From 09faf92c59feed5c2db7490372ba3dd3947707e8 Mon Sep 17 00:00:00 2001 From: Deven Bansod Date: Sat, 22 Dec 2018 14:11:48 +0530 Subject: [PATCH] Add support for LOCK and UNLOCK Statements Signed-off-by: Deven Bansod --- src/Components/LockExpression.php | 203 ++++++++++++++++++++++++ src/Parser.php | 5 + src/Statements/LockStatement.php | 128 +++++++++++++++ tests/Builder/LockStatementTest.php | 68 ++++++++ tests/Components/LockExpressionTest.php | 71 +++++++++ tests/Parser/LockStatementTest.php | 41 +++++ tests/data/parser/parseLock1.in | 1 + tests/data/parser/parseLock1.out | 1 + tests/data/parser/parseLock2.in | 1 + tests/data/parser/parseLock2.out | 1 + tests/data/parser/parseLock3.in | 1 + tests/data/parser/parseLock3.out | 1 + tests/data/parser/parseLock4.in | 1 + tests/data/parser/parseLock4.out | 1 + tests/data/parser/parseLock5.in | 1 + tests/data/parser/parseLock5.out | 1 + tests/data/parser/parseLock6.in | 1 + tests/data/parser/parseLock6.out | 1 + tests/data/parser/parseLockErr1.in | 1 + tests/data/parser/parseLockErr1.out | 1 + tests/data/parser/parseLockErr10.in | 1 + tests/data/parser/parseLockErr10.out | 1 + tests/data/parser/parseLockErr2.in | 1 + tests/data/parser/parseLockErr2.out | 1 + tests/data/parser/parseLockErr3.in | 2 + tests/data/parser/parseLockErr3.out | 4 + tests/data/parser/parseLockErr4.in | 2 + tests/data/parser/parseLockErr4.out | 4 + tests/data/parser/parseLockErr5.in | 2 + tests/data/parser/parseLockErr5.out | 4 + tests/data/parser/parseLockErr6.in | 2 + tests/data/parser/parseLockErr6.out | 4 + tests/data/parser/parseLockErr7.in | 1 + tests/data/parser/parseLockErr7.out | 1 + tests/data/parser/parseLockErr8.in | 1 + tests/data/parser/parseLockErr8.out | 1 + tests/data/parser/parseLockErr9.in | 1 + tests/data/parser/parseLockErr9.out | 1 + tests/data/parser/parseUnlock1.in | 1 + tests/data/parser/parseUnlock1.out | 1 + tests/data/parser/parseUnlockErr1.in | 1 + tests/data/parser/parseUnlockErr1.out | 1 + 42 files changed, 568 insertions(+) create mode 100644 src/Components/LockExpression.php create mode 100644 src/Statements/LockStatement.php create mode 100644 tests/Builder/LockStatementTest.php create mode 100644 tests/Components/LockExpressionTest.php create mode 100644 tests/Parser/LockStatementTest.php create mode 100644 tests/data/parser/parseLock1.in create mode 100644 tests/data/parser/parseLock1.out create mode 100644 tests/data/parser/parseLock2.in create mode 100644 tests/data/parser/parseLock2.out create mode 100644 tests/data/parser/parseLock3.in create mode 100644 tests/data/parser/parseLock3.out create mode 100644 tests/data/parser/parseLock4.in create mode 100644 tests/data/parser/parseLock4.out create mode 100644 tests/data/parser/parseLock5.in create mode 100644 tests/data/parser/parseLock5.out create mode 100644 tests/data/parser/parseLock6.in create mode 100644 tests/data/parser/parseLock6.out create mode 100644 tests/data/parser/parseLockErr1.in create mode 100644 tests/data/parser/parseLockErr1.out create mode 100644 tests/data/parser/parseLockErr10.in create mode 100644 tests/data/parser/parseLockErr10.out create mode 100644 tests/data/parser/parseLockErr2.in create mode 100644 tests/data/parser/parseLockErr2.out create mode 100644 tests/data/parser/parseLockErr3.in create mode 100644 tests/data/parser/parseLockErr3.out create mode 100644 tests/data/parser/parseLockErr4.in create mode 100644 tests/data/parser/parseLockErr4.out create mode 100644 tests/data/parser/parseLockErr5.in create mode 100644 tests/data/parser/parseLockErr5.out create mode 100644 tests/data/parser/parseLockErr6.in create mode 100644 tests/data/parser/parseLockErr6.out create mode 100644 tests/data/parser/parseLockErr7.in create mode 100644 tests/data/parser/parseLockErr7.out