Expression::__construct() - Code Metrics - Inspection of "Translated using Weblate (Belarusian)" - phpmyadmin/sql-parser - Measure and Improve Code Quality continuously with Scrutinizer

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created 2023-12-07 16:30 UTC

Expression::__construct() A

↳ Parent: Expression

Complexity

Conditions	3
Paths	2

Size

Total Lines	10
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	8
CRAP Score	3

Importance

Changes

Metric	Value
cc	3
eloc	8
nc	2
nop	4
dl	0
loc	10
ccs	8
cts	8
cp	1
crap	3
rs	10
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\Exceptions\ParserException;
use PhpMyAdmin\SqlParser\Parser;
use PhpMyAdmin\SqlParser\Token;
use PhpMyAdmin\SqlParser\TokensList;
use PhpMyAdmin\SqlParser\TokenType;

use function implode;
use function rtrim;
use function strlen;
use function trim;

/**
 * Parses a reference to an expression (column, table or database name, function
 * call, mathematical expression, etc.).
 */
#[\AllowDynamicProperties]
final class Expression implements Component
{
    /**
     * List of allowed reserved keywords in expressions.
     */
    private const ALLOWED_KEYWORDS = [
        'AND' => 1,
        'AS' => 1,
        'BETWEEN' => 1,
        'CASE' => 1,
        'DUAL' => 1,
        'DIV' => 1,
        'IS' => 1,
        'MOD' => 1,
        'NOT' => 1,
        'NOT NULL' => 1,
        'NULL' => 1,
        'OR' => 1,
        'OVER' => 1,
        'REGEXP' => 1,
        'RLIKE' => 1,
        'XOR' => 1,
    ];

    /**
     * The name of this database.
     *
     * @var string|null
     */
    public $database;

    /**
     * The name of this table.
     *
     * @var string|null
     */
    public $table;

    /**
     * The name of the column.
     *
     * @var string|null
     */
    public $column;

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

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

    /**
     * The name of the function.
     *
     * @var mixed
     */
    public $function;

    /**
     * The type of subquery.
     *
     * @var string|null
     */
    public $subquery;

    /**
     * Syntax:
     *     new Expression('expr')
     *     new Expression('expr', 'alias')
     *     new Expression('database', 'table', 'column')
     *     new Expression('database', 'table', 'column', 'alias')
     *
     * If the database, table or column name is not required, pass an empty
     * string.
     *
     * @param string|null $database The name of the database or the expression.
     * @param string|null $table    The name of the table or the alias of the expression.
     * @param string|null $column   the name of the column
     * @param string|null $alias    the name of the alias
     */
    public function __construct($database = null, $table = null, $column = null, $alias = null)
    {
        if (($column === null) && ($alias === null)) {
            $this->expr = $database; // case 1
            $this->alias = $table; // case 2
        } else {
            $this->database = $database; // case 3
            $this->table = $table; // case 3
            $this->column = $column; // case 3
            $this->alias = $alias; // case 4
        }
    }

    /**
     * Possible options:.
     *
     *      `field`
     *
     *          First field to be filled.
     *          If this is not specified, it takes the value of `parseField`.
     *
     *      `parseField`
     *
     *          Specifies the type of the field parsed. It may be `database`,
     *          `table` or `column`. These expressions may not include
     *          parentheses.
     *
     *      `breakOnAlias`
     *
     *          If not empty, breaks when the alias occurs (it is not included).
     *
     *      `breakOnParentheses`
     *
     *          If not empty, breaks when the first parentheses occurs.
     *
     *      `parenthesesDelimited`
     *
     *          If not empty, breaks after last parentheses occurred.
     *
     * @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
     *
     * @throws ParserException
     */
    public static function parse(Parser $parser, TokensList $list, array $options = []): Expression|null
    {
        $ret = new static();

        /**
         * Whether current tokens make an expression or a table reference.
         *
         * @var bool
         */
        $isExpr = false;

