Conversions from bases 0-16, 2CP, BCD
EmaMaker
parent
303094d6dc
commit
99f517d0ba
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@ -0,0 +1,144 @@
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import 'dart:math';
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String decimalToBase(int number, toBase) {
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//current base as integer
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String tmpBase = toBase.toUpperCase();
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if (tmpBase == "HEX") tmpBase = "16";
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bool negative = number < 0;
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if (negative) number *= -1;
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String res = "";
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switch (tmpBase) {
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case "BCD":
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String n = number.toString();
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for (int i = 0; i < n.length; i++) {
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String digit = decimalToBase(int.parse(n[i]), "2");
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int missingZeros = 4 - digit.length;
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for (int i = 0; i < missingZeros; i++) {
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digit = "0" + digit;
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}
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res += digit;
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}
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if (negative) res = "-" + res;
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break;
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case "2CP":
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String binary = decimalToBase(number, 2);
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bool gotOne = false;
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if (negative) {
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for (int i = 0; i < binary.length; i++) {
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if (gotOne) {
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if (binary[i] == "1")
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binary[i] == "0";
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else
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binary[i] == "1";
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} else {
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if (binary[i] == "1") gotOne = true;
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}
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}
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res = binary;
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} else {
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res = "0" + binary;
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}
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break;
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default:
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int base = int.parse(tmpBase); //current base as integer
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List<int> digits = [];
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while (number != 0) {
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digits.add(number % base);
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number = number ~/ base;
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}
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digits = digits.reversed.toList();
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for (int i = 0; i < digits.length; i++) {
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if (digits[i] >= 10) {
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res += String.fromCharCode(digits[i] + 55);
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} else {
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res += digits[i].toString();
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}
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}
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if (negative) res = "-" + res;
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break;
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}
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return res;
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}
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String baseToDecimal(String number, String pBase) {
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bool negative = number.startsWith('-');
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if (negative) number = number.split('-')[1];
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//current base as integer
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String tmpBase = pBase.toUpperCase();
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if (tmpBase == "HEX") tmpBase = "16";
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String cBase = tmpBase;
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if (cBase == "BCD" || cBase == "2CP") cBase = "2";
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int controlBase = int.parse(cBase);
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for (int i = 0; i < number.length; i++) {
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if (charToDigit(number, i) >= controlBase) {
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return "error-invalid-number-for-base";
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}
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}
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String res = "";
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switch (tmpBase) {
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case "BCD":
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int missingZeros = (4 - number.length % 4) % 4;
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for (int i = 0; i < missingZeros; i++) number = "0" + number;
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for (int i = 0; i < number.length; i += 4) {
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String n = number[i];
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n += number[i + 1];
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n += number[i + 2];
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n += number[i + 3];
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String n1 = baseToDecimal(n, "2");
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print(n1);
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if (int.parse(n1) > 9) return "error-bcd-greater-nine";
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res += n1;
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}
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break;
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case "2CP":
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if (negative) {
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return "error-negative-cp2";
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}
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int dres = 0;
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number = number.split('').reversed.join('').toString();
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for (int i = 0; i < number.length; i++) {
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int add = int.parse(number[i]) * pow(2, i).toInt();
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if (i == number.length - 1) add *= -1;
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dres += add;
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}
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res = dres.toString();
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break;
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default:
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int base = int.parse(tmpBase);
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List<int> digits = [];
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// Get the value in decimal of the current digit
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for (int i = 0; i < number.length; i++) {
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int digit = charToDigit(number, i);
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digits.add(digit);
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}
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//Reverse the list
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digits = digits.reversed.toList();
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int dres = 0;
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for (int i = 0; i < digits.length; i++) {
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dres += digits[i] * pow(base, i).toInt();
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}
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res = dres.toString();
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break;
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}
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return res;
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}
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int charToDigit(String s, int i) {
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return isDigit(s, i) ? int.parse(s[i]) : s.codeUnitAt(i) - 55;
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}
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// https://stackoverflow.com/questions/25872456/dart-what-is-the-fastest-way-to-check-if-a-particular-symbol-in-a-string-is-a-d
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bool isDigit(String s, int i) => (s.codeUnitAt(i) ^ 0x30) <= 9;
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181
lib/main.dart
181
lib/main.dart
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@ -1,4 +1,7 @@
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/widgets.dart';
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import 'package:base_converter/calculations.dart';
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void main() {
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runApp(const MyApp());
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@ -13,15 +16,6 @@ class MyApp extends StatelessWidget {
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return MaterialApp(
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title: 'Base Converter',
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theme: ThemeData(
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// This is the theme of your application.
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//
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// Try running your application with "flutter run". You'll see the
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// application has a blue toolbar. Then, without quitting the app, try
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// changing the primarySwatch below to Colors.green and then invoke
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// "hot reload" (press "r" in the console where you ran "flutter run",
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// or simply save your changes to "hot reload" in a Flutter IDE).
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// Notice that the counter didn't reset back to zero; the application
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// is not restarted.
