As noted by @nicowilliams, `tostream` used `keys`,
which sorts the keys in alphabetical order, instead
of `keys_unsorted`, which preserves the parsing order.
Fixes#1541.
Now that #1313 is fixed, |= no longer outputs null when the RHS update
expression outputs empty.
When a user wants to keep the current value of the LHS they would have
the RHS update expression output `.`, so having `empty` achieve the same
thing would be redundant. The obvious thing to do is to delete the LHS
when the RHS update outputs `empty` (i.e., doesn't output any values).
It's reasonable to think that existing programs won't be broken by this
change, because reduce and |= not handling empty well is clearly a bug.
(Though it's possible that some programs were using empty to quickly
terminate reduce or |=, it's not likely. They should use label/break
instead.)
Prior to this change |= would use the _last_ value output by the RHS
update expression. With this change |= will use the _first_ value
instead. This change _is_ a minor backwards-incompatible change. It
may or may not be acceptable; we'll see. It is a useful change in that
it makes |= faster when the update expression produces multiple values.
first(g) was extracting two values, which, if g is slow, made first(g)
slow. And if the second extraction were to throw an error, then
first(g) would throw that error, which is clearly not the right thing to
do. Besides that, first(g) was allocating garbage, which it no longer
does.
./jq --run-tests < tests/onig.test
has been run successfully:
...
Testing 'gsub("a";"b")' at line number 70
Testing 'gsub( "(.*)"; ""; "x")' at line number 74
...
22 of 22 tests passed (0 malformed)
Nicolas Williams