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A modern, multi-paradigm programming language.

Project description


Asteroid is a modern, multi-paradigm programming language that supports first-class patterns. More details can be found at the website Documentation on Asteroid can be found at

New in Release 2.0.1

  • We now support the ASTEROIDPATH environment variable which is expected to have a colon seperated list of directories to search for user defined modules.

  • The logical operators 'and' and 'or' are now evaluated in short-circuit fashion.

  • Files loaded with the 'load' statement are now considered modules and work similarly to Python modules.

  • Added the 'toplevel' function which returns true if control is in the module originally loaded by the interpreter.

  • Added the match statement similar to the match statement in Python.

  • No longer supports type hierarchies for the primitive types. The functions in the 'type' module are now considered builtins. The 'type' module itself has been eliminated.

  • The Minimal Asteroid Debugger (MAD) replaces ADB in this release.

  • The shorthand conditional pattern can now be applied to arbitrary patterns. E.g. The pattern


    constrains the triple (a,b,c) to be a triple of integers. The above shorthand conditional pattern is equivalent to the conditional pattern,

    (a,b,c) if (a,b,c) is (%integer,%integer,%integer)

New in Release 1.1.4

  • Allows pattern constraint operator to map certain variables that a pattern matched to be bound into the current scope.

  • Supports a new OS module.

  • Supports iteration over tuple components

  • The eval function has been extended to strings for the interpretation of Asteroid programs in those strings.

  • Structures now support a __str__ member function that allows the user to specify a string representation of the structure.

  • Updated user and reference guides.

  • Lots of bug fixes.

New in Release 1.1.3

  • Fixes a fatal bug on Windows regarding the readline functionality in Python 3.10.

  • Fixes a bug with escaped double quotes in strings.

New in Release 1.1.2

  • An experimental implementation of an interactive debugger that supports debugging pattern matching and in particular, pattern matching with first-class patterns.

  • A Python API allowing the developer to call the Asteroid interpreter from within a Python program and also embed Python code in an Asteroid program.

  • Eliminated the stride notation in list comprehensions and replaced it with the step notation.

  • Lots of bug fixes.

New in Release 1.0.0

  • Interpreter line-editing features similar to Python include interactive editing, history substitution and code completion on systems that support the GNU Readline library.

  • New object-based modules for system modules. For example the functions within the io module are now accessed with the @ operator,

    load system io.
    io @println "Hello, World!".
  • In the absence of explicit return statements the last expression evaluated within a function body provides an implicit return value, e.g.,

    function inc
       with i do
  • Lots of bug fixes!

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