Json Calculator¶
Apply a user-defined function on Json entries matching a query.
Documentation¶
For more information about how to write Json queries, see Json query syntax.
If Match anywhere is not checked (the default) the query must
match starting at the root of the Json structure. E.g. the query
articles only matches if the root entry is a dictionary containing the
key “articles”. Conversely, if Match anywhere is checked the
query articles can matches the key “articles” in any dictionary in the
whole structure. It can even match at several places despite the query just
being a simple key.
The calculation¶
The supplied python function can be entered either as a lambda expression
or as a function definition using def. It is called once for each
matching entry in the Json structure. The matching entry is passed to the
function and is replaced in the output by whatever is returned by the
function.
Definition¶
Input ports¶
- input json
Input
Output ports¶
- output json
Output
Configuration¶
- Match anywhere (anywhere)
Match the query at any position in the Json structure.
- Calculation (calculation)
Calculation function (either a lambda or def) which takes a Json entry as only argument and returns a new Json entry.
- Query (query)
Query for selecting entries in the Json structure. The visual editor can help you create a query which selects a single entry. The query can then be edited manually to include slices (e.g. [2:4]) or patterns (e.g. some*key) which will select multiple entries. For more details see the node’s documentation.
Examples¶
Implementation¶
- class node_filterjson.JsonCalculator[source]
