Token::setQuoteNames() - Code Metrics - Inspection of "Merge pull request #65 from graze/utf8mb3" - graze/morphism - Measure and Improve Code Quality continuously with Scrutinizer

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created 2024-04-17 15:38 UTC

Token::setQuoteNames() A

↳ Parent: Token

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	1

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	1
eloc	1
nc	1
nop	1
dl	0
loc	3
rs	10
c	1
b	0
f	0
ccs	2
cts	2
cp	1
crap	1

<?php
namespace Graze\Morphism\Parse;

use RuntimeException;

/**
 * Represents a lexical token parsed from an SQL input stream.
 */
class Token
{
    const SYMBOL = 'symbol';
    const IDENTIFIER = 'identifier';
    const STRING = 'string';
    const NUMBER = 'number';
    const BIN = 'bin';
    const HEX = 'hex';
    const WHITESPACE = 'whitespace';
    const COMMENT = 'comment';
    const CONDITIONAL_START = 'conditional-start';
    const CONDITIONAL_END = 'conditional-end';
    const EOF = 'EOF';

    /**
     * @var string  'symbol' | 'identifier' | 'string' | 'number' | 'bin' |
     *              'hex' | 'whitespace' | 'comment' | 'conditional-start' |
     *              'conditional-end' | 'EOF'
     */
    public $type;

    /**
     * @var string  the textual content of the token
     */
    public $text;

    /** @var bool */
    private static $quoteNames = false;

    /**
     * Constructor
     *
     * @param string $type
     * @param string $text
     */
    public function __construct($type, $text = '')
    {
        $this->type = $type;
        $this->text = (string) $text;
    }

    /**
     * Controls the behaviour of escapeIdentifier().
     *
     * If $quoteNames is true, future calls to escapeIdentifier will use
     * backquotes to delimit all identifiers. If false, no quoting will take
     * place.
     *
     * @param bool $quoteNames  whether to quote identifiers
     */
    public static function setQuoteNames($quoteNames)
    {
        self::$quoteNames = !!$quoteNames;
    }

    /**
     * Returns the current state of behaviour for escapeIdentifier().
     * True indicate that identifiers will be delimited with backquotes;
     * false indicates that no quoting will take place.
     *
     * @return bool
     */
    public static function getQuoteNames()
    {
        return self::$quoteNames;
    }

    /**
     * Returns a string representation suitable for debug output.
     * e.g. 'identifier[pr_name]'
     *
     * @return string
     */
    public function toDebugString()
    {
        return "{$this->type}[{$this->text}]";
    }

    /**
     * Returns true if this token represents end-of-file.
     *
     * @return bool
     */
    public function isEof()
    {
        return $this->type === self::EOF;
    }

    /**
     * Returns true if the token has the specified type and text content
     * (case insensitive).
     *
     * @param  string $type e.g. 'symbol' | 'identifier' | ...
     * @param  string $text content of token
     * @return bool
     */
    public function eq($type, $text)
    {
        return ($this->type === $type)
            && strcasecmp($this->text, $text) === 0;
    }

    /**
     * Creates a string token by parsing the given string.
     * The supplied string should exclude the quote delimiters.
     *
     * @param  string $string    string to parse
     * @param  string $quoteChar character that was used as the quote delimiter
     * @return Token
     */
    public static function fromString($string, $quoteChar)
    {
        $text = '';
        $n = strlen($string);
        for ($i = 0; $i < $n; ++$i) {
            $ch = $string[$i];
            if ($ch === $quoteChar) {
                ++$i;
            }
            if ($ch === '\\') {
                ++$i;
                $ch = $string[$i];
                switch ($ch) {
                    case '0':
                        $ch = chr(0);
                        break;
                    case 'b':
                        $ch = chr(8);
                        break;
                    case 'n':
                        $ch = chr(10);
                        break;
                    case 'r':
                        $ch = chr(13);
                        break;
                    case 't':
                        $ch = chr(9);
                        break;
                    case 'z':
                        $ch = chr(26);
                        break;
                }
            }
            $text .= $ch;
        }
        return new self(self::STRING, $text);
    }

    /**
     * Creates an identifier token by parsing the given string.
     * The supplied string should exclude any backquote delimiters.
     *
     * @param  string $string string to parse
     * @return Token
     */
    public static function fromIdentifier($string)
    {
        return new self('identifier', str_replace('``', '`', $string));
    }

    /**
     * Returns a quote delimited, escaped string suitable for use in SQL.
     * If $string is null, returns `NULL`.
     *
     * @param  string|null $value - value to convert
     * @return string
     */
    public static function escapeString($value)
    {
        if (is_null($value)) {
            return 'NULL';
        }
        $value = strtr(
            $value,
            [
            "'"     => "''",
            chr(0)  => "\\0",
            chr(10) => "\\n",
            chr(13) => "\\r",
            "\\"    => "\\\\",
            ]
        );
        return "'$value'";
    }

