Copyright	(c) 2009, 2010 Bryan O'Sullivan
License	BSD-style
Maintainer	bos@serpentine.com
Stability	experimental
Portability	portable
Safe Haskell	Trustworthy
Language	Haskell98

Data.Text.Lazy.Encoding

Contents

Decoding ByteStrings to Text
- Catchable failure
- Controllable error handling
Encoding Text to ByteStrings
Encoding Text using ByteString Builders

Description

Functions for converting lazy Text values to and from lazy ByteString, using several standard encodings.

To gain access to a much larger variety of encodings, use the text-icu package: http://hackage.haskell.org/package/text-icu

Synopsis

Decoding ByteStrings to Text

All of the single-parameter functions for decoding bytestrings encoded in one of the Unicode Transformation Formats (UTF) operate in a strict mode: each will throw an exception if given invalid input.

Each function has a variant, whose name is suffixed with -With, that gives greater control over the handling of decoding errors. For instance, decodeUtf8 will throw an exception, but decodeUtf8With allows the programmer to determine what to do on a decoding error.

decodeASCII :: ByteString -> Text Source

Deprecated: Use decodeUtf8 instead

Deprecated. Decode a ByteString containing 7-bit ASCII encoded text.

This function is deprecated. Use decodeLatin1 instead.

decodeLatin1 :: ByteString -> Text Source

Decode a ByteString containing Latin-1 (aka ISO-8859-1) encoded text.

decodeUtf8 :: ByteString -> Text Source

Decode a ByteString containing UTF-8 encoded text that is known to be valid.

If the input contains any invalid UTF-8 data, an exception will be thrown that cannot be caught in pure code. For more control over the handling of invalid data, use decodeUtf8' or decodeUtf8With.

decodeUtf16LE :: ByteString -> Text Source

Decode text from little endian UTF-16 encoding.

If the input contains any invalid little endian UTF-16 data, an exception will be thrown. For more control over the handling of invalid data, use decodeUtf16LEWith.

decodeUtf16BE :: ByteString -> Text Source

Decode text from big endian UTF-16 encoding.

If the input contains any invalid big endian UTF-16 data, an exception will be thrown. For more control over the handling of invalid data, use decodeUtf16BEWith.

decodeUtf32LE :: ByteString -> Text Source

Decode text from little endian UTF-32 encoding.

If the input contains any invalid little endian UTF-32 data, an exception will be thrown. For more control over the handling of invalid data, use decodeUtf32LEWith.

decodeUtf32BE :: ByteString -> Text Source

Decode text from big endian UTF-32 encoding.

If the input contains any invalid big endian UTF-32 data, an exception will be thrown. For more control over the handling of invalid data, use decodeUtf32BEWith.

Catchable failure

decodeUtf8' :: ByteString -> Either UnicodeException Text Source

Decode a ByteString containing UTF-8 encoded text..

If the input contains any invalid UTF-8 data, the relevant exception will be returned, otherwise the decoded text.

Note: this function is not lazy, as it must decode its entire input before it can return a result. If you need lazy (streaming) decoding, use decodeUtf8With in lenient mode.