Language.Haskell.Exts.Pretty

Pretty printer for Haskell with extensions.

Pretty printing

class Pretty a

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

Instances

Pretty GuardedAlt

Pretty GuardedAlts

Pretty Alt

Pretty FieldUpdate

Pretty Stmt

Pretty PatField

Pretty RPat

Pretty RPatOp

Pretty PXAttr

Pretty Pat

Pretty RuleVar

Pretty Rule

Pretty Activation

Pretty Tool

Pretty OptionPragma

Pretty CallConv

Pretty Safety

Pretty Splice

Pretty Bracket

Pretty XAttr

Pretty XName

Pretty Exp

Pretty Literal

Pretty Asst

Pretty FunDep

Pretty Kind

Pretty TyVarBind

Pretty Type

Pretty GuardedRhs

Pretty Rhs

Pretty BangType

Pretty InstDecl

Pretty ClassDecl

Pretty ConDecl

Pretty GadtDecl

Pretty QualConDecl

Pretty Match

Pretty IPBind

Pretty DataOrNew

Pretty Decl

Pretty Assoc

Pretty ImportSpec

Pretty ImportDecl

Pretty ExportSpec

Pretty Module

Pretty CName

Pretty Op

Pretty QOp

Pretty IPName

Pretty Name

Pretty QName

Pretty ModuleName

Pretty SrcLoc

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

Fields

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

Fields

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?

comments :: Bool

not implemented yet

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

Instances

Eq PPLayout

defaultMode :: PPHsMode

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