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<?php
/**
* Utilities that are used for formatting queries.
*
* @package SqlParser
* @subpackage Utils
*/
namespace SqlParser\Utils;
use SqlParser\Lexer;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* Utilities that are used for formatting queries.
*
* @category Misc
* @package SqlParser
* @subpackage Utils
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class Formatter
{
/**
* The formatting options.
*
* @var array
*/
public $options;
/**
* Clauses that must be inlined.
*
* These clauses usually are short and it's nicer to have them inline.
*
* @var array
*/
public static $INLINE_CLAUSES = array(
'CREATE' => true,
'LIMIT' => true,
'PARTITION BY' => true,
'PARTITION' => true,
'PROCEDURE' => true,
'SUBPARTITION BY' => true,
'VALUES' => true,
);
/**
* Constructor.
*
* @param array $options The formatting options.
*/
public function __construct(array $options = array())
{
// The specified formatting options are merged with the default values.
$this->options = array_merge(
array(
/**
* The format of the result.
*
* @var string The type ('text', 'cli' or 'html')
*/
'type' => php_sapi_name() == 'cli' ? 'cli' : 'text',
/**
* The line ending used.
* By default, for text this is "\n" and for HTML this is "<br/>".
*
* @var string
*/
'line_ending' => $this->options['type'] == 'html' ? '<br/>' : "\n",
/**
* The string used for indentation.
*
* @var string
*/
'indentation' => ' ',
/**
* Whether comments should be removed or not.
*
* @var bool
*/
'remove_comments' => false,
/**
* Whether each clause should be on a new line.
*
* @var bool
*/
'clause_newline' => true,
/**
* Whether each part should be on a new line.
* Parts are delimited by brackets and commas.
*
* @var bool
*/
'parts_newline' => true,
/**
* Whether each part of each clause should be indented.
*
* @var bool
*/
'indent_parts' => true,
/**
* The styles used for HTML formatting.
* array($type, $flags, $span, $callback)
*
* @var array[]
*/
'formats' => array(
array(
'type' => Token::TYPE_KEYWORD,
'flags' => Token::FLAG_KEYWORD_RESERVED,
'html' => 'class="sql-reserved"',
'cli' => "\e[35m",
'function' => 'strtoupper',
),
array(
'type' => Token::TYPE_KEYWORD,
'flags' => 0,
'html' => 'class="sql-keyword"',
'cli' => "\e[95m",
'function' => 'strtoupper',
),
array(
'type' => Token::TYPE_COMMENT,
'flags' => 0,
'html' => 'class="sql-comment"',
'cli' => "\e[37m",
'function' => '',
),
array(
'type' => Token::TYPE_BOOL,
'flags' => 0,
'html' => 'class="sql-atom"',
'cli' => "\e[36m",
'function' => 'strtoupper',
),
array(
'type' => Token::TYPE_NUMBER,
'flags' => 0,
'html' => 'class="sql-number"',
'cli' => "\e[92m",
'function' => 'strtolower',
),
array(
'type' => Token::TYPE_STRING,
'flags' => 0,
'html' => 'class="sql-string"',
'cli' => "\e[91m",
'function' => '',
),
array(
'type' => Token::TYPE_SYMBOL,
'flags' => 0,
'html' => 'class="sql-variable"',
'cli' => "\e[36m",
'function' => '',
),
)
),
$options
);
// `parts_newline` requires `clause_newline`
$this->options['parts_newline'] &= $this->options['clause_newline'];
}
/**
* Formats the given list of tokens.
*
* @param TokensList $list The list of tokens.
*
* @return string
*/
public function formatList($list)
{
/**
* The query to be returned.
*
* @var string $ret
*/
$ret = '';
/**
* The indentation level.
*
* @var int $indent
*/
$indent = 0;
/**
* Whether the line ended.
*
* @var bool $lineEnded
*/
$lineEnded = false;
/**
* Whether current group is short (no linebreaks)
*
* @var bool $shortGroup
*/
$shortGroup = false;
/**
* The name of the last clause.
*
* @var string $lastClause
*/
$lastClause = '';
/**
* A stack that keeps track of the indentation level every time a new
* block is found.
*
* @var array $blocksIndentation
*/
$blocksIndentation = array();
/**
* A stack that keeps track of the line endings every time a new block
* is found.
