Tokenizer::emptyStringBufferAsVariable() - Code Metrics - platine-php/expression - Measure and Improve Code Quality continuously with Scrutinizer

Tokenizer::emptyStringBufferAsVariable() A
last analyzed 2025-05-19 09:22 UTC

↳ Parent: Tokenizer

Complexity

Conditions	2
Paths	2

Size

Total Lines	5
Code Lines	3

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
eloc	3
c	1
b	0
f	0
dl	0
loc	5
rs	10
cc	2
nc	2
nop	0

<?php

/**
 * Platine Expression
 *
 * Platine Expression is an expression parser, evaluator with support of custom
 * operators and functions
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2020 Platine Expression
 * Copyright (c) Alexander Kiryukhin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/**
 * @file Tokenizer.php
 *
 * The Tokenizer class
 *
 *  @package    Platine\Expression
 *  @author Platine Developers Team
 *  @copyright  Copyright (c) 2020
 *  @license    http://opensource.org/licenses/MIT  MIT License
 *  @link   https://www.platine-php.com
 *  @version 1.0.0
 *  @filesource
 */
declare(strict_types=1);

namespace Platine\Expression;

use Platine\Expression\Exception\IncorrectBracketsException;
use Platine\Expression\Exception\UnknownOperatorException;
use RuntimeException;
use SplStack;

/**
 * @class Tokenizer
 * @package Platine\Expression
 */
class Tokenizer
{
    /**
     * List of token
     * @var Token[]
     */
    protected array $tokens = [];

    /**
     * The expression to evaluate
     * @var string
     */
    protected string $input = '';

    /**
     * The number buffering
     * @var string
     */
    protected string $numberBuffer = '';

    /**
     * The string buffering
     * @var string
     */
    protected string $stringBuffer = '';

    /**
     * Whether to allow negative or not
     * @var bool
     */
    protected bool $allowNegative = true;

    /**
     * The list of operator
     * @var array<string, Operator>
     */
    protected array $operators = [];

    /**
     * Whether the current pointer is inside single quoted string
     * @var bool
     */
    protected bool $inSingleQuotedString = false;

    /**
     * Whether the current pointer is inside double quoted string
     * @var bool
     */
    protected bool $inDoubleQuotedString = false;

    /**
     * Create new instance
     * @param string $input
     * @param array<string, Operator> $operators
     */
    public function __construct(string $input, array $operators)
    {
        $this->input = $input;
        $this->operators = $operators;
    }

    /**
     * Produce the tokens
     * @return $this
     */
    public function tokenize(): self
    {
        $isLastCharEscape = false;
        foreach (str_split($this->input) as $ch) {
            switch (true) {
                case $this->inSingleQuotedString:
                    if ($ch === '\\') {
                        if ($isLastCharEscape) {
                            $this->stringBuffer .= '\\';
                            $isLastCharEscape = false;
                        } else {
                            $isLastCharEscape = true;
                        }

                        continue 2;
                    } elseif ($ch === "'") {
                        if ($isLastCharEscape) {
                            $this->stringBuffer .= "'";
                            $isLastCharEscape = false;
                        } else {
                            $this->tokens[] = new Token(Token::STRING, $this->stringBuffer);
                            $this->inSingleQuotedString = false;
                            $this->stringBuffer = '';
                        }

                        continue 2;
                    }

                    if ($isLastCharEscape) {
                        $this->stringBuffer .= '\\';
                        $isLastCharEscape = false;
                    }

                    $this->stringBuffer .= $ch;

                    continue 2;

                case $this->inDoubleQuotedString:
                    if ($ch === '\\') {
                        if ($isLastCharEscape) {
                            $this->stringBuffer .= '\\';
                            $isLastCharEscape = false;
                        } else {
                            $isLastCharEscape = true;
                        }

                        continue 2;
                    } elseif ($ch === '"') {
                        if ($isLastCharEscape) {
                            $this->stringBuffer .= '"';
                            $isLastCharEscape = false;
                        } else {
                            $this->tokens[] = new Token(Token::STRING, $this->stringBuffer);
                            $this->inDoubleQuotedString = false;
                            $this->stringBuffer = '';
                        }

