Implement text reference resolution for backend

.dockerignore

@@ -40,6 +40,7 @@ coverage.xml
 *.py,cover
 .hypothesis/
 .pytest_cache/
+.mypy_cache/
 cover/
 
 

.gitignore

@@ -35,6 +35,7 @@ coverage.xml
 .hypothesis/
 .pytest_cache/
 cover/
+.mypy_cache/
 
 
 # Django

.vscode/settings.json

@@ -1,4 +1,8 @@
 {
+	"search.exclude": {
+    ".mypy_cache/": true,
+    ".pytest_cache/": true
+	},
 	"python.testing.unittestArgs": [
 		"-v",
 		"-s",
@@ -14,5 +18,16 @@
 		}
 	],
 	"python.linting.enabled": true,
-	"python.linting.mypyEnabled": true
+	"python.linting.mypyEnabled": true,
+	"python.analysis.typeCheckingMode": "off",
+	"python.analysis.diagnosticSeverityOverrides": {
+		// "reportOptionalMemberAccess": "none"
+	},
+	"python.analysis.ignore": ["**/tests/**", "**/node_modules/**", "**/venv/**"],
+	"python.analysis.packageIndexDepths": [
+    {
+        "name": "django",
+        "depth": 5
+    }
+	]
 }

README.md

@@ -70,6 +70,8 @@ This readme file is used mostly to document project dependencies
   - gunicorn
   - coreapi
   - psycopg2-binary
+  - pymorphy2
+  - razdel
   </pre>
 </details>
 <details>
@@ -87,6 +89,7 @@ This readme file is used mostly to document project dependencies
   <pre>
   - Pylance
   - Pylint
+  - Django
   </pre>
 </details>
 

rsconcept/backend/apps/rsform/tests/__init__.py

@@ -1,5 +1,4 @@
 ''' Tests. '''
-# flake8: noqa
 from .t_imports import *
 from .t_views import *
 from .t_models import *

rsconcept/backend/apps/rsform/utils.py

@@ -8,13 +8,21 @@ from rest_framework.permissions import BasePermission
 class ObjectOwnerOrAdmin(BasePermission):
     ''' Permission for object ownership restriction '''
     def has_object_permission(self, request, view, obj):
-        return request.user == obj.owner or request.user.is_staff
+        if request.user == obj.owner:
+            return True
+        if not hasattr(request.user, 'is_staff'):
+            return False
+        return request.user.is_staff # type: ignore
 
 
 class SchemaOwnerOrAdmin(BasePermission):
     ''' Permission for object ownership restriction '''
     def has_object_permission(self, request, view, obj):
-        return request.user == obj.schema.owner or request.user.is_staff
+        if request.user == obj.schema.owner:
+            return True
+        if not hasattr(request.user, 'is_staff'):
+            return False
+        return request.user.is_staff # type: ignore
 
 
 def read_trs(file) -> dict:

rsconcept/backend/cctext/__init__.py

@@ -1,14 +1,16 @@
 ''' Concept core text processing library. '''
 # pylint: skip-file
 from .syntax import RuSyntax, Capitalization
-from .rumodel import Morphology, SemanticRole, WordTag, morpho
+from .rumodel import Morphology, SemanticRole, WordTag, morpho, split_tags, combine_tags
 from .ruparser import PhraseParser, WordToken, Collation
+from .reference import EntityReference, ReferenceType, SyntacticReference, parse_reference
+from .context import TermForm, Entity, TermContext
+from .resolver import Position, Resolver, ResolvedReference, resolve_entity, resolve_syntactic
 
 from .conceptapi import (
     parse, normalize,
     get_all_forms, inflect, inflect_context, inflect_substitute, inflect_dependant,
-    match_all_morpho, find_substr,
-    split_tags
+    match_all_morpho, find_substr
 )
 
 # TODO: implement Part of speech transition for VERB <-> NOUN

rsconcept/backend/cctext/conceptapi.py

@@ -1,27 +1,23 @@
 '''
 Concept API Python functions.
 
