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https://github.com/ocsigen/js_of_ocaml

Compiler from OCaml to Javascript.
https://github.com/ocsigen/js_of_ocaml

compiler javascript jsoo ocaml ocsigen

Last synced: about 2 months ago
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Compiler from OCaml to Javascript.

Host: GitHub
URL: https://github.com/ocsigen/js_of_ocaml
Owner: ocsigen
License: other
Created: 2013-07-29T20:28:11.000Z (about 11 years ago)
Default Branch: master
Last Pushed: 2024-04-13T20:17:28.000Z (5 months ago)
Last Synced: 2024-04-13T21:03:57.843Z (5 months ago)
Topics: compiler, javascript, jsoo, ocaml, ocsigen
Language: OCaml
Homepage: http://ocsigen.org/js_of_ocaml/
Size: 523 MB
Stars: 932
Watchers: 39
Forks: 181
Open Issues: 43
Metadata Files:
- Readme: README.md
- Changelog: CHANGES.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md

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awesome-list - js_of_ocaml

README

        # Js_of_ocaml (jsoo)

[![Build Status](https://github.com/ocsigen/js_of_ocaml/workflows/build/badge.svg?branch=master)](https://github.com/ocsigen/js_of_ocaml/actions)

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[![Update Web site - deploy](https://github.com/ocsigen/js_of_ocaml/actions/workflows/pages/pages-build-deployment/badge.svg)](https://github.com/ocsigen/js_of_ocaml/actions/workflows/pages/pages-build-deployment)

Js_of_ocaml is a compiler from OCaml bytecode to JavaScript. It makes it

possible to run pure OCaml programs in JavaScript environment like browsers and

Node.js.

- It is easy to install and use as it works with an existing installation of

  OCaml, with no need to recompile any library.

- It comes with bindings for a large part of the browser APIs.

- According to our benchmarks, the generated programs runs typically faster than

  with the OCaml bytecode interpreter.

- We believe this compiler will prove much easier to maintain than a retargeted

  OCaml compiler, as the bytecode provides a very stable API.

Js_of_ocaml is composed of multiple packages:

- js_of_ocaml-compiler, the compiler.

- js_of_ocaml-ppx, a ppx syntax extension.

- js_of_ocaml, the base library.

- js_of_ocaml-ppx_deriving_json

- js_of_ocaml-lwt, lwt support.

- js_of_ocaml-tyxml, tyxml support.

- js_of_ocaml-toplevel, lib and tools to build an ocaml toplevel to

  javascript.

## Requirements

See

[opam](https://github.com/ocsigen/js_of_ocaml/blob/master/js_of_ocaml-compiler.opam)

file for version constraints.

### optional

- [lwt](https://github.com/ocsigen/lwt)

- [tyxml](https://github.com/ocsigen/tyxml)

- [reactiveData](https://github.com/ocsigen/reactiveData)

- [yojson](https://github.com/ocaml-community/yojson)

### Toplevel requirements

- tyxml, reactiveData

- ocp-indent: needed to support indentation in the toplevel

- higlo: needed to support Syntax highlighting in the toplevel

- cohttp: needed to build the toplevel webserver

## Installation

### Opam

```

opam install js_of_ocaml js_of_ocaml-compiler js_of_ocaml-ppx

```

## Usage

Your program must first be compiled using the OCaml bytecode compiler `ocamlc`.

JavaScript bindings are provided by the `js_of_ocaml` package. The syntax

extension is provided by `js_of_ocaml-ppx` package.

```

ocamlfind ocamlc -package js_of_ocaml -package js_of_ocaml-ppx -linkpkg -o cubes.byte cubes.ml

```

Then, run the `js_of_ocaml` compiler to produce JavaScript code:

```

js_of_ocaml cubes.byte

```

## Features

Most of the OCaml standard library is supported. However,

- Most of the Sys module is not supported.

Extra libraries distributed with OCaml (such as Thread) are not supported in

general. However,

- Bigarray: bigarrays are supported using Typed Arrays

- Num: supported

- Str: supported

- Graphics: partially supported using canvas (see js_of_ocaml-lwt.graphics)

- Unix: time related functions are supported

Tail call is not optimized in general. However, mutually recursive functions are

optimized:

- self recursive functions (when the tail calls are the function itself) are

  compiled using a loop.

- trampolines are used otherwise.

  [More](http://ocsigen.org/js_of_ocaml/dev/manual/tailcall) about tail call

  optimization.

Effect handlers are supported with the `--enable=effects` flag.

## Data representation

Data representation differs from the usual one. Most notably, integers are 32

bits (rather than 31 bits or 63 bits), which is their natural size in

JavaScript, and floats are not boxed. As a consequence, marshalling, polymorphic

comparison, and hashing functions can yield results different from usual:

- marshalling floats might generate different output. Such output should not be

  unmarshalled using the standard ocaml runtime (native or bytecode).

- the polymorphic hash function will not give the same results on datastructures

  containing floats;

- these functions may be more prone to stack overflow.

| OCaml | javascript |

| ------------- | ------------- |

| int   | number (32bit int)  |

| int32 | number (32bit int)  |

| nativeint | number (32bit int)  |

| int64 | Object (MlInt64) |

| float | number |

| string | string or object (MlBytes) |

| bytes | object (MlBytes) |

| "immediate" (e.g. true, false, None, ()) | number (32bit int) |

| "block" | array with tag as first element (e.g. `C(1,2) => [tag,1,2]`) |

| array | block with tag 0 (e.g. `[\|1;2\|] => [0,1,2]`) |

| tuple | block with tag 0 (e.g. `(1,2) => [0,1,2]`) |

| record | block (e.g. `{x=1;y=2} => [0,1,2]`) |

| constructor with arguments | block (e.g. `C (1, 2) => [tag,1,2]`) |

| module | block |

| exception and extensible variant | block or immediate |

| function | function |

## Toplevel

- [OCaml 4.04.2](http://ocsigen.github.io/js_of_ocaml/toplevel/#version=4.04.2)

  includes Base, Core_kernel, Async_kernel, Async_js

- [OCaml 4.04.0+BER](http://ocsigen.github.io/js_of_ocaml/toplevel/#version=4.04.0+BER)

  see http://okmij.org/ftp/ML/MetaOCaml.html

- [OCaml 4.05.0](http://ocsigen.github.io/js_of_ocaml/toplevel/#version=4.05.0)

  includes Base, Core_kernel, Async_kernel, Async_js

- [OCaml 4.06.0](http://ocsigen.github.io/js_of_ocaml/toplevel/#version=4.06.0)

  includes Base, Core_kernel, Async_kernel, Async_js

## Contents of the distribution

| Filename    | Description                                  |

| ----------- | -------------------------------------------- |

| LICENSE     | license and copyright notice                 |

| README      | this file                                    |

| compiler/   | compiler                                     |

| examples/   | small examples                               |

| lib/        | library for interfacing with JavaScript APIs |

| ppx/        | ppx syntax extensions                        |

| runtime/    | runtime system                               |

| toplevel/   | web-based OCaml toplevel                     |