uidsonic.fluid-json-coding.0.9.22.source-code.JSONDecoder.kt Maven / Gradle / Ivy

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A JSON library written in pure Kotlin (coding extension)
There is a newer version: 0.9.24
package com.github.fluidsonic.fluid.json

import java.io.*


interface JSONDecoder : JSONReader {

	val context: Context


	override fun readValue() =
		readValueOfType()


	fun  readValueOfType(valueType: JSONCodingType): Value


	companion object {

		fun builder(): BuilderForCodecs =
			BuilderForCodecsImpl(context = JSONCodingContext.empty)


		fun  builder(context: Context): BuilderForCodecs =
			BuilderForCodecsImpl(context = context)


		interface BuilderForCodecs {

			fun codecs(
				vararg providers: JSONCodecProvider,
				base: JSONCodecProvider? = JSONCodecProvider.extended
			) =
				codecs(providers = providers.toList(), base = base)


			fun codecs(
				providers: Iterable>,
				base: JSONCodecProvider? = JSONCodecProvider.extended
			): BuilderForSource
		}


		private class BuilderForCodecsImpl(
			private val context: Context
		) : BuilderForCodecs {

			override fun codecs(
				providers: Iterable>,
				base: JSONCodecProvider?
			) =
				BuilderForSourceImpl(
					context = context,
					codecProvider = JSONCodecProvider(base?.let { providers + it } ?: providers)
				)
		}


		interface BuilderForSource {

			fun source(source: JSONReader): Builder


			fun source(source: Reader) =
				source(JSONReader.build(source))


			fun source(source: String) =
				source(StringReader(source))
		}


		private class BuilderForSourceImpl(
			private val context: Context,
			private val codecProvider: JSONCodecProvider
		) : BuilderForSource {

			override fun source(source: JSONReader) =
				BuilderImpl(
					context = context,
					codecProvider = codecProvider,
					source = source
				)
		}


		interface Builder {

			fun build(): JSONDecoder
		}


		private class BuilderImpl(
			private val context: Context,
			private val codecProvider: JSONCodecProvider,
			private val source: JSONReader
		) : Builder {

			override fun build() =
				StandardDecoder(
					context = context,
					codecProvider = codecProvider,
					source = source
				)
		}
	}
}


fun JSONDecoder<*>.invalidPropertyError(property: String, details: String): Nothing =
	schemaError("Invalid value for property '$property': $details")


fun JSONDecoder<*>.invalidValueError(details: String): Nothing =
	schemaError("Invalid value: $details")


fun JSONDecoder<*>.missingPropertyError(property: String): Nothing =
	schemaError("Missing value for property '$property'")


fun JSONDecoder<*>.parsingError(message: String): Nothing =
	throw JSONException.Parsing(
		message = message,
		offset = offset,
		path = path
	)


fun JSONDecoder<*>.readValueOrNull() =
	if (nextToken != JSONToken.nullValue) readValue() else readNull()


inline fun  JSONDecoder<*>.readValueOfType() =
	readValueOfType(jsonCodingType())


inline fun  JSONDecoder<*>.readValueOfTypeOrNull() =
	readValueOfTypeOrNull(jsonCodingType())


fun  JSONDecoder<*>.readValueOfTypeOrNull(valueType: JSONCodingType) =
	readOrNull { readValueOfType(valueType) }


fun JSONDecoder<*>.schemaError(message: String): Nothing =
	throw JSONException.Schema(
		message = message,
		offset = offset,
		path = path
	)