/**
* Checks if $token is a qname.
*
* @param String $token The token
* @return boolean TRUE if the token is a qname false if not
* @throws SparqlParserException
*/
protected function qnameCheck($token)
{
$pattern = "/^([^:^\\<]*):([^:]*)\$/";
if (preg_match($pattern, $token, $hits) > 0) {
$prefs = $this->query->getPrefixes();
if (isset($prefs[$hits[1]])) {
return true;
}
if ($hits[1] == "_") {
return true;
}
throw new SparqlParserException("Unbound Prefix: <i>" . $hits[1] . "</i>", null, key($this->tokens));
} else {
return false;
}
}
/**
* Builds an evaluation string to determine wether the result passes
* the filter or not. This string is evaluatet by the php buildin eval() function
*
* @param Array $vars a list which contains the used variables
* @param Array $res the result part which have to be evaluated
* @param Constraint $constraint the Constrain object
* @param Array $function an Array which contains the used functions
* @return String
*/
protected function fillConstraintString($vars, $res, $constraint, $function)
{
$boundExpr = false;
$evalString = $constraint->getExpression();
// extract Literals
$pattern1 = "/\".[^\"]*\"[^\\^\\@]/";
$pattern2 = "/\\'.[^\\']*\\'[^\\^\\@]/";
preg_match_all($pattern1, $evalString, $hits1);
preg_match_all($pattern2, $evalString, $hits2);
foreach ($hits1[0] as $k => $val) {
$evalString = preg_replace('/\\".[^\\"]*\\"[^\\^]/', '_REPLACED1_' . $k++, $evalString, 1);
}
foreach ($hits2[0] as $k => $val) {
$evalString = preg_replace('/\\".[^\\"]*\\"[^\\^]/', '_REPLACED2_' . $k++, $evalString, 1);
}
// replace namespaces
$prefs = $this->query->getPrefixes();
foreach ($prefs as $key => $val) {
if ($key == '') {
$key = ' ';
}
$evalString = preg_replace("/^(" . $key . "\\:)(.[^\\s]*)|([\\s\\(]?[^\\^])(" . $key . "\\:)(.[^\\s\\)]*)([\\s\\)]?)/", "\$3'<" . $val . "\$2\$5>'\$6", $evalString);
$evalString = preg_replace("/(\\^)(" . $key . "\\:)(.[^\\s]*)/", "\$1<" . $val . "\$3>", $evalString);
}
$xsd = "http\\:\\/\\/www.w3.org\\/2001\\/XMLSchema\\#";
// evaluate bound calls
if ($function['bound']) {
$boundExpr = true;
foreach ($function['bound'] as $var) {
if (isset($res[$var]) && $res[$var] !== "") {
$replacement = 'true';
} else {
$replacement = 'false';
}
$evalString = preg_replace("/bound\\(\\" . $var . "\\)/i", $replacement, $evalString);
}
}
// evaluate isBlank calls
if ($function['isBlank']) {
foreach ($function['isBlank'] as $var) {
if (isset($res[$var]) && $res[$var] !== "" && $res[$var] instanceof BlankNode) {
$replacement = 'true';
} else {
$replacement = 'false';
}
$evalString = preg_replace("/isBlank\\(\\" . $var . "\\)/i", $replacement, $evalString);
}
}
// evaluate isLiteral calls
if ($function['isLiteral']) {
foreach ($function['isLiteral'] as $var) {
if (isset($res[$var]) && $res[$var] !== "" && $res[$var] instanceof Literal) {
$replacement = 'true';
} else {
$replacement = 'false';
}
$evalString = preg_replace("/isLiteral\\(\\" . $var . "\\)/i", $replacement, $evalString);
}
}
// evaluate isUri calls
if ($function['isUri']) {
foreach ($function['isUri'] as $var) {
if (isset($res[$var]) && $res[$var] !== "" && $res[$var] instanceof Resource && $res[$var]->getUri() && !$res[$var] instanceof BlankNode) {
$replacement = 'true';
} else {
$replacement = 'false';
}
$evalString = preg_replace("/isUri\\(\\" . $var . "\\)/i", $replacement, $evalString);
}
}
// evaluate lang calls
if ($function['lang']) {
foreach ($function['lang'] as $var) {
if (isset($res[$var]) && $res[$var] !== "" && $res[$var] instanceof Literal && $res[$var]->getLanguage()) {
$replacement = '"' . $res[$var]->getLanguage() . '"';
} else {
$replacement = 'null';
}
$evalString = preg_replace("/lang\\(\\" . $var . "\\)/i", $replacement, $evalString);
}
}
// evaluate datatype calls
