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<?php
/**
* Defines the lexer of the library.
*
* This is one of the most important components, along with the parser.
*
* Depends on context to extract lexemes.
*/
declare(strict_types=1);
namespace PhpMyAdmin\SqlParser;
use PhpMyAdmin\SqlParser\Exceptions\LexerException;
use function define;
use function defined;
use function in_array;
use function mb_strlen;
use function sprintf;
use function strlen;
use function substr;
if (! defined('USE_UTF_STRINGS')) {
// NOTE: In previous versions of PHP (5.5 and older) the default
// internal encoding is "ISO-8859-1".
// All `mb_` functions must specify the correct encoding, which is
// 'UTF-8' in order to work properly.
/*
* Forces usage of `UtfString` if the string is multibyte.
* `UtfString` may be slower, but it gives better results.
*
* @var bool
*/
define('USE_UTF_STRINGS', true);
}
/**
* Performs lexical analysis over a SQL statement and splits it in multiple
* tokens.
*
* The output of the lexer is affected by the context of the SQL statement.
*
* @see Context
*/
class Lexer extends Core
{
/**
* A list of methods that are used in lexing the SQL query.
*
* @var array
*/
public static $PARSER_METHODS = [
// It is best to put the parsers in order of their complexity
// (ascending) and their occurrence rate (descending).
//
// Conflicts:
//
// 1. `parseDelimiter`, `parseUnknown`, `parseKeyword`, `parseNumber`
// They fight over delimiter. The delimiter may be a keyword, a
// number or almost any character which makes the delimiter one of
// the first tokens that must be parsed.
//
// 1. `parseNumber` and `parseOperator`
// They fight over `+` and `-`.
//
// 2. `parseComment` and `parseOperator`
// They fight over `/` (as in ```/*comment*/``` or ```a / b```)
//
// 3. `parseBool` and `parseKeyword`
// They fight over `TRUE` and `FALSE`.
//
// 4. `parseKeyword` and `parseUnknown`
// They fight over words. `parseUnknown` does not know about
// keywords.
'parseDelimiter',
'parseWhitespace',
'parseNumber',
'parseComment',
'parseOperator',
'parseBool',
'parseString',
'parseSymbol',
'parseKeyword',
'parseLabel',
'parseUnknown',
];
/**
* The string to be parsed.
*
* @var string|UtfString
*/
public $str = '';
/**
* The length of `$str`.
*
* By storing its length, a lot of time is saved, because parsing methods
* would call `strlen` everytime.
*
* @var int
*/
public $len = 0;
/**
* The index of the last parsed character.
*
* @var int
*/
public $last = 0;
/**
* Tokens extracted from given strings.
*
* @var TokensList
*/
public $list;
/**
* The default delimiter. This is used, by default, in all new instances.
*
* @var string
*/
public static $DEFAULT_DELIMITER = ';';
/**
* Statements delimiter.
* This may change during lexing.
*
* @var string
*/
public $delimiter;
/**
* The length of the delimiter.
*
* Because `parseDelimiter` can be called a lot, it would perform a lot of
* calls to `strlen`, which might affect performance when the delimiter is
* big.
*
* @var int
*/
public $delimiterLen;
/**
* Gets the tokens list parsed by a new instance of a lexer.
*
* @param string|UtfString $str the query to be lexed
* @param bool $strict whether strict mode should be
* enabled or not
* @param string $delimiter the delimiter to be used
*
* @return TokensList
*/
public static function getTokens($str, $strict = false, $delimiter = null)
{
$lexer = new self($str, $strict, $delimiter);
return $lexer->list;
}
/**
* @param string|UtfString $str the query to be lexed
* @param bool $strict whether strict mode should be
* enabled or not
* @param string $delimiter the delimiter to be used
*/
public function __construct($str, $strict = false, $delimiter = null)
{
// `strlen` is used instead of `mb_strlen` because the lexer needs to
// parse each byte of the input.
$len = $str instanceof UtfString ? $str->length() : strlen($str);
// For multi-byte strings, a new instance of `UtfString` is
// initialized (only if `UtfString` usage is forced.
if (! $str instanceof UtfString && USE_UTF_STRINGS && $len !== mb_strlen($str, 'UTF-8')) {
$str = new UtfString($str);
}
$this->str = $str;
$this->len = $str instanceof UtfString ? $str->length() : $len;
$this->strict = $strict;
// Setting the delimiter.
