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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);
}
}
}
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