SqlTokenizer::isStringLiteral()

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by Carsten

created 2017-07-08 22:40 UTC

↳ Parent: SqlTokenizer

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<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\db;

use yii\base\Component;
use yii\base\InvalidParamException;

/**
 * SqlTokenizer splits an SQL query into individual SQL tokens.
 *
 * It can be used to obtain an addition information from an SQL code.
 *
 * Usage example:
 *
 * ```php
 * $tokenizer = new SqlTokenizer("SELECT * FROM user WHERE id = 1");
 * $root = $tokeinzer->tokenize();
 * $sqlTokens = $root->getChildren();
 * ```
 *
 * Tokens are instances of [[SqlToken]].
 *
 * @author Sergey Makinen <[email protected]>
 * @since 2.0.13
 */
abstract class SqlTokenizer extends Component
{
    /**
     * @var string SQL code.
     */
    public $sql;

    /**
     * @var int SQL code string length.
     */
    protected $length;
    /**
     * @var int SQL code string current offset.
     */
    protected $offset;

    /**
     * @var \SplStack stack of active tokens.
     */
    private $_tokenStack;
    /**
     * @var SqlToken active token. It's usually a top of the token stack.
     */
    private $_currentToken;
    /**
     * @var string[] cached substrings.
     */
    private $_substrings;
    /**
     * @var string current buffer value.
     */
    private $_buffer = '';
    /**
     * @var SqlToken resulting token of a last [[tokenize()]] call.
     */
    private $_token;


    /**
     * Constructor.
     * @param string $sql SQL code to be tokenized.
     * @param array $config name-value pairs that will be used to initialize the object properties
     */
    public function __construct($sql, $config = [])
    {
        $this->sql = $sql;
        parent::__construct($config);
    }

    /**
     * Tokenizes and returns a code type token.
     * @return SqlToken code type token.
     */
    public function tokenize()
    {
        $this->length = mb_strlen($this->sql, 'UTF-8');
        $this->offset = 0;
        $this->_substrings = [];
        $this->_buffer = '';
        $this->_token = new SqlToken([
            'type' => SqlToken::TYPE_CODE,
            'content' => $this->sql,
        ]);
        $this->_tokenStack = new \SplStack();
        $this->_tokenStack->push($this->_token);
        $this->_token[] = new SqlToken(['type' => SqlToken::TYPE_STATEMENT]);
        $this->_tokenStack->push($this->_token[0]);
        $this->_currentToken = $this->_tokenStack->top();
        while (!$this->isEof()) {
            if ($this->isWhitespace($length) || $this->isComment($length)) {
                $this->addTokenFromBuffer();
                $this->advance($length);
                continue;
            }

            if ($this->tokenizeOperator($length) || $this->tokenizeDelimitedString($length)) {
                $this->advance($length);
                continue;
            }

            $this->_buffer .= $this->substring(1);
            $this->advance(1);
        }
        $this->addTokenFromBuffer();
        if ($this->_token->getHasChildren() && !$this->_token[-1]->getHasChildren()) {
            unset($this->_token[-1]);
        }
        return $this->_token;
    }

    /**
     * Returns whether there's a whitespace at the current offset.
     * If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
     * @param int $length length of the matched string.
     * @return bool whether there's a whitespace at the current offset.
     */
    abstract protected function isWhitespace(&$length);

    /**
     * Returns whether there's a commentary at the current offset.
     * If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
     * @param int $length length of the matched string.
     * @return bool whether there's a commentary at the current offset.
     */
    abstract protected function isComment(&$length);

    /**
     * Returns whether there's an operator at the current offset.
     * If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
     * It may also set `$content` to a string that will be used as a token content.
     * @param int $length length of the matched string.
     * @param string $content optional content instead of the matched string.
     * @return bool whether there's an operator at the current offset.
     */
    abstract protected function isOperator(&$length, &$content);

    /**
     * Returns whether there's an identifier at the current offset.
     * If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
     * It may also set `$content` to a string that will be used as a token content.
     * @param int $length length of the matched string.
     * @param string $content optional content instead of the matched string.
     * @return bool whether there's an identifier at the current offset.
     */
    abstract protected function isIdentifier(&$length, &$content);

    /**
     * Returns whether there's a string literal at the current offset.
     * If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
     * It may also set `$content` to a string that will be used as a token content.
     * @param int $length length of the matched string.
     * @param string $content optional content instead of the matched string.
     * @return bool whether there's a string literal at the current offset.
     */
    abstract protected function isStringLiteral(&$length, &$content);