*
* @var array $blocksLineEndings
*/
$blocksLineEndings = array();
/**
* Whether clause's options were formatted.
*
* @var bool $formattedOptions
*/
$formattedOptions = false;
/**
* Previously parsed token.
*
* @var Token $prev
*/
$prev = null;
/**
* Comments are being formatted separately to maintain the whitespaces
* before and after them.
*
* @var string $comment
*/
$comment = '';
// In order to be able to format the queries correctly, the next token
// must be taken into consideration. The loop below uses two pointers,
// `$prev` and `$curr` which store two consecutive tokens.
// Actually, at every iteration the previous token is being used.
for ($list->idx = 0; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*
* @var Token $curr
*/
$curr = $list->tokens[$list->idx];
if ($curr->type === Token::TYPE_WHITESPACE) {
// Whitespaces are skipped because the formatter adds its own.
continue;
} elseif ($curr->type === Token::TYPE_COMMENT) {
// Whether the comments should be parsed.
if (!empty($this->options['remove_comments'])) {
continue;
}
if ($list->tokens[$list->idx - 1]->type === Token::TYPE_WHITESPACE) {
// The whitespaces before and after are preserved for
// formatting reasons.
$comment .= $list->tokens[$list->idx - 1]->token;
}
$comment .= $this->toString($curr);
if (($list->tokens[$list->idx + 1]->type === Token::TYPE_WHITESPACE)
&& ($list->tokens[$list->idx + 2]->type !== Token::TYPE_COMMENT)
) {
// Adding the next whitespace only there is no comment that
// follows it immediately which may cause adding a
// whitespace twice.
$comment .= $list->tokens[$list->idx + 1]->token;
}
// Everything was handled here, no need to continue.
continue;
}
// Checking if pointers were initialized.
if ($prev !== null) {
// Checking if a new clause started.
if (static::isClause($prev) !== false) {
$lastClause = $prev->value;
$formattedOptions = false;
}
// The options of a clause should stay on the same line and everything that follows.
if (($this->options['parts_newline'])
&& (!$formattedOptions)
&& (empty(self::$INLINE_CLAUSES[$lastClause]))
&& (($curr->type !== Token::TYPE_KEYWORD)
|| (($curr->type === Token::TYPE_KEYWORD)
&& ($curr->flags & Token::FLAG_KEYWORD_FUNCTION)))
) {
$formattedOptions = true;
$lineEnded = true;
++$indent;
}
// Checking if this clause ended.
if ($tmp = static::isClause($curr)) {
if (($tmp == 2) || ($this->options['clause_newline'])) {
$lineEnded = true;
if ($this->options['parts_newline']) {
--$indent;
}
}
}
// Indenting BEGIN ... END blocks.
if (($prev->type === Token::TYPE_KEYWORD) && ($prev->value === 'BEGIN')) {
$lineEnded = true;
array_push($blocksIndentation, $indent);
++$indent;
} elseif (($curr->type === Token::TYPE_KEYWORD) && ($curr->value === 'END')) {
$lineEnded = true;
$indent = array_pop($blocksIndentation);
}
// Formatting fragments delimited by comma.
if (($prev->type === Token::TYPE_OPERATOR) && ($prev->value === ',')) {
// Fragments delimited by a comma are broken into multiple
// pieces only if the clause is not inlined or this fragment
// is between brackets that are on new line.
if (((empty(self::$INLINE_CLAUSES[$lastClause]))
&& ! $shortGroup
&& ($this->options['parts_newline']))
|| (end($blocksLineEndings) === true)
) {
$lineEnded = true;
}
}
// Handling brackets.
// Brackets are indented only if the length of the fragment between
// them is longer than 30 characters.
if (($prev->type === Token::TYPE_OPERATOR) && ($prev->value === '(')) {
array_push($blocksIndentation, $indent);
$shortGroup = true;
if (static::getGroupLength($list) > 30) {
++$indent;
$lineEnded = true;
$shortGroup = false;
}
array_push($blocksLineEndings, $lineEnded);
} elseif (($curr->type === Token::TYPE_OPERATOR) && ($curr->value === ')')) {
$indent = array_pop($blocksIndentation);
$lineEnded |= array_pop($blocksLineEndings);
$shortGroup = false;
}
// Delimiter must be placed on the same line with the last
// clause.
if ($curr->type === Token::TYPE_DELIMITER) {
$lineEnded = false;
}
// Adding the token.
