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282using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using QsNet.Enums;
using QsNet.Internal;
using QsNet.Models;
using Decoder = QsNet.Internal.Decoder;
using Encoder = QsNet.Internal.Encoder;
namespace QsNet;
/// <summary>
/// Provides static methods for encoding and decoding query strings and dictionaries.
/// Supports conversion between query strings and Dictionary<object, object?> objects
/// with configurable parsing and encoding options.
/// </summary>
public static class Qs
{
/// <summary>
/// Decode a query string or a Dictionary into a Dictionary<object, object?>.
/// </summary>
/// <param name="input">The query string or Dictionary to decode</param>
/// <param name="options">Optional decoder settings</param>
/// <returns>The decoded Dictionary</returns>
/// <exception cref="ArgumentException">If the input is not a string or Dictionary</exception>
/// <exception cref="InvalidOperationException">If limits are exceeded and ThrowOnLimitExceeded is true</exception>
public static Dictionary<string, object?> Decode(object? input, DecodeOptions? options = null)
{
var opts = options ?? new DecodeOptions();
if (input is not string and not IDictionary and not null)
throw new ArgumentException("The input must be a String or a Map<String, Any?>");
if (input is null or string { Length: 0 } or IDictionary { Count: 0 })
return new Dictionary<string, object?>();
// parse the raw pairs (string-keyed)
var tempObj = input switch
{
string qs => Decoder.ParseQueryStringValues(qs, opts),
IEnumerable<KeyValuePair<string?, object?>> gen => gen.ToDictionary(
kv => kv.Key ?? string.Empty,
kv => Utils.ConvertNestedValues(kv.Value) // value-level walk
),
IDictionary raw => Utils.ConvertNestedDictionary(raw),
_ => null
};
var finalOptions = opts;
if (opts is { ParseLists: true, ListLimit: > 0 } && (tempObj?.Count ?? 0) > opts.ListLimit)
finalOptions = opts.CopyWith(parseLists: false);
// keep internal work in object-keyed maps
if (tempObj is not { Count: > 0 })
return new Dictionary<string, object?>();
var obj = new Dictionary<object, object?>(tempObj.Count);
#if NETSTANDARD2_0
foreach (var kv in tempObj)
{
var key = kv.Key;
var value = kv.Value;
var parsed = Decoder.ParseKeys(key, value, finalOptions, input is string);
if (parsed is null)
continue;
if (obj.Count == 0 && parsed is IDictionary first)
{
obj = Utils.ToObjectKeyedDictionary(first);
continue;
}
var merged = Utils.Merge(obj, parsed, finalOptions) ?? obj;
obj = merged switch
{
Dictionary<object, object?> d => d,
IDictionary id => Utils.ToObjectKeyedDictionary(id),
_ => obj
};
}
#else
foreach (var (key, value) in tempObj)
{
var parsed = Decoder.ParseKeys(key, value, finalOptions, input is string);
if (parsed is null)
continue;
if (obj.Count == 0 && parsed is IDictionary first)
{
obj = Utils.ToObjectKeyedDictionary(first);
continue;
}
var merged = Utils.Merge(obj, parsed, finalOptions) ?? obj;
obj = merged switch
{
Dictionary<object, object?> d => d,
IDictionary id => Utils.ToObjectKeyedDictionary(id),
_ => obj
};
}
#endif
// compact (still object-keyed), then convert the whole tree to string-keyed
var compacted = Utils.Compact(obj, opts.AllowSparseLists);
return Utils.ToStringKeyDeepNonRecursive(compacted);
}
/// <summary>
/// Encode a Dictionary or IEnumerable into a query string.
