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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.Text
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
open Fantomas.AstExtensions
/// This type consists of contextual information which is important for formatting
/// Please avoid using this record as it can be the cause of unexpected behavior when used incorrectly
type ASTContext =
{ /// 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
/// 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
/// Inside a SynPat of MatchClause
IsInsideMatchClausePattern: bool }
static member Default =
{ IsFirstChild = false
InterfaceRange = None
IsCStylePattern = false
IsNakedRange = false
IsUnionField = false
IsFirstTypeParam = false
IsInsideMatchClausePattern = false }
let rec addSpaceBeforeParensInFunCall functionOrMethod arg (ctx: Context) =
match functionOrMethod, arg with
| SynExpr.TypeApp (e, _, _, _, _, _, _), _ -> addSpaceBeforeParensInFunCall e arg ctx
| SynExpr.Paren _, _ -> true
| SynExpr.Const _, _ -> true
| UppercaseSynExpr, ConstUnitExpr -> ctx.Config.SpaceBeforeUppercaseInvocation
| LowercaseSynExpr, ConstUnitExpr -> ctx.Config.SpaceBeforeLowercaseInvocation
| SynExpr.Ident _, SynExpr.Ident _ -> true
| UppercaseSynExpr, Paren _ -> ctx.Config.SpaceBeforeUppercaseInvocation
| LowercaseSynExpr, Paren _ -> ctx.Config.SpaceBeforeLowercaseInvocation
| _ -> true
let addSpaceBeforeParensInFunDef (spaceBeforeSetting: bool) (functionOrMethod: string) args =
let isLastPartUppercase =
let parts = functionOrMethod.Split '.'
Char.IsUpper parts.[parts.Length - 1].[0]
match functionOrMethod, args with
| "new", _ -> false
| _, PatParen _ -> spaceBeforeSetting
| _, PatNamed _
| _, SynPat.Wild _ -> true
| _: string, _ -> not isLastPartUppercase
| _ -> true
let rec genParsedInput astContext ast =
match ast with
| ImplFile im -> genImpFile astContext im
| SigFile si -> genSigFile astContext si
+> ifElseCtx lastWriteEventIsNewline sepNone sepNln
(*
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) =
Map.tryFind ParsedHashDirective_ ctx.TriviaMainNodes
|> Option.defaultValue []
|> List.tryFind (fun t -> RangeHelpers.rangeEq t.Range r)
|> Option.bind
(fun t ->
match t.ContentItself with
| Some (KeywordString c) -> Some c
| _ -> None)
|> function
| Some kw -> !-kw
| None -> col sepSpace s printArgument
<| ctx
!- "#" -- h +> sepSpace +> printIdent
|> genTriviaFor ParsedHashDirective_ r
and genModuleOrNamespaceKind (kind: SynModuleOrNamespaceKind) =
match kind with
| SynModuleOrNamespaceKind.DeclaredNamespace -> !- "namespace "
| SynModuleOrNamespaceKind.NamedModule -> !- "module "
| SynModuleOrNamespaceKind.GlobalNamespace -> !- "namespace global"
| SynModuleOrNamespaceKind.AnonModule -> sepNone
and genModuleOrNamespace astContext (ModuleOrNamespace (ats, px, ao, lids, mds, isRecursive, moduleKind)) =
let sepModuleAndFirstDecl =
let firstDecl = List.tryHead mds
match firstDecl with
| None -> sepNone
| Some mdl ->
let attrs =
getRangesFromAttributesFromModuleDeclaration mdl
sepNln
+> sepNlnConsideringTriviaContentBeforeWithAttributesFor (synModuleDeclToFsAstType mdl) mdl.Range attrs
let lidsFullRange =
match lids with
| [] -> range.Zero
| (_, r) :: _ -> Range.unionRanges r (List.last lids |> snd)
let moduleOrNamespace =
genModuleOrNamespaceKind moduleKind
+> opt sepSpace ao genAccess
+> ifElse isRecursive (!- "rec ") sepNone
+> col (!- ".") lids (fun (lid, r) -> genTriviaFor Ident_ r (!-lid))
|> genTriviaFor LongIdent_ lidsFullRange
// Anonymous module do have a single (fixed) ident in the LongIdent
// We don't print the ident but it could have trivia assigned to it.
