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Filters: organization, typos, remove old tag handling

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Théo Marchal 2022-03-15 00:01:52 +01:00
parent b732457a34
commit 316cfb0a31
7 changed files with 286 additions and 304 deletions
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328
Sources/MpcNET/Commands/Database/FindAndSearchCommands.cs
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@ -7,248 +7,15 @@
namespace MpcNET.Commands.Database namespace MpcNET.Commands.Database
{ {
using System.Collections.Generic; using System.Collections.Generic;
using System.ComponentModel;
using System.Linq; using System.Linq;
using MpcNET.Tags; using MpcNET.Tags;
using MpcNET.Types; using MpcNET.Types;
using MpcNET.Types.Filters;
/// <summary>
/// Operators available for filters in the protocol
/// </summary>
public enum FilterOperator
{
/// <summary>
/// Equal (==)
/// </summary>
[Description("==")]
Equal,
/// <summary>
/// Different (!=)
/// </summary>
[Description("!=")]
Different,
/// <summary>
/// Contains (contains)
/// </summary>
[Description("contains")]
Contains,
/// <summary>
/// Mask (=~)
/// </summary>
[Description("=~")]
Mask,
/// <summary>
/// None ("")
/// </summary>
[Description("")]
None,
}
/// <summary>
/// </summary>
public static class EnumHelper
{
/// <summary>
/// <see cref="GetDescription"/> of the enum
/// </summary>
/// <param name="enumValue"></param>
public static string GetDescription<T>(this T enumValue)
where T : struct, System.IConvertible
{
if (!typeof(T).IsEnum)
return null;
string description = enumValue.ToString();
System.Reflection.FieldInfo fieldInfo = enumValue.GetType().GetField(enumValue.ToString());
if (fieldInfo != null)
{
object[] attributes = fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), true);
if (attributes != null && attributes.Length > 0)
description = ((DescriptionAttribute)attributes[0]).Description;
}
return description;
}
}
/// <summary>
/// Filter interface specialized by filters in the protocol
/// </summary>
public abstract class IFilter
{
/// <summary>
/// Name of the filter
/// </summary>
public string Name;
/// <summary>
/// Operator of the filter
/// </summary>
public FilterOperator Operator;
/// <summary>
/// Value to test
/// </summary>
public string Value;
/// <summary>
/// If the expression is negated
/// </summary>
public bool Negation;
/// <summary>
/// Initializes a new instance of the <see cref="IFilter"/> class.
/// </summary>
/// <param name="Name">Name of the filter</param>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public IFilter(string Name, FilterOperator Operator, string Value, bool Negation = false)
{
this.Name = Name;
this.Operator = Operator;
this.Value = Value;
this.Negation = Negation;
}
/// <summary>
/// Gets the formatted command
/// </summary>
public string GetFormattedCommand()
{
string make = "";
if (Negation)
make += "(!";
make += "(" + Name + " ";
make += Operator.GetDescription();
make += " " + "\\\"" + Value + "\\\"" + ")";
if (Negation)
make += ")";
return make;
}
}
/// <summary>
/// Filter "file"
/// </summary>
public class FilterFile : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterFile"/> class.
/// </summary>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterFile(string Value, FilterOperator Operator, bool Negation = false) : base("file", Operator, Value, Negation)
{
if (Operator != FilterOperator.Equal)
throw new System.ArgumentException("Operator is not compatible: for \"File\" use FilterOperator.Equal.");
this.Name = "file";
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
/// <summary>
/// Filter "TAG"
/// </summary>
public class FilterTag : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterTag"/> class.
/// </summary>
/// <param name="Tag">The tag.</param>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterTag(ITag Tag, string Value, FilterOperator Operator, bool Negation = false) : base(Tag.Value, Operator, Value, Negation)
{
if (Operator != FilterOperator.Equal && Operator != FilterOperator.Different && Operator != FilterOperator.Contains)
throw new System.ArgumentException("Operator is not compatible: for \"TAG\" use FilterOperator.Equal, FilterOperator.Different or FilterOperator.Contains.");
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
/// <summary>
/// Filter "base" (not the interface base class, the base command: restrict search songs to a directory)
/// </summary>
public class FilterBase : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterBase"/> class.
