fix: SMILES parse error handling

app/modules/coconut/preprocess.py

@@ -23,19 +23,16 @@ def get_mol_block(input_text: str) -> str:
     Raises:
         ValueError: If input_text is not a valid Mol or SMILES.
     """
-    check = rdkitmodules.is_valid_molecule(input_text)
 
-    if check == "smiles":
+    try:
         molecule = parse_input(input_text, "cdk", False)
         mol_block = cdk.get_CDK_SDG_mol(
             molecule,
             V3000=False,
         ).replace("$$$$\n", "")
         return mol_block
-    elif check == "mol":
-        return input_text
-    else:
-        return "Error!, Check the input text."
+    except InvalidInputException:
+        raise InvalidInputException(f"Invalid input SMILES: {input_text}")
 
 
 def get_molecule_hash(molecule: any) -> dict:
@@ -109,6 +106,7 @@ def get_COCONUT_preprocessing(
 
         # Original molecule
         original_mol = parse_input(input_text, "rdkit", False)
+
         original_mol_block = get_mol_block(input_text)
         original_mol_hash = get_molecule_hash(original_mol)
         original_representations = get_representations(original_mol)

app/modules/toolkits/helpers.py

@@ -35,6 +35,8 @@ def parse_SMILES(smiles: str, framework: str = "rdkit", standardize: bool = Fals
 
     Args:
         smiles (str): Input SMILES string.
+        framework (str): Framework to use for parsing. Default is "rdkit".
+        standardize (bool): Whether to standardize the molecule. Default is False.
 
     Returns:
         Chem.Mol or None: Valid molecule object or None if an error occurs.
@@ -43,7 +45,7 @@ def parse_SMILES(smiles: str, framework: str = "rdkit", standardize: bool = Fals
     try:
         smiles = smiles.replace(" ", "+")
         if framework == "rdkit":
-            if smiles.__contains__("R"):
+            if "R" in smiles:
                 mol = get_CDK_IAtomContainer(smiles)
                 mol_str = get_CDK_SDG_mol(mol)
                 mol = Chem.MolFromMolBlock(mol_str)
@@ -55,9 +57,15 @@ def parse_SMILES(smiles: str, framework: str = "rdkit", standardize: bool = Fals
             mol = get_CDK_IAtomContainer(smiles)
         elif framework == "openbabel":
             mol = get_ob_mol(smiles)
+        else:
+            raise ValueError(f"Invalid framework specified: {framework}")
+
         if mol:
             return mol
         else:
-            raise InvalidInputException(name="smiles", value=smiles)
+            mol = get_CDK_IAtomContainer(smiles)
+            mol_str = get_CDK_SDG_mol(mol)
+            return Chem.MolFromMolBlock(mol_str)
+
     except Exception:
         raise InvalidInputException(name="smiles", value=smiles)