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docs_resolv.py
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# Author: Óscar Nájera
# License: 3-clause BSD
"""
Link resolver objects
=====================
"""
import codecs
import gzip
from io import BytesIO
import os
import pickle
import posixpath
import re
import shelve
import sys
import urllib.request as urllib_request
import urllib.parse as urllib_parse
from urllib.error import HTTPError, URLError
from sphinx.errors import ExtensionError
from sphinx.search import js_index
import sphinx.util
from .utils import status_iterator
logger = sphinx.util.logging.getLogger('sphinx-gallery')
def _get_data(url):
"""Get data over http(s) or from a local file."""
if urllib_parse.urlparse(url).scheme in ('http', 'https'):
user_agent = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11' # noqa: E501
headers = {'User-Agent': user_agent}
req = urllib_request.Request(url, None, headers)
resp = urllib_request.urlopen(req)
encoding = resp.headers.get('content-encoding', 'plain')
data = resp.read()
if encoding == 'gzip':
data = gzip.GzipFile(fileobj=BytesIO(data)).read()
elif encoding != 'plain':
raise ExtensionError(f'unknown encoding {encoding!r}')
data = data.decode('utf-8')
else:
with codecs.open(url, mode='r', encoding='utf-8') as fid:
data = fid.read()
return data
def get_data(url, gallery_dir):
"""Persistent dictionary usage to retrieve the search indexes"""
# shelve keys need to be str in python 2
if sys.version_info[0] == 2 and isinstance(url, str):
url = url.encode('utf-8')
cached_file = os.path.join(gallery_dir, 'searchindex')
search_index = shelve.open(cached_file)
if url in search_index:
data = search_index[url]
else:
data = _get_data(url)
search_index[url] = data
search_index.close()
return data
def parse_sphinx_docopts(index):
"""
Parse the Sphinx index for documentation options.
Parameters
----------
index : str
The Sphinx index page
Returns
-------
docopts : dict
The documentation options from the page.
"""
pos = index.find('var DOCUMENTATION_OPTIONS')
if pos < 0:
raise ExtensionError(
'Documentation options could not be found in index.')
pos = index.find('{', pos)
if pos < 0:
raise ExtensionError(
'Documentation options could not be found in index.')
endpos = index.find('};', pos)
if endpos < 0:
raise ExtensionError(
'Documentation options could not be found in index.')
block = index[pos + 1:endpos].strip()
docopts = {}
for line in block.splitlines():
key, value = line.split(':', 1)
key = key.strip().strip('"')
value = value.strip()
if value[-1] == ',':
value = value[:-1].rstrip()
if value[0] in '"\'':
value = value[1:-1]
elif value == 'false':
value = False
elif value == 'true':
value = True
else:
try:
value = int(value)
except ValueError:
# In Sphinx 1.7.5, URL_ROOT is a JavaScript fragment.
# Ignoring this entry since URL_ROOT is not used
# elsewhere.
# https://github.com/sphinx-gallery/sphinx-gallery/issues/382
continue
docopts[key] = value
return docopts
class SphinxDocLinkResolver:
""" Resolve documentation links using searchindex.js generated by Sphinx
Parameters
----------
doc_url : str
The base URL of the project website.
relative : bool
Return relative links (only useful for links to documentation of this
package).
"""
def __init__(self, config, doc_url, gallery_dir, relative=False):
self.config = config
self.doc_url = doc_url
self.gallery_dir = gallery_dir
self.relative = relative
self._link_cache = {}
if doc_url.startswith(('http://', 'https://')):
if relative:
raise ExtensionError(
'Relative links are only supported for local '
'URLs (doc_url cannot be absolute)')
index_url = doc_url + '/'
searchindex_url = doc_url + '/searchindex.js'
docopts_url = doc_url + '/_static/documentation_options.js'
else:
index_url = os.path.join(doc_url, 'index.html')
searchindex_url = os.path.join(doc_url, 'searchindex.js')
docopts_url = os.path.join(
doc_url, '_static', 'documentation_options.js')
# detect if we are using relative links on a Windows system
if (os.name.lower() == 'nt' and
not doc_url.startswith(('http://', 'https://'))):
if not relative:
raise ExtensionError(
'You have to use relative=True for the local'
' package on a Windows system.')
self._is_windows = True
else:
self._is_windows = False
# Download and find documentation options. As of Sphinx 1.7, these
# options are now kept in a standalone file called
# 'documentation_options.js'. Since SphinxDocLinkResolver can be called
# not only for the documentation which is being built but also ones
# that are being referenced, we need to try and get the index page
# first and if that doesn't work, check for the
# documentation_options.js file.
index = get_data(index_url, gallery_dir)
if 'var DOCUMENTATION_OPTIONS' in index:
self._docopts = parse_sphinx_docopts(index)
else:
docopts = get_data(docopts_url, gallery_dir)
self._docopts = parse_sphinx_docopts(docopts)
# download and initialize the search index
sindex = get_data(searchindex_url, gallery_dir)
self._searchindex = js_index.loads(sindex)
def _get_index_match(self, first, second):
try:
match = self._searchindex['objects'][first]
except KeyError:
return None
else:
if isinstance(match, dict):
try:
match = match[second]
except KeyError:
return None
elif isinstance(match, (list, tuple)): # Sphinx 5.0.0 dev
try:
for item in match:
if item[4] == second:
match = item[:4]
break
else:
return None
except Exception:
return None
return match
def _get_link_type(self, cobj, use_full_module=False):
"""Get a valid link and type_, False if not found."""
