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CodePrinter.fs
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CodePrinter.fs
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module internal Fantomas.CodePrinter
open System
open System.Text.RegularExpressions
open FSharp.Compiler.Range
open FSharp.Compiler.SourceCodeServices
open FSharp.Compiler.SyntaxTree
open Fantomas
open Fantomas.FormatConfig
open Fantomas.SourceParser
open Fantomas.SourceTransformer
open Fantomas.Context
open Fantomas.TriviaTypes
open Fantomas.TriviaContext
/// This type consists of contextual information which is important for formatting
type ASTContext =
{
/// Original file name without extension of the parsed AST
TopLevelModuleName: string
/// Current node is the first child of its parent
IsFirstChild: bool
/// Current node is a subnode deep down in an interface
InterfaceRange: range option
/// This pattern matters for formatting extern declarations
IsCStylePattern: bool
/// Range operators are naked in 'for..in..do' constructs
IsNakedRange: bool
/// The optional `|` in pattern matching and union type definitions
HasVerticalBar: bool
/// A field is rendered as union field or not
IsUnionField: bool
/// First type param might need extra spaces to avoid parsing errors on `<^`, `<'`, etc.
IsFirstTypeParam: bool
/// Check whether the context is inside DotGet to suppress whitespaces
IsInsideDotGet: bool
/// Check whether the context is inside a SynMemberDefn.Member(memberDefn,range)
/// This is required to correctly detect the setting SpaceBeforeMember
IsMemberDefinition: bool
}
static member Default =
{ TopLevelModuleName = ""
IsFirstChild = false; InterfaceRange = None
IsCStylePattern = false; IsNakedRange = false
HasVerticalBar = false; IsUnionField = false
IsFirstTypeParam = false; IsInsideDotGet = false
IsMemberDefinition = false }
let rec addSpaceBeforeParensInFunCall functionOrMethod arg (ctx:Context) =
match functionOrMethod, arg with
| SynExpr.TypeApp(e, _, _, _, _, _, _), _ ->
addSpaceBeforeParensInFunCall e arg ctx
| SynExpr.Paren _, _ ->
true
| UppercaseSynExpr, ConstExpr(Const "()", _) ->
ctx.Config.SpaceBeforeUppercaseInvocation
| LowercaseSynExpr, ConstExpr(Const "()", _) ->
ctx.Config.SpaceBeforeLowercaseInvocation
| SynExpr.Ident(_), SynExpr.Ident(_) ->
true
| UppercaseSynExpr, Paren(_) ->
ctx.Config.SpaceBeforeUppercaseInvocation
| LowercaseSynExpr, Paren(_) ->
ctx.Config.SpaceBeforeLowercaseInvocation
| _ -> true
let addSpaceBeforeParensInFunDef (astContext: ASTContext) (functionOrMethod:string) args (ctx:Context) =
let isLastPartUppercase =
let parts = functionOrMethod.Split '.'
Char.IsUpper parts.[parts.Length - 1].[0]
match functionOrMethod, args with
| "new", _ -> false
| _, PatParen(_) ->
if astContext.IsMemberDefinition
then ctx.Config.SpaceBeforeMember
else ctx.Config.SpaceBeforeParameter
| (_:string), _ -> not isLastPartUppercase
| _ -> true
let rec genParsedInput astContext = function
| ImplFile im -> genImpFile astContext im
| SigFile si -> genSigFile astContext si
(*
See https://github.com/fsharp/FSharp.Compiler.Service/blob/master/src/fsharp/ast.fs#L1518
hs = hashDirectives : ParsedHashDirective list
mns = modules : SynModuleOrNamespace list
*)
and genImpFile astContext (ParsedImplFileInput(hs, mns)) =
col sepNone hs genParsedHashDirective +> (if hs.IsEmpty then sepNone else sepNln)
+> col sepNln mns (genModuleOrNamespace astContext)
and genSigFile astContext (ParsedSigFileInput(hs, mns)) =
col sepNone hs genParsedHashDirective +> (if hs.IsEmpty then sepNone else sepNln)
+> col sepNln mns (genSigModuleOrNamespace astContext)
and genParsedHashDirective (ParsedHashDirective(h, s, r)) =
let printArgument arg =
match arg with
| "" -> sepNone
// Use verbatim string to escape '\' correctly
| _ when arg.Contains("\\") -> !- (sprintf "@\"%O\"" arg)
| _ -> !- (sprintf "\"%O\"" arg)
let printIdent (ctx:Context) =
ctx.Trivia
|> List.tryFind (fun t -> t.Range = r)
|> Option.bind(fun t -> t.ContentBefore
|> List.choose (fun tc ->
match tc with
| Keyword({ TokenInfo = {TokenName = "KEYWORD_STRING"}; Content = c }) -> Some c
| _ -> None)
|> List.tryHead)
|> function
| Some kw -> !- kw
