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CodePrinter.fs
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module internal rec Fantomas.Core.CodePrinter
open System
open Fantomas.Core.Context
open Fantomas.Core.SyntaxOak
open Microsoft.FSharp.Core.CompilerServices
let noBreakInfixOps = set [| "="; ">"; "<"; "%" |]
let newLineInfixOps = set [ "|>"; "||>"; "|||>"; ">>"; ">>=" ]
let rec (|UppercaseType|LowercaseType|) (t: Type) : Choice<unit, unit> =
let upperOrLower (v: string) =
let isUpper = Seq.tryHead v |> Option.map Char.IsUpper |> Option.defaultValue false
if isUpper then UppercaseType else LowercaseType
match t with
| Type.LongIdent node ->
let lastIdent =
List.tryFindBack
(function
| IdentifierOrDot.Ident _ -> true
| _ -> false)
node.Content
match lastIdent with
| Some(IdentifierOrDot.Ident ident) -> upperOrLower ident.Text
| _ -> LowercaseType
| Type.Var node -> upperOrLower (node.Text.Substring(1))
| Type.AppPostfix node -> (|UppercaseType|LowercaseType|) node.First
| Type.AppPrefix node -> (|UppercaseType|LowercaseType|) node.Identifier
| _ -> failwithf $"Cannot determine if synType %A{t} is uppercase or lowercase"
let rec (|UppercaseExpr|LowercaseExpr|) (expr: Expr) =
let upperOrLower (v: string) =
let isUpper = Seq.tryHead v |> Option.map Char.IsUpper |> Option.defaultValue false
if isUpper then UppercaseExpr else LowercaseExpr
let lastFragmentInList (identList: IdentListNode) =
match List.tryLast identList.Content with
| None
| Some(IdentifierOrDot.KnownDot _ | IdentifierOrDot.UnknownDot) -> LowercaseExpr
| Some(IdentifierOrDot.Ident node) -> upperOrLower node.Text
match expr with
| Expr.Ident ident -> upperOrLower ident.Text
| Expr.OptVar node -> lastFragmentInList node.Identifier
| Expr.Chain node ->
match List.tryLast node.Links with
| None
| Some(ChainLink.Dot _) -> LowercaseExpr
| Some(ChainLink.Identifier e)
| Some(ChainLink.Expr e) -> (|UppercaseExpr|LowercaseExpr|) e
| Some(ChainLink.AppParen appParen) -> (|UppercaseExpr|LowercaseExpr|) appParen.FunctionName
| Some(ChainLink.AppUnit appUnit) -> (|UppercaseExpr|LowercaseExpr|) appUnit.FunctionName
// Questionable
| Some(ChainLink.IndexExpr _) -> LowercaseExpr
| Expr.DotIndexedGet node -> (|UppercaseExpr|LowercaseExpr|) node.ObjectExpr
| Expr.TypeApp node -> (|UppercaseExpr|LowercaseExpr|) node.Identifier
| Expr.Dynamic node -> (|UppercaseExpr|LowercaseExpr|) node.FuncExpr
| Expr.AppSingleParenArg node -> (|UppercaseExpr|LowercaseExpr|) node.FunctionExpr
| Expr.Paren node -> (|UppercaseExpr|LowercaseExpr|) node.Expr
| Expr.App node -> (|UppercaseExpr|LowercaseExpr|) node.FunctionExpr
| _ -> failwithf "cannot determine if Expr %A is uppercase or lowercase" expr
let (|ParenExpr|_|) (e: Expr) =
match e with
| Expr.Paren _
| Expr.ParenLambda _
| Expr.ParenFunctionNameWithStar _
| Expr.Constant(Constant.Unit _) -> Some e
| _ -> None
let genTrivia (node: Node) (trivia: TriviaNode) (ctx: Context) =
let currentLastLine = ctx.WriterModel.Lines |> List.tryHead
// Some items like #if or Newline should be printed on a newline
// It is hard to always get this right in CodePrinter, so we detect it based on the current code.
let addNewline =
currentLastLine
|> Option.map (fun line -> line.Trim().Length > 0)
|> Option.defaultValue false
let addSpace =
currentLastLine
|> Option.bind (fun line -> Seq.tryLast line |> Option.map (fun lastChar -> lastChar <> ' '))
|> Option.defaultValue false
let gen =
match trivia.Content with
| LineCommentAfterSourceCode s ->
let comment = sprintf "%s%s" (if addSpace then " " else String.empty) s
writerEvent (WriteBeforeNewline comment)
| BlockComment(comment, before, after) ->
ifElse (before && addNewline) sepNlnForTrivia sepNone
+> sepSpace
+> !-comment
+> sepSpace
+> ifElse after sepNlnForTrivia sepNone
| CommentOnSingleLine s
| Directive s -> (ifElse addNewline sepNlnForTrivia sepNone) +> !-s +> sepNlnForTrivia
| Newline -> (ifElse addNewline (sepNlnForTrivia +> sepNlnForTrivia) sepNlnForTrivia)
| Cursor ->
fun ctx ->
// TODO: this assumes the cursor is placed on the same line as the EndLine of the Node.
