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| 1 | +using Microsoft.CodeAnalysis.CSharp.Syntax; |
| 2 | +using Microsoft.CodeAnalysis; |
| 3 | + |
| 4 | +namespace RoyalCode.SmartSelector.Generators.Generators; |
| 5 | + |
| 6 | +internal static class AttributeSyntaxExtensions |
| 7 | +{ |
| 8 | + public static IEnumerable<string> GetConstructorStrings(this AttributeSyntax attr) |
| 9 | + { |
| 10 | + if (attr.ArgumentList is not { Arguments.Count: > 0 }) yield break; |
| 11 | + foreach (var arg in attr.ArgumentList.Arguments) |
| 12 | + { |
| 13 | + if (arg.NameEquals is not null) continue; // skip named |
| 14 | + if (TryReadSingle(arg.Expression, out var value)) |
| 15 | + yield return value; |
| 16 | + else if (arg.Expression is ArrayCreationExpressionSyntax acs && acs.Initializer is not null) |
| 17 | + { |
| 18 | + foreach (var expr in acs.Initializer.Expressions) |
| 19 | + if (TryReadSingle(expr, out var v)) yield return v; |
| 20 | + } |
| 21 | + else if (arg.Expression is ImplicitArrayCreationExpressionSyntax iacs && iacs.Initializer is not null) |
| 22 | + { |
| 23 | + foreach (var expr in iacs.Initializer.Expressions) |
| 24 | + if (TryReadSingle(expr, out var v)) yield return v; |
| 25 | + } |
| 26 | + else if (arg.Expression is InitializerExpressionSyntax init) |
| 27 | + { |
| 28 | + foreach (var expr in init.Expressions) |
| 29 | + if (TryReadSingle(expr, out var v)) yield return v; |
| 30 | + } |
| 31 | + } |
| 32 | + } |
| 33 | + |
| 34 | + public static IEnumerable<string> GetConstructorStringSet(this AttributeSyntax attr) |
| 35 | + => attr.GetConstructorStrings().Distinct(StringComparer.Ordinal); |
| 36 | + |
| 37 | + public static IEnumerable<string> GetNamedArgumentStrings(this AttributeSyntax attr, string name) |
| 38 | + { |
| 39 | + if (attr.ArgumentList is not { Arguments.Count: > 0 }) yield break; |
| 40 | + foreach (var arg in attr.ArgumentList.Arguments) |
| 41 | + { |
| 42 | + if (arg.NameEquals?.Name.Identifier.Text != name) continue; |
| 43 | + var expr = arg.Expression; |
| 44 | + if (TryReadSingle(expr, out var value)) |
| 45 | + { |
| 46 | + yield return value; |
| 47 | + continue; |
| 48 | + } |
| 49 | + if (expr is ArrayCreationExpressionSyntax acs && acs.Initializer is not null) |
| 50 | + { |
| 51 | + foreach (var item in acs.Initializer.Expressions) |
| 52 | + if (TryReadSingle(item, out var v)) yield return v; |
| 53 | + } |
| 54 | + else if (expr is ImplicitArrayCreationExpressionSyntax iacs && iacs.Initializer is not null) |
| 55 | + { |
| 56 | + foreach (var item in iacs.Initializer.Expressions) |
| 57 | + if (TryReadSingle(item, out var v)) yield return v; |
| 58 | + } |
| 59 | + else if (expr is InitializerExpressionSyntax init) |
| 60 | + { |
| 61 | + foreach (var item in init.Expressions) |
| 62 | + if (TryReadSingle(item, out var v)) yield return v; |
| 63 | + } |
| 64 | + } |
| 65 | + } |
| 66 | + |
| 67 | + public static IEnumerable<string> GetNamedArgumentStringSet(this AttributeSyntax attr, string name) |
| 68 | + => attr.GetNamedArgumentStrings(name).Distinct(StringComparer.Ordinal); |
| 69 | + |
| 70 | + private static bool TryReadSingle(ExpressionSyntax expr, out string value) |
| 71 | + { |
| 72 | + switch (expr) |
| 73 | + { |
| 74 | + case LiteralExpressionSyntax { Token.Value: string s }: |
| 75 | + value = s; return true; |
| 76 | + case InvocationExpressionSyntax { Expression: IdentifierNameSyntax id } inv when id.Identifier.Text == "nameof": |
| 77 | + if (inv.ArgumentList.Arguments.Count == 1) |
| 78 | + { |
| 79 | + var inner = inv.ArgumentList.Arguments[0].Expression; |
| 80 | + if (inner is IdentifierNameSyntax ins) |
| 81 | + { value = ins.Identifier.Text; return true; } |
| 82 | + if (inner is MemberAccessExpressionSyntax ma) |
| 83 | + { value = ma.Name.Identifier.Text; return true; } |
| 84 | + } |
| 85 | + break; |
| 86 | + } |
| 87 | + value = string.Empty; return false; |
| 88 | + } |
| 89 | +} |
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