-::guarantee:: doesnt raise exceptions and returns workable outputs in situations where empty string would be returned
+::guarantee:: doesnt raise exceptions and returns workable outputs
 '''
 from cctext.rumodel import Morphology
 from .syntax import RuSyntax
 from .ruparser import PhraseParser
+from .rumodel import split_tags
 
 parser = PhraseParser()
 
 
-def split_tags(tags: str) -> frozenset[str]:
-    ''' Split grammemes string into set of items. '''
-    return frozenset([tag.strip() for tag in filter(None, tags.split(','))])
-
-
 def parse(text: str, require_tags: str = '') -> str:
     ''' Determine morpho tags for input text.
     ::returns:: string of comma separated grammar tags or empty string '''
     model = parser.parse(text, require_tags=split_tags(require_tags))
     if model is None:
         return ''
-    result = model.get_morpho().as_str()
+    result = model.get_morpho().to_text()
     return result if result != 'UNKN' else ''
 
 
@@ -32,7 +28,7 @@ def get_all_forms(text_normal: str) -> list[tuple[str, str]]:
         return []
     result = []
     for form in model.get_form().lexeme:
-        result.append((form.word, Morphology(form.tag).as_str()))
+        result.append((form.word, Morphology(form.tag).to_text()))
     return result
 
 

rsconcept/backend/cctext/context.py

@@ -0,0 +1,62 @@
+''' Term context for reference resolution. '''
+from typing import Iterable, Dict, Optional
+from dataclasses import dataclass
+
+from .conceptapi import inflect
+
+
+@dataclass
+class TermForm:
+    ''' Term in a specific form. '''
+    text: str
+    form: str
+
+
+def _search_form(query: str, data: Iterable[TermForm]) -> Optional[str]:
+    for tf in data:
+        if tf.form == query:
+            return tf.text
+    return None
+
+
+class Entity:
+    ''' Text entity. '''
+    def __init__(self, alias: str, nominal: str, manual_forms: Optional[Iterable[TermForm]]=None):
+        if manual_forms is None:
+            self.manual = []
+        else:
+            self.manual = list(manual_forms)
+        self.alias = alias
+        self._nominal = nominal
+        self._cached: list[TermForm] = []
+
+    def get_nominal(self) -> str:
+        ''' Getter for _nominal. '''
+        return self._nominal
+
+    def set_nominal(self, new_text: str):
+        ''' Setter for _nominal.
+            Note: clears manual and cached forms. '''
+        if self._nominal == new_text:
+            return
+        self._nominal = new_text
+        self.manual = []
+        self._cached = []
+
+    def get_form(self, form: str) -> str:
+        ''' Get specific term form. '''
+        if form == '':
+            return self._nominal
+        text = _search_form(form, self.manual)
+        if text is None:
+            text = _search_form(form, self._cached)
+            if text is None:
+                try:
+                    text = inflect(self._nominal, form)
+                except ValueError as error:
+                    text = f'!{error}!'.replace('Unknown grammeme', 'Неизвестная граммема')
+                self._cached.append(TermForm(text=text, form=form))
+        return text
+
+# Term context for resolving entity references.
+TermContext = Dict[str, Entity]

