From f5fb4f27b4e9cecdc3afc2facc8e39717ea20524 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Tue, 26 Apr 2016 08:56:21 -0400
Subject: Initial commit

This is just dataenc-0.14.0.7 from hackage with the upper bound on
'base' changed in dataenc.cabal.

I couldn't find a git repo to fork, so I used 'stack unpack'
---
 src/Codec/Binary/PythonString.hs | 109 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 src/Codec/Binary/PythonString.hs

(limited to 'src/Codec/Binary/PythonString.hs')

diff --git a/src/Codec/Binary/PythonString.hs b/src/Codec/Binary/PythonString.hs
new file mode 100644
index 0000000..eae4c51
--- /dev/null
+++ b/src/Codec/Binary/PythonString.hs
@@ -0,0 +1,109 @@
+-- |
+-- Module    : Codec.Binary.PythonString
+-- Copyright : (c) 2009 Magnus Therning
+-- License   : BSD3
+--
+-- Implementation of python escaping.
+--
+-- This implementation encodes non-printable characters (0x00-0x1f, 0x7f-0xff)
+-- to hex-value characters ('\xhh') while leaving printable characters as such:
+--
+-- @
+-- \> encode [0, 10, 13, 110]
+-- \"\\\\x00\\\\x0A\\\\x0Dn\"
+-- \> putStrLn $ encode [0, 10, 13, 110]
+-- \\x00\\x0A\\x0Dn
+-- @
+--
+-- It also properly handles escaping of a few characters that require it:
+--
+-- @
+-- \> encode [34, 39, 92]
+-- \"\\\\\\\"\\\\\'\\\\\\\\\"
+-- putStrLn $ encode [34, 39, 92]
+-- \\\"\\'\\\\
+-- @
+--
+-- Further documentation and information can be found at
+-- <http://www.haskell.org/haskellwiki/Library/Data_encoding>.
+module Codec.Binary.PythonString
+    ( EncIncData(..)
+    , EncIncRes(..)
+    , encodeInc
+    , encode
+    , DecIncData(..)
+    , DecIncRes(..)
+    , decodeInc
+    , decode
+    , chop
+    , unchop
+    ) where
+
+import Codec.Binary.Util
+
+import Data.Char
+import Data.Maybe
+import Data.Word
+
+-- {{{1 encode
+-- | Incremental encoder function.
+encodeInc :: EncIncData -> EncIncRes String
+encodeInc e = eI e
+    where
+        enc [] = []
+        enc (o:os)
+            | o < 0x20 || o > 0x7e = ('\\' : 'x' : toHex o) ++ enc os
+            | o == 34 = "\\\"" ++ enc os
+            | o == 39 = "\\'" ++ enc os
+            | o == 92 = "\\\\" ++ enc os
+            | otherwise = chr (fromIntegral o) : enc os
+
+        eI EDone = EFinal []
+        eI (EChunk bs) = EPart (enc bs) encodeInc
+
+-- | Encode data.
+encode :: [Word8] -> String
+encode = encoder encodeInc
+
+-- {{{1 decode
+-- | Incremental decoder function.
+decodeInc :: DecIncData String -> DecIncRes String
+decodeInc d = dI [] d
+    where
+        dI [] DDone = DFinal [] []
+        dI lo DDone = DFail [] lo
+        dI lo (DChunk s) = doDec [] (lo ++ s)
+            where
+                doDec acc [] = DPart acc (dI [])
+                doDec acc s'@('\\':'x':c0:c1:cs) = let
+                        o = fromHex [c0, c1]
+                    in if isJust o
+                        then doDec (acc ++ [fromJust o]) cs
+                        else DFail acc s'
+                doDec acc s'@('\\':'\\':cs) = doDec (acc ++ [fromIntegral $ ord '\\']) cs
+                doDec acc s'@('\\':'\'':cs) = doDec (acc ++ [fromIntegral $ ord '\'']) cs
+                doDec acc s'@('\\':'\"':cs) = doDec (acc ++ [fromIntegral $ ord '\"']) cs
+                doDec acc s'@(c:cs)
+                    | c /= '\\' = doDec (acc ++ [fromIntegral $ ord c]) cs
+                    | otherwise = DPart acc (dI s')
+
+-- | Decode data.
+decode :: String -> Maybe [Word8]
+decode = decoder decodeInc
+
+-- {{{1 chop
+-- | Chop up a string in parts.
+chop :: Int     -- ^ length of individual lines (values @\< 1@ are ignored)
+    -> String
+    -> [String]
+chop n = let
+        _n = max 1 n
+        _chop [] = []
+        _chop cs = take _n cs : _chop (drop _n cs)
+    in _chop
+
+-- {{{1 unchop
+-- | Concatenate the list of strings into one long string.
+unchop :: [String]
+    -> String
+unchop = foldr (++) ""
-- 
cgit v1.2.3