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86 lines
2.8 KiB
PHP
Executable File
86 lines
2.8 KiB
PHP
Executable File
<?php
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/**
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* This file is part of the MathExecutor package
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*
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* (c) Alexander Kiryukhin
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code
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*/
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namespace NXP\Classes;
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use NXP\Exception\IncorrectExpressionException;
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use NXP\Exception\UnknownFunctionException;
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use NXP\Exception\UnknownOperatorException;
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use NXP\Exception\UnknownVariableException;
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/**
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* @author Alexander Kiryukhin <a.kiryukhin@mail.ru>
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*/
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class Calculator
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{
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/**
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* @todo PHP8: Use constructor property promotion -> public function __construct(private array $functions, private array $operators)
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*
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* @param array<string, CustomFunction> $functions
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* @param array<Operator> $operators
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*/
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public function __construct(private array $functions, private array $operators)
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{
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}
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/**
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* Calculate array of tokens in reverse polish notation
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*
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* @param Token[] $tokens
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* @param array<string, float|string> $variables
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*
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* @throws UnknownVariableException
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* @throws IncorrectExpressionException
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* @return int|float|string|null
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*/
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public function calculate(array $tokens, array $variables, ?callable $onVarNotFound = null)
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{
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/** @var Token[] $stack */
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$stack = [];
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foreach ($tokens as $token) {
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if (Token::Literal === $token->type || Token::String === $token->type) {
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$stack[] = $token;
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} elseif (Token::Variable === $token->type) {
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$variable = $token->value;
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$value = null;
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if (\array_key_exists($variable, $variables)) {
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$value = $variables[$variable];
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} elseif ($onVarNotFound) {
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$value = \call_user_func($onVarNotFound, $variable);
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} else {
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throw new UnknownVariableException($variable);
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}
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$stack[] = new Token(Token::Literal, $value, $variable);
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} elseif (Token::Function === $token->type) {
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if (! \array_key_exists($token->value, $this->functions)) {
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throw new UnknownFunctionException($token->value);
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}
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$stack[] = $this->functions[$token->value]->execute($stack, $token->paramCount);
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} elseif (Token::Operator === $token->type) {
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if (! \array_key_exists($token->value, $this->operators)) {
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throw new UnknownOperatorException($token->value);
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}
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$stack[] = $this->operators[$token->value]->execute($stack);
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}
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}
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$result = \array_pop($stack);
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if (null === $result || ! empty($stack)) {
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throw new IncorrectExpressionException('Stack must be empty');
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}
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return $result->value;
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}
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}
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