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Description:

reynircorrect 4.0.0

GreynirCorrect: Spelling and grammar correction for Icelandic

Overview
GreynirCorrect is a Python 3 (>= 3.8) package and command line tool for
checking and correcting spelling and grammar in Icelandic text.
GreynirCorrect relies on the Greynir package,
by the same authors, to tokenize and parse text.
GreynirCorrect is documented in detail here.
The software has three main modes of operation, described below.
As a fourth alternative, you can call the JSON REST API
of Yfirlestur.is
to apply the GreynirCorrect spelling and grammar engine to your text,
as documented here.

Token-level correction
GreynirCorrect can tokenize text and return an automatically corrected token stream.
This catches token-level errors, such as spelling errors and erroneous
phrases, but not grammatical errors. Token-level correction is relatively fast.

Full grammar analysis
GreynirCorrect can analyze text grammatically by attempting to parse
it, after token-level correction. The parsing is done according to Greynir’s
context-free grammar for Icelandic, augmented with additional production
rules for common grammatical errors. The analysis returns a set of annotations
(errors and suggestions) that apply to spans (consecutive tokens) within
sentences in the resulting token list. Full grammar analysis is considerably
slower than token-level correction.

Command-line tool
GreynirCorrect can be invoked as a command-line tool
to perform token-level correction and, optionally, grammar analysis.
The command is correct infile.txt outfile.txt.
The command-line tool is further documented below.

Examples
To perform token-level correction from Python code:
>>> from reynir_correct import tokenize
>>> g = tokenize("Af gefnu tilefni fékk fékk daninn vilja sýnum "
>>> "framgengt í auknu mæli.")
>>> for tok in g:
>>> print("{0:10} {1}".format(tok.txt or "", tok.error_description))
Output:
Að Orðasambandið 'Af gefnu tilefni' var leiðrétt í 'að gefnu tilefni'
gefnu
tilefni
fékk Endurtekið orð ('fékk') var fellt burt
Daninn Orð á að byrja á hástaf: 'daninn'
vilja Orðasambandið 'vilja sýnum framgengt' var leiðrétt í 'vilja sínum framgengt'
sínum
framgengt
í Orðasambandið 'í auknu mæli' var leiðrétt í 'í auknum mæli'
auknum
mæli
.
To perform full spelling and grammar analysis of a sentence from Python code:
from reynir_correct import check_single
sent = check_single("Páli, vini mínum, langaði að horfa á sjónnvarpið.")
for annotation in sent.annotations:
print("{0}".format(annotation))
Output:
000-004: P_WRONG_CASE_þgf_þf Á líklega að vera 'Pál, vin minn' / [Pál , vin minn]
009-009: S004 Orðið 'sjónnvarpið' var leiðrétt í 'sjónvarpið'
sent.tidy_text
Output:
'Páli, vini mínum, langaði að horfa á sjónvarpið.'
The annotation.start and annotation.end properties
(here start is 0 and end is 4) contain the 0-based indices of the first
and last tokens to which the annotation applies.
The annotation.start_char and annotation.end_char properties
contain the indices of the first and last character to which the
annotation applies, within the original input string.
P_WRONG_CASE_þgf_þf and S004 are error codes.
For more detailed, low-level control, the check_errors() function
supports options and can produce various types of output:
from reynir_correct import check_errors
x = "Páli, vini mínum, langaði að horfa á sjónnvarpið."
options = { "input": x, "annotations": True, "format": "text" }
s = check_errors(**options)
for i in s.split("\n"):
print(i)
Output:
Pál, vin minn, langaði að horfa á sjónvarpið.
000-004: P_WRONG_CASE_þgf_þf Á líklega að vera 'Pál, vin minn' | 'Páli, vini mínum,' -> 'Pál, vin minn' | None
009-009: S004 Orðið 'sjónnvarpið' var leiðrétt í 'sjónvarpið' | 'sjónnvarpið' -> 'sjónvarpið' | None
The following options can be specified:

Option

Description
Default value

input

Defines the input. Can be a string or an
iterable of strings, such as a file object.
sys.stdin

all_errors
(alias grammar)

Defines the level of correction.
If False, only token-level annotation is
carried out. If True, sentence-level
annotation is carried out.
True

annotate_unparsed_sentences

If True, sentences that cannot be parsed
are annotated in their entirety as errors.
True

generate_suggestion_list

If True, annotations can in certain
cases contain a list of possible corrections,
for the user to pick from.
False

suppress_suggestions

If True, more farfetched automatically
suggested corrections are suppressed.
False

ignore_wordlist

The value is a set of strings to whitelist.
Each string is a word that should not be
marked as an error or corrected. The comparison
is case-sensitive.
set()

one_sent

The input contains a single sentence only.
Sentence splitting should not be attempted.
False

ignore_rules

A set of error codes that should be ignored
in the annotation process.
set()

tov_config

Path to an additional configuration file that
may be provided for correcting custom
tone-of-voice issues.
False

An overview of error codes is available here.

Prerequisites
GreynirCorrect runs on CPython 3.8 or newer, and on PyPy 3.8 or newer. It has
been tested on Linux, macOS and Windows. The
PyPi package
includes binary wheels for common environments, but if the setup on your OS
requires compilation from sources, you may need
$ sudo apt-get install python3-dev
…or something to similar effect to enable this.

