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75 lines
2.1 KiB
Python
75 lines
2.1 KiB
Python
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# (c) 2013, Bradley Young <young.bradley@gmail.com>
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# (c) 2017 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = """
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lookup: cartesian
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version_added: "2.1"
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short_description: returns the cartesian product of lists
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description:
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- Takes the input lists and returns a list that represents the product of the input lists.
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- It is clearer with an example, it turns [1, 2, 3], [a, b] into [1, a], [1, b], [2, a], [2, b], [3, a], [3, b].
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You can see the exact syntax in the examples section.
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options:
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_raw:
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description:
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- a set of lists
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required: True
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"""
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EXAMPLES = """
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- name: Example of the change in the description
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debug: msg="{{ [1,2,3]|lookup('cartesian', [a, b])}}"
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- name: loops over the cartesian product of the supplied lists
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debug: msg="{{item}}"
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with_cartesian:
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- "{{list1}}"
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- "{{list2}}"
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- [1,2,3,4,5,6]
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"""
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RETURN = """
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_list:
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description:
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- list of lists composed of elements of the input lists
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type: lists
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"""
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from itertools import product
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from ansible.errors import AnsibleError
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from ansible.plugins.lookup import LookupBase
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from ansible.utils.listify import listify_lookup_plugin_terms
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class LookupModule(LookupBase):
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"""
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Create the cartesian product of lists
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"""
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def _lookup_variables(self, terms):
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"""
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Turn this:
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terms == ["1,2,3", "a,b"]
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into this:
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terms == [[1,2,3], [a, b]]
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"""
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results = []
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for x in terms:
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intermediate = listify_lookup_plugin_terms(x, templar=self._templar, loader=self._loader)
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results.append(intermediate)
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return results
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def run(self, terms, variables=None, **kwargs):
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terms = self._lookup_variables(terms)
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my_list = terms[:]
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if len(my_list) == 0:
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raise AnsibleError("with_cartesian requires at least one element in each list")
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return [self._flatten(x) for x in product(*my_list)]
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