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Move camel2snake and snake2camel to common/dict_transformations.py (#39498)

Browse source 
Since it will be used outside just AWS modules, this commit moves
`camel_dict_to_snake_dict` and `snake_dict_to_camel_dict` functions into
a new module_utils file under common/ to match their wider usage.
This commit is contained in:
Ryan Brown 2018-04-30 16:50:32 -04:00 committed by Jordan Borean
parent 2d21c7da17
commit 269d682f70
2 changed files with 111 additions and 97 deletions
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107
lib/ansible/module_utils/common/dict_transformations.py Normal file
View file

@ -0,0 +1,107 @@
# -*- coding: utf-8 -*-
# Copyright: (c) 2018, Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
import re
def camel_dict_to_snake_dict(camel_dict, reversible=False, ignore_list=()):
"""
reversible allows two way conversion of a camelized dict
such that snake_dict_to_camel_dict(camel_dict_to_snake_dict(x)) == x
This is achieved through mapping e.g. HTTPEndpoint to h_t_t_p_endpoint
where the default would be simply http_endpoint, which gets turned into
HttpEndpoint if recamelized.
ignore_list is used to avoid converting a sub-tree of a dict. This is
particularly important for tags, where keys are case-sensitive. We convert
the 'Tags' key but nothing below.
"""
def value_is_list(camel_list):
checked_list = []
for item in camel_list:
if isinstance(item, dict):
checked_list.append(camel_dict_to_snake_dict(item, reversible))
elif isinstance(item, list):
checked_list.append(value_is_list(item))
else:
checked_list.append(item)
return checked_list
snake_dict = {}
for k, v in camel_dict.items():
if isinstance(v, dict) and k not in ignore_list:
snake_dict[_camel_to_snake(k, reversible=reversible)] = camel_dict_to_snake_dict(v, reversible)
elif isinstance(v, list) and k not in ignore_list:
snake_dict[_camel_to_snake(k, reversible=reversible)] = value_is_list(v)
else:
snake_dict[_camel_to_snake(k, reversible=reversible)] = v
return snake_dict
def snake_dict_to_camel_dict(snake_dict, capitalize_first=False):
"""
Perhaps unexpectedly, snake_dict_to_camel_dict returns dromedaryCase
rather than true CamelCase. Passing capitalize_first=True returns
CamelCase. The default remains False as that was the original implementation
"""
def camelize(complex_type, capitalize_first=False):
if complex_type is None:
return
new_type = type(complex_type)()
if isinstance(complex_type, dict):
for key in complex_type:
new_type[_snake_to_camel(key, capitalize_first)] = camelize(complex_type[key], capitalize_first)
elif isinstance(complex_type, list):
for i in range(len(complex_type)):
new_type.append(camelize(complex_type[i], capitalize_first))
else:
return complex_type
return new_type
return camelize(snake_dict, capitalize_first)
def _snake_to_camel(snake, capitalize_first=False):
if capitalize_first:
return ''.join(x.capitalize() or '_' for x in snake.split('_'))
else:
return snake.split('_')[0] + ''.join(x.capitalize() or '_' for x in snake.split('_')[1:])
def _camel_to_snake(name, reversible=False):
def prepend_underscore_and_lower(m):
return '_' + m.group(0).lower()
import re
if reversible:
upper_pattern = r'[A-Z]'
else:
# Cope with pluralized abbreviations such as TargetGroupARNs
# that would otherwise be rendered target_group_ar_ns
upper_pattern = r'[A-Z]{3,}s$'
s1 = re.sub(upper_pattern, prepend_underscore_and_lower, name)
# Handle when there was nothing before the plural_pattern
if s1.startswith("_") and not name.startswith("_"):
s1 = s1[1:]
if reversible:
return s1
# Remainder of solution seems to be https://stackoverflow.com/a/1176023
first_cap_pattern = r'(.)([A-Z][a-z]+)'
all_cap_pattern = r'([a-z0-9])([A-Z]+)'
s2 = re.sub(first_cap_pattern, r'\1_\2', s1)
return re.sub(all_cap_pattern, r'\1_\2', s2).lower()