    /**
     * Returns whether the given string is a keyword.
     * The method may set `$content` to a string that will be used as a token content.
     * @param string $string string to be matched.
     * @param string $content optional content instead of the matched string.
     * @return bool whether the given string is a keyword.
     */
    abstract protected function isKeyword($string, &$content);

    /**
     * Returns whether the longest common prefix equals to the SQL code of the same length at the current offset.
     * @param string[] $with strings to be tested.
     * The method **will** modify this parameter to speed up lookups.
     * @param bool $caseSensitive whether to perform a case sensitive comparison.
     * @param int|null $length length of the matched string.
     * @param string|null $content matched string.
     * @return bool whether a match is found.
     */
    protected function startsWithAnyLongest(array &$with, $caseSensitive, &$length = null, &$content = null)
    {
        if (empty($with)) {
            return false;
        }

        if (!is_array(reset($with))) {
            usort($with, function ($string1, $string2) {
                return mb_strlen($string2, 'UTF-8') - mb_strlen($string1, 'UTF-8');
            });
            $map = [];
            foreach ($with as $string) {
                $map[mb_strlen($string, 'UTF-8')][$caseSensitive ? $string : mb_strtoupper($string, 'UTF-8')] = true;
            }
            $with = $map;
        }
        foreach ($with as $testLength => $testValues) {
            $content = $this->substring($testLength, $caseSensitive);
            if (isset($testValues[$content])) {
                $length = $testLength;
                return true;
            }
        }
        return false;
    }

    /**
     * Returns a string of the given length starting with the specified offset.
     * @param int $length string length to be returned.
     * @param bool $caseSensitive if it's `false`, the string will be uppercased.
     * @param int|null $offset SQL code offset, defaults to current if `null` is passed.
     * @return string result string, it may be empty if there's nothing to return.
     */
    protected function substring($length, $caseSensitive = true, $offset = null)
    {
        if ($offset === null) {
            $offset = $this->offset;
        }
        if ($offset + $length > $this->length) {
            return '';
        }

        $cacheKey = $offset . ',' . $length;
        if (!isset($this->_substrings[$cacheKey . ',1'])) {
            $this->_substrings[$cacheKey . ',1'] = mb_substr($this->sql, $offset, $length, 'UTF-8');
        }
        if (!$caseSensitive && !isset($this->_substrings[$cacheKey . ',0'])) {
            $this->_substrings[$cacheKey . ',0'] = mb_strtoupper($this->_substrings[$cacheKey . ',1'], 'UTF-8');
        }
        return $this->_substrings[$cacheKey . ',' . (int) $caseSensitive];
    }

    /**
     * Returns an index after the given string in the SQL code starting with the specified offset.
     * @param string $string string to be found.
     * @param int|null $offset SQL code offset, defaults to current if `null` is passed.
     * @return int index after the given string or end of string index.
     */
    protected function indexAfter($string, $offset = null)
    {
        if ($offset === null) {
            $offset = $this->offset;
        }
        if ($offset + mb_strlen($string, 'UTF-8') > $this->length) {
            return $this->length;
        }

        $afterIndexOf = mb_strpos($this->sql, $string, $offset, 'UTF-8');
        if ($afterIndexOf === false) {
            $afterIndexOf = $this->length;
        } else {
            $afterIndexOf += mb_strlen($string, 'UTF-8');
        }
        return $afterIndexOf;
    }

    /**
     * Determines whether there is a delimited string at the current offset and adds it to the token children.
     * @param int $length
     * @return bool
     */
    private function tokenizeDelimitedString(&$length)
    {
        $isIdentifier = $this->isIdentifier($length, $content);
        $isStringLiteral = !$isIdentifier && $this->isStringLiteral($length, $content);
        if (!$isIdentifier && !$isStringLiteral) {
            return false;
        }

        $this->addTokenFromBuffer();
        $this->_currentToken[] = new SqlToken([
            'type' => $isIdentifier ? SqlToken::TYPE_IDENTIFIER : SqlToken::TYPE_STRING_LITERAL,
            'content' => is_string($content) ? $content : $this->substring($length),
            'startOffset' => $this->offset,
            'endOffset' => $this->offset + $length,
        ]);
        return true;
    }

