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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.Syntax
open FSharp.Compiler.Xml
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
/// Please avoid using this record as it can be the cause of unexpected behavior when used incorrectly
type ASTContext =
{ /// 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 =
{ 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
+> 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 (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, range)) =
let sepModuleAndFirstDecl =
let firstDecl = List.tryHead mds
match firstDecl with
| None -> sepNone
| Some mdl ->
sepNln
+> sepNlnConsideringTriviaContentBeforeForMainNode (synModuleDeclToFsAstType mdl) mdl.Range
let lidsFullRange =
match lids with
| [] -> FSharp.Compiler.Text.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 = SynModuleOrNamespaceKind.AnonModule) genTriviaForAnonModuleIdent moduleOrNamespace
+> sepModuleAndFirstDecl
+> genModuleDeclList astContext mds
|> (match moduleKind with
| SynModuleOrNamespaceKind.AnonModule -> id
| SynModuleOrNamespaceKind.DeclaredNamespace -> genTriviaFor SynModuleOrNamespace_DeclaredNamespace range
| SynModuleOrNamespaceKind.GlobalNamespace -> genTriviaFor SynModuleOrNamespace_GlobalNamespace range
| SynModuleOrNamespaceKind.NamedModule -> genTriviaFor SynModuleOrNamespace_NamedModule range)
and genSigModuleOrNamespace astContext (SigModuleOrNamespace (ats, px, 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 _ ->
sepNlnConsideringTriviaContentBeforeForMainNode SynModuleSigDecl_Types mdl.Range
| SynModuleSigDecl.Val _ -> sepNlnConsideringTriviaContentBeforeForMainNode SynValSig_ mdl.Range
| _ -> sepNone
+> sepNln
let lidsFullRange =
match lids with
| [] -> FSharp.Compiler.Text.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 = SynModuleOrNamespaceKind.AnonModule) sepNone moduleOrNamespace
+> sepModuleAndFirstDecl
+> genSigModuleDeclList astContext mds
|> (match moduleKind with
| SynModuleOrNamespaceKind.DeclaredNamespace -> genTriviaFor SynModuleOrNamespaceSig_DeclaredNamespace range
| SynModuleOrNamespaceKind.GlobalNamespace -> genTriviaFor SynModuleOrNamespaceSig_GlobalNamespace range
| SynModuleOrNamespaceKind.NamedModule -> genTriviaFor SynModuleOrNamespaceSig_NamedModule range
| _ -> id)
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 expr =
col sepNln xs (genModuleDecl astContext)
+> sepNlnConsideringTriviaContentBeforeForMainNode (synModuleDeclToFsAstType y) y.Range
+> 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 sepNln =
sepNlnConsideringTriviaContentBeforeForMainNode (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 = 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 sepNln =
sepNlnConsideringTriviaContentBeforeForMainNode (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 ->
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 "let " b
| LetRec (b :: bs) ->
let sepBAndBs =
match List.tryHead bs with
| Some b' ->
let r = b'.RangeOfBindingWithRhs
sepNln
+> sepNlnConsideringTriviaContentBeforeForMainNode (synBindingToFsAstType b) r
| None -> id
genLetBinding astContext "let rec " b
+> sepBAndBs
+> colEx
(fun (b': SynBinding) ->
let r = b'.RangeOfBindingWithRhs
sepNln
+> sepNlnConsideringTriviaContentBeforeForMainNode (synBindingToFsAstType b) r)
bs
(fun andBinding ->
enterNodeFor (synBindingToFsAstType b) andBinding.RangeOfBindingWithRhs
+> genLetBinding astContext "and " andBinding)
| ModuleAbbrev (s1, s2) -> !- "module " -- s1 +> sepEq +> sepSpace -- s2
| NamespaceFragment m -> failwithf "NamespaceFragment hasn't been implemented yet: %O" m
| NestedModule (ats, px, moduleKeyword, ao, s, isRecursive, equalsRange, mds) ->
genPreXmlDoc px
+> genAttributes astContext ats
+> genTriviaForOption SynModuleDecl_NestedModule_Module moduleKeyword (!- "module ")
+> opt sepSpace ao genAccess
+> ifElse isRecursive (!- "rec ") sepNone
-- s
+> genEq SynModuleDecl_NestedModule_Equals equalsRange
+> 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 true t, sepNone)
:: (List.map
(fun t ->
ColMultilineItem(
genTypeDefn astContext false t,
sepNlnConsideringTriviaContentBeforeForMainNode 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 (s1, s2) -> !- "module " -- s1 +> sepEq +> sepSpace -- s2