let genTriviaForAnonModuleIdent =
match lids with
| [ (_, r) ] -> genTriviaFor Ident_ r sepNone
| _ -> sepNone
|> genTriviaFor LongIdent_ lidsFullRange
genPreXmlDoc px
+> genAttributes astContext ats
+> ifElse (moduleKind = AnonModule) genTriviaForAnonModuleIdent moduleOrNamespace
+> sepModuleAndFirstDecl
+> genModuleDeclList astContext mds
and genSigModuleOrNamespace astContext (SigModuleOrNamespace (ats, px, ao, lids, mds, isRecursive, moduleKind)) =
let sepModuleAndFirstDecl =
let firstDecl = List.tryHead mds
match firstDecl with
| None -> sepNone
| Some mdl ->
match mdl with
| SynModuleSigDecl.Types _ ->
let attrs =
getRangesFromAttributesFromSynModuleSigDeclaration mdl
sepNlnConsideringTriviaContentBeforeWithAttributesFor SynModuleSigDecl_Types mdl.Range attrs
| SynModuleSigDecl.Val _ -> sepNlnConsideringTriviaContentBeforeForMainNode ValSpfn_ mdl.Range
| _ -> sepNone
+> sepNln
let lidsFullRange =
match lids with
| [] -> range.Zero
| (_, r) :: _ -> Range.unionRanges r (List.last lids |> snd)
let moduleOrNamespace =
genModuleOrNamespaceKind moduleKind
+> opt sepSpace ao genAccess
+> ifElse isRecursive (!- "rec ") sepNone
+> col (!- ".") lids (fun (lid, r) -> genTriviaFor Ident_ r (!-lid))
|> genTriviaFor LongIdent_ lidsFullRange
genPreXmlDoc px
+> genAttributes astContext ats
+> ifElse (moduleKind = AnonModule) sepNone moduleOrNamespace
+> sepModuleAndFirstDecl
+> genSigModuleDeclList astContext mds
and genModuleDeclList astContext e =
let rec collectItems
(e: SynModuleDecl list)
(finalContinuation: ColMultilineItem list -> ColMultilineItem list)
: ColMultilineItem list =
match e with
| [] -> finalContinuation []
| OpenL (xs, ys) ->
let expr = col sepNln xs (genModuleDecl astContext)
let r = List.head xs |> fun mdl -> mdl.Range
// SynModuleDecl.Open cannot have attributes
let sepNln =
sepNlnConsideringTriviaContentBeforeForMainNode SynModuleDecl_Open r
collectItems
ys
(fun ysItems ->
ColMultilineItem(expr, sepNln) :: ysItems
|> finalContinuation)
| HashDirectiveL (xs, ys) ->
let expr = col sepNln xs (genModuleDecl astContext)
let r = List.head xs |> fun mdl -> mdl.Range
// SynModuleDecl.HashDirective cannot have attributes
let sepNln =
sepNlnConsideringTriviaContentBeforeForMainNode SynModuleDecl_HashDirective r
collectItems
ys
(fun ysItems ->
ColMultilineItem(expr, sepNln) :: ysItems
|> finalContinuation)
| AttributesL (xs, y :: rest) ->
let attrs =
getRangesFromAttributesFromModuleDeclaration y
let expr =
col sepNln xs (genModuleDecl astContext)
+> sepNlnConsideringTriviaContentBeforeWithAttributesFor (synModuleDeclToFsAstType y) y.Range attrs
+> genModuleDecl astContext y
let r = List.head xs |> fun mdl -> mdl.Range
let sepNln =
sepNlnConsideringTriviaContentBeforeForMainNode SynModuleDecl_Attributes r
collectItems
rest
(fun restItems ->
ColMultilineItem(expr, sepNln) :: restItems
|> finalContinuation)
| m :: rest ->
let attrs =
getRangesFromAttributesFromModuleDeclaration m
let sepNln =
sepNlnConsideringTriviaContentBeforeWithAttributesFor (synModuleDeclToFsAstType m) m.Range attrs
let expr = genModuleDecl astContext m
collectItems
rest
(fun restItems ->
ColMultilineItem(expr, sepNln) :: restItems
|> finalContinuation)
collectItems e id |> colWithNlnWhenItemIsMultiline
and genSigModuleDeclList astContext (e: SynModuleSigDecl list) =
let rec collectItems
(e: SynModuleSigDecl list)
(finalContinuation: ColMultilineItem list -> ColMultilineItem list)
: ColMultilineItem list =
match e with
| [] -> finalContinuation []
| SigOpenL (xs, ys) ->
let expr =
col sepNln xs (genSigModuleDecl astContext)
