Closes #9 Add support for complex/multiple ACF values

src/acfvalue.py

@@ -0,0 +1,56 @@
+from constants import Constants
+
+
+class ACFValue:
+    """Handle complex/multiple ACF values."""
+
+    def __init__(self, value):
+        """Given a string describing an acf value, build an object with the
+        following attrributes:
+        - is_numeric: whether the value is a number or a string;
+        - numeric_value: the numeric value (if any, zero otherwise);
+        - unknown: whether the value is unknown."""
+        if value == Constants.UNKNOWN:
+            self._value = value
+            self._description = ""
+            self._string = self._value
+            self.is_numeric = False
+            self.unknown = True
+            self.numeric_value = 0.0
+        else:
+            self.unknown = False
+            if Constants.ACF_SEPARATOR in value:
+                description, acf_value = value.split(Constants.ACF_SEPARATOR)
+                self._description = description
+                self._value = acf_value
+                self._string = f"{self._description}: {self._value}"
+            else:
+                self._description = ""
+                self._value = value
+                self._string = self._value
+            try:
+                self.numeric_value = float(self._value)
+            except Exception:
+                self.is_numeric = False
+                self.numeric_value = 0.0
+            else:
+                self.is_numeric = True
+                self._string += " ms"
+
+    @classmethod
+    def list_from_series(cls, series):
+        """Parse all acf values from the database.
+
+        Accept an iterable of ACFValues.
+        Return a list of lists of ACFValues."""
+        entries = []
+        for entry in series:
+            entries.append([
+                cls(value.strip()) for value in entry.split(Constants.FIELD_SEPARATOR)
+            ])
+        return entries
+
+    @staticmethod
+    def concat_strings(acf_list_values):
+        """Concatenate a list of ACFValues to be displayed."""
+        return '\n'.join(s._string for s in acf_list_values)