$ret .= $this->toString($prev);
// Finishing the line.
if ($lineEnded) {
if ($indent < 0) {
// TODO: Make sure this never occurs and delete it.
$indent = 0;
}
if ($curr->type !== Token::TYPE_COMMENT) {
$ret .= $this->options['line_ending']
. str_repeat($this->options['indentation'], $indent);
}
$lineEnded = false;
} else {
// If the line ended there is no point in adding whitespaces.
// Also, some tokens do not have spaces before or after them.
if (!((($prev->type === Token::TYPE_OPERATOR) && (($prev->value === '.') || ($prev->value === '(')))
// No space after . (
|| (($curr->type === Token::TYPE_OPERATOR) && (($curr->value === '.') || ($curr->value === ',')
|| ($curr->value === '(') || ($curr->value === ')')))
// No space before . , ( )
|| (($curr->type === Token::TYPE_DELIMITER)) && (mb_strlen($curr->value, 'UTF-8') < 2))
// A space after delimiters that are longer than 2 characters.
|| ($prev->value === 'DELIMITER')
) {
$ret .= ' ';
}
}
}
if (!empty($comment)) {
$ret .= $comment;
$comment = '';
}
// Iteration finished, consider current token as previous.
$prev = $curr;
}
if ($this->options['type'] === 'cli') {
return $ret . "\e[0m";
}
return $ret;
}
/**
* Tries to print the query and returns the result.
*
* @param Token $token The token to be printed.
*
* @return string
*/
public function toString($token)
{
$text = $token->token;
foreach ($this->options['formats'] as $format) {
if (($token->type === $format['type'])
&& (($token->flags & $format['flags']) === $format['flags'])
) {
// Running transformation function.
if (!empty($format['function'])) {
$func = $format['function'];
$text = $func($text);
}
// Formatting HTML.
if ($this->options['type'] === 'html') {
return '<span ' . $format['html'] . '>' . $text . '</span>';
} elseif ($this->options['type'] === 'cli') {
return $format['cli'] . $text;
}
break;
}
}
if ($this->options['type'] === 'cli') {
return "\e[39m" . $text;
}
return $text;
}
/**
* Formats a query.
*
* @param string $query The query to be formatted
* @param array $options The formatting options.
*
* @return string The formatted string.
*/
public static function format($query, array $options = array())
{
$lexer = new Lexer($query);
$formatter = new Formatter($options);
return $formatter->formatList($lexer->list);
}
/**
* Computes the length of a group.
*
* A group is delimited by a pair of brackets.
*
* @param TokensList $list The list of tokens.
*
* @return int
*/
public static function getGroupLength($list)
{
/**
* The number of opening brackets found.
* This counter starts at one because by the time this function called,
* the list already advanced one position and the opening bracket was
* already parsed.
*
* @var int $count
*/
$count = 1;
/**
* The length of this group.
*
* @var int $length
*/
$length = 0;
for ($idx = $list->idx; $idx < $list->count; ++$idx) {
// Counting the brackets.
if ($list->tokens[$idx]->type === Token::TYPE_OPERATOR) {
if ($list->tokens[$idx]->value === '(') {
++$count;
} elseif ($list->tokens[$idx]->value === ')') {
--$count;
if ($count == 0) {
break;
}
}
}
// Keeping track of this group's length.
$length += mb_strlen($list->tokens[$idx]->value, 'UTF-8');
}
return $length;
}
/**
* Checks if a token is a statement or a clause inside a statement.
*
* @param Token $token The token to be checked.
*
* @return int|bool
*/
public static function isClause($token)
{
if ((($token->type === Token::TYPE_NONE) && (strtoupper($token->token) === 'DELIMITER'))
|| (($token->type === Token::TYPE_KEYWORD) && (isset(Parser::$STATEMENT_PARSERS[$token->value])))
) {
return 2;
} elseif (($token->type === Token::TYPE_KEYWORD) && (isset(Parser::$KEYWORD_PARSERS[$token->value]))) {
return 1;
}
return false;
}
}