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CodePrinter.fs
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CodePrinter.fs
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module internal Fantomas.Core.CodePrinter
open System
open System.Text.RegularExpressions
open FSharp.Compiler.Text
open FSharp.Compiler.Syntax
open FSharp.Compiler.SyntaxTrivia
open FSharp.Compiler.Xml
open Fantomas.Core.AstExtensions
open Fantomas.Core.FormatConfig
open Fantomas.Core.SourceParser
open Fantomas.Core.SourceTransformer
open Fantomas.Core.Context
open Fantomas.Core.TriviaTypes
/// 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 =
{
/// This pattern matters for formatting extern declarations
IsCStylePattern: 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
}
static member Default =
{ IsCStylePattern = false
IsUnionField = false
IsFirstTypeParam = 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: SynLongIdent) args =
match functionOrMethod, args with
| SynLongIdent(id = [ newIdent ]), _ when newIdent.idText = "new" -> false
| _, PatParen _ -> spaceBeforeSetting
| _, PatNamed _
| _, SynPat.Wild _ -> true
| SynLongIdent (id = lid), _ ->
match List.tryLast lid with
| None -> false
| Some ident -> not (Char.IsUpper ident.idText.[0])
| _ -> true
let rec genParsedInput astContext ast =
let genParsedInput =
match ast with
| ImplFile im -> genImpFile astContext im
| SigFile si -> genSigFile astContext si
genTriviaFor ParsedInput_ ast.FullRange genParsedInput +> addFinalNewline
/// Respect insert_final_newline setting
and addFinalNewline ctx =
let lastEvent = ctx.WriterEvents.TryHead
match lastEvent with
| Some WriteLineBecauseOfTrivia ->
if ctx.Config.InsertFinalNewline then
ctx
else
// Due to trivia the last event is a newline, if insert_final_newline is false, we need to remove it.
{ ctx with
WriterEvents = ctx.WriterEvents.Tail
WriterModel = { ctx.WriterModel with Lines = List.tail ctx.WriterModel.Lines } }
| _ -> onlyIf ctx.Config.InsertFinalNewline sepNln ctx
(*
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 sepNln 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, args, r)) =
let genArg (arg: ParsedHashDirectiveArgument) =
match arg with
| ParsedHashDirectiveArgument.String (value, stringKind, range) ->
genConstString stringKind value
|> genTriviaFor ParsedHashDirectiveArgument_String range
| ParsedHashDirectiveArgument.SourceIdentifier (identifier, _, range) ->
!-identifier |> genTriviaFor ParsedHashDirectiveArgument_String range
!- "#" +> !-h +> sepSpace +> col sepSpace args genArg
|> genTriviaFor ParsedHashDirective_ r
and genModuleOrNamespaceKind
(moduleRange: range option)
(namespaceRange: range option)
(kind: SynModuleOrNamespaceKind)
=
match kind with
| SynModuleOrNamespaceKind.DeclaredNamespace ->
genTriviaForOption SynModuleOrNamespace_Namespace namespaceRange !- "namespace "
| SynModuleOrNamespaceKind.NamedModule -> genTriviaForOption SynModuleOrNamespace_Module moduleRange !- "module "
| SynModuleOrNamespaceKind.GlobalNamespace ->
genTriviaForOption SynModuleOrNamespace_Namespace namespaceRange !- "namespace"
+> !- " global"
| SynModuleOrNamespaceKind.AnonModule -> sepNone
and genModuleOrNamespace
astContext
(ModuleOrNamespace (ats, px, moduleRange, namespaceRange, ao, lids, mds, isRecursive, moduleKind, range))
=
let sepModuleAndFirstDecl =
