/**
* 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:
$this->syntaxError('=, <, <=, <>, >, >=, !=');
}
}
/**
* StringPrimary ::= StateFieldPathExpression | string | InputParameter | FunctionsReturningStrings | AggregateExpression
*/
public function _StringPrimary()
{
if ($this->_lexer->lookahead['type'] === Lexer::T_IDENTIFIER) {
$peek = $this->_lexer->glimpse();
if ($peek['value'] == '.') {
return $this->_StateFieldPathExpression();
} else {
if ($peek['value'] == '(') {
return $this->_FunctionsReturningStrings();
} else {
$this->syntaxError("'.' or '('");
}
}
} else {
if ($this->_lexer->lookahead['type'] === Lexer::T_STRING) {
$this->match(Lexer::T_STRING);
return $this->_lexer->token['value'];
} else {
if ($this->_lexer->lookahead['type'] === Lexer::T_INPUT_PARAMETER) {
$this->match(Lexer::T_INPUT_PARAMETER);
return new AST\InputParameter($this->_lexer->token['value']);
} else {
if ($this->_isAggregateFunction($this->_lexer->lookahead['type'])) {
return $this->_AggregateExpression();
} else {
$this->syntaxError('StateFieldPathExpression | string | InputParameter | FunctionsReturningStrings | AggregateExpression');
}
}
}
}
}