let originalColumnOffset = trivia.Range.EndColumn - node.Range.EndColumn
let formattedCursor =
Fantomas.FCS.Text.Position.mkPos ctx.WriterModel.Lines.Length (ctx.Column + originalColumnOffset)
{ ctx with
FormattedCursor = Some formattedCursor }
gen ctx
let recordCursorNode f (node: Node) (ctx: Context) =
match node.TryGetCursor with
| None -> f ctx
| Some cursor ->
// TODO: this currently assume the node fits on a single line.
// This won't be accurate in case of a multiline string.
let currentStartLine = ctx.WriterModel.Lines.Length
let currentStartColumn = ctx.Column
let ctxAfter = f ctx
let formattedCursor =
let columnOffsetInSource = cursor.Column - node.Range.StartColumn
Fantomas.FCS.Text.Position.mkPos currentStartLine (currentStartColumn + columnOffsetInSource)
{ ctxAfter with
FormattedCursor = Some formattedCursor }
let enterNode<'n when 'n :> Node> (n: 'n) =
col sepNone n.ContentBefore (genTrivia n)
let leaveNode<'n when 'n :> Node> (n: 'n) =
col sepNone n.ContentAfter (genTrivia n)
let genNode<'n when 'n :> Node> (n: 'n) (f: Context -> Context) =
enterNode n +> recordCursorNode f n +> leaveNode n
let genSingleTextNode (node: SingleTextNode) = !-node.Text |> genNode node
// Alternative for genSingleTextNode to avoid a double space when the node has line comment after it.
let genSingleTextNodeWithSpaceSuffix (addSpace: Context -> Context) (node: SingleTextNode) =
(!-node.Text +> addSpace) |> genNode node
let genSingleTextNodeSuffixDelimiter (node: SingleTextNode) =
genSingleTextNodeWithSpaceSuffix addSpaceIfSpaceAroundDelimiter node
let genSingleTextNodeWithLeadingDot (node: SingleTextNode) = !- $".%s{node.Text}" |> genNode node
let genMultipleTextsNode (node: MultipleTextsNode) =
col sepSpace node.Content genSingleTextNode |> genNode node
let genIdentListNodeAux addLeadingDot (iln: IdentListNode) =
coli sepNone iln.Content (fun idx identOrDot ->
match identOrDot with
| IdentifierOrDot.Ident ident ->
if addLeadingDot && idx = 0 then
genSingleTextNodeWithLeadingDot ident +> sepNlnWhenWriteBeforeNewlineNotEmpty
else
genSingleTextNode ident +> sepNlnWhenWriteBeforeNewlineNotEmpty
| IdentifierOrDot.KnownDot dot -> genSingleTextNode dot
| IdentifierOrDot.UnknownDot -> sepDot)
|> genNode iln
let genIdentListNode iln = genIdentListNodeAux false iln
let genIdentListNodeWithDot iln = genIdentListNodeAux true iln
let genAccessOpt (nodeOpt: SingleTextNode option) =
match nodeOpt with
| None -> sepNone
| Some node -> genSingleTextNode node +> sepSpace
let genXml (node: XmlDocNode option) =
match node with
| None -> sepNone
| Some node -> col sepNln node.Lines (!-) +> sepNln |> genNode node
let addSpaceBeforeParenInPattern (node: IdentListNode) (ctx: Context) =
node.Content
|> List.tryFindBack (function
| IdentifierOrDot.Ident node -> not (String.IsNullOrWhiteSpace node.Text)
| _ -> false)
|> fun identOrDot ->
match identOrDot with
| Some(IdentifierOrDot.Ident node) ->
let parameterValue =
if Char.IsUpper node.Text.[0] then
ctx.Config.SpaceBeforeUppercaseInvocation
else
ctx.Config.SpaceBeforeLowercaseInvocation
onlyIf parameterValue sepSpace ctx
| _ -> sepSpace ctx
let genParsedHashDirective (phd: ParsedHashDirectiveNode) =
let genArg =
function
| Choice1Of2(stn) -> genSingleTextNode stn
| Choice2Of2(idl) -> genIdentListNode idl
!- "#" +> !-phd.Ident +> sepSpace +> col sepSpace phd.Args genArg |> genNode phd
let genUnit (n: UnitNode) =
genSingleTextNode n.OpeningParen +> genSingleTextNode n.ClosingParen
|> genNode n
// genNode will should be called in the caller function.
