Context::load() - Code Metrics - Inspection of "Upgrade phpmyadmin/coding-standard to 3.0.0" - phpmyadmin/sql-parser - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 0efc01...ef206b )

by Maurício

created 2021-04-19 19:42 UTC

Context::load() A

↳ Parent: Context

Complexity

Conditions	4
Paths	8

Size

Total Lines	17
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	9
CRAP Score	4

Importance

Changes

Metric	Value
cc	4
eloc	8
c	0
b	0
f	0
nc	8
nop	1
dl	0
loc	17
ccs	9
cts	9
cp	1
crap	4
rs	10

<?php
/**
 * Defines a context class that is later extended to define other contexts.
 *
 * A context is a collection of keywords, operators and functions used for
 * parsing.
 */

declare(strict_types=1);

namespace PhpMyAdmin\SqlParser;

use PhpMyAdmin\SqlParser\Exceptions\LoaderException;

use function class_exists;
use function constant;
use function explode;
use function intval;
use function is_array;
use function is_numeric;
use function str_replace;
use function strlen;
use function strncmp;
use function strtoupper;
use function substr;

/**
 * Holds the configuration of the context that is currently used.
 */
abstract class Context
{
    /**
     * The maximum length of a keyword.
     *
     * @see static::$TOKEN_KEYWORD
     */
    public const KEYWORD_MAX_LENGTH = 30;

    /**
     * The maximum length of a label.
     *
     * @see static::$TOKEN_LABEL
     * Ref: https://dev.mysql.com/doc/refman/5.7/en/statement-labels.html
     */
    public const LABEL_MAX_LENGTH = 16;

    /**
     * The maximum length of an operator.
     *
     * @see static::$TOKEN_OPERATOR
     */
    public const OPERATOR_MAX_LENGTH = 4;

    /**
     * The name of the default content.
     *
     * @var string
     */
    public static $defaultContext = '\\PhpMyAdmin\\SqlParser\\Contexts\\ContextMySql50700';

    /**
     * The name of the loaded context.
     *
     * @var string
     */
    public static $loadedContext = '\\PhpMyAdmin\\SqlParser\\Contexts\\ContextMySql50700';

    /**
     * The prefix concatenated to the context name when an incomplete class name
     * is specified.
     *
     * @var string
     */
    public static $contextPrefix = '\\PhpMyAdmin\\SqlParser\\Contexts\\Context';

    /**
     * List of keywords.
     *
     * Because, PHP's associative arrays are basically hash tables, it is more
     * efficient to store keywords as keys instead of values.
     *
     * The value associated to each keyword represents its flags.
     *
     * @see Token::FLAG_KEYWORD_RESERVED Token::FLAG_KEYWORD_COMPOSED
     *      Token::FLAG_KEYWORD_DATA_TYPE Token::FLAG_KEYWORD_KEY
     *      Token::FLAG_KEYWORD_FUNCTION
     *
     * Elements are sorted by flags, length and keyword.
     *
     * @var array
     */
    public static $KEYWORDS = [];

    /**
     * List of operators and their flags.
     *
     * @var array
     */
    public static $OPERATORS = [
        // Some operators (*, =) may have ambiguous flags, because they depend on
        // the context they are being used in.
        // For example: 1. SELECT * FROM table; # SQL specific (wildcard)
        //                 SELECT 2 * 3;        # arithmetic
        //              2. SELECT * FROM table WHERE foo = 'bar';
        //                 SET @i = 0;

        // @see Token::FLAG_OPERATOR_ARITHMETIC
        '%' => 1,
        '*' => 1,
        '+' => 1,
        '-' => 1,
        '/' => 1,

        // @see Token::FLAG_OPERATOR_LOGICAL
        '!' => 2,
        '!=' => 2,
        '&&' => 2,
        '<' => 2,
        '<=' => 2,
        '<=>' => 2,
        '<>' => 2,
        '=' => 2,
        '>' => 2,
        '>=' => 2,
        '||' => 2,

        // @see Token::FLAG_OPERATOR_BITWISE
        '&' => 4,
        '<<' => 4,
        '>>' => 4,
        '^' => 4,
        '|' => 4,
        '~' => 4,

        // @see Token::FLAG_OPERATOR_ASSIGNMENT
        ':=' => 8,

        // @see Token::FLAG_OPERATOR_SQL
        '(' => 16,
        ')' => 16,
        '.' => 16,
        ',' => 16,
        ';' => 16,
    ];

    /**
     * The mode of the MySQL server that will be used in lexing, parsing and
     * building the statements.
     *
     * @var int
     */
    public static $MODE = 0;

    /*
     * Server SQL Modes
     * https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html
     */

