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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Keypad.h"
#include <AK/StringBuilder.h>
#include <LibCrypto/BigFraction/BigFraction.h>
#include <LibCrypto/BigInt/UnsignedBigInteger.h>
#include <LibCrypto/NumberTheory/ModularFunctions.h>
void Keypad::type_digit(int digit)
{
switch (m_state) {
case State::External:
m_state = State::TypingInteger;
m_int_value = digit;
m_frac_value.set_to_0();
m_frac_length.set_to_0();
break;
case State::TypingInteger:
VERIFY(m_frac_value == 0);
VERIFY(m_frac_length == 0);
m_int_value.set_to(m_int_value.multiplied_by(10));
m_int_value.set_to(m_int_value.plus(digit));
break;
case State::TypingDecimal:
m_frac_value.set_to(m_frac_value.multiplied_by(10));
m_frac_value.set_to(m_frac_value.plus(digit));
m_frac_length.set_to(m_frac_length.plus(1));
break;
}
}
void Keypad::type_decimal_point()
{
switch (m_state) {
case State::External:
m_int_value.set_to_0();
m_frac_value.set_to_0();
m_frac_length.set_to_0();
m_state = State::TypingDecimal;
break;
case State::TypingInteger:
VERIFY(m_frac_value == 0);
VERIFY(m_frac_length == 0);
m_state = State::TypingDecimal;
break;
case State::TypingDecimal:
// Ignore it.
break;
}
}
void Keypad::type_backspace()
{
switch (m_state) {
case State::External:
m_int_value.set_to_0();
m_frac_value.set_to_0();
m_frac_length.set_to_0();
break;
case State::TypingDecimal:
if (m_frac_length > 0) {
m_frac_value.set_to(m_frac_value.divided_by(10).quotient);
m_frac_length.set_to(m_frac_length.minus(1));
break;
}
VERIFY(m_frac_value == 0);
m_state = State::TypingInteger;
[[fallthrough]];
case State::TypingInteger:
VERIFY(m_frac_value == 0);
VERIFY(m_frac_length == 0);
m_int_value.set_to(m_int_value.divided_by(10).quotient);
break;
}
}
Crypto::BigFraction Keypad::value() const
{
if (m_state != State::External) {
Crypto::SignedBigInteger sum { m_int_value.multiplied_by(Crypto::NumberTheory::Power("10"_bigint, m_frac_length)).plus(m_frac_value) };
Crypto::BigFraction res { move(sum), Crypto::NumberTheory::Power("10"_bigint, m_frac_length) };
m_internal_value = move(res);
}
return m_internal_value;
}
void Keypad::set_value(Crypto::BigFraction value)
{
m_state = State::External;
m_internal_value = move(value);
}
void Keypad::set_to_0()
{
m_int_value.set_to_0();
m_frac_value.set_to_0();
m_frac_length.set_to_0();
m_internal_value.set_to_0();
m_state = State::External;
}
String Keypad::to_string() const
{
// TODO: Implement custom rounding length in the calculator.
constexpr auto maximum_precision = 6;
if (m_state == State::External)
return m_internal_value.to_string(maximum_precision);
StringBuilder builder;
String const integer_value = m_int_value.to_base(10);
String const frac_value = m_frac_value.to_base(10);
unsigned const number_pre_zeros = m_frac_length.to_u64() - (frac_value.length() - 1) - (frac_value == "0" ? 0 : 1);
builder.append(integer_value);
// NOTE: We test for the state so the decimal point appears on screen as soon as you type it.
if (m_state == State::TypingDecimal) {
builder.append('.');
builder.append_repeated('0', number_pre_zeros);
if (frac_value != "0")
builder.append(frac_value);
}
return builder.to_string();
}
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