[ENH] Preprocess - Use language from Corpus

orangecontrib/text/keywords/__init__.py

@@ -20,7 +20,7 @@
 from orangecontrib.text.vectorization import BowVectorizer
 
 # all available languages for RAKE
-RAKE_LANGUAGES = StopwordsFilter.supported_languages()
+RAKE_LANGUAGES = StopwordsFilter.supported_languages
 # all available languages for YAKE!
 # fmt: off
 YAKE_LANGUAGES = [

orangecontrib/text/preprocess/filter.py

@@ -117,9 +117,10 @@ def lang_to_iso(language: str) -> str:
         """
         return LANG2ISO[StopwordsFilter.NLTK2LANG.get(language, language)]
 
-    @staticmethod
+    @classmethod
+    @property
     @wait_nltk_data
-    def supported_languages() -> Set[str]:
+    def supported_languages(_) -> Set[str]:
         """
         List all languages supported by NLTK
 

orangecontrib/text/preprocess/normalize.py

@@ -122,6 +122,10 @@ def __files_to_dict(self, files: List[Tuple[str]]) -> Dict[str, Tuple[str, str]]
     def supported_languages(self) -> List[Tuple[str, str]]:
         return [(name, iso) for iso, (name, _) in self.model_files.items()]
 
+    @property
+    def supported_languages_iso(self) -> List[Tuple[str, str]]:
+        return {iso for _, iso in self.supported_languages}
+
     @property
     def online(self) -> bool:
         try:

orangecontrib/text/tests/test_preprocess.py

@@ -486,7 +486,7 @@ def test_stopwords_slovene(self):
         self.assertEqual(len(corpus.used_preprocessor.preprocessors), 2)
 
     def test_supported_languages(self):
-        langs = preprocess.StopwordsFilter.supported_languages()
+        langs = preprocess.StopwordsFilter.supported_languages
         self.assertIsInstance(langs, set)
         # just testing few of most important languages since I want for test to be
         # resistant for any potentially newly introduced languages by NLTK

orangecontrib/text/widgets/owpreprocess.py

@@ -11,6 +11,8 @@
 from AnyQt.QtGui import QBrush, QValidator
 
 from Orange.util import wrap_callback
+from orangecanvas.gui.utils import disconnected
+from orangewidget.settings import SettingsHandler
 from orangewidget.utils.filedialogs import RecentPath
 
 import Orange.widgets.data.owpreprocess
@@ -112,7 +114,8 @@ def set_current_language(self, iso_language: Optional[str]):
             The ISO language code of element to be selected.
         """
         index = self.findData(iso_language)
-        self.setCurrentIndex(index)
+        if index >= 0:
+            self.setCurrentIndex(index)
 
 
 class UDPipeComboBox(LanguageComboBox):
@@ -130,15 +133,9 @@ def items(self) -> List:
     def add_items(self, _, include_none: bool, language: str):
         self.__items = self.items
         super().add_items(self.__items, include_none, language)
-
-    def set_current_language(self, iso_language: Optional[str]):
         iso_items = {iso for _, iso in self.__items}
-        if iso_language in iso_items:
-            super().set_current_language(iso_language)
-        elif self.__default_lang in iso_items:
+        if language not in iso_items and self.__default_lang in iso_items:
             super().set_current_language(self.__default_lang)
-        elif self.__items:
-            self.setCurrentIndex(0)
 
     def showPopup(self):
         if self.__items != self.items:
@@ -657,7 +654,7 @@ def __init__(self, parent=None, **kwargs):
 
         self.__combo = LanguageComboBox(
             self,
-            StopwordsFilter.supported_languages(),
+            StopwordsFilter.supported_languages,
             self.__sw_lang,
             True,
             self.__set_language,
@@ -1044,6 +1041,21 @@ def createinstance(params: Dict) -> POSTagger:
         return POSTaggingModule.Methods[method]()
 