    // Compatibility mode for Microsoft's SQL server.
    // This is the equivalent of ANSI_QUOTES.
    public const SQL_MODE_COMPAT_MYSQL = 2;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_allow_invalid_dates
    public const SQL_MODE_ALLOW_INVALID_DATES = 1;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_ansi_quotes
    public const SQL_MODE_ANSI_QUOTES = 2;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_error_for_division_by_zero
    public const SQL_MODE_ERROR_FOR_DIVISION_BY_ZERO = 4;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_high_not_precedence
    public const SQL_MODE_HIGH_NOT_PRECEDENCE = 8;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_ignore_space
    public const SQL_MODE_IGNORE_SPACE = 16;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_auto_create_user
    public const SQL_MODE_NO_AUTO_CREATE_USER = 32;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_auto_value_on_zero
    public const SQL_MODE_NO_AUTO_VALUE_ON_ZERO = 64;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_backslash_escapes
    public const SQL_MODE_NO_BACKSLASH_ESCAPES = 128;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_dir_in_create
    public const SQL_MODE_NO_DIR_IN_CREATE = 256;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_dir_in_create
    public const SQL_MODE_NO_ENGINE_SUBSTITUTION = 512;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_field_options
    public const SQL_MODE_NO_FIELD_OPTIONS = 1024;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_key_options
    public const SQL_MODE_NO_KEY_OPTIONS = 2048;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_table_options
    public const SQL_MODE_NO_TABLE_OPTIONS = 4096;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_unsigned_subtraction
    public const SQL_MODE_NO_UNSIGNED_SUBTRACTION = 8192;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_zero_date
    public const SQL_MODE_NO_ZERO_DATE = 16384;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_zero_in_date
    public const SQL_MODE_NO_ZERO_IN_DATE = 32768;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_only_full_group_by
    public const SQL_MODE_ONLY_FULL_GROUP_BY = 65536;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_pipes_as_concat
    public const SQL_MODE_PIPES_AS_CONCAT = 131072;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_real_as_float
    public const SQL_MODE_REAL_AS_FLOAT = 262144;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_strict_all_tables
    public const SQL_MODE_STRICT_ALL_TABLES = 524288;

    // https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_strict_trans_tables
    public const SQL_MODE_STRICT_TRANS_TABLES = 1048576;

    // Custom modes.

    // The table and column names and any other field that must be escaped will
    // not be.
    // Reserved keywords are being escaped regardless this mode is used or not.
    public const SQL_MODE_NO_ENCLOSING_QUOTES = 1073741824;

    /*
     * Combination SQL Modes
     * https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sql-mode-combo
     */

    // REAL_AS_FLOAT, PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE
    public const SQL_MODE_ANSI = 393234;

    // PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
    // NO_TABLE_OPTIONS, NO_FIELD_OPTIONS,
    public const SQL_MODE_DB2 = 138258;

    // PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
    // NO_TABLE_OPTIONS, NO_FIELD_OPTIONS, NO_AUTO_CREATE_USER
    public const SQL_MODE_MAXDB = 138290;

    // PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
    // NO_TABLE_OPTIONS, NO_FIELD_OPTIONS
    public const SQL_MODE_MSSQL = 138258;

    // PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
    // NO_TABLE_OPTIONS, NO_FIELD_OPTIONS, NO_AUTO_CREATE_USER
    public const SQL_MODE_ORACLE = 138290;

    // PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
    // NO_TABLE_OPTIONS, NO_FIELD_OPTIONS
    public const SQL_MODE_POSTGRESQL = 138258;

    // STRICT_TRANS_TABLES, STRICT_ALL_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE,
    // ERROR_FOR_DIVISION_BY_ZERO, NO_AUTO_CREATE_USER
    public const SQL_MODE_TRADITIONAL = 1622052;

    // -------------------------------------------------------------------------
    // Keyword.

    /**
     * Checks if the given string is a keyword.
     *
     * @param string $str        string to be checked
     * @param bool   $isReserved checks if the keyword is reserved
     *
     * @return int|null
     */
    public static function isKeyword($str, $isReserved = false)
    {
        $str = strtoupper($str);

        if (isset(static::$KEYWORDS[$str])) {
            if ($isReserved && ! (static::$KEYWORDS[$str] & Token::FLAG_KEYWORD_RESERVED)) {
                return null;
            }

            return static::$KEYWORDS[$str];
        }

        return null;
    }

    // -------------------------------------------------------------------------
    // Operator.

    /**
     * Checks if the given string is an operator.
     *
     * @param string $str string to be checked
     *
     * @return int|null the appropriate flag for the operator
     */
    public static function isOperator($str)
    {
        if (! isset(static::$OPERATORS[$str])) {
            return null;
        }

        return static::$OPERATORS[$str];
    }

    // -------------------------------------------------------------------------
    // Whitespace.

    /**
     * Checks if the given character is a whitespace.
     *
     * @param string $str string to be checked
     *
     * @return bool
     */
    public static function isWhitespace($str)
    {
        return ($str === ' ') || ($str === "\r") || ($str === "\n") || ($str === "\t");
    }

    // -------------------------------------------------------------------------
    // Comment.

