/**
* @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 OrderKeyword[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
$expr = new OrderKeyword();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 ----------------------[ field ]----------------------> 1
*
* 1 ------------------------[ , ]------------------------> 0
* 1 -------------------[ ASC / DESC ]--------------------> 1
*
* @var int
*/
$state = 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 || $token->type === Token::TYPE_COMMENT) {
continue;
}
if ($state === 0) {
$expr->field = FieldFragment::parse($parser, $list);
$state = 1;
} elseif ($state === 1) {
if ($token->type === Token::TYPE_KEYWORD && ($token->value === 'ASC' || $token->value === 'DESC')) {
$expr->type = $token->value;
} else {
if ($token->type === Token::TYPE_OPERATOR && $token->value === ',') {
if (!empty($expr->field)) {
$ret[] = $expr;
}
$expr = new OrderKeyword();
$state = 0;
} else {
break;
}
}
}
}
// Last iteration was not processed.
if (!empty($expr->field)) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}
/**
* Extracts the name of affected column.
*
* @param Parser $parser The instance that requests parsing.
* @param TokensList $list The list of tokens to be parsed.
* @param Token $token The token that is being parsed.
*
* @return void
*/
public function after(Parser $parser, TokensList $list, Token $token)
{
// Parsing operation.
++$list->idx;
$this->options->merge(OptionsFragment::parse($parser, $list, static::$OPTIONS));
// Parsing affected field.
++$list->idx;
$this->altered = FieldFragment::parse($parser, $list);
//
parent::after($parser, $list, $token);
}
/**
* @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 JoinKeyword
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = new JoinKeyword();
/**
* The state of the parser.
*
* Below are the states of the parser.
*
* 0 -----------------------[ expr ]----------------------> 1
*
* 1 ------------------------[ ON ]-----------------------> 2
*
* 2 --------------------[ conditions ]-------------------> -1
*
* @var int
*/
$state = 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 || $token->type === Token::TYPE_COMMENT) {
continue;
}
if ($state === 0) {
$ret->expr = FieldFragment::parse($parser, $list, array('skipColumn' => true));
$state = 1;
} elseif ($state === 1) {
if ($token->type === Token::TYPE_KEYWORD && $token->value === 'ON') {
$state = 2;
}
} elseif ($state === 2) {
$ret->on = WhereKeyword::parse($parser, $list);
++$list->idx;
break;
}
}
--$list->idx;
return $ret;
}
/**
* @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 FieldFragment[]
*/
public static function parse(Parser $parser, TokensList $list, array $options = array())
{
$ret = array();
$expr = null;
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 || $token->type === Token::TYPE_COMMENT) {
continue;
}
if ($token->type === Token::TYPE_KEYWORD && $token->flags & Token::FLAG_KEYWORD_RESERVED) {
// No keyword is expected.
break;
}
if ($token->type === Token::TYPE_OPERATOR && $token->value === ',') {
$ret[] = $expr;
} else {
$expr = FieldFragment::parse($parser, $list);
if ($expr === null) {
break;
}
}
}
// Last iteration was not processed.
if ($expr !== null) {
$ret[] = $expr;
}
--$list->idx;
return $ret;
}