Lua string functions not fully supported

[nichtich]

Apparently Lua string functions is not fully supported in the compiled Lua interpreter. I successfully tried

• string.byte("ABCDE", 2)
• string.char(65,66,67,68,69)
• string.format("%.7f", math.pi)
• string.gsub("Hello banana", "banana", "Lua user")
• string.gsub("banana", "(an)", "%1-")
• string.rep("Lua ",5)
• string.reverse("lua")
• string.sub("Hello Lua user", -8, 9)
• string.upper("Hello, Lua user!")

but the following functions produces an (error object is not a string) which is not very helpful anyway:

• string.find("Hello Lua user", "Lua")
• string.gsub("Hello Lua user", "(%w+)", print)
• for word in string.gmatch("Hello Lua user", "%a+") do print(word) end
• string.match("I have 2 questions for you.", "%d+ %a+")

Since searching in strings is a very common task, the Lua interpreter is of little use with this limitations. I think the bug is in the compilation of lstrlib.c but I could not track down the error.

[kripken]

It should not be hard to debug this (using the autodebugger, see Debugging wiki page), once we have Lua built from source in the test runner (that will let us see what source code corresponds to the .ll and .js, etc.). I filed issue #5 for doing that.

[max99x]

All of these work perfectly on the current trunk. Perhaps the demo page should be updated?

[kripken]

Perhaps the demo page should be updated?

I guess I can just link to repl.it now ;) Would you be ok with that?

[max99x]

I certainly would! :)

[kripken]

Done.