Kotlin Text Replacer

replacer.kt

fun main(args: Array<String>) {
    val param = mapOf(
        "PS" to mapOf(
            "ts" to mapOf(
                "pt" to "Lou",
                "age" to 28
            )
        ),
        "ENV" to mapOf(
            "ver" to 1.0
        )
    )

    val str = "My Name is :{PS.ts.pt}, - :{ENV.ver} version"
    val (ret, d) = _replaceString(str, param)
    println(ret) // "My Name is Lou, - 1.0 version"
}

fun find(name: String, param: Map<String, Any>): String? {
    name.split(".").fold(param) { p, s ->
        when (val r = p[s]) {
            is Map<*, *> -> r as Map<String, Any>
            null -> p
            else -> return r.toString()
        }
    }
    return null
}

fun _replaceString(source: String, param: Map<String, Any>): Pair<String, Boolean> {
    var dirty = false
    val result = source.replace(":\\{([^}]+)}".toRegex()) { matchResult ->
        val (str, n) = matchResult.groups.mapNotNull { it?.value }.take(2)
        val r = find(n, param)
        dirty = r != null
        r.takeIf { dirty } ?: str
    }
    return result to dirty
}