| None -> col sepSpace s printArgument
<| ctx
!- "#" -- h +> sepSpace +> printIdent
|> genTrivia r
and genModuleOrNamespace astContext (ModuleOrNamespace(ats, px, ao, s, mds, isRecursive, moduleKind) as node) =
let sepModuleAndFirstDecl =
let firstDecl = List.tryHead mds
match firstDecl with
| None -> rep 2 sepNln
| Some mdl ->
let attrRanges = getRangesFromAttributesFromModuleDeclaration mdl
sepNlnConsideringTriviaContentBeforeWithAttributes mdl.Range attrRanges +> sepNln
let genTriviaForLongIdent (f: Context -> Context) =
match node with
| SynModuleOrNamespace.SynModuleOrNamespace(lid,_, SynModuleOrNamespaceKind.DeclaredNamespace,_,_,_,_,_) ->
lid
|> List.fold (fun (acc: Context -> Context) (ident:Ident) -> acc |> (genTrivia ident.idRange)) f
| _ -> f
let moduleOrNamespace = ifElse moduleKind.IsModule (!- "module ") (!- "namespace ")
let recursive = ifElse isRecursive (!- "rec ") sepNone
let namespaceFn = ifElse (s = "") (!- "global") (!- s)
let namespaceIsGlobal = not moduleKind.IsModule && s = ""
let sep =
if namespaceIsGlobal
then sepNln +> sepNlnConsideringTriviaContentBefore node.Range
else sepModuleAndFirstDecl
let expr =
genPreXmlDoc px
+> genAttributes astContext ats
+> ifElse (moduleKind = AnonModule)
sepNone
(genTriviaForLongIdent (moduleOrNamespace +> opt sepSpace ao genAccess +> recursive +> namespaceFn +> sep))
if namespaceIsGlobal then
expr +> genTrivia node.Range (genModuleDeclList astContext mds)
else
expr +> genModuleDeclList astContext mds
|> genTrivia node.Range
and genSigModuleOrNamespace astContext (SigModuleOrNamespace(ats, px, ao, s, mds, _, moduleKind) as node) =
let range = match node with | SynModuleOrNamespaceSig(_,_,_,_,_,_,_,range) -> range
let sepModuleAndFirstDecl =
let firstDecl = List.tryHead mds
match firstDecl with
| None -> rep 2 sepNln
| Some mdl ->
sepNlnConsideringTriviaContentBefore mdl.Range +> sepNln
let genTriviaForLongIdent (f: Context -> Context) =
match node with
| SynModuleOrNamespaceSig(lid,_, SynModuleOrNamespaceKind.DeclaredNamespace,_,_,_,_,_) ->
lid
|> List.fold (fun (acc: Context -> Context) (ident:Ident) -> acc |> (genTrivia ident.idRange)) f
| _ -> f
let moduleOrNamespace = ifElse moduleKind.IsModule (!- "module ") (!- "namespace ")
// Don't generate trivia before in case the SynModuleOrNamespaceKind is a DeclaredNamespace
// The range of the namespace is not correct, see https://github.com/dotnet/fsharp/issues/7680
ifElse moduleKind.IsModule (enterNode range) sepNone +>
genPreXmlDoc px
+> genAttributes astContext ats
+> ifElse (moduleKind = AnonModule)
sepNone
(genTriviaForLongIdent (moduleOrNamespace +> opt sepSpace ao genAccess -- s +> sepModuleAndFirstDecl))
+> genSigModuleDeclList astContext mds
+> leaveNode range
and genModuleDeclList astContext e =
match e with
| OpenL(xs, ys) ->
match ys with
| [] -> col sepNln xs (genModuleDecl astContext)
| _ ->
let sepModuleDecl =
match List.tryHead ys with
| Some ysh ->
let attrs = getRangesFromAttributesFromModuleDeclaration ysh
sepNln +> sepNlnConsideringTriviaContentBeforeWithAttributes ysh.Range attrs
| None -> rep 2 sepNln
(col sepNln xs (genModuleDecl astContext) +> sepModuleDecl +> genModuleDeclList astContext ys)
| m::rest ->
let attrs = getRangesFromAttributesFromModuleDeclaration m
let newlineAfterMultiline ctx =
let expr =
match List.tryHead rest with
| Some rm ->
let attrs = getRangesFromAttributesFromModuleDeclaration rm
sepNln +> sepNlnConsideringTriviaContentBeforeWithAttributes rm.Range attrs
| None -> sepNone
expr ctx
// Call trivia manually before genLetBinding
// Otherwise the expression might become multiline because of comments or defines above the let binding
enterNode m.Range
+> leadingExpressionIsMultiline
(expressionFitsOnRestOfLine
(genModuleDecl astContext m)
(sepNlnBeforeMultilineConstruct m.Range attrs +> genModuleDecl astContext m +> newlineAfterMultiline))
(fun multiline -> onlyIf (not multiline && List.isNotEmpty rest) sepNln)
+> genModuleDeclList astContext rest
| [] -> sepNone
and genSigModuleDeclList astContext node =
match node with
| [x] -> genSigModuleDecl astContext x
| SigOpenL(xs, ys) ->
let sepXsAndYs =
match List.tryHead ys with
| Some hs ->
