CaseExpression::build() - Code Metrics - Inspection of "Fix new property names on 6.0 for the custom seria..." - phpmyadmin/sql-parser - Measure and Improve Code Quality continuously with Scrutinizer

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by William

created 2023-03-28 13:50 UTC

CaseExpression::build() B

↳ Parent: CaseExpression

Complexity

Conditions	8
Paths	16

Size

Total Lines	33
Code Lines	20

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	20
CRAP Score	8

Importance

Changes

Metric	Value
cc	8
eloc	20
nc	16
nop	2
dl	0
loc	33
ccs	20
cts	20
cp	1
crap	8
rs	8.4444
c	0
b	0
f	0

<?php

declare(strict_types=1);

namespace PhpMyAdmin\SqlParser\Components;

use PhpMyAdmin\SqlParser\Component;
use PhpMyAdmin\SqlParser\Context;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;

use function count;

/**
 * Parses a reference to a CASE expression.
 */
final class CaseExpression implements Component
{
    /**
     * The value to be compared.
     *
     * @var Expression|null
     */
    public $value;

    /**
     * The conditions in WHEN clauses.
     *
     * @var Condition[][]
     */
    public $conditions = [];

    /**
     * The results matching with the WHEN clauses.
     *
     * @var Expression[]
     */
    public $results = [];

    /**
     * The values to be compared against.
     *
     * @var Expression[]
     */
    public $compareValues = [];

    /**
     * The result in ELSE section of expr.
     *
     * @var Expression|null
     */
    public $elseResult;

    /**
     * The alias of this CASE statement.
     *
     * @var string|null
     */
    public $alias;

    /**
     * The sub-expression.
     *
     * @var string
     */
    public $expr = '';

    public function __construct()
    {
    }

    /**
     * @param Parser               $parser  the parser that serves as context
     * @param TokensList           $list    the list of tokens that are being parsed
     * @param array<string, mixed> $options parameters for parsing
     *
     * @return CaseExpression
     */
    public static function parse(Parser $parser, TokensList $list, array $options = [])
    {
        $ret = new static();

        /**
         * State of parser.
         *
         * @var int
         */
        $state = 0;

        /**
         * Syntax type (type 0 or type 1).
         *
         * @var int
         */
        $type = 0;

        ++$list->idx; // Skip 'CASE'

        for (; $list->idx < $list->count; ++$list->idx) {
            /**
             * Token parsed at this moment.
             */
            $token = $list->tokens[$list->idx];

            // Skipping whitespaces and comments.
            if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
                continue;
            }

            if ($state === 0) {
                if ($token->type === Token::TYPE_KEYWORD) {
                    switch ($token->keyword) {
                        case 'WHEN':
                            ++$list->idx; // Skip 'WHEN'
                            $newCondition = Condition::parse($parser, $list);
                            $type = 1;
                            $state = 1;
                            $ret->conditions[] = $newCondition;
                            break;
                        case 'ELSE':
                            ++$list->idx; // Skip 'ELSE'
                            $ret->elseResult = Expression::parse($parser, $list);
                            $state = 0; // last clause of CASE expression
                            break;
                        case 'END':
                            $state = 3; // end of CASE expression
                            ++$list->idx;
                            break 2;
                        default:
                            $parser->error('Unexpected keyword.', $token);
                            break 2;
                    }
                } else {
                    $ret->value = Expression::parse($parser, $list);
                    $type = 0;
                    $state = 1;
                }
            } elseif ($state === 1) {
                if ($type === 0) {
                    if ($token->type === Token::TYPE_KEYWORD) {
                        switch ($token->keyword) {
                            case 'WHEN':
                                ++$list->idx; // Skip 'WHEN'
                                $newValue = Expression::parse($parser, $list);
                                $state = 2;
                                $ret->compareValues[] = $newValue;
                                break;
                            case 'ELSE':
                                ++$list->idx; // Skip 'ELSE'
                                $ret->elseResult = Expression::parse($parser, $list);
                                $state = 0; // last clause of CASE expression
                                break;
                            case 'END':
                                $state = 3; // end of CASE expression
                                ++$list->idx;
                                break 2;
                            default:
                                $parser->error('Unexpected keyword.', $token);
                                break 2;
                        }
                    }
                } else {
                    if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'THEN') {
                        ++$list->idx; // Skip 'THEN'
                        $newResult = Expression::parse($parser, $list);
                        $state = 0;
                        $ret->results[] = $newResult;
                    } elseif ($token->type === Token::TYPE_KEYWORD) {
                        $parser->error('Unexpected keyword.', $token);
                        break;
                    }
                }
            } elseif ($state === 2) {
                if ($type === 0) {
                    if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'THEN') {
                        ++$list->idx; // Skip 'THEN'
                        $newResult = Expression::parse($parser, $list);
                        $ret->results[] = $newResult;
                        $state = 1;
                    } elseif ($token->type === Token::TYPE_KEYWORD) {
                        $parser->error('Unexpected keyword.', $token);
                        break;
                    }
                }
            }
        }