    /**
     * Determines whether there is an operator at the current offset and adds it to the token children.
     * @param int $length
     * @return bool
     */
    private function tokenizeOperator(&$length)
    {
        if (!$this->isOperator($length, $content)) {
            return false;
        }

        $this->addTokenFromBuffer();
        switch ($this->substring($length)) {
            case '(':
                $this->_currentToken[] = new SqlToken([
                    'type' => SqlToken::TYPE_OPERATOR,
                    'content' => is_string($content) ? $content : $this->substring($length),
                    'startOffset' => $this->offset,
                    'endOffset' => $this->offset + $length,
                ]);
                $this->_currentToken[] = new SqlToken(['type' => SqlToken::TYPE_PARENTHESIS]);
                $this->_tokenStack->push($this->_currentToken[-1]);
                $this->_currentToken = $this->_tokenStack->top();
                break;
            case ')':
                $this->_tokenStack->pop();
                $this->_currentToken = $this->_tokenStack->top();
                $this->_currentToken[] = new SqlToken([
                    'type' => SqlToken::TYPE_OPERATOR,
                    'content' => ')',
                    'startOffset' => $this->offset,
                    'endOffset' => $this->offset + $length,
                ]);
                break;
            case ';':
                if (!$this->_currentToken->getHasChildren()) {
                    break;
                }

                $this->_currentToken[] = new SqlToken([
                    'type' => SqlToken::TYPE_OPERATOR,
                    'content' => is_string($content) ? $content : $this->substring($length),
                    'startOffset' => $this->offset,
                    'endOffset' => $this->offset + $length,
                ]);
                $this->_tokenStack->pop();
                $this->_currentToken = $this->_tokenStack->top();
                $this->_currentToken[] = new SqlToken(['type' => SqlToken::TYPE_STATEMENT]);
                $this->_tokenStack->push($this->_currentToken[-1]);
                $this->_currentToken = $this->_tokenStack->top();
                break;
            default:
                $this->_currentToken[] = new SqlToken([
                    'type' => SqlToken::TYPE_OPERATOR,
                    'content' => is_string($content) ? $content : $this->substring($length),
                    'startOffset' => $this->offset,
                    'endOffset' => $this->offset + $length,
                ]);
                break;
        }
        return true;
    }

    /**
     * Determines a type of text in the buffer, tokenizes it and adds it to the token children.
     */
    private function addTokenFromBuffer()
    {
        if ($this->_buffer === '') {
            return;
        }

        $isKeyword = $this->isKeyword($this->_buffer, $content);
        $this->_currentToken[] = new SqlToken([
            'type' => $isKeyword ? SqlToken::TYPE_KEYWORD : SqlToken::TYPE_TOKEN,
            'content' => is_string($content) ? $content : $this->_buffer,
            'startOffset' => $this->offset - mb_strlen($this->_buffer, 'UTF-8'),
            'endOffset' => $this->offset,
        ]);
        $this->_buffer = '';
    }

    /**
     * Adds the specified length to the current offset.
     * @param int $length
     * @throws InvalidParamException
     */
    private function advance($length)
    {
        if ($length <= 0) {
            throw new InvalidParamException('Length must be greater than 0.');
        }

        $this->offset += $length;
        $this->_substrings = [];
    }

    /**
     * Returns whether the SQL code is completely traversed.
     * @return bool
     */
    private function isEof()
    {
        return $this->offset >= $this->length;
    }
}


