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using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.Xna.Framework.Input;
using Newtonsoft.Json;
namespace StardewModdingAPI.Framework.Serialisation
{
/// <summary>Encapsulates SMAPI's JSON file parsing.</summary>
internal class JsonHelper
{
/*********
** Accessors
*********/
/// <summary>The JSON settings to use when serialising and deserialising files.</summary>
private readonly JsonSerializerSettings JsonSettings = new JsonSerializerSettings
{
Formatting = Formatting.Indented,
ObjectCreationHandling = ObjectCreationHandling.Replace, // avoid issue where default ICollection<T> values are duplicated each time the config is loaded
Converters = new List<JsonConverter>
{
new SelectiveStringEnumConverter(typeof(Buttons), typeof(Keys))
}
};
/*********
** Public methods
*********/
/// <summary>Read a JSON file.</summary>
/// <typeparam name="TModel">The model type.</typeparam>
/// <param name="fullPath">The absolete file path.</param>
/// <returns>Returns the deserialised model, or <c>null</c> if the file doesn't exist or is empty.</returns>
/// <exception cref="InvalidOperationException">The given path is empty or invalid.</exception>
public TModel ReadJsonFile<TModel>(string fullPath)
where TModel : class
{
// validate
if (string.IsNullOrWhiteSpace(fullPath))
throw new ArgumentException("The file path is empty or invalid.", nameof(fullPath));
// read file
string json;
try
{
json = File.ReadAllText(fullPath);
}
catch (Exception ex) when (ex is DirectoryNotFoundException || ex is FileNotFoundException)
{
return null;
}
// deserialise model
try
{
return JsonConvert.DeserializeObject<TModel>(json, this.JsonSettings);
}
catch (JsonReaderException ex)
{
string message = $"The file at {fullPath} doesn't seem to be valid JSON.";
string text = File.ReadAllText(fullPath);
if (text.Contains("“") || text.Contains("”"))
message += " Found curly quotes in the text; note that only straight quotes are allowed in JSON.";
message += $"\nTechnical details: {ex.Message}";
throw new JsonReaderException(message);
}
}
/// <summary>Save to a JSON file.</summary>
/// <typeparam name="TModel">The model type.</typeparam>
/// <param name="fullPath">The absolete file path.</param>
/// <param name="model">The model to save.</param>
/// <exception cref="InvalidOperationException">The given path is empty or invalid.</exception>
public void WriteJsonFile<TModel>(string fullPath, TModel model)
where TModel : class
{
// validate
if (string.IsNullOrWhiteSpace(fullPath))
throw new ArgumentException("The file path is empty or invalid.", nameof(fullPath));
// create directory if needed
string dir = Path.GetDirectoryName(fullPath);
if (dir == null)
throw new ArgumentException("The file path is invalid.", nameof(fullPath));
if (!Directory.Exists(dir))
Directory.CreateDirectory(dir);
// write file
string json = JsonConvert.SerializeObject(model, this.JsonSettings);
File.WriteAllText(fullPath, json);
}
}
}
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