let firstDecl = List.tryHead mds
match firstDecl with
| None -> sepNone
| Some mdl ->
sepNln
+> sepNlnConsideringTriviaContentBeforeFor (synModuleDeclToFsAstType mdl) mdl.Range
let moduleOrNamespace =
genModuleOrNamespaceKind moduleRange namespaceRange moduleKind
+> opt sepSpace ao genAccess
+> ifElse isRecursive (!- "rec ") sepNone
+> genLongIdent lids
// 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
| [ ident ] ->
genTriviaFor Ident_ ident.idRange sepNone
|> genTriviaFor LongIdent_ ident.idRange
| _ -> sepNone
genPreXmlDoc px
+> genAttributes astContext ats
+> ifElse
(moduleKind = SynModuleOrNamespaceKind.AnonModule)
genTriviaForAnonModuleIdent
(moduleOrNamespace +> sepModuleAndFirstDecl)
+> genModuleDeclList astContext mds
|> (match moduleKind with
| SynModuleOrNamespaceKind.AnonModule -> genTriviaFor SynModuleOrNamespace_AnonModule range
| SynModuleOrNamespaceKind.DeclaredNamespace -> genTriviaFor SynModuleOrNamespace_DeclaredNamespace range
| SynModuleOrNamespaceKind.GlobalNamespace -> genTriviaFor SynModuleOrNamespace_GlobalNamespace range
| SynModuleOrNamespaceKind.NamedModule -> genTriviaFor SynModuleOrNamespace_NamedModule range)
and genSigModuleOrNamespace
astContext
(SigModuleOrNamespace (ats, px, moduleRange, namespaceRange, ao, lids, mds, isRecursive, moduleKind, range))
=
let sepModuleAndFirstDecl =
let firstDecl = List.tryHead mds
match firstDecl with
| None -> sepNone
| Some mdl ->
match mdl with
| SynModuleSigDecl.Types _ -> sepNlnConsideringTriviaContentBeforeFor SynModuleSigDecl_Types mdl.Range
| SynModuleSigDecl.Val _ -> sepNlnConsideringTriviaContentBeforeFor SynModuleSigDecl_Val mdl.Range
| _ -> sepNone
+> sepNln
let moduleOrNamespace =
genModuleOrNamespaceKind moduleRange namespaceRange moduleKind
+> opt sepSpace ao genAccess
+> ifElse isRecursive (!- "rec ") sepNone
+> genLongIdent lids
genPreXmlDoc px
+> genAttributes astContext ats
+> ifElse (moduleKind = SynModuleOrNamespaceKind.AnonModule) sepNone (moduleOrNamespace +> sepModuleAndFirstDecl)
+> genSigModuleDeclList astContext mds
|> (match moduleKind with
| SynModuleOrNamespaceKind.AnonModule -> genTriviaFor SynModuleOrNamespaceSig_AnonModule range
| SynModuleOrNamespaceKind.DeclaredNamespace -> genTriviaFor SynModuleOrNamespaceSig_DeclaredNamespace range
| SynModuleOrNamespaceKind.GlobalNamespace -> genTriviaFor SynModuleOrNamespaceSig_GlobalNamespace range
| SynModuleOrNamespaceKind.NamedModule -> genTriviaFor SynModuleOrNamespaceSig_NamedModule range)
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, triviaType =
List.head xs |> fun mdl -> mdl.Range, synModuleDeclToFsAstType mdl
// SynModuleDecl.Open cannot have attributes
let sepNln = sepNlnConsideringTriviaContentBeforeFor triviaType 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 = sepNlnConsideringTriviaContentBeforeFor SynModuleDecl_HashDirective r
collectItems ys (fun ysItems -> ColMultilineItem(expr, sepNln) :: ysItems |> finalContinuation)
| AttributesL (xs, y :: rest) ->
let expr =
col sepNln xs (genModuleDecl astContext)
+> sepNlnConsideringTriviaContentBeforeFor (synModuleDeclToFsAstType y) y.Range
+> genModuleDecl astContext y
let r = List.head xs |> fun mdl -> mdl.Range
let sepNln = sepNlnConsideringTriviaContentBeforeFor SynModuleDecl_Attributes r
collectItems rest (fun restItems -> ColMultilineItem(expr, sepNln) :: restItems |> finalContinuation)