let r = List.head xs |> fun mdl -> mdl.Range
// SynModuleSigDecl.Open cannot have attributes
let sepNln =
sepNlnConsideringTriviaContentBeforeForMainNode SynModuleSigDecl_Open r
collectItems
ys
(fun ysItems ->
ColMultilineItem(expr, sepNln) :: ysItems
|> finalContinuation)
| s :: rest ->
let attrs =
getRangesFromAttributesFromSynModuleSigDeclaration s
let sepNln =
sepNlnConsideringTriviaContentBeforeWithAttributesFor (synModuleSigDeclToFsAstType s) s.Range attrs
let expr = genSigModuleDecl astContext s
collectItems
rest
(fun restItems ->
ColMultilineItem(expr, sepNln) :: restItems
|> finalContinuation)
collectItems e id |> colWithNlnWhenItemIsMultiline
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
(sepNlnConsideringTriviaContentBeforeForMainNode SynModuleDecl_Attributes a.Range)
+> ((col sepNln a.Attributes (genAttribute astContext))
|> genTriviaFor SynAttributeList_ a.Range)
let hasContentAfter =
TriviaHelpers.``has content after after that matches``
(fun tn -> RangeHelpers.rangeEq tn.Range a.Range)
(function
| Newline
| Comment (LineCommentOnSingleLine _)
| Directive _ -> true
| _ -> false)
(Map.tryFindOrEmptyList SynAttributeList_ ctx.TriviaMainNodes)
(hasContentAfter, prevExpr +> expr))
(true, sepNone)
ats
|> snd
attributesExpr ctx
| DoExpr e -> genExprKeepIndentInBranch 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'.RangeOfBindingAndRhs
sepNln
+> sepNlnConsideringTriviaContentBeforeForMainNode (synBindingToFsAstType b) r
| None -> id
genLetBinding { astContext with IsFirstChild = true } "let rec " b
+> sepBAndBs
+> colEx
(fun (b': SynBinding) ->
let r = b'.RangeOfBindingAndRhs
sepNln
+> sepNlnConsideringTriviaContentBeforeForMainNode (synBindingToFsAstType b) r)
bs
(fun andBinding ->
enterNodeFor (synBindingToFsAstType b) andBinding.RangeOfBindingAndRhs
+> genLetBinding { astContext with IsFirstChild = false } "and " andBinding)
| 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)
| OpenType s -> !-(sprintf "open type %s" s)
// There is no nested types and they are recursive if there are more than one definition
| Types (t :: ts) ->
let items =
ColMultilineItem(genTypeDefn { astContext with IsFirstChild = true } t, sepNone)
:: (List.map
(fun t ->
ColMultilineItem(
genTypeDefn { astContext with IsFirstChild = false } t,
sepNlnConsideringTriviaContentBeforeForMainNode TypeDefn_ t.Range
))
ts)
colWithNlnWhenItemIsMultilineUsingConfig items
| md -> failwithf "Unexpected module declaration: %O" md
|> genTriviaFor (synModuleDeclToFsAstType node) 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)
| SigOpenType s -> !-(sprintf "open type %s" s)
| SigTypes (t :: ts) ->
let items =
ColMultilineItem(genSigTypeDefn { astContext with IsFirstChild = true } t, sepNone)
:: (List.map
(fun t ->
let sepNln =
let attributeRanges =
getRangesFromAttributesFromSynTypeDefnSig t
sepNlnConsideringTriviaContentBeforeWithAttributesFor
TypeDefnSig_
t.FullRange
attributeRanges
ColMultilineItem(genSigTypeDefn { astContext with IsFirstChild = false } t, sepNln))
ts)
colWithNlnWhenItemIsMultilineUsingConfig items
| md -> failwithf "Unexpected module signature declaration: %O" md
|> (match node with
| SynModuleSigDecl.Types _ -> genTriviaFor SynModuleSigDecl_Types node.Range
| SynModuleSigDecl.NestedModule _ -> genTriviaFor SynModuleSigDecl_NestedModule node.Range
| SynModuleSigDecl.Open (SynOpenDeclTarget.ModuleOrNamespace _, _) ->
genTriviaFor SynModuleSigDecl_Open node.Range
| SynModuleSigDecl.Open (SynOpenDeclTarget.Type _, _) -> genTriviaFor SynModuleSigDecl_OpenType node.Range
| SynModuleSigDecl.Exception _ -> genTriviaFor SynModuleSigDecl_Exception node.Range
