Don't add additional newline before middle attribute scenario

src/Fantomas.Tests/TypeDeclarationTests.fs

@@ -1345,3 +1345,49 @@ type Message =
     { [<JsonProperty("body")>]
       Body: string }
 """
+
+[<Test>]
+let ``attribute on abstract member followed by type with attribute, 933`` () =
+    formatSourceString false """
+[<AllowNullLiteral>]
+type SubGroupStackOptions =
+    [<Emit "$0[$1]{{=$2}}">]
+    abstract Item: name:string -> bool with get, set
+
+[<AllowNullLiteral>]
+type DataGroup =
+    abstract className: string option with get, set
+"""  config
+    |> prepend newline
+    |> should equal """
+[<AllowNullLiteral>]
+type SubGroupStackOptions =
+    [<Emit "$0[$1]{{=$2}}">]
+    abstract Item: name:string -> bool with get, set
+
+[<AllowNullLiteral>]
+type DataGroup =
+    abstract className: string option with get, set
+"""
+
+[<Test>]
+let ``attribute on abstract member followed by let binding with attribute`` () =
+    formatSourceString false """
+[<AllowNullLiteral>]
+type SubGroupStackOptions =
+    [<Emit "$0[$1]{{=$2}}">]
+    abstract Item: name:string -> bool with get, set
+
+[<AllowNullLiteral>]
+let foo bar = zero
+"""  config
+    |> prepend newline
+    |> should equal """
+[<AllowNullLiteral>]
+type SubGroupStackOptions =
+    [<Emit "$0[$1]{{=$2}}">]
+    abstract Item: name:string -> bool with get, set
+
+[<AllowNullLiteral>]
+let foo bar = zero
+"""

src/Fantomas/AstTransformer.fs

@@ -69,7 +69,7 @@ module private Ast =
              FsAstNode = modOrNs
              Childs =
                  [yield! (if isModule = SynModuleOrNamespaceKind.DeclaredNamespace then collectIdents longIdent else [])
-                  yield! attrs |> List.map visitSynAttributeList
+                  yield! attrs |> List.map (visitSynAttributeList modOrNs)
                   yield! (decls |> List.map visitSynModuleDecl)]}
 
     and visitSynModuleDecl(ast: SynModuleDecl) : Node =
@@ -125,7 +125,7 @@ module private Ast =
              Range = r range
              Properties = p []
              FsAstNode = ast
-             Childs = attrs |> List.map visitSynAttributeList}
+             Childs = attrs |> List.map (visitSynAttributeList ast)}
         | SynModuleDecl.HashDirective(hash,range) ->
             {Type = "SynModuleDecl.HashDirective"
              Range = r range
@@ -810,7 +810,7 @@ module private Ast =
                     if access.IsSome then yield "access" ==> (access.Value |> visitSynAccess)]
              FsAstNode = mbrDef
              Childs =
-                 [yield! attrs |> List.map visitSynAttributeList
+                 [yield! attrs |> List.map (visitSynAttributeList mbrDef)
                   yield visitSynSimplePats ctorArgs]}
         | SynMemberDefn.ImplicitInherit(inheritType,inheritArgs,inheritAlias,range) ->
             {Type = "SynMemberDefn.ImplicitInherit"
@@ -871,7 +871,7 @@ module private Ast =
                     if getSetRange.IsSome then yield "getSetRange" ==> (getSetRange.Value |> r)]
              FsAstNode = mbrDef
              Childs =
-                 [yield! attrs |> List.map visitSynAttributeList
+                 [yield! attrs |> List.map (visitSynAttributeList mbrDef)
                   if typeOpt.IsSome then yield visitSynType typeOpt.Value
                   yield visitSynExpr synExpr]}
 
