Thanks V.
As incomplete is checking for LUA_ERRSYNTAX I guess in Lua I can do similar thing by checking “near <eof>” error.
LUA_PROMPT = "Lua> "
LUA_PROMPT_MULTI = "Lua>> "
function luashell( ctx )
print_sl ("Lua EOS Shell version 0.01\nCopyrights 2021 Varanda Labs\n\n" .. LUA_PROMPT)
-- subscribe for events
res,msg = eos.subscribe_event_by_name(ctx, "EV_SYS_TEXT_FROM_CONSOLE")
if res == false then
print(msg)
end
local f,msg, ok
local err
local chunk = ""
local more = false
while(1) do
local ev, arg = eos.wait_event(ctx)
if more == true then
chunk = chunk .. arg
f, msg = load(chunk)
else
f, msg = load(arg)
end
if f == nil then
if string.find(msg, "<eof>") ~= nil then
if more == false then -- if first time:
chunk = chunk .. arg
more = true
end
print_sl(LUA_PROMPT_MULTI)
else
print(“load error: " .. msg)
chunk = ""
more = false
end
else
--local ok, e = xpcall( f, lua_error_handler )
local ok, msg = pcall(f)
if ok == false then
print(msg)
end
chunk = ""
more = false
print_sl(LUA_PROMPT)
end
end
end
On Fri, 2021年03月12日 at 07:59 -0500, Varanda wrote:
Hello All,
I am implementing a Lua shell using load function.
It is working fine for single line entries. I would like to add
multiline support WITHOUT adding a explicit multi-line line
terminator (like ‘\’ in C and makefiles)
Question: Is there a parser that the reader can use to figure out
when the chunk is completed?
For example, what could be done inside the following “chunk_reader”
for detecting it?
Or should the load caller keep calling it based on “<eof>” presence
in the error message?
Thanks in advance,
Varanda
Vanilla Lua REPL checks if it can compile chunk as entered and expects
continuation if it can't. If such continuation is an empty string,
input buffer gets reset and error is printed.
--
v <
v19930312@gmail.com>