$this->setDelimiter(! empty($delimiter) ? $delimiter : static::$DEFAULT_DELIMITER);
$this->lex();
}
/**
* Sets the delimiter.
*
* @param string $delimiter the new delimiter
*/
public function setDelimiter($delimiter)
{
$this->delimiter = $delimiter;
$this->delimiterLen = strlen($delimiter);
}
/**
* Parses the string and extracts lexemes.
*/
public function lex()
{
// TODO: Sometimes, static::parse* functions make unnecessary calls to
// is* functions. For a better performance, some rules can be deduced
// from context.
// For example, in `parseBool` there is no need to compare the token
// every time with `true` and `false`. The first step would be to
// compare with 'true' only and just after that add another letter from
// context and compare again with `false`.
// Another example is `parseComment`.
$list = new TokensList();
/**
* Last processed token.
*
* @var Token
*/
$lastToken = null;
for ($this->last = 0, $lastIdx = 0; $this->last < $this->len; $lastIdx = ++$this->last) {
/**
* The new token.
*
* @var Token
*/
$token = null;
foreach (static::$PARSER_METHODS as $method) {
$token = $this->$method();
if ($token) {
break;
}
}
if ($token === null) {
// @assert($this->last === $lastIdx);
$token = new Token($this->str[$this->last]);
$this->error('Unexpected character.', $this->str[$this->last], $this->last);
} elseif (
$lastToken !== null
&& $token->type === Token::TYPE_SYMBOL
&& $token->flags & Token::FLAG_SYMBOL_VARIABLE
&& (
$lastToken->type === Token::TYPE_STRING
|| (
$lastToken->type === Token::TYPE_SYMBOL
&& $lastToken->flags & Token::FLAG_SYMBOL_BACKTICK
)
)
) {
// Handles ```... FROM 'user'@'%' ...```.
$lastToken->token .= $token->token;
$lastToken->type = Token::TYPE_SYMBOL;
$lastToken->flags = Token::FLAG_SYMBOL_USER;
$lastToken->value .= '@' . $token->value;
continue;
} elseif (
$lastToken !== null
&& $token->type === Token::TYPE_KEYWORD
&& $lastToken->type === Token::TYPE_OPERATOR
&& $lastToken->value === '.'
) {
// Handles ```... tbl.FROM ...```. In this case, FROM is not
// a reserved word.
$token->type = Token::TYPE_NONE;
$token->flags = 0;
$token->value = $token->token;
}
$token->position = $lastIdx;
$list->tokens[$list->count++] = $token;
// Handling delimiters.
if ($token->type === Token::TYPE_NONE && $token->value === 'DELIMITER') {
if ($this->last + 1 >= $this->len) {
$this->error('Expected whitespace(s) before delimiter.', '', $this->last + 1);
continue;
}
// Skipping last R (from `delimiteR`) and whitespaces between
// the keyword `DELIMITER` and the actual delimiter.
$pos = ++$this->last;
$token = $this->parseWhitespace();
if ($token !== null) {
$token->position = $pos;
$list->tokens[$list->count++] = $token;
}
// Preparing the token that holds the new delimiter.
if ($this->last + 1 >= $this->len) {
$this->error('Expected delimiter.', '', $this->last + 1);
continue;
}
$pos = $this->last + 1;
// Parsing the delimiter.
$this->delimiter = null;
$delimiterLen = 0;
while (
++$this->last < $this->len
&& ! Context::isWhitespace($this->str[$this->last])
&& $delimiterLen < 15
) {
$this->delimiter .= $this->str[$this->last];
++$delimiterLen;
}
if (empty($this->delimiter)) {
$this->error('Expected delimiter.', '', $this->last);
$this->delimiter = ';';
}
--$this->last;
// Saving the delimiter and its token.
$this->delimiterLen = strlen($this->delimiter);
$token = new Token($this->delimiter, Token::TYPE_DELIMITER);
$token->position = $pos;
$list->tokens[$list->count++] = $token;
}
$lastToken = $token;
}
// Adding a final delimiter to mark the ending.
$list->tokens[$list->count++] = new Token(null, Token::TYPE_DELIMITER);
// Saving the tokens list.
$this->list = $list;
$this->solveAmbiguityOnStarOperator();
}
/**
* Resolves the ambiguity when dealing with the "*" operator.
