yottadb.require where argument has multiple specifications

[AlainDsc]

Dear,

I wanted to use the function yottadb.require for call-in specifications, by giving as argument the specification itself. Like the documentation said: ' If the string contains : it is considered to be the call-in specification itself'.

However, my specification have 2 lines.

Following code seems to work:

ydb = require("yottadb")
local mexec = ydb.require("mexec: ydb_string_t*[1024] %X^%yadlua(I:ydb_string_t*)" ..
    "\013\010" .. "mexecp: ydb_string_t*[1024] %X^%yadlua(I:ydb_string_t*, I:ydb_string_t*)")

My question is : is this working by accident , or is this the right way to do so ?

[berwynhoyt]

Yes, that's a valid way to do it. However, a few stylistic notes:

• "\013\10" is more commonly known as "\r\n" in Lua
• The linux standard line ending is just a single "\n" not "\r\n"
• You don't need to end your quote and concatenate another one just to specify the line ending. So you can include your \n at the end of the text and don't need the extra .. as follows:

local mexec = ydb.require(
    "mexec: ydb_string_t*[1024] %X^%yadlua(I:ydb_string_t*)\n" ..
    "mexecp: ydb_string_t*[1024] %X^%yadlua(I:ydb_string_t*, I:ydb_string_t*)" )

or, using Lua long literals you can even do the following, which captures the \n that is inherent in the source:

local mexec = ydb.require([[
    mexec: ydb_string_t*[1024] %X^%yadlua(I:ydb_string_t*)
    mexecp: ydb_string_t*[1024] %X^%yadlua(I:ydb_string_t*, I:ydb_string_t*)
]]

[AlainDsc]

Thank you, Berwyn, this is definitely an answer to my question.
I just added the '..' for clarity.