let genConstant (c: Constant) =
match c with
| Constant.FromText n -> genSingleTextNode n
| Constant.Unit n -> genUnit n
| Constant.Measure n ->
(genConstant n.Constant |> genNode (Constant.Node n.Constant))
+> genSingleTextNode n.Measure.LessThan
+> genMeasure n.Measure.Measure
+> genSingleTextNode n.Measure.GreaterThan
|> genNode n
let genMeasure (measure: Measure) =
match measure with
| Measure.Single n -> genSingleTextNode n
| Measure.Operator n ->
genMeasure n.LeftHandSide
+> sepSpace
+> genSingleTextNode n.Operator
+> sepSpace
+> genMeasure n.RightHandSide
|> genNode n
| Measure.Divide n ->
optSingle genMeasure n.LeftHandSide
+> sepSpace
+> genSingleTextNode n.Operator
+> sepSpace
+> genMeasure n.RightHandSide
|> genNode n
| Measure.Power n ->
genMeasure n.Measure +> genSingleTextNode n.Caret +> genRational n.Exponent
|> genNode n
| Measure.Seq n -> col sepSpace n.Measures genMeasure |> genNode n
| Measure.Multiple n -> genIdentListNode n
| Measure.Paren n ->
genSingleTextNode n.OpeningParen
+> genMeasure n.Measure
+> genSingleTextNode n.ClosingParen
|> genNode n
let genRational (rat: RationalConstNode) =
match rat with
| RationalConstNode.Integer i -> genSingleTextNode i
| RationalConstNode.Negate negate -> genSingleTextNode negate.Minus +> genRational negate.Rational
| RationalConstNode.Rational rationalNode ->
genSingleTextNode rationalNode.OpeningParen
+> genSingleTextNode rationalNode.Numerator
+> genSingleTextNode rationalNode.DivOp
+> genSingleTextNode rationalNode.Denominator
+> genSingleTextNode rationalNode.ClosingParen
|> genNode rationalNode
let genAttributesCore (ats: AttributeNode list) =
let genAttributeExpr (attr: AttributeNode) =
match attr.Expr with
| None -> opt sepColon attr.Target genSingleTextNode +> genIdentListNode attr.TypeName
| Some e ->
let argSpacing = if e.HasParentheses then sepNone else sepSpace
opt sepColon attr.Target genSingleTextNode
+> genIdentListNode attr.TypeName
+> argSpacing
+> genExpr e
|> genNode attr
let shortExpression = atCurrentColumn (col sepSemi ats genAttributeExpr)
let longExpression = atCurrentColumn (col (sepSemi +> sepNln) ats genAttributeExpr)
ifElse ats.IsEmpty sepNone (expressionFitsOnRestOfLine shortExpression longExpression)
let genOnelinerAttributes (n: MultipleAttributeListNode option) =
match n with
| None -> sepNone
| Some n ->
let ats =
List.collect (fun (al: AttributeListNode) -> al.Attributes) n.AttributeLists
let openingToken =
List.tryHead n.AttributeLists
|> Option.map (fun (a: AttributeListNode) -> a.Opening)
let closingToken =
List.tryLast n.AttributeLists
|> Option.map (fun (a: AttributeListNode) -> a.Closing)
let genAttrs =
optSingle genSingleTextNode openingToken
+> genAttributesCore ats
+> optSingle genSingleTextNode closingToken
|> genNode n
ifElse ats.IsEmpty sepNone (genAttrs +> sepSpace)
let genAttributes (node: MultipleAttributeListNode option) =
match node with
| None -> sepNone
| Some node ->
colPost sepNlnUnlessLastEventIsNewline sepNln node.AttributeLists (fun a ->
genSingleTextNode a.Opening
+> (genAttributesCore a.Attributes)
+> genSingleTextNode a.Closing
+> sepNlnWhenWriteBeforeNewlineNotEmpty
|> genNode a)
|> genNode node
// The inherit keyword should already be printed by the caller
let genInheritConstructor (ic: InheritConstructor) =
match ic with
| InheritConstructor.TypeOnly node -> genType node.Type
| InheritConstructor.Unit node ->
genType node.Type
+> sepSpaceBeforeClassConstructor
+> genSingleTextNode node.OpeningParen
+> genSingleTextNode node.ClosingParen
| InheritConstructor.Paren node ->
genType node.Type
+> sepSpaceBeforeClassConstructor
+> expressionFitsOnRestOfLine (genExpr node.Expr) (genMultilineFunctionApplicationArguments node.Expr)
| InheritConstructor.Other node ->
genType node.Type
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genExpr node.Expr)
let mkExprParenNode openingParen e closingParen r =
ExprParenNode(openingParen, e, closingParen, r) |> Expr.Paren
let isIfThenElse (e: Expr) =
match e with
| Expr.IfThen _
| Expr.IfThenElif _
| Expr.IfThenElse _ -> true
| _ -> false
let (|IsIfThenElse|_|) (e: Expr) = if isIfThenElse e then Some e else None
let isLambdaOrIfThenElse (e: Expr) =
match e with
| Expr.Lambda _
| IsIfThenElse _ -> true
| _ -> false
let (|IsLambdaOrIfThenElse|_|) (e: Expr) =
if isLambdaOrIfThenElse e then Some e else None
let genExpr (e: Expr) =
match e with
| Expr.Lazy node ->