let attrs = getRangesFromAttributesFromSynModuleSigDeclaration hs
sepNln +> sepNlnConsideringTriviaContentBeforeWithAttributes hs.Range attrs +> dumpAndContinue
| None ->
rep 2 sepNln
fun ctx ->
match ys with
| [] -> col sepNln xs (genSigModuleDecl astContext) ctx
| _ -> (col sepNln xs (genSigModuleDecl astContext) +> sepXsAndYs +> genSigModuleDeclList astContext ys) ctx
| SigHashDirectiveL(xs, ys) ->
match ys with
| [] -> col sepNone xs (genSigModuleDecl astContext)
| _ -> col sepNone xs (genSigModuleDecl astContext) +> sepNln +> genSigModuleDeclList astContext ys
| SigModuleAbbrevL(xs, ys)
| SigValL(xs, ys) ->
match ys with
| [] -> col sepNln xs (genSigModuleDecl astContext)
| _ ->
let sepXsYs =
match List.tryHead ys with
| Some ysh ->
let attributeRanges = getRangesFromAttributesFromSynModuleSigDeclaration ysh
sepNln +> sepNlnConsideringTriviaContentBeforeWithAttributes ysh.Range attributeRanges
| None -> rep 2 sepNln
col sepNln xs (genSigModuleDecl astContext) +> sepXsYs +> genSigModuleDeclList astContext ys
| SigMultilineModuleDeclL(xs, ys) ->
match ys with
| [] ->
colEx (fun (smd: SynModuleSigDecl) ->
let ranges = getRangesFromAttributesFromSynModuleSigDeclaration smd
sepNln +> sepNlnConsideringTriviaContentBeforeWithAttributes smd.Range ranges
) xs (genSigModuleDecl astContext)
| _ -> col (rep 2 sepNln) xs (genSigModuleDecl astContext) +> rep 2 sepNln +> genSigModuleDeclList astContext ys
| _ -> sepNone
// |> genTrivia node, see genModuleDeclList
and genModuleDecl astContext (node: SynModuleDecl) =
match node with
| Attributes(ats) ->
fun ctx ->
let attributesExpr =
// attributes can have trivia content before or after
// we do extra detection to ensure no additional newline is introduced
// first attribute should not have a newline anyway
List.fold (fun (prevContentAfterPresent, prevExpr) (a: SynAttributeList) ->
let expr =
ifElse prevContentAfterPresent sepNone (sepNlnConsideringTriviaContentBefore a.Range)
+> ((col sepNln a.Attributes (genAttribute astContext)) |> genTrivia a.Range)
let hasContentAfter =
TriviaHelpers.``has content after after that matches``
(fun tn -> tn.Range = a.Range)
(function | Directive(_) -> true | _ -> false)
ctx.Trivia
(hasContentAfter, prevExpr +> expr)
) (true, sepNone) ats
|> snd
(attributesExpr +> dumpAndContinue) ctx
| DoExpr(e) ->
genExpr astContext e
| Exception(ex) ->
genException astContext ex
| HashDirective(p) ->
genParsedHashDirective p
| Extern(ats, px, ao, t, s, ps) ->
genPreXmlDoc px
+> genAttributes astContext ats
-- "extern " +> genType { astContext with IsCStylePattern = true } false t +> sepSpace +> opt sepSpace ao genAccess
-- s +> sepOpenT +> col sepComma ps (genPat { astContext with IsCStylePattern = true }) +> sepCloseT
// Add a new line after module-level let bindings
| Let(b) ->
genLetBinding { astContext with IsFirstChild = true } "let " b
| LetRec(b::bs) ->
let sepBAndBs =
match List.tryHead bs with
| Some b' ->
let r = b'.RangeOfBindingSansRhs
sepNln +> sepNlnConsideringTriviaContentBefore r
| None -> id
genLetBinding { astContext with IsFirstChild = true } "let rec " b
+> sepBAndBs
+> colEx (fun (b': SynBinding) ->
let r = b'.RangeOfBindingSansRhs
sepNln +> sepNlnConsideringTriviaContentBefore r
) bs (genLetBinding { astContext with IsFirstChild = false } "and ")
| ModuleAbbrev(s1, s2) ->
!- "module " -- s1 +> sepEq +> sepSpace -- s2
| NamespaceFragment(m) ->
failwithf "NamespaceFragment hasn't been implemented yet: %O" m
| NestedModule(ats, px, ao, s, isRecursive, mds) ->
genPreXmlDoc px
+> genAttributes astContext ats
+> (!- "module ")
+> opt sepSpace ao genAccess
+> ifElse isRecursive (!- "rec ") sepNone -- s +> sepEq
+> indent +> sepNln
+> genModuleDeclList astContext mds +> unindent
| Open(s) ->
!- (sprintf "open %s" s)
// There is no nested types and they are recursive if there are more than one definition
| Types(t::ts) ->
let sepTs =
match List.tryHead ts with
| Some tsh -> sepNln +> sepNlnConsideringTriviaContentBefore tsh.Range
| None -> rep 2 sepNln
genTypeDefn { astContext with IsFirstChild = true } t
+> colPreEx sepTs (fun (ty: SynTypeDefn) -> sepNln +> sepNlnConsideringTriviaContentBefore ty.Range) ts (genTypeDefn { astContext with IsFirstChild = false })
