Re: Implementing named infix operators with parser hook?

Just out of curiosity, did you consider something like: is 2 => between(1,3)? There's still the need for a comma* (or arrow) between the left operand and "infix" operator, but it's a little less scary looking than 2->$BETWEEN(1, 3). Also it's quite easy to implement, &is would just call the closure returned by &between. And closures are good.

*Unless you want to write that as is { 2 } between 1, 3;, personally I don't like that version.

Comment on Re: Implementing named infix operators with parser hook? Select or Download Code

Replies are listed 'Best First'.
Re^2: Implementing named infix operators with parser hook? by LanX (Saint) on Aug 17, 2018 at 10:52 UTC
> did you consider something like: is 2 => between(1,3)? Yes I did. :) > closures I'm using objects. I have a very good solution yet, using indirect method calls and constants as operands. `col BETWEEN 1,2` I just need an alternative for the cases where the LHS is not a constant, which is rare in most SQL statements. Maybe its time to show a proof of concept... Cheers Rolf , _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply] [d/l]
Re^3: Implementing named infix operators with parser hook? by anonymized user 468275 (Curate) on Aug 17, 2018 at 11:28 UTC
Don't you mean it's rare for LHS to be a constant in SQL statements. Or is the problem that 'rare in most' as opposed to just saying 'rare' can be satisfied by a 51% hit rate (most can be 50.5%, with rare being say 1.5% inside that, but by saying nothing about the other 49.5% allows them all to be hits). One has to be rigorous with verbal expression of statistical propositions. One world, one people	[reply]
Re^4: Implementing named infix operators with parser hook? by LanX (Saint) on Aug 17, 2018 at 11:36 UTC
Rare = significantly less than 5 %. Columns are represented as Perl constants in my DSL. Cheers Rolf under _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply]