public function process($tokens)
{
$result = array();
$prevCategory = '';
$currCategory = '';
$parsed = array();
$expr = array();
$base_expr = '';
$skip = 0;
foreach ($tokens as $tokenKey => $token) {
$trim = trim($token);
$base_expr .= $token;
if ($skip > 0) {
$skip--;
continue;
}
if ($skip < 0) {
break;
}
if ($trim === '') {
continue;
}
$upper = strtoupper($trim);
switch ($upper) {
case 'PARTITION':
if ($currCategory === '') {
$expr[] = $this->getReservedType($trim);
$parsed = array('expr_type' => ExpressionType::PARTITION_DEF, 'base_expr' => trim($base_expr), 'sub_tree' => false);
$currCategory = $upper;
continue 2;
}
// else ?
break;
case 'VALUES':
if ($prevCategory === 'PARTITION') {
$expr[] = array('expr_type' => ExpressionType::PARTITION_VALUES, 'base_expr' => false, 'sub_tree' => false, 'storage' => substr($base_expr, 0, -strlen($token)));
$parsed['sub_tree'] = $expr;
$base_expr = $token;
$expr = array($this->getReservedType($trim));
$currCategory = $upper;
continue 2;
}
// else ?
break;
case 'LESS':
if ($currCategory === 'VALUES') {
$expr[] = $this->getReservedType($trim);
continue 2;
}
// else ?
break;
case 'THAN':
if ($currCategory === 'VALUES') {
// followed by parenthesis and (value-list or expr)
$expr[] = $this->getReservedType($trim);
continue 2;
}
// else ?
break;
case 'MAXVALUE':
if ($currCategory === 'VALUES') {
$expr[] = $this->getConstantType($trim);
$last = array_pop($parsed['sub_tree']);
$last['base_expr'] = $base_expr;
$last['sub_tree'] = $expr;
$base_expr = $last['storage'] . $base_expr;
unset($last['storage']);
$parsed['sub_tree'][] = $last;
$parsed['base_expr'] = trim($base_expr);
$expr = $parsed['sub_tree'];
unset($last);
$currCategory = $prevCategory;
}
// else ?
break;
case 'IN':
if ($currCategory === 'VALUES') {
// followed by parenthesis and value-list
$expr[] = $this->getReservedType($trim);
continue 2;
}
break;
case 'COMMENT':
if ($prevCategory === 'PARTITION') {
$expr[] = array('expr_type' => ExpressionType::PARTITION_COMMENT, 'base_expr' => false, 'sub_tree' => false, 'storage' => substr($base_expr, 0, -strlen($token)));
$parsed['sub_tree'] = $expr;
$base_expr = $token;
$expr = array($this->getReservedType($trim));
$currCategory = $upper;
continue 2;
}
// else ?
break;
case 'STORAGE':
if ($prevCategory === 'PARTITION') {
// followed by ENGINE
$expr[] = array('expr_type' => ExpressionType::ENGINE, 'base_expr' => false, 'sub_tree' => false, 'storage' => substr($base_expr, 0, -strlen($token)));
$parsed['sub_tree'] = $expr;
$base_expr = $token;
$expr = array($this->getReservedType($trim));
$currCategory = $upper;
continue 2;
}
// else ?
break;
case 'ENGINE':
if ($currCategory === 'STORAGE') {
$expr[] = $this->getReservedType($trim);
$currCategory = $upper;
continue 2;
}
if ($prevCategory === 'PARTITION') {
$expr[] = array('expr_type' => ExpressionType::ENGINE, 'base_expr' => false, 'sub_tree' => false, 'storage' => substr($base_expr, 0, -strlen($token)));
$parsed['sub_tree'] = $expr;
$base_expr = $token;
$expr = array($this->getReservedType($trim));
$currCategory = $upper;
continue 2;
}
// else ?
