Parser

Contents

Parser#

Arokettu\ArithmeticParser\Parser class is used to parse an arithmetic expression to the Reverse Polish notation by the shunting yard algorithm.

Parser API is not considered stable.

parse()#

parse method returns an array of operation objects for RPN stack machine. Example:

<?php

use Arokettu\ArithmeticParser\Operation\BinaryOperator;
use Arokettu\ArithmeticParser\Operation\Number;
use Arokettu\ArithmeticParser\Operation\Variable;
use Arokettu\ArithmeticParser\Parser;

$parser = new Parser();

$rpn = $parser->parse('x + 3 * y'); // rpn is x 3 y * +

$rpn->operations == [
    new Variable('x'),
    new Number(3),
    new Variable('y'),
    new BinaryOperator('*'),
    new BinaryOperator('+'),
]; // true

var_dump($rpn->asString()); // "x 3 y * +"
Contents