Prettyprinter.Internal.Debug

Warning: internal module! This means that the API may change arbitrarily between versions without notice. Depending on this module may lead to unexpected breakages, so proceed with caution!

This module provides debugging helpers for inspecting Docs.

Use the pretty-simple package to get a nicer layout for shown Diags:

> Text.Pretty.Simple.pPrintNoColor . diag $ align (vcat ["foo", "bar"])
Column
   [
       ( 10
       , Nesting
           [
               ( 10
               , Cat ( Text 3 "foo" )
                   ( Cat ( FlatAlt Line Empty ) ( Text 3 "bar" ) )
               )
           ]
       )
   ]

Documentation

data Diag ann

A variant of Doc for debugging.

Unlike in the Doc type, the Column, WithPageWidth and Nesting constructors don't contain functions but are "sampled" to allow simple inspection with show.

Constructors

Fail

Empty

Char !Char

Text !Int !Text

Line

FlatAlt (Diag ann) (Diag ann)

Cat (Diag ann) (Diag ann)

Nest !Int (Diag ann)

Union (Diag ann) (Diag ann)

Column [(Int, Diag ann)]

Doc: (Int -> Diag ann)

WithPageWidth [(PageWidth, Diag ann)]

Doc: (PageWidth -> Diag ann)

Nesting [(Int, Diag ann)]

Doc: (Int -> Diag ann)

Annotated ann (Diag ann)

Instances

Show ann => Show (Diag ann)

Defined in Prettyprinter.Internal.Debug

Methods

showsPrec :: Int -> Diag ann -> ShowS

show :: Diag ann -> String

showList :: [Diag ann] -> ShowS

diag :: Doc ann -> Diag ann

Convert a Doc to its diagnostic representation.

The functions in the Column, WithPageWidth and Nesting constructors are sampled with some default values.

Use diag' to control the function inputs yourself.

>>> diag $ Doc.align (Doc.vcat ["foo", "bar"])
Column [(10,Nesting [(10,Cat (Text 3 "foo") (Cat (FlatAlt Line Empty) (Text 3 "bar")))])]

diag'

Arguments

:: [Int]

Cursor positions for the Column constructor

-> [PageWidth]

For WithPageWidth

-> [Int]

Nesting levels for Nesting

-> Doc ann

-> Diag ann