It's a single-pass transpiler that directly generates Lua code from the Esprima AST, without any kind of IR. Quick-and-dirty, cutting corners, etc etc - don't expect much of this code :) For example, each ternary expression (?:) generates 4 function calls and a closure - too lazy to implement anything more clever :)
Runs on vanilla LuaJIT, without any C modules or hacking the VM (e.g. Tessel runs on Lua, too, but on heavily modified runtime, which I didnt like)
Oh, and it probably can't bootstrap itself right now. Anyone willing to make it self-hosting? That would be cool :)
Results on ES5 test suite in 10 days:
Passed: 3659 Failed: 7753 Cannot Translate: 138 Skipped: 175 Total: 11725 Time: 1479.842
Requirements and usage
Uses LuaJIT, esprima, lua-date, lpeglj, ta-regex, ast-hoist, esutils, escodegen
Tested under LuaJIT 2.1+ and node 0.10+.
Assumes LuaJIT binary at
To run something:
node run.js something.js. After translation, you can also use
luajit something.lua to run translated code directly.
To run tests:
node test\test.js test\sometestname.js. It compares STDOUT of JS and Lua versions to decide if the test passed.
To run entire ES5 test suite:
node test\test.js test\es5\**\*.js (WARNING: Full suite takes over 20 minutes on fast, SSD-equipped machine!)
Some tests are blacklisted (grep for LUA_SKIP) because they cause infinite loop or do something similarly bad, they're marked as "skipped".
(c) 2015 Oleksandr Nikitin email@example.com