rsconcept/backend/cctext/reference.py

@@ -0,0 +1,60 @@
+''' Text reference API. '''
+from enum import Enum, unique
+from typing import Optional, Union
+
+
+@unique
+class ReferenceType(Enum):
+    ''' Text reference types. '''
+    entity = 'entity'
+    syntactic = 'syntax'
+
+
+class EntityReference:
+    ''' Reference to entity. '''
+
+    def __init__(self, identifier: str, form: str):
+        self.entity = identifier
+        self.form = form
+
+    def get_type(self) -> ReferenceType:
+        return ReferenceType.entity
+
+    def to_text(self) -> str:
+        return f'@{{{self.entity}|{self.form}}}'
+
+
+class SyntacticReference:
+    ''' Reference to syntactic dependcy on EntityReference. '''
+
+    def __init__(self, referal_offset: int, text: str):
+        self.nominal = text
+        self.offset = referal_offset
+
+    def get_type(self) -> ReferenceType:
+        return ReferenceType.syntactic
+
+    def to_text(self) -> str:
+        return f'@{{{self.offset}|{self.nominal}}}'
+
+
+Reference = Union[EntityReference, SyntacticReference]
+
+
+def parse_reference(text: str) -> Optional[Reference]:
+    if len(text) < 4 or text[-1] != '}' or text[0:2] != '@{':
+        return None
+    blocks: list[str] = [block.strip() for block in text[2:-1].split('|')]
+    if len(blocks) != 2 or blocks[0] == '' or blocks[0][0] in '0':
+        return None
+    if blocks[0][0] in '-123456789':
+        if blocks[1] == '':
+            return None
+        try:
+            offset = int(blocks[0])
+            return SyntacticReference(offset, blocks[1])
+        except ValueError:
+            return None
+    else:
+        form = blocks[1].replace(' ', '')
+        return EntityReference(blocks[0], form)

rsconcept/backend/cctext/resolver.py

@@ -0,0 +1,114 @@
+''' Reference resolution API. '''
+import re
+from typing import cast, Optional
+from dataclasses import dataclass
+
+from .conceptapi import inflect_dependant
+from .context import TermContext
+from .reference import EntityReference, SyntacticReference, parse_reference, Reference
+
+
+def resolve_entity(ref: EntityReference, context: TermContext) -> str:
+    ''' Resolve entity reference. '''
+    alias = ref.entity
+    if alias not in context:
+        return f'!Неизвестная сущность: {alias}!'
+    return context[alias].get_form(ref.form)
+
+
+def resolve_syntactic(ref: SyntacticReference, index: int, allrefs: list['ResolvedReference']) -> str:
+    ''' Resolve syntactic reference. '''
+    offset = ref.offset
+    mainref: Optional['ResolvedReference'] = None
+    if offset > 0:
+        index += 1
+        while index < len(allrefs):
+            if isinstance(allrefs[index].ref, EntityReference):
+                if offset == 1:
+                    mainref = allrefs[index]
+                else:
+                    offset -= 1
+            index += 1
+    else:
+        index -= 1
+        while index >= 0:
+            if isinstance(allrefs[index].ref, EntityReference):
+                if offset == -1:
+                    mainref = allrefs[index]
+                else:
+                    offset += 1
+            index -= 1
+    if mainref is None:
+        return f'!Некорректное смещение: {ref.offset}!'
+    return inflect_dependant(ref.nominal, mainref.resolved)
+
+
+@dataclass
+class Position:
+    ''' 0-indexed contiguous segment position in text. '''
+    start: int = 0
+    finish: int = 0
+
+
+@dataclass
+class ResolvedReference:
+    ''' Resolved reference data '''
+    ref: Reference
+    resolved: str = ''
+    pos_input: Position = Position()
+    pos_output: Position = Position()
+
+
+class Resolver:
+    ''' Text reference resolver '''
+    REFERENCE_PATTERN = re.compile(r'@{.*?}')
+
+    def __init__(self, context: TermContext):
+        self.context = context
+        self.refs = cast(list[ResolvedReference], [])
+        self.input = ''
+        self.output = ''
+
+    def resolve(self, text: str) -> str:
+        ''' Resolve references in input text.
+            Note: data on references positions is accessed through class attributes '''
+        self._reset(text)
+        self._parse_refs()
+        if len(self.refs) == 0:
+            self.output = self.input
+            return self.output
+        else:
+            self._resolve_refs()
+            self._combine_output()
+            return self.output
+
+    def _reset(self, input_text: str):
+        self.refs = cast(list[ResolvedReference], [])
+        self.input = input_text
+        self.output = ''
+
+    def _parse_refs(self):
+        for segment in re.finditer(Resolver.REFERENCE_PATTERN, self.input):
+            parse = parse_reference(segment[0])
+            if parse is not None:
+                ref_info = ResolvedReference(ref=parse,
+                                             resolved='',
+                                             pos_input=Position(segment.start(0), segment.end(0)))
+                self.refs.append(ref_info)
+
+    def _resolve_refs(self):
+        for ref in self.refs:
+            if isinstance(ref.ref, EntityReference):
+                ref.resolved = resolve_entity(ref.ref, self.context)
+        for (index, ref) in enumerate(self.refs):
+            if isinstance(ref.ref, SyntacticReference):
+                ref.resolved = resolve_syntactic(ref.ref, index, self.refs)
+
+    def _combine_output(self):
+        pos_in = 0
+        for ref in self.refs:
+            self.output += self.input[pos_in : ref.pos_input.start]
+            self.output += ref.resolved
+            ref.pos_output = Position(len(self.output) - len(ref.resolved), len(self.output))
+            pos_in = ref.pos_input.finish
+        self.output += self.input[pos_in : len(self.input)]