1		<?php
2		/**
3		* @link http://www.yiiframework.com/
4		* @copyright Copyright (c) 2008 Yii Software LLC
5		* @license http://www.yiiframework.com/license/
6		*/
7
8		namespace yii\db;
9
10		use yii\base\Component;
11		use yii\base\InvalidParamException;
12
13		/**
14		* SqlTokenizer splits an SQL query into individual SQL tokens.
15		*
16		* It can be used to obtain an addition information from an SQL code.
17		*
18		* Usage example:
19		*
20		* ```php
21		* $tokenizer = new SqlTokenizer("SELECT * FROM user WHERE id = 1");
22		* $root = $tokeinzer->tokenize();
23		* $sqlTokens = $root->getChildren();
24		* ```
25		*
26		* Tokens are instances of [[SqlToken]].
27		*
28		* @author Sergey Makinen <[email protected]>
29		* @since 2.0.13
30		*/
31		abstract class SqlTokenizer extends Component
32		{
33		/**
34		* @var string SQL code.
35		*/
36		public $sql;
37
38		/**
39		* @var int SQL code string length.
40		*/
41		protected $length;
42		/**
43		* @var int SQL code string current offset.
44		*/
45		protected $offset;
46
47		/**
48		* @var \SplStack stack of active tokens.
49		*/
50		private $_tokenStack;
51		/**
52		* @var SqlToken active token. It's usually a top of the token stack.
53		*/
54		private $_currentToken;
55		/**
56		* @var string[] cached substrings.
57		*/
58		private $_substrings;
59		/**
60		* @var string current buffer value.
61		*/
62		private $_buffer = '';
63		/**
64		* @var SqlToken resulting token of a last [[tokenize()]] call.
65		*/
66		private $_token;
67
68
69		/**
70		* Constructor.
71		* @param string $sql SQL code to be tokenized.
72		* @param array $config name-value pairs that will be used to initialize the object properties
73		*/
74	13	public function __construct($sql, $config = [])
75		{
76	13	$this->sql = $sql;
77	13	parent::__construct($config);
78	13	}
79
80		/**
81		* Tokenizes and returns a code type token.
82		* @return SqlToken code type token.
83		*/
84	13	public function tokenize()
85		{
86	13	$this->length = mb_strlen($this->sql, 'UTF-8');
87	13	$this->offset = 0;
88	13	$this->_substrings = [];
89	13	$this->_buffer = '';
90	13	$this->_token = new SqlToken([
91	13	'type' => SqlToken::TYPE_CODE,
92	13	'content' => $this->sql,
93		]);
94	13	$this->_tokenStack = new \SplStack();
95	13	$this->_tokenStack->push($this->_token);
96	13	$this->_token[] = new SqlToken(['type' => SqlToken::TYPE_STATEMENT]);
97	13	$this->_tokenStack->push($this->_token[0]);
98	13	$this->_currentToken = $this->_tokenStack->top();
99	13	while (!$this->isEof()) {
100	13	if ($this->isWhitespace($length) \|\| $this->isComment($length)) {
101	13	$this->addTokenFromBuffer();
102	13	$this->advance($length);
103	13	continue;
104		}
105
106	13	if ($this->tokenizeOperator($length) \|\| $this->tokenizeDelimitedString($length)) {
107	13	$this->advance($length);
108	13	continue;
109		}
110
111	13	$this->_buffer .= $this->substring(1);
112	13	$this->advance(1);
113		}
114	13	$this->addTokenFromBuffer();
115	13	if ($this->_token->getHasChildren() && !$this->_token[-1]->getHasChildren()) {
116	1	unset($this->_token[-1]);
117		}
118	13	return $this->_token;
119		}
120
121		/**
122		* Returns whether there's a whitespace at the current offset.
123		* If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
124		* @param int $length length of the matched string.
125		* @return bool whether there's a whitespace at the current offset.
126		*/
127		abstract protected function isWhitespace(&$length);
128
129		/**
130		* Returns whether there's a commentary at the current offset.
131		* If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
132		* @param int $length length of the matched string.
133		* @return bool whether there's a commentary at the current offset.
134		*/
135		abstract protected function isComment(&$length);
136
137		/**
138		* Returns whether there's an operator at the current offset.
139		* If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
140		* It may also set `$content` to a string that will be used as a token content.
141		* @param int $length length of the matched string.
142		* @param string $content optional content instead of the matched string.
143		* @return bool whether there's an operator at the current offset.
144		*/
145		abstract protected function isOperator(&$length, &$content);
146
147		/**
148		* Returns whether there's an identifier at the current offset.
149		* If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
150		* It may also set `$content` to a string that will be used as a token content.