                        continue 2;
                    }

                    if ($isLastCharEscape) {
                        $this->stringBuffer .= '\\';
                        $isLastCharEscape = false;
                    }

                    $this->stringBuffer .= $ch;

                    continue 2;

                case $ch === '[':
                    $this->tokens[] = new Token(Token::FUNCTION, 'array');
                    $this->allowNegative = true;
                    $this->tokens[] = new Token(Token::LEFT_PARENTHESIS, '');

                    continue 2;

                case $ch == ' ' || $ch == "\n" || $ch == "\r" || $ch == "\t":
                    $this->emptyNumberBufferAsLiteral();
                    $this->emptyStringBufferAsVariable();
                    $this->tokens[] = new Token(Token::SPACE, '');
                    continue 2;

                case $this->isNumber($ch):
                    if ($this->stringBuffer != '') {
                        $this->stringBuffer .= $ch;

                        continue 2;
                    }
                    $this->numberBuffer .= $ch;
                    $this->allowNegative = false;
                    break;

                case strtolower($ch) === 'e':
                    if (strlen($this->numberBuffer) > 0 && strpos($this->numberBuffer, '.') !== false) {
                        $this->numberBuffer .= 'e';
                        $this->allowNegative = false;

                        break;
                    }
                // no break
                // Intentionally fall through
                case $this->isAlpha($ch):
                    if (strlen($this->numberBuffer) > 0) {
                        $this->emptyNumberBufferAsLiteral();
                        $this->tokens[] = new Token(Token::OPERATOR, '*');
                    }
                    $this->allowNegative = false;
                    $this->stringBuffer .= $ch;

                    break;

                case $ch === '"':
                    $this->inDoubleQuotedString = true;

                    continue 2;

                case $ch === "'":
                    $this->inSingleQuotedString = true;

                    continue 2;

                case $this->isDot($ch):
                    $this->numberBuffer .= $ch;
                    $this->allowNegative = false;

                    break;

                case $this->isLeftParenthesis($ch):
                    if ($this->stringBuffer != '') {
                        $this->tokens[] = new Token(Token::FUNCTION, $this->stringBuffer);
                        $this->stringBuffer = '';
                    } elseif (strlen($this->numberBuffer) > 0) {
                        $this->emptyNumberBufferAsLiteral();
                        $this->tokens[] = new Token(Token::OPERATOR, '*');
                    }
                    $this->allowNegative = true;
                    $this->tokens[] = new Token(Token::LEFT_PARENTHESIS, '');

                    break;

                case $this->isRightParenthesis($ch) || $ch === ']':
                    $this->emptyNumberBufferAsLiteral();
                    $this->emptyStringBufferAsVariable();
                    $this->allowNegative = false;
                    $this->tokens[] = new Token(Token::RIGHT_PARENTHESIS, '');

                    break;

                case $this->isComma($ch):
                    $this->emptyNumberBufferAsLiteral();
                    $this->emptyStringBufferAsVariable();
                    $this->allowNegative = true;
                    $this->tokens[] = new Token(Token::PARAM_SEPARATOR, '');

                    break;

                default:
                    // special case for unary operations
                    if ($ch == '-' || $ch == '+') {
                        if ($this->allowNegative) {
                            $this->allowNegative = false;
                            $this->tokens[] = new Token(Token::OPERATOR, $ch == '-' ? 'uNeg' : 'uPos');

                            continue 2;
                        }
                        // could be in exponent, in which case negative
                        // should be added to the number buffer
                        if ($this->numberBuffer && 'e' == $this->numberBuffer[strlen($this->numberBuffer) - 1]) {
                            $this->numberBuffer .= $ch;

                            continue 2;
                        }
                    }
                    $this->emptyNumberBufferAsLiteral();
                    $this->emptyStringBufferAsVariable();

                    if ($ch !== '$') {
                        if (count($this->tokens) > 0) {
                            if (Token::OPERATOR === $this->tokens[count($this->tokens) - 1]->getType()) {
                                $token = $this->tokens[count($this->tokens) - 1];
                                $this->tokens[count($this->tokens) - 1]
                                        ->setValue($token->getValue() . $ch);
                            } else {
                                $this->tokens[] = new Token(Token::OPERATOR, $ch);
                            }
                        } else {
                            $this->tokens[] = new Token(Token::OPERATOR, $ch);
                        }
                    }
                    $this->allowNegative = true;
            }
        }
        $this->emptyNumberBufferAsLiteral();
        $this->emptyStringBufferAsVariable();

        return $this;
    }

    /**
     * Build the reverse polish notation
     * @return Token[]
     */
    public function buildReversePolishNotation(): array
    {
        $tokens  = [];
        /** @var SplStack<Token> $stack */
        $stack = new SplStack();

