src/Tizen.NUI/src/internal/Xaml/TypeConversionExtensions.cs

   1 //
   2 // TypeConversionExtensions.cs
   3 //
   4 // Author:
   5 //       Stephane Delcroix <stephane@mi8.be>
   6 //
   7 // Copyright (c) 2013 Mobile Inception
   8 // Copyright (c) 2014 Xamarin, Inc.
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining a copy
  11 // of this software and associated documentation files (the "Software"), to deal
  12 // in the Software without restriction, including without limitation the rights
  13 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14 // copies of the Software, and to permit persons to whom the Software is
  15 // furnished to do so, subject to the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be included in
  18 // all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26 // THE SOFTWARE.
  27
  28 using System;
  29 using System.Collections.Generic;
  30 using System.Globalization;
  31 using System.Linq;
  32 using System.Reflection;
  33 // using Tizen.NUI.Binding.Internals;
  34 using Tizen.NUI.Xaml.Internals;
  35 using Tizen.NUI.Binding;
  36
  37 namespace Tizen.NUI.Xaml
  38 {
  39     internal static class TypeConversionExtensions
  40     {
  41         internal static object ConvertTo(this object value, Type toType, Func<ParameterInfo> pinfoRetriever,
  42             IServiceProvider serviceProvider)
  43         {
  44             Func<TypeConverter> getConverter = () =>
  45             {
  46                 ParameterInfo pInfo;
  47                 if (pinfoRetriever == null || (pInfo = pinfoRetriever()) == null)
  48                     return null;
  49
  50                 var converterTypeName = pInfo.CustomAttributes.GetTypeConverterTypeName();
  51                 if (converterTypeName == null)
  52                     return null;
  53                 var convertertype = Type.GetType(converterTypeName);
  54                 return (TypeConverter)Activator.CreateInstance(convertertype);
  55             };
  56
  57             return ConvertTo(value, toType, getConverter, serviceProvider);
  58         }
  59
  60         internal static object ConvertTo(this object value, Type toType, Func<MemberInfo> minfoRetriever,
  61             IServiceProvider serviceProvider)
  62         {
  63             Func<object> getConverter = () =>
  64             {
  65                 MemberInfo memberInfo;
  66                 string converterTypeName = null;
  67                 Type realType = toType;
  68
  69                 if (true == realType.IsGenericType && typeof(Nullable<>) == realType.GetGenericTypeDefinition())
  70                 {
  71                     realType = realType.GetGenericArguments()[0];
  72                 }
  73
  74                 converterTypeName = realType.CustomAttributes.GetTypeConverterTypeName();
  75                 if (minfoRetriever != null && (memberInfo = minfoRetriever()) != null)
  76                     converterTypeName = memberInfo.CustomAttributes.GetTypeConverterTypeName() ?? converterTypeName;
  77
  78                 if (converterTypeName == null)
  79                 {
  80                     converterTypeName = toType.FullName + "TypeConverter";
  81                 }
  82
  83                 var convertertype = Type.GetType(converterTypeName);
  84
  85                 if (null == convertertype)
  86                 {
  87                     return null;
  88                 }
  89                 else
  90                 {
  91                     return Activator.CreateInstance(convertertype);
  92                 }
  93             };
  94
  95             return ConvertTo(value, toType, getConverter, serviceProvider);
  96         }
  97
  98         static string GetTypeConverterTypeName(this IEnumerable<CustomAttributeData> attributes)
  99         {
 100             var converterAttribute =
 101                 attributes.FirstOrDefault(cad => TypeConverterAttribute.TypeConvertersType.Contains(cad.AttributeType.FullName));
 102             if (converterAttribute == null)
 103                 return null;
 104             if (converterAttribute.ConstructorArguments[0].ArgumentType == typeof(string))
 105                 return (string)converterAttribute.ConstructorArguments[0].Value;
 106             if (converterAttribute.ConstructorArguments[0].ArgumentType == typeof(Type))
 107                 return ((Type)converterAttribute.ConstructorArguments[0].Value).AssemblyQualifiedName;
 108             return null;
 109         }
 110
 111         //Don't change the name or the signature of this, it's used by XamlC
 112         public static object ConvertTo(this object value, Type toType, Type convertertype, IServiceProvider serviceProvider)
 113         {
 114             if (convertertype == null)
 115                 return value.ConvertTo(toType, (Func<object>)null, serviceProvider);
 116             Func<object> getConverter = () => Activator.CreateInstance(convertertype);
 117             ;
 118             return value.ConvertTo(toType, getConverter, serviceProvider);
 119         }
 120
 121         private delegate void ParseValueFunc(string s, IFormatProvider provider);
 122
 123         static private Dictionary<Type, ParseValueFunc> typeToParseValueFunc = null;
 124
 125         static private void BuildParseValueFunc()
 126         {
 127             if (null == typeToParseValueFunc)
 128             {
 129                 typeToParseValueFunc = new Dictionary<Type, ParseValueFunc>();
 130
 131             }
 132         }
 133
 134         internal static object ConvertTo(this object value, Type toType, Func<object> getConverter,
 135             IServiceProvider serviceProvider)
 136         {
 137             if (value == null)
 138                 return null;
 139