| md ->
failwithf "Unexpected module declaration: %O" md
|> genTrivia node.Range
and genSigModuleDecl astContext node =
match node with
| SigException(ex) ->
genSigException astContext ex
| SigHashDirective(p) ->
genParsedHashDirective p
| SigVal(v) ->
genVal astContext v
| SigModuleAbbrev(s1, s2) ->
!- "module " -- s1 +> sepEq +> sepSpace -- s2
| SigNamespaceFragment(m) ->
failwithf "NamespaceFragment is not supported yet: %O" m
| SigNestedModule(ats, px, ao, s, mds) ->
genPreXmlDoc px
+> genAttributes astContext ats -- "module " +> opt sepSpace ao genAccess -- s +> sepEq
+> indent +> sepNln +> genSigModuleDeclList astContext mds +> unindent
| SigOpen(s) ->
!- (sprintf "open %s" s)
| SigTypes(t::ts) ->
genSigTypeDefn { astContext with IsFirstChild = true } t
+> colPre (rep 2 sepNln) (rep 2 sepNln) ts (genSigTypeDefn { astContext with IsFirstChild = false })
| md ->
failwithf "Unexpected module signature declaration: %O" md
|> genTrivia node.Range
and genAccess (Access s) = !- s
and genAttribute astContext (Attribute(s, e, target)) =
match e with
// Special treatment for function application on attributes
| ConstExpr(Const "()", _) ->
!- "[<" +> opt sepColonFixed target (!-) -- s -- ">]"
| e ->
let argSpacing =
if SourceTransformer.hasParenthesis e then id else sepSpace
!- "[<" +> opt sepColonFixed target (!-) -- s +> argSpacing +> genExpr astContext e -- ">]"
|> genTrivia e.Range
and genAttributesCore astContext (ats: SynAttribute seq) =
let genAttributeExpr astContext (Attribute(s, e, target) as attr) =
match e with
| ConstExpr(Const "()", _) ->
opt sepColonFixed target (!-) -- s
| e ->
let argSpacing =
if SourceTransformer.hasParenthesis e then id else sepSpace
opt sepColonFixed target (!-) -- s +> argSpacing +> genExpr astContext e
|> genTrivia attr.Range
ifElse (Seq.isEmpty ats) sepNone (!- "[<" +> col sepSemi ats (genAttributeExpr astContext) -- ">]")
and genOnelinerAttributes astContext ats =
let ats = List.collect (fun a -> a.Attributes) ats
ifElse (Seq.isEmpty ats) sepNone (genAttributesCore astContext ats +> sepSpace)
/// Try to group attributes if they are on the same line
/// Separate same-line attributes by ';'
/// Each bucket is printed in a different line
and genAttributes astContext (ats: SynAttributes) =
ats
|> List.fold (fun acc a ->
fun (ctx:Context) ->
let dontAddNewline =
TriviaHelpers.``has content after that ends with``
(fun t -> t.Range = a.Range)
(function | Directive(_) | Newline -> true | _ -> false)
ctx.Trivia
let chain =
acc +>
(genAttributesCore astContext a.Attributes |> genTrivia a.Range)
+> ifElse dontAddNewline sepNone sepNln
chain ctx
) sepNone
and genPreXmlDoc (PreXmlDoc lines) ctx =
if ctx.Config.StrictMode then
colPost sepNln sepNln lines (sprintf "///%s" >> (!-)) ctx
else ctx
and addSpaceAfterGenericConstructBeforeColon ctx =
if not ctx.Config.SpaceBeforeColon then
match Context.lastWriteEventOnLastLine ctx |> Option.bind Seq.tryLast with
| Some('>') -> sepSpace
| _ -> sepNone
else
sepNone
<| ctx
and genExprSepEqPrependType astContext (pat:SynPat) (e: SynExpr) (isPrefixMultiline: bool) ctx =
let hasTriviaContentAfterEqual =
ctx.Trivia
|> List.exists (fun tn ->
match tn.Type with
| TriviaTypes.Token(tok) ->
tok.TokenInfo.TokenName = "EQUALS" && tn.Range.StartLine = pat.Range.StartLine
| _ -> false
)
let sepEqual predicate = ifElse predicate (indent +> sepNln +> !- "=" +> unindent) (sepEq +> sepSpace)
match e with
| TypedExpr(Typed, e, t) ->
let addExtraSpaceBeforeGenericType =
match pat with
| SynPat.LongIdent(_, _, Some(SynValTyparDecls(_)), _, _, _) ->
addSpaceAfterGenericConstructBeforeColon
| _ -> sepNone
let hasLineCommentBeforeColon = TriviaHelpers.``has line comment before`` t.Range ctx.Trivia
let genCommentBeforeColon ctx =
(ifElse hasLineCommentBeforeColon indent sepNone
+> enterNode t.Range
+> ifElse hasLineCommentBeforeColon unindent sepNone) ctx
(addExtraSpaceBeforeGenericType
+> genCommentBeforeColon
+> sepColon
+> genType astContext false t
+> sepEqual (isPrefixMultiline || hasLineCommentBeforeColon)
+> ifElse (isPrefixMultiline || hasTriviaContentAfterEqual || hasLineCommentBeforeColon)
