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import queryString from "query-string";
import isEqual from "lodash/isEqual";
/**
* Maps the state of the application to the history API.
* This is used to make the current view linkable.
* In the URL, the hash part is **reserved for line numbers**.
* (line number links are not implemented yet.)
*/
class State {
/**
* Loads the state from URL.
*
* Prepares event listeners.
*/
constructor() {
const params = queryString.parse(location.search);
const {history} = window;
// Loads from params in URL, then history in order of importance.
this.params = Object.assign({}, params, history.state);
window.onpopstate = (e) => this.handle_popstate(e);
}
handle_popstate(e) {
console.log(e);
const {state} = e;
if (state) {
this.set_state(state, {push: false});
if (this.on_state_change) {
this.on_state_change(state);
}
}
}
set_state(new_state, {push} = {push: true}) {
const {history} = window;
const params = Object.assign({}, this.params, new_state);
Object.keys(params).forEach((k) => {
if (!params[k]) {
Reflect.deleteProperty(params, k);
}
});
if (isEqual(params, this.params)) {
// set_state won't fire on "identity" change.
return;
}
this.params = params;
if (push) {
history.pushState(this.params, "", `?${queryString.stringify(params)}`);
}
}
}
export default State;
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