XML character dereferencer

Magnus — Fri, 13 Aug 2010 14:30:38 +0000

Just in case you ever need one:

xmlCharDeref :: String -> String
xmlCharDeref [] = []
xmlCharDeref ('&':'#':'x':r) = let
        (digits, remainder) = span (/= ';') r
        c = chr (read ("0x" ++ digits))
    in
        c : xmlCharDeref (tail remainder)
xmlCharDeref ('&':'#':r) = let
        (digits, remainder) = span (/= ';') r
        c = chr (read digits)
    in
        c : xmlCharDeref (tail remainder)
xmlCharDeref (c:r) = c : xmlCharDeref r

In ghci:

*Foo> xmlCharDeref "hello there"
"hello there"
*Foo> xmlCharDeref "hello there"
"hello there"
*Foo> xmlCharDeref "hello2there"
"hello2there"

Share/Bookmark

XML prettifier in Haskell

Magnus — Tue, 14 Jul 2009 13:44:37 +0000

I don’t know how many times I’ve gone looking for one of these but my search-fu is weak and I always give up, instead resorting to manual editing in Vim (no I hardly ever need the entire file to be pretty, only one or two tags that I’m interested in). Anyway, here’s a quick hack in Haskell, relying on xml for the heavy lifting:

#! /usr/bin/env runhaskell
 
module Main where
 
import Control.Monad
import System.Environment
import Text.XML.Light.Input
import Text.XML.Light.Output
 
main = do
    fn <- liftM (!! 0) $ getArgs
    xml_contents <- readFile fn
    let (Just doc) = parseXMLDoc xml_contents
    writeFile ("pretty-" ++ fn) (ppTopElement doc)

Share/Bookmark

therning.org/ magnus » xml

XML character dereferencer

XML prettifier in Haskell