move JS_WORLD_MAP to usertypes, circular import

qutebrowser/browser/webengine/webenginesettings.py

@@ -469,7 +469,7 @@ def _inject_greasemonkey_scripts(profile, scripts):
                 continue
         except ValueError:
             try:
-                world = qtutils.JS_WORLD_MAP[usertypes.JsWorld[script.jsworld.lower()]]
+                world = usertypes.JS_WORLD_MAP[usertypes.JsWorld[script.jsworld.lower()]]
             except KeyError:
                 log.greasemonkey.error(
                     f"script {script.name} has invalid value for '@qute-js-world'"

qutebrowser/utils/qtutils.py

@@ -25,7 +25,6 @@ Module attributes:
     MINVALS: A dictionary of C/Qt types (as string) mapped to their minimum
              value.
     MAX_WORLD_ID: The highest world ID allowed by QtWebEngine.
-    JS_WORLD_MAP: Mapping form usertypes.JsWorld to QWebEngineScript.ScriptWorldId
 """
 
 
@@ -42,7 +41,6 @@ from qutebrowser.qt.core import (qVersion, QEventLoop, QDataStream, QByteArray,
                           QIODevice, QFileDevice, QSaveFile, QT_VERSION_STR,
                           PYQT_VERSION_STR, QObject, QUrl, QLibraryInfo)
 from qutebrowser.qt.gui import QColor
-from qutebrowser.qt.webenginecore import QWebEngineScript
 try:
     from qutebrowser.qt.webkit import qWebKitVersion
 except ImportError:  # pragma: no cover
@@ -119,18 +117,6 @@ def version_check(version: str,
 MAX_WORLD_ID = 256
 
 
-# Mapping worlds from usertypes.JsWorld to QWebEngineScript world IDs.
-if not QWebEngineScript:
-    JS_WORLD_MAP = {}
-else:
-    JS_WORLD_MAP = {
-        usertypes.JsWorld.main: QWebEngineScript.ScriptWorldId.MainWorld,
-        usertypes.JsWorld.application: QWebEngineScript.ScriptWorldId.ApplicationWorld,
-        usertypes.JsWorld.user: QWebEngineScript.ScriptWorldId.UserWorld,
-        usertypes.JsWorld.jseval: QWebEngineScript.ScriptWorldId.UserWorld + 1,
-    }
-
-
 def is_new_qtwebkit() -> bool:
     """Check if the given version is a new QtWebKit."""
     assert qWebKitVersion is not None

qutebrowser/utils/usertypes.py

@@ -25,8 +25,11 @@ import enum
 import dataclasses
 from typing import Optional, Sequence, TypeVar, Union
 
-from qutebrowser.qt.core import pyqtSignal, pyqtSlot, QObject, QTimer
-from qutebrowser.qt.core import QUrl
+from qutebrowser.qt.core import pyqtSignal, pyqtSlot, QObject, QTimer, QUrl
+try:
+    from qutebrowser.qt.webenginecore import QWebEngineScript
+except ImportError:
+    QWebEngineScript = None
 
 from qutebrowser.utils import log, qtutils, utils
 
@@ -316,6 +319,18 @@ class JsWorld(enum.Enum):
     jseval = enum.auto()  #: World used for the jseval-command.
 
 
+# Mapping worlds from JsWorld to QWebEngineScript world IDs.
+if QWebEngineScript:  # type: ignore[truthy-function]
+    JS_WORLD_MAP = {
+        JsWorld.main: QWebEngineScript.ScriptWorldId.MainWorld,
+        JsWorld.application: QWebEngineScript.ScriptWorldId.ApplicationWorld,
+        JsWorld.user: QWebEngineScript.ScriptWorldId.UserWorld,
+        JsWorld.jseval: QWebEngineScript.ScriptWorldId.UserWorld + 1,
+    }
+else:
+    JS_WORLD_MAP = {}  # type: ignore[unreachable]
+
+
 class JsLogLevel(enum.Enum):
 
     """Log level of a JS message.