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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2021, Max Wipfli <mail@maxwipfli.ch>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Keypad.h"
#include "KeypadValue.h"
#include <AK/Math.h>
#include <AK/StringBuilder.h>
Keypad::Keypad()
{
}
Keypad::~Keypad()
{
}
void Keypad::type_digit(int digit)
{
u64 previous_value = 0;
switch (m_state) {
case State::External:
m_state = State::TypingInteger;
m_negative = false;
m_int_value = digit;
m_frac_value = 0;
m_frac_length = 0;
break;
case State::TypingInteger:
VERIFY(m_frac_value.value() == 0);
VERIFY(m_frac_length == 0);
previous_value = m_int_value.value();
m_int_value *= 10;
m_int_value += digit;
if (m_int_value.has_overflow())
m_int_value = previous_value;
break;
case State::TypingDecimal:
previous_value = m_frac_value.value();
m_frac_value *= 10;
m_frac_value += digit;
if (m_frac_value.has_overflow())
m_frac_value = previous_value;
else
m_frac_length++;
break;
}
}
void Keypad::type_decimal_point()
{
switch (m_state) {
case State::External:
m_negative = false;
m_int_value = 0;
m_frac_value = 0;
m_frac_length = 0;
m_state = State::TypingDecimal;
break;
case State::TypingInteger:
VERIFY(m_frac_value.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_negative = false;
m_int_value = 0;
m_frac_value = 0;
m_frac_length = 0;
break;
case State::TypingDecimal:
if (m_frac_length > 0) {
m_frac_value /= 10;
m_frac_length--;
break;
}
VERIFY(m_frac_value.value() == 0);
m_state = State::TypingInteger;
[[fallthrough]];
case State::TypingInteger:
VERIFY(m_frac_value.value() == 0);
VERIFY(m_frac_length == 0);
m_int_value /= 10;
if (m_int_value.value() == 0)
m_negative = false;
break;
}
}
KeypadValue Keypad::value() const
{
KeypadValue frac_part = { (i64)m_frac_value.value(), m_frac_length };
KeypadValue int_part = { (i64)m_int_value.value() };
KeypadValue res = int_part + frac_part;
if (m_negative)
res = -res;
return res;
}
void Keypad::set_value(KeypadValue value)
{
m_state = State::External;
if (value.m_value < 0) {
m_negative = true;
value = -value;
} else
m_negative = false;
m_int_value = value.m_value / (u64)AK::pow(10.0, (double)value.m_decimal_places);
m_frac_value = value.m_value % (u64)AK::pow(10.0, (double)value.m_decimal_places);
m_frac_length = value.m_decimal_places;
}
String Keypad::to_string() const
{
StringBuilder builder;
if (m_negative)
builder.append("-");
builder.appendff("{}", m_int_value.value());
// NOTE: This is so the decimal point appears on screen as soon as you type it.
if (m_frac_length > 0 || m_state == State::TypingDecimal)
builder.append('.');
if (m_frac_length > 0) {
// FIXME: This disables the compiletime format string check since we can't parse '}}' here correctly.
// remove the 'StringView { }' when that's fixed.
builder.appendff("{:0{}}"sv, m_frac_value.value(), m_frac_length);
}
return builder.to_string();
}
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