| m :: rest ->
let sepNln =
sepNlnConsideringTriviaContentBeforeFor (synModuleDeclToFsAstType m) m.Range
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, triviaType =
List.head xs |> fun mdl -> mdl.Range, synModuleSigDeclToFsAstType mdl
// SynModuleSigDecl.Open cannot have attributes
let sepNln = sepNlnConsideringTriviaContentBeforeFor triviaType r
collectItems ys (fun ysItems -> ColMultilineItem(expr, sepNln) :: ysItems |> finalContinuation)
| SigHashDirectiveL (xs, ys) ->
let expr = col sepNln xs (genSigModuleDecl astContext)
let r = List.head xs |> fun mdl -> mdl.Range
let sepNln =
sepNlnConsideringTriviaContentBeforeFor SynModuleSigDecl_HashDirective r
collectItems ys (fun ysItems -> ColMultilineItem(expr, sepNln) :: ysItems |> finalContinuation)
| s :: rest ->
let sepNln =
sepNlnConsideringTriviaContentBeforeFor (synModuleSigDeclToFsAstType s) s.Range
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: Context) ->
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
(sepNlnConsideringTriviaContentBeforeFor SynModuleDecl_Attributes a.Range)
+> ((col sepNln a.Attributes (genAttribute astContext))
|> genTriviaFor SynAttributeList_ a.Range)
let hasContentAfter = ctx.HasContentAfter(SynAttributeList_, a.Range)
(hasContentAfter, prevExpr +> expr))
(true, sepNone)
ats
|> snd
attributesExpr ctx
| DeclExpr e -> genExpr astContext e
| Exception ex -> genException astContext ex
| HashDirective p -> genParsedHashDirective p
| Extern (ats, px, ao, t, sli, ps) ->
genPreXmlDoc px
+> genAttributes astContext ats
+> !- "extern "
+> genType { astContext with IsCStylePattern = true } false t
+> sepSpace
+> opt sepSpace ao genAccess
+> genSynLongIdent false sli
+> sepOpenT
+> col sepComma ps (genPat { astContext with IsCStylePattern = true })
+> sepCloseT
// Add a new line after module-level let bindings
| Let b -> genLetBinding astContext "let " b
| LetRec (b :: bs) ->
let sepBAndBs =
match List.tryHead bs with
| Some b' ->
let r = b'.RangeOfBindingWithRhs
sepNln +> sepNlnConsideringTriviaContentBeforeFor (synBindingToFsAstType b) r
| None -> id
genLetBinding astContext "let rec " b
+> sepBAndBs
+> colEx
(fun (b': SynBinding) ->
let r = b'.RangeOfBindingWithRhs
sepNln +> sepNlnConsideringTriviaContentBeforeFor (synBindingToFsAstType b) r)
bs
(fun andBinding ->
enterNodeFor (synBindingToFsAstType b) andBinding.RangeOfBindingWithRhs
+> genLetBinding astContext "and " andBinding)
| ModuleAbbrev (ident, lid) -> !- "module " +> genIdent ident +> sepEq +> sepSpace +> genLongIdent lid
| NamespaceFragment m -> failwithf "NamespaceFragment hasn't been implemented yet: %O" m
| NestedModule (ats, px, moduleKeyword, ao, lid, isRecursive, equalsRange, mds) ->
genPreXmlDoc px
+> genAttributes astContext ats
+> genTriviaForOption SynModuleDecl_NestedModule_Module moduleKeyword (!- "module ")
+> opt sepSpace ao genAccess
+> ifElse isRecursive (!- "rec ") sepNone
+> genLongIdent lid
+> genEq SynModuleDecl_NestedModule_Equals equalsRange
+> indent
+> sepNln
+> genModuleDeclList astContext mds
+> unindent
| Open lid -> !- "open " +> genSynLongIdent false lid
| OpenType lid -> !- "open type " +> genSynLongIdent false lid
// There is no nested types and they are recursive if there are more than one definition
| Types (t :: ts) ->
let items =