        /**
         * Whether a period was previously found.
         *
         * @var bool
         */
        $dot = false;

        /**
         * Whether an alias is expected. Is 2 if `AS` keyword was found.
         *
         * @var bool
         */
        $alias = false;

        /**
         * Counts brackets.
         *
         * @var int
         */
        $brackets = 0;

        /**
         * Keeps track of the last two previous tokens.
         *
         * @var Token[]
         */
        $prev = [
            null,
            null,
        ];

        // When a field is parsed, no parentheses are expected.
        if (! empty($options['parseField'])) {
            $options['breakOnParentheses'] = true;
            $options['field'] = $options['parseField'];
        }

        for (; $list->idx < $list->count; ++$list->idx) {
            /**
             * Token parsed at this moment.
             */
            $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)) {
                // If the token is a closing C comment from a MySQL command, it must be ignored.
                if ($isExpr && $token->token !== '*/') {
                    $ret->expr .= $token->token;
                }

                continue;
            }

            if ($token->type === TokenType::Keyword) {
                if (($brackets > 0) && empty($ret->subquery) && ! empty(Parser::STATEMENT_PARSERS[$token->keyword])) {
                    // A `(` was previously found and this keyword is the
                    // beginning of a statement, so this is a subquery.
                    $ret->subquery = $token->keyword;
                } elseif (
                    ($token->flags & Token::FLAG_KEYWORD_FUNCTION)
                    && (empty($options['parseField'])
                    && ! $alias)
                ) {
                    $isExpr = true;
                } elseif (($token->flags & Token::FLAG_KEYWORD_RESERVED) && ($brackets === 0)) {
                    if (empty(self::ALLOWED_KEYWORDS[$token->keyword])) {
                        // A reserved keyword that is not allowed in the
                        // expression was found so the expression must have
                        // ended and a new clause is starting.
                        break;
                    }

                    if ($token->keyword === 'AS') {
                        if (! empty($options['breakOnAlias'])) {
                            break;
                        }

                        if ($alias) {
                            $parser->error('An alias was expected.', $token);
                            break;
                        }

                        $alias = true;
                        continue;
                    }

                    if ($token->keyword === 'CASE') {
                        // For a use of CASE like
                        // 'SELECT a = CASE .... END, b=1, `id`, ... FROM ...'
                        $tempCaseExpr = CaseExpression::parse($parser, $list);
                        $ret->expr .= $tempCaseExpr->build();
                        $isExpr = true;
                        continue;
                    }

                    $isExpr = true;
                } elseif ($brackets === 0 && strlen((string) $ret->expr) > 0 && ! $alias) {
                    /* End of expression */
                    break;
                }
            }

            if (
                ($token->type === TokenType::Number)
                || ($token->type === TokenType::Bool)
                || (($token->type === TokenType::Symbol)
                && ($token->flags & Token::FLAG_SYMBOL_VARIABLE))
                || (($token->type === TokenType::Symbol)
                && ($token->flags & Token::FLAG_SYMBOL_PARAMETER))
                || (($token->type === TokenType::Operator)
                && ($token->value !== '.'))
            ) {
                if (! empty($options['parseField'])) {
                    break;
                }

                // Numbers, booleans and operators (except dot) are usually part
                // of expressions.
                $isExpr = true;
            }

            if ($token->type === TokenType::Operator) {
                if (! empty($options['breakOnParentheses']) && (($token->value === '(') || ($token->value === ')'))) {
                    // No brackets were expected.
                    break;
                }

                if ($token->value === '(') {
                    ++$brackets;
                    if (
                        empty($ret->function) && ($prev[1] !== null)
                        && (($prev[1]->type === TokenType::None)
                        || ($prev[1]->type === TokenType::Symbol)
                        || (($prev[1]->type === TokenType::Keyword)
                        && ($prev[1]->flags & Token::FLAG_KEYWORD_FUNCTION)))
                    ) {
                        $ret->function = $prev[1]->value;
                    }
                } elseif ($token->value === ')') {
                    if ($brackets === 0) {
                        // Not our bracket
                        break;
                    }