if ($function['datatype']) {
foreach ($function['datatype'] as $var) {
if (isset($res[$var]) && $res[$var] !== "" && $res[$var] instanceof Literal && $res[$var]->getDatatype()) {
$replacement = '\'<' . $res[$var]->getDatatype() . '>\'';
} else {
$replacement = 'false';
}
$evalString = preg_replace("/datatype\\(\\" . $var . "\\)/i", $replacement, $evalString);
}
}
// evaluate string calls
if ($function['string']) {
foreach ($function['string'] as $var) {
if ($var[0] == '?' || $var[0] == '$') {
if (isset($res[$var]) && $res[$var] !== "") {
$replacement = "'str_" . $res[$var]->getLabel() . "'";
if ($res[$var] instanceof BlankNode) {
$replacement = "''";
}
} else {
$replacement = 'false';
}
$evalString = preg_replace("/str\\(\\" . $var . "\\)/i", $replacement, $evalString);
} else {
if ($var[0] == '<') {
$evalString = preg_replace("/str\\(\\s*\\<(.[^\\>]*)\\>\\s*\\)/i", "'str_\$1'", $evalString);
}
if ($var[0] == '"') {
$evalString = preg_replace("/str\\(\\s*\"(.[^\\>]*)\"\\@[a-z]*\\s*\\)/i", "'str_\$1'", $evalString);
}
}
}
}
// evaluate VARS
foreach ($vars[0] as $var) {
if (isset($res[$var]) && $res[$var] !== "") {
//$replacement = "'".$res[$var]->getLabel()."'";
$replacement = '" "';
if ($res[$var] instanceof Literal) {
if ($res[$var]->getDatatype() != null) {
if ($res[$var]->getDatatype() == XML_SCHEMA . 'boolean') {
$replacement = $res[$var]->getLabel();
}
if ($res[$var]->getDatatype() == XML_SCHEMA . 'double') {
$replacement = $res[$var]->getLabel();
}
if ($res[$var]->getDatatype() == XML_SCHEMA . 'integer') {
$replacement = $res[$var]->getLabel();
}
if ($res[$var]->getDatatype() == XML_SCHEMA . 'dateTime') {
$replacement = strtotime($res[$var]->getLabel());
}
} else {
if ($res[$var]->getLabel() == "") {
$replacement = 'false';
} else {
$replacement = "'str_" . $res[$var]->getLabel() . "'";
}
}
} else {
if ($res[$var] instanceof Resource) {
$replacement = "'<" . $res[$var]->getLabel() . ">'";
}
}
$evalString = preg_replace("/\\" . $var . "/", $replacement, $evalString);
}
// problem with PHP: false < 13 is true
if (isset($res[$var])) {
if ($res[$var] === "") {
if ($boundExpr) {
$evalString = preg_replace("/\\" . $var . "/", "false", $evalString);
} else {
$evalString = 'false';
}
}
} else {
$evalString = preg_replace("/\\" . $var . "/", "false", $evalString);
}
}
// replace '=' with '=='
$evalString = preg_replace("/(.[^\\=])(\\=)(.[^\\=])/", "\$1==\$3", $evalString);
// rewrite Literals
foreach ($hits1[0] as $k => $val) {
$pattern = '/_REPLACED1_' . $k . '/';
$evalString = preg_replace($pattern, $hits1[0][$k], $evalString, 1);
}
foreach ($hits2[0] as $k => $val) {
$pattern = '/_REPLACED2_' . $k . '/';
$evalString = preg_replace($pattern, $hits2[0][$k], $evalString, 1);
}
// replace xsd:boolean expressions
$pattern = $pattern = '/\\"\\s?true\\s?\\"\\^\\^\\<' . $xsd . 'boolean\\>|\'\\s?true\\s?\'\\^\\^xsd:boolean/';
$evalString = preg_replace($pattern, "true", $evalString);
$pattern = $pattern = '/\\"\\s?false\\s?\\"\\^\\^\\<' . $xsd . 'boolean\\>|\'\\s?false\\s?\'\\^\\^xsd:boolean/';
$evalString = preg_replace($pattern, "false", $evalString);
// replace xsd:date expressions
$pattern = "/\"(.[^\"]*)\"\\^\\^" . $xsd . "dateTime/";
preg_match_all($pattern, $evalString, $hits);
foreach ($hits[1] as $dummy) {
$evalString = preg_replace("/\".[^\"]*\"\\^\\^" . $xsd . "dateTime/", strtotime($dummy), $evalString, 1);
}
$evalString = preg_replace("/(\\'\\<" . $xsd . "dateTime\\()(.[^\\)]*\\))\\>\\'/", "dateTime(\$2", $evalString);
$evalString = preg_replace("/(\\'\\<" . $xsd . "integer\\()(.[^\\)]*\\))\\>\\'/", "integer(\$2", $evalString);
// tag plain literals
$evalString = preg_replace("/\"(.[^\"]*)\"([^\\^])|\"(.[^\"]*)\"\$/", "'str_\$1\$3'\$2", $evalString);
return $evalString;
}
