ghc-7.6.3: The GHC API

Safe Haskell | None

StringBuffer

Contents

- Creation/destruction
- Inspection
- Moving and comparison
- Conversion
- Parsing integers

Synopsis

- data StringBuffer = StringBuffer {
  - buf :: !(ForeignPtr Word8)
  - len :: !Int
  - cur :: !Int
  }
- hGetStringBuffer :: FilePath -> IO StringBuffer
- hGetStringBufferBlock :: Handle -> Int -> IO StringBuffer
- appendStringBuffers :: StringBuffer -> StringBuffer -> IO StringBuffer
- stringToStringBuffer :: String -> StringBuffer
- nextChar :: StringBuffer -> (Char, StringBuffer)
- currentChar :: StringBuffer -> Char
- prevChar :: StringBuffer -> Char -> Char
- atEnd :: StringBuffer -> Bool
- stepOn :: StringBuffer -> StringBuffer
- offsetBytes :: Int -> StringBuffer -> StringBuffer
- byteDiff :: StringBuffer -> StringBuffer -> Int
- lexemeToString :: StringBuffer -> Int -> String
- lexemeToFastString :: StringBuffer -> Int -> FastString
- parseUnsignedInteger :: StringBuffer -> Int -> Integer -> (Char -> Int) -> Integer

# Documentation

data StringBuffer

A StringBuffer is an internal pointer to a sized chunk of bytes. The bytes are intended to be *immutable*. There are pure operations to read the contents of a StringBuffer.

A StringBuffer may have a finalizer, depending on how it was obtained.

Constructors

StringBuffer |
Fields buf :: !(ForeignPtr Word8) len :: !Int cur :: !Int

Instances

Show StringBuffer |

# Creation/destruction

hGetStringBuffer :: FilePath -> IO StringBuffer

hGetStringBufferBlock :: Handle -> Int -> IO StringBuffer

appendStringBuffers :: StringBuffer -> StringBuffer -> IO StringBuffer

stringToStringBuffer :: String -> StringBuffer

# Inspection

nextChar :: StringBuffer -> (Char, StringBuffer)

currentChar :: StringBuffer -> Char

prevChar :: StringBuffer -> Char -> Char

atEnd :: StringBuffer -> Bool

# Moving and comparison

stepOn :: StringBuffer -> StringBuffer

offsetBytes :: Int -> StringBuffer -> StringBuffer

byteDiff :: StringBuffer -> StringBuffer -> Int

# Conversion

lexemeToString :: StringBuffer -> Int -> String

lexemeToFastString :: StringBuffer -> Int -> FastString

# Parsing integers

parseUnsignedInteger :: StringBuffer -> Int -> Integer -> (Char -> Int) -> Integer

XXX assumes ASCII digits only (by using byteOff)