Add ByteString version of Attoparsec

11 files changed, 2034 insertions, 18 deletions

diff --git a/.ghci b/.ghci
index 5407b2c3..8312f0ee 100644
--- a/.ghci
+++ b/.ghci
@@ -1 +1 @@
-:set -isrc -itest -idist/build -idist/build/autogen -packageghc -optP-include -optPdist/build/autogen/cabal_macros.h
+:set -isrc -ivendor/attoparsec-0.10.4.0 -itest -idist/build -idist/build/autogen -packageghc -optP-include -optPdist/build/autogen/cabal_macros.h
diff --git a/haddock.cabal b/haddock.cabal
index e4b76b02..d61c78c5 100644
--- a/haddock.cabal
+++ b/haddock.cabal
@@ -74,7 +74,7 @@ executable haddock
   build-depends:
     base >= 4.3 && < 4.8
   if flag(in-ghc-tree)
-    hs-source-dirs: src
+    hs-source-dirs: src, vendor/attoparsec-0.10.4.0
     cpp-options: -DIN_GHC_TREE
     build-depends:
       filepath,
@@ -84,9 +84,20 @@ executable haddock
       array,
       xhtml >= 3000.2 && < 3000.3,
       Cabal >= 1.10,
-      ghc >= 7.7 && < 7.10
+      ghc >= 7.7 && < 7.10,
+      bytestring
+
     other-modules:
       Documentation.Haddock
+      Data.Attoparsec
+      Data.Attoparsec.ByteString
+      Data.Attoparsec.ByteString.Char8
+      Data.Attoparsec.Combinator
+      Data.Attoparsec.Number
+      Data.Attoparsec.ByteString.FastSet
+      Data.Attoparsec.ByteString.Internal
+      Data.Attoparsec.Internal
+      Data.Attoparsec.Internal.Types
       Haddock
       Haddock.Interface
       Haddock.Interface.Rename
@@ -118,15 +129,16 @@ executable haddock
       Haddock.Convert
   else
     build-depends:  haddock
-
-library
-  default-language:     Haskell2010
   -- In a GHC tree - in particular, in a source tarball - we don't
   -- require alex or happy
   if !flag(in-ghc-tree)
     build-tools: alex >= 3, happy >= 1.18
+library
+  default-language:     Haskell2010
+
   build-depends:
     base >= 4.3 && < 4.8,
+    bytestring,
     filepath,
     directory,
     containers,
@@ -134,14 +146,14 @@ library
     array,
     xhtml >= 3000.2 && < 3000.3,
     Cabal >= 1.10,
-    ghc >= 7.4 && < 7.8
+    ghc >= 7.4 && < 7.10
 
   if flag(in-ghc-tree)
     cpp-options: -DIN_GHC_TREE
   else
     build-depends: ghc-paths
 
-  hs-source-dirs:       src
+  hs-source-dirs:       src, vendor/attoparsec-0.10.4.0
   if flag(dev)
     ghc-options:          -funbox-strict-fields -Wall -fwarn-tabs
   else
@@ -151,6 +163,15 @@ library
     Documentation.Haddock
 
   other-modules:
+    Data.Attoparsec
+    Data.Attoparsec.ByteString
+    Data.Attoparsec.ByteString.Char8
+    Data.Attoparsec.Combinator
+    Data.Attoparsec.Number
+    Data.Attoparsec.ByteString.FastSet
+    Data.Attoparsec.ByteString.Internal
+    Data.Attoparsec.Internal
+    Data.Attoparsec.Internal.Types
     Haddock
     Haddock.Interface
     Haddock.Interface.Rename
@@ -200,34 +221,36 @@ test-suite latex-test
   build-depends:    base, directory, process, filepath, Cabal
 
 test-suite spec
+  -- NOTE: As of this writing, Cabal does not properly handle alex/happy for
+  -- test suites.  We work around this by adding dist/build to hs-source-dirs,
+  -- so that the the generated lexer/parser from the library is used.  In
+  -- addition we depend on 'haddock', so that the library is compiled before
+  -- the test suite.
+  --
+  -- The corresponding cabal ticket is here:
+  -- https://github.com/haskell/cabal/issues/943
+  hs-source-dirs:
+      dist/build
   type:             exitcode-stdio-1.0
   default-language: Haskell2010
   main-is:          Spec.hs
   hs-source-dirs:
       test
     , src
+    , vendor/attoparsec-0.10.4.0
 
   other-modules:
       Haddock.ParseSpec
 
   build-depends:
       base
+    , bytestring
     , ghc
     , containers
     , deepseq
     , array
     , hspec
 
-  -- NOTE: As of this writing, Cabal does not properly handle alex/happy for
-  -- test suites.  We work around this by adding dist/build to hs-source-dirs,
-  -- so that the the generated lexer/parser from the library is used.  In
-  -- addition we depend on 'haddock', so that the library is compiled before
-  -- the test suite.
-  --
-  -- The corresponding cabal ticket is here:
-  -- https://github.com/haskell/cabal/issues/943
-  hs-source-dirs:
-      dist/build
   build-depends:
       haddock
 
diff --git a/vendor/attoparsec-0.10.4.0/Data/Attoparsec.hs b/vendor/attoparsec-0.10.4.0/Data/Attoparsec.hs
new file mode 100644
index 00000000..41b4ed30
--- /dev/null
+++ b/vendor/attoparsec-0.10.4.0/Data/Attoparsec.hs
@@ -0,0 +1,18 @@
+-- |
+-- Module      :  Data.Attoparsec
+-- Copyright   :  Bryan O'Sullivan 2007-2011
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  unknown
+--
+-- Simple, efficient combinator parsing for 'ByteString' strings,
+-- loosely based on the Parsec library.
+
+module Data.Attoparsec
+    (
+      module Data.Attoparsec.ByteString
+    ) where
+
+import Data.Attoparsec.ByteString
diff --git a/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString.hs b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString.hs
new file mode 100644
index 00000000..d2f3761c
--- /dev/null
+++ b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString.hs
@@ -0,0 +1,205 @@
+-- |
+-- Module      :  Data.Attoparsec.ByteString
+-- Copyright   :  Bryan O'Sullivan 2007-2011
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  unknown
+--
+-- Simple, efficient combinator parsing for 'B.ByteString' strings,
+-- loosely based on the Parsec library.
+
+module Data.Attoparsec.ByteString
+    (
+    -- * Differences from Parsec
+    -- $parsec
+
+    -- * Incremental input
+    -- $incremental
+
+    -- * Performance considerations
+    -- $performance
+
+    -- * Parser types
+      I.Parser
+    , Result
+    , T.IResult(..)
+    , I.compareResults
+
+    -- * Running parsers
+    , parse
+    , feed
+    , I.parseOnly
+    , parseWith
+    , parseTest
+
+    -- ** Result conversion
+    , maybeResult
+    , eitherResult
+
+    -- * Combinators
+    , (I.<?>)
+    , I.try
+    , module Data.Attoparsec.Combinator
+
+    -- * Parsing individual bytes
+    , I.word8
+    , I.anyWord8
+    , I.notWord8
+    , I.peekWord8
+    , I.satisfy
+    , I.satisfyWith
+    , I.skip
+
+    -- ** Byte classes
+    , I.inClass
+    , I.notInClass
+
+    -- * Efficient string handling
+    , I.string
+    , I.skipWhile
+    , I.take
+    , I.scan
+    , I.takeWhile
+    , I.takeWhile1
+    , I.takeTill
+
+    -- ** Consume all remaining input
+    , I.takeByteString
+    , I.takeLazyByteString
+
+    -- * State observation and manipulation functions
+    , I.endOfInput
+    , I.atEnd
+    ) where
+
+import Data.Attoparsec.Combinator
+import qualified Data.Attoparsec.ByteString.Internal as I
+import qualified Data.Attoparsec.Internal as I
+import qualified Data.ByteString as B
+import Data.Attoparsec.ByteString.Internal (Result, parse)
+import qualified Data.Attoparsec.Internal.Types as T
+
+-- $parsec
+--
+-- Compared to Parsec 3, Attoparsec makes several tradeoffs.  It is
+-- not intended for, or ideal for, all possible uses.
+--
+-- * While Attoparsec can consume input incrementally, Parsec cannot.
+--   Incremental input is a huge deal for efficient and secure network
+--   and system programming, since it gives much more control to users
+--   of the library over matters such as resource usage and the I/O
+--   model to use.
+--
+-- * Much of the performance advantage of Attoparsec is gained via
+--   high-performance parsers such as 'I.takeWhile' and 'I.string'.
+--   If you use complicated combinators that return lists of bytes or
+--   characters, there is less performance difference between the two
+--   libraries.
+--
+-- * Unlike Parsec 3, Attoparsec does not support being used as a
+--   monad transformer.
+--
+-- * Attoparsec is specialised to deal only with strict 'B.ByteString'
+--   input.  Efficiency concerns rule out both lists and lazy
+--   bytestrings.  The usual use for lazy bytestrings would be to
+--   allow consumption of very large input without a large footprint.
+--   For this need, Attoparsec's incremental input provides an
+--   excellent substitute, with much more control over when input
+--   takes place.  If you must use lazy bytestrings, see the 'Lazy'
+--   module, which feeds lazy chunks to a regular parser.
+--
+-- * Parsec parsers can produce more helpful error messages than
+--   Attoparsec parsers.  This is a matter of focus: Attoparsec avoids
+--   the extra book-keeping in favour of higher performance.
+
+-- $incremental
+--
+-- Attoparsec supports incremental input, meaning that you can feed it
+-- a bytestring that represents only part of the expected total amount
+-- of data to parse. If your parser reaches the end of a fragment of
+-- input and could consume more input, it will suspend parsing and
+-- return a 'T.Partial' continuation.
+--
+-- Supplying the 'T.Partial' continuation with another bytestring will
+-- resume parsing at the point where it was suspended. You must be
+-- prepared for the result of the resumed parse to be another
+-- 'T.Partial' continuation.
+--
+-- To indicate that you have no more input, supply the 'T.Partial'
+-- continuation with an empty bytestring.
+--
+-- Remember that some parsing combinators will not return a result
+-- until they reach the end of input.  They may thus cause 'T.Partial'
+-- results to be returned.
