[moonsharp] Unescaped control string error when using decode() and - is in a string

[TheCheddarCheese]

for example:
lunajson.decode('{"file0001.png":[0, 0]}') works
but lunajson.decode('{"file-0001.png":[0, 0]}') throws an error

if this is a thing with json then please forgive me for being stupid

[tst2005]

I'm not reproducing your problem...

• Do you get the same issue with any value ?
• lunajson.decode('{"foo-bar":"buz"}') fail ?

[TheCheddarCheese]

yeah
forgot to mention the program uses moonsharp, so maybe it's just that

[tst2005]

Oh yes, there is probably a difference of behavior or implementation somewhere...

The error message comes from lunajson :
see https://github.com/grafi-tt/lunajson/blob/master/src/lunajson/decoder.lua#L341
but the error is raised for a reason.
We need more information...

Can you change the line 341 of lunajson.decode to replace

decode_error("unescaped control string")

by

decode_error("unescaped control string" .. " ; str=" .. tostring(str) .. " ; f_str_ctrl_pat=" .. tostring(f_str_ctrl_pat) .. " ;" )

The error will show the value of str and f_str_ctrl_pat ... useful to understand/reproduce the issue.

[grafi-tt]

Thank you for reporting the issue. Many thanks to @tst2005 too.

Could you report lua version? Perhaps - in a pattern is misinterpreted by some lua implementation.

See

lunajson/src/lunajson/decoder.lua

Lines 15 to 20 in 3d10600

	if _VERSION == "Lua 5.1" then
	-- use the cluttered pattern because lua 5.1 does not handle \0 in a pattern correctly
	f_str_ctrl_pat = '[^\32-\255]'
	else
	f_str_ctrl_pat = '[\0-\31]'
	end

[grafi-tt]

OK maybe this issue is relevant. moonsharp-devs/moonsharp#29

Could you modify the version check and test again? If it works fine, I'll merge a PR.