| SigNamespaceFragment m -> failwithf "NamespaceFragment is not supported yet: %O" m
| SigNestedModule (ats, px, moduleKeyword, ao, s, equalsRange, mds) ->
genPreXmlDoc px
+> genAttributes astContext ats
+> genTriviaForOption SynModuleSigDecl_NestedModule_Module moduleKeyword !- "module "
+> opt sepSpace ao genAccess
-- s
+> genEq SynModuleSigDecl_NestedModule_Equals equalsRange
+> 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 true t, sepNone)
:: (List.map
(fun (t: SynTypeDefnSig) ->
let sepNln = sepNlnConsideringTriviaContentBeforeForMainNode SynTypeDefnSig_ t.Range
ColMultilineItem(genSigTypeDefn astContext 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: 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) =
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, _)) =
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 s -> !-s
| _ -> !- ""
and genTypeSupportMemberList astContext tps =
colSurr sepOpenT sepCloseT wordOr tps (genTypeSupportMember astContext)
and genTypeAndParam astContext typeName (tds: SynTyparDecls option) tcs =
let types openSep tds tcs closeSep =
(!-openSep
+> coli sepComma tds (fun i -> genTyparDecl { astContext with IsFirstTypeParam = i = 0 })
+> colPre (!- " when ") wordAnd tcs (genTypeConstraint astContext)
-- closeSep)
match tds with
| None -> !-typeName
| Some (SynTyparDecls.PostfixList (tds, tcs, _range)) -> !-typeName +> types "<" tds tcs ">"
| 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 (SynTyparDecls.PostfixList (tds, tcs, _range)) ->
(!- "<"
+> coli sepComma tds (fun i -> genTyparDecl { astContext with IsFirstTypeParam = i = 0 })
+> colPre (!- " when ") wordAnd tcs (genTypeConstraint astContext)
-- ">")
| _ -> sepNone
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, s, _, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunctionWithReturnType
astContext
false
isRecursiveLetOrUseFunction
px
ats
(genPref letKeyword)
ao
isInline
isMutable
s
p.Range
ps
tpso
t
valInfo
equalsRange
e
| e, PatLongIdent (ao, s, _, ps, tpso) when (List.isNotEmpty ps) ->
genSynBindingFunction
astContext
false
isRecursiveLetOrUseFunction
px
ats
(genPref letKeyword)
ao
isInline
isMutable
s
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
(prefix: Context -> Context)
ao
propertyKind
ps
(equalsAstType: FsAstType)
(equalsRange: range option)
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 equalsAstType equalsRange e
| ps ->
prefix +> opt sepSpace ao genAccess
-- propertyKind
+> col sepSpace ps (genPat astContext)
+> genExprSepEqPrependType astContext equalsAstType equalsRange e
and genPropertyWithGetSet astContext (b1, b2) =
match b1, b2 with
| PropertyBinding (ats, px, ao, isInline, mf1, PatLongIdent (ao1, s1, pk1, ps1, _), eqR1, e1, _),
PropertyBinding (_, _, _, _, _, PatLongIdent (ao2, _, pk2, ps2, _), eqR2, e2, _) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats
+> genMemberFlags 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
let genGet okw ikw =
genProperty astContext (genPropertyKeyword (okw, ikw)) ao1 "get " ps1 SynBinding_Equals eqR1 e1
let genSet okw ikw =
genProperty astContext (genPropertyKeyword (okw, ikw)) ao2 "set " ps2 SynBinding_Equals eqR2 e2
let w = "with"
let a = "and"
let genGetSet =
// regardless of get/set ordering, the second member needs to be rendered as keyword "and", not keyword "with".
// therefore, the genGet and genSet helper functions have to take the desired keyword as a parameter.
match pk2 with
| Some (PropertyKeyword.With _) -> genSet w pk1 +> sepNln +> genGet a pk2
| _ -> genGet w pk1 +> sepNln +> genSet a pk2
prefix
+> !-s1
+> indent
+> sepNln
+> genGetSet
+> unindent
| _ -> sepNone
/// <summary>Generate the keyword <code>and</code> or <code>with</code>, along with any matching syntax trivia, for a given keyword</summary>
/// <param name="outputKeyword">the keyword that the user wants for the property after writing.</param>
/// <param name="inputKeyword">the parsed keyword range for the property from the AST. this is used to lookup trivia based on its range, since this range can differ from the output keyword's range.</param>
/// <param name="ctx">the writing context context, not used inside this function</param>
/// <remarks>The output keyword and input keyword can be different in the case of a property where the getter and setter are defined separately.
