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pma/vendor/phpmyadmin/sql-parser/src/Components/Condition.php
vendored
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239
pma/vendor/phpmyadmin/sql-parser/src/Components/Condition.php
vendored
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<?php
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declare(strict_types=1);
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namespace PhpMyAdmin\SqlParser\Components;
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use PhpMyAdmin\SqlParser\Component;
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use PhpMyAdmin\SqlParser\Parser;
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use PhpMyAdmin\SqlParser\Token;
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use PhpMyAdmin\SqlParser\TokensList;
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use function implode;
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use function in_array;
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use function is_array;
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use function trim;
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/**
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* `WHERE` keyword parser.
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*
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* @final
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*/
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class Condition extends Component
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{
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/**
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* Logical operators that can be used to delimit expressions.
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*
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* @var string[]
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*/
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public static $DELIMITERS = [
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'&&',
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'||',
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'AND',
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'OR',
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'XOR',
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];
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/**
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* List of allowed reserved keywords in conditions.
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*
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* @var array<string, int>
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*/
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public static $ALLOWED_KEYWORDS = [
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'ALL' => 1,
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'AND' => 1,
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'BETWEEN' => 1,
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'EXISTS' => 1,
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'IF' => 1,
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'IN' => 1,
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'INTERVAL' => 1,
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'IS' => 1,
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'LIKE' => 1,
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'MATCH' => 1,
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'NOT IN' => 1,
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'NOT NULL' => 1,
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'NOT' => 1,
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'NULL' => 1,
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'OR' => 1,
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'REGEXP' => 1,
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'RLIKE' => 1,
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'SOUNDS' => 1,
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'XOR' => 1,
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];
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/**
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* Identifiers recognized.
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*
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* @var array<int, mixed>
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*/
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public $identifiers = [];
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/**
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* Whether this component is an operator.
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*
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* @var bool
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*/
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public $isOperator = false;
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/**
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* The condition.
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*
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* @var string
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*/
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public $expr;
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/**
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* @param string $expr the condition or the operator
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*/
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public function __construct($expr = null)
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{
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$this->expr = trim((string) $expr);
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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<string, mixed> $options parameters for parsing
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*
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* @return Condition[]
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*/
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public static function parse(Parser $parser, TokensList $list, array $options = [])
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{
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$ret = [];
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$expr = new static();
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/**
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* Counts brackets.
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*
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* @var int
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*/
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$brackets = 0;
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/**
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* Whether there was a `BETWEEN` keyword before or not.
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*
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* It is required to keep track of them because their structure contains
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* the keyword `AND`, which is also an operator that delimits
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* expressions.
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*
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* @var bool
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*/
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$betweenBefore = false;
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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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$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_COMMENT) {
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continue;
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}
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// Replacing all whitespaces (new lines, tabs, etc.) with a single
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// space character.
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if ($token->type === Token::TYPE_WHITESPACE) {
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$expr->expr .= ' ';
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continue;
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}
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// Conditions are delimited by logical operators.
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if (in_array($token->value, static::$DELIMITERS, true)) {
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if ($betweenBefore && ($token->value === 'AND')) {
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// The syntax of keyword `BETWEEN` is hard-coded.
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$betweenBefore = false;
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} else {
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// The expression ended.
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$expr->expr = trim($expr->expr);
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if (! empty($expr->expr)) {
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$ret[] = $expr;
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}
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// Adding the operator.
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$expr = new static($token->value);
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$expr->isOperator = true;
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$ret[] = $expr;
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// Preparing to parse another condition.
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$expr = new static();
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continue;
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}
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}
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if (
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($token->type === Token::TYPE_KEYWORD)
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&& ($token->flags & Token::FLAG_KEYWORD_RESERVED)
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&& ! ($token->flags & Token::FLAG_KEYWORD_FUNCTION)
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) {
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if ($token->value === 'BETWEEN') {
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$betweenBefore = true;
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}
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if (($brackets === 0) && empty(static::$ALLOWED_KEYWORDS[$token->value])) {
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break;
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}
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}
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if ($token->type === Token::TYPE_OPERATOR) {
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if ($token->value === '(') {
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++$brackets;
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} elseif ($token->value === ')') {
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if ($brackets === 0) {
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break;
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}
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--$brackets;
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}
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}
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$expr->expr .= $token->token;
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if (
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($token->type !== Token::TYPE_NONE)
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&& (($token->type !== Token::TYPE_KEYWORD)
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|| ($token->flags & Token::FLAG_KEYWORD_RESERVED))
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&& ($token->type !== Token::TYPE_STRING)
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&& ($token->type !== Token::TYPE_SYMBOL)
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) {
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continue;
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}
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if (in_array($token->value, $expr->identifiers)) {
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continue;
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}
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$expr->identifiers[] = $token->value;
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}
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// Last iteration was not processed.
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$expr->expr = trim($expr->expr);
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if (! empty($expr->expr)) {
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$ret[] = $expr;
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}
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--$list->idx;
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return $ret;
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}
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/**
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* @param Condition[] $component the component to be built
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* @param array<string, mixed> $options parameters for building
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*
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* @return string
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*/
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public static function build($component, array $options = [])
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{
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if (is_array($component)) {
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return implode(' ', $component);
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}
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return $component->expr;
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}
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}
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