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
  67                 var converterTypeName = toType.GetTypeInfo().CustomAttributes.GetTypeConverterTypeName();
  68                 if (minfoRetriever != null && (memberInfo = minfoRetriever()) != null)
  69                     converterTypeName = memberInfo.CustomAttributes.GetTypeConverterTypeName() ?? converterTypeName;
  70                 if (converterTypeName == null)
  71                     return null;
  72
  73                 var convertertype = Type.GetType(converterTypeName);
  74                 return Activator.CreateInstance(convertertype);
  75             };
  76
  77             return ConvertTo(value, toType, getConverter, serviceProvider);
  78         }
  79
  80         static string GetTypeConverterTypeName(this IEnumerable<CustomAttributeData> attributes)
  81         {
  82             var converterAttribute =
  83                 attributes.FirstOrDefault(cad => TypeConverterAttribute.TypeConvertersType.Contains(cad.AttributeType.FullName));
  84             if (converterAttribute == null)
  85                 return null;
  86             if (converterAttribute.ConstructorArguments[0].ArgumentType == typeof (string))
  87                 return (string)converterAttribute.ConstructorArguments[0].Value;
  88             if (converterAttribute.ConstructorArguments[0].ArgumentType == typeof (Type))
  89                 return ((Type)converterAttribute.ConstructorArguments[0].Value).AssemblyQualifiedName;
  90             return null;
  91         }
  92
  93         //Don't change the name or the signature of this, it's used by XamlC
  94         public static object ConvertTo(this object value, Type toType, Type convertertype, IServiceProvider serviceProvider)
  95         {
  96             if (convertertype == null)
  97                 return value.ConvertTo(toType, (Func<object>)null, serviceProvider);
  98             Func<object> getConverter = () => Activator.CreateInstance(convertertype);
  99             ;
 100             return value.ConvertTo(toType, getConverter, serviceProvider);
 101         }
 102
 103         private delegate void ParseValueFunc(string s, IFormatProvider provider);
 104
 105         static private Dictionary<Type, ParseValueFunc> typeToParseValueFunc = null;
 106
 107         static private void BuildParseValueFunc()
 108         {
 109             if (null == typeToParseValueFunc)
 110             {
 111                 typeToParseValueFunc = new Dictionary<Type, ParseValueFunc>();
 112
 113             }
 114         }
 115
 116         internal static object ConvertTo(this object value, Type toType, Func<object> getConverter,
 117             IServiceProvider serviceProvider)
 118         {
 119             if (value == null)
 120                 return null;
 121
 122             var str = value as string;
 123             if (str != null)
 124             {
 125                 //If there's a [TypeConverter], use it
 126                 object converter = getConverter?.Invoke();
 127                 if (null != converter)
 128                 {
 129                     var xfTypeConverter = converter as TypeConverter;
 130                     var xfExtendedTypeConverter = xfTypeConverter as IExtendedTypeConverter;
 131                     if (xfExtendedTypeConverter != null)
 132                         return value = xfExtendedTypeConverter.ConvertFromInvariantString(str, serviceProvider);
 133                     if (xfTypeConverter != null)
 134                         return value = xfTypeConverter.ConvertFromInvariantString(str);
 135                     var converterType = converter?.GetType();
 136                     if (converterType != null)
 137                     {
 138                         var convertFromStringInvariant = converterType.GetRuntimeMethod("ConvertFromInvariantString",
 139                             new[] { typeof(string) });
 140                         if (convertFromStringInvariant != null)
 141                             return value = convertFromStringInvariant.Invoke(converter, new object[] { str });
 142                     }
 143                 }
 144
 145                 var ignoreCase = (serviceProvider?.GetService(typeof(IConverterOptions)) as IConverterOptions)?.IgnoreCase ?? false;
 146
 147                 //If the type is nullable, as the value is not null, it's safe to assume we want the built-in conversion
