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<?php |
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/** |
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* Parses a list of expressions delimited by a comma. |
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*/ |
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namespace SqlParser\Components; |
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use SqlParser\Component; |
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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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* Parses a list of expressions delimited by a comma. |
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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 ExpressionArray extends Component |
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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 Expression[] |
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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 = array(); |
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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 ----------------------[ array ]---------------------> 1 |
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* |
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* 1 ------------------------[ , ]------------------------> 0 |
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* 1 -----------------------[ else ]----------------------> (END) |
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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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* |
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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) |
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&& ($token->flags & Token::FLAG_KEYWORD_RESERVED) |
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&& ((~$token->flags & Token::FLAG_KEYWORD_FUNCTION)) |
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&& ($token->value !== 'DUAL') |
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&& ($token->value !== 'NULL') |
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&& ($token->value !== 'CASE') |
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) { |
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// No keyword is expected. |
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break; |
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} |
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if ($state === 0) { |
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if ($token->type === Token::TYPE_KEYWORD |
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&& $token->value === 'CASE' |
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) { |
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$expr = CaseExpression::parse($parser, $list, $options); |
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} else { |
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$expr = Expression::parse($parser, $list, $options); |
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} |
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if ($expr === null) { |
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break; |
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} |
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$ret[] = $expr; |
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$state = 1; |
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} elseif ($state === 1) { |
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if ($token->value === ',') { |
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$state = 0; |
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} else { |
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break; |
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} |
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} |
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} |
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if ($state === 0) { |
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$parser->error( |
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__('An expression was expected.'), |
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$list->tokens[$list->idx] |
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); |
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} |
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--$list->idx; |
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return $ret; |
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} |
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/** |
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* @param Expression[] $component the component to be built |
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6 |
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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 $options = array()) |
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{ |
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$ret = array(); |
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foreach ($component as $frag) { |
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$ret[] = $frag::build($frag); |
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} |
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return implode($ret, ', '); |
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} |
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} |
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phpmyadmin /
sql-parser
