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| Text.PrettyPrint.HughesPJ | | Portability | portable | | Stability | provisional | | Maintainer | libraries@haskell.org |
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| Contents |
- The document type
- Primitive Documents
- Converting values into documents
- Wrapping documents in delimiters
- Combining documents
- Predicates on documents
- Rendering documents
- Default rendering
- Rendering with a particular style
- General rendering
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| Description |
John Hughes's and Simon Peyton Jones's Pretty Printer Combinators Based on The Design of a Pretty-printing Library
in Advanced Functional Programming,
Johan Jeuring and Erik Meijer (eds), LNCS 925
http://www.cs.chalmers.se/~rjmh/Papers/pretty.ps Heavily modified by Simon Peyton Jones, Dec 96
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| Synopsis |
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| The document type |
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| data Doc |
| The abstract type of documents | | Instances | |
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| Primitive Documents |
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| empty :: Doc |
| An empty document |
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| semi :: Doc |
| A ';' character |
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| comma :: Doc |
| A ',' character |
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| colon :: Doc |
| A ':' character |
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| space :: Doc |
| A space character |
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| equals :: Doc |
| A '=' character |
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| lparen :: Doc |
| A '(' character |
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| rparen :: Doc |
| A ')' character |
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| lbrack :: Doc |
| A '[' character |
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| rbrack :: Doc |
| A ']' character |
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| lbrace :: Doc |
| A '{' character |
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| rbrace :: Doc |
| A '}' character |
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| Converting values into documents |
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| text :: String -> Doc |
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| char :: Char -> Doc |
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| ptext :: String -> Doc |
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| int :: Int -> Doc |
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| integer :: Integer -> Doc |
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| float :: Float -> Doc |
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| double :: Double -> Doc |
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| rational :: Rational -> Doc |
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| Wrapping documents in delimiters |
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| parens :: Doc -> Doc |
| Wrap document in (...) |
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| brackets :: Doc -> Doc |
| Wrap document in [...] |
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| braces :: Doc -> Doc |
| Wrap document in {...} |
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| quotes :: Doc -> Doc |
| Wrap document in ... |
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| doubleQuotes :: Doc -> Doc |
| Wrap document in "..." |
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| Combining documents |
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| (<>) :: Doc -> Doc -> Doc |
| Beside |
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| (<+>) :: Doc -> Doc -> Doc |
| Beside, separated by space |
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| hcat :: [Doc] -> Doc |
| List version of \<> |
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| hsep :: [Doc] -> Doc |
| List version of \<+> |
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| ($$) :: Doc -> Doc -> Doc |
| Above; if there is no
overlap it "dovetails" the two |
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| vcat :: [Doc] -> Doc |
| List version of $$ |
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| sep :: [Doc] -> Doc |
| Either hsep or vcat |
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| cat :: [Doc] -> Doc |
| Either hcat or vcat |
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| fsep :: [Doc] -> Doc |
| "Paragraph fill" version of sep |
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| fcat :: [Doc] -> Doc |
| "Paragraph fill" version of cat |
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| nest :: Int -> Doc -> Doc |
| Nested |
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| hang :: Doc -> Int -> Doc -> Doc |
| hang d1 n d2 = sep [d1, nest n d2] |
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| punctuate :: Doc -> [Doc] -> [Doc] |
| punctuate p [d1, ... dn] = [d1 <> p, d2 <> p, ... dn-1 <> p, dn] |
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| Predicates on documents |
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| isEmpty :: Doc -> Bool |
| Returns True if the document is empty |
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| Rendering documents |
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| Default rendering |
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| render :: Doc -> String |
| Renders the document as a string using the default style |
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| Rendering with a particular style |
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| 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 |
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| style :: Style |
| The default style (mode=PageMode, lineLength=100, ribbonsPerLine=1.5) |
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| renderStyle :: Style -> Doc -> String |
| Render the document as a string using a specified style |
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| General rendering |
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| fullRender |
| :: Mode | Rendering mode | | -> Int | Line length | | -> Float | Ribbons per line | | -> (TextDetails -> a -> a) | What to do with text | | -> a | What to do at the end | | -> Doc | The document | | -> a | Result | | The general rendering interface |
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| data Mode |
| Rendering mode | | Constructors | | PageMode | Normal | | ZigZagMode | With zig-zag cuts | | LeftMode | No indentation, infinitely long lines | | OneLineMode | All on one line |
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| data TextDetails |
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| Produced by Haddock version 0.3 |