/// </summary>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterBase(string Value, FilterOperator Operator, bool Negation = false) : base("base", Operator, Value, Negation)
{
if (Operator != FilterOperator.None)
throw new System.ArgumentException("Operator is not compatible: for \"base\" use FilterOperator.None.");
this.Name = "base";
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
/// <summary>
/// Filter "modified-since"
/// </summary>
public class FilterModifiedSince : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterModifiedSince"/> class.
/// </summary>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterModifiedSince(string Value, FilterOperator Operator, bool Negation = false) : base("modified-since", Operator, Value, Negation)
{
if (Operator != FilterOperator.None)
throw new System.ArgumentException("Operator is not compatible: for \"ModifiedSince\" use FilterOperator.None.");
this.Name = "modified-since";
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
/// <summary>
/// Filter "AudioFormat"
/// </summary>
public class FilterAudioFormat : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterAudioFormat"/> class.
/// </summary>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterAudioFormat(string Value, FilterOperator Operator, bool Negation = false) : base("AudioFormat", Operator, Value, Negation)
{
if (Operator != FilterOperator.Equal && Operator != FilterOperator.Mask)
throw new System.ArgumentException("Operator is not compatible: for \"AudioFormat\" use FilterOperator.Equal or FilterOperator.Mask.");
this.Name = "AudioFormat";
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
/// <summary> /// <summary>
/// Finds songs in the database that contain "searchText". /// Finds songs in the database that contain "searchText".
/// Since MPD 0.21, search syntax is now (TAG == 'VALUE'). /// Since MPD 0.21, search syntax is now (TAG == 'VALUE').
/// https://www.musicpd.org/doc/html/protocol.html#filters /// https://mpd.readthedocs.io/en/stable/protocol.html#filters
/// </summary> /// </summary>
public class SearchCommand : BaseFilterCommand public class SearchCommand : BaseFilterCommand
{ {
@ -256,16 +23,12 @@ namespace MpcNET.Commands.Database
/// ///
/// </summary> /// </summary>
public override string CommandName => "search"; public override string CommandName => "search";
/// <summary>
///
/// </summary>
public override string Operand => "contains";
/// <summary> /// <summary>
/// Initializes a new instance of the <see cref="SearchCommand"/> class. /// Initializes a new instance of the <see cref="SearchCommand"/> class.
/// </summary> /// </summary>
/// <param name="tag">The tag.</param> /// <param name="tag">The tag.</param>
/// <param name="searchText">The search text.</param> /// <param name="searchText">The search text.</param>
/// <param name="windowStart">Start of the portion of the results desired</param> /// <param name="windowStart">Start of the portion of the results desired</param>
/// <param name="windowEnd">End of the portion of the results desired</param> /// <param name="windowEnd">End of the portion of the results desired</param>
public SearchCommand(ITag tag, string searchText, int windowStart = -1, int windowEnd = -1) : base(tag, searchText, windowStart, windowEnd) { } public SearchCommand(ITag tag, string searchText, int windowStart = -1, int windowEnd = -1) : base(tag, searchText, windowStart, windowEnd) { }
@ -299,7 +62,7 @@ namespace MpcNET.Commands.Database
/// <summary> /// <summary>
/// Finds songs in the database that contain "searchText" and adds them to the queue. /// Finds songs in the database that contain "searchText" and adds them to the queue.
/// Since MPD 0.21, search syntax is now (TAG == 'VALUE'). /// Since MPD 0.21, search syntax is now (TAG == 'VALUE').
/// https://www.musicpd.org/doc/html/protocol.html#filters /// https://mpd.readthedocs.io/en/stable/protocol.html#filters
/// </summary> /// </summary>
public class SearchAddCommand : BaseFilterCommand public class SearchAddCommand : BaseFilterCommand
{ {
@ -307,13 +70,9 @@ namespace MpcNET.Commands.Database
/// ///
/// </summary> /// </summary>
public override string CommandName => "searchadd"; public override string CommandName => "searchadd";
/// <summary>
///
/// </summary>
public override string Operand => "contains";
/// <summary> /// <summary>
/// Initializes a new instance of the <see cref="SearchCommand"/> class. /// Initializes a new instance of the <see cref="SearchAddCommand"/> class.