    /**
     * Checks if the given string is the beginning of a whitespace.
     *
     * @param string $str string to be checked
     * @param mixed  $end
     *
     * @return int|null the appropriate flag for the comment type
     */
    public static function isComment($str, $end = false)
    {
        $len = strlen($str);
        if ($len === 0) {
            return null;
        }

        // If comment is Bash style (#):
        if ($str[0] === '#') {
            return Token::FLAG_COMMENT_BASH;
        }

        // If comment is opening C style (/*), warning, it could be a MySQL command (/*!)
        if (($len > 1) && ($str[0] === '/') && ($str[1] === '*')) {
            return ($len > 2) && ($str[2] === '!') ?
                Token::FLAG_COMMENT_MYSQL_CMD : Token::FLAG_COMMENT_C;
        }

        // If comment is closing C style (*/), warning, it could conflicts with wildcard and a real opening C style.
        // It would looks like the following valid SQL statement: "SELECT */* comment */ FROM...".
        if (($len > 1) && ($str[0] === '*') && ($str[1] === '/')) {
            return Token::FLAG_COMMENT_C;
        }

        // If comment is SQL style (--\s?):
        if (($len > 2) && ($str[0] === '-') && ($str[1] === '-') && static::isWhitespace($str[2])) {
            return Token::FLAG_COMMENT_SQL;
        }

        if (($len === 2) && $end && ($str[0] === '-') && ($str[1] === '-')) {
            return Token::FLAG_COMMENT_SQL;
        }

        return null;
    }

    // -------------------------------------------------------------------------
    // Bool.

    /**
     * Checks if the given string is a boolean value.
     * This actually check only for `TRUE` and `FALSE` because `1` or `0` are
     * actually numbers and are parsed by specific methods.
     *
     * @param string $str string to be checked
     *
     * @return bool
     */
    public static function isBool($str)
    {
        $str = strtoupper($str);

        return ($str === 'TRUE') || ($str === 'FALSE');
    }

    // -------------------------------------------------------------------------
    // Number.

    /**
     * Checks if the given character can be a part of a number.
     *
     * @param string $str string to be checked
     *
     * @return bool
     */
    public static function isNumber($str)
    {
        return ($str >= '0') && ($str <= '9') || ($str === '.')
            || ($str === '-') || ($str === '+') || ($str === 'e') || ($str === 'E');
    }

    // -------------------------------------------------------------------------
    // Symbol.

    /**
     * Checks if the given character is the beginning of a symbol. A symbol
     * can be either a variable or a field name.
     *
     * @param string $str string to be checked
     *
     * @return int|null the appropriate flag for the symbol type
     */
    public static function isSymbol($str)
    {
        if (strlen($str) === 0) {
            return null;
        }

        if ($str[0] === '@') {
            return Token::FLAG_SYMBOL_VARIABLE;
        }

        if ($str[0] === '`') {
            return Token::FLAG_SYMBOL_BACKTICK;
        }

        if ($str[0] === ':' || $str[0] === '?') {
            return Token::FLAG_SYMBOL_PARAMETER;
        }

        return null;
    }

    // -------------------------------------------------------------------------
    // String.

    /**
     * Checks if the given character is the beginning of a string.
     *
     * @param string $str string to be checked
     *
     * @return int|null the appropriate flag for the string type
     */
    public static function isString($str)
    {
        if (strlen($str) === 0) {
            return null;
        }

        if ($str[0] === '\'') {
            return Token::FLAG_STRING_SINGLE_QUOTES;
        }

        if ($str[0] === '"') {
            return Token::FLAG_STRING_DOUBLE_QUOTES;
        }

        return null;
    }

    // -------------------------------------------------------------------------
    // Delimiter.

    /**
     * Checks if the given character can be a separator for two lexeme.
     *
     * @param string $str string to be checked
     *
     * @return bool
     */
    public static function isSeparator($str)
    {
        // NOTES:   Only non alphanumeric ASCII characters may be separators.
        //          `~` is the last printable ASCII character.
        return ($str <= '~')
            && ($str !== '_')
            && ($str !== '$')
            && (($str < '0') || ($str > '9'))
            && (($str < 'a') || ($str > 'z'))
            && (($str < 'A') || ($str > 'Z'));
    }

    /**
     * Loads the specified context.
     *
     * Contexts may be used by accessing the context directly.
     *
     * @param string $context name of the context or full class name that
     *                        defines the context
     *
     * @throws LoaderException if the specified context doesn't exist.
     */
    public static function load($context = '')
    {
        if (empty($context)) {
            $context = self::$defaultContext;
        }

        if ($context[0] !== '\\') {
            // Short context name (must be formatted into class name).
            $context = self::$contextPrefix . $context;
        }

        if (! class_exists($context)) {
            throw @new LoaderException('Specified context ("' . $context . '") does not exist.', $context);
        }

        self::$loadedContext = $context;
        self::$KEYWORDS = $context::$KEYWORDS;

