CommentTracker.py (#26 closes #25)

python/selfie-lib/selfie_lib/CommentTracker.py

@@ -0,0 +1,87 @@
+from typing import Dict, Iterable, Tuple
+from enum import Enum, auto
+import threading
+from selfie_lib.TypedPath import TypedPath
+from selfie_lib.Slice import Slice
+
+
+# Placeholder implementations for CallStack, SnapshotFileLayout, and FS
+class CallStack:
+    pass
+
+
+class SnapshotFileLayout:
+    def sourcePathForCall(self, location) -> "TypedPath":
+        # Placeholder return or raise NotImplementedError
+        raise NotImplementedError("sourcePathForCall is not implemented")
+
+
+class WritableComment(Enum):
+    NO_COMMENT = auto()
+    ONCE = auto()
+    FOREVER = auto()
+
+    @property
+    def writable(self) -> bool:
+        return self != WritableComment.NO_COMMENT
+
+
+class CommentTracker:
+    def __init__(self):
+        self.cache: Dict[TypedPath, WritableComment] = {}
+        self.lock = threading.Lock()
+
+    def pathsWithOnce(self) -> Iterable[TypedPath]:
+        with self.lock:
+            return [
+                path
+                for path, comment in self.cache.items()
+                if comment == WritableComment.ONCE
+            ]
+
+    def hasWritableComment(self, call: CallStack, layout: SnapshotFileLayout) -> bool:
+        path = layout.sourcePathForCall(call)
+        with self.lock:
+            if path in self.cache:
+                comment = self.cache[path]
+                if comment.writable:
+                    return True
+                else:
+                    return False
+            else:
+                new_comment, _ = self.__commentAndLine(path)
+                self.cache[path] = new_comment
+                return new_comment.writable
+
+    @staticmethod
+    def commentString(typedPath: TypedPath) -> Tuple[str, int]:
+        comment, line = CommentTracker.__commentAndLine(typedPath)
+        if comment == WritableComment.NO_COMMENT:
+            raise ValueError("No writable comment found")
+        elif comment == WritableComment.ONCE:
+            return ("//selfieonce", line)
+        elif comment == WritableComment.FOREVER:
+            return ("//SELFIEWRITE", line)
+        else:
+            raise ValueError("Invalid comment type")
+
+    @staticmethod
+    def __commentAndLine(typedPath: TypedPath) -> Tuple[WritableComment, int]:
+        with open(typedPath.absolute_path, "r") as file:
+            content = Slice(file.read())
+        for comment_str in [
+            "//selfieonce",
+            "// selfieonce",
+            "//SELFIEWRITE",
+            "// SELFIEWRITE",
+        ]:
+            index = content.indexOf(comment_str)
+            if index != -1:
+                lineNumber = content.baseLineAtOffset(index)
+                comment = (
+                    WritableComment.ONCE
+                    if "once" in comment_str
+                    else WritableComment.FOREVER
+                )
+                return (comment, lineNumber)
+        return (WritableComment.NO_COMMENT, -1)

python/selfie-lib/selfie_lib/TypedPath.py

@@ -6,6 +6,9 @@ class TypedPath:
     def __init__(self, absolute_path: str):
         self.absolute_path = absolute_path
 
+    def __hash__(self):
+        return hash(self.absolute_path)
+
     @property
     def name(self) -> str:
         if self.absolute_path.endswith("/"):