@@ -902,7 +902,7 @@ module private Ast =
              FsAstNode = sp
              Childs =
                  [yield visitSynSimplePat simplePat
-                  yield! attrs |> List.map visitSynAttributeList]}
+                  yield! attrs |> List.map (visitSynAttributeList sp)]}
 
     and visitSynSimplePats(sp: SynSimplePats): Node =
         match sp with
@@ -933,7 +933,7 @@ module private Ast =
                     if access.IsSome then yield "access" ==> (access.Value |> visitSynAccess)]
              FsAstNode = binding
              Childs =
-                 [yield! attrs |> List.map visitSynAttributeList
+                 [yield! attrs |> List.map (visitSynAttributeList binding)
                   yield visitSynValData valData
                   yield visitSynPat headPat
                   if returnInfo.IsSome then yield visitSynBindingReturnInfo returnInfo.Value
@@ -960,7 +960,7 @@ module private Ast =
                     if access.IsSome then yield "access" ==> (access.Value |> visitSynAccess)]
              FsAstNode = svs
              Childs =
-                 [yield! attrs |> List.map visitSynAttributeList
+                 [yield! attrs |> List.map (visitSynAttributeList svs)
                   yield visitSynValTyparDecls explicitValDecls
                   yield visitSynType synType
                   yield visitSynValInfo arity
@@ -983,7 +983,7 @@ module private Ast =
              Properties = p []
              FsAstNode = std
              Childs =
-                 [yield! attrs |> List.map visitSynAttributeList
+                 [yield! attrs |> List.map (visitSynAttributeList std)
                   yield visitSynTypar typar]}
 
     and visitSynTypar(typar: SynTypar): Node =
@@ -1012,7 +1012,7 @@ module private Ast =
              FsAstNode = returnInfo
              Childs =
                  [yield visitSynType typeName
-                  yield! (attrs |> List.map visitSynAttributeList)]}
+                  yield! (attrs |> List.map (visitSynAttributeList returnInfo))]}
 
     and visitSynPat(sp: SynPat): Node =
         match sp with
@@ -1052,7 +1052,7 @@ module private Ast =
              FsAstNode = sp
              Childs =
                  [yield visitSynPat synPat
-                  yield! attrs |> List.map visitSynAttributeList]}
+                  yield! attrs |> List.map (visitSynAttributeList sp)]}
         | SynPat.Or(synPat,synPat2,range) ->
             {Type = "SynPat.Or"
              Range = r range
@@ -1177,7 +1177,7 @@ module private Ast =
                     if access.IsSome then yield "access" ==> (access.Value |> visitSynAccess)]
              FsAstNode = sci
              Childs =
-                 [yield! (attribs |> List.map visitSynAttributeList)
+                 [yield! (attribs |> List.map (visitSynAttributeList sci))
                   yield! (typeParams |> List.map(visitSynTyparDecl))]}
 
     and visitSynTypeDefnRepr(stdr: SynTypeDefnRepr): Node =
@@ -1346,7 +1346,7 @@ module private Ast =
                     if access.IsSome then yield "access" ==> (access.Value |> visitSynAccess)]
              FsAstNode = sedr
              Childs =
-                 [yield! attrs |> List.map visitSynAttributeList
+                 [yield! attrs |> List.map (visitSynAttributeList sedr)
                   yield visitSynUnionCase unionCase]}
 
     and visitSynAttribute(attr: SynAttribute): Node =
@@ -1360,10 +1360,10 @@ module private Ast =
          FsAstNode = attr
          Childs = [visitSynExpr attr.ArgExpr]}
 
-    and visitSynAttributeList(attrs: SynAttributeList): Node =
+    and visitSynAttributeList (parent:obj) (attrs: SynAttributeList): Node =
         {Type = "SynAttributeList"
          Range = r attrs.Range
-         Properties = p []
+         Properties = p ["parent", parent]
          FsAstNode = attrs
          Childs = attrs.Attributes |> List.map visitSynAttribute
         }
@@ -1379,7 +1379,7 @@ module private Ast =
              FsAstNode = uc
              Childs =
                  [yield visitSynUnionCaseType uct
-                  yield! attrs |> List.map visitSynAttributeList]}
+                  yield! attrs |> List.map (visitSynAttributeList uc)]}
 
