private static MemberDeclarationSyntax GenerateConstructor(WellKnownTypes wellKnownTypes, string className, List <FieldInfoMember> fields)
{
var body = new List <StatementSyntax>();
// Expressions for specifying binding flags.
var bindingFlags = SymbolSyntaxExtensions.GetBindingFlagsParenthesizedExpressionSyntax(
SyntaxKind.BitwiseOrExpression,
BindingFlags.Instance,
BindingFlags.NonPublic,
BindingFlags.Public);
var fieldUtils = IdentifierName("fieldUtils");
foreach (var field in fields)
{
// Get the field
var fieldInfoField = IdentifierName(field.InfoFieldName);
var fieldInfo =
InvocationExpression(TypeOfExpression(field.Field.ContainingType.ToTypeSyntax()).Member("GetField"))
.AddArgumentListArguments(
Argument(field.Field.Name.ToLiteralExpression()),
Argument(bindingFlags));
var fieldInfoVariable =
VariableDeclarator(field.InfoFieldName).WithInitializer(EqualsValueClause(fieldInfo));
if (!field.IsGettableProperty || !field.IsSettableProperty)
{
body.Add(LocalDeclarationStatement(
VariableDeclaration(wellKnownTypes.FieldInfo.ToTypeSyntax()).AddVariables(fieldInfoVariable)));
}
// Set the getter/setter of the field
if (!field.IsGettableProperty)
{
var getterType = wellKnownTypes.Func_2.Construct(field.Field.ContainingType, field.SafeType).ToTypeSyntax();
var getterInvoke = CastExpression(
getterType,
InvocationExpression(fieldUtils.Member("GetGetter")).AddArgumentListArguments(Argument(fieldInfoField)));
body.Add(ExpressionStatement(
AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, IdentifierName(field.GetterFieldName), getterInvoke)));
}
if (!field.IsSettableProperty)
{
if (field.Field.ContainingType != null && field.Field.ContainingType.IsValueType)
{
var setterType = wellKnownTypes.ValueTypeSetter_2.Construct(field.Field.ContainingType, field.SafeType).ToTypeSyntax();
var getValueSetterInvoke = CastExpression(
setterType,
InvocationExpression(fieldUtils.Member("GetValueSetter"))
.AddArgumentListArguments(Argument(fieldInfoField)));
body.Add(ExpressionStatement(
AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, IdentifierName(field.SetterFieldName), getValueSetterInvoke)));
}
else
{
var setterType = wellKnownTypes.Action_2.Construct(field.Field.ContainingType, field.SafeType).ToTypeSyntax();
var getReferenceSetterInvoke = CastExpression(
setterType,
InvocationExpression(fieldUtils.Member("GetReferenceSetter"))
.AddArgumentListArguments(Argument(fieldInfoField)));
body.Add(ExpressionStatement(
AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, IdentifierName(field.SetterFieldName), getReferenceSetterInvoke)));
}
}
}
return
(ConstructorDeclaration(className)
.AddModifiers(Token(SyntaxKind.PublicKeyword))
.AddParameterListParameters(
Parameter(fieldUtils.Identifier).WithType(wellKnownTypes.IFieldUtils.ToTypeSyntax()))
.AddBodyStatements(body.ToArray()));
}
private static ConstructorDeclarationSyntax GenerateConstructor(string simpleClassName, List <FieldDescription> fieldDescriptions)
{
var injected = fieldDescriptions.Where(f => f.IsInjected).ToList();
var parameters = injected.Select(f => Parameter(f.FieldName.ToIdentifier()).WithType(f.FieldType));
var fieldAccessorUtility = AliasQualifiedName("global", IdentifierName("Hagar")).Member("Utilities").Member("FieldAccessor");
IEnumerable <StatementSyntax> GetStatements()
{
foreach (var field in fieldDescriptions)
{
switch (field)
{
case GetterFieldDescription getter:
yield return(InitializeGetterField(getter));
break;
case SetterFieldDescription setter:
yield return(InitializeSetterField(setter));
break;
case FieldDescription _ when field.IsInjected:
yield return(ExpressionStatement(
AssignmentExpression(
SyntaxKind.SimpleAssignmentExpression,
ThisExpression().Member(field.FieldName.ToIdentifierName()),
Unwrapped(field.FieldName.ToIdentifierName()))));
break;
}
}
}
StatementSyntax InitializeGetterField(GetterFieldDescription getter)
{
var fieldInfo = GetFieldInfo(getter.Member.Field.ContainingType, getter.Member.Field.Name);
var accessorInvoke = CastExpression(
getter.FieldType,
InvocationExpression(fieldAccessorUtility.Member("GetGetter")).AddArgumentListArguments(Argument(fieldInfo)));
return(ExpressionStatement(
AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, IdentifierName(getter.FieldName), accessorInvoke)));
}
StatementSyntax InitializeSetterField(SetterFieldDescription setter)
{
var field = setter.Member.Field;
var fieldInfo = GetFieldInfo(field.ContainingType, field.Name);
var accessorMethod = setter.IsContainedByValueType ? "GetValueSetter" : "GetReferenceSetter";
var accessorInvoke = CastExpression(
setter.FieldType,
InvocationExpression(fieldAccessorUtility.Member(accessorMethod))
.AddArgumentListArguments(Argument(fieldInfo)));
return(ExpressionStatement(
AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, IdentifierName(setter.FieldName), accessorInvoke)));
}
InvocationExpressionSyntax GetFieldInfo(INamedTypeSymbol containingType, string fieldName)
{
var bindingFlags = SymbolSyntaxExtensions.GetBindingFlagsParenthesizedExpressionSyntax(
SyntaxKind.BitwiseOrExpression,
BindingFlags.Instance,
BindingFlags.NonPublic,
BindingFlags.Public);
return(InvocationExpression(TypeOfExpression(containingType.ToTypeSyntax()).Member("GetField"))
.AddArgumentListArguments(
Argument(fieldName.GetLiteralExpression()),
Argument(bindingFlags)));
}
return(ConstructorDeclaration(simpleClassName)
.AddModifiers(Token(SyntaxKind.PublicKeyword))
.AddParameterListParameters(parameters.ToArray())
.AddBodyStatements(GetStatements().ToArray()));
ExpressionSyntax Unwrapped(ExpressionSyntax expr)
{
return(InvocationExpression(
MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression, IdentifierName("HagarGeneratedCodeHelper"), IdentifierName("UnwrapService")),
ArgumentList(SeparatedList(new[] { Argument(ThisExpression()), Argument(expr) }))));
}
}