    /**
     * Returns an identifier suitable for use as in SQL.
     *
     * If setQuoteNames(true) has previously been called, the identifier
     * will be delimited with backquotes, otherwise no delimiters will be
     * added.
     *
     * @param  string $string text to use as the identifier name
     * @return string
     */
    public static function escapeIdentifier($string)
    {
        if (!self::$quoteNames) {
            return $string;
        }
        $string = strtr($string, [ "`" => "``" ]);
        return "`" . $string . "`";
    }

    /**
     * Returns the string represented by the token.
     *
     * Tokens of type 'string' or 'number' will simply return the parsed text,
     * whereas 'hex' or 'bin' tokens will be reinterpreted as strings. E.g.
     * a 'hex' token generated from the sequence x'41424344' in the token
     * stream will be returned as 'ABCD'.
     *
     * An exception will be thrown for any other token type.
     *
     * @throws RuntimeException
     * @return string
     */
    public function asString()
    {
        switch ($this->type) {
            case self::STRING:
                return $this->text;

            case self::NUMBER:
                preg_match('/^([+-]?)0*(.*)$/', $this->text, $pregMatch);
                list(, $sign, $value) = $pregMatch;
                if ($value == '') {
                    $value = '0';
                } elseif ($value[0] == '.') {
                    $value = '0' . $value;
                }
                if ($sign == '-') {
                    $value = $sign . $value;
                }
                return $value;

            case self::HEX:
                return pack('H*', $this->text);

            case self::BIN:
                $bytes = '';
                for ($text = $this->text; $text !== ''; $text = substr($text, 0, -8)) {
                    $bytes = chr(/** @scrutinizer ignore-type */ bindec(substr($text, -8))) . $bytes;
                }
                return $bytes;

            default:
                throw new RuntimeException("Expected string");
        }
    }

    /**
     * Return the token as a number.
     *
     * @return int|number
     */
    public function asNumber()
    {
        switch ($this->type) {
            case self::NUMBER:
                return 1 * $this->text;

            case self::STRING:
                if (is_numeric($this->text)) {
                    return 1 * $this->text;
                } else {
                    throw new RuntimeException("Not a valid number: {$this->text}");
                }

            case self::HEX:
                return hexdec($this->text);

            case self::BIN:
                return bindec($this->text);

            default:
                throw new RuntimeException("Expected a number");
        }
    }

    /**
     * Return the token value as a date string.
     *
     * @return string
     */
    public function asDate()
    {
        $text = $this->text;
        if ($text === '0') {
            return '0000-00-00';
        }
        // MySQL actually recognises a bunch of other date formats,
        // but YYYY-MM-DD is the only one we're prepared to accept.
        if (preg_match('/^\d{4}-\d{2}-\d{2}$/', $text, $pregMatch)) {
            return $text;
        } else {
            throw new RuntimeException("Expected a date");
        }
    }

    /**
     * Return the token as a timestamp string.
     *
     * @return string
     */
    public function asTime()
    {
        $text = $this->text;
        if ($text === '0') {
            return '00:00:00';
        }
        // MySQL actually recognises a bunch of other time formats,
        // but HH:MM:SS is the only one we're prepared to accept.
        if (preg_match('/^\d{2}:\d{2}:\d{2}$/', $text)) {
            return $text;
        } else {
            throw new RuntimeException("Expected a time");
        }
    }

    /**
     * Return the token as a date and time string.
     *
     * @return string
     */
    public function asDateTime()
    {
        $text = $this->text;
        if ($text === '0') {
            return '0000-00-00 00:00:00';
        }
        // MySQL actually recognises a bunch of other datetime formats,
        // but YYYY-MM-DD and YYYY-MM-DD HH:MM:SS are the only ones we're
        // prepared to accept.
        if (preg_match('/^\d{4}-\d{2}-\d{2}$/', $text)) {
            return "$text 00:00:00";
        }
        if (preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/', $text)) {
            return $text;
        }
        throw new RuntimeException("Bad datetime");
    }
}


