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Add index signature keyword (#36)
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‎docs/en-US/about_Type_Signatures.help.md‎

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@@ -28,6 +28,7 @@ Type signatures are a custom query language built into PowerShell type expressio
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* [`interface`](#interface)
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* [`abstract`](#abstract)
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* [`concrete`](#concrete)
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* [`index`](#index)
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* [`number`](#number)
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* [`decoration`, `hasattr`](#decoration-hasattr)
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* [`generic`](#generic)
@@ -2734,6 +2735,261 @@ void Example(FileInfo value);
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</tr>
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</table>
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## `index`
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<sup>([Back to Top](#keywords))</sup>
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Matches only parameters in at a specific index in the method.
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<table>
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<tr>
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<td colspan="2" width="1000">
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```powershell
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Find-Member -ParameterType { [allof[index0, string]] }
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```
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</td>
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</tr>
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<tr>
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<th width="1">
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</th>
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<th>
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Signature
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</th>
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</tr>
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<tr>
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<td width="1">
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:x:
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</td>
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<td>
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```csharp
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void Example(IDisposable disposable);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:heavy_check_mark:
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</td>
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<td>
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```csharp
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void Example(string str);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:x:
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</td>
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<td>
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```csharp
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void Example(int value, string str);
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```
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td colspan="2" width="1000">
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```powershell
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Find-Member -ParameterType { [allof[index1.., string]] }
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```
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</td>
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</tr>
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<tr>
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<th width="1">
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</th>
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<th>
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Signature
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</th>
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</tr>
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<tr>
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<td width="1">
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:x:
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</td>
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<td>
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```csharp
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void Example(IDisposable disposable);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:x:
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</td>
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<td>
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```csharp
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void Example(string str);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:heavy_check_mark:
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</td>
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<td>
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```csharp
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void Example(int value, string str);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:heavy_check_mark:
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</td>
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<td>
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```csharp
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void Example(int value, object obj, string str);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:heavy_check_mark:
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</td>
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<td>
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```csharp
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void Example(string value, object obj, string str);
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```
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td colspan="2" width="1000">
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```powershell
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# You can also use `i`
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Find-Member -ParameterType { [allof[i0..1, string]] }
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```
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</td>
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</tr>
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<tr>
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<th width="1">
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</th>
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<th>
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Signature
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</th>
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</tr>
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<tr>
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<td width="1">
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:x:
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</td>
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<td>
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```csharp
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void Example(IDisposable disposable);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:heavy_check_mark:
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</td>
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<td>
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```csharp
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void Example(string str);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:heavy_check_mark:
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</td>
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<td>
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```csharp
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void Example(int value, string str);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:x:
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</td>
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<td>
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```csharp
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void Example(int value, object obj, string str);
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```
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</td>
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</tr>
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<tr>
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<td width="1">
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:heavy_check_mark:
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</td>
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<td>
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```csharp
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void Example(string value, object obj, string str);
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```
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</td>
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</tr>
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</table>
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## `number`
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<sup>([Back to Top](#keywords))</sup>

‎src/ClassExplorer/Signatures/ParameterIndexSignature.cs‎

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using System;
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using System.Reflection;
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namespace ClassExplorer.Signatures;
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internal sealed class ParameterIndexSignature : TypeSignature
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{
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public ParameterIndexSignature(RangeExpression range)
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{
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Poly.Assert(range is not null);
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Range = range;
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}
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public RangeExpression Range { get; }
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public override bool IsMatch(Type type) => false;
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public override bool IsMatch(ParameterInfo parameter) => Range.IsInRange(parameter.Position);
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}

‎src/ClassExplorer/Signatures/SignatureParser.cs‎

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@@ -4,7 +4,6 @@
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using System.Collections.ObjectModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Management.Automation;
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using System.Management.Automation.Language;
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using System.Reflection;
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return CreateGenericSignature(kind, position, args);
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}
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if (IsIndex(nameAsLower.AsSpan(), out RangeExpression? indexRange))
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{
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argsConsumed = false;
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return new ParameterIndexSignature(indexRange);
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}
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argsConsumed = false;
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return nameAsLower switch
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{
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throw new SignatureParseException(message, extent);
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}
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private static bool IsIndex(ReadOnlySpan<char> typeName, [NotNullWhen(true)] out RangeExpression? range)
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{
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if (typeName is ['i', ..ReadOnlySpan<char> rest])
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{
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if (rest is ['n', 'd', 'e', 'x', ..ReadOnlySpan<char> afterIndex])
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{
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rest = afterIndex;
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}
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return RangeExpression.TryParse(rest, out range);
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}
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range = null;
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return false;
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}
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private static bool IsGenericParameter(TypeName typeName, out GenericParameterKind kind, out int position)
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{
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string name = typeName.Name;

‎tools/Signatures.yaml‎

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- match: true
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sig: void Example(FileInfo value);
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- header: "`index`"
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description: Matches only parameters in at a specific index in the method.
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examples:
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- syntax: Find-Member -ParameterType { [allof[index0, string]] }
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signatures:
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- match: false
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sig: void Example(IDisposable disposable);
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- match: true
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sig: void Example(string str);
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- match: false
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sig: void Example(int value, string str);
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- syntax: Find-Member -ParameterType { [allof[index1.., string]] }
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signatures:
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- match: false
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sig: void Example(IDisposable disposable);
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- match: false
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sig: void Example(string str);
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- match: true
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sig: void Example(int value, string str);
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- match: true
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sig: void Example(int value, object obj, string str);
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- match: true
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sig: void Example(string value, object obj, string str);
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- syntax: "# You can also use `i`\n
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Find-Member -ParameterType { [allof[i0..1, string]] }"
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signatures:
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- match: false
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sig: void Example(IDisposable disposable);
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- match: true
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sig: void Example(string str);
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- match: true
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sig: void Example(int value, string str);
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- match: false
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sig: void Example(int value, object obj, string str);
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- match: true
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sig: void Example(string value, object obj, string str);
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- header: "`number`"
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description: Matches a hard coded list of types representing numbers.
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examples:

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