/// </summary> /// </summary>
/// <param name="tag">The tag.</param> /// <param name="tag">The tag.</param>
/// <param name="searchText">The search text.</param> /// <param name="searchText">The search text.</param>
@ -322,7 +81,7 @@ namespace MpcNET.Commands.Database
public SearchAddCommand(ITag tag, string searchText, int windowStart = -1, int windowEnd = -1) : base(tag, searchText, windowStart, windowEnd) { } public SearchAddCommand(ITag tag, string searchText, int windowStart = -1, int windowEnd = -1) : base(tag, searchText, windowStart, windowEnd) { }
/// <summary> /// <summary>
/// Initializes a new instance of the <see cref="SearchCommand"/> class. /// Initializes a new instance of the <see cref="SearchAddCommand"/> class.
/// </summary> /// </summary>
/// <param name="filters">List of key/value filters</param> /// <param name="filters">List of key/value filters</param>
/// <param name="windowStart">Start of the portion of the results desired</param> /// <param name="windowStart">Start of the portion of the results desired</param>
@ -330,7 +89,7 @@ namespace MpcNET.Commands.Database
public SearchAddCommand(List<KeyValuePair<ITag, string>> filters, int windowStart = -1, int windowEnd = -1) : base(filters, windowStart, windowEnd) { } public SearchAddCommand(List<KeyValuePair<ITag, string>> filters, int windowStart = -1, int windowEnd = -1) : base(filters, windowStart, windowEnd) { }
/// <summary> /// <summary>
/// Initializes a new instance of the <see cref="SearchCommand"/> class. /// Initializes a new instance of the <see cref="SearchAddCommand"/> class.
/// </summary> /// </summary>
/// <param name="filter">Filter</param> /// <param name="filter">Filter</param>
/// <param name="windowStart">Start of the portion of the results desired</param> /// <param name="windowStart">Start of the portion of the results desired</param>
@ -338,7 +97,7 @@ namespace MpcNET.Commands.Database
public SearchAddCommand(IFilter filter, int windowStart = -1, int windowEnd = -1) : base(filter, windowStart, windowEnd) { } public SearchAddCommand(IFilter filter, int windowStart = -1, int windowEnd = -1) : base(filter, windowStart, windowEnd) { }
/// <summary> /// <summary>
/// Initializes a new instance of the <see cref="SearchCommand"/> class. /// Initializes a new instance of the <see cref="SearchAddCommand"/> class.
/// </summary> /// </summary>
/// <param name="filters">List of filters</param> /// <param name="filters">List of filters</param>
/// <param name="windowStart">Start of the portion of the results desired</param> /// <param name="windowStart">Start of the portion of the results desired</param>
@ -349,7 +108,7 @@ namespace MpcNET.Commands.Database
/// <summary> /// <summary>
/// Finds songs in the database that is exactly "searchText". /// Finds songs in the database that is exactly "searchText".
/// Since MPD 0.21, search syntax is now (TAG == 'VALUE'). /// Since MPD 0.21, search syntax is now (TAG == 'VALUE').
/// https://www.musicpd.org/doc/html/protocol.html#filters /// https://mpd.readthedocs.io/en/stable/protocol.html#filters
/// </summary> /// </summary>
public class FindCommand : BaseFilterCommand public class FindCommand : BaseFilterCommand
{ {
@ -357,10 +116,6 @@ namespace MpcNET.Commands.Database
/// ///
/// </summary> /// </summary>
public override string CommandName => "find"; public override string CommandName => "find";
/// <summary>
///
/// </summary>
public override string Operand => "==";
/// <summary> /// <summary>
/// Initializes a new instance of the <see cref="FindCommand"/> class. /// Initializes a new instance of the <see cref="FindCommand"/> class.
@ -402,8 +157,7 @@ namespace MpcNET.Commands.Database
/// </summary> /// </summary>
public abstract class BaseFilterCommand : IMpcCommand<IEnumerable<IMpdFile>> public abstract class BaseFilterCommand : IMpcCommand<IEnumerable<IMpdFile>>
{ {
private readonly List<KeyValuePair<ITag, string>> tagFilters; private readonly List<IFilter> _filters;
private readonly List<IFilter> completeFilters;
private readonly int _start; private readonly int _start;
private readonly int _end; private readonly int _end;
@ -411,11 +165,6 @@ namespace MpcNET.Commands.Database
/// Name of the command to use when deserializing /// Name of the command to use when deserializing
/// </summary> /// </summary>
public abstract string CommandName { get; } public abstract string CommandName { get; }
/// <summary>
/// Operand to use between tags and search text. Can be ==, !=, contains...
