Modified parser example https://github.com/fork-handles/forkhandles/issues/6#issuecomment-771646358

main.kt

//src/main/kotlin/main.kt
import parser4k.*
import parser4k.commonparsers.token
import java.io.BufferedReader
import java.io.InputStreamReader
import java.math.BigDecimal
import kotlin.reflect.KProperty

abstract class CacheContainer<T>(val cache: OutputCache<T> = OutputCache())
object MinimalCalculator: CacheContainer<BigDecimal>() {
  fun binaryExpr(s: String) = inOrder(ref { expr }, token(s), ref { expr })

  val number by cache { oneOrMore(oneOf('0'..'9')).map { it.joinToString("").toBigDecimal() } }
  val paren by cache { inOrder(token("("), ref { expr }, token(")")).skipWrapper() }

  val power by cache { binaryExpr("^").map { (l, _, r) -> l.pow(r.toInt()) } }
  val divide by cache { binaryExpr("/").mapLeftAssoc { (l, _, r) -> l.divide(r) } }
  val multiply by cache { binaryExpr("*").mapLeftAssoc { (l, _, r) -> l * r } }

  val minus by cache { binaryExpr("-").mapLeftAssoc { (l, _, r) -> l - r } }
  val plus by cache { binaryExpr("+").mapLeftAssoc { (l, _, r) -> l + r } }

  val expr: Parser<BigDecimal> = oneOfWithPrecedence(
    oneOf(plus, minus),
    oneOf(multiply, divide),
    power,
    paren.nestedPrecedence(),
    number
  ).reset(cache)

  fun evaluate(s: String) = s.parseWith(expr)
}
operator fun <T> OutputCache<T>.invoke(get_p: () -> Parser<T>) = OutputCacheBy(get_p())
class OutputCacheBy<T>(private val p: Parser<T>) {
  operator fun getValue(self: CacheContainer<T>, _p: KProperty<*>) = p.with(self.cache)
}

fun main(args: Array<String>) {
  val lr = BufferedReader(InputStreamReader(System.`in`))
  fun ps1() = print(">")
  ps1()
  while (true) {
    val ln = lr.readLine()
    if (ln.isNullOrBlank()) break
    println(MinimalCalculator.evaluate(ln)); ps1()
  }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://maven.apache.org/POM/4.0.0"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <artifactId>consoleApp</artifactId>
    <groupId>me.duangsuse</groupId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>consoleApp</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <kotlin.code.style>official</kotlin.code.style>
        <kotlin.compiler.jvmTarget>1.8</kotlin.compiler.jvmTarget>
    </properties>

    <repositories>
        <repository>
            <id>mavenCentral</id>
            <url>https://repo1.maven.org/maven2/</url>
        </repository>
    </repositories>

    <build>
        <sourceDirectory>src/main/kotlin</sourceDirectory>
        <testSourceDirectory>src/test/kotlin</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.jetbrains.kotlin</groupId>
                <artifactId>kotlin-maven-plugin</artifactId>
                <version>1.4.10</version>
                <executions>
                    <execution>
                        <id>compile</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>test-compile</id>
                        <phase>test-compile</phase>
                        <goals>
                            <goal>test-compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <version>1.6.0</version>
                <configuration>
                    <mainClass>MainKt</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-test-junit</artifactId>
            <version>1.4.10</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib-jdk8</artifactId>
            <version>1.4.10</version>
        </dependency>
        <dependency>
            <groupId>dev.forkhandles</groupId>
            <artifactId>forkhandles-bom</artifactId>
            <version>1.8.1.0</version>
            <type>pom</type>
        </dependency>
        <dependency>
            <groupId>dev.forkhandles</groupId>
            <artifactId>parser4k</artifactId>
            <version>1.8.1.0</version>
        </dependency>
    </dependencies>
</project>

settings.xml

<settings xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0 http://maven.apache.org/xsd/settings-1.1.0.xsd"
          xmlns="http://maven.apache.org/SETTINGS/1.1.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> 
    <mirrors>
        <mirror>
          <id>alimaven</id>
          <name>aliyun maven</name>
          <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
          <mirrorOf>central</mirrorOf>        
        </mirror>
      </mirrors>
    <profiles>
        <profile>
            <repositories>
                <repository>
                    <snapshots>
                        <enabled>false</enabled>
                    </snapshots>
                    <id>bintray-fork-handles-maven</id>
                    <name>bintray</name>
                    <url>https://dl.bintray.com/fork-handles/maven</url>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <snapshots>
                        <enabled>false</enabled>
                    </snapshots>
                    <id>bintray-fork-handles-maven</id>
                    <name>bintray-plugins</name>
                    <url>https://dl.bintray.com/fork-handles/maven</url>
                </pluginRepository>
            </pluginRepositories>
            <id>bintray</id>
        </profile>
    </profiles>
    <activeProfiles>
        <activeProfile>bintray</activeProfile>
    </activeProfiles>
</settings>