rsconcept/backend/cctext/rumodel.py

@@ -1,7 +1,7 @@
 ''' Russian language models. '''
 from __future__ import annotations
 from enum import Enum, unique
-from typing import Iterable
+from typing import Iterable, Optional
 
 from pymorphy2 import MorphAnalyzer
 from pymorphy2.tagset import OpencorporaTag as WordTag
@@ -10,6 +10,16 @@ from pymorphy2.tagset import OpencorporaTag as WordTag
 morpho = MorphAnalyzer()
 
 
+def split_tags(text: str) -> list[str]:
+    ''' Split grammemes string into set of items. '''
+    return [tag.strip() for tag in filter(None, text.split(','))]
+
+
+def combine_tags(tags: Iterable[str]) -> str:
+    ''' Combine grammemes into string. '''
+    return ','.join(tags)
+
+
 @unique
 class SemanticRole(Enum):
     ''' Enumerating semantic types for different parse patterns. '''
@@ -19,8 +29,8 @@ class SemanticRole(Enum):
     definition = 3
 
     @staticmethod
-    def from_pos(pos: str) -> SemanticRole:
-        ''' Fabric method to produce types from part of speech. '''
+    def from_POS(pos: Optional[str]) -> SemanticRole:
+        ''' Production method: types from part of speech. '''
         if pos in ['NOUN', 'NPRO']:
             return SemanticRole.term
         elif pos in ['VERB', 'INFN', 'PRTF', 'PRTS']:
@@ -36,10 +46,7 @@ class Morphology:
     '''
     def __init__(self, tag: WordTag, semantic=SemanticRole.unknwn):
         self.tag = tag
-        self.semantic = semantic if semantic != SemanticRole.unknwn else SemanticRole.from_pos(tag.POS)
-
-    def __del__(self):
-        pass
+        self.semantic = semantic if semantic != SemanticRole.unknwn else SemanticRole.from_POS(tag.POS)
 
     _TAGS_IMMUTABLE = frozenset(['INFN', 'ADVB', 'COMP', 'PNCT', 'PREP', 'CONJ', 'PRCL', 'INTJ'])
 
@@ -60,9 +67,9 @@ class Morphology:
         return pos in ['ADJF', 'ADJS', 'PRTF', 'PRTS']
 
     @property
-    def effective_POS(self) -> str:
+    def effective_POS(self) -> Optional[str]:
         ''' Access part of speech. Pronouns are considered as nouns '''
-        pos: str = self.tag.POS
+        pos: Optional[str] = self.tag.POS
         if pos and self.tag.POS == 'NPRO':
             return 'NOUN'
         return pos
@@ -105,14 +112,6 @@ class Morphology:
             result.add(self.tag.gender)
         return result
 