        /** @var SplStack<int> $paramCounter */
        $paramCounter = new SplStack();
        foreach ($this->tokens as $token) {
            switch ($token->getType()) {
                case Token::LITERAL:
                case Token::VARIABLE:
                case Token::STRING:
                    $tokens[] = $token;

                    if ($paramCounter->count() > 0 && $paramCounter->top() === 0) {
                        $paramCounter->push($paramCounter->pop() + 1);
                    }

                    break;

                case Token::FUNCTION:
                    if ($paramCounter->count() > 0 && $paramCounter->top() === 0) {
                        $paramCounter->push($paramCounter->pop() + 1);
                    }
                    $stack->push($token);
                    $paramCounter->push(0);

                    break;

                case Token::LEFT_PARENTHESIS:
                    $stack->push($token);

                    break;

                case Token::PARAM_SEPARATOR:
                    while (Token::LEFT_PARENTHESIS !== $stack->top()->getType()) {
                        if ($stack->count() === 0) {
                            throw new IncorrectBracketsException('Incorrect brackets');
                        }
                        $tokens[] = $stack->pop();
                    }

                    $paramCounter->push($paramCounter->pop() + 1);
                    break;

                case Token::OPERATOR:
                    if (!array_key_exists($token->getValue(), $this->operators)) {
                        throw new UnknownOperatorException(sprintf(
                            'Unknown operator [%s]',
                            $token->getValue()
                        ));
                    }
                    $op1 = $this->operators[$token->getValue()];
                    while ($stack->count() > 0 && Token::OPERATOR === $stack->top()->getType()) {
                        if (!array_key_exists($stack->top()->getValue(), $this->operators)) {
                            throw new UnknownOperatorException(sprintf(
                                'Unknown operator [%s]',
                                $stack->top()->getValue()
                            ));
                        }
                        $op2 = $this->operators[$stack->top()->getValue()];
                        if ($op2->getPriority() >= $op1->getPriority()) {
                            $tokens[] = $stack->pop();

                            continue;
                        }

                        break;
                    }
                    $stack->push($token);
                    break;

                case Token::RIGHT_PARENTHESIS:
                    while (true) {
                        try {
                            $ctoken = $stack->pop();
                            if (Token::LEFT_PARENTHESIS === $ctoken->getType()) {
                                break;
                            }
                            $tokens[] = $ctoken;
                        } catch (RuntimeException $ex) {
                            throw new IncorrectBracketsException('Incorrect brackets');
                        }
                    }
                    if ($stack->count() > 0 && Token::FUNCTION === $stack->top()->getType()) {
                        /** @var Token $funcToken */
                        $funcToken = $stack->pop();
                        $funcToken->setParamCount($paramCounter->pop());
                        $tokens[] = $funcToken;
                    }
                    break;
                case Token::SPACE:
                    // do nothing
            }
        }

        while ($stack->count() !== 0) {
            if (
                in_array(
                    $stack->top()->getType(),
                    [Token::LEFT_PARENTHESIS, Token::RIGHT_PARENTHESIS]
                )
            ) {
                throw new IncorrectBracketsException('Incorrect brackets');
            }

            if (Token::SPACE === $stack->top()->getType()) {
                $stack->pop();

                continue;
            }
            $tokens[] = $stack->pop();
        }

        return $tokens;
    }

    /**
     * Put the current number buffer content to token
     * as literal
     * @return void
     */
    protected function emptyNumberBufferAsLiteral(): void
    {
        if (strlen($this->numberBuffer) > 0) {
            $this->tokens[] = new Token(Token::LITERAL, $this->numberBuffer);
            $this->numberBuffer = '';
        }
    }