                    --$brackets;
                    if ($brackets === 0) {
                        if (! empty($options['parenthesesDelimited'])) {
                            // The current token is the last bracket, the next
                            // one will be outside the expression.
                            $ret->expr .= $token->token;
                            ++$list->idx;
                            break;
                        }
                    } elseif ($brackets < 0) {
                        // $parser->error('Unexpected closing bracket.', $token);
                        // $brackets = 0;
                        break;
                    }
                } elseif ($token->value === ',') {
                    // Expressions are comma-delimited.
                    if ($brackets === 0) {
                        break;
                    }
                }
            }

            // Saving the previous tokens.
            $prev[0] = $prev[1];
            $prev[1] = $token;

            if ($alias) {
                // An alias is expected (the keyword `AS` was previously found).
                if (! empty($ret->alias)) {
                    $parser->error('An alias was previously found.', $token);
                    break;
                }

                $ret->alias = $token->value;
                $alias = false;
            } elseif ($isExpr) {
                // Handling aliases.
                if (
                    $brackets === 0
                    && ($prev[0] === null
                        || (($prev[0]->type !== TokenType::Operator || $prev[0]->token === ')')
                            && ($prev[0]->type !== TokenType::Keyword
                                || ! ($prev[0]->flags & Token::FLAG_KEYWORD_RESERVED))))
                    && (($prev[1]->type === TokenType::String)
                        || ($prev[1]->type === TokenType::Symbol
                            && ! ($prev[1]->flags & Token::FLAG_SYMBOL_VARIABLE)
                            && ! ($prev[1]->flags & Token::FLAG_SYMBOL_PARAMETER))
                        || ($prev[1]->type === TokenType::None
                            && $prev[1]->token !== 'OVER'))
                ) {
                    if (! empty($ret->alias)) {
                        $parser->error('An alias was previously found.', $token);
                        break;
                    }

                    $ret->alias = $prev[1]->value;
                } else {
                    $currIdx = $list->idx;
                    --$list->idx;
                    $beforeToken = $list->getPrevious();
                    $list->idx = $currIdx;
                    // columns names tokens are of type NONE, or SYMBOL (`col`), and the columns options
                    // would start with a token of type KEYWORD, in that case, we want to have a space
                    // between the tokens.
                    if (
                        $ret->expr !== null &&
                        $beforeToken &&
                        ($beforeToken->type === TokenType::None ||
                        $beforeToken->type === TokenType::Symbol || $beforeToken->type === TokenType::String) &&
                        $token->type === TokenType::Keyword
                    ) {
                        $ret->expr = rtrim($ret->expr, ' ') . ' ';
                    }

                    $ret->expr .= $token->token;
                }
            } else {
                if (($token->type === TokenType::Operator) && ($token->value === '.')) {
                    // Found a `.` which means we expect a column name and
                    // the column name we parsed is actually the table name
                    // and the table name is actually a database name.
                    if (! empty($ret->database) || $dot) {
                        $parser->error('Unexpected dot.', $token);
                    }

                    $ret->database = $ret->table;
                    $ret->table = $ret->column;
                    $ret->column = null;
                    $dot = true;
                    $ret->expr .= $token->token;
                } else {
                    $field = empty($options['field']) ? 'column' : $options['field'];
                    if (empty($ret->$field)) {
                        $ret->$field = $token->value;
                        $ret->expr .= $token->token;
                        $dot = false;
                    } else {
                        // No alias is expected.
                        if (! empty($options['breakOnAlias'])) {
                            break;
                        }

                        if (! empty($ret->alias)) {
                            $parser->error('An alias was previously found.', $token);
                            break;
                        }

                        $ret->alias = $token->value;
                    }
                }
            }
        }