151		* @param int $length length of the matched string.
152		* @param string $content optional content instead of the matched string.
153		* @return bool whether there's an identifier at the current offset.
154		*/
155		abstract protected function isIdentifier(&$length, &$content);
156
157		/**
158		* Returns whether there's a string literal at the current offset.
159		* If this methos returns `true`, it has to set the `$length` parameter to the length of the matched string.
160		* It may also set `$content` to a string that will be used as a token content.
161		* @param int $length length of the matched string.
162		* @param string $content optional content instead of the matched string.
163		* @return bool whether there's a string literal at the current offset.
164		*/
165		abstract protected function isStringLiteral(&$length, &$content);
166
167		/**
168		* Returns whether the given string is a keyword.
169		* The method may set `$content` to a string that will be used as a token content.
170		* @param string $string string to be matched.
171		* @param string $content optional content instead of the matched string.
172		* @return bool whether the given string is a keyword.
173		*/
174		abstract protected function isKeyword($string, &$content);
175
176		/**
177		* Returns whether the longest common prefix equals to the SQL code of the same length at the current offset.
178		* @param string[] $with strings to be tested.
179		* The method will modify this parameter to speed up lookups.
180		* @param bool $caseSensitive whether to perform a case sensitive comparison.
181		* @param int\|null $length length of the matched string.
182		* @param string\|null $content matched string.
183		* @return bool whether a match is found.
184		*/
185	13	protected function startsWithAnyLongest(array &$with, $caseSensitive, &$length = null, &$content = null)
186		{
187	13	if (empty($with)) {
188		return false;
189		}
190
191	13	if (!is_array(reset($with))) {
192	1	usort($with, function ($string1, $string2) {
193	1	return mb_strlen($string2, 'UTF-8') - mb_strlen($string1, 'UTF-8');
194	1	});
195	1	$map = [];
196	1	foreach ($with as $string) {
197	1	$map[mb_strlen($string, 'UTF-8')][$caseSensitive ? $string : mb_strtoupper($string, 'UTF-8')] = true;
198		}
199	1	$with = $map;
200		}
201	13	foreach ($with as $testLength => $testValues) {
202	13	$content = $this->substring($testLength, $caseSensitive);
203	13	if (isset($testValues[$content])) {
204	13	$length = $testLength;
205	13	return true;
206		}
207		}
208	13	return false;
209		}
210
211		/**
212		* Returns a string of the given length starting with the specified offset.
213		* @param int $length string length to be returned.
214		* @param bool $caseSensitive if it's `false`, the string will be uppercased.
215		* @param int\|null $offset SQL code offset, defaults to current if `null` is passed.
216		* @return string result string, it may be empty if there's nothing to return.
217		*/
218	13	protected function substring($length, $caseSensitive = true, $offset = null)
219		{
220	13	if ($offset === null) {
221	13	$offset = $this->offset;
222		}
223	13	if ($offset + $length > $this->length) {
224	12	return '';
225		}
226
227	13	$cacheKey = $offset . ',' . $length;
228	13	if (!isset($this->_substrings[$cacheKey . ',1'])) {
229	13	$this->_substrings[$cacheKey . ',1'] = mb_substr($this->sql, $offset, $length, 'UTF-8');
230		}
231	13	if (!$caseSensitive && !isset($this->_substrings[$cacheKey . ',0'])) {
232		$this->_substrings[$cacheKey . ',0'] = mb_strtoupper($this->_substrings[$cacheKey . ',1'], 'UTF-8');
233		}
234	13	return $this->_substrings[$cacheKey . ',' . (int) $caseSensitive];
235		}
236
237		/**
238		* Returns an index after the given string in the SQL code starting with the specified offset.
239		* @param string $string string to be found.
240		* @param int\|null $offset SQL code offset, defaults to current if `null` is passed.
241		* @return int index after the given string or end of string index.
242		*/
243	13	protected function indexAfter($string, $offset = null)
244		{
245	13	if ($offset === null) {
246	1	$offset = $this->offset;
247		}
248	13	if ($offset + mb_strlen($string, 'UTF-8') > $this->length) {
249		return $this->length;
250		}
251
252	13	$afterIndexOf = mb_strpos($this->sql, $string, $offset, 'UTF-8');
253	13	if ($afterIndexOf === false) {
254	1	$afterIndexOf = $this->length;
255		} else {
256	13	$afterIndexOf += mb_strlen($string, 'UTF-8');
