setExpression(expressionText) {
const { error, expression } = parse(expressionText);
if (error) {
this.setState({
expressionText,
rnpExpression: [],
steps: [],
error,
value: null
});
return;
}
const rnpExpression = convert.toRpn(expression);
const newHistory = this.state.historyList.filter((item) => item.expressionText !== expressionText);
const value = solve(rnpExpression);
newHistory.unshift({
expressionText,
timestamp: new Date().toLocaleTimeString()
});
this.setState({
expressionText,
rnpExpression,
steps: steps(rnpExpression),
error: '',
value,
historyList: newHistory
});
}
setRandom() {
const { maximum, minimum, complexity } = this.state;
let value = maximum + 1;
let expression = '';
while (minimum > value || value > maximum) {
expression = generate(complexity).join('');
value = solve(convert.toRpn(parse(expression).expression));
}
this.setExpression(expression);
}