private void GetUnaryExpression()
{
var token = _lexer.LookAheadToken();
if (token.Type == Token.EType.UNARYMINUS)
{
_lexer.Advance();
}
GetAtomicValue();
if (token.Type == Token.EType.UNARYMINUS)
{
_compilerEnvironment.AddInstruction(new UnaryMinusInstruction());
}
}