| _ -> id)
and genAccess (Access s) = !-s
and genAttribute astContext (Attribute (s, e, target)) =
match e with
// Special treatment for function application on attributes
| ConstUnitExpr -> !- "[<" +> opt sepColon target (!-) -- s -- ">]"
| e ->
let argSpacing =
if hasParenthesis e then
id
else
sepSpace
!- "[<" +> opt sepColon target (!-) -- s
+> argSpacing
+> genExpr astContext e
-- ">]"
and genAttributesCore astContext (ats: SynAttribute seq) =
let genAttributeExpr astContext (Attribute (s, e, target) as attr) =
match e with
| ConstUnitExpr -> opt sepColon target (!-) -- s
| e ->
let argSpacing =
if hasParenthesis e then
id
else
sepSpace
opt sepColon target (!-) -- s
+> argSpacing
+> genExpr astContext e
|> genTriviaFor SynAttribute_ attr.Range
let shortExpression =
!- "[<"
+> atCurrentColumn (col sepSemi ats (genAttributeExpr astContext))
-- ">]"
let longExpression =
!- "[<"
+> atCurrentColumn (col (sepSemi +> sepNln) ats (genAttributeExpr astContext))
-- ">]"
ifElse (Seq.isEmpty ats) sepNone (expressionFitsOnRestOfLine shortExpression longExpression)
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 (ctx: Context) ->
let dontAddNewline =
TriviaHelpers.``has content after that ends with``
(fun t -> RangeHelpers.rangeEq t.Range a.Range)
(function
| Directive _
| Newline
| Comment (LineCommentOnSingleLine _) -> true
| _ -> false)
(Map.tryFindOrEmptyList SynAttributeList_ ctx.TriviaMainNodes)
let chain =
acc
+> (genAttributesCore astContext a.Attributes
|> genTriviaFor SynAttributeList_ 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 genExprSepEqPrependType (astContext: ASTContext) (e: SynExpr) =
match e with
| TypedExpr (Typed, e, t) ->
sepColon
+> genType astContext false t
+> sepEq
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| _ ->
sepEq
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
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 ->
genTyparDecl
{ astContext with
IsFirstTypeParam = i = 0 })
+> colPre (!- " when ") wordAnd tcs (genTypeConstraint astContext)
-- closeSep)
if List.isEmpty tds then
!-typeName
elif preferPostfix then
!-typeName +> types "<" ">"
elif List.atMostOne tds then
genTyparDecl
{ astContext with
IsFirstTypeParam = true }
(List.head tds)
+> sepSpace
-- typeName
+> colPre (!- " when ") wordAnd tcs (genTypeConstraint astContext)
else
types "(" ")" -- " " -- typeName
and genTypeParamPostfix astContext tds tcs =
genTypeAndParam astContext "" tds tcs true
and genLetBinding astContext pref b =
let genPref = !-pref
match b with
| LetBinding (ats, px, ao, isInline, isMutable, p, e, valInfo) ->
match e, p with
| TypedExpr (Typed, e, t), PatLongIdent (ao, s, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunctionWithReturnType
astContext
false
px
ats
genPref
ao
isInline
isMutable
s
p.Range
ps
tpso
t
valInfo
e
| e, PatLongIdent (ao, s, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunction astContext false px ats genPref ao isInline isMutable s p.Range ps tpso e
| TypedExpr (Typed, e, t), pat ->
genSynBindingValue astContext px ats genPref ao isInline isMutable pat (Some t) e
| _, PatTuple _ -> genLetBindingDestructedTuple astContext px ats pref ao isInline isMutable p e
| _, pat -> genSynBindingValue astContext px ats genPref ao isInline isMutable pat None e
| _ -> sepNone
| 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
+> leaveNodeFor (synBindingToFsAstType b) b.RangeOfBindingAndRhs
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 e
| ps ->
!-prefix +> opt sepSpace ao genAccess
-- propertyKind
+> col sepSpace ps (genPat astContext)