ColMultilineItem(genTypeDefn astContext true t, sepNone)
:: (List.map
(fun t ->
ColMultilineItem(
genTypeDefn astContext false t,
sepNlnConsideringTriviaContentBeforeFor SynTypeDefn_ 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 (ident, lid) -> !- "module " +> genIdent ident +> sepEq +> sepSpace +> genLongIdent lid
| SigNamespaceFragment m -> failwithf "NamespaceFragment is not supported yet: %O" m
| SigNestedModule (ats, px, moduleKeyword, ao, lid, equalsRange, mds) ->
genPreXmlDoc px
+> genAttributes astContext ats
+> genTriviaForOption SynModuleSigDecl_NestedModule_Module moduleKeyword !- "module "
+> opt sepSpace ao genAccess
+> genLongIdent lid
+> genEq SynModuleSigDecl_NestedModule_Equals equalsRange
+> indent
+> sepNln
+> genSigModuleDeclList astContext mds
+> unindent
| SigOpen lid -> !- "open " +> genSynLongIdent false lid
| SigOpenType sli -> !- "open type " +> genSynLongIdent false sli
| SigTypes (t :: ts) ->
let items =
ColMultilineItem(genSigTypeDefn astContext true t, sepNone)
:: (List.map
(fun (t: SynTypeDefnSig) ->
let sepNln = sepNlnConsideringTriviaContentBeforeFor SynTypeDefnSig_ t.Range
ColMultilineItem(genSigTypeDefn astContext false t, sepNln))
ts)
colWithNlnWhenItemIsMultilineUsingConfig items
| md -> failwithf "Unexpected module signature declaration: %O" md
|> genTriviaFor (synModuleSigDeclToFsAstType node) node.Range
and genIdent (ident: Ident) =
let width = ident.idRange.EndColumn - ident.idRange.StartColumn
let genIdent =
if ident.idText.Length + 4 = width then
// add backticks
!- $"``{ident.idText}``"
else
!-ident.idText
genTriviaFor Ident_ ident.idRange genIdent
and genLongIdent (lid: LongIdent) =
col sepDot lid genIdent |> genTriviaFor LongIdent_ (longIdentFullRange lid)
and genSynIdent (addDot: bool) (synIdent: SynIdent) =
let (SynIdent (ident, trivia)) = synIdent
match trivia with
| Some (IdentTrivia.OriginalNotation text) -> !-text
| Some (IdentTrivia.OriginalNotationWithParen (_, text, _)) -> !- $"({text})"
| Some (IdentTrivia.HasParenthesis _) -> !- $"({ident.idText})"
| None -> genIdent ident
|> fun genSy -> genTriviaFor SynIdent_ synIdent.FullRange (onlyIf addDot sepDot +> genSy)
and genSynLongIdent (addLeadingDot: bool) (longIdent: SynLongIdent) =
let lastIndex = longIdent.IdentsWithTrivia.Length - 1
coli sepNone longIdent.IdentsWithTrivia (fun idx si ->
genSynIdent (addLeadingDot || idx > 0) si
+> onlyIf (idx < lastIndex) (sepNlnWhenWriteBeforeNewlineNotEmpty sepNone))
|> genTriviaFor SynLongIdent_ longIdent.FullRange
and genSynLongIdentMultiline (addLeadingDot: bool) (longIdent: SynLongIdent) =
coli sepNln longIdent.IdentsWithTrivia (fun idx -> genSynIdent (idx > 0 || addLeadingDot))
|> genTriviaFor SynLongIdent_ longIdent.FullRange
and genAccess (vis: SynAccess) =
match vis with
| SynAccess.Public r -> genTriviaFor SynAccess_Public r !- "public"
| SynAccess.Internal r -> genTriviaFor SynAccess_Internal r !- "internal"
| SynAccess.Private r -> genTriviaFor SynAccess_Private r !- "private"
and genAttribute astContext (Attribute (sli, e, target)) =
match e with
// Special treatment for function application on attributes
| ConstUnitExpr -> !- "[<" +> opt sepColon target genIdent +> genSynLongIdent false sli +> !- ">]"
| e ->
let argSpacing = if hasParenthesis e then id else sepSpace
!- "[<"
+> opt sepColon target genIdent
+> genSynLongIdent false sli
+> argSpacing
