diff options
Diffstat (limited to 'Xamarin.Forms.Build.Tasks/CompiledConverters/RectangleTypeConverter.cs')
-rw-r--r-- | Xamarin.Forms.Build.Tasks/CompiledConverters/RectangleTypeConverter.cs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Xamarin.Forms.Build.Tasks/CompiledConverters/RectangleTypeConverter.cs b/Xamarin.Forms.Build.Tasks/CompiledConverters/RectangleTypeConverter.cs new file mode 100644 index 00000000..af480667 --- /dev/null +++ b/Xamarin.Forms.Build.Tasks/CompiledConverters/RectangleTypeConverter.cs @@ -0,0 +1,49 @@ +using System; +using System.Collections.Generic; +using System.Globalization; +using System.Linq; + +using Mono.Cecil; +using Mono.Cecil.Cil; + +using Xamarin.Forms.Xaml; + +namespace Xamarin.Forms.Core.XamlC +{ + class RectangleTypeConverter : ICompiledTypeConverter + { + public IEnumerable<Instruction> ConvertFromString(string value, ModuleDefinition module, BaseNode node) + { + if (string.IsNullOrEmpty(value)) + throw new XamlParseException($"Cannot convert \"{value}\" into {typeof(Rectangle)}", node); + double x, y, w, h; + var xywh = value.Split(','); + if (xywh.Length != 4 || + !double.TryParse(xywh [0], NumberStyles.Number, CultureInfo.InvariantCulture, out x) || + !double.TryParse(xywh [1], NumberStyles.Number, CultureInfo.InvariantCulture, out y) || + !double.TryParse(xywh [2], NumberStyles.Number, CultureInfo.InvariantCulture, out w) || + !double.TryParse(xywh [3], NumberStyles.Number, CultureInfo.InvariantCulture, out h)) + throw new XamlParseException($"Cannot convert \"{value}\" into {typeof(Rectangle)}", node); + + return GenerateIL(x, y, w, h, module); + } + + IEnumerable<Instruction> GenerateIL(double x, double y, double w, double h, ModuleDefinition module) + { +// IL_0000: ldc.r8 3.1000000000000001 +// IL_0009: ldc.r8 4.2000000000000002 +// IL_0012: ldc.r8 5.2999999999999998 +// IL_001b: ldc.r8 6.4000000000000004 +// IL_0024: newobj instance void valuetype Test.Rectangle::'.ctor'(float64, float64, float64, float64) + + yield return Instruction.Create(OpCodes.Ldc_R8, x); + yield return Instruction.Create(OpCodes.Ldc_R8, y); + yield return Instruction.Create(OpCodes.Ldc_R8, w); + yield return Instruction.Create(OpCodes.Ldc_R8, h); + + var rectangleCtor = module.Import(typeof(Rectangle)).Resolve().Methods.FirstOrDefault(md => md.IsConstructor && md.Parameters.Count == 4); + var rectangleCtorRef = module.Import(rectangleCtor); + yield return Instruction.Create(OpCodes.Newobj, rectangleCtorRef); + } + } +}
\ No newline at end of file |