    }

    /**
     * Loads the context with the closest version to the one specified.
     *
     * The closest context is found by replacing last digits with zero until one
     * is loaded successfully.
     *
     * @see Context::load()
     *
     * @param string $context name of the context or full class name that
     *                        defines the context
     *
     * @return string|null The loaded context. `null` if no context was loaded.
     */
    public static function loadClosest($context = '')
    {
        $length = strlen($context);
        for ($i = $length; $i > 0;) {
            try {
                /* Trying to load the new context */
                static::load($context);

                return $context;
            } catch (LoaderException $e) {
                /* Replace last two non zero digits by zeroes */
                do {
                    $i -= 2;
                    $part = substr($context, $i, 2);
                    /* No more numeric parts to strip */
                    if (! is_numeric($part)) {
                        break 2;
                    }
                } while (intval($part) === 0 && $i > 0);

                $context = substr($context, 0, $i) . '00' . substr($context, $i + 2);
            }
        }

        /* Fallback to loading at least matching engine */
        if (strncmp($context, 'MariaDb', 7) === 0) {
            return static::loadClosest('MariaDb100300');
        }

        if (strncmp($context, 'MySql', 5) === 0) {
            return static::loadClosest('MySql50700');
        }

        return null;
    }

    /**
     * Sets the SQL mode.
     *
     * @param string $mode The list of modes. If empty, the mode is reset.
     */
    public static function setMode($mode = '')
    {
        static::$MODE = 0;
        if (empty($mode)) {
            return;
        }

        $mode = explode(',', $mode);
        foreach ($mode as $m) {
            static::$MODE |= constant('static::SQL_MODE_' . $m);
        }
    }

    /**
     * Escapes the symbol by adding surrounding backticks.
     *
     * @param array|string $str   the string to be escaped
     * @param string       $quote quote to be used when escaping
     *
     * @return string|array
     */
    public static function escape($str, $quote = '`')
    {
        if (is_array($str)) {
            foreach ($str as $key => $value) {
                $str[$key] = static::escape($value);
            }

            return $str;
        }

        if ((static::$MODE & self::SQL_MODE_NO_ENCLOSING_QUOTES) && (! static::isKeyword($str, true))) {
0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
            return $str;
        }

        if (static::$MODE & self::SQL_MODE_ANSI_QUOTES) {
            $quote = '"';
        }

        return $quote . str_replace($quote, $quote . $quote, $str) . $quote;
    }

    /**
     * Returns char used to quote identifiers based on currently set SQL Mode (ie. standard or ANSI_QUOTES)
     *
     * @return string either " (double quote, ansi_quotes mode) or ` (backtick, standard mode)
     */
    public static function getIdentifierQuote()
    {
        return self::hasMode(self::SQL_MODE_ANSI_QUOTES) ? '"' : '`';
    }

    /**
     * Function verifies that given SQL Mode constant is currently set
     *
     * @param int $flag for example Context::SQL_MODE_ANSI_QUOTES
     *
     * @return bool false on empty param, true/false on given constant/int value
     */
    public static function hasMode($flag = null)
    {
        if (empty($flag)) {
            return false;
        }

        return (self::$MODE & $flag) === $flag;
    }
}

// Initializing the default context.
Context::load();


