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feat: use IEnumerable constructors where possible (#342)
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src/Riok.Mapperly/Descriptors/Mappings/LinqConstructorMapping.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| using Microsoft.CodeAnalysis; | ||
| using Microsoft.CodeAnalysis.CSharp.Syntax; | ||
| using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory; | ||
| using static Riok.Mapperly.Emit.SyntaxFactoryHelper; | ||
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| namespace Riok.Mapperly.Descriptors.Mappings; | ||
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| /// <summary> | ||
| /// Represents an enumerable mapping where the target type accepts IEnumerable as a single argument. | ||
| /// </summary> | ||
| public class LinqConstructorMapping : TypeMapping | ||
| { | ||
| private const string LambdaParamName = "x"; | ||
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| private readonly ITypeMapping _elementMapping; | ||
| private readonly IMethodSymbol? _selectMethod; | ||
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| public LinqConstructorMapping( | ||
| ITypeSymbol sourceType, | ||
| ITypeSymbol targetType, | ||
| ITypeMapping elementMapping, | ||
| IMethodSymbol? selectMethod) | ||
| : base(sourceType, targetType) | ||
| { | ||
| _elementMapping = elementMapping; | ||
| _selectMethod = selectMethod; | ||
| } | ||
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| public override ExpressionSyntax Build(TypeMappingBuildContext ctx) | ||
| { | ||
| var lambdaParamName = ctx.NameBuilder.New(LambdaParamName); | ||
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| ExpressionSyntax mappedSource; | ||
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| // Select / Map if needed | ||
| if (_selectMethod != null) | ||
| { | ||
| var sourceMapExpression = _elementMapping.Build(ctx.WithSource(lambdaParamName)); | ||
| var convertLambda = SimpleLambdaExpression(Parameter(Identifier(lambdaParamName))) | ||
| .WithExpressionBody(sourceMapExpression); | ||
| mappedSource = StaticInvocation(_selectMethod, ctx.Source, convertLambda); | ||
| } | ||
| else | ||
| { | ||
| mappedSource = _elementMapping.Build(ctx); | ||
| } | ||
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| return CreateInstance(TargetType, mappedSource); | ||
| } | ||
| } |
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