+> genExpr astContext e
+> !- ">]"
and genAttributesCore astContext (ats: SynAttribute seq) =
let genAttributeExpr astContext (Attribute (sli, e, target) as attr) =
match e with
| ConstUnitExpr -> opt sepColon target genIdent +> genSynLongIdent false sli
| e ->
let argSpacing = if hasParenthesis e then id else sepSpace
opt sepColon target genIdent
+> genSynLongIdent false sli
+> 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: SynAttributeList) -> 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) =
colPost sepNlnUnlessLastEventIsNewline sepNln ats (fun a ->
(genAttributesCore astContext a.Attributes
|> genTriviaFor SynAttributeList_ a.Range)
+> sepNlnWhenWriteBeforeNewlineNotEmpty sepNone)
and genPreXmlDoc (PreXmlDoc (lines, _)) =
colPost sepNln sepNln lines (sprintf "///%s" >> (!-))
and genExprSepEqPrependType
(astContext: ASTContext)
(equalsAstType: FsAstType)
(equalsRange: range option)
(e: SynExpr)
=
match e with
| TypedExpr (Typed, e, t) ->
sepColon
+> genType astContext false t
+> genEq equalsAstType equalsRange
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| _ ->
genEq equalsAstType equalsRange
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
and genTyparList astContext tps =
colSurr sepOpenT sepCloseT wordOr tps (genTypar astContext)
and genTypeSupportMember astContext st =
match st with
| SynType.Var (td, _) -> genTypar astContext td
| TLongIdent sli -> genSynLongIdent false sli
| _ -> !- ""
and genTypeSupportMemberList astContext tps =
colSurr sepOpenT sepCloseT wordOr tps (genTypeSupportMember astContext)
and genTypeAndParam astContext (typeName: Context -> Context) (tds: SynTyparDecls option) tcs =
let types openSep tds tcs closeSep =
(openSep
+> coli sepComma tds (fun i -> genTyparDecl { astContext with IsFirstTypeParam = i = 0 })
+> genSynTypeConstraintList astContext tcs
+> closeSep)
match tds with
| None -> typeName
| Some (PostfixList (gt, tds, tcs, lt, _)) ->
typeName
+> types
(genTriviaFor SynTyparDecls_PostfixList_Greater gt !- "<")
tds
tcs
(genTriviaFor SynTyparDecls_PostfixList_Lesser lt !- ">")
| Some (SynTyparDecls.PostfixList _) -> sepNone // captured above
| Some (SynTyparDecls.PrefixList (tds, _range)) -> types (!- "(") tds [] (!- ")") +> !- " " +> typeName
| Some (SynTyparDecls.SinglePrefix (td, _range)) ->
genTyparDecl { astContext with IsFirstTypeParam = true } td
+> sepSpace
+> typeName
+> colPre (!- " when ") wordAnd tcs (genTypeConstraint astContext)
and genTypeParamPostfix astContext tds =
match tds with
| Some (PostfixList (gt, tds, tcs, lt, _range)) ->
(genTriviaFor SynTyparDecls_PostfixList_Greater gt !- "<")
+> coli sepComma tds (fun i -> genTyparDecl { astContext with IsFirstTypeParam = i = 0 })
+> genSynTypeConstraintList astContext tcs
+> (genTriviaFor SynTyparDecls_PostfixList_Lesser lt !- ">")
| _ -> sepNone
and genSynTypeConstraintList astContext tcs =
match tcs with
| [] -> sepNone
| _ ->
let short =
colPre (sepSpace +> !- "when ") wordAnd tcs (genTypeConstraint astContext)
let long =
colPre (!- "when ") (sepNln +> wordAndFixed +> sepSpace) tcs (genTypeConstraint astContext)
autoIndentAndNlnIfExpressionExceedsPageWidth (expressionFitsOnRestOfLine short long)
and genLetBinding astContext pref b =
let genPref letKeyword =
genTriviaForOption SynBinding_Let letKeyword !-pref
let isRecursiveLetOrUseFunction = (pref = "and ")
