PhpMyAdmin\SqlParser\Statement::parse()

Complexity

Conditions	31
Paths	16

Size

Total Lines	158
Code Lines	64

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	54
CRAP Score	34.6624

Importance

Changes	1
Bugs	0	Features	1

<?php
    public function parse(Parser $parser, TokensList $list): void
    {
        /**
         * Array containing all list of clauses parsed.
         * This is used to check for duplicates.
         */
        $parsedClauses = [];

        // This may be corrected by the parser.
        $this->first = $list->idx;

        /**
         * Whether options were parsed or not.
         * For statements that do not have any options this is set to `true` by
         * default.
         */
        $parsedOptions = static::$statementOptions === [];

        for (; $list->idx < $list->count; ++$list->idx) {
            /**
             * Token parsed at this moment.
             */
            $token = $list->tokens[$list->idx];

            // End of statement.
            if ($token->type === TokenType::Delimiter) {
                break;
            }

            // Checking if this closing bracket is the pair for a bracket
            // outside the statement.
            if (($token->value === ')') && ($parser->brackets > 0)) {
                --$parser->brackets;
                continue;
            }

            // Only keywords are relevant here. Other parts of the query are
            // processed in the functions below.
            if ($token->type !== TokenType::Keyword) {
                if (($token->type !== TokenType::Comment) && ($token->type !== TokenType::Whitespace)) {
                    $parser->error('Unexpected token.', $token);
                }

                continue;
            }

            // Unions are parsed by the parser because they represent more than
            // one statement.
            if (
                ($token->keyword === 'UNION') ||
                ($token->keyword === 'UNION ALL') ||
                ($token->keyword === 'UNION DISTINCT') ||
                ($token->keyword === 'EXCEPT') ||
                ($token->keyword === 'INTERSECT')
            ) {
                break;
            }

            $lastIdx = $list->idx;

            $list->idx = $lastIdx;

            /**
             * The name of the class that is used for parsing.
             */
            $class = null;

            /**
             * The name of the field where the result of the parsing is stored.
             */
            $field = null;

            /**
             * Parser's options.
             */
            $options = [];

            // Looking for duplicated clauses.
            if (isset(Parser::KEYWORD_PARSERS[$token->value]) || ! empty(Parser::STATEMENT_PARSERS[$token->value])) {
                if (! empty($parsedClauses[$token->value])) {
                    $parser->error('This type of clause was previously parsed.', $token);
                    break;
                }

                $parsedClauses[$token->value] = true;
            }

            // Checking if this is the beginning of a clause.
            // Fix Issue #221: As `truncate` is not a keyword
            // but it might be the beginning of a statement of truncate,
            // so let the value use the keyword field for truncate type.
            $tokenValue = in_array($token->keyword, ['TRUNCATE']) ? $token->keyword : $token->value;
            if (isset(Parser::KEYWORD_PARSERS[$tokenValue]) && $list->idx < $list->count) {
                $class = Parser::KEYWORD_PARSERS[$tokenValue]['class'];
                $field = Parser::KEYWORD_PARSERS[$tokenValue]['field'];
                if (! empty(Parser::KEYWORD_PARSERS[$tokenValue]['options'])) {
                    $options = Parser::KEYWORD_PARSERS[$tokenValue]['options'];
                }
            }

            // Checking if this is the beginning of the statement.
            if (! empty(Parser::STATEMENT_PARSERS[$token->keyword])) {
                if (
                    ! empty(static::$clauses) // Undefined for some statements.
                    && empty(static::$clauses[$token->value])
                ) {
                    // Some keywords (e.g. `SET`) may be the beginning of a
                    // statement and a clause.
                    // If such keyword was found and it cannot be a clause of
                    // this statement it means it is a new statement, but no
                    // delimiter was found between them.
                    $parser->error(
                        'A new statement was found, but no delimiter between it and the previous one.',
                        $token,
                    );
                    break;
                }

                if (! $parsedOptions) {
                    if (! array_key_exists((string) $token->value, static::$statementOptions)) {
                        // Skipping keyword because if it is not a option.
                        ++$list->idx;
                    }

                    $this->options = OptionsArrays::parse($parser, $list, static::$statementOptions);
                    $parsedOptions = true;
                }
            } elseif ($class === null) {
                if (! ($this instanceof SetStatement) || ($token->value !== 'COLLATE' && $token->value !== 'DEFAULT')) {
                    // There is no parser for this keyword and isn't the beginning
                    // of a statement (so no options) either.
                    $parser->error('Unrecognized keyword.', $token);
                    continue;
                }

                // Handle special end options in SET statement
                $this->endOptions = OptionsArrays::parse($parser, $list, SetStatement::STATEMENT_END_OPTIONS);
            }

            $this->before($parser, $list, $token);

            // Parsing this keyword.
            if ($class !== null) {
                // We can't parse keyword at the end of statement
                if ($list->idx >= $list->count) {
                    $parser->error('Keyword at end of statement.', $token);
                    continue;
                }

                ++$list->idx; // Skipping keyword or last option.
                $this->$field = $class::parse($parser, $list, $options);
            }

            $this->after($parser, $list, $token);
        }

        // This may be corrected by the parser.
        $this->last = --$list->idx; // Go back to last used token.
    }