fc6212b922
Updated sql-parser library to udan11/sql-parser@0bff48a. Signed-off-by: Dan Ungureanu <udan1107@gmail.com>
104 lines
2.5 KiB
PHP
104 lines
2.5 KiB
PHP
<?php
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/**
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* `JOIN` keyword parser.
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*
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* @package SqlParser
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* @subpackage Fragments
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*/
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namespace SqlParser\Fragments;
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use SqlParser\Fragment;
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use SqlParser\Parser;
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use SqlParser\Token;
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use SqlParser\TokensList;
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/**
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* `JOIN` keyword parser.
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*
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* @category Keywords
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* @package SqlParser
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* @subpackage Fragments
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* @author Dan Ungureanu <udan1107@gmail.com>
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* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
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*/
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class JoinKeyword extends Fragment
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{
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/**
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* Join expression.
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*
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* @var FieldFragment
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*/
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public $expr;
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/**
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* Join conditions.
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*
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* @var WhereKeyword[]
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*/
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public $on;
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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 JoinKeyword
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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 JoinKeyword();
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/**
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* The state of the parser.
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*
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* Below are the states of the parser.
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*
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* 0 -----------------------[ expr ]----------------------> 1
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*
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* 1 ------------------------[ ON ]-----------------------> 2
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*
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* 2 --------------------[ conditions ]-------------------> -1
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*
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* @var int
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*/
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$state = 0;
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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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* @var Token $token
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*/
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$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) || ($token->type === Token::TYPE_COMMENT)) {
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continue;
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}
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if ($state === 0) {
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$ret->expr = FieldFragment::parse($parser, $list, array('skipColumn' => true));
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$state = 1;
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} elseif ($state === 1) {
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if (($token->type === Token::TYPE_KEYWORD) && ($token->value === 'ON')) {
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$state = 2;
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}
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} elseif ($state === 2) {
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$ret->on = WhereKeyword::parse($parser, $list);
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++$list->idx;
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break;
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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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