {
unset($this->dataContext['Context']['Count']);
}
if ($previousIndex) {
$this->dataContext['Context']['Index'] = $previousIndex;
} else {
unset($this->dataContext['Context']['Index']);
}
return $node;
break;
case 'if':
if (!$expressionResult) {
return $node;
} else {
$node->removeAttribute('if');
}
break;
// These special cases that only apply for certain tag types
// These special cases that only apply for certain tag types
case 'selected':
if ($node->tagName == 'option') {
if ($expressionResult) {
$node->setAttribute('selected', 'selected');
} else {
$node->removeAttribute('selected');
}
} else {
throw new ExpressionException("Can only use selected on an option tag");
}
break;
case 'checked':
if ($node->tagName == 'input') {
if ($expressionResult) {
$node->setAttribute('checked', 'checked');
} else {
$node->removeAttribute('checked');
}
} else {
throw new ExpressionException("Can only use checked on an input tag");
}
break;
case 'disabled':
$disabledTags = array('input', 'button', 'select', 'textarea');
if (in_array($node->tagName, $disabledTags)) {
if ($expressionResult) {
$node->setAttribute('disabled', 'disabled');
} else {
$node->removeAttribute('disabled');
}
} else {
throw new ExpressionException("Can only use disabled on input, button, select and textarea tags");
}
break;
default:
// On non os-template spec attributes, do a simple str_replace with the evaluated value
$stringVal = htmlentities(ExpressionParser::stringValue($expressionResult), ENT_QUOTES, 'UTF-8');
$newAttrVal = str_replace($toReplace, $stringVal, $attr->value);
$node->setAttribute($attr->name, $newAttrVal);
break;
}
}
}
}
}
// if a repeat attribute was found, don't recurse on it's child nodes, the repeat handling already did that
if (isset($node->childNodes) && $node->childNodes->length > 0) {
$removeNodes = array();
// recursive loop to all this node's children
foreach ($node->childNodes as $childNode) {
if (($removeNode = $this->parseNode($childNode)) !== false) {
$removeNodes[] = $removeNode;
}
}
if (count($removeNodes)) {
foreach ($removeNodes as $removeNode) {
$removeNode->parentNode->removeChild($removeNode);
}
}
}
return false;
}
