IndexHint::buildAll() - Code Metrics - Inspection of "Merge pull request #483 from kamil-tekiela/Refacto..." - phpmyadmin/sql-parser - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( d70e65...52ffc4 )

by Maurício

created 2023-08-20 20:19 UTC

IndexHint::buildAll() A

↳ Parent: IndexHint

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

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

<?php

declare(strict_types=1);

namespace PhpMyAdmin\SqlParser\Components;

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

use function implode;

/**
 * Parses an Index hint.
 */
final class IndexHint implements Component
{
    /**
     * The type of hint (USE/FORCE/IGNORE)
     */
    public string|null $type;

    /**
     * What the hint is for (INDEX/KEY)
     */
    public string|null $indexOrKey;

    /**
     * The clause for which this hint is (JOIN/ORDER BY/GROUP BY)
     */
    public string|null $for;

    /**
     * List of indexes in this hint
     *
     * @var Expression[]
     */
    public array $indexes = [];

    /**
     * @param string       $type       the type of hint (USE/FORCE/IGNORE)
     * @param string       $indexOrKey What the hint is for (INDEX/KEY)
     * @param string       $for        the clause for which this hint is (JOIN/ORDER BY/GROUP BY)
     * @param Expression[] $indexes    List of indexes in this hint
     */
    public function __construct(
        string|null $type = null,
        string|null $indexOrKey = null,
        string|null $for = null,
        array $indexes = []
    ) {
        $this->type = $type;
        $this->indexOrKey = $indexOrKey;
        $this->for = $for;
        $this->indexes = $indexes;
    }

    /**
     * @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 IndexHint[]
     */
    public static function parse(Parser $parser, TokensList $list, array $options = []): array
    {
        $ret = [];
        $expr = new static();
        $expr->type = $options['type'] ?? null;
        /**
         * The state of the parser.
         *
         * Below are the states of the parser.
         *      0 ----------------- [ USE/IGNORE/FORCE ]-----------------> 1
         *      1 -------------------- [ INDEX/KEY ] --------------------> 2
         *      2 ----------------------- [ FOR ] -----------------------> 3
         *      2 -------------------- [ expr_list ] --------------------> 0
         *      3 -------------- [ JOIN/GROUP BY/ORDER BY ] -------------> 4
         *      4 -------------------- [ expr_list ] --------------------> 0
         *
         * @var int
         */
        $state = 0;

        // By design, the parser will parse first token after the keyword. So, the keyword
        // must be analyzed too, in order to determine the type of this index hint.
        if ($list->idx > 0) {
            --$list->idx;
        }

        for (; $list->idx < $list->count; ++$list->idx) {
            /**
             * Token parsed at this moment.
             */
            $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;
            }

            switch ($state) {
                case 0:
                    if ($token->type === Token::TYPE_KEYWORD) {
                        if ($token->keyword !== 'USE' && $token->keyword !== 'IGNORE' && $token->keyword !== 'FORCE') {
                            break 2;
                        }

                        $expr->type = $token->keyword;
                        $state = 1;
                    }

                    break;
                case 1:
                    if ($token->type === Token::TYPE_KEYWORD) {
                        if ($token->keyword === 'INDEX' || $token->keyword === 'KEY') {
                            $expr->indexOrKey = $token->keyword;
                        } else {
                            $parser->error('Unexpected keyword.', $token);
                        }

                        $state = 2;
                    } else {
                        // we expect the token to be a keyword
                        $parser->error('Unexpected token.', $token);
                    }

                    break;
                case 2:
                    if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'FOR') {
                        $state = 3;
                    } else {
                        $expr->indexes = ExpressionArray::parse($parser, $list);
                        $state = 0;
                        $ret[] = $expr;
                        $expr = new static();
                    }

                    break;
                case 3:
                    if ($token->type === Token::TYPE_KEYWORD) {
                        if (
                            $token->keyword === 'JOIN'
                            || $token->keyword === 'GROUP BY'
                            || $token->keyword === 'ORDER BY'
                        ) {
                            $expr->for = $token->keyword;
                        } else {
                            $parser->error('Unexpected keyword.', $token);
                        }

                        $state = 4;
                    } else {
                        // we expect the token to be a keyword
                        $parser->error('Unexpected token.', $token);
                    }

                    break;
                case 4:
                    $expr->indexes = ExpressionArray::parse($parser, $list);
                    $state = 0;
                    $ret[] = $expr;
                    $expr = new static();
                    break;
            }
        }

        --$list->idx;

        return $ret;
    }

    /**
     * @param IndexHint $component the component to be built
     */
    public static function build($component): string
    {
        $ret = $component->type . ' ' . $component->indexOrKey . ' ';
        if ($component->for !== null) {
            $ret .= 'FOR ' . $component->for . ' ';
        }

        return $ret . Expression::buildAll($component->indexes);
    }

    /**
     * @param IndexHint[] $component the component to be built
     */
    public static function buildAll(array $component): string
    {
        return implode(' ', $component);
    }

