public function process($tokens)
{
$expr = array('expr_type' => ExpressionType::REFERENCE, 'base_expr' => false, 'sub_tree' => array());
$base_expr = '';
foreach ($tokens as $key => $token) {
$trim = trim($token);
$base_expr .= $token;
if ($trim === '') {
continue;
}
$upper = strtoupper($trim);
switch ($upper) {
case ',':
# we stop on a single comma
# or at the end of the array $tokens
$expr = $this->buildReferenceDef($expr, trim(substr($base_expr, 0, -strlen($token))), $key - 1);
break 2;
case 'REFERENCES':
$expr['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$currCategory = $upper;
break;
case 'MATCH':
if ($currCategory === 'REF_COL_LIST') {
$expr['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$currCategory = 'REF_MATCH';
continue 2;
}
# else?
break;
case 'FULL':
case 'PARTIAL':
case 'SIMPLE':
if ($currCategory === 'REF_MATCH') {
$expr['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr['match'] = $upper;
$currCategory = 'REF_COL_LIST';
continue 2;
}
# else?
break;
case 'ON':
if ($currCategory === 'REF_COL_LIST') {
$expr['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$currCategory = 'REF_ACTION';
continue 2;
}
# else ?
break;
case 'UPDATE':
case 'DELETE':
if ($currCategory === 'REF_ACTION') {
$expr['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$currCategory = 'REF_OPTION_' . $upper;
continue 2;
}
# else ?
break;
case 'RESTRICT':
case 'CASCADE':
if (strpos($currCategory, 'REF_OPTION_') === 0) {
$expr['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr['on_' . strtolower(substr($currCategory, -6))] = $upper;
continue 2;
}
# else ?
break;
case 'SET':
case 'NO':
if (strpos($currCategory, 'REF_OPTION_') === 0) {
$expr['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr['on_' . strtolower(substr($currCategory, -6))] = $upper;
$currCategory = 'SEC_' . $currCategory;
continue 2;
}
# else ?
break;
case 'NULL':
case 'ACTION':
if (strpos($currCategory, 'SEC_REF_OPTION_') === 0) {
$expr['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr['on_' . strtolower(substr($currCategory, -6))] .= ' ' . $upper;
$currCategory = 'REF_COL_LIST';
continue 2;
}
# else ?
break;
default:
switch ($currCategory) {
case 'REFERENCES':
if ($upper[0] === '(' && substr($upper, -1) === ')') {
# index_col_name list
$processor = new IndexColumnListProcessor();
$cols = $processor->process($this->removeParenthesisFromStart($trim));
$expr['sub_tree'][] = array('expr_type' => ExpressionType::COLUMN_LIST, 'base_expr' => $trim, 'sub_tree' => $cols);
$currCategory = 'REF_COL_LIST';
continue 3;
}
# foreign key reference table name
$expr['sub_tree'][] = array('expr_type' => ExpressionType::TABLE, 'table' => $trim, 'base_expr' => $trim, 'no_quotes' => $this->revokeQuotation($trim));
continue 3;
default:
# else ?
break;
}
break;
}
}
if (!isset($expr['till'])) {
$expr = $this->buildReferenceDef($expr, trim($base_expr), -1);
}
return $expr;
}
public function process($tokens)
{
$base_expr = "";
$prevCategory = "";
$currCategory = "";
$expr = array();
$result = array();
$skip = 0;
foreach ($tokens as $k => $token) {
$trim = trim($token);
$base_expr .= $token;
if ($skip !== 0) {
$skip--;
continue;
}
if ($trim === "") {
continue;
}
$upper = strtoupper($trim);
switch ($upper) {
case 'CONSTRAINT':
$expr[] = array('expr_type' => ExpressionType::CONSTRAINT, 'base_expr' => $trim, 'sub_tree' => false);
$currCategory = $prevCategory = $upper;
continue 2;
case 'LIKE':
$expr[] = array('expr_type' => ExpressionType::LIKE, 'base_expr' => $trim);
$currCategory = $prevCategory = $upper;
continue 2;
case 'FOREIGN':
if ($prevCategory === "" || $prevCategory === "CONSTRAINT") {
$expr[] = array('expr_type' => ExpressionType::FOREIGN_KEY, 'base_expr' => $trim);
$currCategory = $upper;
continue 2;
}
# else ?
break;
case 'PRIMARY':
if ($prevCategory === "" || $prevCategory === "CONSTRAINT") {
# next one is KEY
$expr[] = array('expr_type' => ExpressionType::PRIMARY_KEY, 'base_expr' => $trim);
$currCategory = $upper;
continue 2;
