TinyMathExpression

A simple math expression evaluator. Expressions are parsed and transformed into postfix notation when calling the constructor. Evaluating the expressions does not allocate any garbage and should be reasonably performant.

Installation

You can install this package via the Unity Package Manager "Add package from git URL" option by using this URL: https://github.com/JanikHelbig/TinyMathExpression.git?path=Assets/TinyMathExpression or add "com.jnk.tinymathexpression" : "https://github.com/JanikHelbig/TinyMathExpression.git?path=Assets/TinyMathExpression" to your Packages/manifest.json.

Use the #*.*.* postfix to use a specific release of the package, e.g. https://github.com/JanikHelbig/TinyMathExpression.git?path=Assets/TinyMathExpression#1.0.0.

Usage

// Create a new MathExpression
var expression = new MathExpression("round(240 * 1.1 ^ {0})");

// Evaluate the expression
double result = expression.Evaluate(3.0);

The number of arguments passed to Evaluate() has to match the number of parameters in the expression.

Syntax

The following syntax is supported:

// Parameters
"2 + {0}" // [{0}, {1}, ..., {9}]

// Operators
"3 + 2"
"3 - 2"
"3 * 2"
"3 / 2"
"3 ^ 2"

// Parenthesis
"(2 + 3) * 2"

// Functions
"round(1.3)"
"floor(1.3)"
"ceil(1.3)"
"sqrt(4)"
"log(4)"
"sin(1)"
"cos(1)"

// Constants
"2 * PI" // Equivalent to Math.PI
"2 * E"  // Equivalent to Math.E

Spaces are not required.