101
lib/ansible/module_utils/ec2.py
View file

@ -32,6 +32,10 @@ import re
from ansible.module_utils._text import to_native, to_text
from ansible.module_utils.cloud import CloudRetry
from ansible.module_utils.six import string_types, binary_type, text_type
from ansible.module_utils.common.dict_transformations import (
camel_dict_to_snake_dict, snake_dict_to_camel_dict,
_camel_to_snake, _snake_to_camel,
)
try:
import boto
@ -346,103 +350,6 @@ def ec2_connect(module):
return ec2
def _camel_to_snake(name, reversible=False):
def prepend_underscore_and_lower(m):
return '_' + m.group(0).lower()
import re
if reversible:
upper_pattern = r'[A-Z]'
else:
# Cope with pluralized abbreviations such as TargetGroupARNs
# that would otherwise be rendered target_group_ar_ns
upper_pattern = r'[A-Z]{3,}s$'
s1 = re.sub(upper_pattern, prepend_underscore_and_lower, name)
# Handle when there was nothing before the plural_pattern
if s1.startswith("_") and not name.startswith("_"):
s1 = s1[1:]
if reversible:
return s1
# Remainder of solution seems to be https://stackoverflow.com/a/1176023
first_cap_pattern = r'(.)([A-Z][a-z]+)'
all_cap_pattern = r'([a-z0-9])([A-Z]+)'
s2 = re.sub(first_cap_pattern, r'\1_\2', s1)
return re.sub(all_cap_pattern, r'\1_\2', s2).lower()
def camel_dict_to_snake_dict(camel_dict, reversible=False, ignore_list=()):
"""
reversible allows two way conversion of a camelized dict
such that snake_dict_to_camel_dict(camel_dict_to_snake_dict(x)) == x
This is achieved through mapping e.g. HTTPEndpoint to h_t_t_p_endpoint
where the default would be simply http_endpoint, which gets turned into
HttpEndpoint if recamelized.
ignore_list is used to avoid converting a sub-tree of a dict. This is
particularly important for tags, where keys are case-sensitive. We convert
the 'Tags' key but nothing below.
"""
def value_is_list(camel_list):
checked_list = []
for item in camel_list:
if isinstance(item, dict):
checked_list.append(camel_dict_to_snake_dict(item, reversible))
elif isinstance(item, list):
checked_list.append(value_is_list(item))
else:
checked_list.append(item)
return checked_list
snake_dict = {}
for k, v in camel_dict.items():
if isinstance(v, dict) and k not in ignore_list:
snake_dict[_camel_to_snake(k, reversible=reversible)] = camel_dict_to_snake_dict(v, reversible)
elif isinstance(v, list) and k not in ignore_list:
snake_dict[_camel_to_snake(k, reversible=reversible)] = value_is_list(v)
else:
snake_dict[_camel_to_snake(k, reversible=reversible)] = v
return snake_dict
def _snake_to_camel(snake, capitalize_first=False):
if capitalize_first:
return ''.join(x.capitalize() or '_' for x in snake.split('_'))
else:
return snake.split('_')[0] + ''.join(x.capitalize() or '_' for x in snake.split('_')[1:])
def snake_dict_to_camel_dict(snake_dict, capitalize_first=False):
"""
Perhaps unexpectedly, snake_dict_to_camel_dict returns dromedaryCase
rather than true CamelCase. Passing capitalize_first=True returns
CamelCase. The default remains False as that was the original implementation
"""
def camelize(complex_type, capitalize_first=False):
if complex_type is None:
return
new_type = type(complex_type)()
if isinstance(complex_type, dict):
for key in complex_type:
new_type[_snake_to_camel(key, capitalize_first)] = camelize(complex_type[key], capitalize_first)
elif isinstance(complex_type, list):
for i in range(len(complex_type)):
new_type.append(camelize(complex_type[i], capitalize_first))
else:
return complex_type
return new_type
return camelize(snake_dict, capitalize_first)
def ansible_dict_to_boto3_filter_list(filters_dict):
""" Convert an Ansible dict of filters to list of dicts that boto3 can use