match b with
| LetBinding (ats, px, letKeyword, ao, isInline, isMutable, p, equalsRange, e, valInfo) ->
match e, p with
| TypedExpr (Typed, e, t), PatLongIdent (ao, sli, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunctionWithReturnType
astContext
false
isRecursiveLetOrUseFunction
px
ats
(genPref letKeyword)
ao
isInline
isMutable
sli
p.Range
ps
tpso
t
valInfo
equalsRange
e
| e, PatLongIdent (ao, sli, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunction
astContext
false
isRecursiveLetOrUseFunction
px
ats
(genPref letKeyword)
ao
isInline
isMutable
sli
p.Range
ps
tpso
equalsRange
e
| TypedExpr (Typed, e, t), pat ->
genSynBindingValue
astContext
isRecursiveLetOrUseFunction
px
ats
(genPref letKeyword)
ao
isInline
isMutable
pat
(Some t)
equalsRange
e
| _, PatTuple _ ->
genLetBindingDestructedTuple
astContext
isRecursiveLetOrUseFunction
px
ats
pref
ao
isInline
isMutable
p
equalsRange
e
| _, pat ->
genSynBindingValue
astContext
isRecursiveLetOrUseFunction
px
ats
(genPref letKeyword)
ao
isInline
isMutable
pat
None
equalsRange
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.RangeOfBindingWithRhs
and genProperty astContext (getOrSetType: FsAstType, getOrSetRange: range, binding: SynBinding) =
let genGetOrSet =
let getOrSetText =
match getOrSetType with
| SynMemberDefn_GetSetMember_Get -> "get"
| SynMemberDefn_GetSetMember_Set -> "set"
| _ -> failwith "expected \"get\" or \"set\""
genTriviaFor getOrSetType getOrSetRange !-getOrSetText +> sepSpace
match binding with
| SynBinding (headPat = PatLongIdent (ao, _, ps, _); expr = e; trivia = { EqualsRange = equalsRange }) ->
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
opt sepSpace ao genAccess
+> genGetOrSet
+> ifElse
(List.atMostOne ps)
(col sepComma ps (genPat astContext) +> sepSpace)
(sepOpenT +> col sepComma ps (genPat astContext) +> sepCloseT +> sepSpace)
+> genPat astContext p
+> genExprSepEqPrependType astContext SynBinding_Equals equalsRange e
| ps ->
opt sepSpace ao genAccess
+> genGetOrSet
+> col sepSpace ps (fun (_, pat) -> genPat astContext pat)
+> genExprSepEqPrependType astContext SynBinding_Equals equalsRange e
| _ -> sepNone
and genMemberBindingList astContext ms =
ms
|> List.map (fun (mb: SynBinding) ->
let expr = genMemberBinding astContext mb
let r = mb.RangeOfBindingWithRhs
let sepNln = sepNlnConsideringTriviaContentBeforeFor (synBindingToFsAstType mb) r
ColMultilineItem(expr, sepNln))
|> colWithNlnWhenItemIsMultiline
and genMemberBinding astContext b =
match b with
| MemberBinding (ats, px, ao, isInline, mf, p, equalsRange, e, synValInfo) ->
let prefix = genMemberFlags mf
genMemberBindingImpl astContext prefix ats px ao isInline p equalsRange e synValInfo
| ExplicitCtor (ats, px, ao, p, equalsRange, e, io) ->
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
+> optSingle (fun ident -> !- " as " +> genIdent ident) io
match e with
// Handle special "then" block i.e. fake sequential expressions in constructors
| Sequential (e1, e2, false) ->
prefix
+> genEq SynBinding_Equals equalsRange
+> indent
+> sepNln
+> genExpr astContext e1
+> sepNln
+> !- "then "
+> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e2)
+> unindent
| e ->
prefix
+> genEq SynBinding_Equals equalsRange
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
| b -> failwithf "%O isn't a member binding" b
