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<?php /** * Defines an array of tokens and utility functions to iterate through it. */ declare(strict_types=1); namespace PhpMyAdmin\SqlParser; use ArrayAccess; use function count; use function is_array; use function is_string; /** * A structure representing a list of tokens. */ class TokensList implements ArrayAccess { /** * The array of tokens. * * @var array */ public $tokens = []; /** * The count of tokens. * * @var int */ public $count = 0; /** * The index of the next token to be returned. * * @var int */ public $idx = 0; /** * @param array $tokens the initial array of tokens * @param int $count the count of tokens in the initial array */ public function __construct(array $tokens = [], $count = -1) { if (! empty($tokens)) { $this->tokens = $tokens; if ($count === -1) { $this->count = count($tokens); } } } /** * Builds an array of tokens by merging their raw value. * * @param string|Token[]|TokensList $list the tokens to be built * * @return string */ public static function build($list) { if (is_string($list)) { return $list; } if ($list instanceof self) { $list = $list->tokens; } $ret = ''; if (is_array($list)) { foreach ($list as $tok) { $ret .= $tok->token; } } return $ret; } /** * Adds a new token. * * @param Token $token token to be added in list */ public function add(Token $token) { $this->tokens[$this->count++] = $token; } /** * Gets the next token. Skips any irrelevant token (whitespaces and * comments). * * @return Token|null */ public function getNext() { for (; $this->idx < $this->count; ++$this->idx) { if (($this->tokens[$this->idx]->type !== Token::TYPE_WHITESPACE) && ($this->tokens[$this->idx]->type !== Token::TYPE_COMMENT) ) { return $this->tokens[$this->idx++]; } } return null; } /** * Gets the next token. * * @param int $type the type * * @return Token|null */ public function getNextOfType($type) { for (; $this->idx < $this->count; ++$this->idx) { if ($this->tokens[$this->idx]->type === $type) { return $this->tokens[$this->idx++]; } } return null; } /** * Gets the next token. * * @param int $type the type of the token * @param string $value the value of the token * * @return Token|null */ public function getNextOfTypeAndValue($type, $value) { for (; $this->idx < $this->count; ++$this->idx) { if (($this->tokens[$this->idx]->type === $type) && ($this->tokens[$this->idx]->value === $value) ) { return $this->tokens[$this->idx++]; } } return null; } /** * Sets an value inside the container. * * @param int $offset the offset to be set * @param Token $value the token to be saved */ public function offsetSet($offset, $value) { if ($offset === null) { $this->tokens[$this->count++] = $value; } else { $this->tokens[$offset] = $value; } } /** * Gets a value from the container. * * @param int $offset the offset to be returned * * @return Token */ public function offsetGet($offset) { return $offset < $this->count ? $this->tokens[$offset] : null; } /** * Checks if an offset was previously set. * * @param int $offset the offset to be checked * * @return bool */ public function offsetExists($offset) { return $offset < $this->count; } /** * Unsets the value of an offset. * * @param int $offset the offset to be unset */ public function offsetUnset($offset) { unset($this->tokens[$offset]); --$this->count; for ($i = $offset; $i < $this->count; ++$i) { $this->tokens[$i] = $this->tokens[$i + 1]; } unset($this->tokens[$this->count]); } }