+> genExprSepEqPrependType astContext e
and genPropertyWithGetSet astContext (b1, b2) rangeOfMember =
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
+> !-s1
+> indent
+> sepNln
+> optSingle (fun rom -> enterNodeTokenByName rom WITH) rangeOfMember
+> genProperty astContext "with " ao1 "get " ps1 e1
+> sepNln
+> genProperty astContext "and " ao2 "set " ps2 e2
+> unindent
| _ -> sepNone
and genMemberBindingList astContext node =
let rec collectItems
(node: SynBinding list)
(finalContinuation: ColMultilineItem list -> ColMultilineItem list)
: ColMultilineItem list =
match node with
| [] -> finalContinuation []
| mb :: rest ->
let expr = genMemberBinding astContext mb
let r = mb.RangeOfBindingAndRhs
let sepNln =
sepNlnConsideringTriviaContentBeforeForMainNode (synBindingToFsAstType mb) r
collectItems
rest
(fun restItems ->
ColMultilineItem(expr, sepNln) :: restItems
|> finalContinuation)
collectItems node id
|> colWithNlnWhenItemIsMultiline
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 PatUnitConst ] ->
// Provide short-hand notation `x.Member = ...` for `x.Member with get()` getters
prefix -- s
+> genExprSepEqPrependType astContext 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, synValInfo) ->
let prefix =
genMemberFlagsForMemberBinding astContext mf b.RangeOfBindingAndRhs
match e, p with
| TypedExpr (Typed, e, t), PatLongIdent (ao, s, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunctionWithReturnType
astContext
true
px
ats
prefix
ao
isInline
false
s
p.Range
ps
tpso
t
synValInfo
e
| e, PatLongIdent (ao, s, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunction astContext true px ats prefix ao isInline false s p.Range ps tpso e
| TypedExpr (Typed, e, t), pat -> genSynBindingValue astContext px ats prefix ao isInline false pat (Some t) e
| _, pat -> genSynBindingValue astContext px ats prefix ao isInline false pat None e
| ExplicitCtor (ats, px, ao, p, e, so) ->
let prefix =
let genPat ctx =
match p with
| PatExplicitCtor (ao, pat) ->
(opt sepSpace ao genAccess
+> !- "new"
+> sepSpaceBeforeClassConstructor
+> genPat astContext pat)
ctx
| _ -> genPat astContext p ctx
genPreXmlDoc px
+> genAttributes astContext ats
+> opt sepSpace ao genAccess
+> genPat
+> 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
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| b -> failwithf "%O isn't a member binding" b
|> genTriviaFor (synBindingToFsAstType b) b.RangeOfBindingAndRhs
and genMemberFlags astContext (mf: MemberFlags) =
match mf with
| MFMember _ -> !- "member "
| MFStaticMember _ -> !- "static member "
| MFConstructor _ -> sepNone
| MFOverride _ -> ifElse astContext.InterfaceRange.IsSome (!- "member ") (!- "override ")
and genMemberFlagsForMemberBinding astContext (mf: MemberFlags) (rangeOfBindingAndRhs: Range) =
fun ctx ->
let keywordFromTrivia =
[ yield! (Map.tryFindOrEmptyList SynMemberDefn_Member ctx.TriviaMainNodes)
yield! (Map.tryFindOrEmptyList SynMemberSig_Member ctx.TriviaMainNodes)
yield! (Map.tryFindOrEmptyList MEMBER ctx.TriviaTokenNodes) ]
|> List.tryFind
(fun { Type = t; Range = r } ->
match t with
| MainNode SynMemberDefn_Member
| MainNode SynMemberSig_Member -> // trying to get AST trivia
RangeHelpers.``range contains`` r rangeOfBindingAndRhs
| Token (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" | "abstract" | "abstract member" as kw } ->
Some(!-(kw + " "))
| _ -> None))
match mf with
| MFStaticMember _
| MFConstructor _ -> genMemberFlags astContext mf
| MFMember _ ->
keywordFromTrivia
|> Option.defaultValue (genMemberFlags astContext mf)
| MFOverride _ ->
