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314 lines
9.4 KiB
PHP
314 lines
9.4 KiB
PHP
<?php
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/**
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* @link https://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license https://www.yiiframework.com/license/
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*/
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namespace yii\db;
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use yii\base\BaseObject;
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/**
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* SqlToken represents SQL tokens produced by [[SqlTokenizer]] or its child classes.
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*
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* @property SqlToken[] $children Child tokens.
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* @property-read bool $hasChildren Whether the token has children.
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* @property-read bool $isCollection Whether the token represents a collection of tokens.
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* @property-read string $sql SQL code.
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*
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* @author Sergey Makinen <sergey@makinen.ru>
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* @since 2.0.13
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*/
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class SqlToken extends BaseObject implements \ArrayAccess
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{
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const TYPE_CODE = 0;
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const TYPE_STATEMENT = 1;
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const TYPE_TOKEN = 2;
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const TYPE_PARENTHESIS = 3;
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const TYPE_KEYWORD = 4;
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const TYPE_OPERATOR = 5;
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const TYPE_IDENTIFIER = 6;
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const TYPE_STRING_LITERAL = 7;
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/**
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* @var int token type. It has to be one of the following constants:
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*
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* - [[TYPE_CODE]]
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* - [[TYPE_STATEMENT]]
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* - [[TYPE_TOKEN]]
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* - [[TYPE_PARENTHESIS]]
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* - [[TYPE_KEYWORD]]
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* - [[TYPE_OPERATOR]]
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* - [[TYPE_IDENTIFIER]]
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* - [[TYPE_STRING_LITERAL]]
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*/
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public $type = self::TYPE_TOKEN;
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/**
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* @var string|null token content.
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*/
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public $content;
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/**
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* @var int original SQL token start position.
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*/
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public $startOffset;
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/**
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* @var int original SQL token end position.
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*/
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public $endOffset;
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/**
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* @var SqlToken parent token.
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*/
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public $parent;
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/**
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* @var SqlToken[] token children.
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*/
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private $_children = [];
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/**
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* Returns the SQL code representing the token.
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* @return string SQL code.
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*/
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public function __toString()
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{
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return $this->getSql();
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}
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/**
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* Returns whether there is a child token at the specified offset.
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* This method is required by the SPL [[\ArrayAccess]] interface.
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* It is implicitly called when you use something like `isset($token[$offset])`.
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* @param int $offset child token offset.
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* @return bool whether the token exists.
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*/
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#[\ReturnTypeWillChange]
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public function offsetExists($offset)
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{
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return isset($this->_children[$this->calculateOffset($offset)]);
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}
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/**
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* Returns a child token at the specified offset.
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* This method is required by the SPL [[\ArrayAccess]] interface.
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* It is implicitly called when you use something like `$child = $token[$offset];`.
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* @param int $offset child token offset.
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* @return SqlToken|null the child token at the specified offset, `null` if there's no token.
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*/
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#[\ReturnTypeWillChange]
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public function offsetGet($offset)
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{
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$offset = $this->calculateOffset($offset);
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return isset($this->_children[$offset]) ? $this->_children[$offset] : null;
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}
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/**
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* Adds a child token to the token.
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* This method is required by the SPL [[\ArrayAccess]] interface.
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* It is implicitly called when you use something like `$token[$offset] = $child;`.
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* @param int|null $offset child token offset.
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* @param SqlToken $token token to be added.
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*/
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#[\ReturnTypeWillChange]
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public function offsetSet($offset, $token)
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{
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$token->parent = $this;
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if ($offset === null) {
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$this->_children[] = $token;
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} else {
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$this->_children[$this->calculateOffset($offset)] = $token;
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}
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$this->updateCollectionOffsets();
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}
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/**
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* Removes a child token at the specified offset.
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* This method is required by the SPL [[\ArrayAccess]] interface.
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* It is implicitly called when you use something like `unset($token[$offset])`.
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* @param int $offset child token offset.
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*/
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#[\ReturnTypeWillChange]
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public function offsetUnset($offset)
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{
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$offset = $this->calculateOffset($offset);
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if (isset($this->_children[$offset])) {
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array_splice($this->_children, $offset, 1);
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}
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$this->updateCollectionOffsets();
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}
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/**
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* Returns child tokens.
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* @return SqlToken[] child tokens.
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*/
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public function getChildren()
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{
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return $this->_children;
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}
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/**
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* Sets a list of child tokens.
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* @param SqlToken[] $children child tokens.
