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using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace StardewModdingAPI.Toolkit.Serialisation.Converters
{
/// <summary>Handles deserialisation of <see cref="ISemanticVersion"/>.</summary>
internal class SemanticVersionConverter : JsonConverter
{
/*********
** Accessors
*********/
/// <summary>Get whether this converter can read JSON.</summary>
public override bool CanRead => true;
/// <summary>Get whether this converter can write JSON.</summary>
public override bool CanWrite => true;
/*********
** Public methods
*********/
/// <summary>Get whether this instance can convert the specified object type.</summary>
/// <param name="objectType">The object type.</param>
public override bool CanConvert(Type objectType)
{
return typeof(ISemanticVersion).IsAssignableFrom(objectType);
}
/// <summary>Reads the JSON representation of the object.</summary>
/// <param name="reader">The JSON reader.</param>
/// <param name="objectType">The object type.</param>
/// <param name="existingValue">The object being read.</param>
/// <param name="serializer">The calling serializer.</param>
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
string path = reader.Path;
switch (reader.TokenType)
{
case JsonToken.StartObject:
return this.ReadObject(JObject.Load(reader));
case JsonToken.String:
return this.ReadString(JToken.Load(reader).Value<string>(), path);
default:
throw new SParseException($"Can't parse {nameof(ISemanticVersion)} from {reader.TokenType} node (path: {reader.Path}).");
}
}
/// <summary>Writes the JSON representation of the object.</summary>
/// <param name="writer">The JSON writer.</param>
/// <param name="value">The value.</param>
/// <param name="serializer">The calling serializer.</param>
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
writer.WriteValue(value?.ToString());
}
/*********
** Private methods
*********/
/// <summary>Read a JSON object.</summary>
/// <param name="obj">The JSON object to read.</param>
private ISemanticVersion ReadObject(JObject obj)
{
int major = obj.ValueIgnoreCase<int>(nameof(ISemanticVersion.MajorVersion));
int minor = obj.ValueIgnoreCase<int>(nameof(ISemanticVersion.MinorVersion));
int patch = obj.ValueIgnoreCase<int>(nameof(ISemanticVersion.PatchVersion));
string prereleaseTag = obj.ValueIgnoreCase<string>(nameof(ISemanticVersion.PrereleaseTag));
return new SemanticVersion(major, minor, patch, prereleaseTag);
}
/// <summary>Read a JSON string.</summary>
/// <param name="str">The JSON string value.</param>
/// <param name="path">The path to the current JSON node.</param>
private ISemanticVersion ReadString(string str, string path)
{
if (string.IsNullOrWhiteSpace(str))
return null;
if (!SemanticVersion.TryParse(str, out ISemanticVersion version))
throw new SParseException($"Can't parse semantic version from invalid value '{str}', should be formatted like 1.2, 1.2.30, or 1.2.30-beta (path: {path}).");
return version;
}
}
}
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