(indent +> sepNln +> genExpr astContext e +> unindent)
(isShortExpressionOrAddIndentAndNewline ctx.Config.MaxLetBindingWidth (genExpr astContext e))) ctx
| e ->
let genE =
match e with
| MultilineString(_)
| _ when (TriviaHelpers.``has content itself that is multiline string`` e.Range ctx.Trivia) ->
genExpr astContext e
| _ -> isShortExpressionOrAddIndentAndNewline ctx.Config.MaxLetBindingWidth (genExpr astContext e)
(sepEqual isPrefixMultiline
+> leaveEqualsToken pat.Range
+> ifElse (isPrefixMultiline || hasTriviaContentAfterEqual)
(indent +> sepNln +> genExpr astContext e +> unindent)
genE) ctx
and genTyparList astContext tps =
ifElse (List.atMostOne tps) (col wordOr tps (genTypar astContext)) (sepOpenT +> col wordOr tps (genTypar astContext) +> sepCloseT)
and genTypeAndParam astContext typeName tds tcs preferPostfix =
let types openSep closeSep =
(!- openSep +> coli sepComma tds (fun i decl -> genTyparDecl { astContext with IsFirstTypeParam = i = 0 } decl)
+> colPre (!- " when ") wordAnd tcs (genTypeConstraint astContext) -- closeSep)
if List.isEmpty tds then !- typeName
elif preferPostfix then !- typeName +> types "<" ">"
elif List.atMostOne tds then types "" "" -- " " -- typeName
else types "(" ")" -- " " -- typeName
and genTypeParamPostfix astContext tds tcs = genTypeAndParam astContext "" tds tcs true
and genLetBinding astContext pref b =
match b with
| LetBinding(ats, px, ao, isInline, isMutable, p, e) ->
let genPat =
match e, p with
| TypedExpr(Typed, _, t), PatLongIdent(ao, s, ps, tpso) when (List.length ps > 1)->
genPatWithReturnType ao s ps tpso (Some t) astContext
| _, PatLongIdent(ao, s, ps, tpso) when (List.length ps > 1)->
genPatWithReturnType ao s ps tpso None astContext
| _ ->
genPat astContext p
let genAttr =
ifElse astContext.IsFirstChild
(genAttributes astContext ats -- pref)
(!- pref +> genOnelinerAttributes astContext ats)
let afterLetKeyword =
opt sepSpace ao genAccess
+> ifElse isMutable (!- "mutable ") sepNone
+> ifElse isInline (!- "inline ") sepNone
genPreXmlDoc px
+> genAttr // this already contains the `let` or `and` keyword
+> leadingExpressionIsMultiline (afterLetKeyword +> genPat) (genExprSepEqPrependType astContext p e)
| DoBinding(ats, px, e) ->
let prefix = if pref.Contains("let") then pref.Replace("let", "do") else "do "
genPreXmlDoc px
+> genAttributes astContext ats -- prefix
+> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| b ->
failwithf "%O isn't a let binding" b
|> genTrivia b.RangeOfBindingSansRhs
and genShortGetProperty astContext (pat:SynPat) e =
genExprSepEqPrependType astContext pat e false
and genProperty astContext prefix ao propertyKind ps e =
let tuplerize ps =
let rec loop acc = function
| [p] -> (List.rev acc, p)
| p1::ps -> loop (p1::acc) ps
| [] -> invalidArg "p" "Patterns should not be empty"
loop [] ps
match ps with
| [PatTuple ps] ->
let (ps, p) = tuplerize ps
!- prefix +> opt sepSpace ao genAccess -- propertyKind
+> ifElse (List.atMostOne ps) (col sepComma ps (genPat astContext) +> sepSpace)
(sepOpenT +> col sepComma ps (genPat astContext) +> sepCloseT +> sepSpace)
+> genPat astContext p +> genExprSepEqPrependType astContext p e false
| ps ->
let (_,p) = tuplerize ps
!- prefix +> opt sepSpace ao genAccess -- propertyKind +> col sepSpace ps (genPat astContext)
+> genExprSepEqPrependType astContext p e false
|> genTrivia e.Range
and genPropertyWithGetSet astContext (b1, b2) =
match b1, b2 with
| PropertyBinding(ats, px, ao, isInline, mf1, PatLongIdent(ao1, s1, ps1, _), e1),
PropertyBinding(_, _, _, _, _, PatLongIdent(ao2, _, ps2, _), e2) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats +> genMemberFlags astContext mf1
+> ifElse isInline (!- "inline ") sepNone +> opt sepSpace ao genAccess
assert(ps1 |> Seq.map fst |> Seq.forall Option.isNone)
assert(ps2 |> Seq.map fst |> Seq.forall Option.isNone)
let ps1 = List.map snd ps1
let ps2 = List.map snd ps2
prefix
+> genTrivia b1.RangeOfBindingAndRhs
(!- s1 +> indent +> sepNln
+> genProperty astContext "with " ao1 "get " ps1 e1 +> sepNln)
+> genTrivia b2.RangeOfBindingAndRhs
(genProperty astContext "and " ao2 "set " ps2 e2 +> unindent)
| _ -> sepNone
/// Each member is separated by a new line.
