openethereum/js/packages/dapp-console/Input/input.store.js

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
import { action, observable } from 'mobx';
import store from 'store';
import AutocompleteStore from '../Autocomplete/autocomplete.store';
import ConsoleStore from '../Console/console.store';
const LS_HISTORY_KEY = '_console::history';
const MAX_HISTORY_LINES = 5;
let instance;
export default class InputStore {
@observable input = '';
autocompleteStore = AutocompleteStore.get();
consoleStore = ConsoleStore.get();
history = [];
historyOffset = null;
inputNode = null;
lastInput = '';
constructor () {
this.loadHistory();
}
static get () {
if (!instance) {
instance = new InputStore();
}
return instance;
}
setInputNode (node) {
this.inputNode = node;
this.autocompleteStore.setInputNode(node);
}
@action
updateInput (nextValue = '', updateAutocomplete = true) {
this.input = nextValue;
const multilines = nextValue.split('\n').length > 1;
if (updateAutocomplete && !multilines) {
this.autocompleteStore.update(nextValue);
}
}
selectHistory (_offset) {
// No history
if (this.history.length === 0) {
return;
}
if (this.historyOffset === null) {
// Can't go down if no history selected
if (_offset === 1) {
return;
}
this.historyOffset = this.history.length - 1;
this.lastInput = this.input;
return this.updateInput(this.history[this.historyOffset], false);
}
if (_offset === 1 && this.historyOffset === this.history.length - 1) {
this.historyOffset = null;
return this.updateInput(this.lastInput);
}
this.historyOffset = Math.max(0, this.historyOffset + _offset);
const nextInput = this.history[this.historyOffset];
this.updateInput(nextInput, false);
}
execute () {
const { input } = this;
this.pushToHistory(input);
this.consoleStore.evaluate(input);
this.updateInput('');
this.historyOffset = null;
this.autocompleteStore.clearCache();
}
pushToHistory (input) {
// Don't stack twice the same input in
// history
if (this.history[this.history.length - 1] !== input) {
this.history.push(input);
}
this.saveHistory();
}
loadHistory () {
this.history = store.get(LS_HISTORY_KEY) || [];
}
saveHistory () {
if (this.history.length > MAX_HISTORY_LINES) {
this.history = this.history.slice(-1 * MAX_HISTORY_LINES);
}
store.set(LS_HISTORY_KEY, this.history.slice());
}
}