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# Filter and adjust streamed values so that only values from the .th
# level are output.
def trunc(inputs):
. as $n | inputs | . as $input | if (.[0]|length) > 1 then setpath([0];$input[0][1:]) else empty end;
# Reduce streamed values back to normal
def tovalues(i):
foreach i as $item (
# [<current value being built>,
# <is current value valid?>,
# <previous, complete value>,
# <is previous value valid?>]
[null,false,null,false];
# Updator
#
# If the new $item is a top-level value,
# then clear out the current value
if ($item[0]|length) == 0 then [null,false,.[2],.[3]]
# else if the new $item terminates the current value,
# then rotate the current value into the previous value slot.
elif ($item|length) == 1 and ($item[0]|length) < 2 then [null,false,.[0],.[1]]
else . end |
. as $state |
# If the new $item has a leaf, upate the current value
if ($item|length) > 1 and ($item[0]|length) > 0 then
[.[0]|setpath(($item|.[0]); ($item|.[1])), # update current value
true, # current value is now valid (if, perhaps, incomplete)
$state[2], # previous value is unchanged
$state[3]] # previous value is unchanged
else .
end;
# Extractor
#
# If previous value is valid, output it
if ($item[0]|length) == 1 and ($item|length == 1) and .[3] then .[2] else empty end,
# and/or if the new $item is a top-level scalar, output it
if ($item[0]|length) == 0 then $item[1] else empty end
);
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