From 723c9a963a96b25a7498f3e0417307e89c8bb684 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 31 May 2023 22:56:15 +0800
Subject: HALF WORK: for sync.

---
 tools/cru-py/cru/parsing.py | 70 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 tools/cru-py/cru/parsing.py

(limited to 'tools/cru-py/cru/parsing.py')

diff --git a/tools/cru-py/cru/parsing.py b/tools/cru-py/cru/parsing.py
new file mode 100644
index 0000000..be7bbf4
--- /dev/null
+++ b/tools/cru-py/cru/parsing.py
@@ -0,0 +1,70 @@
+from abc import ABCMeta, abstractmethod
+from typing import TypeVar, Generic, NoReturn, Callable
+
+from cru.excp import CruException, CRU_EXCEPTION_ATTR_DEF_REGISTRY
+
+R = TypeVar("R")
+
+
+class ParseException(CruException):
+    LINE_NUMBER_KEY = "line_number"
+
+    CRU_EXCEPTION_ATTR_DEF_REGISTRY.register_with(LINE_NUMBER_KEY, "Line number of the error.")
+
+
+class Parser(Generic[R], metaclass=ABCMeta):
+    def __init__(self, name: str) -> None:
+        self._name = name
+
+    @property
+    def name(self) -> str:
+        return self._name
+
+    @abstractmethod
+    def parse(self, s: str) -> R:
+        raise NotImplementedError()
+
+    def raise_parse_exception(self, s: str, line_number: int | None = None) -> NoReturn:
+        a = f" at line {line_number}" if line_number is not None else ""
+        raise ParseException(f"Parser {self.name} failed{a}, {s}")
+
+
+class SimpleLineConfigParser(Parser[list[tuple[str, str]]]):
+    def __init__(self) -> None:
+        super().__init__(type(self).__name__)
+
+    def _parse(self, s: str, f: Callable[[str, str], None]) -> None:
+        for ln, line in enumerate(s.splitlines()):
+            line_number = ln + 1
+            # check if it's a comment
+            if line.strip().startswith("#"):
+                continue
+            # check if there is a '='
+            if line.find("=") == -1:
+                self.raise_parse_exception(f"There is even no '='!", line_number)
+            # split at first '='
+            key, value = line.split("=", 1)
+            key = key.strip()
+            value = value.strip()
+            f(key, value)
+
+    def parse(self, s: str) -> list[tuple[str, str]]:
+        items = []
+        self._parse(s, lambda key, value: items.append((key, value)))
+        return items
+
+    def parse_to_dict(self, s: str, /, allow_override: bool = False) -> tuple[dict[str, str], list[tuple[str, str]]]:
+        d = {}
+        duplicate = []
+
+        def add(key: str, value: str) -> None:
+            if key in d:
+                if allow_override:
+                    duplicate.append((key, d[key]))
+                    d[key] = value
+                else:
+                    self.raise_parse_exception(f"Key '{key}' already exists!", None)
+            d[key] = value
+
+        self._parse(s, add)
+        return d, duplicate
-- 
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