break;
case '=':
if (in_array($currCategory, array('ENGINE', 'COMMENT', 'DIRECTORY', 'MAX_ROWS', 'MIN_ROWS'))) {
$expr[] = $this->getOperatorType($trim);
continue 2;
}
// else ?
break;
case ',':
if ($prevCategory === 'PARTITION' && $currCategory === '') {
// it separates the partition-definitions
$result[] = $parsed;
$parsed = array();
$base_expr = '';
$expr = array();
}
break;
case 'DATA':
case 'INDEX':
if ($prevCategory === 'PARTITION') {
// followed by DIRECTORY
$expr[] = array('expr_type' => constant('PHPSQLParser\\utils\\ExpressionType::PARTITION_' . $upper . '_DIR'), 'base_expr' => false, 'sub_tree' => false, 'storage' => substr($base_expr, 0, -strlen($token)));
$parsed['sub_tree'] = $expr;
$base_expr = $token;
$expr = array($this->getReservedType($trim));
$currCategory = $upper;
continue 2;
}
// else ?
break;
case 'DIRECTORY':
if ($currCategory === 'DATA' || $currCategory === 'INDEX') {
$expr[] = $this->getReservedType($trim);
$currCategory = $upper;
continue 2;
}
// else ?
break;
case 'MAX_ROWS':
case 'MIN_ROWS':
if ($prevCategory === 'PARTITION') {
$expr[] = array('expr_type' => constant('PHPSQLParser\\utils\\ExpressionType::PARTITION_' . $upper), 'base_expr' => false, 'sub_tree' => false, 'storage' => substr($base_expr, 0, -strlen($token)));
$parsed['sub_tree'] = $expr;
$base_expr = $token;
$expr = array($this->getReservedType($trim));
$currCategory = $upper;
continue 2;
}
// else ?
break;
default:
switch ($currCategory) {
case 'MIN_ROWS':
case 'MAX_ROWS':
case 'ENGINE':
case 'DIRECTORY':
case 'COMMENT':
$expr[] = $this->getConstantType($trim);
$last = array_pop($parsed['sub_tree']);
$last['sub_tree'] = $expr;
$last['base_expr'] = trim($base_expr);
$base_expr = $last['storage'] . $base_expr;
unset($last['storage']);
$parsed['sub_tree'][] = $last;
$parsed['base_expr'] = trim($base_expr);
$expr = $parsed['sub_tree'];
unset($last);
$currCategory = $prevCategory;
break;
case 'PARTITION':
// that is the partition name
$last = array_pop($expr);
$last['name'] = $trim;
$expr[] = $last;
$expr[] = $this->getConstantType($trim);
$parsed['sub_tree'] = $expr;
$parsed['base_expr'] = trim($base_expr);
break;
case 'VALUES':
// we have parenthesis and have to process an expression/in-list
$last = $this->getBracketExpressionType($trim);
$res = $this->processExpressionList($trim);
$last['sub_tree'] = empty($res) ? false : $res;
$expr[] = $last;
$last = array_pop($parsed['sub_tree']);
$last['base_expr'] = $base_expr;
$last['sub_tree'] = $expr;
$base_expr = $last['storage'] . $base_expr;
unset($last['storage']);
$parsed['sub_tree'][] = $last;
$parsed['base_expr'] = trim($base_expr);
$expr = $parsed['sub_tree'];
unset($last);
$currCategory = $prevCategory;
break;
case '':
if ($prevCategory === 'PARTITION') {
// last part to process, it is only one token!
if ($upper[0] === '(' && substr($upper, -1) === ')') {
$last = $this->getBracketExpressionType($trim);
$last['sub_tree'] = $this->processSubpartitionDefinition($trim);
$expr[] = $last;
unset($last);
$parsed['base_expr'] = trim($base_expr);
$parsed['sub_tree'] = $expr;
$currCategory = $prevCategory;
break;
}
}
// else ?
break;
default:
break;
}
break;
}
$prevCategory = $currCategory;
$currCategory = '';
}
$result[] = $parsed;
return $result;
}