 140             var str = value as string;
 141             if (str != null)
 142             {
 143                 //If there's a [TypeConverter], use it
 144                 object converter = getConverter?.Invoke();
 145                 if (null != converter)
 146                 {
 147                     var xfTypeConverter = converter as TypeConverter;
 148                     var xfExtendedTypeConverter = xfTypeConverter as IExtendedTypeConverter;
 149                     if (xfExtendedTypeConverter != null)
 150                         return value = xfExtendedTypeConverter.ConvertFromInvariantString(str, serviceProvider);
 151                     if (xfTypeConverter != null)
 152                         return value = xfTypeConverter.ConvertFromInvariantString(str);
 153                     var converterType = converter?.GetType();
 154                     if (converterType != null)
 155                     {
 156                         var convertFromStringInvariant = converterType.GetRuntimeMethod("ConvertFromInvariantString",
 157                             new[] { typeof(string) });
 158                         if (convertFromStringInvariant != null)
 159                             return value = convertFromStringInvariant.Invoke(converter, new object[] { str });
 160                     }
 161                 }
 162
 163                 var ignoreCase = (serviceProvider?.GetService(typeof(IConverterOptions)) as IConverterOptions)?.IgnoreCase ?? false;
 164
 165                 //If the type is nullable, as the value is not null, it's safe to assume we want the built-in conversion
 166                 if (toType.GetTypeInfo().IsGenericType && toType.GetGenericTypeDefinition() == typeof(Nullable<>))
 167                     toType = Nullable.GetUnderlyingType(toType);
 168
 169                 //Obvious Built-in conversions
 170                 if (toType.GetTypeInfo().IsEnum)
 171                     return Enum.Parse(toType, str, ignoreCase);
 172
 173                 if (toType == typeof(SByte))
 174                     return SByte.Parse(str, CultureInfo.InvariantCulture);
 175                 if (toType == typeof(Int16))
 176                     return Int16.Parse(str, CultureInfo.InvariantCulture);
 177                 if (toType == typeof(Int32))
 178                     return Int32.Parse(str, CultureInfo.InvariantCulture);
 179                 if (toType == typeof(Int64))
 180                     return Int64.Parse(str, CultureInfo.InvariantCulture);
 181                 if (toType == typeof(Byte))
 182                     return Byte.Parse(str, CultureInfo.InvariantCulture);
 183                 if (toType == typeof(UInt16))
 184                     return UInt16.Parse(str, CultureInfo.InvariantCulture);
 185                 if (toType == typeof(UInt32))
 186                     return UInt32.Parse(str, CultureInfo.InvariantCulture);
 187                 if (toType == typeof(UInt64))
 188                     return UInt64.Parse(str, CultureInfo.InvariantCulture);
 189                 if (toType == typeof(Single))
 190                     return Single.Parse(str, CultureInfo.InvariantCulture);
 191                 if (toType == typeof(Double))
 192                     return Double.Parse(str, CultureInfo.InvariantCulture);
 193                 if (toType == typeof(Boolean))
 194                     return Boolean.Parse(str);
 195                 if (toType == typeof(TimeSpan))
 196                     return TimeSpan.Parse(str, CultureInfo.InvariantCulture);
 197                 if (toType == typeof(DateTime))
 198                     return DateTime.Parse(str, CultureInfo.InvariantCulture);
 199                 if (toType == typeof(Char))
 200                 {
 201                     char c = '\0';
 202                     Char.TryParse(str, out c);
 203                     return c;
 204                 }
 205                 if (toType == typeof(String) && str.StartsWith("{}", StringComparison.Ordinal))
 206                     return str.Substring(2);
 207                 if (toType == typeof(String))
 208                     return value;
 209                 if (toType == typeof(Decimal))
 210                     return Decimal.Parse(str, CultureInfo.InvariantCulture);
 211             }
 212
 213             //if the value is not assignable and there's an implicit conversion, convert
 214             if (value != null && !toType.IsAssignableFrom(value.GetType()))
 215             {
 216                 var opImplicit = value.GetType().GetImplicitConversionOperator(fromType: value.GetType(), toType: toType)
 217                                 ?? toType.GetImplicitConversionOperator(fromType: value.GetType(), toType: toType);
 218
 219                 if (opImplicit != null)
 220                 {
 221                     value = opImplicit.Invoke(null, new[] { value });
 222                     return value;
 223                 }
 224             }
 225
 226             return value;
 227         }
 228
 229         internal static MethodInfo GetImplicitConversionOperator(this Type onType, Type fromType, Type toType)
 230         {
 231 #if NETSTANDARD1_0
 232             var mi = onType.GetRuntimeMethod("op_Implicit", new[] { fromType });
 233 #else
 234             var bindingFlags = BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy;
 235             var mi = onType.GetMethod("op_Implicit", bindingFlags, null, new[] { fromType }, null);
 236 #endif
 237             if (mi == null) return null;
 238             if (!mi.IsSpecialName) return null;
 239             if (!mi.IsPublic) return null;
 240             if (!mi.IsStatic) return null;
 241             if (!toType.IsAssignableFrom(mi.ReturnType)) return null;
 242
 243             return mi;
 244         }
 245     }
 246 }