*
* In SQL statements, the "*" operator can be an arithmetic operator (like in 2*3) or an SQL wildcard (like in
* SELECT a.* FROM ...). To solve this ambiguity, the solution is to find the next token, excluding whitespaces and
* comments, right after the "*" position. The "*" is for sure an SQL wildcard if the next token found is any of:
* - "FROM" (the FROM keyword like in "SELECT * FROM...");
* - "USING" (the USING keyword like in "DELETE table_name.* USING...");
* - "," (a comma separator like in "SELECT *, field FROM...");
* - ")" (a closing parenthesis like in "COUNT(*)").
* This methods will change the flag of the "*" tokens when any of those condition above is true. Otherwise, the
* default flag (arithmetic) will be kept.
*
* @return void
*/
private function solveAmbiguityOnStarOperator()
{
$iBak = $this->list->idx;
while (($starToken = $this->list->getNextOfTypeAndValue(Token::TYPE_OPERATOR, '*')) !== null) {
// getNext() already gets rid of whitespaces and comments.
$next = $this->list->getNext();
if ($next === null) {
continue;
}
if (
($next->type !== Token::TYPE_KEYWORD || ! in_array($next->value, ['FROM', 'USING'], true))
&& ($next->type !== Token::TYPE_OPERATOR || ! in_array($next->value, [',', ')'], true))
) {
continue;
}
$starToken->flags = Token::FLAG_OPERATOR_SQL;
}
$this->list->idx = $iBak;
}
/**
* Creates a new error log.
*
* @param string $msg the error message
* @param string $str the character that produced the error
* @param int $pos the position of the character
* @param int $code the code of the error
*
* @throws LexerException throws the exception, if strict mode is enabled.
*/
public function error($msg, $str = '', $pos = 0, $code = 0)
{
$error = new LexerException(
Translator::gettext($msg),
$str,
$pos,
$code
);
parent::error($error);
}
/**
* Parses a keyword.
*
* @return Token|null
*/
public function parseKeyword()
{
$token = '';
/**
* Value to be returned.
*
* @var Token
*/
$ret = null;
/**
* The value of `$this->last` where `$token` ends in `$this->str`.
*
* @var int
*/
$iEnd = $this->last;
/**
* Whether last parsed character is a whitespace.
*
* @var bool
*/
$lastSpace = false;
for ($j = 1; $j < Context::KEYWORD_MAX_LENGTH && $this->last < $this->len; ++$j, ++$this->last) {
// Composed keywords shouldn't have more than one whitespace between
// keywords.
if (Context::isWhitespace($this->str[$this->last])) {
if ($lastSpace) {
--$j; // The size of the keyword didn't increase.
continue;
}
$lastSpace = true;
} else {
$lastSpace = false;
}
$token .= $this->str[$this->last];
$flags = Context::isKeyword($token);
if (($this->last + 1 !== $this->len && ! Context::isSeparator($this->str[$this->last + 1])) || ! $flags) {
continue;
}
$ret = new Token($token, Token::TYPE_KEYWORD, $flags);
$iEnd = $this->last;
// We don't break so we find longest keyword.
// For example, `OR` and `ORDER` have a common prefix `OR`.
// If we stopped at `OR`, the parsing would be invalid.
}
$this->last = $iEnd;
return $ret;
}
/**
* Parses a label.
*
* @return Token|null
*/
public function parseLabel()
{
$token = '';
/**
* Value to be returned.
*
* @var Token
*/
$ret = null;
/**
* The value of `$this->last` where `$token` ends in `$this->str`.
*
* @var int
*/
$iEnd = $this->last;
for ($j = 1; $j < Context::LABEL_MAX_LENGTH && $this->last < $this->len; ++$j, ++$this->last) {
if ($this->str[$this->last] === ':' && $j > 1) {
// End of label
$token .= $this->str[$this->last];
$ret = new Token($token, Token::TYPE_LABEL);
$iEnd = $this->last;
break;
}
if (Context::isWhitespace($this->str[$this->last]) && $j > 1) {
// Whitespace between label and :
// The size of the keyword didn't increase.
--$j;
} elseif (Context::isSeparator($this->str[$this->last])) {
// Any other separator
break;
}
$token .= $this->str[$this->last];
}
$this->last = $iEnd;
return $ret;
}
/**
* Parses an operator.
*
* @return Token|null
*/
public function parseOperator()
{
$token = '';
/**
* Value to be returned.
*
* @var Token
*/
$ret = null;
/**
* The value of `$this->last` where `$token` ends in `$this->str`.