257		}
258	13	return $afterIndexOf;
259		}
260
261		/**
262		* Determines whether there is a delimited string at the current offset and adds it to the token children.
263		* @param int $length
264		* @return bool
265		*/
266	13	private function tokenizeDelimitedString(&$length)
267		{
268	13	$isIdentifier = $this->isIdentifier($length, $content);
269	13	$isStringLiteral = !$isIdentifier && $this->isStringLiteral($length, $content);
270	13	if (!$isIdentifier && !$isStringLiteral) {
271	13	return false;
272		}
273
274	13	$this->addTokenFromBuffer();
275	13	$this->_currentToken[] = new SqlToken([
276	13	'type' => $isIdentifier ? SqlToken::TYPE_IDENTIFIER : SqlToken::TYPE_STRING_LITERAL,
277	13	'content' => is_string($content) ? $content : $this->substring($length),
278	13	'startOffset' => $this->offset,
279	13	'endOffset' => $this->offset + $length,
280		]);
281	13	return true;
282		}
283
284		/**
285		* Determines whether there is an operator at the current offset and adds it to the token children.
286		* @param int $length
287		* @return bool
288		*/
289	13	private function tokenizeOperator(&$length)
290		{
291	13	if (!$this->isOperator($length, $content)) {
292	13	return false;
293		}
294
295	13	$this->addTokenFromBuffer();
296	13	switch ($this->substring($length)) {
297	13	case '(':
298	13	$this->_currentToken[] = new SqlToken([
299	13	'type' => SqlToken::TYPE_OPERATOR,
300	13	'content' => is_string($content) ? $content : $this->substring($length),
301	13	'startOffset' => $this->offset,
302	13	'endOffset' => $this->offset + $length,
303		]);
304	13	$this->_currentToken[] = new SqlToken(['type' => SqlToken::TYPE_PARENTHESIS]);
305	13	$this->_tokenStack->push($this->_currentToken[-1]);
306	13	$this->_currentToken = $this->_tokenStack->top();
307	13	break;
308	13	case ')':
309	13	$this->_tokenStack->pop();
310	13	$this->_currentToken = $this->_tokenStack->top();
311	13	$this->_currentToken[] = new SqlToken([
312	13	'type' => SqlToken::TYPE_OPERATOR,
313	13	'content' => ')',
314	13	'startOffset' => $this->offset,
315	13	'endOffset' => $this->offset + $length,
316		]);
317	13	break;
318	13	case ';':
319	1	if (!$this->_currentToken->getHasChildren()) {
320	1	break;
321		}
322
323	1	$this->_currentToken[] = new SqlToken([
324	1	'type' => SqlToken::TYPE_OPERATOR,
325	1	'content' => is_string($content) ? $content : $this->substring($length),
326	1	'startOffset' => $this->offset,
327	1	'endOffset' => $this->offset + $length,
328		]);
329	1	$this->_tokenStack->pop();
330	1	$this->_currentToken = $this->_tokenStack->top();
331	1	$this->_currentToken[] = new SqlToken(['type' => SqlToken::TYPE_STATEMENT]);
332	1	$this->_tokenStack->push($this->_currentToken[-1]);
333	1	$this->_currentToken = $this->_tokenStack->top();
334	1	break;
335		default:
336	13	$this->_currentToken[] = new SqlToken([
337	13	'type' => SqlToken::TYPE_OPERATOR,
338	13	'content' => is_string($content) ? $content : $this->substring($length),
339	13	'startOffset' => $this->offset,
340	13	'endOffset' => $this->offset + $length,
341		]);
342	13	break;
343		}
344	13	return true;
345		}
346
347		/**
348		* Determines a type of text in the buffer, tokenizes it and adds it to the token children.
349		*/
350	13	private function addTokenFromBuffer()
351		{
352	13	if ($this->_buffer === '') {
353	13	return;
354		}
355
356	13	$isKeyword = $this->isKeyword($this->_buffer, $content);
357	13	$this->_currentToken[] = new SqlToken([
358	13	'type' => $isKeyword ? SqlToken::TYPE_KEYWORD : SqlToken::TYPE_TOKEN,
359	13	'content' => is_string($content) ? $content : $this->_buffer,
360	13	'startOffset' => $this->offset - mb_strlen($this->_buffer, 'UTF-8'),
361	13	'endOffset' => $this->offset,
362		]);
363	13	$this->_buffer = '';
364	13	}
365
366		/**
367		* Adds the specified length to the current offset.
368		* @param int $length
369		* @throws InvalidParamException
370		*/
371	13	private function advance($length)
372		{
373	13	if ($length <= 0) {
374		throw new InvalidParamException('Length must be greater than 0.');
375		}
376
377	13	$this->offset += $length;
378	13	$this->_substrings = [];
379	13	}
380
381		/**
382		* Returns whether the SQL code is completely traversed.
383		* @return bool
384		*/
385	13	private function isEof()
386		{
387	13	return $this->offset >= $this->length;
388		}
389		}
390

yiisoft / yii2

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SqlTokenizer::isStringLiteral()

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