Porting programming languages to CPython VM.
There is only an experimental partial implementation of Lua 5.2 right now. You can try it out with following commands.
$ pip install git+git://github.com/xiazheteng/orz
$ cat > hello.lua << EOF
print(_VERSION)
EOF
$ python -m orz.lua hello.lua
Lua 5.2
$Most Lua language features are missing.
| GC Metamethod | No |
| Weak Table | No |
| Coroutine | No |
| goto statement | Partial |
| proper tail recursion | No |
Only a small subset of Lua Standard Libraries are implemented.
| Basic Library | Partial |
| Coroutine | No |
| Package Library | Partial |
| String Library | Partial |
| Table | Yes |
| Math | Bug, see Number |
| Bit32 | No |
| I/O Library | Partial |
| OS Library | Partial |
| Debug | No |
| assert | Yes |
| collectgarbage | No |
| dofile | No |
| error | Partial |
| _G | Partial |
| getmetatable | Yes |
| ipairs | Yes |
| load | Different1 |
| loadfile | Different2 |
| next | No |
| pairs | No |
| pcall | No |
| Bug | |
| rawequal | Yes |
| rawget | Yes |
| rawlen | Yes |
| rawset | Yes |
| select | Yes |
| setmetatable | Yes |
| tonumber | Bug, see tonumber |
| tostring | Yes |
| type | No |
| _VERSION | Yes |
| xpcall | No |
| require | Partial |
| package.config | No |
| package.cpath | No |
| package.loaded | No |
| package.loadlib | No |
| package.path | No |
| package.preload | No |
| package.searchers | No |
| package.searchpath | No |
| string.byte | Yes |
| string.char | Yes |
| string.dump | No |
| string.find | No |
| string.format | Bug, see Format |
| string.gmatch | Different3 |
| string.gsub | Different4 |
| string.len | Yes |
| string.lower | Yes |
| string.match | Different5 |
| string.rep | Yes |
| string.reverse | Yes |
| string.sub | Yes |
| string.upper | Yes |
| io.close | Partial |
| io.flush | Yes |
| io.input | Yes |
| io.lines | No |
| io.open | Yes |
| io.output | Yes |
| io.popen | No |
| io.read | Partial |
| io.tmpfile | Yes |
| io.type | Yes |
| io.write | Yes |
| file:close | Partial |
| file:flush | Yes |
| file:lines | No |
| file:read | Partial |
| file:seek | Yes |
| file:setvbuf | No |
| file:write | Yes |
| os.clock | Yes |
| os.date | Yes |
| os.difftime | Yes |
| os.execute | Yes |
| os.exit | Partial |
| os.getenv | Yes |
| os.remove | Yes |
| os.rename | Yes |
| os.setlocale | No |
| os.time | Yes |
| os.tmpname | No |
All ValueError are converted to nan, and all OverflowError are converted to inf.
The convertion of fraction part of hexadecimal constants may overflow.
string.format is simply equivalent to formatstring%... in Python, now.
The following program, Lua 5.2.1 displays 1, but orz.lua displays nil.
a = 0
function x()
_ENV = {print=print}
return 1
end
_ENV["a"] = x()
print(a)Footnotes
load does not accept Lua chunks in binary mode but marshaled Python code objects instead. And the second argument of load is changed to filename↩
load does not accept Lua chunks in binary mode but marshaled Python code objects instead. And the second argument of load is changed to filename↩
Currently, patterns are just Python regular expressions.↩
Currently, patterns are just Python regular expressions.↩
Currently, patterns are just Python regular expressions.↩