Gleam is a simple Scheme language interpreter written in Java.

Related tags

Miscellaneous scheme interpreter scheme-interpreter continuations r5rs scheme-language scheme-programming-language
Overview

Gleam Scheme Interpreter

(c) 2001-2020 Guglielmo Nigri (guglielmonigri at yahoo.it, googlielmo at gmail.com)

Gleam comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it under certain conditions; see LICENSE.TXT.

Abstract

Gleam is a simple Scheme language interpreter written in Java.

Project goals: to support the discovery of Scheme for beginners, simplicity, R5RS compliance, full integration with the Java platform (call Java from Scheme and vice versa).

Contents

Other docs in this repository

How to build and run Gleam

See BUILD.TXT.

Project history

I started this project in 2001 while looking for a Lisp interpreter to add scripting capabilities to Java programs.

I already knew Lisp (and liked it a lot) from my university days in Pisa, Italy, and I thought I could augment Java with Lisp. It was around that time that I discovered Scheme and I was instantly fascinated by the simplicity and elegance of the language. I found out that there were already some good Java implementations of Scheme out there, but, you know, I have to try my hand at something to grok it! :-)

So I started my simple, slow implementation of an interpreter, always looking at the R5RS document for reference. One of the first things that I was curious to implement was first-class continuations. I wondered if there was a simple way to do those in Java. In fact, this being an interpreter, it was relatively easy to emulate them. For a compiler, it would be trickier. We'll see in version 2 ;-)

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Releases(v1.2.0)

  • v1.2.0(Feb 15, 2022)

    Release 1.2.0

    2022-02-15

    Refactor the main REPL

Refactor the Logger
 - add getLogger() factory method
 - Log caller class and method name
 - Add custom LogFormatter
 - Remove per-thread logger
 - Set default logger level to INFO

Bug fixes and better tests
 - Upgrade test framework to Junit 5
 - Fix: ExpressionInEnvironmentAction NPE
 - Fix: trace per Interpreter
 - Parameterized tests
 - Reader tests

    2020-12-27

    Refactor the Interpreter
 - Remove static environments
 - Each Interpreter instance is independently bootstrapped
 - Remove ThreadLocal Interpreter
 - Move I/O ports to Environment
 - Change access to singletons, from value() to VALUE constant
 - Change StringBuffer to StringBuilder in MutableString
 - Implement hash() and equals() in MutableString

Add continuation tests

Improve doc strings and help output
 - Edit/fix README.md
 - New repo links in CONTRIBUTING.md

    2020-11-09

    Trace actions in the REPL: enable with !tron, disable with !troff.
Per-thread logger.

    2020-11-07

    Add native (scheme) tests.
Per-interpreter I/O.
Bootstrap in Report Environment.
Extend analyze() to redefined syntax.
Fix: check number of arguments in PrimitiveProcedure.

    2020-10-22

    Migrate to Java 8: Use switch for strings.

    Full Changelog: https://github.com/googlielmo/gleam/compare/legacy-sourceforge...v1.2.0

    Source code(tar.gz)
    Source code(zip)
    gleam-1.2.0.jar(156.92 KB)

  • v1.1.0(Jan 25, 2022)

  • v1.0.1(Jan 25, 2022)

  • v1.0.0(Jan 25, 2022)

  • legacy-sourceforge(Jan 25, 2022)

    Legacy code from https://sourceforge.net/projects/gleam/

    It was converted from svn to git following the instructions at https://www.git-scm.com/book/it/v2/Git-and-Other-Systems-Migrating-to-Git

    Source code(tar.gz)
    Source code(zip)
Owner
Guglielmo Nigri
Guglielmo Nigri
GitHub
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