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

        // White-spaces might be added at the end.
        $ret->expr = trim((string) $ret->expr);

        if ($ret->expr === '') {
            return null;
        }

        --$list->idx;

        return $ret;
    }

    public function build(): string
    {
        if ($this->expr !== '' && $this->expr !== null) {
            $ret = $this->expr;
        } else {
            $fields = [];
            if (isset($this->database) && ($this->database !== '')) {
                $fields[] = $this->database;
            }

            if (isset($this->table) && ($this->table !== '')) {
                $fields[] = $this->table;
            }

            if (isset($this->column) && ($this->column !== '')) {
                $fields[] = $this->column;
            }

            $ret = implode('.', Context::escapeAll($fields));
        }

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

        return $ret;
    }

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

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


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\Exceptions\ParserException;
10		use PhpMyAdmin\SqlParser\Parser;
11		use PhpMyAdmin\SqlParser\Token;
12		use PhpMyAdmin\SqlParser\TokensList;
13		use PhpMyAdmin\SqlParser\TokenType;
14
15		use function implode;
16		use function rtrim;
17		use function strlen;
18		use function trim;
19
20		/**
21		* Parses a reference to an expression (column, table or database name, function
22		* call, mathematical expression, etc.).
23		*/
24		#[\AllowDynamicProperties]
25		final class Expression implements Component
26		{
27		/**
28		* List of allowed reserved keywords in expressions.
29		*/
30		private const ALLOWED_KEYWORDS = [
31		'AND' => 1,
32		'AS' => 1,
33		'BETWEEN' => 1,
34		'CASE' => 1,
35		'DUAL' => 1,
36		'DIV' => 1,
37		'IS' => 1,
38		'MOD' => 1,
39		'NOT' => 1,
40		'NOT NULL' => 1,
41		'NULL' => 1,
42		'OR' => 1,
43		'OVER' => 1,
44		'REGEXP' => 1,
45		'RLIKE' => 1,
46		'XOR' => 1,
47		];
48
49		/**
50		* The name of this database.
51		*
52		* @var string\|null
53		*/
54		public $database;
55
56		/**
57		* The name of this table.
58		*
59		* @var string\|null
60		*/
61		public $table;
62
63		/**
64		* The name of the column.
65		*
66		* @var string\|null
67		*/
68		public $column;
69
70		/**
71		* The sub-expression.
72		*
73		* @var string\|null
74		*/
75		public $expr = '';
76
77		/**
78		* The alias of this expression.
79		*
80		* @var string\|null
81		*/
82		public $alias;
83
84		/**
85		* The name of the function.
86		*
87		* @var mixed
88		*/
89		public $function;
90
91		/**
92		* The type of subquery.
93		*
94		* @var string\|null
95		*/
96		public $subquery;
97
98		/**
99		* Syntax:
100		* new Expression('expr')
101		* new Expression('expr', 'alias')
102		* new Expression('database', 'table', 'column')
103		* new Expression('database', 'table', 'column', 'alias')
104		*
105		* If the database, table or column name is not required, pass an empty
106		* string.
107		*
108		* @param string\|null $database The name of the database or the expression.
109		* @param string\|null $table The name of the table or the alias of the expression.
110		* @param string\|null $column the name of the column
111		* @param string\|null $alias the name of the alias
112		*/
113	1114	public function __construct($database = null, $table = null, $column = null, $alias = null)
114		{
115	1114	if (($column === null) && ($alias === null)) {
116	1114	$this->expr = $database; // case 1