*
* @var int
*/
$iEnd = $this->last;
for ($j = 1; $j < Context::OPERATOR_MAX_LENGTH && $this->last < $this->len; ++$j, ++$this->last) {
$token .= $this->str[$this->last];
$flags = Context::isOperator($token);
if (! $flags) {
continue;
}
$ret = new Token($token, Token::TYPE_OPERATOR, $flags);
$iEnd = $this->last;
}
$this->last = $iEnd;
return $ret;
}
/**
* Parses a whitespace.
*
* @return Token|null
*/
public function parseWhitespace()
{
$token = $this->str[$this->last];
if (! Context::isWhitespace($token)) {
return null;
}
while (++$this->last < $this->len && Context::isWhitespace($this->str[$this->last])) {
$token .= $this->str[$this->last];
}
--$this->last;
return new Token($token, Token::TYPE_WHITESPACE);
}
/**
* Parses a comment.
*
* @return Token|null
*/
public function parseComment()
{
$iBak = $this->last;
$token = $this->str[$this->last];
// Bash style comments. (#comment\n)
if (Context::isComment($token)) {
while (++$this->last < $this->len && $this->str[$this->last] !== "\n") {
$token .= $this->str[$this->last];
}
// Include trailing \n as whitespace token
if ($this->last < $this->len) {
--$this->last;
}
return new Token($token, Token::TYPE_COMMENT, Token::FLAG_COMMENT_BASH);
}
// C style comments. (/*comment*\/)
if (++$this->last < $this->len) {
$token .= $this->str[$this->last];
if (Context::isComment($token)) {
// There might be a conflict with "*" operator here, when string is "*/*".
// This can occurs in the following statements:
// - "SELECT */* comment */ FROM ..."
// - "SELECT 2*/* comment */3 AS `six`;"
$next = $this->last + 1;
if (($next < $this->len) && $this->str[$next] === '*') {
// Conflict in "*/*": first "*" was not for ending a comment.
// Stop here and let other parsing method define the true behavior of that first star.
$this->last = $iBak;
return null;
}
$flags = Token::FLAG_COMMENT_C;
// This comment already ended. It may be a part of a
// previous MySQL specific command.
if ($token === '*/') {
return new Token($token, Token::TYPE_COMMENT, $flags);
}
// Checking if this is a MySQL-specific command.
if ($this->last + 1 < $this->len && $this->str[$this->last + 1] === '!') {
$flags |= Token::FLAG_COMMENT_MYSQL_CMD;
$token .= $this->str[++$this->last];
while (
++$this->last < $this->len
&& $this->str[$this->last] >= '0'
&& $this->str[$this->last] <= '9'
) {
$token .= $this->str[$this->last];
}
--$this->last;
// We split this comment and parse only its beginning
// here.
return new Token($token, Token::TYPE_COMMENT, $flags);
}
// Parsing the comment.
while (
++$this->last < $this->len
&& (
$this->str[$this->last - 1] !== '*'
|| $this->str[$this->last] !== '/'
)
) {
$token .= $this->str[$this->last];
}
// Adding the ending.
if ($this->last < $this->len) {
$token .= $this->str[$this->last];
}
return new Token($token, Token::TYPE_COMMENT, $flags);
}
}
// SQL style comments. (-- comment\n)
if (++$this->last < $this->len) {
$token .= $this->str[$this->last];
$end = false;
} else {
--$this->last;
$end = true;
}
if (Context::isComment($token, $end)) {
// Checking if this comment did not end already (```--\n```).
if ($this->str[$this->last] !== "\n") {
while (++$this->last < $this->len && $this->str[$this->last] !== "\n") {
$token .= $this->str[$this->last];
}
}
// Include trailing \n as whitespace token
if ($this->last < $this->len) {
--$this->last;
}
return new Token($token, Token::TYPE_COMMENT, Token::FLAG_COMMENT_SQL);
}
$this->last = $iBak;
return null;
}
/**
* Parses a boolean.
*
* @return Token|null
*/
public function parseBool()
{
if ($this->last + 3 >= $this->len) {
// At least `min(strlen('TRUE'), strlen('FALSE'))` characters are
// required.
return null;
}
$iBak = $this->last;
$token = $this->str[$this->last] . $this->str[++$this->last]
. $this->str[++$this->last] . $this->str[++$this->last]; // _TRUE_ or _FALS_e
if (Context::isBool($token)) {
return new Token($token, Token::TYPE_BOOL);
}
if (++$this->last < $this->len) {
$token .= $this->str[$this->last]; // fals_E_
if (Context::isBool($token)) {
return new Token($token, Token::TYPE_BOOL, 1);
}
}
$this->last = $iBak;
return null;
}
/**
* Parses a number.