create mode 100644 tests/data/parser/parseLockErr8.in create mode 100644 tests/data/parser/parseLockErr8.out create mode 100644 tests/data/parser/parseLockErr9.in create mode 100644 tests/data/parser/parseLockErr9.out create mode 100644 tests/data/parser/parseUnlock1.in create mode 100644 tests/data/parser/parseUnlock1.out create mode 100644 tests/data/parser/parseUnlockErr1.in create mode 100644 tests/data/parser/parseUnlockErr1.out diff --git a/src/Components/LockExpression.php b/src/Components/LockExpression.php new file mode 100644 index 000000000..644e3ca92 --- /dev/null +++ b/src/Components/LockExpression.php @@ -0,0 +1,203 @@ + 1 + * 1 ---------------- [ lock_type ] ----------------> 2 + * 2 -------------------- [ , ] --------------------> break + * + * @var int + */ + $state = 0; + + $prevToken = null; + + for (; $list->idx < $list->count; ++$list->idx) { + /** + * Token parsed at this moment. + * + * @var Token + */ + $token = $list->tokens[$list->idx]; + + // End of statement. + if ($token->type === Token::TYPE_DELIMITER + || ($token->type === Token::TYPE_OPERATOR + && $token->value === ',') + ) { + break; + } + + if ($state === 0) { + $ret->table = Expression::parse($parser, $list, array('parseField' => 'table')); + $state = 1; + } elseif ($state === 1) { + // parse lock type + $ret->type = self::parseLockType($parser, $list); + $state = 2; + } + $prevToken = $token; + } + + // 2 is the only valid end state + if ($state !== 2) { + $parser->error('Unexpected end of LOCK expression.', $prevToken); + } + + --$list->idx; + + return $ret; + } + + /** + * @param LockExpression|LockExpression[] $component the component to be built + * @param array $options parameters for building + * + * @return string + */ + public static function build($component, array $options = array()) + { + if (is_array($component)) { + return implode(', ', $component); + } + + return $component->table . ' ' . $component->type; + } + + private static function parseLockType(Parser $parser, TokensList $list) { + $lockType = ''; + + /** + * The state of the parser while parsing for lock type. + * + * Below are the states of the parser. + * + * 0 ---------------- [ READ ] -----------------> 1 + * 0 ------------- [ LOW_PRIORITY ] ------------> 2 + * 0 ---------------- [ WRITE ] ----------------> 3 + * 1 ---------------- [ LOCAL ] ----------------> 3 + * 2 ---------------- [ WRITE ] ----------------> 3 + * + * @var int + */ + $state = 0; + + $prevToken = null; + + for (; $list->idx < $list->count; ++$list->idx) { + /** + * Token parsed at this moment. + * + * @var Token + */ + $token = $list->tokens[$list->idx]; + + // End of statement. + if ($token->type === Token::TYPE_DELIMITER + || ($token->type === Token::TYPE_OPERATOR + && $token->value === ',') + ) { + --$list->idx; + break; + } + + // Skipping whitespaces and comments. + if ($token->type === Token::TYPE_WHITESPACE || $token->type === Token::TYPE_COMMENT) { + continue; + } + + // We only expect keywords + if ($token->type !== Token::TYPE_KEYWORD) { + $parser->error('Unexpected token.', $token); + break; + } + + if ($state === 0) { + if ($token->keyword === 'READ') { + $state = 1; + } elseif ($token->keyword === 'LOW_PRIORITY') { + $state = 2; + } elseif ($token->keyword === 'WRITE') { + $state = 3; + } else { + $parser->error('Unexpected keyword.', $token); + break; + } + $lockType .= $token->keyword; + } elseif ($state === 1) { + if ($token->keyword === 'LOCAL') { + $lockType .= ' ' . $token->keyword; + $state = 3; + } else { + $parser->error('Unexpected keyword.', $token); + break; + } + } elseif ($state === 2) { + if ($token->keyword === 'WRITE') { + $lockType .