feat: support save feature for dataset

legacy/src/lcr_connector/__init__.py

@@ -26,7 +26,7 @@ class AppResolver(enum.StrEnum):
     """The BFS resolver."""
 
 
-@dataclass
+@dataclass(frozen=True)
 class AppConfig:
     """
     The configuration for the app.

legacy/src/lcr_connector/dataset.py

@@ -1,9 +1,26 @@
 import enum
-from typing import Iterable
+from dataclasses import dataclass
+from typing import Iterable, Iterator
 from pathlib import Path
 from .common import LcrConnException
 
 
+@dataclass(frozen=True)
+class DatasetItem:
+    value: float
+    """The actual value of this item."""
+    str_value: str
+    """The string form of this value given from original input for re-saving."""
+
+    def __post_init__(self):
+        value = self.value
+        if value <= 0:
+            raise ValueError(f"Invalid value {value} in dataset")
+        str_value = self.str_value
+        if len(str_value) == 0:
+            raise ValueError(f"Unexpected empty string in dataset item")
+
+
 class Dataset:
     """
     A list holding available standard values for resistor, capacitor or inductor.
@@ -14,27 +31,34 @@ class Dataset:
     This list will only contain 100 and 4.7k.
     """
 
-    __values: tuple[float, ...]
+    __values: tuple[DatasetItem, ...]
     """A list of available device gauge values"""
 
-    def __init__(self, values: tuple[float, ...]):
+    def __init__(self, str_values: Iterable[str]):
-        # Check redundant parts
+        # Check string form value one by one
-        valueset = set(values)
+        value_items: list[DatasetItem] = []
-        if len(valueset) != len(values):
+        value_set: set[float] = set()
-            raise LcrConnException(f"Duplicate item in standard value list")
+        for str_value in str_values:
-        if len(valueset) == 0:
+            # Try parsing value
+            value = from_human_readable_value(str_value)
+            # Check and update set
+            if value in value_set:
+                raise LcrConnException(
+                    f"Duplicate item {str_value} in standard value list"
+                )
+            else:
+                value_set.add(value)
+            # Add into result
+            value_items.append(DatasetItem(value, str_value))
+        # Check empty case
+        if len(value_items) == 0:
             raise LcrConnException(f"Empty standard value list is not allowed")
         # Ok, assign it
-        self.__values = values
+        self.__values = tuple(value_items)
 
     @staticmethod
     def from_iterable(stringfied_values: Iterable[str]) -> "Dataset":
-        return Dataset(
+        return Dataset(stringfied_values)
-            tuple(
-                from_human_readable_value(stringfied_value)
-                for stringfied_value in stringfied_values
-            )
-        )
 
     @staticmethod
     def from_text(text: str) -> "Dataset":
@@ -48,14 +72,27 @@ class Dataset:
             legal_lines = filter(lambda line: line != "", (line.strip() for line in f))
             return Dataset.from_iterable(legal_lines)
 
+    def __save(self) -> Iterator[str]:
+        return map(lambda i: i.str_value, self.__values)
+
+    def save_iterator(self) -> Iterator[str]:
+        return self.__save()
+
+    def save_text(self) -> str:
+        return "\n".join(self.__save())
+
+    def save_file(self, filename: Path) -> None:
+        with open(filename, "w", encoding="utf-8") as f:
+            f.write(self.save_text())
+
     @property
-    def values(self) -> tuple[float, ...]:
+    def values(self) -> Iterator[float]:
         """
         Get the available standard values
 
         :return: A tuple of available standard values
         """
-        return self.__values
+        return map(lambda i: i.value, self.__values)
 
 
 class DatasetCollection:
@@ -79,6 +116,14 @@ class DatasetCollection:
     def from_iterable(
         resistor: Iterable[str], capacitor: Iterable[str], inductor: Iterable[str]
     ) -> "DatasetCollection":
+        """
+        Load the standard values for resistor, capacitor and inductor respectively from iterables.
+
+        :param resistor: The iterable to load available standard values for resistor
+        :param capacitor: The iterable to load available standard values for capacitor
+        :param inductor: The iterable to load available standard values for inductor
+        :return: The built dataset collection
+        """
         return DatasetCollection(
             Dataset.from_iterable(resistor),
             Dataset.from_iterable(capacitor),
@@ -87,6 +132,14 @@ class DatasetCollection:
 
     @staticmethod
     def from_text(resistor: str, capacitor: str, inductor: str) -> "DatasetCollection":
+        """
+        Load the standard values for resistor, capacitor and inductor respectively from strings.
+
+        :param resistor: The string to load available standard values for resistor
+        :param capacitor: The string to load available standard values for capacitor
+        :param inductor: The string to load available standard values for inductor
+        :return: The built dataset collection
+        """
         return DatasetCollection(
             Dataset.from_text(resistor),
             Dataset.from_text(capacitor),
@@ -97,12 +150,56 @@ class DatasetCollection:
     def from_file(
         resistor: Path, capacitor: Path, inductor: Path
     ) -> "DatasetCollection":
+        """
+        Load the standard values for resistor, capacitor and inductor respectively from files.
+
+        :param resistor: The file to load available standard values for resistor
+        :param capacitor: The file to load available standard values for capacitor
+        :param inductor: The file to load available standard values for inductor
+        :return: The built dataset collection
+        """
         return DatasetCollection(
             Dataset.from_file(resistor),
             Dataset.from_file(capacitor),
             Dataset.from_file(inductor),
         )
 
+    def save_iterator(self) -> tuple[Iterator[str], Iterator[str], Iterator[str]]:
+        """
+        Get the iterator of available standard values for resistor, capacitor and inductor respectively.
+
+        :return: A tuple of iterators of available standard values for resistor, capacitor and inductor respectively.
+        """
+        return (
+            self.__resistor.save_iterator(),
+            self.__capacitor.save_iterator(),
+            self.__inductor.save_iterator(),
+        )
+
+    def save_text(self) -> tuple[str, str, str]:
+        """
+        Get the string form of available standard values for resistor, capacitor and inductor respectively.
+
+        :return: A tuple of strings of available standard values for resistor, capacitor and inductor respectively.
+        """
+        return (
+            self.__resistor.save_text(),
+            self.__capacitor.save_text(),
+            self.__inductor.save_text(),
+        )
+
+    def save_file(self, resistor: Path, capacitor: Path, inductor: Path) -> None:
+        """
+        Save the available standard values for resistor, capacitor and inductor respectively to files.
+
+        :param resistor: The file to save available standard values for resistor
+        :param capacitor: The file to save available standard values for capacitor
+        :param inductor: The file to save available standard values for inductor
+        """
+        self.__resistor.save_file(resistor)
+        self.__capacitor.save_file(capacitor)
+        self.__inductor.save_file(inductor)
+
     @property
     def resistor_values(self) -> Dataset:
         """

legacy/src/lcr_connector/query.py

@@ -20,7 +20,7 @@ MAX_RESPONSE_CNT: int = 50
 """The maximum count for the response item count passed in request."""
 
 
-@dataclass
+@dataclass(frozen=True)
 class Request:
     """
     All request infomation for the resolver.