Add deprecation warning

python/src/morpheme.rs

@@ -58,13 +58,16 @@ impl PyMorphemeListWrapper {
     /// Returns an empty morpheme list with dictionary
     #[classmethod]
     #[pyo3(text_signature = "(dict)")]
-    fn empty(_cls: &PyType, dict: &PyDictionary) -> Self {
-        Self {
+    fn empty(_cls: &PyType, py: Python, dict: &PyDictionary) -> PyResult<Self> {
+        let cat = PyModule::import(py, "builtins")?.getattr("DeprecationWarning")?;
+        PyErr::warn(py, cat, "Users should not generate MorphemeList by themselves. Use Tokenizer.tokenize(\"\") if you need.", 1)?;
+
+        Ok(Self {
             inner: Arc::new(PyMorphemeList {
                 list: MorphemeList::empty(dict.dictionary.as_ref().unwrap().clone()),
                 boundaries: Vec::new(),
             }),
-        }
+        })
     }
 
     /// Returns the total cost of the path
@@ -255,7 +258,15 @@ impl PyMorpheme {
 
     /// Returns a list of morphemes splitting itself with given split mode
     #[pyo3(text_signature = "($self, mode, /)")]
-    fn split(&self, mode: PySplitMode) -> PyResult<PyMorphemeListWrapper> {
+    fn split(&self, py: Python, mode: PySplitMode) -> PyResult<PyMorphemeListWrapper> {
+        let cat = PyModule::import(py, "builtins")?.getattr("DeprecationWarning")?;
+        PyErr::warn(
+            py,
+            cat,
+            "API around this functionality will change. See github issue #92 for more.",
+            1,
+        )?;
+
         Ok(self
             .list
             .split(mode.into(), self.index)
@@ -292,7 +303,10 @@ impl PyMorpheme {
 
     /// Returns the word info
     #[pyo3(text_signature = "($self)")]
-    fn get_word_info(&self) -> PyWordInfo {
-        self.list.get_word_info(self.index).clone().into()
+    fn get_word_info(&self, py: Python) -> PyResult<PyWordInfo> {
+        let cat = PyModule::import(py, "builtins")?.getattr("DeprecationWarning")?;
+        PyErr::warn(py, cat, "Users should not touch the raw WordInfo.", 1)?;
+
+        Ok(self.list.get_word_info(self.index).clone().into())
     }
 }