do_permissionif() - Code Metrics - Inspection of "WIP: Refactoring" - lambdalisue/django-permission - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#68)

by Lambda

created 2017-03-25 06:18 UTC

do_permissionif() B

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Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
cc	4
c	2
b	0
f	0
dl	0
loc	53
rs	8.9849

How to fix Long Method

# vim: set fileencoding=utf-8 :
"""
permissionif templatetag
"""
from django import template
from django.template import TemplateSyntaxError
from django.template.smartif import infix
from django.template.smartif import IfParser
from django.template.smartif import OPERATORS
from django.template.defaulttags import IfNode
from django.template.defaulttags import TemplateLiteral
from permission.conf import settings

register = template.Library()


def of_operator(context, x, y):
    """
    'of' operator of permission if

    This operator is used to specify the target object of permission
    """
    return x.eval(context), y.eval(context)


def has_operator(context, x, y):
    """
    'has' operator of permission if

    This operator is used to specify the user object of permission
    """
    user = x.eval(context)
    perm = y.eval(context)
    if isinstance(perm, (list, tuple)):
        perm, obj = perm
    else:
        obj = None
    return user.has_perm(perm, obj)

# Add 'of' and 'has' operator to existing operators
EXTRA_OPERATORS = {
    'of': infix(20, of_operator),
    'has': infix(10, has_operator),
}
EXTRA_OPERATORS.update(OPERATORS)
for key, op in EXTRA_OPERATORS.items():
    op.id = key


class PermissionIfParser(IfParser):
    """Permission if parser"""
    OPERATORS = EXTRA_OPERATORS
    """use extra operator"""

    def translate_token(self, token):
        try:
            # use own operators instead of builtin operators
            op = self.OPERATORS[token]
        except (KeyError, TypeError):
            return self.create_var(token)
        else:
            return op()


class TemplatePermissionIfParser(PermissionIfParser):
    error_class = TemplateSyntaxError

    def __init__(self, parser, *args, **kwargs):
        self.template_parser = parser
        super(TemplatePermissionIfParser, self).__init__(*args, **kwargs)

    def create_var(self, value):
        return TemplateLiteral(self.template_parser.compile_filter(value), value)


@register.tag('permission')
def do_permissionif(parser, token):
    """
    Permission if templatetag

    Examples
    --------
    ::

        {% if user has 'blogs.add_article' %}
            <p>This user have 'blogs.add_article' permission</p>
        {% elif user has 'blog.change_article' of object %}
            <p>This user have 'blogs.change_article' permission of {{object}}</p>
        {% endif %}

        {# If you set 'PERMISSION_REPLACE_BUILTIN_IF = False' in settings #}
        {% permission user has 'blogs.add_article' %}
            <p>This user have 'blogs.add_article' permission</p>
        {% elpermission user has 'blog.change_article' of object %}
            <p>This user have 'blogs.change_article' permission of {{object}}</p>
        {% endpermission %}

    """
    bits = token.split_contents()
    ELIF = "el%s" % bits[0]
    ELSE = "else"
    ENDIF = "end%s" % bits[0]

    # {% if ... %}
    bits = bits[1:]
    condition = do_permissionif.Parser(parser, bits).parse()
    nodelist = parser.parse((ELIF, ELSE, ENDIF))
    conditions_nodelists = [(condition, nodelist)]
    token = parser.next_token()

    # {% elif ... %} (repeatable)
    while token.contents.startswith(ELIF):
        bits = token.split_contents()[1:]
        condition = do_permissionif.Parser(parser, bits).parse()
        nodelist = parser.parse((ELIF, ELSE, ENDIF))
        conditions_nodelists.append((condition, nodelist))
        token = parser.next_token()

    # {% else %} (optional)
    if token.contents == ELSE:
        nodelist = parser.parse((ENDIF,))
        conditions_nodelists.append((None, nodelist))
        token = parser.next_token()

    # {% endif %}
    assert token.contents == ENDIF

    return IfNode(conditions_nodelists)
do_permissionif.Parser = TemplatePermissionIfParser


# To replace builtin if
def replace_builtin_if(replace=False):
    if replace:
        OPERATORS.update({
            'has': EXTRA_OPERATORS['has'],
            'of': EXTRA_OPERATORS['of'],
        })
    else:
        # remove of, has from OPERATORS
        OPERATORS.pop('of', None)
        OPERATORS.pop('has', None)

replace_builtin_if(settings.PERMISSION_REPLACE_BUILTIN_IF)


