CaseExpressions::parse() - Code Metrics - Inspection of "Merge pull request #543 from kamil-tekiela/Refacto..." - phpmyadmin/sql-parser - Measure and Improve Code Quality continuously with Scrutinizer

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by Maurício

created 2024-01-23 18:09 UTC

CaseExpressions::parse() F

↳ Parent: CaseExpressions

Complexity

Conditions	43
Paths	260

Size

Total Lines	173
Code Lines	114

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	109
CRAP Score	43

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	43
eloc	114
nc	260
nop	3
dl	0
loc	173
ccs	109
cts	109
cp	1
crap	43
rs	2.0666
c	1
b	0
f	0

How to fix Long Method Complexity

<?php

declare(strict_types=1);

namespace PhpMyAdmin\SqlParser\Parsers;

use PhpMyAdmin\SqlParser\Components\CaseExpression;
use PhpMyAdmin\SqlParser\Parseable;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
use PhpMyAdmin\SqlParser\TokenType;

/**
 * Parses a reference to a CASE expression.
 */
final class CaseExpressions implements Parseable
{
    /**
     * @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
     */
    public static function parse(Parser $parser, TokensList $list, array $options = []): CaseExpression
    {
        $ret = new CaseExpression();

        /**
         * State of parser.
         */
        $state = 0;

        /**
         * Syntax type (type 0 or type 1).
         */
        $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 (($token->type === TokenType::Whitespace) || ($token->type === TokenType::Comment)) {
                continue;
            }

            if ($state === 0) {
                if ($token->type === TokenType::Keyword) {
                    switch ($token->keyword) {
                        case 'WHEN':
                            ++$list->idx; // Skip 'WHEN'
                            $newCondition = Conditions::parse($parser, $list);
                            $type = 1;
                            $state = 1;
                            $ret->conditions[] = $newCondition;
                            break;
                        case 'ELSE':
                            ++$list->idx; // Skip 'ELSE'
                            $ret->elseResult = Expressions::parse($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 {
                    $ret->value = Expressions::parse($parser, $list);
                    $type = 0;
                    $state = 1;
                }
            } elseif ($state === 1) {
                if ($type === 0) {
                    if ($token->type === TokenType::Keyword) {
                        switch ($token->keyword) {
                            case 'WHEN':
                                ++$list->idx; // Skip 'WHEN'
                                $newValue = Expressions::parse($parser, $list);
                                $state = 2;
                                $ret->compareValues[] = $newValue;
                                break;
                            case 'ELSE':
                                ++$list->idx; // Skip 'ELSE'
                                $ret->elseResult = Expressions::parse($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.', $token);
                                break 2;
                        }
                    }
                } elseif ($token->type === TokenType::Keyword && $token->keyword === 'THEN') {
                    ++$list->idx; // Skip 'THEN'
                    $newResult = Expressions::parse($parser, $list);
                    $state = 0;
                    $ret->results[] = $newResult;
                } elseif ($token->type === TokenType::Keyword) {
                    $parser->error('Unexpected keyword.', $token);
                    break;
                }
            } elseif ($state === 2) {
                if ($type === 0) {
                    if ($token->type === TokenType::Keyword && $token->keyword === 'THEN') {
                        ++$list->idx; // Skip 'THEN'
                        $newResult = Expressions::parse($parser, $list);
                        $ret->results[] = $newResult;
                        $state = 1;
                    } elseif ($token->type === TokenType::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 === TokenType::Delimiter) {
                    break;
                }

                // Skipping whitespaces and comments.
                if (($token->type === TokenType::Whitespace) || ($token->type === TokenType::Comment)) {
                    continue;
                }

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

                    $asFound = true;
                    continue;
                }

                if (
                    $asFound
                    && $token->type === TokenType::Keyword
                    && ($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
                    || $token->type === TokenType::String
                    || ($token->type === TokenType::Symbol && ! $token->flags & Token::FLAG_SYMBOL_VARIABLE)
                    || $token->type === TokenType::None
                ) {
                    // An alias is expected (the keyword `AS` was previously found).
                    if (! empty($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 = $ret->build();
        }

        --$list->idx;