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 node.Expr +> sepCloseT)
// if it is multiline there is no need for parenthesis, because of the indentation
(indent +> sepNln +> genExpr node.Expr +> unindent)
ctx
let genNonInfixExpr =
autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr node.Expr)
genSingleTextNode node.LazyWord
+> sepSpaceUnlessWriteBeforeNewlineNotEmpty
+> ifElse node.ExprIsInfix genInfixExpr genNonInfixExpr
|> genNode node
| Expr.Single node ->
genSingleTextNode node.Leading
+> onlyIf node.AddSpace sepSpaceUnlessWriteBeforeNewlineNotEmpty
+> ifElse
node.SupportsStroustrup
(autoIndentAndNlnIfExpressionExceedsPageWidthUnlessStroustrup genExpr node.Expr)
(autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr node.Expr))
|> genNode node
| Expr.Constant node -> genConstant node
| Expr.Null node -> genSingleTextNode node
| Expr.Quote node -> genQuoteExpr node
| Expr.Typed node ->
let short =
let genOperator ctx =
if node.Operator.Length > 1 || ctx.Config.SpaceBeforeColon then
(sepSpace +> !-node.Operator) ctx
else
!- node.Operator ctx
genExpr node.Expr +> genOperator +> sepSpace +> genType node.Type
let long =
genExpr node.Expr +> sepNln +> !-node.Operator +> sepSpace +> genType node.Type
match node.Expr with
| Expr.Lambda _ -> long
| _ -> expressionFitsOnRestOfLine short long
|> genNode node
| Expr.New node ->
match node.Arguments with
| ParenExpr _ ->
let sepSpaceBeforeArgs (ctx: Context) =
match node.Type with
| UppercaseType -> onlyIf ctx.Config.SpaceBeforeUppercaseInvocation sepSpace ctx
| LowercaseType -> onlyIf ctx.Config.SpaceBeforeLowercaseInvocation sepSpace ctx
let short =
genSingleTextNode node.NewKeyword
+> sepSpace
+> genType node.Type
+> sepSpaceBeforeArgs
+> genExpr node.Arguments
let long =
genSingleTextNode node.NewKeyword
+> sepSpace
+> genType node.Type
+> sepSpaceBeforeArgs
+> genMultilineFunctionApplicationArguments node.Arguments
expressionFitsOnRestOfLine short long
| _ ->
genSingleTextNode node.NewKeyword
+> sepSpace
+> genType node.Type
+> sepSpace
+> genExpr node.Arguments
|> genNode node
| Expr.Tuple node -> genTupleExpr node
| Expr.StructTuple node ->
genSingleTextNode node.Struct
+> sepSpace
+> sepOpenT
+> genTupleExpr node.Tuple
+> genSingleTextNode node.ClosingParen
|> genNode node
| Expr.ArrayOrList node -> fun ctx -> genArrayOrList (ctx.Config.MultilineBracketStyle = Cramped) node ctx
| Expr.Record node ->
let smallRecordExpr = genSmallRecordNode node
let multilineRecordExpr = genMultilineRecord node
genRecord smallRecordExpr multilineRecordExpr node
| Expr.AnonStructRecord node ->
let genStructPrefix = genSingleTextNodeWithSpaceSuffix sepSpace node.Struct
let smallRecordExpr = genStructPrefix +> genSmallRecordNode node
let multilineRecordExpr =
if node.Struct.HasContentAfter then
genStructPrefix +> indentSepNlnUnindent (genMultilineRecord node)
else
genStructPrefix +> genMultilineRecord node
genRecord smallRecordExpr multilineRecordExpr node
| Expr.InheritRecord node ->
let genSmallInheritRecordExpr =
genSmallRecordBaseExpr
((genSingleTextNode node.InheritConstructor.InheritKeyword
+> sepSpace
+> genInheritConstructor node.InheritConstructor
|> genNode (InheritConstructor.Node node.InheritConstructor))
+> onlyIf node.HasFields sepSemi)
node
let genMultilineInheritRecordExpr =
let fieldsExpr genRecordField =
genMultilineRecordFieldsExpr genRecordField node
let genInheritInfo =
(genSingleTextNode node.InheritConstructor.InheritKeyword
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidth (genInheritConstructor node.InheritConstructor)
|> genNode (InheritConstructor.Node node.InheritConstructor))
+> onlyIf node.HasFields sepNln
let genMultilineAlignBrackets =
genSingleTextNode node.OpeningBrace
+> indentSepNlnUnindent (genInheritInfo +> fieldsExpr genRecordFieldNameAligned)
+> sepNln
+> genSingleTextNode node.ClosingBrace
let genMultilineCramped (ctx: Context) =
// This is the column each field should start on.
let targetColumn =
let openBraceLength = node.OpeningBrace.Text.Length
ctx.Column
+ (if ctx.Config.SpaceAroundDelimiter then
openBraceLength + 1
else
openBraceLength)
(genSingleTextNodeSuffixDelimiter node.OpeningBrace
+> atCurrentColumn genInheritInfo
+> col sepNln node.Fields (fun e ->
// Add spaces to ensure the record field (incl trivia) starts at the right column.
addFixedSpaces targetColumn
// Potential indentations will be in relation to the opening curly brace.