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*/
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public function setChildren($children)
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{
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$this->_children = [];
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foreach ($children as $child) {
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$child->parent = $this;
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$this->_children[] = $child;
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}
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$this->updateCollectionOffsets();
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}
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/**
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* Returns whether the token represents a collection of tokens.
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* @return bool whether the token represents a collection of tokens.
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*/
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public function getIsCollection()
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{
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return in_array($this->type, [
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self::TYPE_CODE,
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self::TYPE_STATEMENT,
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self::TYPE_PARENTHESIS,
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], true);
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}
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/**
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* Returns whether the token represents a collection of tokens and has non-zero number of children.
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* @return bool whether the token has children.
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*/
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public function getHasChildren()
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{
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return $this->getIsCollection() && !empty($this->_children);
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}
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/**
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* Returns the SQL code representing the token.
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* @return string SQL code.
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*/
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public function getSql()
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{
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$code = $this;
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while ($code->parent !== null) {
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$code = $code->parent;
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}
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return mb_substr($code->content, $this->startOffset, $this->endOffset - $this->startOffset, 'UTF-8');
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}
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/**
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* Returns whether this token (including its children) matches the specified "pattern" SQL code.
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*
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* Usage Example:
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*
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* ```php
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* $patternToken = (new \yii\db\sqlite\SqlTokenizer('SELECT any FROM any'))->tokenize();
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* if ($sqlToken->matches($patternToken, 0, $firstMatchIndex, $lastMatchIndex)) {
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* // ...
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* }
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* ```
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*
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* @param SqlToken $patternToken tokenized SQL code to match against. In addition to normal SQL, the
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* `any` keyword is supported which will match any number of keywords, identifiers, whitespaces.
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* @param int $offset token children offset to start lookup with.
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* @param int|null $firstMatchIndex token children offset where a successful match begins.
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* @param int|null $lastMatchIndex token children offset where a successful match ends.
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* @return bool whether this token matches the pattern SQL code.
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*/
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public function matches(SqlToken $patternToken, $offset = 0, &$firstMatchIndex = null, &$lastMatchIndex = null)
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{
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if (!$patternToken->getHasChildren()) {
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return false;
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}
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$patternToken = $patternToken[0];
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return $this->tokensMatch($patternToken, $this, $offset, $firstMatchIndex, $lastMatchIndex);
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}
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/**
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* Tests the given token to match the specified pattern token.
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* @param SqlToken $patternToken
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* @param SqlToken $token
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* @param int $offset
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* @param int|null $firstMatchIndex
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* @param int|null $lastMatchIndex
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* @return bool
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*/
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private function tokensMatch(SqlToken $patternToken, SqlToken $token, $offset = 0, &$firstMatchIndex = null, &$lastMatchIndex = null)
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{
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if (
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$patternToken->getIsCollection() !== $token->getIsCollection()
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|| (!$patternToken->getIsCollection() && $patternToken->content !== $token->content)
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) {
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return false;
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}
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if ($patternToken->children === $token->children) {
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$firstMatchIndex = $lastMatchIndex = $offset;
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return true;
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}
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$firstMatchIndex = $lastMatchIndex = null;
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$wildcard = false;
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for ($index = 0, $count = count($patternToken->children); $index < $count; $index++) {
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// Here we iterate token by token with an exception of "any" that toggles
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// an iteration until we matched with a next pattern token or EOF.
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if ($patternToken[$index]->content === 'any') {
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$wildcard = true;
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continue;
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}
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for ($limit = $wildcard ? count($token->children) : $offset + 1; $offset < $limit; $offset++) {
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if (!$wildcard && !isset($token[$offset])) {
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break;
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}
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if (!$this->tokensMatch($patternToken[$index], $token[$offset])) {
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continue;
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}
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if ($firstMatchIndex === null) {
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$firstMatchIndex = $offset;
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}
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$lastMatchIndex = $offset;
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$wildcard = false;
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$offset++;
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continue 2;
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}
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return false;
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}
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return true;
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}
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/**
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* Returns an absolute offset in the children array.
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* @param int $offset
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* @return int
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*/
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private function calculateOffset($offset)
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{
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if ($offset >= 0) {
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return $offset;
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}
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return count($this->_children) + $offset;
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}
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/**
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* Updates token SQL code start and end offsets based on its children.
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*/
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private function updateCollectionOffsets()
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{
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if (!empty($this->_children)) {
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$this->startOffset = reset($this->_children)->startOffset;
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$this->endOffset = end($this->_children)->endOffset;
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}
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if ($this->parent !== null) {
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$this->parent->updateCollectionOffsets();
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}
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}
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}
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