    /**
     * Put the current string buffer content to token
     * as variable
     * @return void
     */
    protected function emptyStringBufferAsVariable(): void
    {
        if (strlen($this->stringBuffer) > 0) {
            $this->tokens[] = new Token(Token::VARIABLE, $this->stringBuffer);
            $this->stringBuffer = '';
        }
    }

    /**
     * Whether the give argument is number
     * @param string $chr
     * @return bool
     */
    protected function isNumber(string $chr): bool
    {
        return $chr >= '0' && $chr <= '9';
    }

    /**
     * Whether the give argument is alphabetic
     * @param string $chr
     * @return bool
     */
    protected function isAlpha(string $chr): bool
    {
        return $chr >= 'a' && $chr <= 'z' || $chr >= 'A' && $chr <= 'Z' || $chr === '_';
    }

    /**
     * Whether the give argument is dot
     * @param string $chr
     * @return bool
     */
    protected function isDot(string $chr): bool
    {
        return $chr === '.';
    }

    /**
     * Whether the give argument is left parenthesis
     * @param string $chr
     * @return bool
     */
    protected function isLeftParenthesis(string $chr): bool
    {
        return $chr === '(';
    }

    /**
     * Whether the give argument is right parenthesis
     * @param string $chr
     * @return bool
     */
    protected function isRightParenthesis(string $chr): bool
    {
        return $chr === ')';
    }

    /**
     * Whether the give argument is comma
     * @param string $chr
     * @return bool
     */
    protected function isComma(string $chr): bool
    {
        return $chr === ',';
    }
}


