Language.Haskell.Exts.Pretty

haskell-src-exts-1.3.5: Manipulating Haskell source: abstract syntax, lexer, parser, and pretty-printer

Language.Haskell.Exts.Pretty

Portability	portable
Stability	stable
Maintainer	Niklas Broberg, d00nibro@chalmers.se

Contents

Pretty printing
Pretty-printing styles (from Text.PrettyPrint.HughesPJ)
Haskell formatting modes

Description

Pretty printer for Haskell with extensions.

Synopsis

class Pretty a

prettyPrintStyleMode :: Pretty a => Style -> PPHsMode -> a -> String

prettyPrintWithMode :: Pretty a => PPHsMode -> a -> String

prettyPrint :: Pretty a => a -> String

data Style = Style {

lineLength :: Int

ribbonsPerLine :: Float

}

data Mode

data PPHsMode = PPHsMode {

classIndent :: Indent

doIndent :: Indent

caseIndent :: Indent

letIndent :: Indent

whereIndent :: Indent

onsideIndent :: Indent

spacing :: Bool

layout :: PPLayout

linePragmas :: Bool

}

type Indent = Int

data PPLayout

= PPOffsideRule

defaultMode :: PPHsMode

Pretty printing

class Pretty a

Things that can be pretty-printed, including all the syntactic objects in Language.Haskell.Exts.Syntax.

show/hide

Instances

Pretty GuardedAlt

Pretty GuardedAlts

Pretty FieldUpdate

Pretty QualStmt

Pretty PatField

Pretty Activation

Pretty OptionPragma

Pretty CallConv

Pretty TyVarBind

Pretty GuardedRhs

Pretty BangType

Pretty InstDecl

Pretty ClassDecl

Pretty GadtDecl

Pretty QualConDecl

Pretty DataOrNew

Pretty ImportSpec

Pretty ImportDecl

Pretty ExportSpec

Pretty SpecialCon

Pretty ModuleName

SrcInfo loc => Pretty (GuardedAlt loc)

SrcInfo loc => Pretty (GuardedAlts loc)

SrcInfo loc => Pretty (Alt loc)

SrcInfo loc => Pretty (FieldUpdate loc)

SrcInfo loc => Pretty (QualStmt loc)

SrcInfo loc => Pretty (Stmt loc)

SrcInfo loc => Pretty (PatField loc)

SrcInfo loc => Pretty (RPat loc)

Pretty (RPatOp l)

SrcInfo loc => Pretty (PXAttr loc)

SrcInfo loc => Pretty (Pat loc)

Pretty (WarningText l)

Pretty (RuleVar l)

SrcInfo loc => Pretty (Rule loc)

Pretty (Activation l)

Pretty (OptionPragma l)

Pretty (CallConv l)

Pretty (Safety l)

SrcInfo loc => Pretty (Splice loc)

SrcInfo loc => Pretty (Bracket loc)

SrcInfo loc => Pretty (XAttr loc)

Pretty (XName l)

SrcInfo loc => Pretty (Exp loc)

Pretty (Literal l)

Pretty (Asst l)

Pretty (Context l)

Pretty (FunDep l)

Pretty (Kind l)

Pretty (TyVarBind l)

Pretty (Type l)

SrcInfo loc => Pretty (GuardedRhs loc)

SrcInfo loc => Pretty (Rhs loc)

Pretty (BangType l)

SrcInfo loc => Pretty (InstDecl loc)

SrcInfo loc => Pretty (ClassDecl loc)

Pretty (GadtDecl l)

Pretty (FieldDecl l)

Pretty (ConDecl l)

Pretty (QualConDecl l)

SrcInfo pos => Pretty (Match pos)

SrcInfo loc => Pretty (IPBind loc)

Pretty (Deriving l)

Pretty (InstHead l)

Pretty (DeclHead l)

Pretty (DataOrNew l)

SrcInfo pos => Pretty (Decl pos)

Pretty (Assoc l)

Pretty (ImportSpec l)

Pretty (ImportSpecList l)

SrcInfo pos => Pretty (ImportDecl pos)

Pretty (ExportSpec l)

Pretty (ExportSpecList l)

Pretty (ModuleHead l)

SrcInfo pos => Pretty (Module pos)

Pretty (CName l)

Pretty (IPName l)

Pretty (Name l)

Pretty (QName l)

Pretty (ModuleName l)

SrcInfo loc => Pretty (PAsst loc)

SrcInfo loc => Pretty (PType loc)

SrcInfo loc => Pretty (PContext loc)

SrcInfo loc => Pretty (ParseXAttr loc)

SrcInfo loc => Pretty (PFieldUpdate loc)

SrcInfo loc => Pretty (PExp loc)

prettyPrintStyleMode :: Pretty a => Style -> PPHsMode -> a -> String

pretty-print with a given style and mode.

prettyPrintWithMode :: Pretty a => PPHsMode -> a -> String

pretty-print with the default style and a given mode.

prettyPrint :: Pretty a => a -> String

pretty-print with the default style and defaultMode.

Pretty-printing styles (from Text.PrettyPrint.HughesPJ)

data Style

A rendering style.

Constructors

Style

mode :: Mode	The rendering mode
lineLength :: Int	Length of line, in chars
ribbonsPerLine :: Float	Ratio of ribbon length to line length

style :: Style

The default style (mode=PageMode, lineLength=100, ribbonsPerLine=1.5).

data Mode

Rendering mode.

Constructors

PageMode	Normal
ZigZagMode	With zig-zag cuts
LeftMode	No indentation, infinitely long lines
OneLineMode	All on one line

Haskell formatting modes

data PPHsMode

Pretty-printing parameters.

Note: the onsideIndent must be positive and less than all other indents.

Constructors

PPHsMode

classIndent :: Indent	indentation of a class or instance
doIndent :: Indent	indentation of a `do`-expression
caseIndent :: Indent	indentation of the body of a `case` expression
letIndent :: Indent	indentation of the declarations in a `let` expression
whereIndent :: Indent	indentation of the declarations in a `where` clause
onsideIndent :: Indent	indentation added for continuation lines that would otherwise be offside
spacing :: Bool	blank lines between statements?
layout :: PPLayout	Pretty-printing style to use
linePragmas :: Bool	add GHC-style `LINE` pragmas to output?

type Indent = Int

data PPLayout

Varieties of layout we can use.

Constructors

PPOffsideRule	classical layout
PPSemiColon	classical layout made explicit
PPInLine	inline decls, with newlines between them
PPNoLayout	everything on a single line

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Instances

defaultMode :: PPHsMode

The default mode: pretty-print using the offside rule and sensible defaults.

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