bauerca / jv Goto Github PK

Currently, only one value can be extracted from a JSON stream; for example, fetching 2 values from a large array requires two stream passes. A JSON path string syntax for complex slicing would allow extracting multiple values from a single stream.

Some things to consider:

• Output order must match order in stream. (requesting, for example, [arr[1], arr[0]] is impossible)
• Other things. :)

An enhanced path string could basically be JSON where values are path strings. For example:

{"dogs": dogs[0:3], "cat_breeds": cats[:].breed}

where the example also introduces an array slicing syntax similar to python and a map function that allows picking attributes over an array of objects.

Do it.

For example, if you do this on the command line,

printf '%s' '{"a":1}' | jv b
echo "$?"

you get 3 (which is an END_OF_STREAM code). However, if you do

printf '%s\n' '{"a":1}' | jv b
echo "$?"

you get 0. I think the latter case is the bug; then one can inspect the return code to see if the json path matched anything.