+--
+-- If you do not need support for incremental input, consider using
+-- the 'I.parseOnly' function to run your parser.  It will never
+-- prompt for more input.
+
+-- $performance
+--
+-- If you write an Attoparsec-based parser carefully, it can be
+-- realistic to expect it to perform within a factor of 2 of a
+-- hand-rolled C parser (measuring megabytes parsed per second).
+--
+-- To actually achieve high performance, there are a few guidelines
+-- that it is useful to follow.
+--
+-- Use the 'B.ByteString'-oriented parsers whenever possible,
+-- e.g. 'I.takeWhile1' instead of 'many1' 'I.anyWord8'.  There is
+-- about a factor of 100 difference in performance between the two
+-- kinds of parser.
+--
+-- For very simple byte-testing predicates, write them by hand instead
+-- of using 'I.inClass' or 'I.notInClass'.  For instance, both of
+-- these predicates test for an end-of-line byte, but the first is
+-- much faster than the second:
+--
+-- >endOfLine_fast w = w == 13 || w == 10
+-- >endOfLine_slow   = inClass "\r\n"
+--
+-- Make active use of benchmarking and profiling tools to measure,
+-- find the problems with, and improve the performance of your parser.
+
+-- | If a parser has returned a 'T.Partial' result, supply it with more
+-- input.
+feed :: Result r -> B.ByteString -> Result r
+feed f@(T.Fail _ _ _) _ = f
+feed (T.Partial k) d    = k d
+feed (T.Done bs r) d    = T.Done (B.append bs d) r
+{-# INLINE feed #-}
+
+-- | Run a parser and print its result to standard output.
+parseTest :: (Show a) => I.Parser a -> B.ByteString -> IO ()
+parseTest p s = print (parse p s)
+
+-- | Run a parser with an initial input string, and a monadic action
+-- that can supply more input if needed.
+parseWith :: Monad m =>
+             (m B.ByteString)
+          -- ^ An action that will be executed to provide the parser
+          -- with more input, if necessary.  The action must return an
+          -- 'B.empty' string when there is no more input available.
+          -> I.Parser a
+          -> B.ByteString
+          -- ^ Initial input for the parser.
+          -> m (Result a)
+parseWith refill p s = step $ parse p s
+  where step (T.Partial k) = (step . k) =<< refill
+        step r             = return r
+{-# INLINE parseWith #-}
+
+-- | Convert a 'Result' value to a 'Maybe' value. A 'T.Partial' result
+-- is treated as failure.
+maybeResult :: Result r -> Maybe r
+maybeResult (T.Done _ r) = Just r
+maybeResult _            = Nothing
+
+-- | Convert a 'Result' value to an 'Either' value. A 'T.Partial'
+-- result is treated as failure.
+eitherResult :: Result r -> Either String r
+eitherResult (T.Done _ r)     = Right r
+eitherResult (T.Fail _ _ msg) = Left msg
+eitherResult _                = Left "Result: incomplete input"
diff --git a/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString/Char8.hs b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString/Char8.hs
new file mode 100644
index 00000000..3bbe51f0
--- /dev/null
+++ b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString/Char8.hs
@@ -0,0 +1,549 @@
+{-# LANGUAGE BangPatterns, FlexibleInstances, TypeFamilies,
+    TypeSynonymInstances, GADTs #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+-- |
+-- Module      :  Data.Attoparsec.ByteString.Char8
+-- Copyright   :  Bryan O'Sullivan 2007-2011
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  unknown
+--
+-- Simple, efficient, character-oriented combinator parsing for
+-- 'B.ByteString' strings, loosely based on the Parsec library.
+
+module Data.Attoparsec.ByteString.Char8
+    (
+    -- * Character encodings
+    -- $encodings
+
+    -- * Parser types
+      Parser
+    , A.Result
+    , A.IResult(..)
+    , I.compareResults
+
+    -- * Running parsers
+    , A.parse
+    , A.feed
+    , A.parseOnly
+    , A.parseTest
+    , A.parseWith
+
+    -- ** Result conversion
+    , A.maybeResult
+    , A.eitherResult
+
+    -- * Combinators
+    , (I.<?>)
+    , I.try
+    , module Data.Attoparsec.Combinator
+
+    -- * Parsing individual characters
+    , char
+    , char8
+    , anyChar
+    , notChar
+    , peekChar
+    , satisfy
+
+    -- ** Special character parsers
+    , digit
+    , letter_iso8859_15
+    , letter_ascii
+    , space
+
+    -- ** Fast predicates
+    , isDigit
+    , isDigit_w8
+    , isAlpha_iso8859_15
+    , isAlpha_ascii
+    , isSpace
+    , isSpace_w8
+
+    -- *** Character classes
+    , inClass
+    , notInClass
+
+    -- * Efficient string handling
+    , I.string
+    , stringCI
+    , skipSpace
+    , skipWhile
+    , I.take
+    , scan
+    , takeWhile
+    , takeWhile1
+    , takeTill
+
+    -- ** String combinators
+    -- $specalt
+    , (.*>)
+    , (<*.)
+
+    -- ** Consume all remaining input
+    , I.takeByteString
+    , I.takeLazyByteString
+
+    -- * Text parsing
+    , I.endOfLine
+    , isEndOfLine
+    , isHorizontalSpace
+
+    -- * Numeric parsers
+    , decimal
+    , hexadecimal
+    , signed
+    , double
+    , Number(..)
+    , number
+    , rational
+
+    -- * State observation and manipulation functions
+    , I.endOfInput
+    , I.atEnd
+    ) where
+
+import Control.Applicative ((*>), (<*), (<$>), (<|>))
+import Data.Attoparsec.ByteString.FastSet (charClass, memberChar)
+import Data.Attoparsec.ByteString.Internal (Parser, (<?>))
+import Data.Attoparsec.Combinator
+import Data.Attoparsec.Number (Number(..))
+import Data.Bits (Bits, (.|.), shiftL)
+import Data.ByteString.Internal (c2w, w2c)
+import Data.Int (Int8, Int16, Int32, Int64)
+import Data.Ratio ((%))
+import Data.String (IsString(..))
+import Data.Word (Word8, Word16, Word32, Word64, Word)
+import Prelude hiding (takeWhile)
+import qualified Data.Attoparsec.ByteString as A
+import qualified Data.Attoparsec.ByteString.Internal as I
+import qualified Data.Attoparsec.Internal as I
+import qualified Data.ByteString as B8
+import qualified Data.ByteString.Char8 as B
+
+instance (a ~ B.ByteString) => IsString (Parser a) where
+    fromString = I.string . B.pack
+
+-- $encodings
+--
+-- This module is intended for parsing text that is
+-- represented using an 8-bit character set, e.g. ASCII or
+-- ISO-8859-15.  It /does not/ make any attempt to deal with character
+-- encodings, multibyte characters, or wide characters.  In
+-- particular, all attempts to use characters above code point U+00FF
+-- will give wrong answers.
+--
+-- Code points below U+0100 are simply translated to and from their
+-- numeric values, so e.g. the code point U+00A4 becomes the byte
+-- @0xA4@ (which is the Euro symbol in ISO-8859-15, but the generic
+-- currency sign in ISO-8859-1).  Haskell 'Char' values above U+00FF
+-- are truncated, so e.g. U+1D6B7 is truncated to the byte @0xB7@.
+
+-- ASCII-specific but fast, oh yes.
+toLower :: Word8 -> Word8
+toLower w | w >= 65 && w <= 90 = w + 32
+          | otherwise          = w
+
+-- | Satisfy a literal string, ignoring case.
+stringCI :: B.ByteString -> Parser B.ByteString
+stringCI = I.stringTransform (B8.map toLower)
+{-# INLINE stringCI #-}
+
+-- | Consume input as long as the predicate returns 'True', and return
+-- the consumed input.
+--
+-- This parser requires the predicate to succeed on at least one byte
+-- of input: it will fail if the predicate never returns 'True' or if
+-- there is no input left.
+takeWhile1 :: (Char -> Bool) -> Parser B.ByteString
+takeWhile1 p = I.takeWhile1 (p . w2c)
+{-# INLINE takeWhile1 #-}
+
+-- | The parser @satisfy p@ succeeds for any byte for which the
+-- predicate @p@ returns 'True'. Returns the byte that is actually
+-- parsed.
+--
+-- >digit = satisfy isDigit
+-- >    where isDigit c = c >= '0' && c <= '9'
+satisfy :: (Char -> Bool) -> Parser Char
+satisfy = I.satisfyWith w2c
+{-# INLINE satisfy #-}
+
+-- | Match a letter, in the ISO-8859-15 encoding.
+letter_iso8859_15 :: Parser Char
+letter_iso8859_15 = satisfy isAlpha_iso8859_15 <?> "letter_iso8859_15"
+{-# INLINE letter_iso8859_15 #-}
+
+-- | Match a letter, in the ASCII encoding.
+letter_ascii :: Parser Char
+letter_ascii = satisfy isAlpha_ascii <?> "letter_ascii"
+{-# INLINE letter_ascii #-}
+
+-- | A fast alphabetic predicate for the ISO-8859-15 encoding
+--
+-- /Note/: For all character encodings other than ISO-8859-15, and
+-- almost all Unicode code points above U+00A3, this predicate gives
+-- /wrong answers/.
+isAlpha_iso8859_15 :: Char -> Bool
+isAlpha_iso8859_15 c = (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
+                       (c >= '\166' && moby c)
+  where moby = notInClass "\167\169\171-\179\182\183\185\187\191\215\247"
+        {-# NOINLINE moby #-}
+{-# INLINE isAlpha_iso8859_15 #-}
+
+-- | A fast alphabetic predicate for the ASCII encoding
+--
+-- /Note/: For all character encodings other than ASCII, and
+-- almost all Unicode code points above U+007F, this predicate gives
+-- /wrong answers/.
+isAlpha_ascii :: Char -> Bool
+isAlpha_ascii c = (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
+{-# INLINE isAlpha_ascii #-}
+
+-- | Parse a single digit.
+digit :: Parser Char
+digit = satisfy isDigit <?> "digit"
+{-# INLINE digit #-}
+
+-- | A fast digit predicate.
+isDigit :: Char -> Bool
+isDigit c = c >= '0' && c <= '9'
+{-# INLINE isDigit #-}
+
+-- | A fast digit predicate.