/// </summary>
public abstract string Operand { get; }
/// <summary> /// <summary>
/// Initializes a new instance of the <see cref="BaseFilterCommand"/> class. /// Initializes a new instance of the <see cref="BaseFilterCommand"/> class.
@ -424,10 +173,12 @@ namespace MpcNET.Commands.Database
/// <param name="searchText">The search text.</param> /// <param name="searchText">The search text.</param>
/// <param name="windowStart">Start of the portion of the results desired</param> /// <param name="windowStart">Start of the portion of the results desired</param>
/// <param name="windowEnd">End of the portion of the results desired</param> /// <param name="windowEnd">End of the portion of the results desired</param>
public BaseFilterCommand(ITag tag, string searchText, int windowStart = -1, int windowEnd = -1) /// <param name="operand">Operator of the filter</param>
public BaseFilterCommand(ITag tag, string searchText, int windowStart = -1, int windowEnd = -1, FilterOperator operand = FilterOperator.Equal)
{ {
tagFilters = new List<KeyValuePair<ITag, string>>(); _filters = new List<IFilter>();
tagFilters.Add(new KeyValuePair<ITag, string>(tag, searchText)); FilterTag Tag = new FilterTag(tag, searchText, operand);
_filters.Add(Tag);
_start = windowStart; _start = windowStart;
_end = windowEnd; _end = windowEnd;
@ -439,9 +190,11 @@ namespace MpcNET.Commands.Database
/// <param name="filters">List of key/value filters</param> /// <param name="filters">List of key/value filters</param>
/// <param name="windowStart">Start of the portion of the results desired</param> /// <param name="windowStart">Start of the portion of the results desired</param>
/// <param name="windowEnd">End of the portion of the results desired</param> /// <param name="windowEnd">End of the portion of the results desired</param>
public BaseFilterCommand(List<KeyValuePair<ITag, string>> filters, int windowStart = -1, int windowEnd = -1) /// <param name="operand">Operator of the filter</param>
public BaseFilterCommand(List<KeyValuePair<ITag, string>> filters, int windowStart = -1, int windowEnd = -1, FilterOperator operand = FilterOperator.Equal)
{ {
tagFilters = filters; _filters = new List<IFilter>();
_filters.AddRange(filters.Select(filter => new FilterTag(filter.Key, filter.Value, operand)).ToList());
_start = windowStart; _start = windowStart;
_end = windowEnd; _end = windowEnd;
@ -455,8 +208,8 @@ namespace MpcNET.Commands.Database
/// <param name="windowEnd">End of the portion of the results desired</param> /// <param name="windowEnd">End of the portion of the results desired</param>
public BaseFilterCommand(IFilter filters, int windowStart = -1, int windowEnd = -1) public BaseFilterCommand(IFilter filters, int windowStart = -1, int windowEnd = -1)
{ {
completeFilters = new List<IFilter>(); _filters = new List<IFilter>();
completeFilters.Add(filters); _filters.Add(filters);
_start = windowStart; _start = windowStart;
_end = windowEnd; _end = windowEnd;
@ -470,7 +223,7 @@ namespace MpcNET.Commands.Database
/// <param name="windowEnd">End of the portion of the results desired</param> /// <param name="windowEnd">End of the portion of the results desired</param>
public BaseFilterCommand(List<IFilter> filters, int windowStart = -1, int windowEnd = -1) public BaseFilterCommand(List<IFilter> filters, int windowStart = -1, int windowEnd = -1)
{ {
completeFilters = filters; _filters = filters;
_start = windowStart; _start = windowStart;
_end = windowEnd; _end = windowEnd;
@ -486,18 +239,10 @@ namespace MpcNET.Commands.Database
{ {
string cmd = ""; string cmd = "";
if (tagFilters != null) if (_filters != null)
{ {
var serializedFilters = string.Join(" AND ", var serializedFilters = string.Join(" AND ",
tagFilters.Select(x => $"({x.Key.Value} {Operand} {escape(x.Value)})") _filters.Select(x => $"{x.GetFormattedCommand()}")
);
cmd = $@"{CommandName} ""({serializedFilters})""";
}
if (completeFilters != null)
{
var serializedFilters = string.Join(" AND ",
completeFilters.Select(x => $"{x.GetFormattedCommand()}")
); );
cmd = $@"{CommandName} ""({serializedFilters})"""; cmd = $@"{CommandName} ""({serializedFilters})""";
} }
@ -521,31 +266,6 @@ namespace MpcNET.Commands.Database
{ {
return MpdFile.CreateList(response.ResponseValues); return MpdFile.CreateList(response.ResponseValues);
} }
/// <summary>
/// String values are quoted with single or double quotes,
/// and special characters within those values must be escaped with the backslash (\).
