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<?php
/**
* Parses a list of options.
*
* @package SqlParser
* @subpackage Fragments
*/
namespace SqlParser\Fragments;
use SqlParser\Fragment;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* Parses a list of options.
*
* @category Fragments
* @package SqlParser
* @subpackage Fragments
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class OptionsFragment extends Fragment
{
/**
* Array of selected options.
*
* @var array
*/
public $options = array();
/**
* Constructor.
*
* @param array $options The array of options. Options that have a value
* must be an array with two keys 'name' and 'value'.
*/
public function __construct(array $options = array())
{
$this->options = $options;
}
/**
* @param Parser $parser The parser that serves as context.
* @param TokensList $list The list of tokens that are being parsed.
* @param array $options Parameters for parsing.
*
* @return OptionsFragment
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = new OptionsFragment();
/**
* The ID that will be assigned to duplicate options.
* @var int
*/
$lastAssignedId = count($options) + 1;
/**
* The option that was processed last time.
* @var array
*/
$lastOption = null;
$lastOptionId = 0;
$brackets = 0;
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) || ($token->type === Token::TYPE_COMMENT)) {
continue;
}
if ($lastOption === null) {
if (isset($options[strtoupper($token->value)])) {
$lastOption = $options[strtoupper($token->value)];
$lastOptionId = is_array($lastOption) ? $lastOption[0] : $lastOption;
// Checking for option conflicts.
// For example, in `SELECT` statements the keywords `ALL` and `DISTINCT`
// conflict and if used together, they produce an invalid query.
// Usually, tokens can be identified in the array by the option ID,
// but if conflicts occur, a psuedo option ID is used.
// The first pseudo duplicate ID is the maximum value of the real
// options (e.g. if there are 5 options, the first fake ID is 6).
if (isset($ret->options[$lastOptionId])) {
$parser->error('This option conflicts with \'' . $ret->options[$lastOptionId] . '\'.', $token);
$lastOptionId = $lastAssignedId++;
}
} else {
// There is no option to be processed.
break;
}
}
if (is_array($lastOption)) {
if (empty($ret->options[$lastOptionId])) {
$ret->options[$lastOptionId] = array('name' => $token->value, 'value' => '');
} else {
if ($token->value !== '=') {
if ($token->value === '(') {
++$brackets;
} elseif ($token->value === ')') {
--$brackets;
} else {
$ret->options[$lastOptionId]['value'] .= $token->value;
}
if ($brackets === 0) {
$lastOption = null;
}
}
}
} else {
$ret->options[$lastOptionId] = $token->value;
$lastOption = null;
}
}
ksort($ret->options);
--$list->idx;
return $ret;
}
/**
* @param OptionsFragment $fragment The fragment to be built.
*
* @return string
*/
public static function build($fragment)
{
$options = array();
foreach ($fragment->options as $option) {
if (is_array($option)) {
$options[] = $option['name'] . '=' . $option['value'];
} else {
$options[] = $option;
}
}
return implode(' ', $options);
}
/**
* Checks if it has the specified option and returns it value or true.
*
* @param string $key The key to be checked.
*
* @return mixed
*/
public function has($key)
{
foreach ($this->options as $option) {
if ((is_array($option)) && ($key === $option['name'])) {
return $option['value'];
} elseif ($key === $option) {
return true;
}
}
return false;
}
/**
* Merges the specified options with these ones. Values with same ID will be
* replaced.
*
* @param array|OptionsFragment $options The options to be merged.
*
* @return void
*/
public function merge($options)
{
if (is_array($options)) {
$this->options = array_merge_recursive($this->options, $options);
} elseif ($options instanceof OptionsFragment) {
$this->options = array_merge_recursive($this->options, $options->options);
}
}
}
|
