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<?php
namespace SqlParser\Fragments;
use SqlParser\Fragment;
use SqlParser\Lexer;
use SqlParser\Parser;
use SqlParser\Token;
use SqlParser\TokensList;
/**
* `SET` keyword parser.
*/
class SetKeyword extends Fragment
{
/**
* The name of the column that is being updated.
*
* @var string
*/
public $column;
/**
* The new value.
*
* @var string
*/
public $value;
/**
* @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 SetKeyword[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
$expr = new SetKeyword();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -------------------[ field name ]--------------------> 1
*
* 1 ------------------------[ , ]------------------------> 0
* 1 ----------------------[ value ]----------------------> 1
*
* @var int
*/
$state = 0;
for (; $list->idx < $list->count; ++$list->idx) {
/** @var Token Token parsed at this moment. */
$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) || ($token->type === Token::TYPE_COMMENT)) {
continue;
}
// No keyword is expected.
if (($token->type === Token::TYPE_KEYWORD) && ($token->flags & Token::FLAG_KEYWORD_RESERVED)) {
break;
}
if ($token->type === Token::TYPE_OPERATOR) {
if ($token->value === ',') {
$ret[] = $expr;
$expr = new SetKeyword();
$state = 0;
continue;
} elseif ($token->value === '=') {
$state = 1;
}
}
$expr->tokens[] = $token;
if ($state === 0) {
$expr->column .= $token->value;
} else { // } else if ($state === 1) {
$expr->value = $token->value;
}
}
// Last iteration was not saved.
if (!empty($expr->tokens)) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
}
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