117	1114	$this->alias = $table; // case 2
118		} else {
119	4	$this->database = $database; // case 3
120	4	$this->table = $table; // case 3
121	4	$this->column = $column; // case 3
122	4	$this->alias = $alias; // case 4
123		}
124		}
125
126		/**
127		* Possible options:.
128		*
129		* `field`
130		*
131		* First field to be filled.
132		* If this is not specified, it takes the value of `parseField`.
133		*
134		* `parseField`
135		*
136		* Specifies the type of the field parsed. It may be `database`,
137		* `table` or `column`. These expressions may not include
138		* parentheses.
139		*
140		* `breakOnAlias`
141		*
142		* If not empty, breaks when the alias occurs (it is not included).
143		*
144		* `breakOnParentheses`
145		*
146		* If not empty, breaks when the first parentheses occurs.
147		*
148		* `parenthesesDelimited`
149		*
150		* If not empty, breaks after last parentheses occurred.
151		*
152		* @param Parser $parser the parser that serves as context
153		* @param TokensList $list the list of tokens that are being parsed
154		* @param array<string, mixed> $options parameters for parsing
155		*
156		* @throws ParserException
157		*/
158	1104	public static function parse(Parser $parser, TokensList $list, array $options = []): Expression\|null
159		{
160	1104	$ret = new static();
161
162		/**
163		* Whether current tokens make an expression or a table reference.
164		*
165		* @var bool
166		*/
167	1104	$isExpr = false;
168
169		/**
170		* Whether a period was previously found.
171		*
172		* @var bool
173		*/
174	1104	$dot = false;
175
176		/**
177		* Whether an alias is expected. Is 2 if `AS` keyword was found.
178		*
179		* @var bool
180		*/
181	1104	$alias = false;
182
183		/**
184		* Counts brackets.
185		*
186		* @var int
187		*/
188	1104	$brackets = 0;
189
190		/**
191		* Keeps track of the last two previous tokens.
192		*
193		* @var Token[]
194		*/
195	1104	$prev = [
196	1104	null,
197	1104	null,
198	1104	];
199
200		// When a field is parsed, no parentheses are expected.
201	1104	if (! empty($options['parseField'])) {
202	636	$options['breakOnParentheses'] = true;
203	636	$options['field'] = $options['parseField'];
204		}
205
206	1104	for (; $list->idx < $list->count; ++$list->idx) {
207		/**
208		* Token parsed at this moment.
209		*/
210	1104	$token = $list->tokens[$list->idx];
211
212		// End of statement.
213	1104	if ($token->type === TokenType::Delimiter) {
214	428	break;
215		}
216
217		// Skipping whitespaces and comments.
218	1102	if (($token->type === TokenType::Whitespace) \|\| ($token->type === TokenType::Comment)) {
219		// If the token is a closing C comment from a MySQL command, it must be ignored.
220	942	if ($isExpr && $token->token !== '*/') {
221	410	$ret->expr .= $token->token;
222		}
223
224	942	continue;
225		}
226
227	1102	if ($token->type === TokenType::Keyword) {
228	860	if (($brackets > 0) && empty($ret->subquery) && ! empty(Parser::STATEMENT_PARSERS[$token->keyword])) {
229		// A `(` was previously found and this keyword is the
230		// beginning of a statement, so this is a subquery.
231	68	$ret->subquery = $token->keyword;
232		} elseif (
233	858	($token->flags & Token::FLAG_KEYWORD_FUNCTION)
234	858	&& (empty($options['parseField'])
235	858	&& ! $alias)
236		) {
237	104	$isExpr = true;
238	834	} elseif (($token->flags & Token::FLAG_KEYWORD_RESERVED) && ($brackets === 0)) {
239	772	if (empty(self::ALLOWED_KEYWORDS[$token->keyword])) {
240		// A reserved keyword that is not allowed in the
241		// expression was found so the expression must have
