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65 lines
2.4 KiB
Python
65 lines
2.4 KiB
Python
# Copyright: (c) 2018, 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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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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from ast import literal_eval
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from itertools import islice, chain
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import types
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from jinja2._compat import text_type
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from jinja2.runtime import StrictUndefined
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from ansible.parsing.yaml.objects import AnsibleVaultEncryptedUnicode
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def ansible_native_concat(nodes):
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"""Return a native Python type from the list of compiled nodes. If the
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result is a single node, its value is returned. Otherwise, the nodes are
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concatenated as strings. If the result can be parsed with
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:func:`ast.literal_eval`, the parsed value is returned. Otherwise, the
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string is returned.
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"""
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# https://github.com/pallets/jinja/blob/master/jinja2/nativetypes.py
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head = list(islice(nodes, 2))
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if not head:
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return None
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if len(head) == 1:
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out = head[0]
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# TODO send unvaulted data to literal_eval?
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if isinstance(out, AnsibleVaultEncryptedUnicode):
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return out.data
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if isinstance(out, StrictUndefined):
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# A hack to raise proper UndefinedError/AnsibleUndefinedVariable exception.
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# We need to access the AnsibleUndefined(StrictUndefined) object by either of the following:
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# __iter__, __str__, __len__, __nonzero__, __eq__, __ne__, __bool__, __hash__
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# to actually raise the exception.
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# (see Jinja2 source of StrictUndefined to get up to date info)
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# Otherwise the undefined error would be raised on the next access which might not be properly handled.
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# See https://github.com/ansible/ansible/issues/52158
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# We do that only here because it is taken care of by text_type() in the else block below already.
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str(out)
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# short circuit literal_eval when possible
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if not isinstance(out, list):
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return out
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else:
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if isinstance(nodes, types.GeneratorType):
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nodes = chain(head, nodes)
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# Stringifying the nodes is important as it takes care of
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# StrictUndefined by side-effect - by raising an exception.
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out = u''.join([text_type(v) for v in nodes])
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try:
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return literal_eval(out)
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except (ValueError, SyntaxError, MemoryError):
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return out
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