/// Keep in mind that the backslash is also the escape character on the protocol level,
/// which means you may need to use double backslash.
///
/// Example expression which matches an artist named foo'bar":
/// (Artist == "foo\'bar\"")
///
/// At the protocol level, the command must look like this:
/// find "(Artist == \"foo\\'bar\\\"\")"
///
/// (https://mpd.readthedocs.io/en/stable/protocol.html#filter-syntax)
/// </summary>
/// <param name="value">Value to escape</param>
/// <returns></returns>
private string escape(string value)
{
var escapedValue = value.Replace(@"\", @"\\\\")
.Replace("'", @"\\'")
.Replace(@"""", @"\\\""");
return $@"\""{escapedValue}\""";
}
} }
// TODO: rescan // TODO: rescan
} }

25
Sources/MpcNET/Types/Filters/FilterAudioFormat.cs Normal file
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@ -0,0 +1,25 @@
namespace MpcNET.Types.Filters
{
/// <summary>
/// Filter "AudioFormat"
/// </summary>
public class FilterAudioFormat : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterAudioFormat"/> class.
/// </summary>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterAudioFormat(string Value, FilterOperator Operator, bool Negation = false) : base("AudioFormat", Operator, Value, Negation)
{
if (Operator != FilterOperator.Equal && Operator != FilterOperator.Mask)
throw new System.ArgumentException("Operator is not compatible: for \"AudioFormat\" use FilterOperator.Equal or FilterOperator.Mask.");
this.Name = "AudioFormat";
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
}

25
Sources/MpcNET/Types/Filters/FilterBase.cs Normal file
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@ -0,0 +1,25 @@
namespace MpcNET.Types.Filters
{
/// <summary>
/// Filter "base" (not the interface base class, the base command: restrict search songs to a directory)
/// </summary>
public class FilterBase : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterBase"/> class.
/// </summary>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterBase(string Value, FilterOperator Operator, bool Negation = false) : base("base", Operator, Value, Negation)
{
if (Operator != FilterOperator.None)
throw new System.ArgumentException("Operator is not compatible: for \"base\" use FilterOperator.None.");
this.Name = "base";
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
}

25
Sources/MpcNET/Types/Filters/FilterFile.cs Normal file
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@ -0,0 +1,25 @@
namespace MpcNET.Types.Filters
{
/// <summary>
/// Filter "file"
/// </summary>
public class FilterFile : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterFile"/> class.
/// </summary>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterFile(string Value, FilterOperator Operator, bool Negation = false) : base("file", Operator, Value, Negation)
{
if (Operator != FilterOperator.Equal)
throw new System.ArgumentException("Operator is not compatible: for \"File\" use FilterOperator.Equal.");
this.Name = "file";
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
}

25
Sources/MpcNET/Types/Filters/FilterModifiedSince.cs Normal file
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@ -0,0 +1,25 @@
namespace MpcNET.Types.Filters
{
/// <summary>
/// Filter "modified-since"
/// </summary>
public class FilterModifiedSince : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterModifiedSince"/> class.
