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JoinKeywords.php
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JoinKeywords.php
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<?php
declare(strict_types=1);
namespace PhpMyAdmin\SqlParser\Parsers;
use PhpMyAdmin\SqlParser\Components\JoinKeyword;
use PhpMyAdmin\SqlParser\Parseable;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\TokensList;
use PhpMyAdmin\SqlParser\TokenType;
use function implode;
/**
* `JOIN` keyword parser.
*/
final class JoinKeywords implements Parseable
{
/**
* @param Parser $parser the parser that serves as context
* @param TokensList $list the list of tokens that are being parsed
* @param array<string, mixed> $options parameters for parsing
*
* @return JoinKeyword[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = []): array
{
$ret = [];
$expr = new JoinKeyword();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -----------------------[ JOIN ]----------------------> 1
*
* 1 -----------------------[ expr ]----------------------> 2
*
* 2 ------------------------[ ON ]-----------------------> 3
* 2 -----------------------[ USING ]---------------------> 4
*
* 3 --------------------[ conditions ]-------------------> 0
*
* 4 ----------------------[ columns ]--------------------> 0
*/
$state = 0;
// By design, the parser will parse first token after the keyword.
// In this case, the keyword must be analyzed too, in order to determine
// the type of this join.
if ($list->idx > 0) {
--$list->idx;
}
for (; $list->idx < $list->count; ++$list->idx) {
/**
* Token parsed at this moment.
*/
$token = $list->tokens[$list->idx];
// End of statement.
if ($token->type === TokenType::Delimiter) {
break;
}
// Skipping whitespaces and comments.
if (($token->type === TokenType::Whitespace) || ($token->type === TokenType::Comment)) {
continue;
}
if ($state === 0) {
if (($token->type !== TokenType::Keyword) || empty(JoinKeyword::JOINS[$token->keyword])) {
break;
}
$expr->type = JoinKeyword::JOINS[$token->keyword];
$state = 1;
} elseif ($state === 1) {
$expr->expr = Expressions::parse($parser, $list, ['field' => 'table']);
$state = 2;
} elseif ($state === 2) {
if ($token->type === TokenType::Keyword) {
switch ($token->keyword) {
case 'ON':
$state = 3;
break;
case 'USING':
$state = 4;
break;
default:
if (empty(JoinKeyword::JOINS[$token->keyword])) {
/* Next clause is starting */
break 2;
}
$ret[] = $expr;
$expr = new JoinKeyword();
$expr->type = JoinKeyword::JOINS[$token->keyword];
$state = 1;
break;
}
}
} elseif ($state === 3) {
$expr->on = Conditions::parse($parser, $list);
$ret[] = $expr;
$expr = new JoinKeyword();
$state = 0;
} else {
$expr->using = ArrayObjs::parse($parser, $list);
$ret[] = $expr;
$expr = new JoinKeyword();
$state = 0;
}
}
if (! empty($expr->type)) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
/** @param JoinKeyword[] $component the component to be built */
public static function buildAll(array $component): string
{
return implode(' ', $component);
}
}