bit_pattern 0.0.1

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Bit sequence matchers for building emulators in Dart.

Creating a pattern

Patterns can be created from a sequence of 0s, 1s and variable length chunks.

// Create a pattern that matches any integer whose most significant byte is
// 0x6 and whose least significant byte is anything.
var pattern = new BitPattern([0, 1, 1, 0, v(4, 'lsb')]); 

The pattern can be used to determine whether an integer uses an equivalent bit sequence.

pattern.matches(0x60); // == true
pattern.matches(0x6F); // == true
pattern.matches(0x50); // == false

Patterns can be put into groups to simplify matching multiple patterns against an integer using a PatternGroup.

var pattern0x1 = new BitPattern([0, 0, 0, 1]);
var pattern0xF = new BitPattern([1, 1, 1, 1]);
var patternGroup = new BitPatternGroup([pattern0x1, pattern0xF]);

patternGroup.match(0x1) == pattern0x1; // true
patternGroup.match(0xF) == pattern0xF; // true
patternGroup.match(0x6) == null;     // true

If there are multiple BitPatterns in a PatternGroup that match some integer, the group with the fewest number of non-variable bits is returned. If two or more matched patterns have an identical number of non-variable bits, then these two patterns are incompatible and a BitPatternException is raised.

var pattern0xE = new BitPattern([0, 1, 1, 1]);
var patternAny1 = new BitPattern([v(4, 'any1')]);
var patternAny2 = new BitPattern([v(4, 'any2')]);
var patternGroup = new BitPatternGroup([patternAny1, pattern0xE, patternAny2]);

patternGroup.match(0xE) == pattern0xE; // true
patternGroup.match(0xF) == patternAny2; // error! Both patternAny1 and patternAny2 match!

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  bit_pattern: ^0.0.1

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:bit_pattern/bit_pattern.dart';
Version Uploaded Documentation Archive
0.0.1 May 22, 2017 Go to the documentation of bit_pattern 0.0.1 Download bit_pattern 0.0.1 archive
0.0.4-alpha May 27, 2017 Go to the documentation of bit_pattern 0.0.4-alpha Download bit_pattern 0.0.4-alpha archive
0.0.3-alpha May 23, 2017 Go to the documentation of bit_pattern 0.0.3-alpha Download bit_pattern 0.0.3-alpha archive
0.0.2-alpha May 22, 2017 Go to the documentation of bit_pattern 0.0.2-alpha Download bit_pattern 0.0.2-alpha archive
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The package version is not analyzed, because it does not support Dart 2. Until this is resolved, the package will receive a health and maintenance score of 0.

Issues and suggestions

Support Dart 2 in pubspec.yaml.

The SDK constraint in pubspec.yaml doesn't allow the Dart 2.0.0 release. For information about upgrading it to be Dart 2 compatible, please see


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.22.0 <2.0.0