/// </summary>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterModifiedSince(string Value, FilterOperator Operator, bool Negation = false) : base("modified-since", Operator, Value, Negation)
{
if (Operator != FilterOperator.None)
throw new System.ArgumentException("Operator is not compatible: for \"ModifiedSince\" use FilterOperator.None.");
this.Name = "modified-since";
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
}

27
Sources/MpcNET/Types/Filters/FilterTag.cs Normal file
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@ -0,0 +1,27 @@
using MpcNET.Tags;
namespace MpcNET.Types.Filters
{
/// <summary>
/// Filter "TAG"
/// </summary>
public class FilterTag : IFilter
{
/// <summary>
/// Initializes a new instance of the <see cref="FilterTag"/> class.
/// </summary>
/// <param name="Tag">The tag.</param>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public FilterTag(ITag Tag, string Value, FilterOperator Operator, bool Negation = false) : base(Tag.Value, Operator, Value, Negation)
{
if (Operator != FilterOperator.Equal && Operator != FilterOperator.Different && Operator != FilterOperator.Contains)
throw new System.ArgumentException("Operator is not compatible: for \"TAG\" use FilterOperator.Equal, FilterOperator.Different or FilterOperator.Contains.");
this.Value = Value;
this.Operator = Operator;
this.Negation = Negation;
}
}
}

135
Sources/MpcNET/Types/IFilter.cs Normal file
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@ -0,0 +1,135 @@
using System.ComponentModel;
namespace MpcNET.Types
{
/// <summary>
/// Operators available for filters in the protocol
/// </summary>
public enum FilterOperator
{
/// <summary>
/// Equal (==)
/// </summary>
[Description("==")]
Equal,
/// <summary>
/// Different (!=)
/// </summary>
[Description("!=")]
Different,
/// <summary>
/// Contains (contains)
/// </summary>
[Description("contains")]
Contains,
/// <summary>
/// Mask (=~)
/// </summary>
[Description("=~")]
Mask,
/// <summary>
/// None ("")
/// </summary>
[Description("")]
None,
}
/// <summary>
/// </summary>
public static class EnumHelper
{
/// <summary>
/// <see cref="GetDescription"/> of the enum
/// </summary>
/// <param name="enumValue"></param>
public static string GetDescription<T>(this T enumValue)
where T : struct, System.IConvertible
{
if (!typeof(T).IsEnum)
return null;
string description = enumValue.ToString();
System.Reflection.FieldInfo fieldInfo = enumValue.GetType().GetField(enumValue.ToString());
if (fieldInfo != null)
{
object[] attributes = fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), true);
if (attributes != null && attributes.Length > 0)
description = ((DescriptionAttribute)attributes[0]).Description;
}
return description;
}
}
/// <summary>
/// Filter interface specialized by filters in the protocol
/// </summary>
public abstract class IFilter
{
/// <summary>
/// Name of the filter
/// </summary>
public string Name;
/// <summary>
/// Operator of the filter
/// </summary>
public FilterOperator Operator;
/// <summary>
/// Value to test
/// </summary>
public string Value;
/// <summary>
/// If the expression is negated
/// </summary>
public bool Negation;
/// <summary>
/// Initializes a new instance of the <see cref="IFilter"/> class.
/// </summary>
/// <param name="Name">Name of the filter</param>
/// <param name="Operator">Operator of the filter</param>
/// <param name="Value">Value to test</param>
/// <param name="Negation">If the expression is negated</param>
public IFilter(string Name, FilterOperator Operator, string Value, bool Negation = false)
{
this.Name = Name;
this.Operator = Operator;
this.Value = Value;
this.Negation = Negation;
}
/// <summary>
/// Gets the formatted command
///
/// String values are quoted with single or double quotes,
/// and special characters within those values must be escaped with the backslash (\).
/// Keep in mind that the backslash is also the escape character on the protocol level,
/// which means you may need to use double backslash.
///
/// Example expression which matches an artist named foo'bar":
/// (Artist == "foo\'bar\"")
///
/// At the protocol level, the command must look like this:
/// find "(Artist == \"foo\\'bar\\\"\")"
///
/// (https://mpd.readthedocs.io/en/stable/protocol.html#filters)
/// </summary>
public string GetFormattedCommand()
{
string make = "";
if (Negation)
make += "(!";
make += "(" + Name + " ";
make += Operator.GetDescription();
make += " " + "\\\"" + Value + "\\\"" + ")";
if (Negation)
make += ")";
return make;
}
}
}