Streem

Streem is a stream-based concurrent scripting language. It is based on a programming model similar to the shell, with influences from Ruby, Erlang, and other functional programming languages.

Note: Streem is still in the design stage. It’s not working yet. Stay tuned.

Streem documentation

The Streem documentation is available online. It covers usage, language features, standard and math libraries.

Compiling

Installing dependencies

• bison
• flex
• gcc / clang

Run make

make

Examples

In Streem, a simple cat program looks like this:

stdin | stdout

You can try it out by (firstly cd to streem top directory):

$ bin/streem -e 'stdin | stdout'

or

$ bin/streem examples/01cat.strm

Streem is a (sort of) DSL for data flows. Above code means building data-flow connection between stdin and stdout. Actual data processing will be done in the event loop invoked after program execution.

For another example, a simple FizzBuzz will look like this:

# seq(100) returns a stream of numbers from 1 to 100.
# A function object in pipeline works as a map function.
# stdout is an output destination.
seq(100) | map{x->
  if (x % 15 == 0)     "FizzBuzz"
  else if (x % 3 == 0) "Fizz"
  else if (x % 5 == 0) "Buzz"
  else                 x
} | stdout

The second part in the pipeline ({x ->...}) is a function object. If a function object is connected in the pipeline, it will be invoked for each element in the stream.

There are more examples under folder examples/. Just play with them!

Contributing

Send a pull request to https://github.com/matz/streem. We consider you have granted non-exclusive right to your contributed code under MIT license. Use https://github.com/matz/streem/issues for discussion.

License

MIT license (© 2015-2016 Yukihiro Matsumoto)