private void ProcessField(StringBuilder source, IndentUtil indent, IFieldSymbol fieldSymbol, ISymbol attributeSymbol)
{
// get the name and type of the field
string fieldName = fieldSymbol.Name;
ITypeSymbol fieldType = fieldSymbol.Type;
// get the AutoNotify attribute from the field, and any associated data
AttributeData attributeData = fieldSymbol.GetAttributes().Single(ad => ad.AttributeClass.Equals(attributeSymbol, SymbolEqualityComparer.Default));
TypedConstant overridenNameOpt = attributeData.NamedArguments.SingleOrDefault(kvp => kvp.Key == "PropertyName").Value;
string propertyName = chooseName(fieldName, overridenNameOpt);
if (propertyName.Length == 0 || propertyName == fieldName)
{
//TODO: issue a diagnostic that we can't process this field
return;
}
source.AppendLine($@"
{indent.Value}public {fieldType} {propertyName}
{indent.Value}{{
{indent.Value2}get
{indent.Value2}{{
{indent.Value3}return this.{fieldName};
{indent.Value2}}}
{indent.Value2}set
{indent.Value2}{{
{indent.Value3}this.{fieldName} = value;
{indent.Value3}this.PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs(nameof({propertyName})));
{indent.Value2}}}
{indent.Value}}}");
string chooseName(string fieldName, TypedConstant overridenNameOpt)
{
if (!overridenNameOpt.IsNull)
{
return(overridenNameOpt.Value.ToString());
}
fieldName = fieldName.TrimStart('_');
if (fieldName.Length == 0)
{
return(string.Empty);
}
if (fieldName.Length == 1)
{
return(fieldName.ToUpper());
}
return(fieldName.Substring(0, 1).ToUpper() + fieldName.Substring(1));
}
}
private string ProcessClass(INamedTypeSymbol classSymbol, List <IFieldSymbol> fields, ISymbol attributeSymbol, ISymbol notifySymbol, GeneratorExecutionContext context)
{
if (!classSymbol.ContainingSymbol.Equals(classSymbol.ContainingNamespace, SymbolEqualityComparer.Default))
{
return(null); //TODO: issue a diagnostic that it must be top level
}
var builder = new StringBuilder();
var indent = new IndentUtil();
var namespaceSymbol = classSymbol.ContainingNamespace;
if (!namespaceSymbol.IsGlobalNamespace)
{
builder.AppendLine($@"namespace {namespaceSymbol.Name}
{{");
indent.IncreaseSimple();
}
builder.AppendLine($@"
{indent.Value}public partial class {classSymbol.Name} : {notifySymbol.ToDisplayString()}
{indent.Value}{{");
using var marker = indent.Increase();
// if the class doesn't implement INotifyPropertyChanged already, add it
if (!classSymbol.Interfaces.Contains(notifySymbol))
{
builder.Append($"{indent.Value}public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;");
}
// create properties for each field
foreach (IFieldSymbol fieldSymbol in fields)
{
ProcessField(builder, indent, fieldSymbol, attributeSymbol);
}
marker.Revert();
builder.Append($"{indent.Value}}}");
if (!namespaceSymbol.IsGlobalNamespace)
{
indent.Decrease();
builder.AppendLine("}");
}
return(builder.ToString());
}
public Marker(IndentUtil indentUtil, int count)
{
_util = indentUtil;
_count = count;
}
