text-0.10.0.2: An efficient packed Unicode text type.ContentsIndex
Data.Text.Lazy.Builder
Portabilityportable to Hugs and GHC
Stabilityexperimental
MaintainerJohan Tibell <johan.tibell@gmail.com>
Contents
The Builder type
Constructing Builders
Flushing the buffer state
Description

Efficient construction of lazy Text values. The principal operations on a Builder are singleton, fromText, and fromLazyText, which construct new builders, and mappend, which concatenates two builders.

To get maximum performance when building lazy Text values using a builder, associate mappend calls to the right. For example, prefer

 singleton 'a' `mappend` (singleton 'b' `mappend` singleton 'c')

to

 singleton 'a' `mappend` singleton 'b' `mappend` singleton 'c'

as the latter associates mappend to the left.

Synopsis
data Builder
toLazyText :: Builder -> Text
toLazyTextWith :: Int -> Builder -> Text
singleton :: Char -> Builder
fromText :: Text -> Builder
fromLazyText :: Text -> Builder
flush :: Builder
The Builder type
data Builder

A Builder is an efficient way to build lazy Text values. There are several functions for constructing builders, but only one to inspect them: to extract any data, you have to turn them into lazy Text values using toLazyText.

Internally, a builder constructs a lazy Text by filling arrays piece by piece. As each buffer is filled, it is 'popped' off, to become a new chunk of the resulting lazy Text. All this is hidden from the user of the Builder.

show/hide Instances
toLazyText :: Builder -> Text
O(n). Extract a lazy Text from a Builder with a default buffer size. The construction work takes place if and when the relevant part of the lazy Text is demanded.
toLazyTextWith :: Int -> Builder -> Text

O(n). Extract a lazy Text from a Builder, using the given size for the initial buffer. The construction work takes place if and when the relevant part of the lazy Text is demanded.

If the initial buffer is too small to hold all data, subsequent buffers will be the default buffer size.

Constructing Builders
singleton :: Char -> Builder

O(1). A Builder taking a single character, satisfying

fromText :: Text -> Builder

O(1). A Builder taking a Text, satisfying

fromLazyText :: Text -> Builder

O(1). A Builder taking a lazy Text, satisfying

Flushing the buffer state
flush :: Builder
O(1). Pop the strict Text we have constructed so far, if any, yielding a new chunk in the result lazy Text.
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