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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace System.Json
{
internal static class Util
{
public static bool CompareObjects<T>(T o1, T o2) where T : class
{
if ((o1 == null) != (o2 == null))
{
return false;
}
return (o1 == null) || o1.Equals(o2);
}
public static bool CompareNullable<T>(Nullable<T> n1, Nullable<T> n2) where T : struct
{
if (n1.HasValue != n2.HasValue)
{
return false;
}
return (!n1.HasValue) || n1.Value.Equals(n2.Value);
}
public static bool CompareLists<T>(List<T> list1, List<T> list2)
{
if (list1 == null)
{
return list2 == null;
}
if (list2 == null)
{
return false;
}
return CompareArrays(list1.ToArray(), list2.ToArray());
}
public static bool CompareDictionaries<K, V>(Dictionary<K, V> dict1, Dictionary<K, V> dict2)
where K : IComparable
where V : class
{
if (dict1 == null)
{
return dict2 == null;
}
if (dict2 == null)
{
return false;
}
List<K> keys1 = new List<K>(dict1.Keys);
List<K> keys2 = new List<K>(dict2.Keys);
keys1.Sort();
keys2.Sort();
if (!CompareLists<K>(keys1, keys2))
{
return false;
}
foreach (K key in keys1)
{
V value1 = dict1[key];
V value2 = dict2[key];
if (!CompareObjects<V>(value1, value2))
{
return false;
}
}
return true;
}
public static bool CompareArrays(Array array1, Array array2)
{
if (array1 == null)
{
return array2 == null;
}
if (array2 == null || array1.Length != array2.Length)
{
return false;
}
for (int i = 0; i < array1.Length; i++)
{
object o1 = array1.GetValue(i);
object o2 = array2.GetValue(i);
if ((o1 == null) != (o2 == null))
{
return false;
}
if (o1 != null)
{
if ((o1 is Array) && (o2 is Array))
{
if (!CompareArrays((Array)o1, (Array)o2))
{
return false;
}
}
else if (o1 is IEnumerable && o2 is IEnumerable)
{
if (!CompareArrays(ToObjectArray((IEnumerable)o1), ToObjectArray((IEnumerable)o2)))
{
return false;
}
}
else
{
if (!o1.Equals(o2))
{
return false;
}
}
}
}
return true;
}
public static int ComputeArrayHashCode(Array array)
{
if (array == null)
{
return 0;
}
int result = 0;
result += array.Length;
for (int i = 0; i < array.Length; i++)
{
object o = array.GetValue(i);
if (o != null)
{
if (o is Array)
{
result ^= ComputeArrayHashCode((Array)o);
}
else if (o is Enumerable)
{
result ^= ComputeArrayHashCode(ToObjectArray((IEnumerable)o));
}
else
{
result ^= o.GetHashCode();
}
}
}
return result;
}
public static string EscapeString(object obj)
{
StringBuilder sb = new StringBuilder();
if (obj == null)
{
return "<<null>>";
}
else
{
string str = obj.ToString();
for (int i = 0; i < str.Length; i++)
{
char c = str[i];
if (c < ' ' || c > '~')
{
sb.AppendFormat("\\u{0:X4}", (int)c);
}
else
{
sb.Append(c);
}
}
}
return sb.ToString();
}
static object[] ToObjectArray(IEnumerable enumerable)
{
List<object> result = new List<object>();
foreach (var item in enumerable)
{
result.Add(item);
}
return result.ToArray();
}
}
}
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