1			<?php
2
3			/**
4			* Platine Expression
5			*
6			* Platine Expression is an expression parser, evaluator with support of custom
7			* operators and functions
8			*
9			* This content is released under the MIT License (MIT)
10			*
11			* Copyright (c) 2020 Platine Expression
12			* Copyright (c) Alexander Kiryukhin
13			*
14			* Permission is hereby granted, free of charge, to any person obtaining a copy
15			* of this software and associated documentation files (the "Software"), to deal
16			* in the Software without restriction, including without limitation the rights
17			* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18			* copies of the Software, and to permit persons to whom the Software is
19			* furnished to do so, subject to the following conditions:
20			*
21			* The above copyright notice and this permission notice shall be included in all
22			* copies or substantial portions of the Software.
23			*
24			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25			* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26			* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27			* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28			* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29			* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30			* SOFTWARE.
31			*/
32
33			/**
34			* @file Tokenizer.php
35			*
36			* The Tokenizer class
37			*
38			* @package Platine\Expression
39			* @author Platine Developers Team
40			* @copyright Copyright (c) 2020
41			* @license http://opensource.org/licenses/MIT MIT License
42			* @link https://www.platine-php.com
43			* @version 1.0.0
44			* @filesource
45			*/
46			declare(strict_types=1);
47
48			namespace Platine\Expression;
49
50			use Platine\Expression\Exception\IncorrectBracketsException;
51			use Platine\Expression\Exception\UnknownOperatorException;
52			use RuntimeException;
53			use SplStack;
54
55			/**
56			* @class Tokenizer
57			* @package Platine\Expression
58			*/
59			class Tokenizer
60			{
61			/**
62			* List of token
63			* @var Token[]
64			*/
65			protected array $tokens = [];
66
67			/**
68			* The expression to evaluate
69			* @var string
70			*/
71			protected string $input = '';
72
73			/**
74			* The number buffering
75			* @var string
76			*/
77			protected string $numberBuffer = '';
78
79			/**
80			* The string buffering
81			* @var string
82			*/
83			protected string $stringBuffer = '';
84
85			/**
86			* Whether to allow negative or not
87			* @var bool
88			*/
89			protected bool $allowNegative = true;
90
91			/**
92			* The list of operator
93			* @var array<string, Operator>
94			*/
95			protected array $operators = [];
96
97			/**
98			* Whether the current pointer is inside single quoted string
99			* @var bool
100			*/
101			protected bool $inSingleQuotedString = false;
102
103			/**
104			* Whether the current pointer is inside double quoted string
105			* @var bool
106			*/
107			protected bool $inDoubleQuotedString = false;
108
109			/**
110			* Create new instance
111			* @param string $input
112			* @param array<string, Operator> $operators
113			*/
114			public function __construct(string $input, array $operators)
115			{
116			$this->input = $input;
117			$this->operators = $operators;
118			}
119
120			/**
121			* Produce the tokens
122			* @return $this
123			*/
124			public function tokenize(): self
125			{
126			$isLastCharEscape = false;
127			foreach (str_split($this->input) as $ch) {
128			switch (true) {
129			case $this->inSingleQuotedString:
130			if ($ch === '\\') {
131			if ($isLastCharEscape) {
132			$this->stringBuffer .= '\\';
133			$isLastCharEscape = false;
134			} else {
135			$isLastCharEscape = true;
136			}
137
138			continue 2;
139			} elseif ($ch === "'") {
140			if ($isLastCharEscape) {
141			$this->stringBuffer .= "'";
142			$isLastCharEscape = false;
143			} else {
144			$this->tokens[] = new Token(Token::STRING, $this->stringBuffer);
145			$this->inSingleQuotedString = false;
146			$this->stringBuffer = '';
147			}
148
149			continue 2;
150			}
151
152			if ($isLastCharEscape) {
153			$this->stringBuffer .= '\\';
154			$isLastCharEscape = false;
155			}
156
157			$this->stringBuffer .= $ch;
158
159			continue 2;
160
161			case $this->inDoubleQuotedString:
162			if ($ch === '\\') {
163			if ($isLastCharEscape) {
164			$this->stringBuffer .= '\\';
165			$isLastCharEscape = false;
166			} else {
167			$isLastCharEscape = true;
168			}
169
170			continue 2;
171			} elseif ($ch === '"') {
172			if ($isLastCharEscape) {
173			$this->stringBuffer .= '"';
174			$isLastCharEscape = false;
175			} else {
176			$this->tokens[] = new Token(Token::STRING, $this->stringBuffer);
177			$this->inDoubleQuotedString = false;
178			$this->stringBuffer = '';
