1 files changed, 293 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/selectors/pause.js b/devtools/client/debugger/src/selectors/pause.js
new file mode 100644
index 0000000000..a1bccda7c4
--- /dev/null
+++ b/devtools/client/debugger/src/selectors/pause.js
@@ -0,0 +1,293 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { getThreadPauseState } from "../reducers/pause";
+import { getSelectedSource, getSelectedLocation } from "./sources";
+import { getBlackBoxRanges } from "./source-blackbox";
+
+// eslint-disable-next-line
+import { getSelectedLocation as _getSelectedLocation } from "../utils/selected-location";
+import { isFrameBlackBoxed } from "../utils/source";
+import { createSelector } from "devtools/client/shared/vendor/reselect";
+
+export const getSelectedFrame = createSelector(
+  (state, thread) => state.pause.threads[thread],
+  threadPauseState => {
+    if (!threadPauseState) return null;
+    const { selectedFrameId, frames } = threadPauseState;
+    if (frames) {
+      return frames.find(frame => frame.id == selectedFrameId);
+    }
+    return null;
+  }
+);
+
+export const getVisibleSelectedFrame = createSelector(
+  getSelectedLocation,
+  state => getSelectedFrame(state, getCurrentThread(state)),
+  (selectedLocation, selectedFrame) => {
+    if (!selectedFrame) {
+      return null;
+    }
+
+    const { id, displayName } = selectedFrame;
+
+    return {
+      id,
+      displayName,
+      location: _getSelectedLocation(selectedFrame, selectedLocation),
+    };
+  }
+);
+
+export function getContext(state) {
+  return state.pause.cx;
+}
+
+export function getThreadContext(state) {
+  return state.pause.threadcx;
+}
+
+export function getNavigateCounter(state) {
+  return state.pause.threadcx.navigateCounter;
+}
+
+export function getPauseReason(state, thread) {
+  return getThreadPauseState(state.pause, thread).why;
+}
+
+export function getShouldBreakpointsPaneOpenOnPause(state, thread) {
+  return getThreadPauseState(state.pause, thread)
+    .shouldBreakpointsPaneOpenOnPause;
+}
+
+export function getPauseCommand(state, thread) {
+  return getThreadPauseState(state.pause, thread).command;
+}
+
+export function isStepping(state, thread) {
+  return ["stepIn", "stepOver", "stepOut"].includes(
+    getPauseCommand(state, thread)
+  );
+}
+
+export function getCurrentThread(state) {
+  return getThreadContext(state).thread;
+}
+
+export function getIsPaused(state, thread) {
+  return getThreadPauseState(state.pause, thread).isPaused;
+}
+
+export function getIsCurrentThreadPaused(state) {
+  return getIsPaused(state, getCurrentThread(state));
+}
+
+export function isEvaluatingExpression(state, thread) {
+  return getThreadPauseState(state.pause, thread).command === "expression";
+}
+
+export function getIsWaitingOnBreak(state, thread) {
+  return getThreadPauseState(state.pause, thread).isWaitingOnBreak;
+}
+
+export function getShouldPauseOnDebuggerStatement(state) {
+  return state.pause.shouldPauseOnDebuggerStatement;
+}
+
+export function getShouldPauseOnExceptions(state) {
+  return state.pause.shouldPauseOnExceptions;
+}
+
+export function getShouldPauseOnCaughtExceptions(state) {
+  return state.pause.shouldPauseOnCaughtExceptions;
+}
+
+export function getFrames(state, thread) {
+  const { frames, framesLoading } = getThreadPauseState(state.pause, thread);
+  return framesLoading ? null : frames;
+}
+
+export const getCurrentThreadFrames = createSelector(
+  state => {
+    const { frames, framesLoading } = getThreadPauseState(
+      state.pause,
+      getCurrentThread(state)
+    );
+    if (framesLoading) {
+      return [];
+    }
+    return frames;
+  },
+  getBlackBoxRanges,
+  (frames, blackboxedRanges) => {
+    return frames.filter(frame => !isFrameBlackBoxed(frame, blackboxedRanges));
+  }
+);
+
+function getGeneratedFrameId(frameId) {
+  if (frameId.includes("-originalFrame")) {
+    // The mapFrames can add original stack frames -- get generated frameId.
