Unicode Transforms
Fast Unicode 13.0.0 normalization in Haskell (NFC, NFKC, NFD, NFKD).
What is normalization?
Unicode characters with adornments (e.g. Á) can be represented in two different
forms, as a single composed character (U+00C1 = Á) or as multiple decomposed
characters (U+0041(A) U+0301( ́ ) = Á). They are differently encoded byte
sequences but for humans they have exactly the same visual appearance.
A regular byte comparison may tell that two strings are different even though
they might be equivalent. We need to convert both the strings in a
normalized
form using the Unicode
Character Database before we can
compare them for equivalence. For example:
>> import Data.Text.Normalize
>> normalize NFC "\193" == normalize NFC "\65\769"
True
Performance
Normalization performance comparison of this package (v0.3.7) with
the text-icu package
using the ICU C++ library
version ICU4C 65.1 on macOS. The benchmarks compare the time taken in
milliseconds to normalize files in different languages and normalization
forms using both the packages. In most cases unicode-transforms
outperforms ICU.
Benchmark unicode-transforms(ms) ICU(ms) % Diff
--------------- ---------------------- ------- --------
NFKD/Korean 7.78 37.10 +376.87
NFD/Korean 7.86 37.06 +371.50
NFKD/Vietnamese 6.85 12.48 +82.20
NFKD/Deutsch 2.17 3.55 +63.30
NFKD/English 1.71 2.78 +62.30
NFKC/Korean 4.77 7.65 +60.28
NFD/Deutsch 2.24 3.53 +57.41
NFD/English 1.76 2.77 +57.32
NFC/Vietnamese 10.66 16.63 +56.00
NFKC/Vietnamese 10.95 16.58 +51.43
NFD/Devanagari 6.48 8.68 +34.10
NFC/Devanagari 6.77 8.49 +25.48
NFD/AllChars 6.18 7.41 +19.91
NFD/Japanese 7.80 9.20 +17.99
NFKC/Devanagari 7.33 8.48 +15.74
NFKD/Japanese 8.71 10.05 +15.39
NFD/Vietnamese 5.94 6.83 +14.99
NFKD/Devanagari 7.59 8.68 +14.27
NFKD/AllChars 9.80 10.66 +8.82
NFKC/Deutsch 3.21 3.18 -0.72
NFC/Korean 4.62 4.38 -5.35
NFKC/English 2.21 2.06 -6.88
NFC/English 2.19 2.04 -7.21
NFKC/AllChars 14.67 9.75 -50.51
NFC/Deutsch 3.02 1.95 -54.39
NFKC/Japanese 12.46 5.42 -129.93
NFC/AllChars 9.72 3.58 -171.63
NFC/Japanese 11.90 3.04 -292.04
Talks
Contributing
Please use https://github.com/harendra-kumar/unicode-transforms to raise
issues, or send pull requests.