|> genTriviaFor (synBindingToFsAstType b) b.RangeOfBindingWithRhs
and genMemberBindingImpl
(astContext: ASTContext)
(prefix: Context -> Context)
(ats: SynAttributes)
(px: PreXmlDoc)
(ao: SynAccess option)
(isInline: bool)
(p: SynPat)
(equalsRange: range option)
(e: SynExpr)
(synValInfo: SynValInfo)
=
match e, p with
| TypedExpr (Typed, e, t), PatLongIdent (ao, s, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunctionWithReturnType
astContext
true
false
px
ats
prefix
ao
isInline
false
s
p.Range
ps
tpso
t
synValInfo
equalsRange
e
| e, PatLongIdent (ao, s, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunction astContext true false px ats prefix ao isInline false s p.Range ps tpso equalsRange e
| TypedExpr (Typed, e, t), pat ->
genSynBindingValue astContext false px ats prefix ao isInline false pat (Some t) equalsRange e
| _, pat -> genSynBindingValue astContext false px ats prefix ao isInline false pat None equalsRange e
and genMemberFlags (mf: SynMemberFlags) =
match mf.Trivia with
| { StaticRange = Some s
MemberRange = Some _m } -> genTriviaFor SynMemberFlags_Static s !- "static" +> sepSpace +> !- "member "
| { OverrideRange = Some _o } -> !- "override "
| { DefaultRange = Some _d } -> !- "default "
| { AbstractRange = Some a
MemberRange = Some m } ->
genTriviaFor SynMemberFlags_Abstract a !- "abstract"
+> sepSpace
+> genTriviaFor SynMemberFlags_Member m !- "member "
| { MemberRange = Some m } -> genTriviaFor SynMemberFlags_Member m !- "member "
| { AbstractRange = Some a } -> genTriviaFor SynMemberFlags_Abstract a !- "abstract "
| _ -> sepNone
and genVal astContext (Val (ats, px, valKeyword, ao, si, t, vi, isInline, isMutable, tds, eo, range)) =
let typeName = genTypeAndParam astContext (genSynIdent false si) tds []
let (FunType namedArgs) = (t, vi)
let hasGenerics = Option.isSome tds
genPreXmlDoc px
+> genAttributes astContext ats
+> (genTriviaForOption SynValSig_Val valKeyword !- "val "
+> onlyIf isInline (!- "inline ")
+> onlyIf isMutable (!- "mutable ")
+> opt sepSpace ao genAccess
+> typeName)
+> 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 SynValSig_ range
and genRecordFieldName astContext (SynExprRecordField ((rfn, _), equalsRange, eo, _blockSeparator) as rf) =
opt sepNone eo (fun e ->
let expr = sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
genSynLongIdent false rfn +> genEq SynExprRecordField_Equals equalsRange +> expr)
|> genTriviaFor SynExprRecordField_ rf.FullRange
and genAnonRecordFieldName astContext (AnonRecordFieldName (ident, equalsRange, e, range)) =
let expr = sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
genIdent ident +> genEq SynExpr_AnonRecd_Field_Equals equalsRange +> expr
|> genTriviaFor SynExpr_AnonRecd_Field range
and genTuple astContext es =
let genShortExpr astContext e =
addParenForTupleWhen (genExpr astContext) e
let shortExpression = col sepComma es (genShortExpr astContext)
let longExpression = genTupleMultiline astContext es
atCurrentColumn (expressionFitsOnRestOfLine shortExpression longExpression)
and genTupleMultiline astContext es =
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
(sepCommaFixed +> sepNln)
let lastIndex = List.length es - 1
let genExpr astContext idx e =
match e with
| SynExpr.IfThenElse _ when (idx < lastIndex) ->
autoParenthesisIfExpressionExceedsPageWidth (genExpr astContext e)