Installation
To install this package (assuming you have Python >= 3.8 with pip installed):
$ pip install reynir-correct
If you want to be able to edit the source, do like so
(assuming you have git installed):
$ git clone https://github.com/mideind/GreynirCorrect
$ cd GreynirCorrect
$ # [ Activate your virtualenv here if you have one ]
$ pip install -e .
The package source code is now in GreynirCorrect/src/reynir_correct.

The command line tool
After installation, the corrector can be invoked directly from the command line:
$ correct input.txt output.txt
…or:
$ echo "Þinngið samþikkti tilöguna" | correct
Þingið samþykkti tillöguna
Input and output files are encoded in UTF-8. If the files are not
given explicitly, stdin and stdout are used for input and output,
respectively.
Empty lines in the input are treated as sentence boundaries.
By default, the output consists of one sentence per line, where each
line ends with a single newline character (ASCII LF, chr(10), "\n").
Within each line, tokens are separated by spaces.
The following (mutually exclusive) options can be specified
on the command line:

--csv

Output token objects in CSV
format, one per line. Sentences are separated by
lines containing 0,"",""

--json

Output token objects in JSON format, one per line.

--normalize

Normalize punctuation, causing e.g. quotes to be
output in Icelandic form and hyphens to be
regularized.

--grammar

Output whole-sentence annotations, including
corrections and suggestions for spelling and
grammar. Each sentence in the input is output as
a text line containing a JSON object, terminated
by a newline.

The CSV and JSON formats of token objects are identical to those documented
for the Tokenizer package.
The JSON format of whole-sentence annotations is identical to the one documented for
the Yfirlestur.is HTTPS REST API.
Type correct -h to get a short help message.

Command Line Examples
$ echo "Atvinuleysi jógst um 3%" | correct
Atvinnuleysi jókst um 3%
$ echo "Barnið vil grænann lit" | correct --csv
6,"Barnið",""
6,"vil",""
6,"grænan",""
6,"lit",""
0,"",""
Note how vil is not corrected, as it is a valid and common word, and
the correct command does not perform grammar checking by default.
$ echo "Pakkin er fyrir hestin" | correct --json
{"k":"BEGIN SENT"}
{"k":"WORD","t":"Pakkinn"}
{"k":"WORD","t":"er"}
{"k":"WORD","t":"fyrir"}
{"k":"WORD","t":"hestinn"}
{"k":"END SENT"}
To perform whole-sentence grammar checking and annotation as well as spell checking,
use the --grammar option:
$ echo "Ég kláraði verkefnið þrátt fyrir að ég var þreittur." | correct --grammar
{
"original":"Ég kláraði verkefnið þrátt fyrir að ég var þreittur.",
"corrected":"Ég kláraði verkefnið þrátt fyrir að ég var þreyttur.",
"tokens":[
{"k":6,"x":"Ég","o":"Ég"},
{"k":6,"x":"kláraði","o":" kláraði"},
{"k":6,"x":"verkefnið","o":" verkefnið"},
{"k":6,"x":"þrátt fyrir","o":" þrátt fyrir"},
{"k":6,"x":"að","o":" að"},
{"k":6,"x":"ég","o":" ég"},
{"k":6,"x":"var","o":" var"},
{"k":6,"x":"þreyttur","o":" þreittur"},
{"k":1,"x":".","o":"."}
],
"annotations":[
{
"start":6,
"end":6,
"start_char":35,
"end_char":37,
"code":"P_MOOD_ACK",
"text":"Hér er réttara að nota viðtengingarhátt
sagnarinnar 'vera', þ.e. 'væri'.",
"detail":"Í viðurkenningarsetningum á borð við 'Z'
í dæminu 'X gerði Y þrátt fyrir að Z' á sögnin að vera
í viðtengingarhætti fremur en framsöguhætti.",
"suggest":"væri"
},
{
"start":7,
"end":7,
"start_char":38,
"end_char":41,
"code":"S004",
"text":"Orðið 'þreittur' var leiðrétt í 'þreyttur'",
"detail":"",
"suggest":"þreyttur"
}
]
}
The output has been formatted for legibility - each input sentence is actually
represented by a JSON object in a single line of text, terminated by newline.
Note that the corrected field only includes token-level spelling correction
(in this case þreittur -> þreyttur), but no grammar corrections.
The grammar corrections are found in the annotations list.
To apply corrections and suggestions from the annotations,
replace source text or tokens (as identified by the start and end,
or start_char and end_char properties) with the suggest field, if present.

Tests
To run the built-in tests, install pytest,
cd to your GreynirCorrect subdirectory (and optionally activate your
virtualenv), then run:
$ python -m pytest

Acknowledgements
Parts of this software are developed under the auspices of the
Icelandic Government’s 5-year Language Technology Programme for Icelandic,
which is managed by Almannarómur and described
here
(English version here).

Copyright and License

Copyright © 2023 Miðeind ehf.
GreynirCorrect’s original author is Vilhjálmur Þorsteinsson.
This software is licensed under the MIT License:

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the “Software”), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

GreynirCorrect indirectly embeds the Database of Icelandic Morphology
(Beygingarlýsing íslensks nútímamáls), abbreviated BÍN,
along with directly using
Ritmyndir,
a collection of non-standard word forms.
Miðeind does not claim any endorsement by the BÍN authors or copyright holders.
The BÍN source data are publicly available under the
CC BY-SA 4.0 license, as further
detailed here in English
and here in Icelandic.
In accordance with the BÍN license terms, credit is hereby given as follows:
Beygingarlýsing íslensks nútímamáls. Stofnun Árna Magnússonar í íslenskum fræðum.
Höfundur og ritstjóri Kristín Bjarnadóttir.