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UrlSearchParams.cs
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UrlSearchParams.cs
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namespace AngleSharp.Dom
{
using AngleSharp.Attributes;
using AngleSharp.Text;
using System;
using System.Collections.Generic;
using System.Linq;
/// <summary>
/// Represents a list of query parameters.
/// </summary>
[DomName("URLSearchParams")]
[DomExposed("Window")]
[DomExposed("Worker")]
public class UrlSearchParams
{
#region Fields
private readonly List<KeyValuePair<String, String>> _values;
private readonly Url? _parent;
#endregion
#region Constructors
/// <summary>
/// Creates a new instance.
/// </summary>
[DomConstructor]
public UrlSearchParams() => _values = new();
internal UrlSearchParams(Url parent) : this(parent.Query ?? String.Empty)
{
_parent = parent;
}
/// <summary>
/// Creates a new instance filled from the provided string.
/// </summary>
[DomConstructor]
public UrlSearchParams(String init) : this() => ChangeTo(init, false);
#endregion
#region Methods
internal void Reset() => _values.Clear();
internal void ChangeTo(String query, Boolean fromParent)
{
Reset();
if (query is "")
{
return;
}
foreach (var pair in query.Split('&'))
{
var kvp = pair.Split('=');
if (kvp.Length > 1)
{
AppendCore(Decode(kvp[0]), Decode(kvp[1]));
}
else
{
AppendCore(Decode(pair), String.Empty);
}
}
RaiseChanged(fromParent);
}
/// <summary>
/// Appends another value for the given search param name.
/// </summary>
/// <param name="name">The name of the param.</param>
/// <param name="value">The value of the param.</param>
[DomName("append")]
public void Append(String name, String value)
{
AppendCore(name, value);
RaiseChanged(false);
}
private void AppendCore(String name, String value)
{
_values.Add(new KeyValuePair<String, String>(name, value));
}
/// <summary>
/// Deletes the values of the search param name.
/// </summary>
/// <param name="name">The name of the param.</param>
[DomName("delete")]
public void Delete(String name)
{
DeleteCore(name);
RaiseChanged(false);
}
private void DeleteCore(String name)
{
_values.RemoveAll(p => p.Key == name);
}
/// <summary>
/// Gets the first value of the given search param name, if any.
/// </summary>
/// <param name="name">The name of the param.</param>
/// <returns>The value of the param, if any.</returns>
[DomName("get")]
public String? Get(String name) => _values.Find(p => p.Key == name).Value;
/// <summary>
/// Gets all values for the given search param name.
/// </summary>
/// <param name="name">The name of the param.</param>
/// <returns>The list with all stored values.</returns>
[DomName("getAll")]
public String[] GetAll(String name) => _values.FindAll(p => p.Key == name).Select(m => m.Value).ToArray();
/// <summary>
/// Checks if a search param with the given name exists.
/// </summary>
/// <param name="name">The name of the param.</param>
/// <returns>True if such a param exists, otherwise false.</returns>
[DomName("has")]
public Boolean Has(String name) => _values.Any(p => p.Key == name);
/// <summary>
/// Sets the given search param.
/// </summary>
/// <param name="name">The name of the param.</param>
/// <param name="value">The value of the param.</param>
[DomName("set")]
public void Set(String name, String value)
{
if (Has(name))
{
var index = _values.FindIndex(p => p.Key == name);
DeleteCore(name);
_values.Insert(index, new KeyValuePair<String, String>(name, value));
}
else
{
AppendCore(name, value);
}
RaiseChanged(false);
}
/// <summary>
/// Sorts the underlying list.
/// </summary>
[DomName("sort")]
public void Sort()
{
_values.Sort((a, b) => a.Key.CompareTo(b.Key));
RaiseChanged(false);
}
/// <inheritdoc />
public override String ToString() => String.Join("&", _values.Select(p => $"{Encode(p.Key)}={Encode(p.Value)}"));
#endregion
#region Helpers
private static String Encode(String value)
{
var sb = StringBuilderPool.Obtain();
foreach (var chr in value)
{
if (chr.IsAlphanumericAscii() || chr is Symbols.Minus or Symbols.Underscore or Symbols.ExclamationMark or Symbols.Asterisk or Symbols.ReverseSolidus or Symbols.RoundBracketOpen or Symbols.RoundBracketClose or Symbols.Tilde)
{
sb.Append(chr);
}
else
{
sb.Append(Symbols.Percent);
sb.Append(((Int32)chr).ToString("X2"));
}
}
return sb.ToPool();
}
private static String Decode(String value)
{
var sb = StringBuilderPool.Obtain();
for (var i = 0; i < value.Length; i++)
{
var chr = value[i];
if (chr is Symbols.Percent && i + 2 < value.Length)
{
var count = value.Substring(i + 1, 2).FromHex();
sb.Append((Char)count);
i += 2;
}
else
{
sb.Append(chr);
}
}
return sb.ToPool();
}
private void RaiseChanged(Boolean fromParent)
{
if (!fromParent)
{
var qs = ToString();
_parent?.ParseQuery(qs, 0, qs.Length, true, true);
}
}
#endregion
}
}