and genMemberBindingList astContext node =
let newlineAfterMultiline rest ctx =
let expr =
match List.tryHead rest with
| Some rm ->
let attrs = getRangesFromAttributesFromSynBinding rm
sepNln +> sepNlnConsideringTriviaContentBeforeWithAttributes rm.RangeOfBindingSansRhs attrs
| None -> sepNone
expr ctx
match node with
| PropertyWithGetSet(gs, rest) ->
leadingExpressionIsMultiline
(expressionFitsOnRestOfLine
(genPropertyWithGetSet astContext gs)
(sepNln +> genPropertyWithGetSet astContext gs +> newlineAfterMultiline rest))
(fun multiline -> onlyIf (not multiline && List.isNotEmpty rest) sepNln)
+> genMemberBindingList astContext rest
| mb::rest ->
leadingExpressionIsMultiline
(expressionFitsOnRestOfLine
(genMemberBinding astContext mb)
(genMemberBinding astContext mb +> newlineAfterMultiline rest))
(fun multiline -> onlyIf (not multiline && List.isNotEmpty rest) sepNln)
+> genMemberBindingList astContext rest
| _ -> sepNone
and genMemberBinding astContext b =
match b with
| PropertyBinding(ats, px, ao, isInline, mf, p, e) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats +> genMemberFlags astContext mf
+> ifElse isInline (!- "inline ") sepNone +> opt sepSpace ao genAccess
let propertyKind =
match mf with
| MFProperty PropertyGet -> "get "
| MFProperty PropertySet -> "set "
| mf -> failwithf "Unexpected member flags: %O" mf
match p with
| PatLongIdent(ao, s, ps, _) ->
assert (ps |> Seq.map fst |> Seq.forall Option.isNone)
match ao, propertyKind, ps with
| None, "get ", [_, PatParen(PatConst(Const "()", _))] ->
// Provide short-hand notation `x.Member = ...` for `x.Member with get()` getters
prefix -- s +> genShortGetProperty astContext p e
| _ ->
let ps = List.map snd ps
prefix -- s +> indent +> sepNln +>
genProperty astContext "with " ao propertyKind ps e
+> unindent
| p -> failwithf "Unexpected pattern: %O" p
| MemberBinding(ats, px, ao, isInline, mf, p, e) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats +> genMemberFlagsForMemberBinding astContext mf b.RangeOfBindingAndRhs
+> ifElse isInline (!- "inline ") sepNone +> opt sepSpace ao genAccess +> genPat ({ astContext with IsMemberDefinition = true }) p
match e with
| TypedExpr(Typed, e, t) -> prefix +> sepColon +> genType astContext false t +> sepEq +> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| e -> prefix +> sepEq +> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| ExplicitCtor(ats, px, ao, p, e, so) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats
+> opt sepSpace ao genAccess +> genPat astContext p
+> opt sepNone so (sprintf " as %s" >> (!-))
match e with
// Handle special "then" block i.e. fake sequential expressions in constructors
| Sequential(e1, e2, false) ->
prefix +> sepEq +> indent +> sepNln
+> genExpr astContext e1 ++ "then "
+> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e2)
+> unindent
| e -> prefix +> sepEq +> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| b -> failwithf "%O isn't a member binding" b
|> genTrivia b.RangeOfBindingSansRhs
and genMemberFlags astContext node =
match node with
| MFMember _ -> !- "member "
| MFStaticMember _ -> !- "static member "
| MFConstructor _ -> sepNone
| MFOverride _ -> ifElse astContext.InterfaceRange.IsSome (!- "member ") (!- "override ")
// |> genTrivia node check each case
and genMemberFlagsForMemberBinding astContext (mf:MemberFlags) (rangeOfBindingAndRhs: range) =
fun ctx ->
match mf with
| MFMember _
| MFStaticMember _
| MFConstructor _ ->
genMemberFlags astContext mf
| MFOverride _ ->
(fun (ctx: Context) ->
ctx.Trivia
|> List.tryFind(fun { Type = t; Range = r } ->
match t with
| MainNode "SynMemberDefn.Member" -> // trying to get AST trivia
RangeHelpers.``range contains`` r rangeOfBindingAndRhs
| Token { TokenInfo = { TokenName = "MEMBER" } } -> // trying to get token trivia
r.StartLine = rangeOfBindingAndRhs.StartLine
| _ -> false
)
|> Option.bind(fun tn ->
tn.ContentItself
|> Option.bind (fun tc ->
match tc with
| Keyword({ Content = ("override" | "default" | "member") as kw }) -> Some (!- (kw + " "))
| _ -> None
)
)
|> Option.defaultValue (!- "override ")
<| ctx
)
<| ctx
and genVal astContext (Val(ats, px, ao, s, t, vi, isInline, _) as node) =
let range, synValTyparDecls =
match node with
| ValSpfn(_,_, synValTyparDecls,_,_,_,_,_,_,_,range) -> range, synValTyparDecls
let genericParams =
match synValTyparDecls with
| SynValTyparDecls([], _, _) -> sepNone
| SynValTyparDecls(tpd, _, cst) -> genTypeParamPostfix astContext tpd cst
let (FunType namedArgs) = (t, vi)
genPreXmlDoc px
+> genAttributes astContext ats
+> atCurrentColumn (indent -- "val "
+> onlyIf isInline (!- "inline ")
+> opt sepSpace ao genAccess -- s
+> genericParams
+> addSpaceAfterGenericConstructBeforeColon
+> sepColon
+> ifElse (List.isNotEmpty namedArgs) (genTypeList astContext namedArgs) (genConstraints astContext t)
+> unindent)
|> genTrivia range
and genRecordFieldName astContext (RecordFieldName(s, eo) as node) =
let (rfn,_,_) = node
let range = (fst rfn).Range
opt sepNone eo (fun e ->
let expr =
match e with
| MultilineString _ -> sepSpace +> genExpr astContext e
| _ -> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
!- s +> sepEq +> expr)
|> genTrivia range
and genAnonRecordFieldName astContext (AnonRecordFieldName(s, e)) =
let expr =
match e with
| MultilineString _ -> sepSpace +> genExpr astContext e
| _ -> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
!- s +> sepEq +> expr
and genTuple astContext es =
let f = addParenForTupleWhen (genExpr astContext)
let shortExpression = col sepComma es f
let longExpression = col (sepComma +> sepNln) es f
atCurrentColumn (expressionFitsOnRestOfLine shortExpression longExpression)
and genExpr astContext synExpr =
let appNlnFun e =
match e with
| MultilineString _
| Lambda _
| Paren (Lambda _)
| Paren (MatchLambda _) -> id
| _ -> autoNlnIfExpressionExceedsPageWidth
let kw tokenName f = tokN synExpr.Range tokenName f
let sepOpenT = tokN synExpr.Range "LPAREN" sepOpenT
let sepCloseT = tokN synExpr.Range "RPAREN" sepCloseT
match synExpr with
| SingleExpr(Lazy, e) ->
// Always add braces when dealing with lazy
let hasParenthesis = hasParenthesis e
let isInfixExpr =
match e with
| InfixApps _ -> true
| _ -> false
let genInfixExpr (ctx: Context) =
isShortExpression
ctx.Config.MaxInfixOperatorExpression
// if this fits on the rest of line right after the lazy keyword, it should be wrapped in parenthesis.