    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\Parser;
9		use PhpMyAdmin\SqlParser\Token;
10		use PhpMyAdmin\SqlParser\TokensList;
11
12		use function implode;
13
14		/**
15		* Parses an Index hint.
16		*/
17		final class IndexHint implements Component
18		{
19		/**
20		* The type of hint (USE/FORCE/IGNORE)
21		*/
22		public string\|null $type;
23
24		/**
25		* What the hint is for (INDEX/KEY)
26		*/
27		public string\|null $indexOrKey;
28
29		/**
30		* The clause for which this hint is (JOIN/ORDER BY/GROUP BY)
31		*/
32		public string\|null $for;
33
34		/**
35		* List of indexes in this hint
36		*
37		* @var Expression[]
38		*/
39		public array $indexes = [];
40
41		/**
42		* @param string $type the type of hint (USE/FORCE/IGNORE)
43		* @param string $indexOrKey What the hint is for (INDEX/KEY)
44		* @param string $for the clause for which this hint is (JOIN/ORDER BY/GROUP BY)
45		* @param Expression[] $indexes List of indexes in this hint
46		*/
47	14	public function __construct(
48		string\|null $type = null,
49		string\|null $indexOrKey = null,
50		string\|null $for = null,
51		array $indexes = []
52		) {
53	14	$this->type = $type;
54	14	$this->indexOrKey = $indexOrKey;
55	14	$this->for = $for;
56	14	$this->indexes = $indexes;
57		}
58
59		/**
60		* @param Parser $parser the parser that serves as context
61		* @param TokensList $list the list of tokens that are being parsed
62		* @param array<string, mixed> $options parameters for parsing
63		*
64		* @return IndexHint[]
65		*/
66	14	public static function parse(Parser $parser, TokensList $list, array $options = []): array
67		{
68	14	$ret = [];
69	14	$expr = new static();
70	14	$expr->type = $options['type'] ?? null;
71		/**
72		* The state of the parser.
73		*
74		* Below are the states of the parser.
75		* 0 ----------------- [ USE/IGNORE/FORCE ]-----------------> 1
76		* 1 -------------------- [ INDEX/KEY ] --------------------> 2
77		* 2 ----------------------- [ FOR ] -----------------------> 3
78		* 2 -------------------- [ expr_list ] --------------------> 0
79		* 3 -------------- [ JOIN/GROUP BY/ORDER BY ] -------------> 4
80		* 4 -------------------- [ expr_list ] --------------------> 0
81		*
82		* @var int
83		*/
84	14	$state = 0;
85
86		// By design, the parser will parse first token after the keyword. So, the keyword
87		// must be analyzed too, in order to determine the type of this index hint.
88	14	if ($list->idx > 0) {
89	14	--$list->idx;
90		}
91
92	14	for (; $list->idx < $list->count; ++$list->idx) {
93		/**
94		* Token parsed at this moment.
95		*/
96	14	$token = $list->tokens[$list->idx];
97
98		// End of statement.
99	14	if ($token->type === Token::TYPE_DELIMITER) {
100	8	break;
101		}
102
103		// Skipping whitespaces and comments.
104	14	if (($token->type === Token::TYPE_WHITESPACE) \|\| ($token->type === Token::TYPE_COMMENT)) {
105	14	continue;
106		}
107
108		switch ($state) {
109	14	case 0:
110	14	if ($token->type === Token::TYPE_KEYWORD) {
111	14	if ($token->keyword !== 'USE' && $token->keyword !== 'IGNORE' && $token->keyword !== 'FORCE') {
112	6	break 2;
113		}
114
115	14	$expr->type = $token->keyword;
116	14	$state = 1;
117		}
118
119	14	break;
120	14	case 1:
121	14	if ($token->type === Token::TYPE_KEYWORD) {
122	12	if ($token->keyword === 'INDEX' \|\| $token->keyword === 'KEY') {
123	10	$expr->indexOrKey = $token->keyword;
124		} else {
125	2	$parser->error('Unexpected keyword.', $token);
126		}
127
128	12	$state = 2;
129		} else {
130		// we expect the token to be a keyword
131	2	$parser->error('Unexpected token.', $token);
132		}
133
134	14	break;
135	12	case 2:
136	12	if ($token->type === Token::TYPE_KEYWORD && $token->keyword === 'FOR') {
137	10	$state = 3;
138		} else {
139	8	$expr->indexes = ExpressionArray::parse($parser, $list);
140	8	$state = 0;
141	8	$ret[] = $expr;
142	8	$expr = new static();
143		}
144
145	12	break;
146	10	case 3:
147	10	if ($token->type === Token::TYPE_KEYWORD) {
148		if (
149	8	$token->keyword === 'JOIN'
150	8	\|\| $token->keyword === 'GROUP BY'
151	8	\|\| $token->keyword === 'ORDER BY'
152		) {
153	6	$expr->for = $token->keyword;
154		} else {
155	2	$parser->error('Unexpected keyword.', $token);
156		}
157
158	8	$state = 4;
159		} else {
160		// we expect the token to be a keyword
161	2	$parser->error('Unexpected token.', $token);
162		}
163
164	10	break;
165	8	case 4:
166	8	$expr->indexes = ExpressionArray::parse($parser, $list);
167	8	$state = 0;
168	8	$ret[] = $expr;
169	8	$expr = new static();
170	8	break;
171		}
172		}
173
174	14	--$list->idx;
175
176	14	return $ret;
177		}
178
179		/**
180		* @param IndexHint $component the component to be built
181		*/
182	2	public static function build($component): string
183		{
184	2	$ret = $component->type . ' ' . $component->indexOrKey . ' ';
185	2	if ($component->for !== null) {
186	2	$ret .= 'FOR ' . $component->for . ' ';
187		}
188
189	2	return $ret . Expression::buildAll($component->indexes);
190		}
191
192		/**
193		* @param IndexHint[] $component the component to be built
194		*/
195	2	public static function buildAll(array $component): string
196		{
197	2	return implode(' ', $component);
198		}
199
200	2	public function __toString(): string
201		{
202	2	return static::build($this);
203		}
204		}
205

phpmyadmin / sql-parser

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IndexHint::buildAll() A

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