1			# vim: set fileencoding=utf-8 :
2			"""
3			permissionif templatetag
4			"""
5			from django import template
6			from django.template import TemplateSyntaxError
7			from django.template.smartif import infix
8			from django.template.smartif import IfParser
9			from django.template.smartif import OPERATORS
10			from django.template.defaulttags import IfNode
11			from django.template.defaulttags import TemplateLiteral
12			from permission.conf import settings
13
14			register = template.Library()
15
16
17			def of_operator(context, x, y):
18			"""
19			'of' operator of permission if
20
21			This operator is used to specify the target object of permission
22			"""
23			return x.eval(context), y.eval(context)
24
25
26			def has_operator(context, x, y):
27			"""
28			'has' operator of permission if
29
30			This operator is used to specify the user object of permission
31			"""
32			user = x.eval(context)
33			perm = y.eval(context)
34			if isinstance(perm, (list, tuple)):
35			perm, obj = perm
36			else:
37			obj = None
38			return user.has_perm(perm, obj)
39
40			# Add 'of' and 'has' operator to existing operators
41			EXTRA_OPERATORS = {
42			'of': infix(20, of_operator),
43			'has': infix(10, has_operator),
44			}
45			EXTRA_OPERATORS.update(OPERATORS)
46			for key, op in EXTRA_OPERATORS.items():
47			op.id = key
48
49
50			class PermissionIfParser(IfParser):
51			"""Permission if parser"""
52			OPERATORS = EXTRA_OPERATORS
53			"""use extra operator"""
54
55			def translate_token(self, token):
56			try:
57			# use own operators instead of builtin operators
58			op = self.OPERATORS[token]
59			except (KeyError, TypeError):
60			return self.create_var(token)
61			else:
62			return op()
63
64
65			class TemplatePermissionIfParser(PermissionIfParser):
66			error_class = TemplateSyntaxError
67
68			def __init__(self, parser, args, *kwargs):
69			self.template_parser = parser
70			super(TemplatePermissionIfParser, self).__init__(args, *kwargs)
71
72			def create_var(self, value):
73			return TemplateLiteral(self.template_parser.compile_filter(value), value)
74
75
76			@register.tag('permission')
77			def do_permissionif(parser, token):
78			"""
79			Permission if templatetag
80
81			Examples
82			--------
83			::
84
85			{% if user has 'blogs.add_article' %}
86			<p>This user have 'blogs.add_article' permission</p>
87			{% elif user has 'blog.change_article' of object %}
88			<p>This user have 'blogs.change_article' permission of {{object}}</p>
89			{% endif %}
90
91			{# If you set 'PERMISSION_REPLACE_BUILTIN_IF = False' in settings #}
92			{% permission user has 'blogs.add_article' %}
93			<p>This user have 'blogs.add_article' permission</p>
94			{% elpermission user has 'blog.change_article' of object %}
95			<p>This user have 'blogs.change_article' permission of {{object}}</p>
96			{% endpermission %}
97
98			"""
99			bits = token.split_contents()
100			ELIF = "el%s" % bits[0]
101			ELSE = "else"
102			ENDIF = "end%s" % bits[0]
103
104			# {% if ... %}
105			bits = bits[1:]
106			condition = do_permissionif.Parser(parser, bits).parse()
107			nodelist = parser.parse((ELIF, ELSE, ENDIF))
108			conditions_nodelists = [(condition, nodelist)]
109			token = parser.next_token()
110
111			# {% elif ... %} (repeatable)
112			while token.contents.startswith(ELIF):
113			bits = token.split_contents()[1:]
114			condition = do_permissionif.Parser(parser, bits).parse()
115			nodelist = parser.parse((ELIF, ELSE, ENDIF))
116			conditions_nodelists.append((condition, nodelist))
117			token = parser.next_token()
118
119			# {% else %} (optional)
120			if token.contents == ELSE:
121			nodelist = parser.parse((ENDIF,))
122			conditions_nodelists.append((None, nodelist))
123			token = parser.next_token()
124
125			# {% endif %}
126			assert token.contents == ENDIF
127
128			return IfNode(conditions_nodelists)
129			do_permissionif.Parser = TemplatePermissionIfParser
130
131
132			# To replace builtin if
133			def replace_builtin_if(replace=False):
134			if replace:
135			OPERATORS.update({
136			'has': EXTRA_OPERATORS['has'],
137			'of': EXTRA_OPERATORS['of'],
138			})
139			else:
140			# remove of, has from OPERATORS
141			OPERATORS.pop('of', None)
142			OPERATORS.pop('has', None)
143
144			replace_builtin_if(settings.PERMISSION_REPLACE_BUILTIN_IF)
145

lambdalisue / django-permission

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Pull Request — master (#68)

do_permissionif() B

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How to fix Long Method

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