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January 31, 2018 21:00
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using System; | |
using System.Collections; | |
using System.Collections.Concurrent; | |
using System.Collections.Generic; | |
using System.Linq; | |
using System.Linq.Expressions; | |
using System.Text; | |
using System.Threading.Tasks; | |
using Xunit; | |
namespace Mustachio.Tests | |
{ | |
public class IEnumerableFormatter | |
{ | |
private readonly IEnumerable _sourceCollection; | |
public string Arguments { get; set; } | |
public IEnumerableFormatter(IEnumerable sourceCollection, string arguments) | |
{ | |
_sourceCollection = sourceCollection; | |
Arguments = arguments; | |
EnumerableFormatter = new Dictionary<string, Func<IEnumerable<object>, string, object>>(); | |
EnumerableFormatter.Add("order by desc ", (collection, arg) => collection.OrderByDescending(PropExpression(arg))); | |
EnumerableFormatter.Add("order by ", (collection, arg) => collection.OrderBy(PropExpression(arg))); | |
EnumerableFormatter.Add("order desc", (collection, arg) => collection.OrderByDescending(e => e)); | |
EnumerableFormatter.Add("order", (collection, arg) => collection.OrderBy(e => e)); | |
EnumerableFormatter.Add("contains ", (collection, arg) => collection.Any(e => e.Equals(arg))); | |
EnumerableFormatter.Add("count", (collection, arg) => collection.Count()); | |
EnumerableFormatter.Add("element at ", (collection, arg) => collection.ElementAt(int.Parse(arg))); | |
EnumerableFormatter.Add("distinct", (collection, arg) => collection.Distinct()); | |
EnumerableFormatter.Add("first or default", (collection, arg) => collection.FirstOrDefault()); | |
EnumerableFormatter.Add("group by ", (collection, arg) => collection.GroupBy(PropExpression(arg))); | |
EnumerableFormatter.Add("max ", (collection, arg) => collection.Max(PropExpression(arg))); | |
EnumerableFormatter.Add("max", (collection, arg) => collection.Max()); | |
EnumerableFormatter.Add("min ", (collection, arg) => collection.Min(PropExpression(arg))); | |
EnumerableFormatter.Add("min", (collection, arg) => collection.Min()); | |
EnumerableFormatter.Add("reverse", (collection, arg) => collection.Reverse()); | |
EnumerableFormatter.Add("select ", (collection, arg) => collection.Select(PropExpression(arg))); | |
EnumerableFormatter.Add("take ", (collection, arg) => collection.Take(int.Parse(arg))); | |
} | |
public Func<object, object> PropExpression(string propName) | |
{ | |
var parameterExpression = Expression.Parameter(typeof(object)); | |
var propCall = Expression.Property(parameterExpression, propName); | |
return Expression.Lambda<Func<object, object>>(propCall, parameterExpression).Compile(); | |
} | |
public IDictionary<string, Func<IEnumerable<object>, string, object>> EnumerableFormatter { get; set; } | |
public object FormatArgument() | |
{ | |
var formatter = EnumerableFormatter.FirstOrDefault(e => Arguments.StartsWith(e.Key)); | |
if (formatter.Value != null) | |
{ | |
return formatter.Value(this._sourceCollection.Cast<object>(), Arguments.Remove(0, formatter.Key.Length)); | |
} | |
return _sourceCollection; | |
} | |
} | |
public class ParserCollectionFixture | |
{ | |
private void AddCollectionTypeFormatter(ParserOptions options) | |
{ | |
options.AddFormatter<IEnumerable>((value, arg) => | |
{ | |
var val = value; | |
var formats = arg.Split('|'); | |
foreach (var format in formats) | |
{ | |
var formatter = new IEnumerableFormatter(val, format.Trim()); | |
val = (IEnumerable)formatter.FormatArgument(); | |
} | |
return val; | |
}); | |
} | |
[Fact] | |
public void TestCollectionFormatting() | |
{ | |
var options = new ParserOptions("{{#each data(order)}}{{.}},{{/each}}", null, ParserFixture.DefaultEncoding); | |
var collection = new int[] { 0, 1, 2, 3, 5, 4, 6, 7 }; | |
AddCollectionTypeFormatter(options); | |
var report = Parser.ParseWithOptions(options).ParsedTemplate(new Dictionary<string, object>() | |
{ | |
{ | |
"data", collection | |
} | |
}).Stringify(true, ParserFixture.DefaultEncoding); | |
Assert.Equal(report, collection.OrderBy(e => e).Select(e => e.ToString()).Aggregate((e, f) => e + "," + f) + ","); | |
Console.WriteLine(report); | |
} | |
} | |
} |
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