179			}
180
181			continue 2;
182			}
183
184			if ($isLastCharEscape) {
185			$this->stringBuffer .= '\\';
186			$isLastCharEscape = false;
187			}
188
189			$this->stringBuffer .= $ch;
190
191			continue 2;
192
193			case $ch === '[':
194			$this->tokens[] = new Token(Token::FUNCTION, 'array');
195			$this->allowNegative = true;
196			$this->tokens[] = new Token(Token::LEFT_PARENTHESIS, '');
197
198			continue 2;
199
200			case $ch == ' ' \|\| $ch == "\n" \|\| $ch == "\r" \|\| $ch == "\t":
201			$this->emptyNumberBufferAsLiteral();
202			$this->emptyStringBufferAsVariable();
203			$this->tokens[] = new Token(Token::SPACE, '');
204			continue 2;
205
206			case $this->isNumber($ch):
207			if ($this->stringBuffer != '') {
208			$this->stringBuffer .= $ch;
209
210			continue 2;
211			}
212			$this->numberBuffer .= $ch;
213			$this->allowNegative = false;
214			break;
215
216			case strtolower($ch) === 'e':
217			if (strlen($this->numberBuffer) > 0 && strpos($this->numberBuffer, '.') !== false) {
218			$this->numberBuffer .= 'e';
219			$this->allowNegative = false;
220
221			break;
222			}
223			// no break
224			// Intentionally fall through
225			case $this->isAlpha($ch):
226			if (strlen($this->numberBuffer) > 0) {
227			$this->emptyNumberBufferAsLiteral();
228			$this->tokens[] = new Token(Token::OPERATOR, '*');
229			}
230			$this->allowNegative = false;
231			$this->stringBuffer .= $ch;
232
233			break;
234
235			case $ch === '"':
236			$this->inDoubleQuotedString = true;
237
238			continue 2;
239
240			case $ch === "'":
241			$this->inSingleQuotedString = true;
242
243			continue 2;
244
245			case $this->isDot($ch):
246			$this->numberBuffer .= $ch;
247			$this->allowNegative = false;
248
249			break;
250
251			case $this->isLeftParenthesis($ch):
252			if ($this->stringBuffer != '') {
253			$this->tokens[] = new Token(Token::FUNCTION, $this->stringBuffer);
254			$this->stringBuffer = '';
255			} elseif (strlen($this->numberBuffer) > 0) {
256			$this->emptyNumberBufferAsLiteral();
257			$this->tokens[] = new Token(Token::OPERATOR, '*');
258			}
259			$this->allowNegative = true;
260			$this->tokens[] = new Token(Token::LEFT_PARENTHESIS, '');
261
262			break;
263
264			case $this->isRightParenthesis($ch) \|\| $ch === ']':
265			$this->emptyNumberBufferAsLiteral();
266			$this->emptyStringBufferAsVariable();
267			$this->allowNegative = false;
268			$this->tokens[] = new Token(Token::RIGHT_PARENTHESIS, '');
269
270			break;
271
272			case $this->isComma($ch):
273			$this->emptyNumberBufferAsLiteral();
274			$this->emptyStringBufferAsVariable();
275			$this->allowNegative = true;
276			$this->tokens[] = new Token(Token::PARAM_SEPARATOR, '');
277
278			break;
279
280			default:
281			// special case for unary operations
282			if ($ch == '-' \|\| $ch == '+') {
283			if ($this->allowNegative) {
284			$this->allowNegative = false;
285			$this->tokens[] = new Token(Token::OPERATOR, $ch == '-' ? 'uNeg' : 'uPos');
286
287			continue 2;
288			}
289			// could be in exponent, in which case negative
290			// should be added to the number buffer
291			if ($this->numberBuffer && 'e' == $this->numberBuffer[strlen($this->numberBuffer) - 1]) {
292			$this->numberBuffer .= $ch;
293
294			continue 2;
295			}
296			}
297			$this->emptyNumberBufferAsLiteral();
298			$this->emptyStringBufferAsVariable();
299
300			if ($ch !== '$') {
301			if (count($this->tokens) > 0) {
302			if (Token::OPERATOR === $this->tokens[count($this->tokens) - 1]->getType()) {
303			$token = $this->tokens[count($this->tokens) - 1];
304			$this->tokens[count($this->tokens) - 1]
305			->setValue($token->getValue() . $ch);
306			} else {
307			$this->tokens[] = new Token(Token::OPERATOR, $ch);
308			}
309			} else {
310			$this->tokens[] = new Token(Token::OPERATOR, $ch);
311			}
312			}
313			$this->allowNegative = true;
314			}
315			}
316			$this->emptyNumberBufferAsLiteral();
317			$this->emptyStringBufferAsVariable();
318
319			return $this;
320			}
321
322			/**
323			* Build the reverse polish notation
324			* @return Token[]
325			*/
326			public function buildReversePolishNotation(): array
327			{
328			$tokens = [];
329			/** @var SplStack<Token> $stack */
330			$stack = new SplStack();
331
332			/** @var SplStack<int> $paramCounter */
333			$paramCounter = new SplStack();
334			foreach ($this->tokens as $token) {
335			switch ($token->getType()) {
336			case Token::LITERAL:
337			case Token::VARIABLE:
338			case Token::STRING:
339			$tokens[] = $token;
340
341			if ($paramCounter->count() > 0 && $paramCounter->top() === 0) {
342			$paramCounter->push($paramCounter->pop() + 1);
343			}
344
345			break;
346
347			case Token::FUNCTION:
348			if ($paramCounter->count() > 0 && $paramCounter->top() === 0) {
