sma

url=https://raw.githubusercontent.com/gunnarmorling/1brc/main/data/weather_stations.csv 

prepare:
	curl -s ${url} | grep -v '^#'  >data2/weather.csv
	dart run bin/prepare.dart 1_000_000 >data2/1m
	dart run bin/prepare.dart 10_000_000 >data2/10m
	dart run bin/prepare.dart 100_000_000 >data2/100m
	dart run bin/prepare.dart 1_000_000_000 >data2/1g  

clean:

sma

/// A simple incomplete WebAssembly interpreter.
library;

import 'dart:io';

void main() {
  // final bytes = File('sum.wasm').readAsBytesSync();
  final module = WasmModule(bytes);
  print(module.exports);
  print(module.invoke('add', [3, 4]));

sma

Add Flutter to an iOS Appplication

1. Create a normal iOS App (using SwiftUI) called SmaApp.
2. Cd into SmaApp.
3. Run pod init and pod install in the SmaApp folder to setup Cocoapods (install it with brew install cocoapods).
4. Add platform :ios, '17.0' to Podfile.
5. Add Pods folder to .gitignore: echo Pods/ >.gitignore.
6. Reopen the project using open SmaApp.xcworkspace.
7. Build & run to make sure everything works.
8. Run flutter --template module sma_flutter to setup Flutter.
9. Go into sma_flutter and run flutter run (choose iOS if asked for a device).

sma

Wenn man einen 2D ScrollView bauen will…

Ich will eine große Hexkarte bauen. Wenn ich naiv 200x200 Hex-Felder in einem Stack anordne (weil die sich ja überlappen) und den in einen InteractiveViewer packe, dann braucht Flutter 30 Sekunden (!) die 120.000 Widgets zu bauen.

1. Ich muss eine Unterklasse von TwoDimensionalScrollView erstellen, die minimal ein delegate bekommt, der weiß, wie man Kinder baut. Dazu später mehr. Erst mal ist das alles nur boilerplate-Code:

   class HexMapView extends TwoDimensionalScrollView {
     const HexMapView({super.key, required super.delegate})
       : super(diagonalDragBehavior: DiagonalDragBehavior.free);

sma

import 'dart:io';
import 'dart:math';

import 'package:unpak/unpak.dart';

void main(List<String> arguments) {
  if (arguments.length < 2 || !<String>{'-l', '-x'}.contains(arguments[0])) {
    stderr.writeln('usage: unpak -l <file.pak>');
    stderr.writeln('       unpak -x <file.pak> <index> [<output>]');
    exit(1);

sma

import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/error/error.dart';
import 'package:analyzer/error/listener.dart';
import 'package:custom_lint_builder/custom_lint_builder.dart';

class MyLintPlugin extends PluginBase {
  @override
  List<LintRule> getLintRules(CustomLintConfigs configs) {
    return [
      MyLintRule(),

sma

import 'dart:async';
import 'dart:math';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

// ----------------------------------------------------------------------------

class Box<T> {
  Box(this.value);

sma

import 'dart:async';
import 'dart:collection';

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:signals/signals_flutter.dart';

import 'firebase_options.dart';

sma

import 'dart:math';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {

sma

/// Parses a plist file into a Dart object.
dynamic parsePlist(String plist) {
  final tokens = RegExp(r'(\s+|<[!?].*?>)|<(/?\w+)[^>]*>|([^<]*)', dotAll: true)
      .allMatches(plist)
      .where((match) => match[1] == null)
      .map((match) => match[2] != null ? (1, match[2]!) : (2, match[3]!))
      .followedBy([(0, '')]).iterator
    ..moveNext();

  bool at(String s) => tokens.current == (1, s) && tokens.moveNext();