math-expression-parser

A scala library for parsing mathemitical expressions with support for parentheses and variables.

features:

• math operators: +, -, *, /, **(power)
• parentheses ( ) and comma ,
• all function of scala.math, except of random, E and PI
• variable name: $ with valid Java variable name

Install

1. maven

   <dependency>
     <groupId>io.github.facaiy</groupId>
     <artifactId>math-expression-parser</artifactId>
     <version>0.0.2</version>
   </dependency>
   

Usage

A simple example:

import io.github.facaiy.math.expression.MathExp

val str = "1.0 + sqrt(2 * $a1) + $a2 ** 2"
val ex = MathExp.parse(str)

val variables = Map("a1" -> 2, "a2" -> 1)
val output = ex.eval(variables)
// output = 4.0

val output1 = ex.eval(Map("a1" -> 8.0, "a2" -> 2))
// output1 = 9.0

Release

# Ref: https://central.sonatype.org/pages/apache-maven.html
mvn release:clean release:prepare
mvn release:perform