+isDigit_w8 :: Word8 -> Bool
+isDigit_w8 w = w >= 48 && w <= 57
+{-# INLINE isDigit_w8 #-}
+
+-- | Match any character.
+anyChar :: Parser Char
+anyChar = satisfy $ const True
+{-# INLINE anyChar #-}
+
+-- | Match any character. Returns 'Nothing' if end of input has been
+-- reached. Does not consume any input.
+--
+-- /Note/: Because this parser does not fail, do not use it with
+-- combinators such as 'many', because such parsers loop until a
+-- failure occurs.  Careless use will thus result in an infinite loop.
+peekChar :: Parser (Maybe Char)
+peekChar = (fmap w2c) `fmap` I.peekWord8
+{-# INLINE peekChar #-}
+
+-- | Fast predicate for matching ASCII space characters.
+--
+-- /Note/: This predicate only gives correct answers for the ASCII
+-- encoding.  For instance, it does not recognise U+00A0 (non-breaking
+-- space) as a space character, even though it is a valid ISO-8859-15
+-- byte. For a Unicode-aware and only slightly slower predicate,
+-- use 'Data.Char.isSpace'
+isSpace :: Char -> Bool
+isSpace c = (c == ' ') || ('\t' <= c && c <= '\r')
+{-# INLINE isSpace #-}
+
+-- | Fast 'Word8' predicate for matching ASCII space characters.
+isSpace_w8 :: Word8 -> Bool
+isSpace_w8 w = (w == 32) || (9 <= w && w <= 13)
+{-# INLINE isSpace_w8 #-}
+
+
+-- | Parse a space character.
+--
+-- /Note/: This parser only gives correct answers for the ASCII
+-- encoding.  For instance, it does not recognise U+00A0 (non-breaking
+-- space) as a space character, even though it is a valid ISO-8859-15
+-- byte.
+space :: Parser Char
+space = satisfy isSpace <?> "space"
+{-# INLINE space #-}
+
+-- | Match a specific character.
+char :: Char -> Parser Char
+char c = satisfy (== c) <?> [c]
+{-# INLINE char #-}
+
+-- | Match a specific character, but return its 'Word8' value.
+char8 :: Char -> Parser Word8
+char8 c = I.satisfy (== c2w c) <?> [c]
+{-# INLINE char8 #-}
+
+-- | Match any character except the given one.
+notChar :: Char -> Parser Char
+notChar c = satisfy (/= c) <?> "not " ++ [c]
+{-# INLINE notChar #-}
+
+-- | Match any character in a set.
+--
+-- >vowel = inClass "aeiou"
+--
+-- Range notation is supported.
+--
+-- >halfAlphabet = inClass "a-nA-N"
+--
+-- To add a literal \'-\' to a set, place it at the beginning or end
+-- of the string.
+inClass :: String -> Char -> Bool
+inClass s = (`memberChar` mySet)
+    where mySet = charClass s
+{-# INLINE inClass #-}
+
+-- | Match any character not in a set.
+notInClass :: String -> Char -> Bool
+notInClass s = not . inClass s
+{-# INLINE notInClass #-}
+
+-- | Consume input as long as the predicate returns 'True', and return
+-- the consumed input.
+--
+-- This parser does not fail.  It will return an empty string if the
+-- predicate returns 'False' on the first byte of input.
+--
+-- /Note/: Because this parser does not fail, do not use it with
+-- combinators such as 'many', because such parsers loop until a
+-- failure occurs.  Careless use will thus result in an infinite loop.
+takeWhile :: (Char -> Bool) -> Parser B.ByteString
+takeWhile p = I.takeWhile (p . w2c)
+{-# INLINE takeWhile #-}
+
+-- | A stateful scanner.  The predicate consumes and transforms a
+-- state argument, and each transformed state is passed to successive
+-- invocations of the predicate on each byte of the input until one
+-- returns 'Nothing' or the input ends.
+--
+-- This parser does not fail.  It will return an empty string if the
+-- predicate returns 'Nothing' on the first byte of input.
+--
+-- /Note/: Because this parser does not fail, do not use it with
+-- combinators such as 'many', because such parsers loop until a
+-- failure occurs.  Careless use will thus result in an infinite loop.
+scan :: s -> (s -> Char -> Maybe s) -> Parser B.ByteString
+scan s0 p = I.scan s0 (\s -> p s . w2c)
+{-# INLINE scan #-}
+
+-- | Consume input as long as the predicate returns 'False'
+-- (i.e. until it returns 'True'), and return the consumed input.
+--
+-- This parser does not fail.  It will return an empty string if the
+-- predicate returns 'True' on the first byte of input.
+--
+-- /Note/: Because this parser does not fail, do not use it with
+-- combinators such as 'many', because such parsers loop until a
+-- failure occurs.  Careless use will thus result in an infinite loop.
+takeTill :: (Char -> Bool) -> Parser B.ByteString
+takeTill p = I.takeTill (p . w2c)
+{-# INLINE takeTill #-}
+
+-- | Skip past input for as long as the predicate returns 'True'.
+skipWhile :: (Char -> Bool) -> Parser ()
+skipWhile p = I.skipWhile (p . w2c)
+{-# INLINE skipWhile #-}
+
+-- | Skip over white space.
+skipSpace :: Parser ()
+skipSpace = I.skipWhile isSpace_w8
+{-# INLINE skipSpace #-}
+
+-- $specalt
+--
+-- The '.*>' and '<*.' combinators are intended for use with the
+-- @OverloadedStrings@ language extension.  They simplify the common
+-- task of matching a statically known string, then immediately
+-- parsing something else.
+--
+-- An example makes this easier to understand:
+--
+-- @{-\# LANGUAGE OverloadedStrings #-}
+--
+-- shoeSize = \"Shoe size: \" '.*>' 'decimal'
+-- @
+--
+-- If we were to try to use '*>' above instead, the type checker would
+-- not be able to tell which 'IsString' instance to use for the text
+-- in quotes.  We would have to be explicit, using either a type
+-- signature or the 'I.string' parser.
+
+-- | Type-specialized version of '*>' for 'B.ByteString'.
+(.*>) :: B.ByteString -> Parser a -> Parser a
+s .*> f = I.string s *> f
+
+-- | Type-specialized version of '<*' for 'B.ByteString'.
+(<*.) :: Parser a -> B.ByteString -> Parser a
+f <*. s = f <* I.string s
+
+-- | A predicate that matches either a carriage return @\'\\r\'@ or
+-- newline @\'\\n\'@ character.
+isEndOfLine :: Word8 -> Bool
+isEndOfLine w = w == 13 || w == 10
+{-# INLINE isEndOfLine #-}
+
+-- | A predicate that matches either a space @\' \'@ or horizontal tab
+-- @\'\\t\'@ character.
+isHorizontalSpace :: Word8 -> Bool
+isHorizontalSpace w = w == 32 || w == 9
+{-# INLINE isHorizontalSpace #-}
+
+-- | Parse and decode an unsigned hexadecimal number.  The hex digits
+-- @\'a\'@ through @\'f\'@ may be upper or lower case.
+--
+-- This parser does not accept a leading @\"0x\"@ string.
+hexadecimal :: (Integral a, Bits a) => Parser a
+hexadecimal = B8.foldl' step 0 `fmap` I.takeWhile1 isHexDigit
+  where
+    isHexDigit w = (w >= 48 && w <= 57) ||
+                   (w >= 97 && w <= 102) ||
+                   (w >= 65 && w <= 70)
+    step a w | w >= 48 && w <= 57  = (a `shiftL` 4) .|. fromIntegral (w - 48)
+             | w >= 97             = (a `shiftL` 4) .|. fromIntegral (w - 87)
+             | otherwise           = (a `shiftL` 4) .|. fromIntegral (w - 55)
+{-# SPECIALISE hexadecimal :: Parser Int #-}
+{-# SPECIALISE hexadecimal :: Parser Int8 #-}
+{-# SPECIALISE hexadecimal :: Parser Int16 #-}
+{-# SPECIALISE hexadecimal :: Parser Int32 #-}
+{-# SPECIALISE hexadecimal :: Parser Int64 #-}
+{-# SPECIALISE hexadecimal :: Parser Integer #-}
+{-# SPECIALISE hexadecimal :: Parser Word #-}
+{-# SPECIALISE hexadecimal :: Parser Word8 #-}
+{-# SPECIALISE hexadecimal :: Parser Word16 #-}
+{-# SPECIALISE hexadecimal :: Parser Word32 #-}
+{-# SPECIALISE hexadecimal :: Parser Word64 #-}
+
+-- | Parse and decode an unsigned decimal number.
+decimal :: Integral a => Parser a
+decimal = B8.foldl' step 0 `fmap` I.takeWhile1 isDig
+  where isDig w  = w >= 48 && w <= 57
+        step a w = a * 10 + fromIntegral (w - 48)
+{-# SPECIALISE decimal :: Parser Int #-}
+{-# SPECIALISE decimal :: Parser Int8 #-}
+{-# SPECIALISE decimal :: Parser Int16 #-}
+{-# SPECIALISE decimal :: Parser Int32 #-}
+{-# SPECIALISE decimal :: Parser Int64 #-}
+{-# SPECIALISE decimal :: Parser Integer #-}
+{-# SPECIALISE decimal :: Parser Word #-}
+{-# SPECIALISE decimal :: Parser Word8 #-}
+{-# SPECIALISE decimal :: Parser Word16 #-}
+{-# SPECIALISE decimal :: Parser Word32 #-}
+{-# SPECIALISE decimal :: Parser Word64 #-}
+
+-- | Parse a number with an optional leading @\'+\'@ or @\'-\'@ sign
+-- character.
+signed :: Num a => Parser a -> Parser a
+{-# SPECIALISE signed :: Parser Int -> Parser Int #-}
+{-# SPECIALISE signed :: Parser Int8 -> Parser Int8 #-}
+{-# SPECIALISE signed :: Parser Int16 -> Parser Int16 #-}
+{-# SPECIALISE signed :: Parser Int32 -> Parser Int32 #-}
+{-# SPECIALISE signed :: Parser Int64 -> Parser Int64 #-}
+{-# SPECIALISE signed :: Parser Integer -> Parser Integer #-}
+signed p = (negate <$> (char8 '-' *> p))
+       <|> (char8 '+' *> p)
+       <|> p
+
+-- | Parse a rational number.
