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Http4k Moshi JSON support

There is a newer version: 5.35.1.0

package org.http4k.format

import com.squareup.moshi.JsonReader
import com.squareup.moshi.JsonReader.Token.NULL

fun  JsonReader.obj(mk: () -> T, fn: T.(String) -> Unit): T {
    beginObject()
    val item = mk()
    while (hasNext()) item.fn(nextName())
    endObject()
    return item
}

fun  JsonReader.obj(build: (Map) -> T, item: (String) -> Any): T {
    beginObject()
    val map = mutableMapOf()
    while (hasNext()) nextName().also { map[it] = item(it) }
    return build(map).also { endObject() }
}

fun  JsonReader.list(mk: () -> T, item: T.(String) -> Unit) = skipNullOr {
    val items = mutableListOf()
    beginArray()
    while (hasNext()) items += obj(mk, item)
    endArray()
    items
}

fun  JsonReader.list(item: () -> T) = skipNullOr {
    val items = mutableListOf()
    beginArray()
    while (hasNext()) items += item()
    endArray()
    items
}

fun JsonReader.stringList() = skipNullOr {
    beginArray()
    val list = mutableListOf()
    while (hasNext()) list += nextString()
    endArray()
    list
}

fun JsonReader.stringMap(): Map? = skipNullOr {
    beginObject()
    val map = mutableMapOf()
    while (hasNext()) map += nextName() to nextString()
    endObject()
    map
}

fun  JsonReader.map(valueFn: () -> T) = skipNullOr {
    beginObject()
    val map = mutableMapOf()
    while (hasNext()) map += nextName() to valueFn()
    endObject()
    map
}

fun JsonReader.stringOrNull() = if (peek() == NULL) nextNull() else nextString()

private fun  JsonReader.skipNullOr(fn: JsonReader.() -> T) = if (peek() == NULL) skipValue().let { null } else fn()