1		<?php
2		/**
3		* Defines a context class that is later extended to define other contexts.
4		*
5		* A context is a collection of keywords, operators and functions used for
6		* parsing.
7		*/
8
9		declare(strict_types=1);
10
11		namespace PhpMyAdmin\SqlParser;
12
13		use PhpMyAdmin\SqlParser\Exceptions\LoaderException;
14
15		use function class_exists;
16		use function constant;
17		use function explode;
18		use function intval;
19		use function is_array;
20		use function is_numeric;
21		use function str_replace;
22		use function strlen;
23		use function strncmp;
24		use function strtoupper;
25		use function substr;
26
27		/**
28		* Holds the configuration of the context that is currently used.
29		*/
30		abstract class Context
31		{
32		/**
33		* The maximum length of a keyword.
34		*
35		* @see static::$TOKEN_KEYWORD
36		*/
37		public const KEYWORD_MAX_LENGTH = 30;
38
39		/**
40		* The maximum length of a label.
41		*
42		* @see static::$TOKEN_LABEL
43		* Ref: https://dev.mysql.com/doc/refman/5.7/en/statement-labels.html
44		*/
45		public const LABEL_MAX_LENGTH = 16;
46
47		/**
48		* The maximum length of an operator.
49		*
50		* @see static::$TOKEN_OPERATOR
51		*/
52		public const OPERATOR_MAX_LENGTH = 4;
53
54		/**
55		* The name of the default content.
56		*
57		* @var string
58		*/
59		public static $defaultContext = '\\PhpMyAdmin\\SqlParser\\Contexts\\ContextMySql50700';
60
61		/**
62		* The name of the loaded context.
63		*
64		* @var string
65		*/
66		public static $loadedContext = '\\PhpMyAdmin\\SqlParser\\Contexts\\ContextMySql50700';
67
68		/**
69		* The prefix concatenated to the context name when an incomplete class name
70		* is specified.
71		*
72		* @var string
73		*/
74		public static $contextPrefix = '\\PhpMyAdmin\\SqlParser\\Contexts\\Context';
75
76		/**
77		* List of keywords.
78		*
79		* Because, PHP's associative arrays are basically hash tables, it is more
80		* efficient to store keywords as keys instead of values.
81		*
82		* The value associated to each keyword represents its flags.
83		*
84		* @see Token::FLAG_KEYWORD_RESERVED Token::FLAG_KEYWORD_COMPOSED
85		* Token::FLAG_KEYWORD_DATA_TYPE Token::FLAG_KEYWORD_KEY
86		* Token::FLAG_KEYWORD_FUNCTION
87		*
88		* Elements are sorted by flags, length and keyword.
89		*
90		* @var array
91		*/
92		public static $KEYWORDS = [];
93
94		/**
95		* List of operators and their flags.
96		*
97		* @var array
98		*/
99		public static $OPERATORS = [
100		// Some operators (*, =) may have ambiguous flags, because they depend on
101		// the context they are being used in.
102		// For example: 1. SELECT * FROM table; # SQL specific (wildcard)
103		// SELECT 2 * 3; # arithmetic
104		// 2. SELECT * FROM table WHERE foo = 'bar';
105		// SET @i = 0;
106
107		// @see Token::FLAG_OPERATOR_ARITHMETIC
108		'%' => 1,
109		'*' => 1,
110		'+' => 1,
111		'-' => 1,
112		'/' => 1,
113
114		// @see Token::FLAG_OPERATOR_LOGICAL
115		'!' => 2,
116		'!=' => 2,
117		'&&' => 2,
118		'<' => 2,
119		'<=' => 2,
120		'<=>' => 2,
121		'<>' => 2,
122		'=' => 2,
123		'>' => 2,
124		'>=' => 2,
125		'\|\|' => 2,
126
127		// @see Token::FLAG_OPERATOR_BITWISE
128		'&' => 4,
129		'<<' => 4,
130		'>>' => 4,
131		'^' => 4,
132		'\|' => 4,
133		'~' => 4,
134
135		// @see Token::FLAG_OPERATOR_ASSIGNMENT
136		':=' => 8,
137
138		// @see Token::FLAG_OPERATOR_SQL
139		'(' => 16,
140		')' => 16,
141		'.' => 16,
142		',' => 16,
143		';' => 16,
144		];
145
146		/**
147		* The mode of the MySQL server that will be used in lexing, parsing and
148		* building the statements.
149		*
150		* @var int
151		*/
152		public static $MODE = 0;
153
154		/*
155		* Server SQL Modes
156		* https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html
157		*/
158
159		// Compatibility mode for Microsoft's SQL server.
160		// This is the equivalent of ANSI_QUOTES.
161		public const SQL_MODE_COMPAT_MYSQL = 2;
162
163		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_allow_invalid_dates
164		public const SQL_MODE_ALLOW_INVALID_DATES = 1;
165
166		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_ansi_quotes
167		public const SQL_MODE_ANSI_QUOTES = 2;
168
169		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_error_for_division_by_zero
170		public const SQL_MODE_ERROR_FOR_DIVISION_BY_ZERO = 4;
171
172		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_high_not_precedence
173		public const SQL_MODE_HIGH_NOT_PRECEDENCE = 8;
174
175		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_ignore_space
176		public const SQL_MODE_IGNORE_SPACE = 16;
177
178		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_auto_create_user
179		public const SQL_MODE_NO_AUTO_CREATE_USER = 32;
180
181		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_auto_value_on_zero
182		public const SQL_MODE_NO_AUTO_VALUE_ON_ZERO = 64;
183
184		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_backslash_escapes