        if ($state !== 3) {
            $parser->error('Unexpected end of CASE expression', $list->tokens[$list->idx - 1]);
        } else {
            // Parse for alias of CASE expression
            $asFound = false;
            for (; $list->idx < $list->count; ++$list->idx) {
                $token = $list->tokens[$list->idx];

                // End of statement.
                if ($token->type === Token::TYPE_DELIMITER) {
                    break;
                }

                // Skipping whitespaces and comments.
                if (($token->type === Token::TYPE_WHITESPACE) || ($token->type === Token::TYPE_COMMENT)) {
                    continue;
                }

                // Handle optional AS keyword before alias
                if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'AS') {
                    if ($asFound || ! empty($ret->alias)) {
                        $parser->error('Potential duplicate alias of CASE expression.', $token);
                        break;
                    }

                    $asFound = true;
                    continue;
                }

                if (
                    $asFound
                    && $token->type === Token::TYPE_KEYWORD
                    && ($token->flags & Token::FLAG_KEYWORD_RESERVED || $token->flags & Token::FLAG_KEYWORD_FUNCTION)
                ) {
                    $parser->error('An alias expected after AS but got ' . $token->value, $token);
                    $asFound = false;
                    break;
                }

                if (
                    $asFound
                    || $token->type === Token::TYPE_STRING
                    || ($token->type === Token::TYPE_SYMBOL && ! $token->flags & Token::FLAG_SYMBOL_VARIABLE)
                    || $token->type === Token::TYPE_NONE
                ) {
                    // An alias is expected (the keyword `AS` was previously found).
                    if (! empty($ret->alias)) {
                        $parser->error('An alias was previously found.', $token);
                        break;
                    }

                    $ret->alias = $token->value;
                    $asFound = false;

                    continue;
                }

                break;
            }

            if ($asFound) {
                $parser->error('An alias was expected after AS.', $list->tokens[$list->idx - 1]);
            }

            $ret->expr = self::build($ret);
        }

        --$list->idx;

        return $ret;
    }

    /**
     * @param CaseExpression       $component the component to be built
     * @param array<string, mixed> $options   parameters for building
     */
    public static function build($component, array $options = []): string
    {
        $ret = 'CASE ';
        if (isset($component->value)) {
            // Syntax type 0
            $ret .= $component->value . ' ';
            $valuesCount = count($component->compareValues);
            $resultsCount = count($component->results);
            for ($i = 0; $i < $valuesCount && $i < $resultsCount; ++$i) {
                $ret .= 'WHEN ' . $component->compareValues[$i] . ' ';
                $ret .= 'THEN ' . $component->results[$i] . ' ';
            }
        } else {
            // Syntax type 1
            $valuesCount = count($component->conditions);
            $resultsCount = count($component->results);
            for ($i = 0; $i < $valuesCount && $i < $resultsCount; ++$i) {
                $ret .= 'WHEN ' . Condition::build($component->conditions[$i]) . ' ';
                $ret .= 'THEN ' . $component->results[$i] . ' ';
            }
        }

        if (isset($component->elseResult)) {
            $ret .= 'ELSE ' . $component->elseResult . ' ';
        }

        $ret .= 'END';

        if ($component->alias) {
            $ret .= ' AS ' . Context::escape($component->alias);
        }