+--
+-- This parser accepts an optional leading sign character, followed by
+-- at least one decimal digit.  The syntax similar to that accepted by
+-- the 'read' function, with the exception that a trailing @\'.\'@ or
+-- @\'e\'@ /not/ followed by a number is not consumed.
+--
+-- Examples with behaviour identical to 'read', if you feed an empty
+-- continuation to the first result:
+--
+-- >rational "3"     == Done 3.0 ""
+-- >rational "3.1"   == Done 3.1 ""
+-- >rational "3e4"   == Done 30000.0 ""
+-- >rational "3.1e4" == Done 31000.0, ""
+--
+-- Examples with behaviour identical to 'read':
+--
+-- >rational ".3"    == Fail "input does not start with a digit"
+-- >rational "e3"    == Fail "input does not start with a digit"
+--
+-- Examples of differences from 'read':
+--
+-- >rational "3.foo" == Done 3.0 ".foo"
+-- >rational "3e"    == Done 3.0 "e"
+--
+-- This function does not accept string representations of \"NaN\" or
+-- \"Infinity\".
+rational :: Fractional a => Parser a
+{-# SPECIALIZE rational :: Parser Double #-}
+{-# SPECIALIZE rational :: Parser Float #-}
+{-# SPECIALIZE rational :: Parser Rational #-}
+rational = floaty $ \real frac fracDenom -> fromRational $
+                     real % 1 + frac % fracDenom
+
+-- | Parse a rational number.
+--
+-- The syntax accepted by this parser is the same as for 'rational'.
+--
+-- /Note/: This function is almost ten times faster than 'rational',
+-- but is slightly less accurate.
+--
+-- The 'Double' type supports about 16 decimal places of accuracy.
+-- For 94.2% of numbers, this function and 'rational' give identical
+-- results, but for the remaining 5.8%, this function loses precision
+-- around the 15th decimal place.  For 0.001% of numbers, this
+-- function will lose precision at the 13th or 14th decimal place.
+--
+-- This function does not accept string representations of \"NaN\" or
+-- \"Infinity\".
+double :: Parser Double
+double = floaty asDouble
+
+asDouble :: Integer -> Integer -> Integer -> Double
+asDouble real frac fracDenom =
+    fromIntegral real + fromIntegral frac / fromIntegral fracDenom
+{-# INLINE asDouble #-}
+
+-- | Parse a number, attempting to preserve both speed and precision.
+--
+-- The syntax accepted by this parser is the same as for 'rational'.
+--
+-- /Note/: This function is almost ten times faster than 'rational'.
+-- On integral inputs, it gives perfectly accurate answers, and on
+-- floating point inputs, it is slightly less accurate than
+-- 'rational'.
+--
+-- This function does not accept string representations of \"NaN\" or
+-- \"Infinity\".
+number :: Parser Number
+number = floaty $ \real frac fracDenom ->
+         if frac == 0 && fracDenom == 0
+         then I real
+         else D (asDouble real frac fracDenom)
+{-# INLINE number #-}
+
+data T = T !Integer !Int
+
+floaty :: Fractional a => (Integer -> Integer -> Integer -> a) -> Parser a
+{-# INLINE floaty #-}
+floaty f = do
+  let minus = 45
+      plus  = 43
+  !positive <- ((== plus) <$> I.satisfy (\c -> c == minus || c == plus)) <|>
+               return True
+  real <- decimal
+  let tryFraction = do
+        let dot = 46
+        _ <- I.satisfy (==dot)
+        ds <- I.takeWhile isDigit_w8
+        case I.parseOnly decimal ds of
+                Right n -> return $ T n (B.length ds)
+                _       -> fail "no digits after decimal"
+  T fraction fracDigits <- tryFraction <|> return (T 0 0)
+  let littleE = 101
+      bigE    = 69
+      e w = w == littleE || w == bigE
+  power <- (I.satisfy e *> signed decimal) <|> return (0::Int)
+  let n = if fracDigits == 0
+          then if power == 0
+               then fromIntegral real
+               else fromIntegral real * (10 ^^ power)
+          else if power == 0
+               then f real fraction (10 ^ fracDigits)
+               else f real fraction (10 ^ fracDigits) * (10 ^^ power)
+  return $ if positive
+           then n
+           else -n
diff --git a/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString/FastSet.hs b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString/FastSet.hs
new file mode 100644
index 00000000..73d02056
--- /dev/null
+++ b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString/FastSet.hs
@@ -0,0 +1,115 @@
+{-# LANGUAGE BangPatterns, MagicHash #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Data.Attoparsec.ByteString.FastSet
+-- Copyright   :  Bryan O'Sullivan 2008
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  unknown
+--
+-- Fast set membership tests for 'Word8' and 8-bit 'Char' values.  The
+-- set representation is unboxed for efficiency.  For small sets, we
+-- test for membership using a binary search.  For larger sets, we use
+-- a lookup table.
+--
+-----------------------------------------------------------------------------
+module Data.Attoparsec.ByteString.FastSet
+    (
+    -- * Data type
+      FastSet
+    -- * Construction
+    , fromList
+    , set
+    -- * Lookup
+    , memberChar
+    , memberWord8
+    -- * Debugging
+    , fromSet
+    -- * Handy interface
+    , charClass
+    ) where
+
+import Data.Bits ((.&.), (.|.))
+import Foreign.Storable (peekByteOff, pokeByteOff)
+import GHC.Base (Int(I#), iShiftRA#, narrow8Word#, shiftL#)
+import GHC.Word (Word8(W8#))
+import qualified Data.ByteString as B
+import qualified Data.ByteString.Char8 as B8
+import qualified Data.ByteString.Internal as I
+import qualified Data.ByteString.Unsafe as U
+
+data FastSet = Sorted { fromSet :: !B.ByteString }
+             | Table  { fromSet :: !B.ByteString }
+    deriving (Eq, Ord)
+
+instance Show FastSet where
+    show (Sorted s) = "FastSet Sorted " ++ show (B8.unpack s)
+    show (Table _) = "FastSet Table"
+
+-- | The lower bound on the size of a lookup table.  We choose this to
+-- balance table density against performance.
+tableCutoff :: Int
+tableCutoff = 8
+
+-- | Create a set.
+set :: B.ByteString -> FastSet
+set s | B.length s < tableCutoff = Sorted . B.sort $ s
+      | otherwise                = Table . mkTable $ s
+
+fromList :: [Word8] -> FastSet
+fromList = set . B.pack
+
+data I = I {-# UNPACK #-} !Int {-# UNPACK #-} !Word8
+
+shiftR :: Int -> Int -> Int
+shiftR (I# x#) (I# i#) = I# (x# `iShiftRA#` i#)
+
+shiftL :: Word8 -> Int -> Word8
+shiftL (W8# x#) (I# i#) = W8# (narrow8Word# (x# `shiftL#` i#))
+
+index :: Int -> I
+index i = I (i `shiftR` 3) (1 `shiftL` (i .&. 7))
+{-# INLINE index #-}
+
+-- | Check the set for membership.
+memberWord8 :: Word8 -> FastSet -> Bool
+memberWord8 w (Table t)  =
+    let I byte bit = index (fromIntegral w)
+    in  U.unsafeIndex t byte .&. bit /= 0
+memberWord8 w (Sorted s) = search 0 (B.length s - 1)
+    where search lo hi
+              | hi < lo = False
+              | otherwise =
+                  let mid = (lo + hi) `div` 2
+                  in case compare w (U.unsafeIndex s mid) of
+                       GT -> search (mid + 1) hi
+                       LT -> search lo (mid - 1)
+                       _ -> True
+
+-- | Check the set for membership.  Only works with 8-bit characters:
+-- characters above code point 255 will give wrong answers.
+memberChar :: Char -> FastSet -> Bool
+memberChar c = memberWord8 (I.c2w c)
+{-# INLINE memberChar #-}
+
+mkTable :: B.ByteString -> B.ByteString
+mkTable s = I.unsafeCreate 32 $ \t -> do
+            _ <- I.memset t 0 32
+            U.unsafeUseAsCStringLen s $ \(p, l) ->
+              let loop n | n == l = return ()
+                         | otherwise = do
+                    c <- peekByteOff p n :: IO Word8
+                    let I byte bit = index (fromIntegral c)
+                    prev <- peekByteOff t byte :: IO Word8
+                    pokeByteOff t byte (prev .|. bit)
+                    loop (n + 1)
+              in loop 0
+
+charClass :: String -> FastSet
+charClass = set . B8.pack . go
+    where go (a:'-':b:xs) = [a..b] ++ go xs
+          go (x:xs) = x : go xs
+          go _ = ""
diff --git a/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString/Internal.hs b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString/Internal.hs
new file mode 100644
index 00000000..b3699728
--- /dev/null
+++ b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/ByteString/Internal.hs
@@ -0,0 +1,516 @@
+{-# LANGUAGE BangPatterns, CPP, Rank2Types, OverloadedStrings,
+    RecordWildCards, MagicHash, UnboxedTuples #-}
+-- |
+-- Module      :  Data.Attoparsec.ByteString.Internal
+-- Copyright   :  Bryan O'Sullivan 2007-2011
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  unknown
+--
+-- Simple, efficient parser combinators for 'B.ByteString' strings,
+-- loosely based on the Parsec library.
+
+module Data.Attoparsec.ByteString.Internal
+    (
+    -- * Parser types
+      Parser
+    , Result
+
+    -- * Running parsers
+    , parse
+    , parseOnly
+
+    -- * Combinators
+    , (<?>)
+    , try
+    , module Data.Attoparsec.Combinator
+
+    -- * Parsing individual bytes
+    , satisfy
+    , satisfyWith
+    , anyWord8
+    , skip
+    , word8
+    , notWord8
+    , peekWord8
+
+    -- ** Byte classes
+    , inClass
+    , notInClass
+
+    -- * Parsing more complicated structures
+    , storable
+
+    -- * Efficient string handling
+    , skipWhile
+    , string
+    , stringTransform
+    , take
+    , scan
+    , takeWhile
+    , takeWhile1
+    , takeTill
+
+    -- ** Consume all remaining input
+    , takeByteString
+    , takeLazyByteString
+
+    -- * State observation and manipulation functions
+    , endOfInput
+    , atEnd
+
+    -- * Utilities
+    , endOfLine
+    ) where
+
+import Control.Applicative ((<|>), (<$>))
+import Control.Monad (when)
+import Data.Attoparsec.ByteString.FastSet (charClass, memberWord8)
+import Data.Attoparsec.Combinator
+import Data.Attoparsec.Internal.Types
+    hiding (Parser, Input, Added, Failure, Success)
+import Data.Monoid (Monoid(..))
