mirror of
https://github.com/janet-lang/janet
synced 2024-12-24 23:40:27 +00:00
1e70c97ef0
Use compiler define -DJANET_NO_PEG to turn off the peg module.
192 lines
7.7 KiB
Markdown
192 lines
7.7 KiB
Markdown
[![Join the chat](https://badges.gitter.im/janet-language/community.svg)](https://gitter.im/janet-language/community)
|
|
|
|
[![Appveyor Status](https://ci.appveyor.com/api/projects/status/bjraxrxexmt3sxyv/branch/master?svg=true)](https://ci.appveyor.com/project/bakpakin/janet/branch/master)
|
|
[![Build Status](https://travis-ci.org/janet-lang/janet.svg?branch=master)](https://travis-ci.org/janet-lang/janet)
|
|
[![builds.sr.ht status](https://builds.sr.ht/~bakpakin/janet/.freebsd.yaml.svg)](https://builds.sr.ht/~bakpakin/janet/.freebsd.yaml?)
|
|
|
|
<img src="https://raw.githubusercontent.com/janet-lang/janet/master/assets/janet-w200.png" alt="Janet logo" width=200 align="left">
|
|
|
|
**Janet** is a functional and imperative programming language and bytecode interpreter. It is a
|
|
modern lisp, but lists are replaced
|
|
by other data structures with better utility and performance (arrays, tables, structs, tuples).
|
|
The language also supports bridging to native code written in C, meta-programming with macros, and bytecode assembly.
|
|
|
|
There is a repl for trying out the language, as well as the ability
|
|
to run script files. This client program is separate from the core runtime, so
|
|
janet could be embedded into other programs. Try janet in your browser at
|
|
[https://janet-lang.org](https://janet-lang.org).
|
|
|
|
#
|
|
|
|
Implemented in mostly standard C99, janet runs on Windows, Linux and macOS.
|
|
The few features that are not standard C (dynamic library loading, compiler specific optimizations),
|
|
are fairly straight forward. Janet can be easily ported to new platforms.
|
|
|
|
For syntax highlighting, there is some preliminary vim syntax highlighting in [janet.vim](https://github.com/janet-lang/janet.vim).
|
|
Generic lisp syntax highlighting should, however, provide good results. One can also generate a janet.tmLanguage
|
|
file for other programs with `make grammar`.
|
|
|
|
## Use Cases
|
|
|
|
Janet makes a good system scripting language, or a language to embed in other programs. Think Lua or Guile.
|
|
|
|
## Features
|
|
|
|
* Minimal setup - one binary and you are good to go!
|
|
* First class closures
|
|
* Garbage collection
|
|
* First class green threads (continuations)
|
|
* Python style generators (implemented as a plain macro)
|
|
* Mutable and immutable arrays (array/tuple)
|
|
* Mutable and immutable hashtables (table/struct)
|
|
* Mutable and immutable strings (buffer/string)
|
|
* Lisp Macros
|
|
* Byte code interpreter with an assembly interface, as well as bytecode verification
|
|
* Tailcall Optimization
|
|
* Direct interop with C via abstract types and C functions
|
|
* Dynamically load C libraries
|
|
* Functional and imperative standard library
|
|
* Lexical scoping
|
|
* Imperative programming as well as functional
|
|
* REPL
|
|
* Parsing Expression Grammars built in to the core library
|
|
* 300+ functions and macros in the core library
|
|
* Embedding Janet in other programs
|
|
* Interactive environment with detailed stack traces
|
|
|
|
## Documentation
|
|
|
|
Documentation can be found in the doc directory of
|
|
the repository. There is an introduction
|
|
section contains a good overview of the language.
|
|
|
|
API documentation for all bindings can also be generated
|
|
with `make docs`, which will create `build/doc.html`, which
|
|
can be viewed with any web browser. This
|
|
includes all forms in the core library except special forms.
|
|
|
|
For individual bindings from within the REPL, use the `(doc symbol-name)` macro to get API
|
|
documentation for the core library. For example,
|
|
```
|
|
(doc doc)
|
|
```
|
|
Shows documentation for the doc macro.
|
|
|
|
To get a list of all bindings in the default
|
|
environment, use the `(all-symbols)` function.
|
|
|
|
## Installation
|
|
|
|
Install a stable version of janet from the [releases page](https://github.com/janet-lang/janet/releases).
|
|
Janet is prebuilt for a few systems, but if you want to develop janet, run janet on a non-x86 system, or
|
|
get the latest, you must build janet from source. Janet is in alpha and may change
|
|
in backwards incompatible ways.