        return $ret;
    }

    public function __toString(): string
    {
        return static::build($this);
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace PhpMyAdmin\SqlParser\Components;
6
7		use PhpMyAdmin\SqlParser\Component;
8		use PhpMyAdmin\SqlParser\Context;
9		use PhpMyAdmin\SqlParser\Parser;
10		use PhpMyAdmin\SqlParser\Token;
11		use PhpMyAdmin\SqlParser\TokensList;
12
13		use function count;
14
15		/**
16		* Parses a reference to a CASE expression.
17		*/
18		final class CaseExpression implements Component
19		{
20		/**
21		* The value to be compared.
22		*
23		* @var Expression\|null
24		*/
25		public $value;
26
27		/**
28		* The conditions in WHEN clauses.
29		*
30		* @var Condition[][]
31		*/
32		public $conditions = [];
33
34		/**
35		* The results matching with the WHEN clauses.
36		*
37		* @var Expression[]
38		*/
39		public $results = [];
40
41		/**
42		* The values to be compared against.
43		*
44		* @var Expression[]
45		*/
46		public $compareValues = [];
47
48		/**
49		* The result in ELSE section of expr.
50		*
51		* @var Expression\|null
52		*/
53		public $elseResult;
54
55		/**
56		* The alias of this CASE statement.
57		*
58		* @var string\|null
59		*/
60		public $alias;
61
62		/**
63		* The sub-expression.
64		*
65		* @var string
66		*/
67		public $expr = '';
68
69	66	public function __construct()
70		{
71	66	}
72
73		/**
74		* @param Parser $parser the parser that serves as context
75		* @param TokensList $list the list of tokens that are being parsed
76		* @param array<string, mixed> $options parameters for parsing
77		*
78		* @return CaseExpression
79		*/
80	64	public static function parse(Parser $parser, TokensList $list, array $options = [])
81		{
82	64	$ret = new static();
83
84		/**
85		* State of parser.
86		*
87		* @var int
88		*/
89	64	$state = 0;
90
91		/**
92		* Syntax type (type 0 or type 1).
93		*
94		* @var int
95		*/
96	64	$type = 0;
97
98	64	++$list->idx; // Skip 'CASE'
99
100	64	for (; $list->idx < $list->count; ++$list->idx) {
101		/**
102		* Token parsed at this moment.
103		*/
104	64	$token = $list->tokens[$list->idx];
105
106		// Skipping whitespaces and comments.
107	64	if (($token->type === Token::TYPE_WHITESPACE) \|\| ($token->type === Token::TYPE_COMMENT)) {
108	64	continue;
109		}
110
111	64	if ($state === 0) {
112	64	if ($token->type === Token::TYPE_KEYWORD) {
113	48	switch ($token->keyword) {
114	48	case 'WHEN':
115	30	++$list->idx; // Skip 'WHEN'
116	30	$newCondition = Condition::parse($parser, $list);
117	30	$type = 1;
118	30	$state = 1;
119	30	$ret->conditions[] = $newCondition;
120	30	break;
121	46	case 'ELSE':
122	16	++$list->idx; // Skip 'ELSE'
123	16	$ret->elseResult = Expression::parse($parser, $list);
124	16	$state = 0; // last clause of CASE expression
125	16	break;
126	46	case 'END':
127	44	$state = 3; // end of CASE expression
128	44	++$list->idx;
129	44	break 2;
130		default:
131	2	$parser->error('Unexpected keyword.', $token);
132	32	break 2;
133		}
134		} else {
135	32	$ret->value = Expression::parse($parser, $list);
136	32	$type = 0;
137	62	$state = 1;
138		}
139	62	} elseif ($state === 1) {
140	62	if ($type === 0) {
141	32	if ($token->type === Token::TYPE_KEYWORD) {
142	32	switch ($token->keyword) {
143	32	case 'WHEN':
144	28	++$list->idx; // Skip 'WHEN'
145	28	$newValue = Expression::parse($parser, $list);
146	28	$state = 2;
147	28	$ret->compareValues[] = $newValue;
148	28	break;
149	30	case 'ELSE':
150	16	++$list->idx; // Skip 'ELSE'
151	16	$ret->elseResult = Expression::parse($parser, $list);
152	16	$state = 0; // last clause of CASE expression
153	16	break;
154	14	case 'END':
155	10	$state = 3; // end of CASE expression
156	10	++$list->idx;
157	10	break 2;
158		default:
159	4	$parser->error('Unexpected keyword.', $token);
160	32	break 2;
161		}
162		}
163		} else {
164	30	if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'THEN') {
165	28	++$list->idx; // Skip 'THEN'
166	28	$newResult = Expression::parse($parser, $list);
167	28	$state = 0;
168	28	$ret->results[] = $newResult;
169	2	} elseif ($token->type === Token::TYPE_KEYWORD) {
