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- using System;
- using System.Collections.Generic;
- using System.Linq.Expressions;
- using System.Reflection;
- using System.Text;
-
- namespace UnityEditor.PostProcessing
- {
- public static class ReflectionUtils
- {
- static Dictionary<KeyValuePair<object, string>, FieldInfo> s_FieldInfoFromPaths = new Dictionary<KeyValuePair<object, string>, FieldInfo>();
-
- public static FieldInfo GetFieldInfoFromPath(object source, string path)
- {
- FieldInfo field = null;
- var kvp = new KeyValuePair<object, string>(source, path);
-
- if (!s_FieldInfoFromPaths.TryGetValue(kvp, out field))
- {
- var splittedPath = path.Split('.');
- var type = source.GetType();
-
- foreach (var t in splittedPath)
- {
- field = type.GetField(t, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
-
- if (field == null)
- break;
-
- type = field.FieldType;
- }
-
- s_FieldInfoFromPaths.Add(kvp, field);
- }
-
- return field;
- }
-
- public static string GetFieldPath<T, TValue>(Expression<Func<T, TValue>> expr)
- {
- MemberExpression me;
- switch (expr.Body.NodeType)
- {
- case ExpressionType.Convert:
- case ExpressionType.ConvertChecked:
- var ue = expr.Body as UnaryExpression;
- me = (ue != null ? ue.Operand : null) as MemberExpression;
- break;
- default:
- me = expr.Body as MemberExpression;
- break;
- }
-
- var members = new List<string>();
- while (me != null)
- {
- members.Add(me.Member.Name);
- me = me.Expression as MemberExpression;
- }
-
- var sb = new StringBuilder();
- for (int i = members.Count - 1; i >= 0; i--)
- {
- sb.Append(members[i]);
- if (i > 0) sb.Append('.');
- }
-
- return sb.ToString();
- }
-
- public static object GetFieldValue(object source, string name)
- {
- var type = source.GetType();
-
- while (type != null)
- {
- var f = type.GetField(name, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
- if (f != null)
- return f.GetValue(source);
-
- type = type.BaseType;
- }
-
- return null;
- }
-
- public static object GetFieldValueFromPath(object source, ref Type baseType, string path)
- {
- var splittedPath = path.Split('.');
- object srcObject = source;
-
- foreach (var t in splittedPath)
- {
- var fieldInfo = baseType.GetField(t, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
-
- if (fieldInfo == null)
- {
- baseType = null;
- break;
- }
-
- baseType = fieldInfo.FieldType;
- srcObject = GetFieldValue(srcObject, t);
- }
-
- return baseType == null
- ? null
- : srcObject;
- }
-
- public static object GetParentObject(string path, object obj)
- {
- var fields = path.Split('.');
-
- if (fields.Length == 1)
- return obj;
-
- var info = obj.GetType().GetField(fields[0], BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
- obj = info.GetValue(obj);
-
- return GetParentObject(string.Join(".", fields, 1, fields.Length - 1), obj);
- }
- }
- }
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