(sepOpenT +> genExpr astContext e +> sepCloseT)
// if it is multiline there is no need for parenthesis, because of the indentation
(indent +> sepNln +> genExpr astContext e +> unindent)
ctx
let genNonInfixExpr =
autoIndentAndNlnIfExpressionExceedsPageWidth
(onlyIfNot hasParenthesis sepOpenT
+> genExpr astContext e
+> onlyIfNot hasParenthesis sepCloseT)
str "lazy "
+> ifElse isInfixExpr genInfixExpr genNonInfixExpr
| SingleExpr(kind, e) -> str kind +> genExpr astContext e
| ConstExpr(c,r) -> genConst c r
| NullExpr -> !- "null"
// Not sure about the role of e1
| Quote(_, e2, isRaw) ->
let e = genExpr astContext e2
ifElse isRaw (!- "<@@ " +> e -- " @@>") (!- "<@ " +> e -- " @>")
| TypedExpr(TypeTest, e, t) -> genExpr astContext e -- " :? " +> genType astContext false t
| TypedExpr(New, e, t) ->
!- "new " +> genType astContext false t +> ifElse (hasParenthesis e) sepNone sepSpace +> genExpr astContext e
| TypedExpr(Downcast, e, t) -> genExpr astContext e -- " :?> " +> genType astContext false t
| TypedExpr(Upcast, e, t) -> genExpr astContext e -- " :> " +> genType astContext false t
| TypedExpr(Typed, e, t) -> genExpr astContext e +> sepColon +> genType astContext false t
| Tuple es -> genTuple astContext es
| StructTuple es -> !- "struct " +> sepOpenT +> genTuple astContext es +> sepCloseT
| ArrayOrList(isArray, [], _) ->
ifElse isArray (sepOpenAFixed +> sepCloseAFixed) (sepOpenLFixed +> sepCloseLFixed)
| ArrayOrList(isArray, xs, _) as alNode ->
let shortExpression =
ifElse isArray sepOpenA sepOpenL
+> col sepSemi xs (genExpr astContext)
+> ifElse isArray sepCloseA sepCloseL
let multilineExpression =
ifAlignBrackets
(genMultiLineArrayOrListAlignBrackets isArray xs alNode astContext)
(genMultiLineArrayOrList isArray xs alNode astContext)
fun ctx ->
// If an array or list has any form of line comments inside them, they cannot fit on a single line
// check for any comments inside the range of the node
if (TriviaHelpers.``has line comments inside`` alNode.Range ctx.Trivia) then
multilineExpression ctx
else
isShortExpression ctx.Config.MaxArrayOrListWidth shortExpression multilineExpression ctx
| Record(inheritOpt, xs, eo) ->
let shortRecordExpr =
sepOpenS +>
leaveLeftBrace synExpr.Range +>
optSingle
(fun (inheritType, inheritExpr) -> !- "inherit " +> genType astContext false inheritType +> genExpr astContext inheritExpr +> onlyIf (List.isNotEmpty xs) sepSemi)
inheritOpt +>
optSingle (fun e -> genExpr astContext e +> !- " with ") eo +>
col sepSemi xs (genRecordFieldName astContext) +>
sepCloseS
let multilineRecordExpr =
ifAlignBrackets
(genMultilineRecordInstanceAlignBrackets inheritOpt xs eo astContext)
(genMultilineRecordInstance inheritOpt xs eo synExpr astContext)
fun ctx ->
isShortExpression
ctx.Config.MaxRecordWidth
shortRecordExpr
multilineRecordExpr
ctx
| AnonRecord(isStruct, fields, copyInfo) ->
let shortExpression =
onlyIf isStruct !- "struct "
+> sepOpenAnonRecd
+> optSingle (fun e -> genExpr astContext e +> !- " with ") copyInfo
+> col sepSemi fields (genAnonRecordFieldName astContext)
+> sepCloseAnonRecd
let longExpression =
ifAlignBrackets
(genMultilineAnonRecordAlignBrackets isStruct fields copyInfo astContext)
(genMultilineAnonRecord isStruct fields copyInfo astContext)
fun (ctx: Context) ->
isShortExpression
ctx.Config.MaxRecordWidth
shortExpression
longExpression
ctx
| ObjExpr(t, eio, bd, ims, range) ->
ifAlignBrackets
(genObjExprAlignBrackets t eio bd ims range astContext)
(genObjExpr t eio bd ims range astContext)
| While(e1, e2) ->
atCurrentColumn (!- "while " +> genExpr astContext e1 -- " do"
+> indent +> sepNln +> genExpr astContext e2 +> unindent)
| For(s, e1, e2, e3, isUp) ->
atCurrentColumn (!- (sprintf "for %s = " s) +> genExpr astContext e1
+> ifElse isUp (!- " to ") (!- " downto ") +> genExpr astContext e2 -- " do"
+> indent +> sepNln +> genExpr astContext e3 +> unindent)
// Handle the form 'for i in e1 -> e2'
| ForEach(p, e1, e2, isArrow) ->
atCurrentColumn (