|
|
|
|
## Usage
|
|
|
|
A repl is launched when the binary is invoked with no arguments. Pass the -h flag
|
|
to display the usage information. Individual scripts can be run with `./janet myscript.janet`
|
|
|
|
If you are looking to explore, you can print a list of all available macros, functions, and constants
|
|
by entering the command `(all-bindings)` into the repl.
|
|
|
|
```
|
|
$ ./janet
|
|
Janet 0.0.0 alpha Copyright (C) 2017-2018 Calvin Rose
|
|
janet:1:> (+ 1 2 3)
|
|
6
|
|
janet:2:> (print "Hello, World!")
|
|
Hello, World!
|
|
nil
|
|
janet:3:> (os.exit)
|
|
$ ./janet -h
|
|
usage: ./janet [options] scripts...
|
|
Options are:
|
|
-h Show this help
|
|
-v Print the version string
|
|
-s Use raw stdin instead of getline like functionality
|
|
-e Execute a string of janet
|
|
-r Enter the repl after running all scripts
|
|
-p Keep on executing if there is a top level error (persistent)
|
|
-- Stop handling option
|
|
$
|
|
```
|
|
|
|
## Embedding
|
|
|
|
The C API for Janet is not yet documented but coming soon.
|
|
|
|
Janet can be embedded in a host program very easily. There is a make target `make amalg`
|
|
which creates the file `build/janet.c`, which is a single C file that contains all the source
|
|
to Janet. This file, along with `src/include/janet/janet.h` can dragged into any C project
|
|
and compiled into the project. Janet should be compiled with `-std=c99` on most compilers, and
|
|
will need to be linked to the math library, `-lm`, and the dynamic linker, `-ldl`, if one wants
|
|
to be able to load dynamic modules. If there is no need for dynamic modules, add the define
|
|
`-DJANET_NO_DYNAMIC_MODULES` to the compiler options.
|
|
|
|
## Compiling and Running
|
|
|
|
Janet only uses Make and batch files to compile on Posix and windows
|
|
respectively. To configure janet, edit the header file src/include/janet/janet.h
|
|
before compilation.
|
|
|
|
### macos and Unix-like
|
|
|
|
On most platforms, use Make to build janet. The resulting binary will be in `build/janet`.
|
|
|
|
```sh
|
|
cd somewhere/my/projects/janet
|
|
make
|
|
make test
|
|
```
|
|
|
|
After building, run `make install` to install the janet binary and libs.
|
|
Will install in `/usr/local` by default, see the Makefile to customize.
|
|
|
|
It's also recommended to set the `JANET_PATH` variable in your profile.
|
|
This is where janet will look for imported libraries after the current directory.
|
|
|
|
### FreeBSD
|
|
|
|
FreeBSD build instructions are the same as the unix-like build instuctions,
|
|
but you need `gmake` and `gcc` to compile.
|
|
|
|
```
|
|
cd somewhere/my/projects/janet
|
|
gmake CC=gcc
|
|
gmake test CC=gcc
|
|
```
|
|
|
|
### Windows
|
|
|
|
1. Install [Visual Studio](https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=Community&rel=15#)
|
|
or [Visual Studio Build Tools](https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=BuildTools&rel=15#)
|
|
2. Run a Visual Studio Command Prompt (cl.exe and link.exe need to be on the PATH) and cd to the directory with janet.
|
|
3. Run `build_win` to compile janet.
|
|
4. Run `build_win test` to make sure everything is working.
|
|
|
|
### Emscripten
|
|
|
|
To build janet for the web via [Emscripten](https://kripken.github.io/emscripten-site/), make sure you
|
|
have `emcc` installed and on your path. On a linux or macOS system, use `make emscripten` to build
|
|
`janet.js` and `janet.wasm` - both are needed to run janet in a browser or in node.
|
|
The JavaScript build is what runs the repl on the main website,
|
|
but really serves mainly as a proof of concept. Janet will run slower in a browser.
|
|
Building with emscripten on windows is currently unsupported.
|
|
|
|
## Examples
|
|
|
|
See the examples directory for some example janet code.
|
|
|
|
## Discussion
|
|
|
|
Feel free to ask questions and join discussion on the [Janet Gitter Channel](https://gitter.im/janet-language/community).
|
|
Alternatively, check out [the #janet channel on Freenode](https://webchat.freenode.net/)
|
|
|
|
## Why Janet
|
|
|
|
Janet is named after the almost omniscient and friendly artificial being in [The Good Place](https://en.wikipedia.org/wiki/The_Good_Place).
|
|
|
|
<img src="https://raw.githubusercontent.com/janet-lang/janet/master/assets/janet-the-good-place.gif" alt="Janet logo" width="115px" align="left">
|
|
|