185		public const SQL_MODE_NO_BACKSLASH_ESCAPES = 128;
186
187		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_dir_in_create
188		public const SQL_MODE_NO_DIR_IN_CREATE = 256;
189
190		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_dir_in_create
191		public const SQL_MODE_NO_ENGINE_SUBSTITUTION = 512;
192
193		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_field_options
194		public const SQL_MODE_NO_FIELD_OPTIONS = 1024;
195
196		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_key_options
197		public const SQL_MODE_NO_KEY_OPTIONS = 2048;
198
199		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_table_options
200		public const SQL_MODE_NO_TABLE_OPTIONS = 4096;
201
202		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_unsigned_subtraction
203		public const SQL_MODE_NO_UNSIGNED_SUBTRACTION = 8192;
204
205		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_zero_date
206		public const SQL_MODE_NO_ZERO_DATE = 16384;
207
208		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_no_zero_in_date
209		public const SQL_MODE_NO_ZERO_IN_DATE = 32768;
210
211		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_only_full_group_by
212		public const SQL_MODE_ONLY_FULL_GROUP_BY = 65536;
213
214		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_pipes_as_concat
215		public const SQL_MODE_PIPES_AS_CONCAT = 131072;
216
217		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_real_as_float
218		public const SQL_MODE_REAL_AS_FLOAT = 262144;
219
220		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_strict_all_tables
221		public const SQL_MODE_STRICT_ALL_TABLES = 524288;
222
223		// https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sqlmode_strict_trans_tables
224		public const SQL_MODE_STRICT_TRANS_TABLES = 1048576;
225
226		// Custom modes.
227
228		// The table and column names and any other field that must be escaped will
229		// not be.
230		// Reserved keywords are being escaped regardless this mode is used or not.
231		public const SQL_MODE_NO_ENCLOSING_QUOTES = 1073741824;
232
233		/*
234		* Combination SQL Modes
235		* https://dev.mysql.com/doc/refman/5.0/en/sql-mode.html#sql-mode-combo
236		*/
237
238		// REAL_AS_FLOAT, PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE
239		public const SQL_MODE_ANSI = 393234;
240
241		// PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
242		// NO_TABLE_OPTIONS, NO_FIELD_OPTIONS,
243		public const SQL_MODE_DB2 = 138258;
244
245		// PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
246		// NO_TABLE_OPTIONS, NO_FIELD_OPTIONS, NO_AUTO_CREATE_USER
247		public const SQL_MODE_MAXDB = 138290;
248
249		// PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
250		// NO_TABLE_OPTIONS, NO_FIELD_OPTIONS
251		public const SQL_MODE_MSSQL = 138258;
252
253		// PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
254		// NO_TABLE_OPTIONS, NO_FIELD_OPTIONS, NO_AUTO_CREATE_USER
255		public const SQL_MODE_ORACLE = 138290;
256
257		// PIPES_AS_CONCAT, ANSI_QUOTES, IGNORE_SPACE, NO_KEY_OPTIONS,
258		// NO_TABLE_OPTIONS, NO_FIELD_OPTIONS
259		public const SQL_MODE_POSTGRESQL = 138258;
260
261		// STRICT_TRANS_TABLES, STRICT_ALL_TABLES, NO_ZERO_IN_DATE, NO_ZERO_DATE,
262		// ERROR_FOR_DIVISION_BY_ZERO, NO_AUTO_CREATE_USER
263		public const SQL_MODE_TRADITIONAL = 1622052;
264
265		// -------------------------------------------------------------------------
266		// Keyword.
267
268		/**
269		* Checks if the given string is a keyword.
270		*
271		* @param string $str string to be checked
272		* @param bool $isReserved checks if the keyword is reserved
273		*
274		* @return int\|null
275		*/
276	1912	public static function isKeyword($str, $isReserved = false)
277		{
278	1912	$str = strtoupper($str);
279
280	1912	if (isset(static::$KEYWORDS[$str])) {
281	1856	if ($isReserved && ! (static::$KEYWORDS[$str] & Token::FLAG_KEYWORD_RESERVED)) {
282	4	return null;
283		}
284
285	1856	return static::$KEYWORDS[$str];
286		}
287
288	1912	return null;
289		}
290
291		// -------------------------------------------------------------------------
292		// Operator.
293
294		/**
295		* Checks if the given string is an operator.
296		*
297		* @param string $str string to be checked
298		*
299		* @return int\|null the appropriate flag for the operator
300		*/
301	1944	public static function isOperator($str)
302		{
303	1944	if (! isset(static::$OPERATORS[$str])) {
304	1936	return null;
305		}
306
307	1364	return static::$OPERATORS[$str];
308		}
309
310		// -------------------------------------------------------------------------
311		// Whitespace.
312
313		/**
314		* Checks if the given character is a whitespace.
315		*
316		* @param string $str string to be checked
317		*
318		* @return bool
319		*/
320	1964	public static function isWhitespace($str)
321		{
322	1964	return ($str === ' ') \|\| ($str === "\r") \|\| ($str === "\n") \|\| ($str === "\t");
323		}
324
325		// -------------------------------------------------------------------------
