1 files changed, 29 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/selectors/expressions.js b/devtools/client/debugger/src/selectors/expressions.js
new file mode 100644
index 0000000000..085aa63033
--- /dev/null
+++ b/devtools/client/debugger/src/selectors/expressions.js
@@ -0,0 +1,29 @@
+/* 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 { createSelector } from "devtools/client/shared/vendor/reselect";
+
+const getExpressionsWrapper = state => state.expressions;
+
+export const getExpressions = createSelector(
+  getExpressionsWrapper,
+  expressions => expressions.expressions
+);
+
+const getAutocompleteMatches = createSelector(
+  getExpressionsWrapper,
+  expressions => expressions.autocompleteMatches
+);
+
+export function getExpression(state, input) {
+  return getExpressions(state).find(exp => exp.input == input);
+}
+
+export function getAutocompleteMatchset(state) {
+  const input = state.expressions.currentAutocompleteInput;
+  if (!input) {
+    return null;
+  }
+  return getAutocompleteMatches(state)[input];
+}