170	2	$parser->error('Unexpected keyword.', $token);
171	58	break;
172		}
173		}
174	28	} elseif ($state === 2) {
175	28	if ($type === 0) {
176	28	if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'THEN') {
177	28	++$list->idx; // Skip 'THEN'
178	28	$newResult = Expression::parse($parser, $list);
179	28	$ret->results[] = $newResult;
180	28	$state = 1;
181	2	} elseif ($token->type === Token::TYPE_KEYWORD) {
182	2	$parser->error('Unexpected keyword.', $token);
183	2	break;
184		}
185		}
186		}
187		}
188
189	64	if ($state !== 3) {
190	10	$parser->error('Unexpected end of CASE expression', $list->tokens[$list->idx - 1]);
191		} else {
192		// Parse for alias of CASE expression
193	54	$asFound = false;
194	54	for (; $list->idx < $list->count; ++$list->idx) {
195	54	$token = $list->tokens[$list->idx];
196
197		// End of statement.
198	54	if ($token->type === Token::TYPE_DELIMITER) {
199	20	break;
200		}
201
202		// Skipping whitespaces and comments.
203	40	if (($token->type === Token::TYPE_WHITESPACE) \|\| ($token->type === Token::TYPE_COMMENT)) {
204	40	continue;
205		}
206
207		// Handle optional AS keyword before alias
208	40	if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'AS') {
209	20	if ($asFound \|\| ! empty($ret->alias)) {
210	2	$parser->error('Potential duplicate alias of CASE expression.', $token);
211	2	break;
212		}
213
214	20	$asFound = true;
215	20	continue;
216		}
217
218		if (
219	36	$asFound
220	36	&& $token->type === Token::TYPE_KEYWORD
221	36	&& ($token->flags & Token::FLAG_KEYWORD_RESERVED \|\| $token->flags & Token::FLAG_KEYWORD_FUNCTION)
222		) {
223	2	$parser->error('An alias expected after AS but got ' . $token->value, $token);
224	2	$asFound = false;
225	2	break;
226		}
227
228		if (
229	34	$asFound
230	32	\|\| $token->type === Token::TYPE_STRING
231	32	\|\| ($token->type === Token::TYPE_SYMBOL && ! $token->flags & Token::FLAG_SYMBOL_VARIABLE)
232	34	\|\| $token->type === Token::TYPE_NONE
233		) {
234		// An alias is expected (the keyword `AS` was previously found).
235	20	if (! empty($ret->alias)) {
236	2	$parser->error('An alias was previously found.', $token);
237	2	break;
238		}
239
240	20	$ret->alias = $token->value;
241	20	$asFound = false;
242
243	20	continue;
244		}
245
246	28	break;
247		}
248
249	54	if ($asFound) {
250	4	$parser->error('An alias was expected after AS.', $list->tokens[$list->idx - 1]);
251		}
252
253	54	$ret->expr = self::build($ret);
254		}
255
256	64	--$list->idx;
257
258	64	return $ret;
259		}
260
261		/**
262		* @param CaseExpression $component the component to be built
263		* @param array<string, mixed> $options parameters for building
264		*/
265	56	public static function build($component, array $options = []): string
266		{
267	56	$ret = 'CASE ';
268	56	if (isset($component->value)) {
269		// Syntax type 0
270	26	$ret .= $component->value . ' ';
271	26	$valuesCount = count($component->compareValues);
272	26	$resultsCount = count($component->results);
273	26	for ($i = 0; $i < $valuesCount && $i < $resultsCount; ++$i) {
274	26	$ret .= 'WHEN ' . $component->compareValues[$i] . ' ';
275	26	$ret .= 'THEN ' . $component->results[$i] . ' ';
276		}
277		} else {
278		// Syntax type 1
279	30	$valuesCount = count($component->conditions);
280	30	$resultsCount = count($component->results);
281	30	for ($i = 0; $i < $valuesCount && $i < $resultsCount; ++$i) {
282	28	$ret .= 'WHEN ' . Condition::build($component->conditions[$i]) . ' ';
283	28	$ret .= 'THEN ' . $component->results[$i] . ' ';
284		}
285		}
286
287	56	if (isset($component->elseResult)) {
288	32	$ret .= 'ELSE ' . $component->elseResult . ' ';
289		}
290
291	56	$ret .= 'END';
292
293	56	if ($component->alias) {
294	20	$ret .= ' AS ' . Context::escape($component->alias);
295		}
296
297	56	return $ret;
298		}
299
300		public function __toString(): string
301		{
302		return static::build($this);
303		}
304		}
305

phpmyadmin / sql-parser

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CaseExpression::build() B

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