Class public api comparator

ClassComparator.kt

import spoon.Launcher
import spoon.reflect.declaration.CtClass
import spoon.reflect.declaration.CtNamedElement
import java.io.File
import kotlin.system.exitProcess

fun main(args: Array<String>) {
    if (args.size < 2) {
        println("You need to pass two paths")
        exitProcess(1)
    }

    val f0 = File(args[0]).readText()
    val f1 = File(args[1]).readText()

    val c1 = Launcher.parseClass(f0)
    val c0 = Launcher.parseClass(f1)

    c0.compare(c1) { publicFields() }
    c0.compare(c1) { publicMethods() }
}

private inline fun CtClass<*>.compare(other: CtClass<*>, extractor: CtClass<*>.() -> Sequence<CtNamedElement>) {
    val thisListOfElements = extractor()
    val otherListOfElements = other.extractor()
    if (thisListOfElements.count() != otherListOfElements.count()) {
        println("Different methods/fields count in classes $simpleName and ${other.simpleName}")
        exitProcess(1)
    }

    if (thisListOfElements.zip(otherListOfElements).any { (first, second) -> first.simpleName != second.simpleName }) {
        println("Different named methods/fields in classes $simpleName and ${other.simpleName}")
        exitProcess(1)
    }
}

private fun CtClass<*>.publicMethods() = methods.asSequence().filter { !it.isPrivate }.sortedBy { it.simpleName }
private fun CtClass<*>.publicFields() = fields.asSequence().filter { !it.isPrivate }.sortedBy { it.simpleName }