1		<?php
2		namespace Graze\Morphism\Parse;
3
4		use RuntimeException;
5
6		/**
7		* Represents a lexical token parsed from an SQL input stream.
8		*/
9		class Token
10		{
11		const SYMBOL = 'symbol';
12		const IDENTIFIER = 'identifier';
13		const STRING = 'string';
14		const NUMBER = 'number';
15		const BIN = 'bin';
16		const HEX = 'hex';
17		const WHITESPACE = 'whitespace';
18		const COMMENT = 'comment';
19		const CONDITIONAL_START = 'conditional-start';
20		const CONDITIONAL_END = 'conditional-end';
21		const EOF = 'EOF';
22
23		/**
24		* @var string 'symbol' \| 'identifier' \| 'string' \| 'number' \| 'bin' \|
25		* 'hex' \| 'whitespace' \| 'comment' \| 'conditional-start' \|
26		* 'conditional-end' \| 'EOF'
27		*/
28		public $type;
29
30		/**
31		* @var string the textual content of the token
32		*/
33		public $text;
34
35		/** @var bool */
36		private static $quoteNames = false;
37
38		/**
39		* Constructor
40		*
41		* @param string $type
42		* @param string $text
43		*/
44	646	public function __construct($type, $text = '')
45		{
46	646	$this->type = $type;
47	646	$this->text = (string) $text;
48	646	}
49
50		/**
51		* Controls the behaviour of escapeIdentifier().
52		*
53		* If $quoteNames is true, future calls to escapeIdentifier will use
54		* backquotes to delimit all identifiers. If false, no quoting will take
55		* place.
56		*
57		* @param bool $quoteNames whether to quote identifiers
58		*/
59	732	public static function setQuoteNames($quoteNames)
60		{
61	732	self::$quoteNames = !!$quoteNames;
62	732	}
63
64		/**
65		* Returns the current state of behaviour for escapeIdentifier().
66		* True indicate that identifiers will be delimited with backquotes;
67		* false indicates that no quoting will take place.
68		*
69		* @return bool
70		*/
71	732	public static function getQuoteNames()
72		{
73	732	return self::$quoteNames;
74		}
75
76		/**
77		* Returns a string representation suitable for debug output.
78		* e.g. 'identifier[pr_name]'
79		*
80		* @return string
81		*/
82	99	public function toDebugString()
83		{
84	99	return "{$this->type}[{$this->text}]";
85		}
86
87		/**
88		* Returns true if this token represents end-of-file.
89		*
90		* @return bool
91		*/
92	25	public function isEof()
93		{
94	25	return $this->type === self::EOF;
95		}
96
97		/**
98		* Returns true if the token has the specified type and text content
99		* (case insensitive).
100		*
101		* @param string $type e.g. 'symbol' \| 'identifier' \| ...
102		* @param string $text content of token
103		* @return bool
104		*/
105	509	public function eq($type, $text)
106		{
107	509	return ($this->type === $type)
108	509	&& strcasecmp($this->text, $text) === 0;
109		}
110
111		/**
112		* Creates a string token by parsing the given string.
113		* The supplied string should exclude the quote delimiters.
114		*
115		* @param string $string string to parse
116		* @param string $quoteChar character that was used as the quote delimiter
117		* @return Token
118		*/
119	59	public static function fromString($string, $quoteChar)
120		{
121	59	$text = '';
122	59	$n = strlen($string);
123	59	for ($i = 0; $i < $n; ++$i) {
124	54	$ch = $string[$i];
125	54	if ($ch === $quoteChar) {
126	3	++$i;
127		}
128	54	if ($ch === '\\') {
129	6	++$i;
130	6	$ch = $string[$i];
131		switch ($ch) {
132	6	case '0':
133	1	$ch = chr(0);
134	1	break;
135	6	case 'b':
136	1	$ch = chr(8);
137	1	break;
138	6	case 'n':
139	1	$ch = chr(10);
140	1	break;
141	6	case 'r':
142	1	$ch = chr(13);
143	1	break;
144	6	case 't':
145	1	$ch = chr(9);
146	1	break;
147	6	case 'z':
148	1	$ch = chr(26);
149	1	break;
150		}
151		}
152	54	$text .= $ch;
153		}
154	59	return new self(self::STRING, $text);
155		}
156
157		/**
158		* Creates an identifier token by parsing the given string.
159		* The supplied string should exclude any backquote delimiters.
160		*
161		* @param string $string string to parse
162		* @return Token
163		*/
164	15	public static function fromIdentifier($string)
165		{
166	15	return new self('identifier', str_replace('``', '`', $string));
167		}
168
169		/**
170		* Returns a quote delimited, escaped string suitable for use in SQL.
171		* If $string is null, returns `NULL`.
172		*
173		* @param string\|null $value - value to convert
174		* @return string
175		*/
176	125	public static function escapeString($value)
177		{
178	125	if (is_null($value)) {
179	1	return 'NULL';
180		}
181	124	$value = strtr(
182	124	$value,
183		[
184	124	"'" => "''",
185	124	chr(0) => "\\0",