+> genRecordFieldNameCramped false e)
+> addSpaceIfSpaceAroundDelimiter
+> genSingleTextNode node.ClosingBrace)
ctx
ifAlignOrStroustrupBrackets genMultilineAlignBrackets genMultilineCramped
genRecord genSmallInheritRecordExpr genMultilineInheritRecordExpr node
| Expr.ObjExpr node ->
let param = optSingle genExpr node.Expr
if node.Bindings.IsEmpty && node.Members.IsEmpty && node.Interfaces.IsEmpty then
// See https://devblogs.microsoft.com/dotnet/announcing-f-5/#default-interface-member-consumption
genSingleTextNode node.OpeningBrace
+> addSpaceIfSpaceAroundDelimiter
+> genSingleTextNode node.New
+> sepSpace
+> genType node.Type
+> param
+> addSpaceIfSpaceAroundDelimiter
+> genSingleTextNode node.ClosingBrace
else
let genInterfaceImpl (node: InterfaceImplNode) =
if node.Bindings.IsEmpty && node.Members.IsEmpty then
genSingleTextNode node.Interface +> sepSpace +> genType node.Type
else
genSingleTextNode node.Interface
+> sepSpace
+> genType node.Type
+> sepSpace
+> optSingle genSingleTextNode node.With
+> indentSepNlnUnindent (genBindings false node.Bindings +> genMemberDefnList node.Members)
|> genNode node
let genBody =
let sepNlnBeforeInterfaces =
match node.Interfaces with
| [] -> sepNone
| h :: _ -> sepNlnUnlessContentBefore h
indentSepNlnUnindent (genBindings false node.Bindings +> genMemberDefnList node.Members)
+> sepNlnBeforeInterfaces
+> colEx sepNlnUnlessContentBefore node.Interfaces genInterfaceImpl
let genObjExpr =
genSingleTextNode node.OpeningBrace
+> addSpaceIfSpaceAroundDelimiter
+> atCurrentColumn (
genSingleTextNode node.New
+> sepSpace
+> genType node.Type
+> param
+> sepSpace
+> optSingle genSingleTextNode node.With
+> genBody
)
+> addSpaceIfSpaceAroundDelimiter
+> genSingleTextNode node.ClosingBrace
let genObjExprAlignBrackets =
let genObjExpr =
atCurrentColumn (
genSingleTextNode node.New
+> sepSpace
+> genType node.Type
+> param
+> sepSpace
+> optSingle genSingleTextNode node.With
+> genBody
)
atCurrentColumnIndent (
genSingleTextNode node.OpeningBrace
+> addSpaceIfSpaceAroundDelimiter
+> genObjExpr
+> sepNln
+> genSingleTextNode node.ClosingBrace
)
ifAlignOrStroustrupBrackets genObjExprAlignBrackets genObjExpr
|> genNode node
| Expr.While node ->
atCurrentColumn (
genSingleTextNode node.While
+> sepSpace
+> genExpr node.WhileExpr
+> !- " do"
+> indentSepNlnUnindent (genExpr node.DoExpr)
)
|> genNode node
| Expr.For node ->
atCurrentColumn (
genSingleTextNode node.For
+> sepSpace
+> genSingleTextNode node.Ident
+> sepSpace
+> genSingleTextNode node.Equals
+> sepSpace
+> genExpr node.IdentBody
+> ifElse node.Direction (!- " to ") (!- " downto ")
+> genExpr node.ToBody
+> !- " do"
+> indent
+> sepNln
+> genExpr node.DoBody
+> unindent
)
|> genNode node
| Expr.ForEach node ->
atCurrentColumn (
genSingleTextNode node.For
+> sepSpace
+> genPat node.Pattern
+> !- " in "
+> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr node.EnumExpr)
+> ifElse
node.IsArrow
(sepArrow +> autoIndentAndNlnIfExpressionExceedsPageWidth (genExpr node.BodyExpr))
(!- " do" +> indent +> sepNln +> genExpr node.BodyExpr +> unindent)
)
|> genNode node
| Expr.NamedComputation node ->
let short =
genExpr node.Name
+> sepSpace
+> genSingleTextNode node.OpeningBrace
+> addSpaceIfSpaceAroundDelimiter
+> genExpr node.Body
+> addSpaceIfSpaceAroundDelimiter
+> genSingleTextNode node.ClosingBrace
let long =
genExpr node.Name
+> sepSpace
+> genSingleTextNode node.OpeningBrace
+> indentSepNlnUnindent (genExpr node.Body)
+> sepNln
+> genSingleTextNode node.ClosingBrace
expressionFitsOnRestOfLine short long |> genNode node
| Expr.Computation node ->
genSingleTextNode node.OpeningBrace
+> addSpaceIfSpaceAroundDelimiter
