package js_of_ocaml

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Compiler from OCaml bytecode to Javascript

Install

Dune Dependency

Authors

Maintainers

Sources

js_of_ocaml-3.5.0.tbz
sha256=c19903c11a7e7657a4bb92de9ad910e6daf5afc9da7222dcd8fe8da8867f05b7
sha512=3aa852552abe268504f7e26841bd1c43e95dba0a5827f70b97230e900909c3fa94f59715b45ce658f0c2e298a0e89c882a994d5fcc6bcf75250cf0b94733fa88

Description

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

Published: 11 Nov 2019

README

README.md

Js_of_ocaml (jsoo)

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.

Requirements

See opam file for version constraints.

optional

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-ppx

Manual

  • edit Makefile.conf to change the default configuration

  • run make all to compile

  • run make install as root to install the compiler and its libraries

  • run make uninstall as root to uninstall them

You can run make toplevel-examples if you want to build a Web-based OCaml toplevel as well. Try the toplevel

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.syntax 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,

  • Weak semantic cannot be implemented using JavaScript. A dummy implementation is provided.

  • Most of the Sys module is not supported.

Extra libraries distributed with OCaml (such as Thread or Str) are not supported in general. However,

  • Bigarray: bigarrays are supported using Typed Arrays

  • Num: supported using +nat.js option

  • Graphics: partially supported using canvas (see js_of_ocaml.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 about tail call optimization.

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 of floats is not supported (unmarshalling works);

  • the polymorphic hash function will not give the same results on datastructures containing floats;

  • these functions may be more prone to stack overflow.

Toplevel

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
ocamlbuild/ ocamlbuild plugin for js_of_ocaml

Dependencies (6)

  1. js_of_ocaml-compiler = version
  2. uchar
  3. ppx_tools_versioned >= "5.2.3"
  4. ocaml-migrate-parsetree >= "1.4" & < "2.0.0"
  5. dune >= "1.11.1"
  6. ocaml >= "4.02.0"

Dev Dependencies

None

Used by (68)

  1. alba >= "0.4.1" & < "0.4.3"
  2. async_js >= "v0.13.0" & < "v0.15.0"
  3. brr-lwd
  4. chartjs
  5. chartjs-annotation
  6. chartjs-colorschemes
  7. chartjs-datalabels
  8. chartjs-streaming
  9. cohttp-lwt-jsoo >= "2.5.0"
  10. coinst
  11. cordova
  12. cordova-plugin-background-mode
  13. cordova-plugin-battery-status
  14. cordova-plugin-local-notifications
  15. cordova-plugin-sim-card
  16. dream >= "1.0.0~alpha5"
  17. eliom = "6.3.0" | >= "6.5.0" & < "6.8.0" | >= "6.9.2" & < "6.10.1"
  18. eris
  19. gen_js_api < "1.0.7"
  20. github-jsoo < "4.0.0"
  21. hardcaml = "1.2.0"
  22. hardcaml-examples >= "0.3.0"
  23. hardcaml-framework
  24. incr_dom < "v0.15.0"
  25. incr_dom_interactive < "v0.15.0"
  26. incr_dom_keyboard
  27. incr_dom_partial_render < "v0.15.0"
  28. incr_dom_sexp_form < "v0.15.0"
  29. incr_dom_widgets
  30. iocamljs-kernel = "0.4.5"
  31. irmin-indexeddb >= "2.0"
  32. joolog
  33. js_of_ocaml-lwt = "3.5.0"
  34. js_of_ocaml-ppx = "3.5.0"
  35. js_of_ocaml-ppx_deriving_json = "3.5.0"
  36. js_of_ocaml-toplevel = "3.5.0"
  37. js_of_ocaml-tyxml = "3.5.0"
  38. js_of_ocaml-webgpu
  39. js_of_ocaml-webidl
  40. json-data-encoding-browser
  41. jsonoo
  42. jsoo_broadcastchannel >= "2.0.0"
  43. jsoo_storage >= "1.0.1"
  44. kkmarkdown
  45. leaflet
  46. learn-ocaml >= "0.12"
  47. liquidsoap-js
  48. lp-glpk-js
  49. nanoid
  50. node_of_ocaml
  51. nuscr < "1.1.0"
  52. ocaml-gist
  53. ocplib-json-typed-browser
  54. ocsigen-start >= "1.7.0" & != "2.15.1" & < "2.16.0"
  55. ocsigen-toolkit >= "2.13.0" & < "3.1.1"
  56. plotly
  57. polynomial >= "0.4.0"
  58. ppx_jsobject_conv >= "0.6.0" & < "0.9.0"
  59. promise_jsoo
  60. rpclib-js
  61. spin >= "0.8.0"
  62. tezt >= "3.1.0"
  63. timmy-jsoo
  64. tyxml-lwd
  65. vg = "0.9.3"
  66. virtual_dom < "v0.15.0"
  67. webtest-js
  68. wikitext

Conflicts

None

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