        return $ret;
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace PhpMyAdmin\SqlParser\Parsers;
6
7		use PhpMyAdmin\SqlParser\Components\CaseExpression;
8		use PhpMyAdmin\SqlParser\Parseable;
9		use PhpMyAdmin\SqlParser\Parser;
10		use PhpMyAdmin\SqlParser\Token;
11		use PhpMyAdmin\SqlParser\TokensList;
12		use PhpMyAdmin\SqlParser\TokenType;
13
14		/**
15		* Parses a reference to a CASE expression.
16		*/
17		final class CaseExpressions implements Parseable
18		{
19		/**
20		* @param Parser $parser the parser that serves as context
21		* @param TokensList $list the list of tokens that are being parsed
22		* @param array<string, mixed> $options parameters for parsing
23		*/
24	64	public static function parse(Parser $parser, TokensList $list, array $options = []): CaseExpression
25		{
26	64	$ret = new CaseExpression();
27
28		/**
29		* State of parser.
30		*/
31	64	$state = 0;
32
33		/**
34		* Syntax type (type 0 or type 1).
35		*/
36	64	$type = 0;
37
38	64	++$list->idx; // Skip 'CASE'
39
40	64	for (; $list->idx < $list->count; ++$list->idx) {
41		/**
42		* Token parsed at this moment.
43		*/
44	64	$token = $list->tokens[$list->idx];
45
46		// Skipping whitespaces and comments.
47	64	if (($token->type === TokenType::Whitespace) \|\| ($token->type === TokenType::Comment)) {
48	64	continue;
49		}
50
51	64	if ($state === 0) {
52	64	if ($token->type === TokenType::Keyword) {
53	48	switch ($token->keyword) {
54	48	case 'WHEN':
55	30	++$list->idx; // Skip 'WHEN'
56	30	$newCondition = Conditions::parse($parser, $list);
57	30	$type = 1;
58	30	$state = 1;
59	30	$ret->conditions[] = $newCondition;
60	30	break;
61	46	case 'ELSE':
62	16	++$list->idx; // Skip 'ELSE'
63	16	$ret->elseResult = Expressions::parse($parser, $list);
64	16	$state = 0; // last clause of CASE expression
65	16	break;
66	46	case 'END':
67	44	$state = 3; // end of CASE expression
68	44	++$list->idx;
69	44	break 2;
70		default:
71	2	$parser->error('Unexpected keyword.', $token);
72	2	break 2;
73		}
74		} else {
75	32	$ret->value = Expressions::parse($parser, $list);
76	32	$type = 0;
77	32	$state = 1;
78		}
79	62	} elseif ($state === 1) {
80	62	if ($type === 0) {
81	32	if ($token->type === TokenType::Keyword) {
82	32	switch ($token->keyword) {
83	32	case 'WHEN':
84	28	++$list->idx; // Skip 'WHEN'
85	28	$newValue = Expressions::parse($parser, $list);
86	28	$state = 2;
87	28	$ret->compareValues[] = $newValue;
88	28	break;
89	30	case 'ELSE':
90	16	++$list->idx; // Skip 'ELSE'
91	16	$ret->elseResult = Expressions::parse($parser, $list);
92	16	$state = 0; // last clause of CASE expression
93	16	break;
94	14	case 'END':
95	10	$state = 3; // end of CASE expression
96	10	++$list->idx;
97	10	break 2;
98		default:
99	4	$parser->error('Unexpected keyword.', $token);
100	4	break 2;
101		}
102		}
103	30	} elseif ($token->type === TokenType::Keyword && $token->keyword === 'THEN') {
104	28	++$list->idx; // Skip 'THEN'
105	28	$newResult = Expressions::parse($parser, $list);
106	28	$state = 0;
107	28	$ret->results[] = $newResult;
108	2	} elseif ($token->type === TokenType::Keyword) {
109	2	$parser->error('Unexpected keyword.', $token);
110	2	break;
111		}
112	28	} elseif ($state === 2) {
113	28	if ($type === 0) {
114	28	if ($token->type === TokenType::Keyword && $token->keyword === 'THEN') {
115	28	++$list->idx; // Skip 'THEN'
116	28	$newResult = Expressions::parse($parser, $list);
117	28	$ret->results[] = $newResult;
118	28	$state = 1;
119	2	} elseif ($token->type === TokenType::Keyword) {
120	2	$parser->error('Unexpected keyword.', $token);
121	2	break;
122		}
123		}
124		}
125		}
126
127	64	if ($state !== 3) {
128	10	$parser->error('Unexpected end of CASE expression', $list->tokens[$list->idx - 1]);
129		} else {
130		// Parse for alias of CASE expression
131	54	$asFound = false;
132	54	for (; $list->idx < $list->count; ++$list->idx) {
133	54	$token = $list->tokens[$list->idx];
134
135		// End of statement.
136	54	if ($token->type === TokenType::Delimiter) {
137	20	break;
138		}
139
140		// Skipping whitespaces and comments.
141	40	if (($token->type === TokenType::Whitespace) \|\| ($token->type === TokenType::Comment)) {
142	40	continue;
143		}
144
145		// Handle optional AS keyword before alias
146	40	if ($token->type === TokenType::Keyword && $token->keyword === 'AS') {
147	20	if ($asFound \|\| ! empty($ret->alias)) {
148	2	$parser->error('Potential duplicate alias of CASE expression.', $token);
149	2	break;
150		}
151
152	20	$asFound = true;
153	20	continue;
154		}
155
156		if (
157	36	$asFound
158	36	&& $token->type === TokenType::Keyword
159	36	&& ($token->flags & Token::FLAG_KEYWORD_RESERVED \|\| $token->flags & Token::FLAG_KEYWORD_FUNCTION)
160		) {
161	2	$parser->error('An alias expected after AS but got ' . $token->value, $token);
162	2	$asFound = false;
163	2	break;
164		}
165
166		if (
167	34	$asFound
168	32	\|\| $token->type === TokenType::String
169	32	\|\| ($token->type === TokenType::Symbol && ! $token->flags & Token::FLAG_SYMBOL_VARIABLE)
170	34	\|\| $token->type === TokenType::None
171		) {
172		// An alias is expected (the keyword `AS` was previously found).
173	20	if (! empty($ret->alias)) {
174	2	$parser->error('An alias was previously found.', $token);
175	2	break;
176		}
177
178	20	$ret->alias = $token->value;
179	20	$asFound = false;
180
181	20	continue;
182		}
183
184	28	break;
185		}
186
187	54	if ($asFound) {
188	4	$parser->error('An alias was expected after AS.', $list->tokens[$list->idx - 1]);
189		}
190
191	54	$ret->expr = $ret->build();
192		}
193
194	64	--$list->idx;
195
196	64	return $ret;
197		}
198		}
199

phpmyadmin / sql-parser

Push — master ( b16987...8b6d77 )

CaseExpressions::parse() F

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