=============================== python-jsonpath-rw-ext

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Extensions for JSONPath RW

jsonpath-rw-ext extends json-path-rw capabilities by adding multiple extensions. 'len' that allows one to get the length of a list. 'sorted' that returns a sorted version of a list, 'arithmetic' that permits one to make math operation between elements and 'filter' to select only certain elements of a list.

Each extensions will be proposed upstream <https://github.com/kennknowles/python-jsonpath-rw>__ and will stay here only if they are refused.

• Free software: Apache license
• Documentation: https://python-jsonpath-rw-ext.readthedocs.org/en/latest/
• Source: http://github.com/sileht/python-jsonpath-rw-ext

Quick Start

At the command line::

$ pip install jsonpath-rw-ext

Or, if you have virtualenvwrapper installed::

$ mkvirtualenv jsonpath-rw-ext
$ pip install jsonpath-rw-ext

To replace the jsonpath_rw parser by this one with::

import jsonpath_rw_ext
jsonpath_rw_ext.parse("$.foo").find(...)

Or::

from jsonpath_rw_ext import parser
parser.ExtentedJsonPathParser().parse("$.foo").find(...)

Shortcut functions for getting only the matched values::

import jsonpath_rw_ext as jp
print jp.match('$.cow[*]', {'cow': ['foo', 'bar'], 'fish': 'foobar'})
# prints ['foo', 'bar']

print jp.match1('$.cow[*]', {'cow': ['foo', 'bar'], 'fish': 'foobar'})
# prints 'foo'

The jsonpath classes are not part of the public API, because the name/structure can change when they will be implemented upstream. Only the syntax shouldn't change.

Extensions

+--------------+----------------------------------------------+ | name | Example | +==============+==============================================+ | len | - $.objects.len | +--------------+----------------------------------------------+ | sub | - $.field.sub(/foo\\\\+(.*)/, \\\\1) | +--------------+----------------------------------------------+ | split | - $.field.split(+, 2, -1) | | | - $.field.split(sep, segement, maxsplit) | +--------------+----------------------------------------------+ | sorted | - $.objects.sorted | | | - $.objects[\some_field] | | | - $.objects[\some_field,/other_field] | +--------------+----------------------------------------------+ | filter | - $.objects[?(@some_field > 5)] | | | - $.objects[?(some_field = "foobar")] | | | - $.objects[?(some_field ~ "regexp")] | | | - $.objects[?(some_field > 5 & other < 2)] | +--------------+----------------------------------------------+ | arithmetic | - $.foo + "_" + $.bar | | (-+/) | - $.foo * 12 | | | - $.objects[].cow + $.objects[*].cat | +--------------+----------------------------------------------+

About arithmetic and string

Operations are done with python operators and allows types that python allows, and return [] if the operation can be done due to incompatible types.

When operators are used, a jsonpath must be be fully defined otherwise jsonpath-rw-ext can't known if the expression is a string or a jsonpath field, in this case it will choice string as type.

Example with data::

{
    'cow': 'foo',
    'fish': 'bar'
}

| cow + fish returns cowfish | $.cow + $.fish returns foobar | $.cow + "_" + $.fish returns foo_bar | $.cow + "_" + fish returns foo_fish

About arithmetic and list

Arithmetic can be used against two lists if they have the same size.

Example with data::

{'objects': [
    {'cow': 2, 'cat': 3},
    {'cow': 4, 'cat': 6}
]}

| $.objects[*].cow + $.objects[*].cat returns [6, 9]