349			$paramCounter->push($paramCounter->pop() + 1);
350			}
351			$stack->push($token);
352			$paramCounter->push(0);
353
354			break;
355
356			case Token::LEFT_PARENTHESIS:
357			$stack->push($token);
358
359			break;
360
361			case Token::PARAM_SEPARATOR:
362			while (Token::LEFT_PARENTHESIS !== $stack->top()->getType()) {
363			if ($stack->count() === 0) {
364			throw new IncorrectBracketsException('Incorrect brackets');
365			}
366			$tokens[] = $stack->pop();
367			}
368
369			$paramCounter->push($paramCounter->pop() + 1);
370			break;
371
372			case Token::OPERATOR:
373			if (!array_key_exists($token->getValue(), $this->operators)) {
374			throw new UnknownOperatorException(sprintf(
375			'Unknown operator [%s]',
376			$token->getValue()
377			));
378			}
379			$op1 = $this->operators[$token->getValue()];
380			while ($stack->count() > 0 && Token::OPERATOR === $stack->top()->getType()) {
381			if (!array_key_exists($stack->top()->getValue(), $this->operators)) {
382			throw new UnknownOperatorException(sprintf(
383			'Unknown operator [%s]',
384			$stack->top()->getValue()
385			));
386			}
387			$op2 = $this->operators[$stack->top()->getValue()];
388			if ($op2->getPriority() >= $op1->getPriority()) {
389			$tokens[] = $stack->pop();
390
391			continue;
392			}
393
394			break;
395			}
396			$stack->push($token);
397			break;
398
399			case Token::RIGHT_PARENTHESIS:
400			while (true) {
401			try {
402			$ctoken = $stack->pop();
403			if (Token::LEFT_PARENTHESIS === $ctoken->getType()) {
404			break;
405			}
406			$tokens[] = $ctoken;
407			} catch (RuntimeException $ex) {
408			throw new IncorrectBracketsException('Incorrect brackets');
409			}
410			}
411			if ($stack->count() > 0 && Token::FUNCTION === $stack->top()->getType()) {
412			/** @var Token $funcToken */
413			$funcToken = $stack->pop();
414			$funcToken->setParamCount($paramCounter->pop());
415			$tokens[] = $funcToken;
416			}
417			break;
418			case Token::SPACE:
419			// do nothing
420			}
421			}
422
423			while ($stack->count() !== 0) {
424			if (
425			in_array(
426			$stack->top()->getType(),
427			[Token::LEFT_PARENTHESIS, Token::RIGHT_PARENTHESIS]
428			)
429			) {
430			throw new IncorrectBracketsException('Incorrect brackets');
431			}
432
433			if (Token::SPACE === $stack->top()->getType()) {
434			$stack->pop();
435
436			continue;
437			}
438			$tokens[] = $stack->pop();
439			}
440
441			return $tokens;
442			}
443
444			/**
445			* Put the current number buffer content to token
446			* as literal
447			* @return void
448			*/
449			protected function emptyNumberBufferAsLiteral(): void
450			{
451			if (strlen($this->numberBuffer) > 0) {
452			$this->tokens[] = new Token(Token::LITERAL, $this->numberBuffer);
453			$this->numberBuffer = '';
454			}
455			}
456
457			/**
458			* Put the current string buffer content to token
459			* as variable
460			* @return void
461			*/
462			protected function emptyStringBufferAsVariable(): void
463			{
464			if (strlen($this->stringBuffer) > 0) {
465			$this->tokens[] = new Token(Token::VARIABLE, $this->stringBuffer);
466			$this->stringBuffer = '';
467			}
468			}
469
470			/**
471			* Whether the give argument is number
472			* @param string $chr
473			* @return bool
474			*/
475			protected function isNumber(string $chr): bool
476			{
477			return $chr >= '0' && $chr <= '9';
478			}
479
480			/**
481			* Whether the give argument is alphabetic
482			* @param string $chr
483			* @return bool
484			*/
485			protected function isAlpha(string $chr): bool
486			{
487			return $chr >= 'a' && $chr <= 'z' \|\| $chr >= 'A' && $chr <= 'Z' \|\| $chr === '_';
488			}
489
490			/**
491			* Whether the give argument is dot
492			* @param string $chr
493			* @return bool
494			*/
495			protected function isDot(string $chr): bool
496			{
497			return $chr === '.';
498			}
499
500			/**
501			* Whether the give argument is left parenthesis
502			* @param string $chr
503			* @return bool
504			*/
505			protected function isLeftParenthesis(string $chr): bool
506			{
507			return $chr === '(';
508			}
509
510			/**
511			* Whether the give argument is right parenthesis
512			* @param string $chr
513			* @return bool
514			*/
515			protected function isRightParenthesis(string $chr): bool
516			{
517			return $chr === ')';
518			}
519
520			/**
521			* Whether the give argument is comma
522			* @param string $chr
523			* @return bool
524			*/
525			protected function isComma(string $chr): bool
526			{
527			return $chr === ',';
528			}
529			}
530

platine-php / expression

Tokenizer::emptyStringBufferAsVariable() A last analyzed 2025-05-19 09:22 UTC

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Tokenizer::emptyStringBufferAsVariable() A
last analyzed 2025-05-19 09:22 UTC