Choice of processor

[Philip Taylor]

On 05/03/2025 11:50, Joseph Wright wrote:
>
> The above [snipped] relies on various other bits of Lua as LaTeX does 
> various bits
> of emulation and tracks things. For a one-off use, you could go with
>
> \directlua{
>   local t = lua.get_functions_table()
>   local minus_tok = token.new(string.byte('-'), 12)
>   local zero_tok = token.new(string.byte('0'), 12)
>   local one_tok = token.new(string.byte('1'), 12)
>   t[1] = function()
>     local first = token.scan_string()
>     local second = token.scan_string()
>     if first < second then
>       token.put_next(minus_tok, one_tok)
>     else
>       token.put_next(first == second and zero_tok or one_tok)
>     end
>   end
> }
> \luadef\strcmp 1 %
> \strcmp{A}{A}
> \strcmp{A}{B}
> \strcmp{B}{A}
> \bye
>
> which hard-codes that we are using a known Lua function - done like
> this, \strcmp has the same behaviour as a primitive.

Thank you very much, Joseph — much appreciated.  But could I trouble to 
explain the "\luadef\strcmp 1 % " part ?  Does that in some way bind 
\strcmp to the preceding \directlua code ?

-- 
/** Phil./

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