/**
* Attempts to match the given token with the current lookahead token.
* If they match, updates the lookahead token; otherwise raises a syntax error.
*
* @param int|string token type or value
* @return bool True if tokens match; false otherwise.
*/
public function match($token)
{
if (!($this->_lexer->lookahead['type'] === $token)) {
$this->syntaxError($this->_lexer->getLiteral($token));
}
$this->_lexer->moveNext();
}
/**
* SelectField ::= DocumentFieldName
*/
public function SelectField(Query $query)
{
if ($this->lexer->isNextToken(Lexer::T_DISTINCT)) {
$this->match(Lexer::T_DISTINCT);
$fieldName = $this->DocumentFieldName();
$query->distinct($fieldName);
if (!$this->lexer->isNextToken(Lexer::T_IDENTIFIER) && !$this->lexer->isNextToken(Lexer::T_FROM)) {
$this->syntaxError($this->lexer->getLiteral(Lexer::T_IDENTIFIER));
}
return;
} else {
$fieldName = $this->DocumentFieldName();
}
$limit = null;
$skip = null;
while ($this->lexer->isNextToken($this->lexer->lookahead['type'])) {
switch ($this->lexer->lookahead['type']) {
case Lexer::T_SKIP:
$this->match(Lexer::T_SKIP);
$this->match(Lexer::T_INTEGER);
$skip = $this->lexer->token['value'];
break;
case Lexer::T_LIMIT:
$this->match(Lexer::T_LIMIT);
$this->match(Lexer::T_INTEGER);
$limit = $this->lexer->token['value'];
break;
default:
break 2;
}
}
if ($skip || $limit) {
$skip = $skip !== null ? $skip : 0;
$query->selectSlice($fieldName, $skip, $limit);
} else {
$query->select($fieldName);
}
}
