import java.util.*

val types = listOf(
    "Binary   : Expr left, Token operator, Expr right",
    "Grouping : Expr expression",
    "Literal  : Any? value",
    "Unary    : Token operator, Expr right"
)

println("package fr.celticinfo.lox")

println()
println("interface ExprVisitor<R> {")
for (type in types) {
    val parts = type.split(":")
    val name = parts[0].trim()
    println("    fun visit$name(${name.lowercase(Locale.getDefault())}: $name): R")
}
println("}")

println()
println("""/**
 * The Expr class represents the different types of expressions that can be parsed by the Parser.
 */""".trimIndent())
println("sealed class Expr {")
println("    abstract fun <R> accept(visitor: ExprVisitor<R>): R")
println("}")
for (type in types) {
    val parts = type.split(":")
    val name = parts[0].trim()
    val fields = parts[1].trim().split(",").map { it.trim() }
    println()
    println("data class $name(")
    for (field in fields) {
        val fparts = field.split(" ")
        val ftype = fparts[0]
        val fname = fparts[1]
        val sep = if (field == fields.last()) "" else ","
        println("    val $fname: $ftype$sep")
    }
    println(") : Expr() {")
    println("    override fun <R> accept(visitor: ExprVisitor<R>): R {")
    println("        return visitor.visit$name(this)")
    println("    }")
    println("}")
}