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using System;
using System.Collections.Generic;
using System.Linq;
using Mono.Cecil;
using Mono.Cecil.Cil;
using Xamarin.Forms.Xaml;
using Xamarin.Forms.Build.Tasks;
namespace Xamarin.Forms.Core.XamlC
{
class ListStringTypeConverter : ICompiledTypeConverter
{
public IEnumerable<Instruction> ConvertFromString(string value, ModuleDefinition module, BaseNode node)
{
if (value == null) {
yield return Instruction.Create(OpCodes.Ldnull);
yield break;
}
var parts = value.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries).Select(s => s.Trim()).ToList();
var listCtor = module.Import(typeof(List<>)).Resolve().Methods.FirstOrDefault(md => md.IsConstructor && md.Parameters.Count == 1 && md.Parameters[0].ParameterType.FullName == "System.Int32");
var listCtorRef = module.Import(listCtor);
listCtorRef = module.Import(listCtorRef.ResolveGenericParameters(module.Import(typeof(List<string>)), module));
var adder = module.Import(typeof(ICollection<>)).Resolve().Methods.FirstOrDefault(md => md.Name == "Add" && md.Parameters.Count == 1);
var adderRef = module.Import(adder);
adderRef = module.Import(adderRef.ResolveGenericParameters(module.Import(typeof(ICollection<string>)), module));
yield return Instruction.Create(OpCodes.Ldc_I4, parts.Count);
yield return Instruction.Create(OpCodes.Newobj, listCtorRef);
foreach (var part in parts) {
yield return Instruction.Create(OpCodes.Dup);
yield return Instruction.Create(OpCodes.Ldstr, part);
yield return Instruction.Create(OpCodes.Callvirt, adderRef);
}
}
}
}
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