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C# Add relational patterns extraction

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This commit is contained in:
Tamas Vajk
2021-01-14 11:50:20 +01:00
parent 545451e602
commit f235a28295
12 changed files with 174 additions and 1 deletions
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3
csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Patterns/Pattern.cs
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@@ -45,6 +45,9 @@ namespace Semmle.Extraction.CSharp.Entities.Expressions
case RecursivePatternSyntax recPattern:
return new RecursivePattern(cx, recPattern, parent, child);
case RelationalPatternSyntax relPattern:
return new RelationalPattern(cx, relPattern, parent, child);
case VarPatternSyntax varPattern:
switch (varPattern.Designation)
{

1
csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Patterns/RecursivePattern.cs
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@@ -15,7 +15,6 @@ namespace Semmle.Extraction.CSharp.Entities.Expressions
/// <param name="syntax">The syntax node of the recursive pattern.</param>
/// <param name="parent">The parent pattern/expression.</param>
/// <param name="child">The child index of this pattern.</param>
/// <param name="isTopLevel">If this pattern is in the top level of a case/is. In that case, the variable and type access are populated elsewhere.</param>
public RecursivePattern(Context cx, RecursivePatternSyntax syntax, IExpressionParentEntity parent, int child) :
base(new ExpressionInfo(cx, Entities.NullType.Create(cx), cx.Create(syntax.GetLocation()), ExprKind.RECURSIVE_PATTERN, parent, child, false, null))
{

29
csharp/extractor/Semmle.Extraction.CSharp/Entities/Expressions/Patterns/RelationalPattern.cs Normal file
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@@ -0,0 +1,29 @@
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.CSharp;
using Semmle.Extraction.Kinds;
using Semmle.Extraction.Entities;
namespace Semmle.Extraction.CSharp.Entities.Expressions
{
internal class RelationalPattern : Expression
{
public RelationalPattern(Context cx, RelationalPatternSyntax syntax, IExpressionParentEntity parent, int child) :
base(new ExpressionInfo(cx, NullType.Create(cx), cx.Create(syntax.GetLocation()), GetKind(syntax.OperatorToken), parent, child, false, null))
{
Expression.Create(cx, syntax.Expression, this, 0);
}
private static ExprKind GetKind(SyntaxToken operatorToken)
{
return operatorToken.Kind() switch
{
SyntaxKind.LessThanEqualsToken => ExprKind.LE_PATTERN,
SyntaxKind.GreaterThanEqualsToken => ExprKind.GE_PATTERN,
SyntaxKind.LessThanToken => ExprKind.LT_PATTERN,
SyntaxKind.GreaterThanToken => ExprKind.GT_PATTERN,
_ => throw new InternalError(operatorToken.Parent, $"Relation pattern with operator token '{operatorToken.Kind()}' is not supported."),
};
}
}
}

4
csharp/extractor/Semmle.Extraction.CSharp/Kinds/ExprKind.cs
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@@ -116,6 +116,10 @@ namespace Semmle.Extraction.Kinds
ASSIGN_COALESCE = 119,
SUPPRESS_NULLABLE_WARNING = 120,
NAMESPACE_ACCESS = 121,
LT_PATTERN = 122,
GT_PATTERN = 123,
LE_PATTERN = 124,
GE_PATTERN = 125,
NOT_PATTERN = 126
}
}