+import Data.Word (Word8)
+import Foreign.ForeignPtr (withForeignPtr)
+import Foreign.Ptr (castPtr, minusPtr, plusPtr)
+import Foreign.Storable (Storable(peek, sizeOf))
+import Prelude hiding (getChar, take, takeWhile)
+import qualified Data.Attoparsec.Internal.Types as T
+import qualified Data.ByteString as B8
+import qualified Data.ByteString.Char8 as B
+import qualified Data.ByteString.Internal as B
+import qualified Data.ByteString.Lazy as L
+import qualified Data.ByteString.Unsafe as B
+
+#if defined(__GLASGOW_HASKELL__)
+import GHC.Base (realWorld#)
+import GHC.IO (IO(IO))
+#else
+import System.IO.Unsafe (unsafePerformIO)
+#endif
+
+type Parser = T.Parser B.ByteString
+type Result = IResult B.ByteString
+type Input = T.Input B.ByteString
+type Added = T.Added B.ByteString
+type Failure r = T.Failure B.ByteString r
+type Success a r = T.Success B.ByteString a r
+
+ensure' :: Int -> Input -> Added -> More -> Failure r -> Success B.ByteString r
+        -> IResult B.ByteString r
+ensure' !n0 i0 a0 m0 kf0 ks0 =
+    T.runParser (demandInput >> go n0) i0 a0 m0 kf0 ks0
+  where
+    go !n = T.Parser $ \i a m kf ks ->
+        if B.length (unI i) >= n
+        then ks i a m (unI i)
+        else T.runParser (demandInput >> go n) i a m kf ks
+
+-- | If at least @n@ bytes of input are available, return the current
+-- input, otherwise fail.
+ensure :: Int -> Parser B.ByteString
+ensure !n = T.Parser $ \i0 a0 m0 kf ks ->
+    if B.length (unI i0) >= n
+    then ks i0 a0 m0 (unI i0)
+    -- The uncommon case is kept out-of-line to reduce code size:
+    else ensure' n i0 a0 m0 kf ks
+-- Non-recursive so the bounds check can be inlined:
+{-# INLINE ensure #-}
+
+-- | Ask for input.  If we receive any, pass it to a success
+-- continuation, otherwise to a failure continuation.
+prompt :: Input -> Added -> More
+       -> (Input -> Added -> More -> Result r)
+       -> (Input -> Added -> More -> Result r)
+       -> Result r
+prompt i0 a0 _m0 kf ks = Partial $ \s ->
+    if B.null s
+    then kf i0 a0 Complete
+    else ks (i0 <> I s) (a0 <> A s) Incomplete
+
+-- | Immediately demand more input via a 'Partial' continuation
+-- result.
+demandInput :: Parser ()
+demandInput = T.Parser $ \i0 a0 m0 kf ks ->
+    if m0 == Complete
+    then kf i0 a0 m0 ["demandInput"] "not enough bytes"
+    else let kf' i a m = kf i a m ["demandInput"] "not enough bytes"
+             ks' i a m = ks i a m ()
+         in prompt i0 a0 m0 kf' ks'
+
+-- | This parser always succeeds.  It returns 'True' if any input is
+-- available either immediately or on demand, and 'False' if the end
+-- of all input has been reached.
+wantInput :: Parser Bool
+wantInput = T.Parser $ \i0 a0 m0 _kf ks ->
+  case () of
+    _ | not (B.null (unI i0)) -> ks i0 a0 m0 True
+      | m0 == Complete  -> ks i0 a0 m0 False
+      | otherwise       -> let kf' i a m = ks i a m False
+                               ks' i a m = ks i a m True
+                           in prompt i0 a0 m0 kf' ks'
+
+get :: Parser B.ByteString
+get  = T.Parser $ \i0 a0 m0 _kf ks -> ks i0 a0 m0 (unI i0)
+
+put :: B.ByteString -> Parser ()
+put s = T.Parser $ \_i0 a0 m0 _kf ks -> ks (I s) a0 m0 ()
+
+-- | Attempt a parse, and if it fails, rewind the input so that no
+-- input appears to have been consumed.
+--
+-- This combinator is provided for compatibility with Parsec.
+-- Attoparsec parsers always backtrack on failure.
+try :: Parser a -> Parser a
+try p = p
+{-# INLINE try #-}
+
+-- | The parser @satisfy p@ succeeds for any byte for which the
+-- predicate @p@ returns 'True'. Returns the byte that is actually
+-- parsed.
+--
+-- >digit = satisfy isDigit
+-- >    where isDigit w = w >= 48 && w <= 57
+satisfy :: (Word8 -> Bool) -> Parser Word8
+satisfy p = do
+  s <- ensure 1
+  let !w = B.unsafeHead s
+  if p w
+    then put (B.unsafeTail s) >> return w
+    else fail "satisfy"
+{-# INLINE satisfy #-}
+
+-- | The parser @skip p@ succeeds for any byte for which the predicate
+-- @p@ returns 'True'.
+--
+-- >skipDigit = skip isDigit
+-- >    where isDigit w = w >= 48 && w <= 57
+skip :: (Word8 -> Bool) -> Parser ()
+skip p = do
+  s <- ensure 1
+  if p (B.unsafeHead s)
+    then put (B.unsafeTail s)
+    else fail "skip"
+
+-- | The parser @satisfyWith f p@ transforms a byte, and succeeds if
+-- the predicate @p@ returns 'True' on the transformed value. The
+-- parser returns the transformed byte that was parsed.
+satisfyWith :: (Word8 -> a) -> (a -> Bool) -> Parser a
+satisfyWith f p = do
+  s <- ensure 1
+  let c = f $! B.unsafeHead s
+  if p c
+    then let !t = B.unsafeTail s
+         in put t >> return c
+    else fail "satisfyWith"
+{-# INLINE satisfyWith #-}
+
+storable :: Storable a => Parser a
+storable = hack undefined
+ where
+  hack :: Storable b => b -> Parser b
+  hack dummy = do
+    (fp,o,_) <- B.toForeignPtr `fmap` take (sizeOf dummy)
+    return . B.inlinePerformIO . withForeignPtr fp $ \p ->
+        peek (castPtr $ p `plusPtr` o)
+
+-- | Consume @n@ bytes of input, but succeed only if the predicate
+-- returns 'True'.
+takeWith :: Int -> (B.ByteString -> Bool) -> Parser B.ByteString
+takeWith n0 p = do
+  let n = max n0 0
+  s <- ensure n
+  let h = B.unsafeTake n s
+      t = B.unsafeDrop n s
+  if p h
+    then put t >> return h
+    else fail "takeWith"
+
+-- | Consume exactly @n@ bytes of input.
+take :: Int -> Parser B.ByteString
+take n = takeWith n (const True)
+{-# INLINE take #-}
+
+-- | @string s@ parses a sequence of bytes that identically match
+-- @s@. Returns the parsed string (i.e. @s@).  This parser consumes no
+-- input if it fails (even if a partial match).
+--
+-- /Note/: The behaviour of this parser is different to that of the
+-- similarly-named parser in Parsec, as this one is all-or-nothing.
+-- To illustrate the difference, the following parser will fail under
+-- Parsec given an input of @\"for\"@:
+--
+-- >string "foo" <|> string "for"
+--
+-- The reason for its failure is that the first branch is a
+-- partial match, and will consume the letters @\'f\'@ and @\'o\'@
+-- before failing.  In Attoparsec, the above parser will /succeed/ on
+-- that input, because the failed first branch will consume nothing.
+string :: B.ByteString -> Parser B.ByteString
+string s = takeWith (B.length s) (==s)
+{-# INLINE string #-}
+
+stringTransform :: (B.ByteString -> B.ByteString) -> B.ByteString
+                -> Parser B.ByteString
+stringTransform f s = takeWith (B.length s) ((==f s) . f)
+{-# INLINE stringTransform #-}
+
+-- | Skip past input for as long as the predicate returns 'True'.
+skipWhile :: (Word8 -> Bool) -> Parser ()
+skipWhile p = go
+ where
+  go = do
+    t <- B8.dropWhile p <$> get
+    put t
+    when (B.null t) $ do
+      input <- wantInput
+      when input go
+{-# INLINE skipWhile #-}
+
+-- | Consume input as long as the predicate returns 'False'
+-- (i.e. until it returns 'True'), and return the consumed input.
+--
+-- This parser does not fail.  It will return an empty string if the
+-- predicate returns 'True' on the first byte of input.
+--
+-- /Note/: Because this parser does not fail, do not use it with
+-- combinators such as 'many', because such parsers loop until a
+-- failure occurs.  Careless use will thus result in an infinite loop.
+takeTill :: (Word8 -> Bool) -> Parser B.ByteString
+takeTill p = takeWhile (not . p)
+{-# INLINE takeTill #-}
+
+-- | Consume input as long as the predicate returns 'True', and return
+-- the consumed input.
+--
+-- This parser does not fail.  It will return an empty string if the
+-- predicate returns 'False' on the first byte of input.
+--
+-- /Note/: Because this parser does not fail, do not use it with
+-- combinators such as 'many', because such parsers loop until a
+-- failure occurs.  Careless use will thus result in an infinite loop.
+takeWhile :: (Word8 -> Bool) -> Parser B.ByteString
+takeWhile p = (B.concat . reverse) `fmap` go []
+ where
+  go acc = do
+    (h,t) <- B8.span p <$> get
+    put t
+    if B.null t
+      then do
+        input <- wantInput
+        if input
+          then go (h:acc)
+          else return (h:acc)
+      else return (h:acc)
+{-# INLINE takeWhile #-}
+
+takeRest :: Parser [B.ByteString]
+takeRest = go []
+ where
+  go acc = do
+    input <- wantInput
+    if input
+      then do
+        s <- get
+        put B.empty
+        go (s:acc)
+      else return (reverse acc)
+
+-- | Consume all remaining input and return it as a single string.