*
* @return Token|null
*/
public function parseNumber()
{
// A rudimentary state machine is being used to parse numbers due to
// the various forms of their notation.
//
// Below are the states of the machines and the conditions to change
// the state.
//
// 1 --------------------[ + or - ]-------------------> 1
// 1 -------------------[ 0x or 0X ]------------------> 2
// 1 --------------------[ 0 to 9 ]-------------------> 3
// 1 -----------------------[ . ]---------------------> 4
// 1 -----------------------[ b ]---------------------> 7
//
// 2 --------------------[ 0 to F ]-------------------> 2
//
// 3 --------------------[ 0 to 9 ]-------------------> 3
// 3 -----------------------[ . ]---------------------> 4
// 3 --------------------[ e or E ]-------------------> 5
//
// 4 --------------------[ 0 to 9 ]-------------------> 4
// 4 --------------------[ e or E ]-------------------> 5
//
// 5 ---------------[ + or - or 0 to 9 ]--------------> 6
//
// 7 -----------------------[ ' ]---------------------> 8
//
// 8 --------------------[ 0 or 1 ]-------------------> 8
// 8 -----------------------[ ' ]---------------------> 9
//
// State 1 may be reached by negative numbers.
// State 2 is reached only by hex numbers.
// State 4 is reached only by float numbers.
// State 5 is reached only by numbers in approximate form.
// State 7 is reached only by numbers in bit representation.
//
// Valid final states are: 2, 3, 4 and 6. Any parsing that finished in a
// state other than these is invalid.
// Also, negative states are invalid states.
$iBak = $this->last;
$token = '';
$flags = 0;
$state = 1;
for (; $this->last < $this->len; ++$this->last) {
if ($state === 1) {
if ($this->str[$this->last] === '-') {
$flags |= Token::FLAG_NUMBER_NEGATIVE;
} elseif (
$this->last + 1 < $this->len
&& $this->str[$this->last] === '0'
&& (
$this->str[$this->last + 1] === 'x'
|| $this->str[$this->last + 1] === 'X'
)
) {
$token .= $this->str[$this->last++];
$state = 2;
} elseif ($this->str[$this->last] >= '0' && $this->str[$this->last] <= '9') {
$state = 3;
} elseif ($this->str[$this->last] === '.') {
$state = 4;
} elseif ($this->str[$this->last] === 'b') {
$state = 7;
} elseif ($this->str[$this->last] !== '+') {
// `+` is a valid character in a number.
break;
}
} elseif ($state === 2) {
$flags |= Token::FLAG_NUMBER_HEX;
if (
! (
($this->str[$this->last] >= '0' && $this->str[$this->last] <= '9')
|| ($this->str[$this->last] >= 'A' && $this->str[$this->last] <= 'F')
|| ($this->str[$this->last] >= 'a' && $this->str[$this->last] <= 'f')
)
) {
break;
}
} elseif ($state === 3) {
if ($this->str[$this->last] === '.') {
$state = 4;
} elseif ($this->str[$this->last] === 'e' || $this->str[$this->last] === 'E') {
$state = 5;
} elseif (
($this->str[$this->last] >= 'a' && $this->str[$this->last] <= 'z')
|| ($this->str[$this->last] >= 'A' && $this->str[$this->last] <= 'Z')
) {
// A number can't be directly followed by a letter
$state = -$state;
} elseif ($this->str[$this->last] < '0' || $this->str[$this->last] > '9') {
// Just digits and `.`, `e` and `E` are valid characters.
break;
}
} elseif ($state === 4) {
$flags |= Token::FLAG_NUMBER_FLOAT;
if ($this->str[$this->last] === 'e' || $this->str[$this->last] === 'E') {
$state = 5;
} elseif (
($this->str[$this->last] >= 'a' && $this->str[$this->last] <= 'z')
|| ($this->str[$this->last] >= 'A' && $this->str[$this->last] <= 'Z')
) {
// A number can't be directly followed by a letter
$state = -$state;
} elseif ($this->str[$this->last] < '0' || $this->str[$this->last] > '9') {
// Just digits, `e` and `E` are valid characters.