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primarySwatch: Colors.blue,
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),
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home: const MyHomePage(),
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@ -37,9 +31,8 @@ class MyHomePage extends StatefulWidget {
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}
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class _MyHomePageState extends State<MyHomePage> {
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String fromBase = "One";
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String toBase = "One";
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String fromBase = "2", savedFromBase = "";
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String toBase = "10", savedToBase = "";
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String result = "";
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late TextEditingController _controller;
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@ -53,7 +46,9 @@ class _MyHomePageState extends State<MyHomePage> {
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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return GestureDetector(
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onTap: () => hidekbd,
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child: Scaffold(
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appBar: AppBar(
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title: const Text("Base Converter"),
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actions: [
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@ -83,13 +78,14 @@ class _MyHomePageState extends State<MyHomePage> {
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icon: const Icon(Icons.info_outline_rounded))
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],
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),
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body: SafeArea(
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child: Container(
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body: Container(
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margin: const EdgeInsets.fromLTRB(24, 32, 24, 32),
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child: Column(children: [
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mainBody(),
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Expanded(
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child: Center(child: richText),
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child: Container(
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margin: const EdgeInsets.all(24),
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child: Center(child: resultToRichText())),
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)
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]),
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),
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@ -110,11 +106,11 @@ class _MyHomePageState extends State<MyHomePage> {
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TextField(
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controller: _controller,
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decoration: const InputDecoration(hintText: "Number "),
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keyboardType: TextInputType.phone,
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),
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Row(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
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baseSelector("From:", fromBase),
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baseSelector("To:", toBase)
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]),
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Row(
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mainAxisAlignment: MainAxisAlignment.spaceBetween,
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children: [baseSelector("From:", 0), baseSelector("To:", 1)]),
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Row(children: [
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Expanded(
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child: TextButton(
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@ -131,13 +127,74 @@ class _MyHomePageState extends State<MyHomePage> {
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);
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}
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void calculate() {}
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void hidekbd() {
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FocusManager.instance.primaryFocus?.unfocus();
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}
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void decimalToBase() {}
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RichText resultToRichText() {
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switch (result) {
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case "error-negative-in-cp2":
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return errorString("Error: 2CP number can't have a negative sign");
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case "error-bcd-greater-nine":
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return errorString("Error: BCD can only code digits from 0 to 9");
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case "error-invalid-number-for-base":
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return errorString(
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"Error: a digit is greater than or equal to the base");
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case "":
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return RichText(
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text: TextSpan(
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text: '',
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style: DefaultTextStyle.of(context).style,
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children: const <TextSpan>[],
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),
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);
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default:
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return RichText(
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text: TextSpan(
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text: '',
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style: DefaultTextStyle.of(context).style,
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children: <TextSpan>[
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mainNumber(_controller.text),
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baseSubtitle("($savedFromBase)"),
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mainNumber(" = $result"),
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baseSubtitle("($savedToBase)"),
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],
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),
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);
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}
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}
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void baseToDecimal() {}
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RichText errorString(String content) {
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return RichText(
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text: TextSpan(
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text: '',
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style: DefaultTextStyle.of(context).style,
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children: <TextSpan>[
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TextSpan(
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text: content,
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style: const TextStyle(
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color: Colors.black,
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fontSize: 12,
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fontWeight: FontWeight.normal,
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fontFamily: "Roboto")),
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],
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),
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);
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}
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Container baseSelector(String labelText, String value) {
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TextSpan mainNumber(String text) {
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return TextSpan(
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text: text,
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style: const TextStyle(
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color: Colors.black, fontSize: 18, fontWeight: FontWeight.bold));
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}
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TextSpan baseSubtitle(String text) {
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return TextSpan(
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text: text, style: const TextStyle(color: Colors.black, fontSize: 14));
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}
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Container baseSelector(String labelText, int i) {
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return Container(
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margin: const EdgeInsets.all(4),
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child: Row(
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@ -147,17 +204,10 @@ class _MyHomePageState extends State<MyHomePage> {
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const SizedBox(
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width: 10,
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),
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dpb(value),
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],
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),
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);
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}
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DropdownButton dpb(String dropdownValue) {
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return DropdownButton<String>(
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value: dropdownValue,
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DropdownButton<String>(
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value: i == 0 ? fromBase : toBase,
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icon: const Icon(Icons.arrow_downward),
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iconSize: 24,
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iconSize: 16,
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elevation: 16,
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style: const TextStyle(color: Colors.deepPurple),
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underline: Container(
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@ -166,34 +216,55 @@ class _MyHomePageState extends State<MyHomePage> {
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),
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onChanged: (String? newValue) {
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setState(() {
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dropdownValue = newValue!;
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if (i == 0) {
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fromBase = newValue!;
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} else if (i == 1) {
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toBase = newValue!;
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}
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});
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},
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items: <String>[
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'One',
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'Two',
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'Three',
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'Four',
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'Five',
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'Six',
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'Seven',
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'Eight',
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'Nine',
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'Ten',
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'Eleven',
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'Twelve',
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'Thirteen',
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'Fourteen',
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'Fifteen',
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'Hex',
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'BCD',
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'2\'s CP'
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].map<DropdownMenuItem<String>>((String value) {
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items: items.map<DropdownMenuItem<String>>((String value) {
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return DropdownMenuItem<String>(
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value: value,
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child: Text(value),
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);
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}).toList(),
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),
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],
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),
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);
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}
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List<String> items = <String>[
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'1',
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'2',
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'3',
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'4',
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'5',
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'6',
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'7',
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'8',
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'9',
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'10',
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'11',
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'12',
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'13',
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'14',
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'15',
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'Hex',
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'BCD',
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"2CP"
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];
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void calculate() {
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setState(() {
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hidekbd();
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savedFromBase = fromBase;
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savedToBase = toBase;
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String s = baseToDecimal(_controller.text.toUpperCase(), savedFromBase);
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if (!s.startsWith("error")) s = decimalToBase(int.parse(s), savedToBase);
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result = s;
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});
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}
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}
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