josefelipetto/math-expression-parser

A component to parse all kind of numerical expressions and solve them

dev-master 2020-04-09 00:22 UTC

Requires

• php: ^7.1

Requires (Dev)

• phpunit/phpunit: ^9.1

MIT

• José Henrique Medeiros Felipetto

• parser
• math
• expression

README

A Math expression parser built in PHP.

Requirements

• PHP 7.1

Installation

You can install the component by using composer.

composer require josefelipetto/math-expression-parser

How to use

You can use in two ways:

• Using the ExpressionParser facade that already mount the dependecies of the Evaluator class and returns the result, like this:

use Parser\Facades\ExpressionParser;

$result = ExpressionParser::parse('(2+2)^(2*2)/1+3+5');

assert($result === 264); 

• Or you can actually use you own implementation of a Lexer and/or AST by providing the dependencies to the classes, like this:

use Parser\Evaluator;
use Parser\Lexer; // Or your Lexer
use Parser\Syntactic; // Or your AST

$evaluator = new Evaluator(new Syntactic(new Lexer('(2+2)^(2*2)/1+3+5')));
    
assert($evaluator->parse() === 264);

Grammar

The parser accepts the following operators: + ; - ; . ; * ; / ; ^ ; ( ; )