242		// ended and a new clause is starting.
243	724	break;
244		}
245
246	204	if ($token->keyword === 'AS') {
247	156	if (! empty($options['breakOnAlias'])) {
248	30	break;
249		}
250
251	142	if ($alias) {
252	2	$parser->error('An alias was expected.', $token);
253	2	break;
254		}
255
256	142	$alias = true;
257	142	continue;
258		}
259
260	64	if ($token->keyword === 'CASE') {
261		// For a use of CASE like
262		// 'SELECT a = CASE .... END, b=1, `id`, ... FROM ...'
263	10	$tempCaseExpr = CaseExpression::parse($parser, $list);
264	10	$ret->expr .= $tempCaseExpr->build();
265	10	$isExpr = true;
266	10	continue;
267		}
268
269	54	$isExpr = true;
270	238	} elseif ($brackets === 0 && strlen((string) $ret->expr) > 0 && ! $alias) {
271		/* End of expression */
272	164	break;
273		}
274		}
275
276		if (
277	1098	($token->type === TokenType::Number)
278	1074	\|\| ($token->type === TokenType::Bool)
279	1074	\|\| (($token->type === TokenType::Symbol)
280	1074	&& ($token->flags & Token::FLAG_SYMBOL_VARIABLE))
281	1066	\|\| (($token->type === TokenType::Symbol)
282	1066	&& ($token->flags & Token::FLAG_SYMBOL_PARAMETER))
283	1098	\|\| (($token->type === TokenType::Operator)
284	1098	&& ($token->value !== '.'))
285		) {
286	704	if (! empty($options['parseField'])) {
287	236	break;
288		}
289
290		// Numbers, booleans and operators (except dot) are usually part
291		// of expressions.
292	550	$isExpr = true;
293		}
294
295	1098	if ($token->type === TokenType::Operator) {
296	486	if (! empty($options['breakOnParentheses']) && (($token->value === '(') \|\| ($token->value === ')'))) {
297		// No brackets were expected.
298	4	break;
299		}
300
301	484	if ($token->value === '(') {
302	180	++$brackets;
303		if (
304	180	empty($ret->function) && ($prev[1] !== null)
305	180	&& (($prev[1]->type === TokenType::None)
306	180	\|\| ($prev[1]->type === TokenType::Symbol)
307	180	\|\| (($prev[1]->type === TokenType::Keyword)
308	180	&& ($prev[1]->flags & Token::FLAG_KEYWORD_FUNCTION)))
309		) {
310	118	$ret->function = $prev[1]->value;
311		}
312	482	} elseif ($token->value === ')') {
313	194	if ($brackets === 0) {
314		// Not our bracket
315	22	break;
316		}
317
318	178	--$brackets;
319	178	if ($brackets === 0) {
320	178	if (! empty($options['parenthesesDelimited'])) {
321		// The current token is the last bracket, the next
322		// one will be outside the expression.
323	50	$ret->expr .= $token->token;
324	50	++$list->idx;
325	114	break;
326		}
327	22	} elseif ($brackets < 0) {
328		// $parser->error('Unexpected closing bracket.', $token);
329		// $brackets = 0;
330	73	break;
331		}
332	430	} elseif ($token->value === ',') {
333		// Expressions are comma-delimited.
334	278	if ($brackets === 0) {
335	244	break;
336		}
337		}
338		}
339
340		// Saving the previous tokens.
341	1096	$prev[0] = $prev[1];
342	1096	$prev[1] = $token;
343
344	1096	if ($alias) {
345		// An alias is expected (the keyword `AS` was previously found).
346	140	if (! empty($ret->alias)) {
347	2	$parser->error('An alias was previously found.', $token);
348	2	break;
349		}
350
351	140	$ret->alias = $token->value;
352	140	$alias = false;
353	1096	} elseif ($isExpr) {
354		// Handling aliases.
355		if (
356	506	$brackets === 0
357	506	&& ($prev[0] === null
358	506	\|\| (($prev[0]->type !== TokenType::Operator \|\| $prev[0]->token === ')')
359	506	&& ($prev[0]->type !== TokenType::Keyword
360	506	\|\| ! ($prev[0]->flags & Token::FLAG_KEYWORD_RESERVED))))
361	506	&& (($prev[1]->type === TokenType::String)
362	506	\|\| ($prev[1]->type === TokenType::Symbol
363	506	&& ! ($prev[1]->flags & Token::FLAG_SYMBOL_VARIABLE)