!- "for " +> genPat astContext p -- " in " +> genExpr { astContext with IsNakedRange = true } e1
+> ifElse isArrow
(sepArrow +> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e2))
(!- " do" +> indent +> sepNln +> genExpr astContext e2 +> unindent))
| CompExpr(isArrayOrList, e) ->
ifElse isArrayOrList
(genExpr astContext e)
// The opening { of the CompExpr is being added at the App(_,_,Ident(_),CompExr(_)) level
(expressionFitsOnRestOfLine
(genExpr astContext e +> sepCloseS)
(genExpr astContext e +> unindent +> sepNln +> sepCloseSFixed))
| ArrayOrListOfSeqExpr(isArray, e) as aNode ->
let astContext = { astContext with IsNakedRange = true }
let shortExpression =
ifElse isArray
(sepOpenA +> genExpr astContext e +> enterRightBracketBar aNode.Range +> sepCloseA)
(sepOpenL +> genExpr astContext e +> enterRightBracket aNode.Range +> sepCloseL)
let bracketsOnSameColumn =
ifElse isArray sepOpenAFixed sepOpenLFixed
+> indent +> sepNln
+> genExpr astContext e
+> unindent +> sepNln
+> ifElse isArray sepCloseAFixed sepCloseLFixed
let multilineExpression =
ifAlignBrackets bracketsOnSameColumn shortExpression
fun ctx -> isShortExpression ctx.Config.MaxArrayOrListWidth shortExpression multilineExpression ctx
| JoinIn(e1, e2) -> genExpr astContext e1 -- " in " +> genExpr astContext e2
| Paren(DesugaredLambda(cps, e)) ->
fun (ctx: Context) ->
let lastLineOnlyContainsParenthesis = lastLineOnlyContains [| ' ';'('|] ctx
let hasLineCommentAfterArrow =
findTriviaTokenFromName synExpr.Range ctx.Trivia "RARROW"
|> Option.isSome
let expr =
sepOpenT
-- "fun "
+> col sepSpace cps (genComplexPats astContext)
+> triviaAfterArrow synExpr.Range
+> ifElse hasLineCommentAfterArrow (genExpr astContext e)
(ifElse lastLineOnlyContainsParenthesis (autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e))
(autoNlnIfExpressionExceedsPageWidth (genExpr astContext e)))
+> sepCloseT
expr ctx
| DesugaredLambda(cps, e) ->
!- "fun " +> col sepSpace cps (genComplexPats astContext) +> sepArrow
+> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| Paren(Lambda(e, sps)) ->
fun (ctx: Context) ->
let lastLineOnlyContainsParenthesis = lastLineOnlyContains [| ' ';'('|] ctx
let hasLineCommentAfterArrow =
findTriviaTokenFromName synExpr.Range ctx.Trivia "RARROW"
|> Option.isSome
let expr =
sepOpenT
-- "fun "
+> col sepSpace sps (genSimplePats astContext)
+> triviaAfterArrow synExpr.Range
+> ifElse hasLineCommentAfterArrow (genExpr astContext e)
(ifElse lastLineOnlyContainsParenthesis (autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e))
(autoNlnIfExpressionExceedsPageWidth (genExpr astContext e)))
+> sepCloseT
expr ctx
// When there are parentheses, most likely lambda will appear in function application
| Lambda(e, sps) ->
!- "fun " +> col sepSpace sps (genSimplePats astContext) +> sepArrow
+> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| MatchLambda(sp, _) -> !- "function " +> colPre sepNln sepNln sp (genClause astContext true)
| Match(e, cs) ->
atCurrentColumn (!- "match " +> genExpr astContext e -- " with" +> colPre sepNln sepNln cs (genClause astContext true))
| MatchBang(e, cs) ->
atCurrentColumn (!- "match! " +> genExpr astContext e -- " with" +> colPre sepNln sepNln cs (genClause astContext true))
| TraitCall(tps, msg, e) ->
genTyparList astContext tps +> sepColon +> sepOpenT +> genMemberSig astContext msg +> sepCloseT
+> sepSpace +> genExpr astContext e
| Paren (ILEmbedded r) ->
// Just write out original code inside (# ... #)
fun ctx -> !- (defaultArg (lookup r ctx) "") ctx
| Paren e ->
// Parentheses nullify effects of no space inside DotGet
sepOpenT +> genExpr { astContext with IsInsideDotGet = false } e +> sepCloseT
| CompApp(s, e) ->
!- s +> sepSpace +> sepOpenS +> genExpr { astContext with IsNakedRange = true } e +> sepCloseS
// This supposes to be an infix function, but for some reason it isn't picked up by InfixApps
| App(Var "?", e::es) ->
match es with
| SynExpr.Const(SynConst.String(_,_),_)::_ ->