= ' ' . $token->keyword; + $state = 3; // parsing over + } else { + $parser->error('Unexpected keyword.', $token); + break; + } + } + + $prevToken = $token; + } + + // Only two possible end states + if ($state !== 1 && $state !== 3) { + $parser->error('Unexpected end of Lock expression.', $prevToken); + } + + return $lockType; + } +} diff --git a/src/Parser.php b/src/Parser.php index 738872ade..c4db416e3 100644 --- a/src/Parser.php +++ b/src/Parser.php @@ -88,6 +88,11 @@ class Parser extends Core 'START TRANSACTION' => 'PhpMyAdmin\\SqlParser\\Statements\\TransactionStatement', 'PURGE' => 'PhpMyAdmin\\SqlParser\\Statements\\PurgeStatement', + + // Lock statements + // https://dev.mysql.com/doc/refman/5.7/en/lock-tables.html + 'LOCK' => 'PhpMyAdmin\\SqlParser\\Statements\\LockStatement', + 'UNLOCK' => 'PhpMyAdmin\\SqlParser\\Statements\\LockStatement', ); /** diff --git a/src/Statements/LockStatement.php b/src/Statements/LockStatement.php new file mode 100644 index 000000000..2ba70c4ee --- /dev/null +++ b/src/Statements/LockStatement.php @@ -0,0 +1,128 @@ +tokens[$list->idx]->value === 'UNLOCK') { + // this is in fact an UNLOCK statement + $this->isLock = false; + } + ++$list->idx; // Skipping `LOCK`. + + /** + * The state of the parser. + * + * Below are the states of the parser. + * + * 0 ---------------- [ TABLES ] -----------------> 1 + * 1 -------------- [ lock_expr ] ----------------> 2 + * 2 ------------------ [ , ] --------------------> 1 + * + * @var int + */ + $state = 0; + + /** + * Previous parsed token + */ + $prevToken = null; + + for (; $list->idx < $list->count; ++$list->idx) { + /** + * Token parsed at this moment. + * + * @var Token + */ + $token = $list->tokens[$list->idx]; + + // End of statement. + if ($token->type === Token::TYPE_DELIMITER) { + break; + } + + // Skipping whitespaces and comments. + if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) { + continue; + } + + if ($state === 0) { + if ($token->type === Token::TYPE_KEYWORD) { + if ($token->keyword !== 'TABLES') { + $parser->error('Unexpected keyword.', $token); + break; + } + $state = 1; + continue; + } else { + $parser->error('Unexpected token.', $token); + break; + } + } elseif ($state === 1) { + if (!$this->isLock) { + // UNLOCK statement should not have any more tokens + $parser->error('Unexpected token.', $token); + break; + } + $this->locked[] = LockExpression::parse($parser, $list); + $state = 2; + } elseif ($state === 2) { + if ($token->value === ',') { + // move over to parsing next lock expression + $state = 1; + } + } + + $prevToken = $token; + } + + if ($state !== 2 && $prevToken != null) { + $parser->error('Unexpected end of LOCK statement.', $prevToken); + } + } + + /** + * @return string + */ + public function build() + { + return trim(($this->isLock ? 'LOCK' : 'UNLOCK') + . ' TABLES ' . LockExpression::build($this->locked)); + } +} diff --git a/tests/Builder/LockStatementTest.php b/tests/Builder/LockStatementTest.php new file mode 100644 index 000000000..b0b4d38e7 --- /dev/null +++ b/tests/Builder/LockStatementTest.php @@ -0,0 +1,68 @@ +statements[0]; + + $this->assertEquals($query, $stmt->build()); + + /* Assertion 2 */ + $query = 'LOCK TABLES table1 AS `t1` READ'; + + $parser = new Parser($query); + $stmt = $parser->statements[0]; + + $this->assertEquals($query, $stmt->build()); + + /* Assertion 3 */ + $query = 'LOCK TABLES table1 AS `t1` LOW_PRIORITY WRITE'; + + $parser = new Parser($query); + $stmt = $parser->statements[0]; + + $this->assertEquals($query, $stmt->build()); + + /* Assertion 4 */ + $query = 'LOCK TABLES table1 AS `t1` WRITE'; + + $parser = new Parser($query); + $stmt = $parser->statements[0]; + + $this->assertEquals($query, $stmt->build()); + + /* Assertion 5 */ + $query = 'LOCK TABLES table1 AS `t1` READ LOCAL, table2 AS `t2` WRITE'; + + $parser = new