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C#: Add extractor support for list- and slice patterns.

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This commit is contained in:
Michael Nebel
2022-12-07 16:26:28 +01:00
parent 00354a2f08
commit cfd3c1fcbe
4 changed files with 51 additions and 0 deletions
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15
csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Patterns/ListPattern.cs Normal file
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@@ -0,0 +1,15 @@
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Semmle.Extraction.Kinds;
using Semmle.Util;
namespace Semmle.Extraction.CSharp.Entities.Expressions
{
internal class ListPattern : Expression
{
internal ListPattern(Context cx, ListPatternSyntax syntax, IExpressionParentEntity parent, int child) :
base(new ExpressionInfo(cx, null, cx.CreateLocation(syntax.GetLocation()), ExprKind.LIST_PATTERN, parent, child, false, null))
{
syntax.Patterns.ForEach((p, i) => Pattern.Create(cx, p, this, i));
}
}
}

6
csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Patterns/Pattern.cs
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@@ -74,6 +74,12 @@ namespace Semmle.Extraction.CSharp.Entities.Expressions
case DiscardPatternSyntax dp:
return new Discard(cx, dp, parent, child);
case ListPatternSyntax listPattern:
return new ListPattern(cx, listPattern, parent, child);
case SlicePatternSyntax slicePattern:
return new SlicePattern(cx, slicePattern, parent, child);
default:
throw new InternalError(syntax, "Pattern not handled");
}

17
csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Patterns/SlicePattern.cs Normal file
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@@ -0,0 +1,17 @@
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Semmle.Extraction.Kinds;
namespace Semmle.Extraction.CSharp.Entities.Expressions
{
internal class SlicePattern : Expression
{
public SlicePattern(Context cx, SlicePatternSyntax syntax, IExpressionParentEntity parent, int child) :
base(new ExpressionInfo(cx, null, cx.CreateLocation(syntax.GetLocation()), ExprKind.SLICE_PATTERN, parent, child, false, null))
{
if (syntax.Pattern is not null)
{
Pattern.Create(cx, syntax.Pattern, this, 0);
}
}
}
}

13
csharp/extractor/Semmle.Util/IEnumerableExtensions.cs
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@@ -79,6 +79,19 @@ namespace Semmle.Util
a(item);
}
/// <summary>
/// Applies the action <paramref name="a"/> to each item and its index in this collection.
/// </summary>
public static void ForEach<T>(this IEnumerable<T> items, Action<T, int> a)
{
var i = 0;
foreach (var item in items)
{
a(item, i);
i++;
}
}
/// <summary>
/// Forces enumeration of this collection and discards the result.
/// </summary>