break;
}
} elseif ($state === 5) {
$flags |= Token::FLAG_NUMBER_APPROXIMATE;
if (
$this->str[$this->last] === '+' || $this->str[$this->last] === '-'
|| ($this->str[$this->last] >= '0' && $this->str[$this->last] <= '9')
) {
$state = 6;
} elseif (
($this->str[$this->last] >= 'a' && $this->str[$this->last] <= 'z')
|| ($this->str[$this->last] >= 'A' && $this->str[$this->last] <= 'Z')
) {
// A number can't be directly followed by a letter
$state = -$state;
} else {
break;
}
} elseif ($state === 6) {
if ($this->str[$this->last] < '0' || $this->str[$this->last] > '9') {
// Just digits are valid characters.
break;
}
} elseif ($state === 7) {
$flags |= Token::FLAG_NUMBER_BINARY;
if ($this->str[$this->last] !== '\'') {
break;
}
$state = 8;
} elseif ($state === 8) {
if ($this->str[$this->last] === '\'') {
$state = 9;
} elseif ($this->str[$this->last] !== '0' && $this->str[$this->last] !== '1') {
break;
}
} elseif ($state === 9) {
break;
}
$token .= $this->str[$this->last];
}
if ($state === 2 || $state === 3 || ($token !== '.' && $state === 4) || $state === 6 || $state === 9) {
--$this->last;
return new Token($token, Token::TYPE_NUMBER, $flags);
}
$this->last = $iBak;
return null;
}
/**
* Parses a string.
*
* @param string $quote additional starting symbol
*
* @return Token|null
*
* @throws LexerException
*/
public function parseString($quote = '')
{
$token = $this->str[$this->last];
$flags = Context::isString($token);
if (! $flags && $token !== $quote) {
return null;
}
$quote = $token;
while (++$this->last < $this->len) {
if (
$this->last + 1 < $this->len
&& (
($this->str[$this->last] === $quote && $this->str[$this->last + 1] === $quote)
|| ($this->str[$this->last] === '\\' && $quote !== '`')
)
) {
$token .= $this->str[$this->last] . $this->str[++$this->last];
} else {
if ($this->str[$this->last] === $quote) {
break;
}
$token .= $this->str[$this->last];
}
}
if ($this->last >= $this->len || $this->str[$this->last] !== $quote) {
$this->error(
sprintf(
Translator::gettext('Ending quote %1$s was expected.'),
$quote
),
'',
$this->last
);
} else {
$token .= $this->str[$this->last];
}
return new Token($token, Token::TYPE_STRING, $flags);
}
/**
* Parses a symbol.
*
* @return Token|null
*
* @throws LexerException
*/
public function parseSymbol()
{
$token = $this->str[$this->last];
$flags = Context::isSymbol($token);
if (! $flags) {
return null;
}
if ($flags & Token::FLAG_SYMBOL_VARIABLE) {
if ($this->last + 1 < $this->len && $this->str[++$this->last] === '@') {
// This is a system variable (e.g. `@@hostname`).
$token .= $this->str[$this->last++];
$flags |= Token::FLAG_SYMBOL_SYSTEM;
}
} elseif ($flags & Token::FLAG_SYMBOL_PARAMETER) {
if ($token !== '?' && $this->last + 1 < $this->len) {
++$this->last;
}
} else {
$token = '';
}
$str = null;
if ($this->last < $this->len) {
$str = $this->parseString('`');
if ($str === null) {
$str = $this->parseUnknown();
if ($str === null) {
$this->error('Variable name was expected.', $this->str[$this->last], $this->last);
}
}
}
if ($str !== null) {
$token .= $str->token;
}
return new Token($token, Token::TYPE_SYMBOL, $flags);
}
/**
* Parses unknown parts of the query.
*
* @return Token|null
*/
public function parseUnknown()
{
$token = $this->str[$this->last];
if (Context::isSeparator($token)) {
return null;
}
while (++$this->last < $this->len && ! Context::isSeparator($this->str[$this->last])) {
$token .= $this->str[$this->last];
// Test if end of token equals the current delimiter. If so, remove it from the token.
if (substr($token, -$this->delimiterLen) === $this->delimiter) {
$token = substr($token, 0, -$this->delimiterLen);
$this->last -= $this->delimiterLen - 1;
break;
}
}
--$this->last;
return new Token($token);
}
/**
* Parses the delimiter of the query.
*
* @return Token|null
*/
public function parseDelimiter()
{
$idx = 0;
while ($idx < $this->delimiterLen && $this->last + $idx < $this->len) {
if ($this->delimiter[$idx] !== $this->str[$this->last + $idx]) {
return null;
}
++$idx;
}
$this->last += $this->delimiterLen - 1;
return new Token($this->delimiter, Token::TYPE_DELIMITER);
}
}