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createStoreFactory.js
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59 lines (49 loc) · 1.69 KB
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import { createPatchFromMutations } from '../util/getset'
import { isFunction } from '../util/is'
export default function createStoreFactory(applyPatchFunction) {
return function createStore(state) {
const listeners = new Map()
function subscribe(listener, filter) {
listeners.set(listener, filter)
return () => unsubscribe(listener) // This has become a kind of standard
}
function unsubscribe(listener) {
listeners.delete(listener)
}
function applyPatch(patch_original) {
const { mutations, result, unpatch } = applyPatchFunction(
api.state,
patch_original
)
api.state = result
const outputs = Array.from(listeners.entries()).map(
([listener, filter]) => {
const mts = isFunction(filter)
? mutations.filter(filter)
: mutations.slice(0)
const { patch, unpatch } = createPatchFromMutations(
mts,
patch_original
)
return {
listener,
patch,
unpatch,
mutations: mts,
}
}
)
outputs.mutations = mutations
outputs.unpatch = unpatch
return outputs
}
const api = {
state,
listeners,
subscribe,
unsubscribe,
applyPatch,
}
return api
}
}