326		// Comment.
327
328		/**
329		* Checks if the given string is the beginning of a whitespace.
330		*
331		* @param string $str string to be checked
332		* @param mixed $end
333		*
334		* @return int\|null the appropriate flag for the comment type
335		*/
336	1944	public static function isComment($str, $end = false)
337		{
338	1944	$len = strlen($str);
339	1944	if ($len === 0) {
340	4	return null;
341		}
342
343		// If comment is Bash style (#):
344	1944	if ($str[0] === '#') {
345	16	return Token::FLAG_COMMENT_BASH;
346		}
347
348		// If comment is opening C style (/), warning, it could be a MySQL command (/!)
349	1944	if (($len > 1) && ($str[0] === '/') && ($str[1] === '*')) {
350	128	return ($len > 2) && ($str[2] === '!') ?
351	128	Token::FLAG_COMMENT_MYSQL_CMD : Token::FLAG_COMMENT_C;
352		}
353
354		// If comment is closing C style (*/), warning, it could conflicts with wildcard and a real opening C style.
355		// It would looks like the following valid SQL statement: "SELECT / comment */ FROM...".
356	1944	if (($len > 1) && ($str[0] === '*') && ($str[1] === '/')) {
357	16	return Token::FLAG_COMMENT_C;
358		}
359
360		// If comment is SQL style (--\s?):
361	1944	if (($len > 2) && ($str[0] === '-') && ($str[1] === '-') && static::isWhitespace($str[2])) {
362	80	return Token::FLAG_COMMENT_SQL;
363		}
364
365	1944	if (($len === 2) && $end && ($str[0] === '-') && ($str[1] === '-')) {
366	4	return Token::FLAG_COMMENT_SQL;
367		}
368
369	1944	return null;
370		}
371
372		// -------------------------------------------------------------------------
373		// Bool.
374
375		/**
376		* Checks if the given string is a boolean value.
377		* This actually check only for `TRUE` and `FALSE` because `1` or `0` are
378		* actually numbers and are parsed by specific methods.
379		*
380		* @param string $str string to be checked
381		*
382		* @return bool
383		*/
384	1912	public static function isBool($str)
385		{
386	1912	$str = strtoupper($str);
387
388	1912	return ($str === 'TRUE') \|\| ($str === 'FALSE');
389		}
390
391		// -------------------------------------------------------------------------
392		// Number.
393
394		/**
395		* Checks if the given character can be a part of a number.
396		*
397		* @param string $str string to be checked
398		*
399		* @return bool
400		*/
401	4	public static function isNumber($str)
402		{
403	4	return ($str >= '0') && ($str <= '9') \|\| ($str === '.')
404	4	\|\| ($str === '-') \|\| ($str === '+') \|\| ($str === 'e') \|\| ($str === 'E');
405		}
406
407		// -------------------------------------------------------------------------
408		// Symbol.
409
410		/**
411		* Checks if the given character is the beginning of a symbol. A symbol
412		* can be either a variable or a field name.
413		*
414		* @param string $str string to be checked
415		*
416		* @return int\|null the appropriate flag for the symbol type
417		*/
418	1912	public static function isSymbol($str)
419		{
420	1912	if (strlen($str) === 0) {
421	4	return null;
422		}
423
424	1912	if ($str[0] === '@') {
425	132	return Token::FLAG_SYMBOL_VARIABLE;
426		}
427
428	1908	if ($str[0] === '`') {
429	456	return Token::FLAG_SYMBOL_BACKTICK;
430		}
431
432	1908	if ($str[0] === ':' \|\| $str[0] === '?') {
433	12	return Token::FLAG_SYMBOL_PARAMETER;
434		}
435
436	1908	return null;
437		}
438
439		// -------------------------------------------------------------------------
440		// String.
441
442		/**
443		* Checks if the given character is the beginning of a string.
444		*
445		* @param string $str string to be checked
446		*
447		* @return int\|null the appropriate flag for the string type
448		*/
449	1912	public static function isString($str)
450		{
451	1912	if (strlen($str) === 0) {
452	4	return null;
453		}
454
455	1912	if ($str[0] === '\'') {
456	372	return Token::FLAG_STRING_SINGLE_QUOTES;
457		}
458
459	1912	if ($str[0] === '"') {
460	260	return Token::FLAG_STRING_DOUBLE_QUOTES;
461		}
462
463	1912	return null;
464		}
465
466		// -------------------------------------------------------------------------
467		// Delimiter.
468
469		/**
470		* Checks if the given character can be a separator for two lexeme.
471		*
472		* @param string $str string to be checked
473		*
474		* @return bool
475		*/
476	1912	public static function isSeparator($str)
477		{
478		// NOTES: Only non alphanumeric ASCII characters may be separators.
479		// `~` is the last printable ASCII character.
480	1912	return ($str <= '~')
481	1912	&& ($str !== '_')
482	1912	&& ($str !== '$')
483	1912	&& (($str < '0') \|\| ($str > '9'))
484	1912	&& (($str < 'a') \|\| ($str > 'z'))
485	1912	&& (($str < 'A') \|\| ($str > 'Z'));
486		}
487
488		/**
489		* Loads the specified context.
490		*
491		* Contexts may be used by accessing the context directly.
492		*
493		* @param string $context name of the context or full class name that
494		* defines the context