 148                 if (toType.GetTypeInfo().IsGenericType && toType.GetGenericTypeDefinition() == typeof (Nullable<>))
 149                     toType = Nullable.GetUnderlyingType(toType);
 150
 151                 //Obvious Built-in conversions
 152                 if (toType.GetTypeInfo().IsEnum)
 153                     return Enum.Parse(toType, str, ignoreCase);
 154
 155                 if (toType == typeof(SByte))
 156                     return SByte.Parse(str, CultureInfo.InvariantCulture);
 157                 if (toType == typeof(Int16))
 158                     return Int16.Parse(str, CultureInfo.InvariantCulture);
 159                 if (toType == typeof(Int32))
 160                     return Int32.Parse(str, CultureInfo.InvariantCulture);
 161                 if (toType == typeof(Int64))
 162                     return Int64.Parse(str, CultureInfo.InvariantCulture);
 163                 if (toType == typeof(Byte))
 164                     return Byte.Parse(str, CultureInfo.InvariantCulture);
 165                 if (toType == typeof(UInt16))
 166                     return UInt16.Parse(str, CultureInfo.InvariantCulture);
 167                 if (toType == typeof(UInt32))
 168                     return UInt32.Parse(str, CultureInfo.InvariantCulture);
 169                 if (toType == typeof(UInt64))
 170                     return UInt64.Parse(str, CultureInfo.InvariantCulture);
 171                 if (toType == typeof (Single))
 172                     return Single.Parse(str, CultureInfo.InvariantCulture);
 173                 if (toType == typeof (Double))
 174                     return Double.Parse(str, CultureInfo.InvariantCulture);
 175                 if (toType == typeof (Boolean))
 176                     return Boolean.Parse(str);
 177                 if (toType == typeof (TimeSpan))
 178                     return TimeSpan.Parse(str, CultureInfo.InvariantCulture);
 179                 if (toType == typeof (DateTime))
 180                     return DateTime.Parse(str, CultureInfo.InvariantCulture);
 181                 if (toType == typeof(Char)) {
 182                     char c = '\0';
 183                     Char.TryParse(str, out c);
 184                     return c;
 185                 }
 186                 if (toType == typeof (String) && str.StartsWith("{}", StringComparison.Ordinal))
 187                     return str.Substring(2);
 188                 if (toType == typeof (String))
 189                     return value;
 190                 if (toType == typeof(Decimal))
 191                     return Decimal.Parse(str, CultureInfo.InvariantCulture);
 192             }
 193
 194             //if the value is not assignable and there's an implicit conversion, convert
 195             if (value != null && !toType.IsAssignableFrom(value.GetType())) {
 196                 var opImplicit =   value.GetType().GetImplicitConversionOperator(fromType: value.GetType(), toType: toType)
 197                                 ?? toType.GetImplicitConversionOperator(fromType: value.GetType(), toType: toType);
 198
 199                 if (opImplicit != null) {
 200                     value = opImplicit.Invoke(null, new[] { value });
 201                     return value;
 202                 }
 203             }
 204
 205             var nativeValueConverterService = DependencyService.Get<INativeValueConverterService>();
 206
 207             object nativeValue = null;
 208             if (nativeValueConverterService != null && nativeValueConverterService.ConvertTo(value, toType, out nativeValue))
 209                 return nativeValue;
 210
 211             return value;
 212         }
 213
 214         internal static MethodInfo GetImplicitConversionOperator(this Type onType, Type fromType, Type toType)
 215         {
 216 #if NETSTANDARD1_0
 217             var mi = onType.GetRuntimeMethod("op_Implicit", new[] { fromType });
 218 #else
 219             var bindingFlags = BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy;
 220             var mi = onType.GetMethod("op_Implicit", bindingFlags, null, new[] { fromType }, null);
 221 #endif
 222             if (mi == null) return null;
 223             if (!mi.IsSpecialName) return null;
 224             if (!mi.IsPublic) return null;
 225             if (!mi.IsStatic) return null;
 226             if (!toType.IsAssignableFrom(mi.ReturnType)) return null;
 227
 228             return mi;
 229         }
 230     }
 231 }