-    def as_str(self) -> str:
+    def to_text(self) -> str:
         ''' Produce string of all grammemes. '''
-        grammemes = self.tag.grammemes
-        count = len(grammemes)
-        if count == 0:
-            return ''
-        elif count == 1:
-            result: str = next(iter(grammemes))
-            return result
-        else:
-            return ','.join(grammemes)
+        return combine_tags(self.tag.grammemes)

rsconcept/backend/cctext/ruparser.py

@@ -381,7 +381,7 @@ class PhraseParser:
             case = form.tag.case
             if pos not in ['ADJF', 'ADJS', 'PRTF', 'PRTS']:
                 continue
-            if SemanticRole.from_pos(pos) == SemanticRole.term and case == 'gent':
+            if SemanticRole.from_POS(pos) == SemanticRole.term and case == 'gent':
                 if before_main:
                     continue
                 else:

rsconcept/backend/cctext/tests/__init__.py

@@ -1 +1,8 @@
 ''' Tests. '''
+from .t_reference import *
+from .t_ruparser import *
+from .t_syntax import *
+from .t_conceptapi import *
+from .t_rumodel import *
+from .t_context import *
+from .t_resolver import *

rsconcept/backend/cctext/tests/t_conceptapi.py

@@ -1,4 +1,4 @@
-'''Test Concept Text API'''
+''' Unit tests: conceptapi. '''
 import unittest
 
 import cctext as cc
@@ -7,12 +7,12 @@ import cctext as cc
 class TestConceptAPI(unittest.TestCase):
     '''Test class for Concept API.'''
     def _assert_tags(self, actual: str, expected: str):
-        self.assertEqual(cc.split_tags(actual), cc.split_tags(expected))
+        self.assertEqual(set(cc.split_tags(actual)), set(cc.split_tags(expected)))
         
     def test_parse(self):
         ''' Test parsing. '''
         self._assert_tags(cc.parse(''), '')
-        self._assert_tags(cc.parse('1'), 'intg,NUMB')
+        self._assert_tags(cc.parse('1'), 'NUMB,intg')
         self._assert_tags(cc.parse('слон', require_tags='masc'), 'NOUN,anim,masc,sing,nomn')
 
     def test_normalize_word(self):

rsconcept/backend/cctext/tests/t_context.py

@@ -0,0 +1,32 @@
+''' Unit tests: context. '''
+import unittest
+
+from cctext.context import TermForm, Entity, TermContext
+
+class TestEntity(unittest.TestCase):
+    '''Test Entity termform access.'''
+    def setUp(self):
+        self.alias = 'X1'
+        self.nominal = 'человек'
+        self.text1 = 'test1'
+        self.form1 = 'sing,datv'
+        self.entity = Entity(self.alias, self.nominal, [TermForm(self.text1, self.form1)])
+
+    def test_attributes(self):
+        self.assertEqual(self.entity.alias, self.alias)
+        self.assertEqual(self.entity.get_nominal(), self.nominal)
+        self.assertEqual(self.entity.manual, [TermForm(self.text1, self.form1)])
+
+    def test_get_form(self):
+        self.assertEqual(self.entity.get_form(''), self.nominal)
+        self.assertEqual(self.entity.get_form(self.form1), self.text1)
+        self.assertEqual(self.entity.get_form('invalid tags'), '!Неизвестная граммема: invalid tags!')
+        self.assertEqual(self.entity.get_form('plur'), 'люди')
+
+    def test_set_nominal(self):
+        new_nomial = 'TEST'
+        self.assertEqual(self.entity.get_form('plur'), 'люди')
+        self.entity.set_nominal(new_nomial)
+        self.assertEqual(self.entity.get_nominal(), new_nomial)
+        self.assertEqual(self.entity.get_form('plur'), new_nomial)
+        self.assertEqual(self.entity.manual, [])