 
+class PreprocessSettingsHandler(SettingsHandler):
+    """
+    Settings handler, that makes all language settings, which are
+    a part of common preprocess settings, schema_only. It removes them when
+    settings are not loaded from schema but from common settings.
+    """
+    def _remove_schema_only(self, settings_dict):
+        super()._remove_schema_only(settings_dict)
+        for setting, data, _ in self.provider.traverse_settings(data=settings_dict):
+            for pp_name, settings in data["storedsettings"]["preprocessors"]:
+                for key in list(settings):
+                    if "language" in key:
+                        settings.pop(key)
+
+
 PREPROCESS_ACTIONS = [
     PreprocessAction(
         "Transformation", "preprocess.transform", "",
@@ -1127,12 +1139,14 @@ class Warning(Orange.widgets.data.owpreprocess.OWPreprocess.Warning):
                                     ("preprocess.tokenize", {}),
                                     ("preprocess.filter", {})]
                   }  # type: Dict[str, List[Tuple[str, Dict]]]
+    settingsHandler = PreprocessSettingsHandler()
     storedsettings = Setting(DEFAULT_PP)
     buttons_area_orientation = Qt.Vertical
 
     def __init__(self):
         ConcurrentWidgetMixin.__init__(self)
         Orange.widgets.data.owpreprocess.OWPreprocess.__init__(self)
+        self.__store_pending_languages()
 
         box = gui.vBox(self.controlArea, "Preview")
         self.preview = ""
@@ -1150,6 +1164,16 @@ def load(self, saved: Dict) -> StandardItemModel:
                 saved["preprocessors"][i] = (name, params)
         return super().load(saved)
 
+    def set_model(self, pmodel):
+        """Connect signal which handle setting language from corpus"""
+        super().set_model(pmodel)
+        if pmodel:
+            pmodel.rowsInserted.connect(self.__on_item_inserted)
+
+    def __on_item_inserted(self, _, first: int, last: int):
+        assert first == last
+        self.__set_languages_single_editor(first)
+
     def __update_filtering_params(self, params: Dict):
         params["sw_path"] = self.__relocate_file(params.get("sw_path"))
         params["sw_list"] = self.__relocate_files(params.get("sw_list", []))
@@ -1179,6 +1203,49 @@ def __relocate_file(self, path: RecentPath) -> RecentPath:
     def set_data(self, data: Corpus):
         self.cancel()
         self.data = data
+        self.__set_languages()
+
+    LANG_PARAMS = {
+        "preprocess.normalize": [
+            ("snowball_language", SnowballStemmer.supported_languages),
+            ("udpipe_language", UDPipeModels().supported_languages_iso),
+            ("lemmagen_language", LemmagenLemmatizer.supported_languages),
+        ],
+        "preprocess.filter": [("language", StopwordsFilter.supported_languages)],
+    }
+
+    def __store_pending_languages(self):
+        settings = self.storedsettings["preprocessors"]
+        self.__pending_languages = {
+            pp_name: {p for p in par if "language" in p} for pp_name, par in settings
+        }
+
+    def __set_languages(self):
+        if self.data is not None:
+            for i in range(self.preprocessormodel.rowCount()):
+                self.__set_languages_single_editor(i)
+            self.__pending_languages = {}
+
+    def __set_languages_single_editor(self, item_index: int):
+        """
+        Set language from corpus for single editor/module,
+        keep language unchanged if it comes from schema (pending).
+        """
+        if self.data and self.data.language:
+            model = self.preprocessormodel
+            item = model.item(item_index)
+            pp_name = item.data(DescriptionRole).qualname
+            params = item.data(ParametersRole)
+            pending = self.__pending_languages.get(pp_name, set())
+            for param, available_langs in self.LANG_PARAMS.get(pp_name, []):
+                if param not in pending and self.data.language in available_langs:
+                    # set language if not pending from schema - should not be changed
+                    # and if available for the method
+                    params[param] = self.data.language
+            with disconnected(model.dataChanged, self.__on_modelchanged):
+                # disconnection prevent double apply call, it is already called
+                # on new data and when row inserted, both caller of this method
+                item.setData(params, ParametersRole)
 
     def buildpreproc(self) -> PreprocessorList:
         plist = []

orangecontrib/text/widgets/tests/test_owpreprocess.py

@@ -2,7 +2,9 @@
 from unittest.mock import patch, PropertyMock, MagicMock, Mock
 
 import numpy as np
+from AnyQt.QtGui import QStandardItem, QIcon
 from Orange.data import Domain, StringVariable
+from Orange.widgets.data.utils.preprocess import DescriptionRole, ParametersRole
 from orangewidget.utils.filedialogs import RecentPath
 from Orange.widgets.tests.base import WidgetTest
 from Orange.widgets.tests.utils import simulate
@@ -180,6 +182,153 @@ def test_no_tokens_left(self):
         self.wait_until_finished()
         self.assertFalse(self.widget.Warning.no_token_left.is_shown())
 
