From 2aa397d609e8ef12790fbede786170850d9fb7e9 Mon Sep 17 00:00:00 2001
From: juk0de <git@kadidlo.de>
Date: Fri, 18 Aug 2023 16:07:50 +0200
Subject: [PATCH] added new module 'message.py'

---
 chatmastermind/message.py | 135 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 chatmastermind/message.py

diff --git a/chatmastermind/message.py b/chatmastermind/message.py
new file mode 100644
index 0000000..5136a4e
--- /dev/null
+++ b/chatmastermind/message.py
@@ -0,0 +1,135 @@
+"""
+Module implementing message related functions and classes.
+"""
+import pathlib
+from typing import Type, TypeVar, Optional, Any, Final
+from dataclasses import dataclass, asdict, field
+from .tags import Tag
+
+QuestionInst = TypeVar('QuestionInst', bound='Question')
+AnswerInst = TypeVar('AnswerInst', bound='Answer')
+MessageInst = TypeVar('MessageInst', bound='Message')
+
+
+class MessageError(Exception):
+    pass
+
+
+def source_code(text: str, include_delims: bool = False) -> list[str]:
+    """
+    Extract all source code sections from the given text, i. e. all lines
+    surrounded by lines tarting with '```'. If 'include_delims' is True,
+    the surrounding lines are included, otherwise they are omitted. The
+    result list contains every source code section as a single string.
+    The order in the list represents the order of the sections in the text.
+    """
+    code_sections: list[str] = []
+    code_lines: list[str] = []
+    in_code_block = False
+
+    for line in text.split('\n'):
+        if line.strip().startswith('```'):
+            if include_delims:
+                code_lines.append(line)
+            if in_code_block:
+                code_sections.append('\n'.join(code_lines) + '\n')
+                code_lines.clear()
+            in_code_block = not in_code_block
+        elif in_code_block:
+            code_lines.append(line)
+
+    return code_sections
+
+
+class Question(str):
+    """
+    A single question with a defined header.
+    """
+    header: Final[str] = '=== QUESTION ==='
+
+    def __new__(cls: Type[QuestionInst], string: str) -> QuestionInst:
+        """
+        Make sure the question string does not contain the header.
+        """
+        if cls.header in string:
+            raise MessageError(f"Question '{string}' contains the header '{cls.header}'")
+        instance = super().__new__(cls, string)
+        return instance
+
+    def source_code(self, include_delims: bool = False) -> list[str]:
+        """
+        Extract and return all source code sections.
+        """
+        return source_code(self, include_delims)
+
+
+class Answer(str):
+    """
+    A single answer with a defined header.
+    """
+    header: Final[str] = '=== ANSWER ==='
+
+    def __new__(cls: Type[AnswerInst], string: str) -> AnswerInst:
+        """
+        Make sure the answer string does not contain the header.
+        """
+        if cls.header in string:
+            raise MessageError(f"Answer '{string}' contains the header '{cls.header}'")
+        instance = super().__new__(cls, string)
+        return instance
+
+    def source_code(self, include_delims: bool = False) -> list[str]:
+        """
+        Extract and return all source code sections.
+        """
+        return source_code(self, include_delims)
+
+
+@dataclass
+class Message():
+    """
+    Single message. Consists of a question and optionally an answer, a set of tags
+    and a file path.
+    """
+    question: Question
+    answer: Optional[Answer]
+    tags: Optional[set[Tag]]
+    file_path: Optional[pathlib.Path]
+    file_suffixes: Final[list[str]] = field(default_factory=lambda: ['.txt', '.yaml'])
+
+    # @classmethod
+    # def from_file(cls: Type[MessageInst], file_path: pathlib.Path) -> MessageInst:
+    #     """
+    #     Create a Message from the given file. Expects the following file structure:
+    #     * TagLine (from 'self.tags')
+    #     * Question.Header
+    #     * Question
+    #     * Answer.Header
+    #     """
+    #     if file_path:
+    #         self.file_path = file_path
+    #     if not self.file_path:
+    #         raise MessageError("Got no valid path to read message")
+    #     if self.file_path.suffix not in self.file_suffixes:
+    #         raise MessageError(f"File type '{self.file_path.suffix}' is not supported")
+    #     pass
+
+    def to_file(self, file_path: Optional[pathlib.Path]) -> None:
+        """
+        Write Message to the given file. Creates the following file structure:
+        * TagLine (from 'self.tags')
+        * Question.Header
+        * Question
+        * Answer.Header
+        * Answer
+        """
+        if file_path:
+            self.file_path = file_path
+        if not self.file_path:
+            raise MessageError("Got no valid path to write message")
+        if self.file_path.suffix not in self.file_suffixes:
+            raise MessageError(f"File type '{self.file_path.suffix}' is not supported")
+        pass
+
+    def asdict(self) -> dict[str, Any]:
+        return asdict(self)