keywordFromTrivia
|> Option.defaultValue (!- "override ")
<| ctx
and genVal astContext (Val (ats, px, ao, s, identRange, t, vi, isInline, isMutable, _, eo) as node) =
let range, synValTyparDecls =
match node with
| ValSpfn (_, _, synValTyparDecls, _, _, _, _, _, _, _, range) -> range, synValTyparDecls
let genericParams, hasGenerics =
match synValTyparDecls with
| SynValTyparDecls ([], _, _) -> sepNone, false
| SynValTyparDecls (tpd, _, cst) -> genTypeParamPostfix astContext tpd cst, true
let (FunType namedArgs) = (t, vi)
genPreXmlDoc px
+> genAttributes astContext ats
+> (!- "val "
+> onlyIf isInline (!- "inline ")
+> onlyIf isMutable (!- "mutable ")
+> opt sepSpace ao genAccess
-- s
+> genericParams
|> genTriviaFor Ident_ identRange)
+> ifElse hasGenerics sepColonWithSpacesFixed sepColon
+> ifElse
(List.isNotEmpty namedArgs)
(autoIndentAndNlnIfExpressionExceedsPageWidth (genTypeList astContext namedArgs))
(genConstraints astContext t vi)
+> optSingle (fun e -> sepEq +> sepSpace +> genExpr astContext e) eo
|> genTriviaFor ValSpfn_ range
and genRecordFieldName astContext (RecordFieldName (s, eo) as node) =
let rfn, _, _ = node
let range = (fst rfn).Range
opt
sepNone
eo
(fun e ->
let expr =
sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
!-s +> sepEq +> expr)
|> genTriviaFor RecordField_ range
and genAnonRecordFieldName astContext (AnonRecordFieldName (s, e)) =
let expr =
sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
!-s +> sepEq +> expr
and genTuple astContext es =
let genShortExpr astContext e =
addParenForTupleWhen (genExpr astContext) e
let shortExpression =
col sepComma es (genShortExpr astContext)
let longExpression =
let containsLambdaOrMatchExpr =
es
|> List.pairwise
|> List.exists
(function
| SynExpr.Match _, _
| SynExpr.Lambda _, _
| InfixApp (_, _, _, SynExpr.Lambda _), _ -> true
| _ -> false)
let sep =
if containsLambdaOrMatchExpr then
(sepNln +> sepComma)
else
(sepComma +> sepNln)
let lastIndex = List.length es - 1
let genExpr astContext idx e =
match e with
| SynExpr.IfThenElse _ when (idx < lastIndex) ->
autoParenthesisIfExpressionExceedsPageWidth (genExpr astContext e)
| _ -> genExpr astContext e
coli sep es (genExpr astContext)
atCurrentColumn (expressionFitsOnRestOfLine shortExpression longExpression)
and genNamedArgumentExpr (astContext: ASTContext) operatorExpr e1 e2 =
let short =
genExpr astContext e1
+> sepSpace
+> genInfixOperator "=" operatorExpr
+> sepSpace
+> genExpr astContext e2
let long =
genExpr astContext e1
+> sepSpace
+> genInfixOperator "=" operatorExpr
+> indent
+> sepNln
+> genExpr astContext e2
+> unindent
expressionFitsOnRestOfLine short long
and genExpr astContext synExpr ctx =
let kw tokenName f = tokN synExpr.Range tokenName f
let expr =
match synExpr with
| ElmishReactWithoutChildren (identifier, isArray, children, childrenRange) when
(not ctx.Config.DisableElmishSyntax)
->
fun (ctx: Context) ->
let tokenSize = if isArray then 2 else 1
let openingTokenRange, openTokenType =
ctx.MkRangeWith
(childrenRange.Start.Line, childrenRange.Start.Column)
(childrenRange.Start.Line, (childrenRange.Start.Column + tokenSize)),
(if isArray then LBRACK_BAR else LBRACK)
let closingTokenRange, closingTokenType =
ctx.MkRangeWith
(childrenRange.End.Line, (childrenRange.End.Column - tokenSize))
(childrenRange.End.Line, childrenRange.End.Column),
(if isArray then BAR_RBRACK else RBRACK)
let shortExpression =
let noChildren =
tokN openingTokenRange openTokenType (ifElse isArray sepOpenAFixed sepOpenLFixed)
+> tokN closingTokenRange closingTokenType (ifElse isArray sepCloseAFixed sepCloseLFixed)