+    def test_language_from_corpus(self):
+        """Test language from corpus is set correctly"""
+        initial = {
+            "name": "",
+            "preprocessors": [("preprocess.normalize", {}), ("preprocess.filter", {})],
+        }
+        self.widget.storedsettings = initial
+        self.widget._initialize()
+        self.assertDictEqual(initial, self.widget.storedsettings)
+        combos = self.widget.mainArea.findChildren(LanguageComboBox)
+        self.assertEqual(
+            ["English", "English", "English", "English"],
+            [c.currentText() for c in combos]
+        )
+
+        # test with Slovenian - language should set for all preprocessors except
+        # Snowball that doesn't support Slovenian
+        self.corpus.attributes["language"] = "sl"
+        self.send_signal(self.widget.Inputs.corpus, self.corpus)
+        self.assertEqual(
+            ["English", "Slovenian", "Slovenian", "Slovenian"],
+            [c.currentText() for c in combos]
+        )
+        settings = self.widget.storedsettings["preprocessors"]
+        self.assertEqual("sl", settings[0][1]["udpipe_language"])
+        self.assertEqual("sl", settings[0][1]["lemmagen_language"])
+        self.assertEqual("sl", settings[1][1]["language"])
+
+        # test with Lithuanian that is support by one preprocessors
+        self.corpus.attributes["language"] = "lt"
+        self.send_signal(self.widget.Inputs.corpus, self.corpus)
+        self.assertEqual(
+            ["English", "Lithuanian", "Slovenian", "Slovenian"],
+            [c.currentText() for c in combos]
+        )
+        settings = self.widget.storedsettings["preprocessors"]
+        self.assertEqual("lt", settings[0][1]["udpipe_language"])
+        self.assertEqual("sl", settings[0][1]["lemmagen_language"])
+        self.assertEqual("sl", settings[1][1]["language"])
+
+        self.corpus.attributes["language"] = "pt"
+        self.send_signal(self.widget.Inputs.corpus, self.corpus)
+        self.assertEqual(
+            ["Portuguese", "Portuguese", "Slovenian", "Portuguese"],
+            [c.currentText() for c in combos]
+        )
+        settings = self.widget.storedsettings["preprocessors"]
+        self.assertEqual("pt", settings[0][1]["snowball_language"])
+        self.assertEqual("pt", settings[0][1]["udpipe_language"])
+        self.assertEqual("sl", settings[0][1]["lemmagen_language"])
+        self.assertEqual("pt", settings[1][1]["language"])
+
+        # language not supported by any preprocessor - language shouldn't change
+        self.corpus.attributes["language"] = "bo"
+        self.send_signal(self.widget.Inputs.corpus, self.corpus)
+        self.assertEqual(
+            ["Portuguese", "Portuguese", "Slovenian", "Portuguese"],
+            [c.currentText() for c in combos]
+        )
+        settings = self.widget.storedsettings["preprocessors"]
+        self.assertEqual("pt", settings[0][1]["snowball_language"])
+        self.assertEqual("pt", settings[0][1]["udpipe_language"])
+        self.assertEqual("sl", settings[0][1]["lemmagen_language"])
+        self.assertEqual("pt", settings[1][1]["language"])
+
+        # test with missing language - language shouldn't change
+        self.corpus.attributes["language"] = None
+        self.send_signal(self.widget.Inputs.corpus, self.corpus)
+        self.assertEqual(
+            ["Portuguese", "Portuguese", "Slovenian", "Portuguese"],
+            [c.currentText() for c in combos]
+        )
+        settings = self.widget.storedsettings["preprocessors"]
+        self.assertEqual("pt", settings[0][1]["snowball_language"])
+        self.assertEqual("pt", settings[0][1]["udpipe_language"])
+        self.assertEqual("sl", settings[0][1]["lemmagen_language"])
+        self.assertEqual("pt", settings[1][1]["language"])
+
+    def test_language_from_schema(self):
+        """Test language from schema/workflow is retained"""
