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<?php
/**
* AbstractProcessor.php
*
* This file implements an abstract processor, which implements some helper functions.
*
* Copyright (c) 2010-2012, Justin Swanhart
* with contributions by André Rothe <arothe@phosco.info, phosco@gmx.de>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
require_once dirname(__FILE__) . '/../utils/ExpressionType.php';
require_once dirname(__FILE__) . '/../lexer/PHPSQLLexer.php';
/**
*
* This class processes contains some general functions for a processor.
*
* @author arothe
*
*/
abstract class AbstractProcessor {
/**
* This function implements the main functionality of a processor class.
* Always use default valuses for additional parameters within overridden functions.
*/
abstract public function process($tokens);
/**
* this function splits up a SQL statement into easy to "parse"
* tokens for the SQL processor
*/
public function splitSQLIntoTokens($sql) {
$lexer = new PHPSQLLexer();
return $lexer->split($sql);
}
/**
* Revokes the quoting characters from an expression
*/
protected function revokeQuotation($sql) {
$result = trim($sql);
if (($result[0] === '`') && ($result[strlen($result) - 1] === '`')) {
$result = substr($result, 1, -1);
return trim(str_replace('``', '`', $result));
}
if (($result[0] === "'") && ($result[strlen($result) - 1] === "'")) {
$result = substr($result, 1, -1);
return trim(str_replace("''", "'", $result));
}
if (($result[0] === "\"") && ($result[strlen($result) - 1] === "\"")) {
$result = substr($result, 1, -1);
return trim(str_replace("\"\"", "\"", $result));
}
return $sql;
}
/**
* This method removes parenthesis from start of the given string.
* It removes also the associated closing parenthesis.
*/
protected function removeParenthesisFromStart($token) {
$parenthesisRemoved = 0;
$trim = trim($token);
if ($trim !== "" && $trim[0] === "(") { // remove only one parenthesis pair now!
$parenthesisRemoved++;
$trim[0] = " ";
$trim = trim($trim);
}
$parenthesis = $parenthesisRemoved;
$i = 0;
$string = 0;
while ($i < strlen($trim)) {
if ($trim[$i] === "\\") {
$i += 2; # an escape character, the next character is irrelevant
continue;
}
if ($trim[$i] === "'" || $trim[$i] === '"') {
$string++;
}
if (($string % 2 === 0) && ($trim[$i] === "(")) {
$parenthesis++;
}
if (($string % 2 === 0) && ($trim[$i] === ")")) {
if ($parenthesis == $parenthesisRemoved) {
$trim[$i] = " ";
$parenthesisRemoved--;
}
$parenthesis--;
}
$i++;
}
return trim($trim);
}
protected function getVariableType($expression) {
// $expression must contain only upper-case characters
if ($expression[1] !== "@") {
return ExpressionType::USER_VARIABLE;
}
$type = substr($expression, 2, strpos($expression, ".", 2));
switch ($type) {
case 'GLOBAL':
$type = ExpressionType::GLOBAL_VARIABLE;
break;
case 'LOCAL':
$type = ExpressionType::LOCAL_VARIABLE;
break;
case 'SESSION':
default:
$type = ExpressionType::SESSION_VARIABLE;
break;
}
return $type;
}
protected function isCommaToken($token) {
return (trim($token) === ",");
}
protected function isWhitespaceToken($token) {
return (trim($token) === "");
}
protected function isCommentToken($token) {
return isset($token[0]) && isset($token[1])
&& (($token[0] === '-' && $token[1] === '-') || ($token[0] === '/' && $token[1] === '*'));
}
protected function isColumnReference($out) {
return (isset($out['expr_type']) && $out['expr_type'] === ExpressionType::COLREF);
}
protected function isReserved($out) {
return (isset($out['expr_type']) && $out['expr_type'] === ExpressionType::RESERVED);
}
protected function isConstant($out) {
return (isset($out['expr_type']) && $out['expr_type'] === ExpressionType::CONSTANT);
}
protected function isAggregateFunction($out) {
return (isset($out['expr_type']) && $out['expr_type'] === ExpressionType::AGGREGATE_FUNCTION);
}
protected function isFunction($out) {
return (isset($out['expr_type']) && $out['expr_type'] === ExpressionType::SIMPLE_FUNCTION);
}
protected function isExpression($out) {
return (isset($out['expr_type']) && $out['expr_type'] === ExpressionType::EXPRESSION);
}
protected function isBracketExpression($out) {
return (isset($out['expr_type']) && $out['expr_type'] === ExpressionType::BRACKET_EXPRESSION);
}
protected function isSubQuery($out) {
return (isset($out['expr_type']) && $out['expr_type'] === ExpressionType::SUBQUERY);
}
/**
* translates an array of objects into an associative array
*/
public function toArray($tokenList) {
$expr = array();
foreach ($tokenList as $token) {
$expr[] = $token->toArray();
}
return (empty($expr) ? false : $expr);
}
protected function array_insert_after($array, $key, $entry) {
$idx = array_search($key, array_keys($array));
$array = array_slice($array, 0, $idx + 1, true) + $entry
+ array_slice($array, $idx + 1, count($array) - 1, true);
return $array;
}
}
?>
Zerion Mini Shell 1.0