+takeByteString :: Parser B.ByteString
+takeByteString = B.concat `fmap` takeRest
+
+-- | Consume all remaining input and return it as a single string.
+takeLazyByteString :: Parser L.ByteString
+takeLazyByteString = L.fromChunks `fmap` takeRest
+
+data T s = T {-# UNPACK #-} !Int s
+
+-- | A stateful scanner.  The predicate consumes and transforms a
+-- state argument, and each transformed state is passed to successive
+-- invocations of the predicate on each byte of the input until one
+-- returns 'Nothing' or the input ends.
+--
+-- This parser does not fail.  It will return an empty string if the
+-- predicate returns 'Nothing' on the first byte of input.
+--
+-- /Note/: Because this parser does not fail, do not use it with
+-- combinators such as 'many', because such parsers loop until a
+-- failure occurs.  Careless use will thus result in an infinite loop.
+scan :: s -> (s -> Word8 -> Maybe s) -> Parser B.ByteString
+scan s0 p = do
+  chunks <- go [] s0
+  case chunks of
+    [x] -> return x
+    xs  -> return $! B.concat $ reverse xs
+ where
+  go acc s1 = do
+    let scanner (B.PS fp off len) =
+          withForeignPtr fp $ \ptr0 -> do
+            let start = ptr0 `plusPtr` off
+                end   = start `plusPtr` len
+                inner ptr !s
+                  | ptr < end = do
+                    w <- peek ptr
+                    case p s w of
+                      Just s' -> inner (ptr `plusPtr` 1) s'
+                      _       -> done (ptr `minusPtr` start) s
+                  | otherwise = done (ptr `minusPtr` start) s
+                done !i !s = return (T i s)
+            inner start s1
+    bs <- get
+    let T i s' = inlinePerformIO $ scanner bs
+        !h = B.unsafeTake i bs
+        !t = B.unsafeDrop i bs
+    put t
+    if B.null t
+      then do
+        input <- wantInput
+        if input
+          then go (h:acc) s'
+          else return (h:acc)
+      else return (h:acc)
+{-# INLINE scan #-}
+
+-- | Consume input as long as the predicate returns 'True', and return
+-- the consumed input.
+--
+-- This parser requires the predicate to succeed on at least one byte
+-- of input: it will fail if the predicate never returns 'True' or if
+-- there is no input left.
+takeWhile1 :: (Word8 -> Bool) -> Parser B.ByteString
+takeWhile1 p = do
+  (`when` demandInput) =<< B.null <$> get
+  (h,t) <- B8.span p <$> get
+  when (B.null h) $ fail "takeWhile1"
+  put t
+  if B.null t
+    then (h<>) `fmap` takeWhile p
+    else return h
+
+-- | Match any byte in a set.
+--
+-- >vowel = inClass "aeiou"
+--
+-- Range notation is supported.
+--
+-- >halfAlphabet = inClass "a-nA-N"
+--
+-- To add a literal @\'-\'@ to a set, place it at the beginning or end
+-- of the string.
+inClass :: String -> Word8 -> Bool
+inClass s = (`memberWord8` mySet)
+    where mySet = charClass s
+          {-# NOINLINE mySet #-}
+{-# INLINE inClass #-}
+
+-- | Match any byte not in a set.
+notInClass :: String -> Word8 -> Bool
+notInClass s = not . inClass s
+{-# INLINE notInClass #-}
+
+-- | Match any byte.
+anyWord8 :: Parser Word8
+anyWord8 = satisfy $ const True
+{-# INLINE anyWord8 #-}
+
+-- | Match a specific byte.
+word8 :: Word8 -> Parser Word8
+word8 c = satisfy (== c) <?> show c
+{-# INLINE word8 #-}
+
+-- | Match any byte except the given one.
+notWord8 :: Word8 -> Parser Word8
+notWord8 c = satisfy (/= c) <?> "not " ++ show c
+{-# INLINE notWord8 #-}
+
+-- | Match any byte. Returns 'Nothing' if end of input has been
+-- reached. Does not consume any input.
+--
+-- /Note/: Because this parser does not fail, do not use it with
+-- combinators such as 'many', because such parsers loop until a
+-- failure occurs.  Careless use will thus result in an infinite loop.
+peekWord8 :: Parser (Maybe Word8)
+peekWord8 = T.Parser $ \i0 a0 m0 _kf ks ->
+            if B.null (unI i0)
+            then if m0 == Complete
+                 then ks i0 a0 m0 Nothing
+                 else let ks' i a m = let !w = B.unsafeHead (unI i)
+                                      in ks i a m (Just w)
+                          kf' i a m = ks i a m Nothing
+                      in prompt i0 a0 m0 kf' ks'
+            else let !w = B.unsafeHead (unI i0)
+                 in ks i0 a0 m0 (Just w)
+{-# INLINE peekWord8 #-}
+
+-- | Match only if all input has been consumed.
+endOfInput :: Parser ()
+endOfInput = T.Parser $ \i0 a0 m0 kf ks ->
+             if B.null (unI i0)
+             then if m0 == Complete
+                  then ks i0 a0 m0 ()
+                  else let kf' i1 a1 m1 _ _ = addS i0 a0 m0 i1 a1 m1 $
+                                              \ i2 a2 m2 -> ks i2 a2 m2 ()
+                           ks' i1 a1 m1 _   = addS i0 a0 m0 i1 a1 m1 $
+                                              \ i2 a2 m2 -> kf i2 a2 m2 []
+                                                            "endOfInput"
+                       in  T.runParser demandInput i0 a0 m0 kf' ks'
+             else kf i0 a0 m0 [] "endOfInput"
+
+-- | Return an indication of whether the end of input has been
+-- reached.
+atEnd :: Parser Bool
+atEnd = not <$> wantInput
+{-# INLINE atEnd #-}
+
+-- | Match either a single newline character @\'\\n\'@, or a carriage
+-- return followed by a newline character @\"\\r\\n\"@.
+endOfLine :: Parser ()
+endOfLine = (word8 10 >> return ()) <|> (string "\r\n" >> return ())
+
+-- | Name the parser, in case failure occurs.
+(<?>) :: Parser a
+      -> String                 -- ^ the name to use if parsing fails
+      -> Parser a
+p <?> msg0 = T.Parser $ \i0 a0 m0 kf ks ->
+             let kf' i a m strs msg = kf i a m (msg0:strs) msg
+             in T.runParser p i0 a0 m0 kf' ks
+{-# INLINE (<?>) #-}
+infix 0 <?>
+
+-- | Terminal failure continuation.
+failK :: Failure a
+failK i0 _a0 _m0 stack msg = Fail (unI i0) stack msg
+{-# INLINE failK #-}
+
+-- | Terminal success continuation.
+successK :: Success a a
+successK i0 _a0 _m0 a = Done (unI i0) a
+{-# INLINE successK #-}
+
+-- | Run a parser.
+parse :: Parser a -> B.ByteString -> Result a
+parse m s = T.runParser m (I s) mempty Incomplete failK successK
+{-# INLINE parse #-}
+
+-- | Run a parser that cannot be resupplied via a 'Partial' result.
+parseOnly :: Parser a -> B.ByteString -> Either String a
+parseOnly m s = case T.runParser m (I s) mempty Complete failK successK of
+                  Fail _ _ err -> Left err
+                  Done _ a     -> Right a
+                  _            -> error "parseOnly: impossible error!"
+{-# INLINE parseOnly #-}
+
+-- | Just like unsafePerformIO, but we inline it. Big performance gains as
+-- it exposes lots of things to further inlining. /Very unsafe/. In
+-- particular, you should do no memory allocation inside an
+-- 'inlinePerformIO' block. On Hugs this is just @unsafePerformIO@.
+inlinePerformIO :: IO a -> a
+#if defined(__GLASGOW_HASKELL__)
+inlinePerformIO (IO m) = case m realWorld# of (# _, r #) -> r
+#else
+inlinePerformIO = unsafePerformIO
+#endif
+{-# INLINE inlinePerformIO #-}
diff --git a/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Combinator.hs b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Combinator.hs
new file mode 100644
index 00000000..cb9cee83
--- /dev/null
+++ b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Combinator.hs
@@ -0,0 +1,205 @@
+{-# LANGUAGE BangPatterns, CPP #-}
+-- |
+-- Module      :  Data.Attoparsec.Combinator
+-- Copyright   :  Daan Leijen 1999-2001, Bryan O'Sullivan 2009-2010
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  portable
+--
+-- Useful parser combinators, similar to those provided by Parsec.
+module Data.Attoparsec.Combinator
+    (
+      choice
+    , count
+    , option
+    , many'
+    , many1
+    , many1'
+    , manyTill
+    , manyTill'
+    , sepBy
+    , sepBy'
+    , sepBy1
+    , sepBy1'
+    , skipMany
+    , skipMany1
+    , eitherP
+    ) where
+
+import Control.Applicative (Alternative(..), Applicative(..), empty, liftA2,
+                            (<|>), (*>), (<$>))
+import Control.Monad (MonadPlus(..))
+#if !MIN_VERSION_base(4,2,0)
+import Control.Applicative (many)
+#endif
+
+#if __GLASGOW_HASKELL__ >= 700
+import Data.Attoparsec.Internal.Types (Parser)
+import Data.ByteString (ByteString)
+#endif
+
+-- | @choice ps@ tries to apply the actions in the list @ps@ in order,
+-- until one of them succeeds. Returns the value of the succeeding
+-- action.
+choice :: Alternative f => [f a] -> f a
+choice = foldr (<|>) empty
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE choice :: [Parser ByteString a] -> Parser ByteString a #-}
+#endif
+
+-- | @option x p@ tries to apply action @p@. If @p@ fails without
+-- consuming input, it returns the value @x@, otherwise the value
+-- returned by @p@.
+--
+-- > priority  = option 0 (digitToInt <$> digit)
+option :: Alternative f => a -> f a -> f a
+option x p = p <|> pure x
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE option :: a -> Parser ByteString a -> Parser ByteString a #-}
+#endif
+
+-- | A version of 'liftM2' that is strict in the result of its first
+-- action.