/// </summary>
/// <param name="data">The data to encode</param>
/// <param name="options">Optional encoder settings</param>
/// <returns>The encoded query string</returns>
/// <exception cref="InvalidOperationException">Thrown when options/limits are violated during encoding</exception>
public static string Encode(object? data, EncodeOptions? options = null)
{
var opts = options ?? new EncodeOptions();
if (data is null)
return string.Empty;
// Map/Iterable → Dictionary<string, object?>
var obj = data switch
{
Dictionary<string, object?> dict => dict,
IDictionary<string, object?> genericDict => new Dictionary<string, object?>(
genericDict
),
IDictionary map => Utils.ConvertDictionaryToStringKeyed(map),
IEnumerable en and not string => CreateIndexDictionary(en),
_ => new Dictionary<string, object?>()
};
if (obj.Count == 0)
return string.Empty;
// Optional top-level filter: function can replace the object; iterable can supply key order
List<object?>? objKeys = null;
switch (opts.Filter)
{
case FunctionFilter ff:
try
{
var filtered = ff.Function(string.Empty, obj);
obj = filtered switch
{
IDictionary<string, object?> genericFiltered => new Dictionary<
string,
object?
>(genericFiltered),
IDictionary m => Utils.ConvertDictionaryToStringKeyed(m),
_ => obj
};
}
catch
{
// swallow filter exceptions like Kotlin code
}
break;
case IterableFilter wl:
objKeys = wl.Iterable.Cast<object?>().ToList();
break;
}
// Default keys if filter didn't provide
if (objKeys is null)
{
objKeys = new List<object?>(obj.Count);
foreach (var k in obj.Keys)
objKeys.Add(k);
}
// Optional sort
if (opts.Sort != null)
objKeys.Sort(Comparer<object?>.Create(opts.Sort));
// Root side-channel frame (mirrors WeakHashMap chain in Kotlin)
var sideChannel = new SideChannelFrame();
// Collect "key=value" parts
var parts = new List<string>(objKeys.Count);
for (var i = 0; i < objKeys.Count; i++)
{
var keyObj = objKeys[i];
if (keyObj is not string key)
continue;
var hasKey = obj.TryGetValue(key, out var value);
if (!hasKey && opts.SkipNulls)
continue;
if (value is null && opts.SkipNulls)
continue;
var encoded = Encoder.Encode(
value,
!hasKey,
sideChannel,
key,
opts.ListFormat?.GetGenerator(),
opts is { ListFormat: ListFormat.Comma, CommaRoundTrip: true },
opts is { ListFormat: ListFormat.Comma, CommaCompactNulls: true },
opts.AllowEmptyLists,
opts.StrictNullHandling,
opts.SkipNulls,
opts.EncodeDotInKeys,
opts.Encode ? opts.GetEncoder : null,
opts.GetDateSerializer,
opts.Sort,
opts.Filter,
opts.AllowDots,
opts.Format,
opts.Formatter,
opts.EncodeValuesOnly,
opts.Charset,
opts.AddQueryPrefix
);
switch (encoded)
{
case IEnumerable en and not string:
{
foreach (var p in en)
if (p is not null)
parts.Add(p.ToString()!);
break;
}
case string { Length: > 0 } s:
parts.Add(s);
break;
}
}
var joined = string.Join(opts.Delimiter, parts);
// Build final output
var sb = new StringBuilder(joined.Length + 16);
if (opts.AddQueryPrefix)
sb.Append('?');
if (opts.CharsetSentinel)
{
// encodeURIComponent('✓') and encodeURIComponent('✓')
if (opts.Charset.WebName.Equals("iso-8859-1", StringComparison.OrdinalIgnoreCase))
sb.Append(Sentinel.Iso.GetEncoded()).Append(joined.Length > 0 ? "&" : "");
else if (opts.Charset.WebName.Equals("utf-8", StringComparison.OrdinalIgnoreCase))
sb.Append(Sentinel.Charset.GetEncoded()).Append(joined.Length > 0 ? "&" : "");
}
if (joined.Length > 0)
sb.Append(joined);
return sb.ToString();
static Dictionary<string, object?> CreateIndexDictionary(IEnumerable en)
{
var initial = en is ICollection col ? col.Count : 0;
var dict = new Dictionary<string, object?>(initial);
var i = 0;
foreach (var v in en)
dict.Add(i++.ToString(CultureInfo.InvariantCulture), v);
return dict;
}
}
}