/// Fantomas will combine the definitions, each of which are defined as <code>member blah with get</code>, <code>member blah with get</code>,
/// into a combined getter and setter on a single member. This means that one of the <code>with</code> must be rewritten as an <code>and</code>,
/// but we need to preserve the trivia.</remarks>
/// <returns>A function that will transform and rewrite the member property keywords.</returns>
and genPropertyKeyword (outputKeyword: string, inputKeyword: PropertyKeyword option) (ctx: Context) =
let start = outputKeyword + " "
match inputKeyword with
| None -> ctx
| Some (PropertyKeyword.And r) -> (!-start |> genTriviaFor SynPat_LongIdent_And r) ctx
| Some (PropertyKeyword.With r) -> (!-start |> genTriviaFor SynPat_LongIdent_With r) ctx
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.RangeOfBindingWithRhs
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, equalsRange, e, synValInfo) ->
let prefix =
genPreXmlDoc px
+> genAttributes astContext ats
+> genMemberFlags 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, propertyKeyword, 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
let pat =
match p with
| SynPat.LongIdent (lid, propertyKeyword, extraId, typarDecls, _, accessibility, range) ->
SynPat.LongIdent(
lid,
propertyKeyword,
extraId,
typarDecls,
SynArgPats.Pats([]),
accessibility,
range
)
| _ -> p
let prefix =
(onlyIfNot mf.IsInstance (!- "static ")
+> !- "member ")
genMemberBindingImpl astContext prefix ats px ao isInline pat equalsRange e synValInfo
| _ ->
let ps = List.map snd ps
let genPropertyKeyword ctx =
match propertyKeyword with
| None -> ctx
| Some (PropertyKeyword.And r) ->
// even if the keyword was `and` in the original source, due to transformations we always want to use `with` here.
(!- "with " |> genTriviaFor SynPat_LongIdent_And r) ctx
| Some (PropertyKeyword.With r) -> (!- "with " |> genTriviaFor SynPat_LongIdent_With r) ctx
prefix -- s
+> indent
+> sepNln
+> genProperty astContext genPropertyKeyword ao propertyKind ps SynBinding_Equals equalsRange e
+> unindent
| p -> failwithf "Unexpected pattern: %O" p
| 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, 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
+> genEq SynBinding_Equals equalsRange
+> indent
+> sepNln
+> genExpr astContext e1
++ "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 SynValData_Static s !- "static"
+> sepSpace
+> !- "member "
| { OverrideRange = Some _o } -> !- "override "
| { DefaultRange = Some _d } -> !- "default "
| { AbstractRange = Some _a
MemberRange = Some _m } -> !- "abstract member "
| { MemberRange = Some m } -> genTriviaFor SynValData_Member m !- "member "
| { AbstractRange = Some _a } -> !- "abstract "
| _ -> sepNone
and genVal astContext (Val (ats, px, ao, s, identRange, t, vi, isInline, isMutable, tds, eo, range)) =
let typeName = genTypeAndParam astContext s tds []
let (FunType namedArgs) = (t, vi)
let hasGenerics = Option.isSome tds
genPreXmlDoc px
+> genAttributes astContext ats
+> (!- "val "
+> onlyIf isInline (!- "inline ")
+> onlyIf isMutable (!- "mutable ")
+> opt sepSpace ao genAccess
+> typeName
|> 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 SynValSig_ range
and genRecordFieldName
astContext
(SynExprRecordField ((LongIdentWithDots s as rfn, _), equalsRange, eo, _blockSeparator))
=
let range = rfn.Range
opt sepNone eo (fun e ->
let expr = sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
!-s
+> genEq RecordField_Equals equalsRange
+> expr)
|> genTriviaFor RecordField_ range
and genAnonRecordFieldName astContext (AnonRecordFieldName (s, r, equalsRange, e)) =
let expr = sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr astContext e)
genTriviaFor Ident_ r !-s
+> genEq SynExpr_AnonRecd_Field_Equals equalsRange
+> 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)