+        initial = {
+            "name": "",
+            "preprocessors": [
+                (
+                    "preprocess.normalize",
+                    {
+                        "lemmagen_language": "sl",
+                        "snowball_language": "nl",
+                        "udpipe_language": "lt",
+                    },
+                ),
+                ("preprocess.filter", {"language": "nl"}),
+            ],
+        }
+        self.widget.storedsettings = initial
+
+        settings = self.widget.settingsHandler.pack_data(self.widget)
+        widget = self.create_widget(OWPreprocess, stored_settings=settings)
+        self.send_signal(widget.Inputs.corpus, self.corpus, widget=widget)
+        self.assertDictEqual(initial, widget.storedsettings)
+        combos = widget.mainArea.findChildren(LanguageComboBox)
+        self.assertEqual(
+            ["Dutch", "Lithuanian", "Slovenian", "Dutch"],
+            [c.currentText() for c in combos]
+        )
+
+    def test_language_from_corpus_editor_inserted(self):
+        """Test language from corpus is set to new editor too"""
+        initial = {
+            "name": "",
+            "preprocessors": [("preprocess.filter", {})],
+        }
+        self.widget.storedsettings = initial
+        self.widget._initialize()
+        self.assertDictEqual(initial, self.widget.storedsettings)
+        combos = self.widget.mainArea.findChildren(LanguageComboBox)
+        self.assertEqual(
+            ["English"],
+            [c.currentText() for c in combos]
+        )
+
+        # insert data - language of stopwords combo should change to italian
+        self.corpus.attributes["language"] = "sl"
+        self.send_signal(self.widget.Inputs.corpus, self.corpus)
+        self.assertEqual(
+            ["Slovenian"],
+            [c.currentText() for c in combos]
+        )
+
+        # insert new editor - all languages except snowball should be set to Slovenian
+        pp_def = self.widget._qname2ppdef["preprocess.normalize"]
+        description = pp_def.description
+        item = QStandardItem(description.title)
+        icon = QIcon(description.icon)
+        item.setIcon(icon)
+        item.setToolTip(description.summary)
+        item.setData(pp_def, DescriptionRole)
+        item.setData({}, ParametersRole)
+        self.widget.preprocessormodel.insertRow(0, [item])
+        self.wait_until_finished()
+
+        combos = self.widget.mainArea.findChildren(LanguageComboBox)
+        self.assertEqual(
+            ['Slovenian', 'English', 'Slovenian', 'Slovenian'],
+            [c.currentText() for c in combos]
+        )
+
 
 @patch(SF_LIST, new=Mock(return_value=SERVER_FILES))
 class TestOWPreprocessMigrateSettings(WidgetTest):
@@ -983,14 +1132,20 @@ def test_set_current_language(self):
         self.assertEqual("Portuguese", cb.currentText())
         cb.set_current_language("sl")
         self.assertEqual("Slovenian", cb.currentText())
-        cb.set_current_language("abc")  # should set to default
-        self.assertEqual("English", cb.currentText())
+        cb.set_current_language("abc")  # language not in list - keep current seleciton
+        self.assertEqual("Slovenian", cb.currentText())
+
+    def test_set_language_to_default(self):
+        """In case current item not in dropdown anymore set language to default"""
+        mock = Mock()
+        cb = UDPipeComboBox(None, "pt", "en", mock)
+        self.assertEqual("Portuguese", cb.currentText())
         # when no default language in the dropdown set to first
         cb.removeItem(0)
         x = cb._UDPipeComboBox__items
         cb._UDPipeComboBox__items = x[:3] + x[4:]
-        cb.set_current_language("abc")
-        self.assertEqual("English (lines)", cb.currentText())
+        cb.showPopup()
+        self.assertEqual("English", cb.currentText())
 
     def test_change_item(self):
         mock = Mock()