+> genExpr node.Body
+> addSpaceIfSpaceAroundDelimiter
+> genSingleTextNode node.ClosingBrace
|> genNode node
| Expr.CompExprBody node ->
let genStatements =
node.Statements
|> List.map (function
| ComputationExpressionStatement.LetOrUseStatement node ->
let expr =
genBinding node.Binding
+> optSingle (fun inNode -> sepSpace +> genSingleTextNode inNode) node.In
|> genNode node
ColMultilineItem(expr, sepNlnUnlessContentBefore node)
| ComputationExpressionStatement.LetOrUseBangStatement node ->
let expr =
genSingleTextNode node.LeadingKeyword
+> sepSpace
+> genPat node.Pattern
+> sepSpace
+> genSingleTextNode node.Equals
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidthUnlessStroustrup genExpr node.Expression
|> genNode node
ColMultilineItem(expr, sepNlnUnlessContentBefore node)
| ComputationExpressionStatement.AndBangStatement node ->
let expr =
genSingleTextNode node.LeadingKeyword
+> sepSpace
+> genPat node.Pattern
+> sepSpace
+> genSingleTextNode node.Equals
+> sepSpaceOrIndentAndNlnIfExpressionExceedsPageWidthUnlessStroustrup genExpr node.Expression
|> genNode node
ColMultilineItem(expr, sepNlnUnlessContentBefore node)
| ComputationExpressionStatement.OtherStatement e ->
ColMultilineItem(genExpr e, sepNlnUnlessContentBefore (Expr.Node e)))
|> colWithNlnWhenItemIsMultilineUsingConfig
|> genNode node
match node.Statements with
| [ ComputationExpressionStatement.LetOrUseStatement letOrUseNode
ComputationExpressionStatement.OtherStatement inExpr ] when letOrUseNode.In.IsSome ->
let short =
(genBinding letOrUseNode.Binding
+> optSingle (fun inNode -> sepSpace +> genSingleTextNode inNode +> sepSpace) letOrUseNode.In
|> genNode letOrUseNode)
+> sepSpace
+> genExpr inExpr
|> genNode node
expressionFitsOnRestOfLine short genStatements
| _ -> genStatements
| Expr.JoinIn node ->
genExpr node.LeftHandSide
+> sepSpace
+> genSingleTextNode node.In
+> sepSpace
+> atCurrentColumn (genExpr node.RightHandSide)
|> genNode node
| Expr.ParenLambda node ->
genSingleTextNode node.OpeningParen
+> leadingExpressionIsMultiline
(genLambdaWithParen node.Lambda +> sepNlnWhenWriteBeforeNewlineNotEmpty)
(fun isMultiline ctx ->
onlyIf
(isMultiline
&& ctx.Config.MultiLineLambdaClosingNewline
&& not (isStroustrupStyleExpr ctx.Config node.Lambda.Expr))
sepNln
ctx)
+> genSingleTextNode node.ClosingParen
|> genNode node
| Expr.Lambda node -> genLambda node
| Expr.MatchLambda node ->
genSingleTextNode node.Function +> sepNln +> genClauses node.Clauses
|> genNode node
| Expr.Match node ->
atCurrentColumn (
genControlExpressionStartCore (Choice1Of2 node.Match) node.MatchExpr node.With
+> sepNln
+> genClauses node.Clauses
)
|> genNode node
| Expr.TraitCall node ->
genType node.Type
+> sepColon
+> sepOpenT
+> genMemberDefn node.MemberDefn
+> sepCloseT
+> sepSpace
+> genExpr node.Expr
|> genNode node
| Expr.ParenILEmbedded node -> genSingleTextNode node
| Expr.ParenFunctionNameWithStar node ->
genSingleTextNode node.OpeningParen
+> sepSpace
+> genSingleTextNode node.FunctionName
+> sepSpace
+> genSingleTextNode node.ClosingParen
|> genNode node
| Expr.Paren node ->
match node.Expr with
| Expr.CompExprBody _ ->
genSingleTextNode node.OpeningParen
+> atCurrentColumn (genExpr node.Expr)
+> genSingleTextNode node.ClosingParen
| _ ->
genSingleTextNode node.OpeningParen
+> sepNlnWhenWriteBeforeNewlineNotEmpty
+> genExpr node.Expr
+> genSingleTextNode node.ClosingParen
|> genNode node
| Expr.Dynamic node -> genExpr node.FuncExpr +> !- "?" +> genExpr node.ArgExpr |> genNode node
| Expr.PrefixApp node ->
let fallback = genSingleTextNode node.Operator +> genExpr node.Expr
match node.Expr with
| Expr.Constant _