364	506	&& ! ($prev[1]->flags & Token::FLAG_SYMBOL_PARAMETER))
365	506	\|\| ($prev[1]->type === TokenType::None
366	506	&& $prev[1]->token !== 'OVER'))
367		) {
368	14	if (! empty($ret->alias)) {
369	4	$parser->error('An alias was previously found.', $token);
370	4	break;
371		}
372
373	12	$ret->alias = $prev[1]->value;
374		} else {
375	506	$currIdx = $list->idx;
376	506	--$list->idx;
377	506	$beforeToken = $list->getPrevious();
378	506	$list->idx = $currIdx;
379		// columns names tokens are of type NONE, or SYMBOL (`col`), and the columns options
380		// would start with a token of type KEYWORD, in that case, we want to have a space
381		// between the tokens.
382		if (
383	506	$ret->expr !== null &&
384		$beforeToken &&
385	506	($beforeToken->type === TokenType::None \|\|
386	506	$beforeToken->type === TokenType::Symbol \|\| $beforeToken->type === TokenType::String) &&
387	506	$token->type === TokenType::Keyword
388		) {
389	76	$ret->expr = rtrim($ret->expr, ' ') . ' ';
390		}
391
392	506	$ret->expr .= $token->token;
393		}
394		} else {
395	1006	if (($token->type === TokenType::Operator) && ($token->value === '.')) {
396		// Found a `.` which means we expect a column name and
397		// the column name we parsed is actually the table name
398		// and the table name is actually a database name.
399	112	if (! empty($ret->database) \|\| $dot) {
400	4	$parser->error('Unexpected dot.', $token);
401		}
402
403	112	$ret->database = $ret->table;
404	112	$ret->table = $ret->column;
405	112	$ret->column = null;
406	112	$dot = true;
407	112	$ret->expr .= $token->token;
408		} else {
409	1006	$field = empty($options['field']) ? 'column' : $options['field'];
410	1006	if (empty($ret->$field)) {
411	1006	$ret->$field = $token->value;
412	1006	$ret->expr .= $token->token;
413	1006	$dot = false;
414		} else {
415		// No alias is expected.
416	78	if (! empty($options['breakOnAlias'])) {
417	24	break;
418		}
419
420	54	if (! empty($ret->alias)) {
421	8	$parser->error('An alias was previously found.', $token);
422	8	break;
423		}
424
425	50	$ret->alias = $token->value;
426		}
427		}
428		}
429		}
430
431	1104	if ($alias) {
432	6	$parser->error('An alias was expected.', $list->tokens[$list->idx - 1]);
433		}
434
435		// White-spaces might be added at the end.
436	1104	$ret->expr = trim((string) $ret->expr);
437
438	1104	if ($ret->expr === '') {
439	58	return null;
440		}
441
442	1096	--$list->idx;
443
444	1096	return $ret;
445		}
446
447	260	public function build(): string
448		{
449	260	if ($this->expr !== '' && $this->expr !== null) {
450	242	$ret = $this->expr;
451		} else {
452	22	$fields = [];
453	22	if (isset($this->database) && ($this->database !== '')) {
454	2	$fields[] = $this->database;
455		}
456
457	22	if (isset($this->table) && ($this->table !== '')) {
458	22	$fields[] = $this->table;
459		}
460
461	22	if (isset($this->column) && ($this->column !== '')) {
462	2	$fields[] = $this->column;
463		}
464
465	22	$ret = implode('.', Context::escapeAll($fields));
466		}
467
468	260	if (! empty($this->alias)) {
469	32	$ret .= ' AS ' . Context::escape($this->alias);
470		}
471
472	260	return $ret;
473		}
474
475		/**
476		* @param Expression[] $component the component to be built
477		*/
478	14	public static function buildAll(array $component): string
479		{
480	14	return implode(', ', $component);
481		}
482
483	226	public function __toString(): string
484		{
485	226	return $this->build();
486		}
487		}
488

phpmyadmin / sql-parser

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