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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.PooledObjects;
using Microsoft.CodeAnalysis.Shared.Extensions;
namespace Microsoft.CodeAnalysis.CSharp.CodeGeneration;
using static CSharpCodeGenerationHelpers;
using static CSharpSyntaxTokens;
using static SyntaxFactory;
internal static class ParameterGenerator
{
public static ParameterListSyntax GenerateParameterList(
ImmutableArray<IParameterSymbol> parameterDefinitions,
bool isExplicit,
CSharpCodeGenerationContextInfo info)
{
var parameters = GetParameters(parameterDefinitions, isExplicit, info);
return ParameterList([.. parameters]);
}
public static BracketedParameterListSyntax GenerateBracketedParameterList(
ImmutableArray<IParameterSymbol> parameterDefinitions,
bool isExplicit,
CSharpCodeGenerationContextInfo info)
{
// Bracketed parameter lists come from indexers. Those don't have type parameters, so we
// could never have a typeParameterMapping.
var parameters = GetParameters(parameterDefinitions, isExplicit, info);
return BracketedParameterList([.. parameters]);
}
internal static ImmutableArray<ParameterSyntax> GetParameters(
ImmutableArray<IParameterSymbol> parameterDefinitions,
bool isExplicit,
CSharpCodeGenerationContextInfo info)
{
var seenOptional = false;
var isFirstParam = true;
var result = new FixedSizeArrayBuilder<ParameterSyntax>(parameterDefinitions.Length);
foreach (var p in parameterDefinitions)
{
var parameter = GetParameter(p, info, isExplicit, isFirstParam, seenOptional);
result.Add(parameter);
seenOptional = seenOptional || parameter.Default != null;
isFirstParam = false;
}
return result.MoveToImmutable();
}
internal static ParameterSyntax GetParameter(IParameterSymbol parameter, CSharpCodeGenerationContextInfo info, bool isExplicit, bool isFirstParam, bool seenOptional)
{
var reusableSyntax = GetReuseableSyntaxNodeForSymbol<ParameterSyntax>(parameter, info);
if (reusableSyntax != null)
return reusableSyntax;
return Parameter(parameter.Name.ToIdentifierToken())
.WithAttributeLists(GenerateAttributes(parameter, isExplicit, info))
.WithModifiers(GenerateModifiers(parameter, isFirstParam))
.WithType(parameter.Type.GenerateTypeSyntax())
.WithDefault(GenerateEqualsValueClause(info.Generator, parameter, isExplicit, seenOptional));
}
private static SyntaxTokenList GenerateModifiers(
IParameterSymbol parameter, bool isFirstParam)
{
var list = CSharpSyntaxGeneratorInternal.GetParameterModifiers(parameter.RefKind);
if (isFirstParam &&
parameter.ContainingSymbol is IMethodSymbol methodSymbol &&
methodSymbol.IsExtensionMethod)
{
list = list.Add(ThisKeyword);
}
if (parameter.IsParams)
{
list = list.Add(ParamsKeyword);
}
return list;
}
private static EqualsValueClauseSyntax? GenerateEqualsValueClause(
SyntaxGenerator generator,
IParameterSymbol parameter,
bool isExplicit,
bool seenOptional)
{
if (!parameter.IsParams && !isExplicit && !parameter.IsRefOrOut())
{
if (parameter.HasExplicitDefaultValue || seenOptional)
{
var defaultValue = parameter.HasExplicitDefaultValue ? parameter.ExplicitDefaultValue : null;
if (defaultValue is DateTime)
return null;
return EqualsValueClause(
GenerateEqualsValueClauseWorker(generator, parameter, defaultValue));
}
}
return null;
}
private static ExpressionSyntax GenerateEqualsValueClauseWorker(SyntaxGenerator generator, IParameterSymbol parameter, object? value)
=> ExpressionGenerator.GenerateExpression(generator, parameter.Type, value, canUseFieldReference: true);
private static SyntaxList<AttributeListSyntax> GenerateAttributes(
IParameterSymbol parameter, bool isExplicit, CSharpCodeGenerationContextInfo info)
{
if (isExplicit)
{
return default;
}
var attributes = parameter.GetAttributes();
if (attributes.Length == 0)
{
return default;
}
return AttributeGenerator.GenerateAttributeLists(attributes, info);
}
}
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