}
# else ?
break;
case 'UNIQUE':
if ($prevCategory === "" || $prevCategory === "CONSTRAINT") {
# next one is KEY
$expr[] = array('expr_type' => ExpressionType::UNIQUE_IDX, 'base_expr' => $trim);
$currCategory = $upper;
continue 2;
}
# else ?
break;
case 'KEY':
# the next one is an index name
if ($currCategory === 'PRIMARY' || $currCategory === 'FOREIGN' || $currCategory === 'UNIQUE') {
$expr[] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
continue 2;
}
$expr[] = array('expr_type' => ExpressionType::INDEX, 'base_expr' => $trim);
$currCategory = $upper;
continue 2;
case 'CHECK':
$expr[] = array('expr_type' => ExpressionType::CHECK, 'base_expr' => $trim);
$currCategory = $upper;
continue 2;
case 'INDEX':
if ($currCategory === 'UNIQUE' || $currCategory === 'FULLTEXT' || $currCategory === 'SPATIAL') {
$expr[] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
continue 2;
}
$expr[] = array('expr_type' => ExpressionType::INDEX, 'base_expr' => $trim);
$currCategory = $upper;
continue 2;
case 'FULLTEXT':
$expr[] = array('expr_type' => ExpressionType::FULLTEXT_IDX, 'base_expr' => $trim);
$currCategory = $prevCategory = $upper;
continue 2;
case 'SPATIAL':
$expr[] = array('expr_type' => ExpressionType::SPATIAL_IDX, 'base_expr' => $trim);
$currCategory = $prevCategory = $upper;
continue 2;
case 'WITH':
# starts an index option
if ($currCategory === 'INDEX_COL_LIST') {
$option = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr[] = array('expr_type' => ExpressionType::INDEX_PARSER, 'base_expr' => substr($base_expr, 0, -strlen($token)), 'sub_tree' => array($option));
$base_expr = $token;
$currCategory = 'INDEX_PARSER';
continue 2;
}
break;
case 'KEY_BLOCK_SIZE':
# starts an index option
if ($currCategory === 'INDEX_COL_LIST') {
$option = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr[] = array('expr_type' => ExpressionType::INDEX_SIZE, 'base_expr' => substr($base_expr, 0, -strlen($token)), 'sub_tree' => array($option));
$base_expr = $token;
$currCategory = 'INDEX_SIZE';
continue 2;
}
break;
case 'USING':
# starts an index option
if ($currCategory === 'INDEX_COL_LIST' || $currCategory === 'PRIMARY') {
$option = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr[] = array('base_expr' => substr($base_expr, 0, -strlen($token)), 'trim' => $trim, 'category' => $currCategory, 'sub_tree' => array($option));
$base_expr = $token;
$currCategory = 'INDEX_TYPE';
continue 2;
}
# else ?
break;
case 'REFERENCES':
if ($currCategory === 'INDEX_COL_LIST' && $prevCategory === 'FOREIGN') {
$processor = new ReferenceDefinitionProcessor();
$refs = $processor->process(array_slice($tokens, $k - 1, null, true));
$skip = $refs['till'] - $k;
unset($refs['till']);
$expr[] = $refs;
$currCategory = $upper;
}
break;
case 'BTREE':
case 'HASH':
if ($currCategory === 'INDEX_TYPE') {
$last = array_pop($expr);
$last['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr[] = array('expr_type' => ExpressionType::INDEX_TYPE, 'base_expr' => $base_expr, 'sub_tree' => $last['sub_tree']);
$base_expr = $last['base_expr'] . $base_expr;
# FIXME: it could be wrong for index_type within index_option
$currCategory = $last['category'];
continue 2;
}
#else
break;
case '=':
if ($currCategory === 'INDEX_SIZE') {
# the optional character between KEY_BLOCK_SIZE and the numeric constant
$last = array_pop($expr);
$last['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr[] = $last;
continue 2;
}
break;
case 'PARSER':
if ($currCategory === 'INDEX_PARSER') {
$last = array_pop($expr);
$last['sub_tree'][] = array('expr_type' => ExpressionType::RESERVED, 'base_expr' => $trim);
$expr[] = $last;
continue 2;
