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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 ThicknessTypeConverter : ICompiledTypeConverter
{
public IEnumerable<Instruction> ConvertFromString(string value, ModuleDefinition module, BaseNode node)
{
if (!string.IsNullOrEmpty(value)) {
double l, t, r, b;
var thickness = value.Split(',');
switch (thickness.Length) {
case 1:
if (double.TryParse(thickness[0], NumberStyles.Number, CultureInfo.InvariantCulture, out l))
return GenerateIL(module, l);
break;
case 2:
if (double.TryParse(thickness[0], NumberStyles.Number, CultureInfo.InvariantCulture, out l) &&
double.TryParse(thickness[1], NumberStyles.Number, CultureInfo.InvariantCulture, out t))
return GenerateIL(module, l, t);
break;
case 4:
if (double.TryParse(thickness[0], NumberStyles.Number, CultureInfo.InvariantCulture, out l) &&
double.TryParse(thickness[1], NumberStyles.Number, CultureInfo.InvariantCulture, out t) &&
double.TryParse(thickness[2], NumberStyles.Number, CultureInfo.InvariantCulture, out r) &&
double.TryParse(thickness[3], NumberStyles.Number, CultureInfo.InvariantCulture, out b))
return GenerateIL(module, l, t, r, b);
break;
}
}
throw new XamlParseException($"Cannot convert \"{value}\" into {typeof(Thickness)}", node);
}
IEnumerable<Instruction> GenerateIL(ModuleDefinition module, params double[] args)
{
foreach (var d in args)
yield return Instruction.Create(OpCodes.Ldc_R8, d);
var thicknessCtor = module.Import(typeof(Thickness)).Resolve().Methods.FirstOrDefault(md => md.IsConstructor && md.Parameters.Count == args.Length);
var thicknessCtorRef = module.Import(thicknessCtor);
yield return Instruction.Create(OpCodes.Newobj, thicknessCtorRef);
}
}
}
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