Data.Text.Internal.Lazy

Warning: this is an internal module, and does not have a stable API or name. Functions in this module may not check or enforce preconditions expected by public modules. Use at your own risk!

A module containing private Text internals. This exposes the Text representation and low level construction functions. Modules which extend the Text system may need to use this module.

Documentation

data Text

Constructors

Empty

Chunk !Text Text

Instances

IsList Text

Eq Text

Data Text

This instance preserves data abstraction at the cost of inefficiency. We omit reflection services for the sake of data abstraction.

This instance was created by copying the updated behavior of Data.Text.Text

Ord Text

Read Text

Show Text

IsString Text

Monoid Text

Binary Text

NFData Text

Typeable * Text

type Item Text = Char

chunk :: Text -> Text -> Text

Smart constructor for Chunk. Guarantees the data type invariant.

empty :: Text

Smart constructor for Empty.

foldrChunks :: (Text -> a -> a) -> a -> Text -> a

Consume the chunks of a lazy Text with a natural right fold.

foldlChunks :: (a -> Text -> a) -> a -> Text -> a

Consume the chunks of a lazy Text with a strict, tail-recursive, accumulating left fold.

Data type invariant and abstraction functions

The data type invariant for lazy Text: Every Text is either Empty or consists of non-null Texts. All functions must preserve this, and the QC properties must check this.

strictInvariant :: Text -> Bool

Check the invariant strictly.

lazyInvariant :: Text -> Text

Check the invariant lazily.

showStructure :: Text -> String

Display the internal structure of a lazy Text.

Chunk allocation sizes

defaultChunkSize :: Int

Currently set to 16 KiB, less the memory management overhead.

smallChunkSize :: Int

Currently set to 128 bytes, less the memory management overhead.

chunkOverhead :: Int

The memory management overhead. Currently this is tuned for GHC only.