| Expr.InterpolatedStringExpr _ when not (String.startsWithOrdinal "%" node.Operator.Text) ->
genSingleTextNode node.Operator +> sepSpace +> genExpr node.Expr
| Expr.AppSingleParenArg appNode ->
genSingleTextNode node.Operator
+> sepSpace
+> genExpr appNode.FunctionExpr
+> genExpr appNode.ArgExpr
| Expr.AppLongIdentAndSingleParenArg appNode ->
let mOptVarNode = appNode.FunctionName.Range
genSingleTextNode node.Operator
+> sepSpace
+> genExpr (Expr.OptVar(ExprOptVarNode(false, appNode.FunctionName, mOptVarNode)))
+> genExpr appNode.ArgExpr
| Expr.App appNode ->
match appNode.Arguments with
| [ Expr.Constant(Constant.Unit _) as argExpr ] ->
genSingleTextNode node.Operator
+> sepSpace
+> genExpr appNode.FunctionExpr
+> genExpr argExpr
| _ -> fallback
| _ -> fallback
|> genNode node
| Expr.SameInfixApps node ->
let headIsSynExprLambdaOrIfThenElse = isLambdaOrIfThenElse node.LeadingExpr
let shortExpr =
onlyIf headIsSynExprLambdaOrIfThenElse sepOpenT
+> genExpr node.LeadingExpr
+> onlyIf headIsSynExprLambdaOrIfThenElse sepCloseT
+> sepSpace
+> col sepSpace node.SubsequentExpressions (fun (operator, rhs) ->
genSingleTextNode operator
+> sepSpace
+> onlyIf (isLambdaOrIfThenElse rhs) sepOpenT
+> genExpr rhs
+> onlyIf (isLambdaOrIfThenElse rhs) sepCloseT)
let multilineExpr =
match node.SubsequentExpressions with
| [] -> genExpr node.LeadingExpr
| (operator, e2) :: es ->
let m =
Fantomas.FCS.Text.Range.unionRanges (Expr.Node node.LeadingExpr).Range (Expr.Node e2).Range
genMultilineInfixExpr (ExprInfixAppNode(node.LeadingExpr, operator, e2, m))
+> sepNln
+> col sepNln es (fun (operator, e) ->
genSingleTextNode operator
+> sepNlnWhenWriteBeforeNewlineNotEmptyOr sepSpace
+> (fun ctx ->
match e with
| Expr.Lambda _ when
newLineInfixOps.Contains operator.Text
&& ctx.Config.IndentSize <= operator.Text.Length
->
// Special measure to account for https://github.com/fsprojects/fantomas/issues/870
(indent +> genExprInMultilineInfixExpr e +> unindent) ctx
| _ -> genExprInMultilineInfixExpr e ctx))
fun ctx ->
genNode
node
(atCurrentColumn (isShortExpression ctx.Config.MaxInfixOperatorExpression shortExpr multilineExpr))
ctx
| Expr.InfixApp node ->
let genOnelinerInfixExpr (node: ExprInfixAppNode) =
let genExpr e =
match e with
| Expr.Record _
| Expr.AnonStructRecord _ -> atCurrentColumnIndent (genExpr e)
| _ -> genExpr e
genExpr node.LeftHandSide
+> sepSpace
+> genSingleTextNode node.Operator
+> sepNlnWhenWriteBeforeNewlineNotEmpty
+> sepSpace
+> genExpr node.RightHandSide
if
isLambdaOrIfThenElse node.LeftHandSide
&& newLineInfixOps.Contains node.Operator.Text
then
genNode node (genMultilineInfixExpr node)
else
fun ctx ->
genNode
node
(isShortExpression
ctx.Config.MaxInfixOperatorExpression
(genOnelinerInfixExpr node)
(ifElse
(noBreakInfixOps.Contains(node.Operator.Text))
(genOnelinerInfixExpr node)
(genMultilineInfixExpr node)))
ctx
| Expr.IndexWithoutDot node ->
let genIdentifierExpr =
match node.Identifier with
| Expr.AppLongIdentAndSingleParenArg appNode -> genAppLongIdentAndSingleParenArgExpr sepNone appNode
| Expr.AppSingleParenArg appNode -> genAppSingleParenArgExpr sepNone appNode
| _ -> genExpr node.Identifier
let genIndexExpr = genExpr node.Index
genIdentifierExpr
+> sepOpenLFixed
+> expressionFitsOnRestOfLine genIndexExpr (atCurrentColumnIndent genIndexExpr)
+> sepCloseLFixed
|> genNode node
| Expr.Chain node ->
let genLink (isLastLink: bool) (link: ChainLink) =
match link with
| ChainLink.Identifier expr -> genExpr expr
| ChainLink.Dot stn -> genSingleTextNode stn
| ChainLink.Expr expr ->
match expr with
| Expr.App appNode ->
match appNode.Arguments with
| [ Expr.ArrayOrList _ as arrayOrList ] ->
// Edge case for something like .G[].