}
# else?
break;
case ',':
# this starts the next definition
$type = $this->correctExpressionType($expr);
$result['create-def'][] = array('expr_type' => $type, 'base_expr' => trim(substr($base_expr, 0, -strlen($token))), 'sub_tree' => $expr);
$base_expr = "";
$expr = array();
break;
default:
switch ($currCategory) {
case 'LIKE':
# this is the tablename after LIKE
$expr[] = array('expr_type' => ExpressionType::TABLE, 'table' => $trim, 'base_expr' => $trim, 'no_quotes' => $this->revokeQuotation($trim));
break;
case 'PRIMARY':
if ($upper[0] === '(' && substr($upper, -1) === ')') {
# the column list
$processor = new IndexColumnListProcessor();
$cols = $processor->process($this->removeParenthesisFromStart($trim));
$expr[] = array('expr_type' => ExpressionType::COLUMN_LIST, 'base_expr' => $trim, 'sub_tree' => $cols);
$prevCategory = $currCategory;
$currCategory = "INDEX_COL_LIST";
continue 3;
}
# else?
break;
case 'FOREIGN':
if ($upper[0] === '(' && substr($upper, -1) === ')') {
$processor = new IndexColumnListProcessor();
$cols = $processor->process($this->removeParenthesisFromStart($trim));
$expr[] = array('expr_type' => ExpressionType::COLUMN_LIST, 'base_expr' => $trim, 'sub_tree' => $cols);
$prevCategory = $currCategory;
$currCategory = "INDEX_COL_LIST";
continue 3;
}
# index name
$expr[] = array('expr_type' => ExpressionType::CONSTANT, 'base_expr' => $trim);
continue 3;
case 'KEY':
case 'UNIQUE':
case 'INDEX':
if ($upper[0] === '(' && substr($upper, -1) === ')') {
$processor = new IndexColumnListProcessor();
$cols = $processor->process($this->removeParenthesisFromStart($trim));
$expr[] = array('expr_type' => ExpressionType::COLUMN_LIST, 'base_expr' => $trim, 'sub_tree' => $cols);
$prevCategory = $currCategory;
$currCategory = "INDEX_COL_LIST";
continue 3;
}
# index name
$expr[] = array('expr_type' => ExpressionType::CONSTANT, 'base_expr' => $trim);
continue 3;
case 'CONSTRAINT':
# constraint name
$last = array_pop($expr);
$last['base_expr'] = $base_expr;
$last['sub_tree'] = array('expr_type' => ExpressionType::CONSTANT, 'base_expr' => $trim);
$expr[] = $last;
continue 3;
case 'INDEX_PARSER':
# index parser name
$last = array_pop($expr);
$last['sub_tree'][] = array('expr_type' => ExpressionType::CONSTANT, 'base_expr' => $trim);
$expr[] = array('expr_type' => ExpressionType::INDEX_PARSER, 'base_expr' => $base_expr, 'sub_tree' => $last['sub_tree']);
$base_expr = $last['base_expr'] . $base_expr;
$currCategory = 'INDEX_COL_LIST';
continue 3;
case 'INDEX_SIZE':
# index key block size numeric constant
$last = array_pop($expr);
$last['sub_tree'][] = array('expr_type' => ExpressionType::CONSTANT, 'base_expr' => $trim);
$expr[] = array('expr_type' => ExpressionType::INDEX_SIZE, 'base_expr' => $base_expr, 'sub_tree' => $last['sub_tree']);
$base_expr = $last['base_expr'] . $base_expr;
$currCategory = 'INDEX_COL_LIST';
continue 3;
case 'CHECK':
if ($upper[0] === '(' && substr($upper, -1) === ')') {
$processor = new ExpressionListProcessor();
$unparsed = $this->splitSQLIntoTokens($this->removeParenthesisFromStart($trim));
$parsed = $processor->process($unparsed);
$expr[] = array('expr_type' => ExpressionType::BRACKET_EXPRESSION, 'base_expr' => $trim, 'sub_tree' => $parsed);
}
# else?
break;
case '':
# if the currCategory is empty, we have an unknown token,
# which is a column reference
$expr[] = array('expr_type' => ExpressionType::COLREF, 'base_expr' => $trim, 'no_quotes' => $this->revokeQuotation($trim));
$currCategory = 'COLUMN_NAME';
continue 3;
case 'COLUMN_NAME':
# the column-definition
# it stops on a comma or on a parenthesis
$processor = new ColumnDefinitionProcessor();
$parsed = $processor->process(array_slice($tokens, $k, null, true), $expr);
$skip = $parsed['till'] - $k;
unset($parsed['till']);
$expr[] = $parsed;
$currCategory = '';
break;
default:
# ?
break;
}
break;
}
$prevCategory = $currCategory;
$currCategory = '';
}
$type = $this->correctExpressionType($expr);
$result['create-def'][] = array('expr_type' => $type, 'base_expr' => trim($base_expr), 'sub_tree' => $expr);
return $result;
}
protected function processIndexColumnList($parsed)
{
$processor = new IndexColumnListProcessor();
return $processor->process($parsed);
}
