$subTree :
$expression :
$key :
$token :
$tokenType :
$trim :
$upper :
$noQuotes :
__construct( $key = "", $token = "")
addToken( $string)
isEnclosedWithinParenthesis()
setSubTree( $tree)
getSubTree()
getUpper( $idx = false)
getTrim( $idx = false)
getToken( $idx = false)
setNoQuotes( $token, $qchars = '`')
setTokenType( $type)
endsWith( $needle)
isWhitespaceToken()
isCommaToken()
isVariableToken()
isSubQueryToken()
isExpression()
isBracketExpression()
isOperator()
isInList()
isFunction()
isUnspecified()
isVariable()
isAggregateFunction()
isColumnReference()
isConstant()
isSign()
isSubQuery()
toArray()
revokeQuotation( $token, $qchars = '`')