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/*
* Copyright 2017-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.serialization.json.internal
import kotlinx.serialization.json.*
internal class JsonParser(private val reader: JsonReader) {
private fun readObject(): JsonElement {
reader.requireTokenClass(TC_BEGIN_OBJ) { "Expected start of object" }
reader.nextToken()
val result: MutableMap<String, JsonElement> = linkedMapOf()
while (true) {
if (reader.tokenClass == TC_COMMA) reader.nextToken()
if (!reader.canBeginValue) break
val key = reader.takeString()
reader.requireTokenClass(TC_COLON) { "Expected ':'" }
reader.nextToken()
val elem = read()
result[key] = elem
}
reader.requireTokenClass(TC_END_OBJ) { "Expected end of object" }
reader.nextToken()
return JsonObject(result)
}
private fun readValue(isString: Boolean): JsonElement {
val str = reader.takeString()
return JsonLiteral(str, isString)
}
private fun readArray(): JsonElement {
reader.requireTokenClass(TC_BEGIN_LIST) { "Expected start of array" }
reader.nextToken()
val result: MutableList<JsonElement> = arrayListOf()
while (true) {
if (reader.tokenClass == TC_COMMA) reader.nextToken()
if (!reader.canBeginValue) break
val elem = read()
result.add(elem)
}
reader.requireTokenClass(TC_END_LIST) { "Expected end of array" }
reader.nextToken()
return JsonArray(result)
}
fun read(): JsonElement {
if (!reader.canBeginValue) fail(reader.currentPosition, "Can't begin reading value from here")
val tc = reader.tokenClass
return when (tc) {
TC_NULL -> JsonNull.also { reader.nextToken() }
TC_STRING -> readValue(isString = true)
TC_OTHER -> readValue(isString = false)
TC_BEGIN_OBJ -> readObject()
TC_BEGIN_LIST -> readArray()
else -> fail(reader.currentPosition, "Can't begin reading element")
}
}
}
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