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JExtensions.cs
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JExtensions.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
#if !NET6_0_OR_GREATER
using System;
using System.Collections.Generic;
using System.IO;
#endif
using Microsoft.TemplateEngine.Abstractions.PhysicalFileSystem;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace Microsoft.TemplateEngine
{
internal static class JExtensions
{
internal static string? ToString(this JToken? token, string? key)
{
if (key == null)
{
if (token == null || token.Type != JTokenType.String)
{
return null;
}
return token.ToString();
}
if (token is not JObject obj)
{
return null;
}
if (!obj.TryGetValue(key, StringComparison.OrdinalIgnoreCase, out JToken? element) || element.Type != JTokenType.String)
{
return null;
}
return element.ToString();
}
internal static bool TryGetValue(this JToken? token, string? key, out JToken? result)
{
result = null;
// determine which token to bool-ify
if (token == null)
{
return false;
}
else if (key == null)
{
result = token;
}
else if (!((JObject)token).TryGetValue(key, StringComparison.OrdinalIgnoreCase, out result))
{
return false;
}
return true;
}
internal static bool TryParseBool(this JToken token, out bool result)
{
result = false;
return (token.Type == JTokenType.Boolean || token.Type == JTokenType.String)
&&
bool.TryParse(token.ToString(), out result);
}
internal static bool ToBool(this JToken? token, string? key = null, bool defaultValue = false)
{
if (!token.TryGetValue(key, out JToken? checkToken))
{
return defaultValue;
}
if (!checkToken!.TryParseBool(out bool result))
{
result = defaultValue;
}
return result;
}
internal static int ToInt32(this JToken? token, string? key = null, int defaultValue = 0)
{
int value;
if (key == null)
{
if (token == null || token.Type != JTokenType.Integer || !int.TryParse(token.ToString(), out value))
{
return defaultValue;
}
return value;
}
if (token is not JObject obj)
{
return defaultValue;
}
if (!obj.TryGetValue(key, StringComparison.OrdinalIgnoreCase, out JToken? element))
{
return defaultValue;
}
else if (element.Type == JTokenType.Integer)
{
return element.ToInt32();
}
else if (int.TryParse(element.ToString(), out value))
{
return value;
}
return defaultValue;
}
internal static T ToEnum<T>(this JToken token, string? key = null, T defaultValue = default)
where T : struct
{
string? val = token.ToString(key);
if (val == null || !Enum.TryParse(val, out T result))
{
return defaultValue;
}
return result;
}
internal static Guid ToGuid(this JToken token, string? key = null, Guid defaultValue = default)
{
string? val = token.ToString(key);
if (val == null || !Guid.TryParse(val, out Guid result))
{
return defaultValue;
}
return result;
}
internal static IEnumerable<JProperty> PropertiesOf(this JToken? token, string? key = null)
{
JObject? currentJObj = token as JObject;
if (currentJObj == null)
{
return Array.Empty<JProperty>();
}
if (key != null)
{
if (!currentJObj.TryGetValue(key, StringComparison.OrdinalIgnoreCase, out JToken? element))
{
return Array.Empty<JProperty>();
}
currentJObj = element as JObject;
}
if (currentJObj == null)
{
return Array.Empty<JProperty>();
}
return currentJObj.Properties();
}
internal static T? Get<T>(this JToken? token, string? key)
where T : JToken
{
if (token is not JObject obj || key == null)
{
return default;
}
if (!obj.TryGetValue(key, StringComparison.OrdinalIgnoreCase, out JToken? res))
{
return default;
}
return res as T;
}
internal static IReadOnlyList<string> ArrayAsStrings(this JToken? token, string? propertyName = null)
{
if (propertyName != null)
{
token = token.Get<JArray>(propertyName);
}
if (token is not JArray arr)
{
return Array.Empty<string>();
}
List<string> values = new();
foreach (JToken item in arr)
{
if (item != null && item.Type == JTokenType.String)
{
values.Add(item.ToString());
}
}
return values;
}
internal static JObject ReadObject(this IPhysicalFileSystem fileSystem, string path)
{
using (Stream fileStream = fileSystem.OpenRead(path))
using (var textReader = new StreamReader(fileStream, System.Text.Encoding.UTF8, true))
using (var jsonReader = new JsonTextReader(textReader))
{
return JObject.Load(jsonReader);
}
}
internal static void WriteObject(this IPhysicalFileSystem fileSystem, string path, object obj)
{
using (Stream fileStream = fileSystem.CreateFile(path))
using (var textWriter = new StreamWriter(fileStream, System.Text.Encoding.UTF8))
using (var jsonWriter = new JsonTextWriter(textWriter))
{
var serializer = new JsonSerializer();
serializer.Serialize(jsonWriter, obj);
}
}
internal static bool TryParse(this string arg, out JToken? token)
{
try
{
token = JToken.Parse(arg);
return true;
}
catch
{
token = null;
return false;
}
}
}
}