genExpr appNode.FunctionExpr +> genExpr arrayOrList
| _ -> genExpr expr
| _ -> genExpr expr
| ChainLink.AppUnit appUnitNode ->
genExpr appUnitNode.FunctionName
+> onlyIf
isLastLink
(sepSpaceBeforeParenInFuncInvocation
appUnitNode.FunctionName
(Expr.Constant(Constant.Unit appUnitNode.Unit)))
+> genUnit appUnitNode.Unit
|> genNode appUnitNode
| ChainLink.AppParen appParen ->
let short =
genExpr appParen.FunctionName
+> onlyIf
isLastLink
(sepSpaceBeforeParenInFuncInvocation appParen.FunctionName (Expr.Paren appParen.Paren))
+> genExpr (Expr.Paren appParen.Paren)
let long =
match appParen.Paren.Expr with
| Expr.Lambda lambdaNode ->
genExpr appParen.FunctionName
+> onlyIf
isLastLink
(sepSpaceBeforeParenInFuncInvocation appParen.FunctionName (Expr.Paren appParen.Paren))
+> genSingleTextNode appParen.Paren.OpeningParen
+> genLambdaWithParen lambdaNode
+> onlyIfCtx
(fun ctx ->
ctx.Config.MultiLineLambdaClosingNewline
&& (not (isStroustrupStyleExpr ctx.Config lambdaNode.Expr)))
sepNln
+> genSingleTextNode appParen.Paren.ClosingParen
| _ ->
genExpr appParen.FunctionName
+> onlyIf
isLastLink
(sepSpaceBeforeParenInFuncInvocation appParen.FunctionName (Expr.Paren appParen.Paren))
+> genMultilineFunctionApplicationArguments (Expr.Paren appParen.Paren)
expressionFitsOnRestOfLine short long |> genNode appParen
| ChainLink.IndexExpr e -> sepOpenLFixed +> genExpr e +> sepCloseLFixed
let lastIndex = node.Links.Length - 1
let short = coli sepNone node.Links (fun idx -> genLink (idx = lastIndex))
let long =
let (|SimpleChain|_|) (link: ChainLink) =
match link with
| ChainLink.Identifier _
| ChainLink.IndexExpr _ -> Some link
| _ -> None
let (|LeadingSimpleChain|_|) (links: ChainLink list) =
let leading = System.Collections.Generic.Queue(links.Length)
let rest = System.Collections.Generic.Queue(links.Length)
(None, links)
||> List.fold (fun lastDot link ->
if not (Seq.isEmpty rest) then
rest.Enqueue link
None
else
match link with
| SimpleChain _ ->
Option.iter leading.Enqueue lastDot
leading.Enqueue link
None
| ChainLink.Dot _ as dot -> Some dot
| _ ->
Option.iter rest.Enqueue lastDot
rest.Enqueue link
None)
|> (fun _ ->
if Seq.isEmpty leading then
None
else
Some(Seq.toList leading, Seq.toList rest))
let rec genIndentedLinks (lastLinkWasSimple: bool) (links: ChainLink list) (ctx: Context) : Context =
match links with
| [] -> ctx
| ChainLink.Dot dot :: link :: rest ->
let isLast = List.isEmpty rest
let genDotAndLink = genSingleTextNode dot +> genLink isLast link
let currentIsSimple = ((|SimpleChain|_|) >> Option.isSome) link
let currentLinkFitsOnRestOfLine = not (futureNlnCheck genDotAndLink ctx)
if lastLinkWasSimple && currentLinkFitsOnRestOfLine then
// The last link was an identifier and the current link fits on the remainder of the current line.
genIndentedLinks currentIsSimple rest (genDotAndLink ctx)
else
let ctx' =
onlyIf
(not // Last link was `.Foo()`
lastLinkWasSimple
// `.Foo.Bar` but `Bar` crossed the max_line_length
|| (lastLinkWasSimple && currentIsSimple && not currentLinkFitsOnRestOfLine))
sepNlnUnlessLastEventIsNewline
ctx
genIndentedLinks
currentIsSimple
rest
// Print the current link
(genDotAndLink ctx')
| _ -> failwith "Expected dot in chain at this point"
let genFirstLinkAndIndentOther (firstLink: ChainLink) (others: ChainLink list) =
genLink false firstLink +> indentSepNlnUnindent (genIndentedLinks false others)
match node.Links with
| [] -> sepNone