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swh_templatetags.py
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# Copyright (C) 2017-2018 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU Affero General Public License version 3, or any later version
# See top-level LICENSE file for more information
import json
import re
from django import template
from django.core.serializers.json import DjangoJSONEncoder
from django.utils.safestring import mark_safe
from docutils.core import publish_parts
from docutils.writers.html4css1 import Writer, HTMLTranslator
from inspect import cleandoc
from swh.web.common.origin_save import get_savable_origin_types
register = template.Library()
class NoHeaderHTMLTranslator(HTMLTranslator):
"""
Docutils translator subclass to customize the generation of HTML
from reST-formatted docstrings
"""
def __init__(self, document):
super().__init__(document)
self.body_prefix = []
self.body_suffix = []
def visit_bullet_list(self, node):
self.context.append((self.compact_simple, self.compact_p))
self.compact_p = None
self.compact_simple = self.is_compactable(node)
self.body.append(self.starttag(node, 'ul', CLASS='docstring'))
DOCSTRING_WRITER = Writer()
DOCSTRING_WRITER.translator_class = NoHeaderHTMLTranslator
@register.filter
def safe_docstring_display(docstring):
"""
Utility function to htmlize reST-formatted documentation in browsable
api.
"""
docstring = cleandoc(docstring)
return publish_parts(docstring, writer=DOCSTRING_WRITER)['html_body']
@register.filter
def urlize_links_and_mails(text):
"""Utility function for decorating api links in browsable api.
Args:
text: whose content matching links should be transformed into
contextual API or Browse html links.
Returns
The text transformed if any link is found.
The text as is otherwise.
"""
if 'href="' not in text:
text = re.sub(r'(/api/[^"<]*|/browse/[^"<]*|http.*$)',
r'<a href="\1">\1</a>',
text)
return re.sub(r'([^ <>"]+@[^ <>"]+)',
r'<a href="mailto:\1">\1</a>',
text)
else:
return text
@register.filter
def urlize_header_links(text):
"""Utility function for decorating headers links in browsable api.
Args
text: Text whose content contains Link header value
Returns:
The text transformed with html link if any link is found.
The text as is otherwise.
"""
links = text.split(',')
ret = ''
for i, link in enumerate(links):
ret += re.sub(r'<(/api/.*|/browse/.*)>', r'<<a href="\1">\1</a>>',
link)
# add one link per line and align them
if i != len(links) - 1:
ret += '\n '
return ret
@register.filter
def jsonify(obj):
"""Utility function for converting a django template variable
to JSON in order to use it in script tags.
Args
obj: Any django template context variable
Returns:
JSON representation of the variable.
"""
return mark_safe(json.dumps(obj, cls=DjangoJSONEncoder))
@register.filter
def sub(value, arg):
"""Django template filter for subtracting two numbers
Args:
value (int/float): the value to subtract from
arg (int/float): the value to subtract to
Returns:
int/float: The subtraction result
"""
return value - arg
@register.filter
def mul(value, arg):
"""Django template filter for multiplying two numbers
Args:
value (int/float): the value to multiply from
arg (int/float): the value to multiply with
Returns:
int/float: The multiplication result
"""
return value * arg
@register.filter
def key_value(dict, key):
"""Django template filter to get a value in a dictionary.
Args:
dict (dict): a dictionary
key (str): the key to lookup value
Returns:
The requested value in the dictionary
"""
return dict[key]
@register.filter
def origin_type_savable(origin_type):
"""Django template filter to check if a save request can be
created for a given origin type.
Args:
origin_type (str): the type of software origin
Returns:
If the origin type is savable or not
"""
return origin_type in get_savable_origin_types()

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