134 lines
3.2 KiB
PHP
Executable File
134 lines
3.2 KiB
PHP
Executable File
<?php
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/**
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* `LIMIT` keyword parser.
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*/
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namespace PhpMyAdmin\SqlParser\Components;
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use PhpMyAdmin\SqlParser\Component;
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use PhpMyAdmin\SqlParser\Parser;
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use PhpMyAdmin\SqlParser\Token;
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use PhpMyAdmin\SqlParser\TokensList;
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/**
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* `LIMIT` keyword parser.
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*
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* @category Keywords
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*
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* @license https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
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*/
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class Limit extends Component
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{
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/**
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* The number of rows skipped.
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*
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* @var int
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*/
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public $offset;
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/**
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* The number of rows to be returned.
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*
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* @var int
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*/
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public $rowCount;
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/**
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* Constructor.
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*
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* @param int $rowCount the row count
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* @param int $offset the offset
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*/
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public function __construct($rowCount = 0, $offset = 0)
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{
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$this->rowCount = $rowCount;
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$this->offset = $offset;
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}
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/**
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* @param Parser $parser the parser that serves as context
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* @param TokensList $list the list of tokens that are being parsed
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* @param array $options parameters for parsing
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*
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* @return Limit
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*/
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public static function parse(Parser $parser, TokensList $list, array $options = array())
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{
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$ret = new self();
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$offset = false;
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for (; $list->idx < $list->count; ++$list->idx) {
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/**
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* Token parsed at this moment.
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*
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* @var Token
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*/
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$token = $list->tokens[$list->idx];
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// End of statement.
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if ($token->type === Token::TYPE_DELIMITER) {
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break;
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}
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// Skipping whitespaces and comments.
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if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
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continue;
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}
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if (($token->type === Token::TYPE_KEYWORD) && ($token->flags & Token::FLAG_KEYWORD_RESERVED)) {
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break;
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}
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if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'OFFSET') {
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if ($offset) {
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$parser->error('An offset was expected.', $token);
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}
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$offset = true;
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continue;
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}
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if (($token->type === Token::TYPE_OPERATOR) && ($token->value === ',')) {
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$ret->offset = $ret->rowCount;
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$ret->rowCount = 0;
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continue;
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}
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// Skip if not a number
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if (($token->type !== Token::TYPE_NUMBER)) {
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break;
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}
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if ($offset) {
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$ret->offset = $token->value;
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$offset = false;
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} else {
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$ret->rowCount = $token->value;
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}
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}
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if ($offset) {
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$parser->error(
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'An offset was expected.',
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$list->tokens[$list->idx - 1]
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);
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}
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--$list->idx;
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return $ret;
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}
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/**
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* @param Limit $component the component to be built
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* @param array $options parameters for building
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*
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* @return string
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*/
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public static function build($component, array $options = array())
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{
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return $component->offset . ', ' . $component->rowCount;
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}
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}
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