duktape/README.md

Duktape
=======

[![Build Status](https://travis-ci.org/svaarala/duktape.svg?branch=master)](https://travis-ci.org/svaarala/duktape)

Introduction
------------

[Duktape](http://duktape.org/) is an **embeddable Javascript** engine,
with a focus on **portability** and **compact** footprint.

Duktape is easy to integrate into a C/C++ project: add `duktape.c`,
`duktape.h`, and `duk_config.h` to your build, and use the Duktape API
to call Ecmascript functions from C code and vice versa.

Main features:

* Embeddable, portable, compact
* Ecmascript E5/E5.1 compliant, with some semantics updated from ES2015+
* Partial support for Ecmascript 2015 (E6) and Ecmascript 2016 (E7),
  [Post-ES5 feature status](http://wiki.duktape.org/PostEs5Features.html)
* ES2015 TypedArray and Node.js Buffer bindings
* WHATWG Encoding API living standard
* Built-in debugger
* Built-in regular expression engine
* Built-in Unicode support
* Minimal platform dependencies
* Combined reference counting and mark-and-sweep garbage collection with finalization
* Custom features like co-routines
* Property virtualization using a subset of Ecmascript E2015 Proxy object
* Bytecode dump/load for caching compiled functions
* Distributable includes an optional logging framework, CommonJS-based module
  loading implementations, etc
* Liberal license

See [duktape.org](http://duktape.org/) for packaged end-user downloads
and documentation.  The end user downloads are also available from the
[duktape-releases](https://github.com/svaarala/duktape-releases) repo
as both binaries and in unpacked form as git tags.  Snapshot builds from
master are available in [duktape.org/snapshots](http://duktape.org/snapshots).

Have fun!

Support
-------

* Duktape Wiki: [wiki.duktape.org](http://wiki.duktape.org)
* User community Q&A: Stack Overflow [duktape](http://stackoverflow.com/questions/tagged/duktape) tag
* Bugs and feature requests: [GitHub issues](https://github.com/svaarala/duktape/issues)
* General discussion: IRC `#duktape` on `chat.freenode.net` ([webchat](https://webchat.freenode.net))

About this repository
---------------------

This repository is **intended for Duktape developers only**, and contains
Duktape internals: test cases, internal documentation, sources for the
duktape.org web site, etc.

Getting started: end user
-------------------------

When embedding Duktape in your application you should use the packaged source
distributables available from [duktape.org/download.html](http://duktape.org/download.html).
See [duktape.org/guide.html#gettingstarted](http://duktape.org/guide.html#gettingstarted)
for the basics.

Automatically generated bleeding edge snapshots from master are available at
[duktape.org/snapshots](http://duktape.org/snapshots).

The distributable `src/` directory contains a `duk_config.h` configuration
header and amalgamated sources for Duktape default configuration.  Use
`python tools/configure.py` to create header and sources for customized
configuration options, see http://wiki.duktape.org/Configuring.html.  For
example, to enable fastint support (example for Linux):

    $ tar xvfJ duktape-2.0.0.tar.xz
    $ cd duktape-2.0.0
    $ rm -rf src-custom
    $ python tools/configure.py \
          --source-directory src-input \
          --output-directory src-custom \
          --config-metadata config \
          -DDUK_USE_FASTINT

    # src-custom/ will now contain: duktape.c, duktape.h, duk_config.h.

You can also clone this repository, make modifications, and build a source
distributable on Linux, OSX, and Windows using `python util/dist.py`.

Getting started: modifying and rebuilding the distributable
-----------------------------------------------------------

If you intend to change Duktape internals and want to rebuild the source
distributable in Linux, OSX, or Windows:

    # Linux; can often install from packages or using 'pip'
    $ sudo apt-get install python python-yaml
    $ python util/dist.py

    # OSX
    # Install Python 2.7.x
    $ pip install PyYAML
    $ python util/dist.py

    # Windows
    ; Install Python 2.7.x from python.org, and add it to PATH
    > pip install PyYAML
    > python util\dist.py

The source distributable directory will be in `dist/`.

For platform specific notes see http://wiki.duktape.org/DevelopmentSetup.html.

Getting started: other development (Linux only)
-----------------------------------------------

Other development stuff, such as building the website and running test cases,
is based on a `Makefile` **intended for Linux only**.  See detailed
instructions in http://wiki.duktape.org/DevelopmentSetup.html.

Branch policy
-------------

* The `master` branch is used for active development.  While pull requests
  are tested before merging, master may be broken from time to time.  When
  development on a new major release starts, master will also get API
  incompatible changes without warning.  For these reasons **you should
  generally not depend on the master branch** for building your project; use
  a release tag or a release maintenance branch instead.

* Pull requests and their related branches are frequently rebased so you
  should not fork off them.  Pull requests may be open for a while for
  testing and discussion.

* Release tags like `v1.4.1` are used for releases and match the released
  distributables.  These are stable once the release is complete.

* Maintenance branches are used for backporting fixes and features for
  maintenance releases.  Documentation changes go to master for maintenance
  releases too.  For example, `v1.5-maintenance` was created for the 1.5.0
  release and is used for 1.5.x maintenance releases.

* A maintenance branch is also created for a major release when master moves
  on to active development of the next major release.  For example,
  `v1-maintenance` was created when 1.5.0 was released (last planned 1.x
  release) and development of 2.0.0 (with API incompatible changes) started
  on master.  The 1.6.0 and 1.7.0 releases were made from `v1-maintenance`
  for example.

Versioning
----------

Duktape uses [Semantic Versioning](http://semver.org/).
Because Duktape tracks the latest Ecmascript specification versions,
compliance fixes are made in minor versions even when they are technically
not backwards compatible.  See
[Versioning](http://duktape.org/guide.html#versioning) for details.

Reporting bugs
--------------

See [CONTRIBUTING.md](https://github.com/svaarala/duktape/blob/master/CONTRIBUTING.md).

Security critical Github issues (for example anything leading to a segfault)
are tagged `security`.

Contributing
------------

See [CONTRIBUTING.md](https://github.com/svaarala/duktape/blob/master/CONTRIBUTING.md).

Copyright and license
---------------------

See [AUTHORS.rst](https://github.com/svaarala/duktape/blob/master/AUTHORS.rst)
and [LICENSE.txt](https://github.com/svaarala/duktape/blob/master/LICENSE.txt).

[Duktape Wiki](https://github.com/svaarala/duktape-wiki/) is part of Duktape
documentation and under the same copyright and license.