update for latest lua version

[gitshub]

Would you consider updating and testing this very interesting software to run on the
latest version of Lua? I am using Lua 5.3 on Linux, and I tried to replace the 3 usages of 'loadstring' in 'Parser.lua' with

if _VERSION == "Lua 5.1" then
setfenv(loadstring(code), env)()
else
load(code,code,'bt',env)()
end

but perhaps this is not sufficient--there still seem to be problems.

Thanks

[weshoke]

Can you give me a test case? I'm happy to merge this when any know issues are fixed.

[gitshub]

I am a beginner at Lua and Lpeg and I am trying to learn them, as well as learn about making a DSL. So I apologize if I am missing something obvious. I believe you have 3 test cases:

/DSL-master/test/test.expr.lua
                test.json.lua
and
                test.lust.json.lua

I am using Linux Mint, Lua 5.3.2, and Lpeg 1.0.0-1 to run these tests (although the third requires LuaAV, which I am skipping for now).
I believe your module was tested with earlier software, perhaps Lua 5.1 and an Lpeg before 0.12, right?.

Your module mentions "loadstring" and "setfenv", which I think have been removed from Lua 5.3. Also, a check for "empty loop in rule" was apparently added to Lpeg at about version 0.12 (see http://lua-users.org/lists/lua-l/2013-06/msg00086.html ) because when I run "test.expr.lua" I get "Parser.lua:183: empty loop in rule 'statement_list' ". Because of changes mentioned in my original post, line 183 holds the statement

self.patt = ignore * peg.P(grammar) * ignore * peg.P(-1)

in

function M:create_grammar(ignore)

I was hoping you might be able to get these three tests working with the latest Lua and Lpeg software.

Thanks again

[gitshub]

By the way, for what its worth, the

Lua Version Manager - luavm     https://dhavalkapil.com/luaver/

is a Command line tool to manage and switch between different versions of lua, LuaJIT and luarocks.

For example, I did

 luavm install 5.3.2

to install Lua 5.3.2

[weshoke]

Thanks. I'll take a look and fix. It has been a while since I used Lua.