| InfixApp (equal, operatorSli, e1, e2, range) when (equal = "=") ->
genNamedArgumentExpr astContext operatorSli e1 e2 range
| _ -> genExpr astContext e
coli sep es (genExpr astContext)
and genNamedArgumentExpr (astContext: ASTContext) (operatorSli: SynLongIdent) e1 e2 appRange =
let short =
genExpr astContext e1
+> sepSpace
+> genSynLongIdent false operatorSli
+> sepSpace
+> genExpr astContext e2
let long =
genExpr astContext e1
+> sepSpace
+> genSynLongIdent false operatorSli
+> autoIndentAndNlnExpressUnlessStroustrup (fun e -> sepSpace +> genExpr astContext e) e2
expressionFitsOnRestOfLine short long |> genTriviaFor SynExpr_App appRange
and genExpr astContext synExpr ctx =
let expr =
match synExpr with
| LazyExpr (lazyKeyword, e) ->
let isInfixExpr =
match e with
| InfixApp _ -> 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 (genExpr astContext e)
genTriviaFor SynExpr_Lazy_Lazy lazyKeyword !- "lazy "
+> ifElse isInfixExpr genInfixExpr genNonInfixExpr
| SingleExpr (kind, e) ->
let mapping =
(match kind with
| YieldFrom _
| Yield _
| Return _
| ReturnFrom _
| Do _
| DoBang _ -> autoIndentAndNlnIfExpressionExceedsPageWidthUnlessStroustrup (genExpr astContext) e
| _ -> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e))
match kind with
| InferredDowncast downcastKeyword ->
genTriviaFor SynExpr_InferredDowncast_Downcast downcastKeyword !- "downcast "
| InferredUpcast upcastKeyword -> genTriviaFor SynExpr_InferredUpcast_Upcast upcastKeyword !- "upcast "
| Assert assertKeyword -> genTriviaFor SynExpr_Assert_Assert assertKeyword !- "assert "
| AddressOfSingle ampersandToken -> genTriviaFor SynExpr_AddressOf_SingleAmpersand ampersandToken !- "&"
| AddressOfDouble ampersandToken -> genTriviaFor SynExpr_AddressOf_DoubleAmpersand ampersandToken !- "&&"
| Yield yieldKeyword -> genTriviaFor SynExpr_YieldOrReturn_Yield yieldKeyword !- "yield "
| Return returnKeyword -> genTriviaFor SynExpr_YieldOrReturn_Return returnKeyword !- "return "
| YieldFrom yieldBangKeyword ->
genTriviaFor SynExpr_YieldOrReturnFrom_YieldBang yieldBangKeyword !- "yield! "
| ReturnFrom returnBangKeyword ->
genTriviaFor SynExpr_YieldOrReturnFrom_ReturnBang returnBangKeyword !- "return! "
| Do doKeyword -> genTriviaFor SynExpr_Do_Do doKeyword !- "do "
| DoBang doBangKeyword -> genTriviaFor SynExpr_DoBang_DoBang doBangKeyword !- "do! "
| Fixed fixedKeyword -> genTriviaFor SynExpr_Fixed_Fixed fixedKeyword !- "fixed "
+> mapping
| ConstExpr (c, r) -> genConst c r
| NullExpr -> !- "null"
// Not sure about the role of e1
| Quote (_, e2, isRaw) ->
let e =
expressionFitsOnRestOfLine
(genExpr astContext e2)
(indent +> sepNln +> genExpr astContext e2 +> unindent +> sepNln)
ifElse
isRaw
(!- "<@@" +> sepSpace +> e +> sepSpace +> !- "@@>")
(!- "<@" +> sepSpace +> e +> sepSpace +> !- "@>")
| TypedExpr (TypeTest, e, t) -> genExpr astContext e +> !- " :? " +> genType astContext false t
| TypedExpr (Downcast, e, t) ->
let shortExpr = genExpr astContext e +> !- " :?> " +> genType astContext false t
let longExpr =
genExpr astContext e +> sepNln +> !- ":?> " +> genType astContext false t
expressionFitsOnRestOfLine shortExpr longExpr
| TypedExpr (Upcast, e, t) ->
let shortExpr = genExpr astContext e +> !- " :> " +> genType astContext false t
let longExpr =
genExpr astContext e +> sepNln +> !- ":> " +> genType astContext false t