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"""Unit tests for language_tool_python.utils (classify_matches, correct)."""
from __future__ import annotations
from typing import TYPE_CHECKING
import pytest
from language_tool_python.match import Match, four_byte_char_positions
from language_tool_python.utils import TextStatus, classify_matches, correct
if TYPE_CHECKING:
from language_tool_python._internals.api_types import CheckMatch
def _make_match(
rule_id: str = "RULE",
offset: int = 0,
length: int = 4,
replacements: list[str] | None = None,
) -> Match:
attrib: CheckMatch = {
"message": "Error",
"shortMessage": "",
"replacements": [{"value": r} for r in (replacements or [])],
"offset": offset,
"length": length,
"context": {"text": "text here.", "offset": offset, "length": length},
"sentence": "text here.",
"type": {"typeName": "Other"},
"rule": {
"id": rule_id,
"description": "desc",
"issueType": "misspelling",
"category": {"id": "TYPOS", "name": "Typos"},
},
"ignoreForIncompleteSentence": False,
"contextForSureMatch": 0,
}
return Match(attrib, four_byte_char_positions("text here."))
class TestClassifyMatches:
"""Tests for classify_matches() match-set status classifier."""
def test_no_matches_returns_correct(self) -> None:
"""An empty match list is classified as CORRECT."""
assert classify_matches([]) == TextStatus.CORRECT
def test_matches_with_replacements_returns_faulty(self) -> None:
"""A match that has a replacement is classified as FAULTY."""
m = _make_match(replacements=["fix"])
assert classify_matches([m]) == TextStatus.FAULTY
def test_matches_without_replacements_returns_garbage(self) -> None:
"""A match without any replacement is classified as GARBAGE."""
m = _make_match(replacements=[])
assert classify_matches([m]) == TextStatus.GARBAGE
def test_mixed_filters_to_faulty(self) -> None:
"""A mix of matches with and without replacements is classified as FAULTY."""
m_with = _make_match(replacements=["fix"])
m_without = _make_match(replacements=[])
assert classify_matches([m_with, m_without]) == TextStatus.FAULTY
def test_all_without_replacements_is_garbage(self) -> None:
"""Multiple matches all lacking replacements are classified as GARBAGE."""
matches = [_make_match(replacements=[]) for _ in range(3)]
assert classify_matches(matches) == TextStatus.GARBAGE
class TestCorrect:
"""Tests for correct() auto-correction function."""
def test_no_matches_returns_unchanged(self) -> None:
"""Text with no matches is returned unchanged."""
assert correct("hello world", []) == "hello world"
def test_single_correction(self) -> None:
"""A single match with a replacement is applied to the text."""
m = _make_match(offset=0, length=4, replacements=["text"])
result = correct("text here.", [m])
assert result == "text here."
def test_correction_replaces_error(self) -> None:
"""A misspelled word is replaced by the first suggested correction."""
text = "Helo world"
attrib: CheckMatch = {
"message": "Misspelling",
"shortMessage": "",
"replacements": [{"value": "Hello"}],
"offset": 0,
"length": 4,
"context": {"text": text, "offset": 0, "length": 4},
"sentence": text,
"type": {"typeName": "Other"},
"rule": {
"id": "SPELL",
"description": "Spelling",
"issueType": "misspelling",
"category": {"id": "TYPOS", "name": "Typos"},
},
"ignoreForIncompleteSentence": False,
"contextForSureMatch": 0,
}
m = Match(attrib, four_byte_char_positions(text))
result = correct(text, [m])
assert result == "Hello world"
def test_match_without_replacement_is_skipped(self) -> None:
"""A match with no replacement leaves the text unchanged."""
m = _make_match(offset=0, length=4, replacements=[])
assert correct("text here.", [m]) == "text here."
def test_overlapping_match_skips_mismatched_error(self) -> None:
"""The second of two overlapping matches is skipped when offset drifts."""
# First match replaces "aa" (offset 0, len 2) with "xxxxxx" (longer).
# Second match overlaps at offset 1, len 2 ("ab"). After the first
# replacement expands the text, the second match's expected text no
# longer sits at the right position → continue branch is hit.
text = "aabbc"
attrib1: CheckMatch = {
"message": "e",
"shortMessage": "",
"replacements": [{"value": "xxxxxx"}],
"offset": 0,
"length": 2,
"context": {"text": text, "offset": 0, "length": 2},
"sentence": text,
"type": {"typeName": "Other"},
"rule": {
"id": "R",
"description": "d",
"issueType": "misspelling",
"category": {"id": "C", "name": "C"},
},
"ignoreForIncompleteSentence": False,
"contextForSureMatch": 0,
}
attrib2: CheckMatch = {
"message": "e",
"shortMessage": "",
"replacements": [{"value": "y"}],
"offset": 1,
"length": 2,
"context": {"text": text, "offset": 1, "length": 2},
"sentence": text,
"type": {"typeName": "Other"},
"rule": {
"id": "R",
"description": "d",
"issueType": "misspelling",
"category": {"id": "C", "name": "C"},
},
"ignoreForIncompleteSentence": False,
"contextForSureMatch": 0,
}
positions = four_byte_char_positions(text)
m1 = Match(attrib1, positions)
m2 = Match(attrib2, positions)
result = correct(text, [m1, m2])
assert result == "xxxxxxbbc"
def test_correct_adjusts_offset_for_length_change(self) -> None:
"""A length-changing replacement shifts the offset for subsequent matches."""
text = "A b c"
attrib1: CheckMatch = {
"message": "err",
"shortMessage": "",
"replacements": [{"value": "AAA"}],
"offset": 0,
"length": 1,
"context": {"text": text, "offset": 0, "length": 1},
"sentence": text,
"type": {"typeName": "Other"},
"rule": {
"id": "R",
"description": "d",
"issueType": "misspelling",
"category": {"id": "C", "name": "C"},
},
"ignoreForIncompleteSentence": False,
"contextForSureMatch": 0,
}
attrib2: CheckMatch = {
"message": "err",
"shortMessage": "",
"replacements": [{"value": "BBB"}],
"offset": 2,
"length": 1,
"context": {"text": text, "offset": 2, "length": 1},
"sentence": text,
"type": {"typeName": "Other"},
"rule": {
"id": "R",
"description": "d",
"issueType": "misspelling",
"category": {"id": "C", "name": "C"},
},
"ignoreForIncompleteSentence": False,
"contextForSureMatch": 0,
}
positions = four_byte_char_positions(text)
m1 = Match(attrib1, positions)
m2 = Match(attrib2, positions)
result = correct(text, [m1, m2])
assert result == "AAA BBB c"
@pytest.mark.parametrize(
("status", "value"),
[
(TextStatus.CORRECT, "correct"),
(TextStatus.FAULTY, "faulty"),
(TextStatus.GARBAGE, "garbage"),
],
)
def test_text_status_values(status: TextStatus, value: str) -> None:
"""TextStatus enum values match expected strings."""
assert status.value == value