Parser($query); + $stmt = $parser->statements[0]; + + $this->assertEquals($query, $stmt->build()); + + /* Assertion 6 */ + $query = 'LOCK TABLES table1 READ LOCAL, table2 AS `t2` WRITE'; + + $parser = new Parser($query); + $stmt = $parser->statements[0]; + + $this->assertEquals($query, $stmt->build()); + + /* Assertion 7 */ + $query = 'UNLOCK TABLES'; + + $parser = new Parser($query); + $stmt = $parser->statements[0]; + + $this->assertEquals($query, $stmt->build()); + } +} diff --git a/tests/Components/LockExpressionTest.php b/tests/Components/LockExpressionTest.php new file mode 100644 index 000000000..56654a6de --- /dev/null +++ b/tests/Components/LockExpressionTest.php @@ -0,0 +1,71 @@ +getTokensList('table1 AS t1 READ LOCAL')); + $this->assertNotNull($component->table); + $this->assertEquals($component->table->table, 'table1'); + $this->assertEquals($component->table->alias, 't1'); + $this->assertEquals($component->type, 'READ LOCAL'); + } + + public function testParse2() + { + $component = LockExpression::parse(new Parser(), $this->getTokensList('table1 LOW_PRIORITY WRITE')); + $this->assertNotNull($component->table); + $this->assertEquals($component->table->table, 'table1'); + $this->assertEquals($component->type, 'LOW_PRIORITY WRITE'); + } + + /** + * @dataProvider testParseErrProvider + * + * @param mixed $expr + * @param mixed $error + */ + public function testParseErr($expr, $error) + { + $parser = new Parser(); + LockExpression::parse($parser, $this->getTokensList($expr)); + $errors = $this->getErrorsAsArray($parser); + $this->assertEquals($errors[0][0], $error); + } + + public function testParseErrProvider() + { + return array( + array( + 'table1 AS t1', + 'Unexpected end of LOCK expression.', + ), + array( + 'table1 AS t1 READ WRITE', + 'Unexpected keyword.', + ), + array( + 'table1 AS t1 READ 2', + 'Unexpected token.', + ), + ); + } + + public function testBuild() + { + $component = array( + LockExpression::parse(new Parser(), $this->getTokensList('table1 AS t1 READ LOCAL')), + LockExpression::parse(new Parser(), $this->getTokensList('table2 LOW_PRIORITY WRITE')), + ); + $this->assertEquals( + LockExpression::build($component), + 'table1 AS `t1` READ LOCAL, table2 LOW_PRIORITY WRITE' + ); + } +} diff --git a/tests/Parser/LockStatementTest.php b/tests/Parser/LockStatementTest.php new file mode 100644 index 000000000..3458e0a24 --- /dev/null +++ b/tests/Parser/LockStatementTest.php @@ -0,0 +1,41 @@ +runParserTest($test); + } + + public function testLockProvider() + { + return array( + array('parser/parseLock1'), + array('parser/parseLock2'), + array('parser/parseLock3'), + array('parser/parseLock4'), + array('parser/parseLock5'), + array('parser/parseLockErr1'), + array('parser/parseLockErr2'), + array('parser/parseLockErr3'), + array('parser/parseLockErr4'), + array('parser/parseLockErr5'), + array('parser/parseLockErr6'), + array('parser/parseLockErr7'), + array('parser/parseLockErr8'), + array('parser/parseLockErr9'), + array('parser/parseLockErr10'), + array('parser/parseUnlock1'), + array('parser/parseUnlockErr1'), + ); + } +} diff --git a/tests/data/parser/parseLock1.in b/tests/data/parser/parseLock1.in new file mode 100644 index 000000000..cfed7a3a6 --- /dev/null +++ b/tests/data/parser/parseLock1.in @@ -0,0 +1 @@ +LOCK TABLES table1 AS `t1` READ LOCAL; \ No newline at end of file diff --git a/tests/data/parser/parseLock1.out b/tests/data/parser/parseLock1.out new file mode 100644 index 000000000..678bd43bb --- /dev/null +++ b/tests/data/parser/parseLock1.out @@ -0,0 +1 @@ +a:4:{s:5:"query";s:43:"LOCK TABLES table1 AS `t1` READ LOCAL;";s:5:"lexer";O:26:"PhpMyAdmin\SqlParser\Lexer":8:{s:3:"str";s:43:"LOCK TABLES table1 AS `t1` READ 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