+liftM2' :: (Monad m) => (a -> b -> c) -> m a -> m b -> m c
+liftM2' f a b = do
+  !x <- a
+  y <- b
+  return (f x y)
+{-# INLINE liftM2' #-}
+
+-- | @many' p@ applies the action @p@ /zero/ or more times. Returns a
+-- list of the returned values of @p@. The value returned by @p@ is
+-- forced to WHNF.
+--
+-- >  word  = many' letter
+many' :: (MonadPlus m) => m a -> m [a]
+many' p = many_p
+  where many_p = some_p `mplus` return []
+        some_p = liftM2' (:) p many_p
+{-# INLINE many' #-}
+
+-- | @many1 p@ applies the action @p@ /one/ or more times. Returns a
+-- list of the returned values of @p@.
+--
+-- >  word  = many1 letter
+many1 :: Alternative f => f a -> f [a]
+many1 p = liftA2 (:) p (many p)
+{-# INLINE many1 #-}
+
+-- | @many1' p@ applies the action @p@ /one/ or more times. Returns a
+-- list of the returned values of @p@. The value returned by @p@ is
+-- forced to WHNF.
+--
+-- >  word  = many1' letter
+many1' :: (MonadPlus m) => m a -> m [a]
+many1' p = liftM2' (:) p (many' p)
+{-# INLINE many1' #-}
+
+-- | @sepBy p sep@ applies /zero/ or more occurrences of @p@, separated
+-- by @sep@. Returns a list of the values returned by @p@.
+--
+-- > commaSep p  = p `sepBy` (symbol ",")
+sepBy :: Alternative f => f a -> f s -> f [a]
+sepBy p s = liftA2 (:) p ((s *> sepBy1 p s) <|> pure []) <|> pure []
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE sepBy :: Parser ByteString a -> Parser ByteString s
+                     -> Parser ByteString [a] #-}
+#endif
+
+-- | @sepBy' p sep@ applies /zero/ or more occurrences of @p@, separated
+-- by @sep@. Returns a list of the values returned by @p@. The value
+-- returned by @p@ is forced to WHNF.
+--
+-- > commaSep p  = p `sepBy'` (symbol ",")
+sepBy' :: (MonadPlus m) => m a -> m s -> m [a]
+sepBy' p s = scan `mplus` return []
+  where scan = liftM2' (:) p ((s >> sepBy1' p s) `mplus` return [])
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE sepBy' :: Parser ByteString a -> Parser ByteString s
+                      -> Parser ByteString [a] #-}
+#endif
+
+-- | @sepBy1 p sep@ applies /one/ or more occurrences of @p@, separated
+-- by @sep@. Returns a list of the values returned by @p@.
+--
+-- > commaSep p  = p `sepBy1` (symbol ",")
+sepBy1 :: Alternative f => f a -> f s -> f [a]
+sepBy1 p s = scan
+    where scan = liftA2 (:) p ((s *> scan) <|> pure [])
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE sepBy1 :: Parser ByteString a -> Parser ByteString s
+                      -> Parser ByteString [a] #-}
+#endif
+
+-- | @sepBy1' p sep@ applies /one/ or more occurrences of @p@, separated
+-- by @sep@. Returns a list of the values returned by @p@. The value
+-- returned by @p@ is forced to WHNF.
+--
+-- > commaSep p  = p `sepBy1'` (symbol ",")
+sepBy1' :: (MonadPlus m) => m a -> m s -> m [a]
+sepBy1' p s = scan
+    where scan = liftM2' (:) p ((s >> scan) `mplus` return [])
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE sepBy1' :: Parser ByteString a -> Parser ByteString s
+                       -> Parser ByteString [a] #-}
+#endif
+
+-- | @manyTill p end@ applies action @p@ /zero/ or more times until
+-- action @end@ succeeds, and returns the list of values returned by
+-- @p@.  This can be used to scan comments:
+--
+-- >  simpleComment   = string "<!--" *> manyTill anyChar (try (string "-->"))
+--
+-- Note the overlapping parsers @anyChar@ and @string \"<!--\"@, and
+-- therefore the use of the 'try' combinator.
+manyTill :: Alternative f => f a -> f b -> f [a]
+manyTill p end = scan
+    where scan = (end *> pure []) <|> liftA2 (:) p scan
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE manyTill :: Parser ByteString a -> Parser ByteString b
+                        -> Parser ByteString [a] #-}
+#endif
+
+-- | @manyTill' p end@ applies action @p@ /zero/ or more times until
+-- action @end@ succeeds, and returns the list of values returned by
+-- @p@.  This can be used to scan comments:
+--
+-- >  simpleComment   = string "<!--" *> manyTill' anyChar (try (string "-->"))
+--
+-- Note the overlapping parsers @anyChar@ and @string \"<!--\"@, and
+-- therefore the use of the 'try' combinator. The value returned by @p@
+-- is forced to WHNF.
+manyTill' :: (MonadPlus m) => m a -> m b -> m [a]
+manyTill' p end = scan
+    where scan = (end >> return []) `mplus` liftM2' (:) p scan
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE manyTill' :: Parser ByteString a -> Parser ByteString b
+                         -> Parser ByteString [a] #-}
+#endif
+
+-- | Skip zero or more instances of an action.
+skipMany :: Alternative f => f a -> f ()
+skipMany p = scan
+    where scan = (p *> scan) <|> pure ()
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE skipMany :: Parser ByteString a -> Parser ByteString () #-}
+#endif
+
+-- | Skip one or more instances of an action.
+skipMany1 :: Alternative f => f a -> f ()
+skipMany1 p = p *> skipMany p
+#if __GLASGOW_HASKELL__ >= 700
+{-# SPECIALIZE skipMany1 :: Parser ByteString a -> Parser ByteString () #-}
+#endif
+
+-- | Apply the given action repeatedly, returning every result.
+count :: Monad m => Int -> m a -> m [a]
+count n p = sequence (replicate n p)
+{-# INLINE count #-}
+
+-- | Combine two alternatives.
+eitherP :: (Alternative f) => f a -> f b -> f (Either a b)
+eitherP a b = (Left <$> a) <|> (Right <$> b)
+{-# INLINE eitherP #-}
diff --git a/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Internal.hs b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Internal.hs
new file mode 100644
index 00000000..0572d682
--- /dev/null
+++ b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Internal.hs
@@ -0,0 +1,31 @@
+-- |
+-- Module      :  Data.Attoparsec.Internal
+-- Copyright   :  Bryan O'Sullivan 2012
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  unknown
+--
+-- Simple, efficient parser combinators, loosely based on the Parsec
+-- library.
+
+module Data.Attoparsec.Internal
+    (
+      compareResults
+    ) where
+
+import Data.Attoparsec.Internal.Types (IResult(..))
+
+-- | Compare two 'IResult' values for equality.
+--
+-- If both 'IResult's are 'Partial', the result will be 'Nothing', as
+-- they are incomplete and hence their equality cannot be known.
+-- (This is why there is no 'Eq' instance for 'IResult'.)
+compareResults :: (Eq t, Eq r) => IResult t r -> IResult t r -> Maybe Bool
+compareResults (Fail i0 ctxs0 msg0) (Fail i1 ctxs1 msg1) =
+    Just (i0 == i1 && ctxs0 == ctxs1 && msg0 == msg1)
+compareResults (Done i0 r0) (Done i1 r1) =
+    Just (i0 == i1 && r0 == r1)
+compareResults (Partial _) (Partial _) = Nothing
+compareResults _ _ = Just False
diff --git a/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Internal/Types.hs b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Internal/Types.hs
new file mode 100644
index 00000000..e47e5c9e
--- /dev/null
+++ b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Internal/Types.hs
@@ -0,0 +1,227 @@
+{-# LANGUAGE BangPatterns, CPP, GeneralizedNewtypeDeriving, OverloadedStrings,
+    Rank2Types, RecordWildCards #-}
+-- |
+-- Module      :  Data.Attoparsec.Internal.Types
+-- Copyright   :  Bryan O'Sullivan 2007-2011
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  unknown
+--
+-- Simple, efficient parser combinators, loosely based on the Parsec
+-- library.
+
+module Data.Attoparsec.Internal.Types
+    (
+      Parser(..)
+    , Failure
+    , Success
+    , IResult(..)
+    , Input(..)
+    , Added(..)
+    , More(..)
+    , addS
+    , (<>)
+    ) where
+
+import Control.Applicative (Alternative(..), Applicative(..), (<$>))
+import Control.DeepSeq (NFData(rnf))
+import Control.Monad (MonadPlus(..))
+import Data.Monoid (Monoid(..))
+import Prelude hiding (getChar, take, takeWhile)
+
+-- | The result of a parse.  This is parameterised over the type @t@
+-- of string that was processed.
+--
+-- This type is an instance of 'Functor', where 'fmap' transforms the
+-- value in a 'Done' result.
+data IResult t r = Fail t [String] String
+                 -- ^ The parse failed.  The 't' parameter is the
+                 -- input that had not yet been consumed when the
+                 -- failure occurred.  The @[@'String'@]@ is a list of
+                 -- contexts in which the error occurred.  The
+                 -- 'String' is the message describing the error, if
+                 -- any.
+                 | Partial (t -> IResult t r)
+                 -- ^ Supply this continuation with more input so that
+                 -- the parser can resume.  To indicate that no more
+                 -- input is available, use an empty string.
+                 | Done t r
+                 -- ^ The parse succeeded.  The 't' parameter is the
+                 -- input that had not yet been consumed (if any) when
+                 -- the parse succeeded.
+
+instance (Show t, Show r) => Show (IResult t r) where
+    show (Fail t stk msg) =
+        "Fail " ++ show t ++ " " ++ show stk ++ " " ++ show msg
+    show (Partial _)      = "Partial _"
+    show (Done t r)       = "Done " ++ show t ++ " " ++ show r
+
+instance (NFData t, NFData r) => NFData (IResult t r) where
+    rnf (Fail t stk msg) = rnf t `seq` rnf stk `seq` rnf msg
+    rnf (Partial _)  = ()
+    rnf (Done t r)   = rnf t `seq` rnf r
+    {-# INLINE rnf #-}
+
+fmapR :: (a -> b) -> IResult t a -> IResult t b
+fmapR _ (Fail t stk msg) = Fail t stk msg
+fmapR f (Partial k)       = Partial (fmapR f . k)
+fmapR f (Done t r)       = Done t (f r)
+
+instance Functor (IResult t) where
+    fmap = fmapR
+    {-# INLINE fmap #-}
+
+newtype Input t = I {unI :: t} deriving (Monoid)
+newtype Added t = A {unA :: t} deriving (Monoid)
+
+-- | The core parser type.  This is parameterised over the type @t@ of
+-- string being processed.