495		*
496		* @throws LoaderException if the specified context doesn't exist.
497		*/
498	87	public static function load($context = '')
499		{
500	87	if (empty($context)) {
501	75	$context = self::$defaultContext;
502		}
503
504	87	if ($context[0] !== '\\') {
505		// Short context name (must be formatted into class name).
506	80	$context = self::$contextPrefix . $context;
507		}
508
509	87	if (! class_exists($context)) {
510	24	throw @new LoaderException('Specified context ("' . $context . '") does not exist.', $context);
511		}
512
513	83	self::$loadedContext = $context;
514	83	self::$KEYWORDS = $context::$KEYWORDS;
		0 ignored issues – show Bug introduced 2020-08-16 13:42 UTC by Report Bug Copy Issue Report The property `KEYWORDS` does not exist on `string`. Loading history...
515	83	}
516
517		/**
518		* Loads the context with the closest version to the one specified.
519		*
520		* The closest context is found by replacing last digits with zero until one
521		* is loaded successfully.
522		*
523		* @see Context::load()
524		*
525		* @param string $context name of the context or full class name that
526		* defines the context
527		*
528		* @return string\|null The loaded context. `null` if no context was loaded.
529		*/
530	28	public static function loadClosest($context = '')
531		{
532	28	$length = strlen($context);
533	28	for ($i = $length; $i > 0;) {
534		try {
535		/* Trying to load the new context */
536	28	static::load($context);
537
538	24	return $context;
539	20	} catch (LoaderException $e) {
540		/* Replace last two non zero digits by zeroes */
541		do {
542	20	$i -= 2;
543	20	$part = substr($context, $i, 2);
544		/* No more numeric parts to strip */
545	20	if (! is_numeric($part)) {
546	12	break 2;
547		}
548	16	} while (intval($part) === 0 && $i > 0);
549
550	16	$context = substr($context, 0, $i) . '00' . substr($context, $i + 2);
551		}
552		}
553
554		/* Fallback to loading at least matching engine */
555	12	if (strncmp($context, 'MariaDb', 7) === 0) {
556	4	return static::loadClosest('MariaDb100300');
557		}
558
559	8	if (strncmp($context, 'MySql', 5) === 0) {
560	4	return static::loadClosest('MySql50700');
561		}
562
563	4	return null;
564		}
565
566		/**
567		* Sets the SQL mode.
568		*
569		* @param string $mode The list of modes. If empty, the mode is reset.
570		*/
571	1060	public static function setMode($mode = '')
572		{
573	1060	static::$MODE = 0;
574	1060	if (empty($mode)) {
575	1060	return;
576		}
577
578	8	$mode = explode(',', $mode);
579	8	foreach ($mode as $m) {
580	8	static::$MODE \|= constant('static::SQL_MODE_' . $m);
581		}
582	8	}
583
584		/**
585		* Escapes the symbol by adding surrounding backticks.
586		*
587		* @param array\|string $str the string to be escaped
588		* @param string $quote quote to be used when escaping
589		*
590		* @return string\|array
591		*/
592	176	public static function escape($str, $quote = '`')
593		{
594	176	if (is_array($str)) {
595	60	foreach ($str as $key => $value) {
596	60	$str[$key] = static::escape($value);
597		}
598
599	60	return $str;
600		}
601
602	176	if ((static::$MODE & self::SQL_MODE_NO_ENCLOSING_QUOTES) && (! static::isKeyword($str, true))) {
		0 ignored issues – show Bug Best Practice introduced 2020-08-16 13:42 UTC by Report Bug Copy Issue Report The expression `static::isKeyword($str, true)` of type `integer\|null` is loosely compared to `false`; this is ambiguous if the integer can be 0. You might want to explicitly use `=== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `integer` values, zero is a special case, in particular the following results might be unexpected: 0 == false // true 0 == null // true 123 == false // false 123 == null // false // It is often better to use strict comparison 0 === false // false 0 === null // false Loading history...
603	4	return $str;
604		}
605
606	176	if (static::$MODE & self::SQL_MODE_ANSI_QUOTES) {
607	4	$quote = '"';
608		}
609
610	176	return $quote . str_replace($quote, $quote . $quote, $str) . $quote;
611		}
612
613		/**
614		* Returns char used to quote identifiers based on currently set SQL Mode (ie. standard or ANSI_QUOTES)
615		*
616		* @return string either " (double quote, ansi_quotes mode) or ` (backtick, standard mode)
617		*/
618		public static function getIdentifierQuote()
619		{
620		return self::hasMode(self::SQL_MODE_ANSI_QUOTES) ? '"' : '`';
621		}
622
623		/**
624		* Function verifies that given SQL Mode constant is currently set
625		*
626		* @param int $flag for example Context::SQL_MODE_ANSI_QUOTES
627		*
628		* @return bool false on empty param, true/false on given constant/int value
629		*/
630		public static function hasMode($flag = null)
631		{
632		if (empty($flag)) {
633		return false;
634		}
635
636		return (self::$MODE & $flag) === $flag;
637		}
638		}
639
640		// Initializing the default context.
641		Context::load();
642

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