rsconcept/backend/cctext/tests/t_reference.py

@@ -0,0 +1,43 @@
+''' Unit tests: reference. '''
+import unittest
+
+from cctext import EntityReference, ReferenceType, SyntacticReference, parse_reference
+
+class TestReferences(unittest.TestCase):
+    ''' Test class for references. '''
+
+    def test_EntityReference(self):
+        ''' Testing EntityRefence basics. '''
+        ref = EntityReference('X1', 'sing,nomn')
+        self.assertEqual(ref.get_type(), ReferenceType.entity)
+        self.assertEqual(ref.to_text(), '@{X1|sing,nomn}')
+
+    def test_SyntacticReference(self):
+        ''' Testing SyntacticReference basics. '''
+        ref = SyntacticReference(-1, 'черный')
+        self.assertEqual(ref.get_type(), ReferenceType.syntactic)
+        self.assertEqual(ref.to_text(), '@{-1|черный}')
+
+    def test_parse_reference_invalid(self):
+        ''' Testing parsing reference invalid input. '''
+        self.assertIsNone(parse_reference(''))
+        self.assertIsNone(parse_reference('X1'))
+        self.assertIsNone(parse_reference('invalid'))
+        self.assertIsNone(parse_reference(' '))
+        self.assertIsNone(parse_reference('@{|}'))
+        self.assertIsNone(parse_reference('@{ | }'))
+        self.assertIsNone(parse_reference('@{-1| }'))
+        self.assertIsNone(parse_reference('@{1| }'))
+        self.assertIsNone(parse_reference('@{0|черный}'))
+
+    def test_parse_reference(self):
+        ''' Testing parsing reference text. '''
+        ref = parse_reference('@{1| черный }')
+        self.assertIsNotNone(ref)
+        self.assertEqual(ref.to_text(), '@{1|черный}')        
+        self.assertEqual(ref.get_type(), ReferenceType.syntactic)
+
+        ref = parse_reference('@{X1 | VERB, past, sing}')
+        self.assertIsNotNone(ref)
+        self.assertEqual(ref.to_text(), '@{X1|VERB,past,sing}')        
+        self.assertEqual(ref.get_type(), ReferenceType.entity)

rsconcept/backend/cctext/tests/t_resolver.py

@@ -0,0 +1,76 @@
+''' Unit tests: resolver. '''
+import unittest
+from typing import cast
+
+from cctext import (
+    EntityReference, TermContext, Entity, SyntacticReference,
+    Resolver, ResolvedReference, Position,
+    resolve_entity, resolve_syntactic
+)
+
+class TestResolver(unittest.TestCase):
+    '''Test reference Resolver.'''
+    def setUp(self):
+        self.context = cast(TermContext, {})
+        self.context['X1'] = Entity('X1', 'человек')
+        self.resolver = Resolver(self.context)
+
+    def test_resolve_entity(self):
+        self.assertEqual(resolve_entity(EntityReference('X1', ''), self.context), 'человек')
+        self.assertEqual(resolve_entity(EntityReference('X1', 'plur'), self.context), 'люди')
+        self.assertEqual(resolve_entity(EntityReference('X1', 'invalid'), self.context), '!Неизвестная граммема: invalid!')
+        self.assertEqual(resolve_entity(EntityReference('X123', 'plur'), self.context), '!Неизвестная сущность: X123!')
+
+    def test_resolve_syntactic(self):
+        ref = ResolvedReference(ref=EntityReference('X1', 'sing,datv'), resolved='человеку')
+        allrefs = [ref, ref, ref, ref]
+        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=-1), 0, allrefs), '!Некорректное смещение: -1!')
+        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=1), 3, allrefs), '!Некорректное смещение: 1!')
+        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=1), 0, allrefs), 'умному')
+        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=2), 0, allrefs), 'умному')
+        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=3), 0, allrefs), 'умному')
+        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=-1), 3, allrefs), 'умному')
+        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=-2), 3, allrefs), 'умному')
+        self.assertEqual(resolve_syntactic(SyntacticReference(text='умный', referal_offset=-3), 3, allrefs), 'умному')
+
+    def test_resolve_invalid(self):
+        self.assertEqual(self.resolver.resolve(''), '')
+        self.assertEqual(len(self.resolver.refs), 0)
+
+        self.assertEqual(self.resolver.resolve('simple text'), 'simple text')
+        self.assertEqual(len(self.resolver.refs), 0)
+
+        self.assertEqual(self.resolver.resolve('simple @{unparsable ref} text'), 'simple @{unparsable ref} text')
+        self.assertEqual(len(self.resolver.refs), 0)
+
+    def test_resolve_single(self):
+        self.assertEqual(self.resolver.resolve('просто @{-1|умный} текст'), 'просто !Некорректное смещение: -1! текст')
+        self.assertEqual(len(self.resolver.refs), 1)
+        self.assertEqual(self.resolver.refs[0].pos_input, Position(7, 18))
+        self.assertEqual(self.resolver.refs[0].pos_output, Position(7, 34))
+
+        self.assertEqual(self.resolver.resolve('просто @{X123|sing,nomn} текст'), 'просто !Неизвестная сущность: X123! текст')
+        self.assertEqual(len(self.resolver.refs), 1)
+        self.assertEqual(self.resolver.refs[0].pos_input, Position(7, 24))
+        self.assertEqual(self.resolver.refs[0].pos_output, Position(7, 35))
+
+        self.assertEqual(self.resolver.resolve('@{X1|sing,nomn}'), 'человек')
+        self.assertEqual(len(self.resolver.refs), 1)
+        self.assertEqual(self.resolver.refs[0].pos_input, Position(0, 15))
+        self.assertEqual(self.resolver.refs[0].pos_output, Position(0, 7))
+
+        self.assertEqual(self.resolver.resolve('просто @{X1|sing,nomn} текст'), 'просто человек текст')
+        self.assertEqual(len(self.resolver.refs), 1)
+        self.assertEqual(self.resolver.refs[0].pos_input, Position(7, 22))
+        self.assertEqual(self.resolver.refs[0].pos_output, Position(7, 14))
+
+    def test_resolve_multiple(self):
+        input =  '@{X1|sing,datv} @{-1|умный} @{X1|plur} завидуют'
+        self.assertEqual(self.resolver.resolve(input), 'человеку умному люди завидуют')
+        self.assertEqual(len(self.resolver.refs), 3)
+        self.assertEqual(self.resolver.refs[0].pos_input, Position(0, 15))
+        self.assertEqual(self.resolver.refs[0].pos_output, Position(0, 8))
+        self.assertEqual(self.resolver.refs[1].pos_input, Position(16, 27))
+        self.assertEqual(self.resolver.refs[1].pos_output, Position(9, 15))
+        self.assertEqual(self.resolver.refs[2].pos_input, Position(28, 38))
+        self.assertEqual(self.resolver.refs[2].pos_output, Position(16, 20))