186	124	chr(10) => "\\n",
187	124	chr(13) => "\\r",
188	124	"\\" => "\\\\",
189		]
190		);
191	124	return "'$value'";
192		}
193
194		/**
195		* Returns an identifier suitable for use as in SQL.
196		*
197		* If setQuoteNames(true) has previously been called, the identifier
198		* will be delimited with backquotes, otherwise no delimiters will be
199		* added.
200		*
201		* @param string $string text to use as the identifier name
202		* @return string
203		*/
204	303	public static function escapeIdentifier($string)
205		{
206	303	if (!self::$quoteNames) {
207	4	return $string;
208		}
209	299	$string = strtr($string, [ "`" => "``" ]);
210	299	return "`" . $string . "`";
211		}
212
213		/**
214		* Returns the string represented by the token.
215		*
216		* Tokens of type 'string' or 'number' will simply return the parsed text,
217		* whereas 'hex' or 'bin' tokens will be reinterpreted as strings. E.g.
218		* a 'hex' token generated from the sequence x'41424344' in the token
219		* stream will be returned as 'ABCD'.
220		*
221		* An exception will be thrown for any other token type.
222		*
223		* @throws RuntimeException
224		* @return string
225		*/
226	20	public function asString()
227		{
228	20	switch ($this->type) {
229	20	case self::STRING:
230	4	return $this->text;
231
232	16	case self::NUMBER:
233	9	preg_match('/^([+-]?)0(.)$/', $this->text, $pregMatch);
234	9	list(, $sign, $value) = $pregMatch;
235	9	if ($value == '') {
236	1	$value = '0';
237	8	} elseif ($value[0] == '.') {
238	1	$value = '0' . $value;
239		}
240	9	if ($sign == '-') {
241	2	$value = $sign . $value;
242		}
243	9	return $value;
244
245	7	case self::HEX:
246	4	return pack('H*', $this->text);
247
248	3	case self::BIN:
249	2	$bytes = '';
250	2	for ($text = $this->text; $text !== ''; $text = substr($text, 0, -8)) {
251	2	$bytes = chr(/** @scrutinizer ignore-type */ bindec(substr($text, -8))) . $bytes;
252		}
253	2	return $bytes;
254
255		default:
256	1	throw new RuntimeException("Expected string");
257		}
258		}
259
260		/**
261		* Return the token as a number.
262		*
263		* @return int\|number
264		*/
265	25	public function asNumber()
266		{
267	25	switch ($this->type) {
268	25	case self::NUMBER:
269	17	return 1 * $this->text;
270
271	8	case self::STRING:
272	3	if (is_numeric($this->text)) {
273	2	return 1 * $this->text;
274		} else {
275	1	throw new RuntimeException("Not a valid number: {$this->text}");
276		}
277
278	5	case self::HEX:
279	2	return hexdec($this->text);
280
281	3	case self::BIN:
282	2	return bindec($this->text);
283
284		default:
285	1	throw new RuntimeException("Expected a number");
286		}
287		}
288
289		/**
290		* Return the token value as a date string.
291		*
292		* @return string
293		*/
294	10	public function asDate()
295		{
296	10	$text = $this->text;
297	10	if ($text === '0') {
298	2	return '0000-00-00';
299		}
300		// MySQL actually recognises a bunch of other date formats,
301		// but YYYY-MM-DD is the only one we're prepared to accept.
302	8	if (preg_match('/^\d{4}-\d{2}-\d{2}$/', $text, $pregMatch)) {
303	4	return $text;
304		} else {
305	4	throw new RuntimeException("Expected a date");
306		}
307		}
308
309		/**
310		* Return the token as a timestamp string.
311		*
312		* @return string
313		*/
314	9	public function asTime()
315		{
316	9	$text = $this->text;
317	9	if ($text === '0') {
318	2	return '00:00:00';
319		}
320		// MySQL actually recognises a bunch of other time formats,
321		// but HH:MM:SS is the only one we're prepared to accept.
322	7	if (preg_match('/^\d{2}:\d{2}:\d{2}$/', $text)) {
323	3	return $text;
324		} else {
325	4	throw new RuntimeException("Expected a time");
326		}
327		}
328
329		/**
330		* Return the token as a date and time string.
331		*
332		* @return string
333		*/
334	17	public function asDateTime()
335		{
336	17	$text = $this->text;
337	17	if ($text === '0') {
338	3	return '0000-00-00 00:00:00';
339		}
340		// MySQL actually recognises a bunch of other datetime formats,
341		// but YYYY-MM-DD and YYYY-MM-DD HH:MM:SS are the only ones we're
342		// prepared to accept.
343	14	if (preg_match('/^\d{4}-\d{2}-\d{2}$/', $text)) {
344	3	return "$text 00:00:00";
345		}
346	11	if (preg_match('/^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/', $text)) {
347	6	return $text;
348		}
349	5	throw new RuntimeException("Bad datetime");
350		}
351		}
352

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Token::setQuoteNames() A

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