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authorShin'ya Ueoka <ueokande@i-beam.org>2021-04-12 13:09:09 +0000
committerGitHub <noreply@github.com>2021-04-12 13:09:09 +0000
commitd80d0f87b82ba4bd74ed9b2bb7354421a28a11b3 (patch)
tree691185ad88418d0f44c236d0913cf5c425b29b23 /src/console/completion/reducer.ts
parentea73c900f66107fd4a5b2f3b05080bcf643c94ea (diff)
parent8a5bba1da639355a25da8c279a9f1cf0a7300a9f (diff)
Merge pull request #1098 from ueokande/replace-redux-with-react-hooks
Refactor state management with React Hooks on Console
Diffstat (limited to 'src/console/completion/reducer.ts')
-rw-r--r--src/console/completion/reducer.ts96
1 files changed, 96 insertions, 0 deletions
diff --git a/src/console/completion/reducer.ts b/src/console/completion/reducer.ts
new file mode 100644
index 0000000..905451f
--- /dev/null
+++ b/src/console/completion/reducer.ts
@@ -0,0 +1,96 @@
+import Completions from "../Completions";
+import CompletionType from "../../shared/CompletionType";
+import {
+ INIT_COMPLETIONS,
+ SET_COMPLETION_SOURCE,
+ SET_COMPLETIONS,
+ COMPLETION_NEXT,
+ COMPLETION_PREV,
+ CompletionAction,
+} from "./actions";
+
+export interface State {
+ completionTypes?: CompletionType[];
+ completionSource: string;
+ completions: Completions;
+ select: number;
+}
+
+export const defaultState = {
+ completionTypes: undefined,
+ completionSource: "",
+ completions: [],
+ select: -1,
+};
+
+const nextSelection = (state: State): number => {
+ const length = state.completions
+ .map((g) => g.items.length)
+ .reduce((x, y) => x + y, 0);
+ if (length === 0) {
+ return -1;
+ }
+ if (state.select < 0) {
+ return 0;
+ }
+ if (state.select + 1 < length) {
+ return state.select + 1;
+ }
+ return -1;
+};
+
+const prevSelection = (state: State): number => {
+ if (state.completions.length === 0) {
+ return -1;
+ }
+ const length = state.completions
+ .map((g) => g.items.length)
+ .reduce((x, y) => x + y);
+ if (state.select < 0) {
+ return length - 1;
+ }
+ return state.select - 1;
+};
+
+// eslint-disable-next-line max-lines-per-function
+export default function reducer(
+ state: State = defaultState,
+ action: CompletionAction
+): State {
+ switch (action.type) {
+ case INIT_COMPLETIONS:
+ return {
+ ...state,
+ completionTypes: action.completionTypes,
+ completions: [],
+ select: -1,
+ };
+ case SET_COMPLETION_SOURCE:
+ return {
+ ...state,
+ completionSource: action.completionSource,
+ select: -1,
+ };
+ case SET_COMPLETIONS:
+ return {
+ ...state,
+ completions: action.completions,
+ };
+ case COMPLETION_NEXT: {
+ const select = nextSelection(state);
+ return {
+ ...state,
+ select: select,
+ };
+ }
+ case COMPLETION_PREV: {
+ const select = prevSelection(state);
+ return {
+ ...state,
+ select: select,
+ };
+ }
+ default:
+ return state;
+ }
+}