%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
/**
* FromProcessor.php
*
* This file implements the processor for the FROM statements.
*
* Copyright (c) 2010-2013, 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__) . '/AbstractProcessor.php');
require_once(dirname(__FILE__) . '/ExpressionListProcessor.php');
require_once(dirname(__FILE__) . '/DefaultProcessor.php');
require_once(dirname(__FILE__) . '/../utils/ExpressionType.php');
/**
*
* This class processes the FROM statements.
*
* @author arothe
*
*/
class FromProcessor extends AbstractProcessor {
protected function initParseInfo($parseInfo = false) {
// first init
if ($parseInfo === false) {
$parseInfo = array('join_type' => "", 'saved_join_type' => "JOIN");
}
// loop init
return array('expression' => "", 'token_count' => 0, 'table' => "", 'no_quotes' => "", 'alias' => false,
'join_type' => "", 'next_join_type' => "", 'saved_join_type' => $parseInfo['saved_join_type'],
'ref_type' => false, 'ref_expr' => false, 'base_expr' => false, 'sub_tree' => false,
'subquery' => "");
}
protected function processFromExpression(&$parseInfo) {
$res = array();
// exchange the join types (join_type is save now, saved_join_type holds the next one)
$parseInfo['join_type'] = $parseInfo['saved_join_type']; // initialized with JOIN
$parseInfo['saved_join_type'] = ($parseInfo['next_join_type'] ? $parseInfo['next_join_type'] : 'JOIN');
// we have a reg_expr, so we have to parse it
if ($parseInfo['ref_expr'] !== false) {
$unparsed = $this->splitSQLIntoTokens($this->removeParenthesisFromStart($parseInfo['ref_expr']));
// here we can get a comma separated list
foreach ($unparsed as $k => $v) {
if ($this->isCommaToken($v)) {
$unparsed[$k] = "";
}
}
$processor = new ExpressionListProcessor();
$parseInfo['ref_expr'] = $processor->process($unparsed);
}
// there is an expression, we have to parse it
if (substr(trim($parseInfo['table']), 0, 1) == '(') {
$parseInfo['expression'] = $this->removeParenthesisFromStart($parseInfo['table']);
if (preg_match("/^\\s*select/i", $parseInfo['expression'])) {
$processor = new DefaultProcessor();
$parseInfo['sub_tree'] = $processor->process($parseInfo['expression']);
$res['expr_type'] = ExpressionType::SUBQUERY;
} else {
$tmp = $this->splitSQLIntoTokens($parseInfo['expression']);
$parseInfo['sub_tree'] = $this->process($tmp);
$res['expr_type'] = ExpressionType::TABLE_EXPRESSION;
}
} else {
$res['expr_type'] = ExpressionType::TABLE;
$res['table'] = $parseInfo['table'];
$res['no_quotes'] = $this->revokeQuotation($parseInfo['table']);
}
$res['alias'] = $parseInfo['alias'];
$res['join_type'] = $parseInfo['join_type'];
$res['ref_type'] = $parseInfo['ref_type'];
$res['ref_clause'] = $parseInfo['ref_expr'];
$res['base_expr'] = trim($parseInfo['expression']);
$res['sub_tree'] = $parseInfo['sub_tree'];
return $res;
}
public function process($tokens) {
$parseInfo = $this->initParseInfo();
$expr = array();
$skip_next = false;
$i = 0;
foreach ($tokens as $token) {
$upper = strtoupper(trim($token));
if ($skip_next && $token !== "") {
$parseInfo['token_count']++;
$skip_next = false;
continue;
} else {
if ($skip_next) {
continue;
}
}
switch ($upper) {
case 'OUTER':
case 'LEFT':
case 'RIGHT':
case 'NATURAL':
case 'CROSS':
case ',':
case 'JOIN':
case 'INNER':
break;
default:
$parseInfo['expression'] .= $token;
if ($parseInfo['ref_type'] !== false) { // all after ON / USING
$parseInfo['ref_expr'] .= $token;
}
break;
}
switch ($upper) {
case 'AS':
$parseInfo['alias'] = array('as' => true, 'name' => "", 'base_expr' => $token);
$parseInfo['token_count']++;
$n = 1;
$str = "";
while ($str == "") {
$parseInfo['alias']['base_expr'] .= ($tokens[$i + $n] === "" ? " " : $tokens[$i + $n]);
$str = trim($tokens[$i + $n]);
++$n;
}
$parseInfo['alias']['name'] = $str;
$parseInfo['alias']['no_quotes'] = $this->revokeQuotation($str);
$parseInfo['alias']['base_expr'] = trim($parseInfo['alias']['base_expr']);
continue;
case 'INDEX':
if ($token_category == 'CREATE') {
$token_category = $upper;
continue 2;
}
break;
case 'USING':
case 'ON':
$parseInfo['ref_type'] = $upper;
$parseInfo['ref_expr'] = "";
case 'CROSS':
case 'USE':
case 'FORCE':
case 'IGNORE':
case 'INNER':
case 'OUTER':
$parseInfo['token_count']++;
continue;
break;
case 'FOR':
$parseInfo['token_count']++;
$skip_next = true;
continue;
break;
case 'LEFT':
case 'RIGHT':
case 'STRAIGHT_JOIN':
$parseInfo['next_join_type'] = $upper;
break;
case ',':
$parseInfo['next_join_type'] = 'CROSS';
case 'JOIN':
if ($parseInfo['subquery']) {
$parseInfo['sub_tree'] = $this->parse($this->removeParenthesisFromStart($parseInfo['subquery']));
$parseInfo['expression'] = $parseInfo['subquery'];
}
$expr[] = $this->processFromExpression($parseInfo);
$parseInfo = $this->initParseInfo($parseInfo);
break;
default:
if ($upper === "") {
continue; // ends the switch statement!
}
if ($parseInfo['token_count'] === 0) {
if ($parseInfo['table'] === "") {
$parseInfo['table'] = $token;
$parseInfo['no_quotes'] = $this->revokeQuotation($token);
}
} elseif ($parseInfo['token_count'] === 1) {
$parseInfo['alias'] = array('as' => false, 'name' => trim($token),
'no_quotes' => $this->revokeQuotation($token),
'base_expr' => trim($token));
}
$parseInfo['token_count']++;
break;
}
++$i;
}
$expr[] = $this->processFromExpression($parseInfo);
return $expr;
}
}
?>
Zerion Mini Shell 1.0