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using System;
using System.Collections.Generic;
using System.Linq;
using Mono.Cecil;
using Mono.Cecil.Cil;
using Xamarin.Forms.Xaml;
namespace Xamarin.Forms.Core.XamlC
{
class ColorTypeConverter : ICompiledTypeConverter
{
public IEnumerable<Instruction> ConvertFromString(string value, ModuleDefinition module, BaseNode node)
{
do {
if (string.IsNullOrEmpty(value))
break;
value = value.Trim();
if (value.StartsWith("#", StringComparison.Ordinal)) {
var color = Color.FromHex(value);
yield return Instruction.Create(OpCodes.Ldc_R8, color.R);
yield return Instruction.Create(OpCodes.Ldc_R8, color.G);
yield return Instruction.Create(OpCodes.Ldc_R8, color.B);
yield return Instruction.Create(OpCodes.Ldc_R8, color.A);
var colorCtor = module.Import(typeof(Color)).Resolve().Methods.FirstOrDefault(
md => md.IsConstructor && md.Parameters.Count == 4 &&
md.Parameters.All(p => p.ParameterType.FullName == "System.Double"));
var colorCtorRef = module.Import(colorCtor);
yield return Instruction.Create(OpCodes.Newobj, colorCtorRef);
yield break;
}
var parts = value.Split('.');
if (parts.Length == 1 || (parts.Length == 2 && parts [0] == "Color")) {
var color = parts [parts.Length - 1];
var field = module.Import(typeof(Color)).Resolve().Fields.SingleOrDefault(fd => fd.Name == color && fd.IsStatic);
if (field != null) {
yield return Instruction.Create(OpCodes.Ldsfld, module.Import(field));
yield break;
}
var propertyGetter = module.Import(typeof(Color)).Resolve().Properties.SingleOrDefault(pd => pd.Name == color && pd.GetMethod.IsStatic)?.GetMethod;
if (propertyGetter != null) {
yield return Instruction.Create(OpCodes.Call, module.Import(propertyGetter));
yield break;
}
}
} while (false);
throw new XamlParseException($"Cannot convert \"{value}\" into {typeof(Color)}", node);
}
}
}
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