MobileRead Forums - View Single Post - Template: Specifying that an identifier does not exist

chaley · 03-31-2021, 05:58 PM

The problem seems to be you using '=' instead of '==' to do comparisons. The first does an assignment and returns the value being assigned. The second does the comparison.

Does this template do what you expect? I changed lines 15, 16, 20, and 21. Sorry I didn't notice the error before post #2.

Code:

program:
ids = $identifiers;
if select(ids, 'url') then
	status = $#fanficstatus;
	publisher = $publisher;
	a = select(ids, 'ao3');
	f = select(ids, 'ffnet');
	if
		(a || f)
		&& '(Archive of Our Own|Fanfiction.net)' in publisher
		&& '(Completed|Abandoned|Oneshot)' in status
		then "metadata.png:"
	elif
		!a
		&& publisher == 'Archive of Our Own'
		&& status == 'In-Progress'
	then "metadata.png:"
	elif
		!f
		&& publisher == 'FanFiction.net'
		&& status == 'In-Progress'
		then "metadata.png:"
	fi
fi

FWIW: people have mistaken assignment for equality since forever. That is one reason why "newer" languages don't allow assignment as an expression or use a different operator such as ":=". It is too late for me to make either change because it would surely break existing templates.

03-31-2021, 05:58 PM	#7
chaley Grand Sorcerer Posts: 12,398 Karma: 8012652 Join Date: Jan 2010 Location: Notts, England Device: Kobo Libra 2	The problem seems to be you using '=' instead of '==' to do comparisons. The first does an assignment and returns the value being assigned. The second does the comparison. Does this template do what you expect? I changed lines 15, 16, 20, and 21. Sorry I didn't notice the error before post #2. Code: program: ids = $identifiers; if select(ids, 'url') then status = $#fanficstatus; publisher = $publisher; a = select(ids, 'ao3'); f = select(ids, 'ffnet'); if (a \|\| f) && '(Archive of Our Own\|Fanfiction.net)' in publisher && '(Completed\|Abandoned\|Oneshot)' in status then "metadata.png:" elif !a && publisher == 'Archive of Our Own' && status == 'In-Progress' then "metadata.png:" elif !f && publisher == 'FanFiction.net' && status == 'In-Progress' then "metadata.png:" fi fi FWIW: people have mistaken assignment for equality since forever. That is one reason why "newer" languages don't allow assignment as an expression or use a different operator such as ":=". It is too late for me to make either change because it would surely break existing templates.