130 lines
3.5 KiB
PHP
130 lines
3.5 KiB
PHP
<?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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* @package SqlParser
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* @subpackage Components
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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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* @package SqlParser
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* @subpackage Components
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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 $state
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*/
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$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 $token
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*/
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$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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* @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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