rsconcept/backend/cctext/tests/t_rumodel.py

@@ -0,0 +1,18 @@
+''' Unit tests: rumodel. '''
+import unittest
+
+from cctext import split_tags, combine_tags
+
+
+class TestTags(unittest.TestCase):
+    '''Test tags manipulation.'''
+
+    def test_split_tags(self):
+        self.assertEqual(split_tags(''), [])
+        self.assertEqual(split_tags('NOUN'), ['NOUN'])
+        self.assertEqual(split_tags('NOUN,plur,sing'), ['NOUN','plur','sing'])
+
+    def test_combine_tags(self):
+        self.assertEqual(combine_tags([]), '')
+        self.assertEqual(combine_tags(['NOUN']), 'NOUN')
+        self.assertEqual(combine_tags(['NOUN','plur','sing']), 'NOUN,plur,sing')

rsconcept/backend/cctext/tests/t_ruparser.py

@@ -1,4 +1,4 @@
-''' Test russian language parsing. '''
+''' Unit tests: ruparser. '''
 import unittest
 
 from typing import Iterable, Optional
@@ -10,7 +10,7 @@ parser = PhraseParser()
 class TestRuParser(unittest.TestCase):
     ''' Test class for russian parsing. '''
 
-    def _assert_parse(self, text: str, expected: list[str],
+    def _assert_parse(self, text: str, expected: Iterable[str],
                       require_index: int = -1,
                       require_tags: Optional[Iterable[str]] = None):
         phrase = parser.parse(text, require_index, require_tags)

rsconcept/backend/cctext/tests/t_syntax.py

@@ -1,10 +1,10 @@
-'''Test module for Russian syntax'''
+''' Unit tests: syntax. '''
 import unittest
 
 from cctext import RuSyntax, Capitalization
 
 
-class TestRusParser(unittest.TestCase):
+class TestRusSyntax(unittest.TestCase):
     ''' Test class for russian syntax. '''
 
     def test_capitalization(self):