     and visitSynUnionCaseType(uct: SynUnionCaseType) =
         match uct with
@@ -1405,7 +1405,7 @@ module private Ast =
              Range = r range
              Properties = p []
              FsAstNode = sec
-             Childs = [yield! attrs |> List.map visitSynAttributeList; yield visitIdent ident]}
+             Childs = [yield! attrs |> List.map (visitSynAttributeList sec); yield visitIdent ident]}
 
     and visitSynField(sfield: SynField): Node =
         match sfield with
@@ -1418,7 +1418,7 @@ module private Ast =
                     if access.IsSome then yield "access" ==> (access.Value |> visitSynAccess)]
              FsAstNode = sfield
              Childs =
-                 [yield! attrs |> List.map visitSynAttributeList
+                 [yield! attrs |> List.map (visitSynAttributeList sfield)
                   yield visitSynType typ]}
 
     and visitSynType(st: SynType) =
@@ -1566,7 +1566,7 @@ module private Ast =
                  p [if ident.IsSome then yield "ident" ==> i ident.Value
                     yield "optional" ==> optional]
              FsAstNode = sai
-             Childs = [yield! attrs |> List.map visitSynAttributeList]}
+             Childs = [yield! attrs |> List.map (visitSynAttributeList sai)]}
 
     and visitSynAccess(a: SynAccess) =
         match a with
@@ -1613,7 +1613,7 @@ module private Ast =
              FsAstNode = modOrNs
              Childs =
                  [yield! (if isModule = SynModuleOrNamespaceKind.DeclaredNamespace then visitLongIdent longIdent else [])
-                  yield! attrs |> List.map visitSynAttributeList
+                  yield! attrs |> List.map (visitSynAttributeList modOrNs)
                   yield! (decls |> List.map visitSynModuleSigDecl)]}
 
     and visitSynModuleSigDecl(ast: SynModuleSigDecl) : Node =

src/Fantomas/Trivia.fs

@@ -146,7 +146,9 @@ let private findConstNodeAfter (nodes: TriviaNodeAssigner list) (range: range) =
 
 let private mapNodeToTriviaNode (node: Node) =
     node.Range
-    |> Option.map (fun range -> TriviaNodeAssigner(MainNode(node.Type), range))
+    |> Option.map (fun range ->
+        let attributeParent = Map.tryFind "parent" node.Properties
+        TriviaNodeAssigner(MainNode(node.Type), range, attributeParent))
 
 let private commentIsAfterLastTriviaNode (triviaNodes: TriviaNodeAssigner list) (range: range) =
     match List.filter isMainNodeButNotAnonModule triviaNodes with
@@ -223,7 +225,11 @@ let private triviaBetweenAttributeAndParentBinding (triviaNodes: TriviaNodeAssig
         | a, p when (a.Type = MainNode("SynAttributeList") && a.Range.StartLine < line && a.Range.StartLine = a.Range.EndLine) ->
             match p.Type with
               | MainNode("SynModuleDecl.Let") when (p.Range.StartLine > line) -> true
-              | MainNode("SynAttributeList") when (p.Range.StartLine > line) -> true
+              | MainNode("SynAttributeList") when (p.Range.StartLine > line) ->
+                  // This is an edge case scenario where the trivia needs to fit between two attributes of the same parent node.
+                  match p.AttributeParent, a.AttributeParent with
+                  | Some pp, Some ap -> pp = ap
+                  | _ -> false
               | MainNode("SynModuleDecl.Types") when (p.Range.StartLine > line) -> true
               | _ -> false
         | _ -> false)

src/Fantomas/TriviaTypes.fs

@@ -57,9 +57,10 @@ type TriviaNode =
     ContentAfter: TriviaContent list
     Range: range }
 
-type internal TriviaNodeAssigner(nodeType: TriviaNodeType, range: range) =
+type internal TriviaNodeAssigner(nodeType: TriviaNodeType, range: range, ?attributeParent: obj) =
     member this.Type = nodeType
     member this.Range = range
+    member this.AttributeParent = attributeParent
     member val ContentBefore = ResizeArray<TriviaContent>() with get,set
     member val ContentItself = Option<TriviaContent>.None with get,set
     member val ContentAfter = ResizeArray<TriviaContent>() with get,set