/**
* ComparisonOperator ::= "=" | "<" | "<=" | "<>" | ">" | ">=" | "!="
*
* @return string
*/
public function ComparisonOperator()
{
switch ($this->_lexer->lookahead['value']) {
case '=':
$this->match(Lexer::T_EQUALS);
return '=';
case '<':
$this->match(Lexer::T_LOWER_THAN);
$operator = '<';
if ($this->_lexer->isNextToken(Lexer::T_EQUALS)) {
$this->match(Lexer::T_EQUALS);
$operator .= '=';
} else {
if ($this->_lexer->isNextToken(Lexer::T_GREATER_THAN)) {
$this->match(Lexer::T_GREATER_THAN);
$operator .= '>';
}
}
return $operator;
case '>':
$this->match(Lexer::T_GREATER_THAN);
$operator = '>';
if ($this->_lexer->isNextToken(Lexer::T_EQUALS)) {
$this->match(Lexer::T_EQUALS);
$operator .= '=';
}
return $operator;
case '!':
$this->match(Lexer::T_NEGATE);
$this->match(Lexer::T_EQUALS);
return '<>';
default:
$this->syntaxError('=, <, <=, <>, >, >=, !=');
}
}
/**
* LikeExpression ::= StringExpression ["NOT"] "LIKE" (string | input_parameter) ["ESCAPE" char]
*/
public function _LikeExpression()
{
$stringExpr = $this->_StringExpression();
$isNot = false;
if ($this->_lexer->lookahead['type'] === Lexer::T_NOT) {
$this->match(Lexer::T_NOT);
$isNot = true;
}
$this->match(Lexer::T_LIKE);
if ($this->_lexer->isNextToken(Lexer::T_INPUT_PARAMETER)) {
$this->match(Lexer::T_INPUT_PARAMETER);
$stringPattern = new AST\InputParameter($this->_lexer->token['value']);
} else {
$this->match(Lexer::T_STRING);
$stringPattern = $this->_lexer->token['value'];
}
$escapeChar = null;
if ($this->_lexer->lookahead['type'] === Lexer::T_ESCAPE) {
$this->match(Lexer::T_ESCAPE);
$this->match(Lexer::T_STRING);
$escapeChar = $this->_lexer->token['value'];
}
return new AST\LikeExpression($stringExpr, $stringPattern, $isNot, $escapeChar);
}