+--
+-- This type is an instance of the following classes:
+--
+-- * 'Monad', where 'fail' throws an exception (i.e. fails) with an
+--   error message.
+--
+-- * 'Functor' and 'Applicative', which follow the usual definitions.
+--
+-- * 'MonadPlus', where 'mzero' fails (with no error message) and
+--   'mplus' executes the right-hand parser if the left-hand one
+--   fails.  When the parser on the right executes, the input is reset
+--   to the same state as the parser on the left started with. (In
+--   other words, Attoparsec is a backtracking parser that supports
+--   arbitrary lookahead.)
+--
+-- * 'Alternative', which follows 'MonadPlus'.
+newtype Parser t a = Parser {
+      runParser :: forall r. Input t -> Added t -> More
+                -> Failure t   r
+                -> Success t a r
+                -> IResult t r
+    }
+
+type Failure t   r = Input t -> Added t -> More -> [String] -> String
+                   -> IResult t r
+type Success t a r = Input t -> Added t -> More -> a -> IResult t r
+
+-- | Have we read all available input?
+data More = Complete | Incomplete
+            deriving (Eq, Show)
+
+instance Monoid More where
+    mappend c@Complete _ = c
+    mappend _ m          = m
+    mempty               = Incomplete
+
+addS :: (Monoid t) =>
+        Input t -> Added t -> More
+     -> Input t -> Added t -> More
+     -> (Input t -> Added t -> More -> r) -> r
+addS i0 a0 m0 _i1 a1 m1 f =
+    let !i = i0 <> I (unA a1)
+        a  = a0 <> a1
+        !m = m0 <> m1
+    in f i a m
+{-# INLINE addS #-}
+
+bindP :: Parser t a -> (a -> Parser t b) -> Parser t b
+bindP m g =
+    Parser $ \i0 a0 m0 kf ks -> runParser m i0 a0 m0 kf $
+                                \i1 a1 m1 a -> runParser (g a) i1 a1 m1 kf ks
+{-# INLINE bindP #-}
+
+returnP :: a -> Parser t a
+returnP a = Parser (\i0 a0 m0 _kf ks -> ks i0 a0 m0 a)
+{-# INLINE returnP #-}
+
+instance Monad (Parser t) where
+    return = returnP
+    (>>=)  = bindP
+    fail   = failDesc
+
+noAdds :: (Monoid t) =>
+          Input t -> Added t -> More
+       -> (Input t -> Added t -> More -> r) -> r
+noAdds i0 _a0 m0 f = f i0 mempty m0
+{-# INLINE noAdds #-}
+
+plus :: (Monoid t) => Parser t a -> Parser t a -> Parser t a
+plus a b = Parser $ \i0 a0 m0 kf ks ->
+           let kf' i1 a1 m1 _ _ = addS i0 a0 m0 i1 a1 m1 $
+                                  \ i2 a2 m2 -> runParser b i2 a2 m2 kf ks
+               ks' i1 a1 m1 = ks i1 (a0 <> a1) m1
+           in  noAdds i0 a0 m0 $ \i2 a2 m2 -> runParser a i2 a2 m2 kf' ks'
+{-# INLINE plus #-}
+
+instance (Monoid t) => MonadPlus (Parser t) where
+    mzero = failDesc "mzero"
+    {-# INLINE mzero #-}
+    mplus = plus
+
+fmapP :: (a -> b) -> Parser t a -> Parser t b
+fmapP p m = Parser $ \i0 a0 m0 f k ->
+            runParser m i0 a0 m0 f $ \i1 a1 s1 a -> k i1 a1 s1 (p a)
+{-# INLINE fmapP #-}
+
+instance Functor (Parser t) where
+    fmap = fmapP
+    {-# INLINE fmap #-}
+
+apP :: Parser t (a -> b) -> Parser t a -> Parser t b
+apP d e = do
+  b <- d
+  a <- e
+  return (b a)
+{-# INLINE apP #-}
+
+instance Applicative (Parser t) where
+    pure   = returnP
+    {-# INLINE pure #-}
+    (<*>)  = apP
+    {-# INLINE (<*>) #-}
+
+#if MIN_VERSION_base(4,2,0)
+    -- These definitions are equal to the defaults, but this
+    -- way the optimizer doesn't have to work so hard to figure
+    -- that out.
+    (*>)   = (>>)
+    {-# INLINE (*>) #-}
+    x <* y = x >>= \a -> y >> return a
+    {-# INLINE (<*) #-}
+#endif
+
+instance (Monoid t) => Monoid (Parser t a) where
+    mempty  = failDesc "mempty"
+    {-# INLINE mempty #-}
+    mappend = plus
+    {-# INLINE mappend #-}
+
+instance (Monoid t) => Alternative (Parser t) where
+    empty = failDesc "empty"
+    {-# INLINE empty #-}
+
+    (<|>) = plus
+    {-# INLINE (<|>) #-}
+
+#if MIN_VERSION_base(4,2,0)
+    many v = many_v
+        where many_v = some_v <|> pure []
+              some_v = (:) <$> v <*> many_v
+    {-# INLINE many #-}
+
+    some v = some_v
+      where
+        many_v = some_v <|> pure []
+        some_v = (:) <$> v <*> many_v
+    {-# INLINE some #-}
+#endif
+
+failDesc :: String -> Parser t a
+failDesc err = Parser (\i0 a0 m0 kf _ks -> kf i0 a0 m0 [] msg)
+    where msg = "Failed reading: " ++ err
+{-# INLINE failDesc #-}
+
+(<>) :: (Monoid m) => m -> m -> m
+(<>) = mappend
+{-# INLINE (<>) #-}
diff --git a/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Number.hs b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Number.hs
new file mode 100644
index 00000000..bf175f4b
--- /dev/null
+++ b/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Number.hs
@@ -0,0 +1,127 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+-- |
+-- Module      :  Data.Attoparsec.Number
+-- Copyright   :  Bryan O'Sullivan 2011
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  unknown
+--
+-- A simple number type, useful for parsing both exact and inexact
+-- quantities without losing much precision.
+module Data.Attoparsec.Number
+    (
+      Number(..)
+    ) where
+
+import Control.DeepSeq (NFData(rnf))
+import Data.Data (Data)
+import Data.Function (on)
+import Data.Typeable (Typeable)
+
+-- | A numeric type that can represent integers accurately, and
+-- floating point numbers to the precision of a 'Double'.
+data Number = I !Integer
+            | D {-# UNPACK #-} !Double
+              deriving (Typeable, Data)
+
+instance Show Number where
+    show (I a) = show a
+    show (D a) = show a
+
+instance NFData Number where
+    rnf (I _) = ()
+    rnf (D _) = ()
+    {-# INLINE rnf #-}
+
+binop :: (Integer -> Integer -> a) -> (Double -> Double -> a)
+      -> Number -> Number -> a
+binop _ d (D a) (D b) = d a b
+binop i _ (I a) (I b) = i a b
+binop _ d (D a) (I b) = d a (fromIntegral b)
+binop _ d (I a) (D b) = d (fromIntegral a) b
+{-# INLINE binop #-}
+
+instance Eq Number where
+    (==) = binop (==) (==)
+    {-# INLINE (==) #-}
+
+    (/=) = binop (/=) (/=)
+    {-# INLINE (/=) #-}
+
+instance Ord Number where
+    (<) = binop (<) (<)
+    {-# INLINE (<) #-}
+
+    (<=) = binop (<=) (<=)
+    {-# INLINE (<=) #-}
+
+    (>) = binop (>) (>)
+    {-# INLINE (>) #-}
+
+    (>=) = binop (>=) (>=)
+    {-# INLINE (>=) #-}
+
+    compare = binop compare compare
+    {-# INLINE compare #-}
+
+instance Num Number where
+    (+) = binop (((I$!).) . (+)) (((D$!).) . (+))
+    {-# INLINE (+) #-}
+
+    (-) = binop (((I$!).) . (-)) (((D$!).) . (-))
+    {-# INLINE (-) #-}
+
+    (*) = binop (((I$!).) . (*)) (((D$!).) . (*))
+    {-# INLINE (*) #-}
+
+    abs (I a) = I $! abs a
+    abs (D a) = D $! abs a
+    {-# INLINE abs #-}
+
+    negate (I a) = I $! negate a
+    negate (D a) = D $! negate a
+    {-# INLINE negate #-}
+
+    signum (I a) = I $! signum a
+    signum (D a) = D $! signum a
+    {-# INLINE signum #-}
+
+    fromInteger = (I$!) . fromInteger
+    {-# INLINE fromInteger #-}
+
+instance Real Number where
+    toRational (I a) = fromIntegral a
+    toRational (D a) = toRational a
+    {-# INLINE toRational #-}
+
+instance Fractional Number where
+    fromRational = (D$!) . fromRational
+    {-# INLINE fromRational #-}
+
+    (/) = binop (((D$!).) . (/) `on` fromIntegral)
+                (((D$!).) . (/))
+    {-# INLINE (/) #-}
+
+    recip (I a) = D $! recip (fromIntegral a)
+    recip (D a) = D $! recip a
+    {-# INLINE recip #-}
+
+instance RealFrac Number where
+    properFraction (I a) = (fromIntegral a,0)
+    properFraction (D a) = case properFraction a of
+                             (i,d) -> (i,D d)
+    {-# INLINE properFraction #-}
+    truncate (I a) = fromIntegral a
+    truncate (D a) = truncate a
+    {-# INLINE truncate #-}
+    round (I a) = fromIntegral a
+    round (D a) = round a
+    {-# INLINE round #-}
+    ceiling (I a) = fromIntegral a
+    ceiling (D a) = ceiling a
+    {-# INLINE ceiling #-}
+    floor (I a) = fromIntegral a
+    floor (D a) = floor a
+    {-# INLINE floor #-}