+    return frameId.substr(0, frameId.lastIndexOf("-originalFrame"));
+  }
+  return frameId;
+}
+
+export function getGeneratedFrameScope(state, frame) {
+  if (!frame) {
+    return null;
+  }
+  return getFrameScopes(state, frame.thread).generated[
+    getGeneratedFrameId(frame.id)
+  ];
+}
+
+export function getOriginalFrameScope(state, frame) {
+  if (!frame) {
+    return null;
+  }
+  // Only compute original scope if we are currently showing an original source.
+  const source = getSelectedSource(state);
+  if (!source || !source.isOriginal) {
+    return null;
+  }
+
+  const original = getFrameScopes(state, frame.thread).original[
+    getGeneratedFrameId(frame.id)
+  ];
+
+  if (original && (original.pending || original.scope)) {
+    return original;
+  }
+
+  return null;
+}
+
+// This is only used by tests
+export function getFrameScopes(state, thread) {
+  return getThreadPauseState(state.pause, thread).frameScopes;
+}
+
+export function getSelectedFrameBindings(state, thread) {
+  const scopes = getFrameScopes(state, thread);
+  const selectedFrameId = getSelectedFrameId(state, thread);
+  if (!scopes || !selectedFrameId) {
+    return null;
+  }
+
+  const frameScope = scopes.generated[selectedFrameId];
+  if (!frameScope || frameScope.pending) {
+    return null;
+  }
+
+  let currentScope = frameScope.scope;
+  let frameBindings = [];
+  while (currentScope && currentScope.type != "object") {
+    if (currentScope.bindings) {
+      const bindings = Object.keys(currentScope.bindings.variables);
+      const args = [].concat(
+        ...currentScope.bindings.arguments.map(argument =>
+          Object.keys(argument)
+        )
+      );
+
+      frameBindings = [...frameBindings, ...bindings, ...args];
+    }
+    currentScope = currentScope.parent;
+  }
+
+  return frameBindings;
+}
+
+function getFrameScope(state, frame) {
+  return (
+    getOriginalFrameScope(state, frame) || getGeneratedFrameScope(state, frame)
+  );
+}
+
+// This is only used by tests
+export function getSelectedScope(state, thread) {
+  const frame = getSelectedFrame(state, thread);
+
+  const frameScope = getFrameScope(state, frame);
+  if (!frameScope) {
+    return null;
+  }
+
+  return frameScope.scope || null;
+}
+
+export function getSelectedOriginalScope(state, thread) {
+  const frame = getSelectedFrame(state, thread);
+  return getOriginalFrameScope(state, frame);
+}
+
+export function getSelectedScopeMappings(state, thread) {
+  const frameId = getSelectedFrameId(state, thread);
+  if (!frameId) {
+    return null;
+  }
+
+  return getFrameScopes(state, thread).mappings[frameId];
+}
+
+export function getSelectedFrameId(state, thread) {
+  return getThreadPauseState(state.pause, thread).selectedFrameId;
+}
+
+export function isTopFrameSelected(state, thread) {
+  const selectedFrameId = getSelectedFrameId(state, thread);
+  const topFrame = getTopFrame(state, thread);
+  return selectedFrameId == topFrame?.id;
+}
+
+export function getTopFrame(state, thread) {
+  const frames = getFrames(state, thread);
+  return frames?.[0];
+}
+
+// getTopFrame wouldn't return the top frame if the frames are still being fetched
+export function getCurrentlyFetchedTopFrame(state, thread) {
+  const { frames } = getThreadPauseState(state.pause, thread);
+  return frames?.[0];
+}
+
+export function hasFrame(state, frame) {
+  // Don't use getFrames as it returns null when the frames are still loading
+  const { frames } = getThreadPauseState(state.pause, frame.thread);
+  if (!frames) {
+    return false;
+  }
+  // Compare IDs and not frame objects as they get cloned during mapping
+  return frames.some(f => f.id == frame.id);
+}
+
+export function getSkipPausing(state) {
+  return state.pause.skipPausing;
+}
+
+export function isMapScopesEnabled(state) {
+  return state.pause.mapScopes;
+}
+
+export function getInlinePreviews(state, thread, frameId) {
+  return getThreadPauseState(state.pause, thread).inlinePreview[
+    getGeneratedFrameId(frameId)
+  ];
+}
+
+// This is only used by tests
+export function getSelectedInlinePreviews(state) {
+  const thread = getCurrentThread(state);
+  const frameId = getSelectedFrameId(state, thread);
+  if (!frameId) {
+    return null;
+  }
+
+  return getInlinePreviews(state, thread, frameId);
+}
+
+export function getLastExpandedScopes(state, thread) {
+  return getThreadPauseState(state.pause, thread).lastExpandedScopes;
+}