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feat(annotations): Handle annotations staged change event #1247

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merged 7 commits into from
Sep 9, 2020
Merged

feat(annotations): Handle annotations staged change event #1247

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7f8a098
feat(annotations): Handle annotations staged change event
Sep 9, 2020
d6f6f98
feat(annotations): AnnotationControls dumber, FSM smarter
Sep 9, 2020
6118793
feat(annotations): Address comments
Sep 9, 2020
fa98114
feat(annotations): Add FSM unit tests
Sep 9, 2020
d31e134
feat(annotations): More unit tests
Sep 9, 2020
b786d05
feat(annotations): Add tests for every possible inputs for every state
Sep 9, 2020
4828358
feat(annotations): Address comments
Sep 9, 2020
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6 changes: 6 additions & 0 deletions src/lib/AnnotationControlsFSM.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,12 @@ export const stateModeMap = {
export default class AnnotationControlsFSM {
private currentState = AnnotationState.NONE;

public getState = (): AnnotationState => this.currentState;

public setState = (state: AnnotationState): void => {
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this.currentState = state;
};

public transition = (input: AnnotationInput, mode: AnnotationMode = AnnotationMode.NONE): AnnotationMode => {
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Having mode default to none seems ripe for bugs to be introduced. Would it work if it was just optionally undefined?

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The state in FSM cannot be undefined, so if mode is undefined and state transition depends on mode, the state has to be none which is the same as default mode to none.

if (input === AnnotationInput.CLICK) {
this.currentState = mode === stateModeMap[this.currentState] ? AnnotationState.NONE : modeStateMap[mode];
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90 changes: 90 additions & 0 deletions src/lib/__tests__/AnnotationControlsFSM-test.js
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@@ -0,0 +1,90 @@
import AnnotationControlsFSM, { AnnotationInput, AnnotationState } from '../AnnotationControlsFSM';
import { AnnotationMode } from '../AnnotationControls';

let annotationControlsFSM;

describe('lib/AnnotationControlsFSM', () => {
beforeEach(() => {
annotationControlsFSM = new AnnotationControlsFSM();
});

[
{
state: AnnotationState.NONE,
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input: AnnotationInput.CLICK,
mode: AnnotationMode.HIGHLIGHT,
nextState: AnnotationState.HIGHLIGHT,
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Does nextState and output ever differ?

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nextState could be highlight_temp and output is highlight

output: AnnotationMode.HIGHLIGHT,
},
{
state: AnnotationState.NONE,
input: AnnotationInput.CLICK,
mode: AnnotationMode.REGION,
nextState: AnnotationState.REGION,
output: AnnotationMode.REGION,
},
{
state: AnnotationState.NONE,
input: AnnotationInput.CREATE,
mode: AnnotationMode.HIGHLIGHT,
nextState: AnnotationState.HIGHLIGHT_TEMP,
output: AnnotationMode.HIGHLIGHT,
},
{
state: AnnotationState.NONE,
input: AnnotationInput.CREATE,
mode: AnnotationMode.REGION,
nextState: AnnotationState.REGION_TEMP,
output: AnnotationMode.REGION,
},
{
state: AnnotationState.HIGHLIGHT,
input: AnnotationInput.CANCEL,
mode: AnnotationMode.HIGHLIGHT,
nextState: AnnotationState.HIGHLIGHT,
output: AnnotationMode.HIGHLIGHT,
},
{
state: AnnotationState.HIGHLIGHT,
input: AnnotationInput.SUCCESS,
mode: undefined,
nextState: AnnotationState.HIGHLIGHT,
output: AnnotationMode.HIGHLIGHT,
},
{
state: AnnotationState.HIGHLIGHT_TEMP,
input: AnnotationInput.CLICK,
mode: AnnotationMode.HIGHLIGHT,
nextState: AnnotationState.NONE,
output: AnnotationMode.NONE,
},
{
state: AnnotationState.HIGHLIGHT_TEMP,
input: AnnotationInput.CLICK,
mode: AnnotationMode.REGION,
nextState: AnnotationState.REGION,
output: AnnotationMode.REGION,
},
{
state: AnnotationState.HIGHLIGHT_TEMP,
input: AnnotationInput.CANCEL,
mode: AnnotationMode.HIGHLIGHT,
nextState: AnnotationState.NONE,
output: AnnotationMode.NONE,
},
{
state: AnnotationState.HIGHLIGHT_TEMP,
input: AnnotationInput.SUCCESS,
mode: undefined,
nextState: AnnotationState.NONE,
output: AnnotationMode.NONE,
},
].forEach(({ state, input, mode, nextState, output }) => {
it(`should go to state ${nextState} and output ${output}`, () => {
annotationControlsFSM.setState(state);

expect(annotationControlsFSM.transition(input, mode)).to.equal(output);
expect(annotationControlsFSM.getState()).to.equal(nextState);
});
});
});