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author | Shin'ya Ueoka <ueokande@i-beam.org> | 2021-04-12 13:09:09 +0000 |
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committer | GitHub <noreply@github.com> | 2021-04-12 13:09:09 +0000 |
commit | d80d0f87b82ba4bd74ed9b2bb7354421a28a11b3 (patch) | |
tree | 691185ad88418d0f44c236d0913cf5c425b29b23 /src/console/completion/reducer.ts | |
parent | ea73c900f66107fd4a5b2f3b05080bcf643c94ea (diff) | |
parent | 8a5bba1da639355a25da8c279a9f1cf0a7300a9f (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.ts | 96 |
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; + } +} |