module_type = 'module_short'
if use_full_module:
module_type = 'module'
first, second = cobj[module_type], cobj['name']
match = self._get_index_match(first, second)
if match is None and '.' in second: # possible class attribute
first, second = second.split('.', 1)
first = '.'.join([cobj['module_short'], first])
match = self._get_index_match(first, second)
if match is None:
link = type_ = None
else:
fname_idx = match[0]
objname_idx = str(match[1])
anchor = match[3]
type_ = self._searchindex['objtypes'][objname_idx]
fname = self._searchindex['filenames'][fname_idx]
# In 1.5+ Sphinx seems to have changed from .rst.html to only
# .html extension in converted files. Find this from the options.
ext = self._docopts.get('FILE_SUFFIX', '.rst.html')
fname = os.path.splitext(fname)[0] + ext
if self._is_windows:
fname = fname.replace('/', '\\')
link = os.path.join(self.doc_url, fname)
else:
link = posixpath.join(self.doc_url, fname)
fullname = '.'.join([first, second])
if anchor == '':
anchor = fullname
elif anchor == '-':
anchor = (self._searchindex['objnames'][objname_idx][1] + '-' +
fullname)
link = link + '#' + anchor
return link, type_
def resolve(self, cobj, this_url, return_type=False):
"""Resolve the link to the documentation, returns None if not found
Parameters
----------
cobj : dict
Dict with information about the "code object" for which we are
resolving a link.
cobj['name'] : function or class name (str)
cobj['module_short'] : shortened module name (str)
cobj['module'] : module name (str)
this_url: str
URL of the current page. Needed to construct relative URLs
(only used if relative=True in constructor).
return_type : bool
If True, return the type as well.
Returns
-------
link : str or None
The link (URL) to the documentation.
type_ : str
The type. Only returned if return_type is True.
"""
full_name = cobj['module_short'] + '.' + cobj['name']
if full_name not in self._link_cache:
# we don't have it cached
use_full_module = False
for pattern in self.config['prefer_full_module']:
if re.search(pattern, full_name):
use_full_module = True
break
self._link_cache[full_name] = self._get_link_type(
cobj, use_full_module)
link, type_ = self._link_cache[full_name]
if self.relative and link is not None:
link = os.path.relpath(link, start=this_url)
if self._is_windows:
# replace '\' with '/' so it on the web
link = link.replace('\\', '/')
# for some reason, the relative link goes one directory too high up
link = link[3:]
return (link, type_) if return_type else link
def _handle_http_url_error(e, msg='fetching'):
if isinstance(e, HTTPError):
error_msg = f'{msg} {e.url}: {e.code} ({e.msg})'
elif isinstance(e, URLError):
error_msg = f'{msg}: {e.reason}'
logger.warning('The following {} has occurred {}'.format(
type(e).__name__, error_msg))
def _sanitize_css_class(s):
for x in '~!@$%^&*()+=,./\';:"?><[]\\{}|`#':
s = s.replace(x, '-')
return s
def _embed_code_links(app, gallery_conf, gallery_dir):
# Add resolvers for the packages for which we want to show links
doc_resolvers = {}
src_gallery_dir = os.path.join(app.builder.srcdir, gallery_dir)
for this_module, url in gallery_conf['reference_url'].items():
try:
if url is None:
doc_resolvers[this_module] = SphinxDocLinkResolver(
app.config.sphinx_gallery_conf,
app.builder.outdir, src_gallery_dir, relative=True)
else:
doc_resolvers[this_module] = SphinxDocLinkResolver(
app.config.sphinx_gallery_conf,
url, src_gallery_dir)
except (URLError, HTTPError) as e:
_handle_http_url_error(e)
html_gallery_dir = os.path.abspath(os.path.join(app.builder.outdir,
gallery_dir))
# patterns for replacement
link_pattern = (
'<a href="{link}" title="{title}" class="{css_class}">{text}</a>')
orig_pattern = '<span class="n">%s</span>'
period = '<span class="o">.</span>'
# This could be turned into a generator if necessary, but should be okay
flat = [[dirpath, filename]
for dirpath, _, filenames in os.walk(html_gallery_dir)
for filename in filenames]
iterator = status_iterator(
flat, f'embedding documentation hyperlinks for {gallery_dir}... ',
color='fuchsia', length=len(flat),
stringify_func=lambda x: os.path.basename(x[1]))
intersphinx_inv = getattr(app.env, 'intersphinx_named_inventory', dict())
builtin_modules = set(intersphinx_inv.get(
'python', dict()).get('py:module', dict()).keys())
for dirpath, fname in iterator:
full_fname = os.path.join(html_gallery_dir, dirpath, fname)
subpath = dirpath[len(html_gallery_dir) + 1:]
pickle_fname = os.path.join(src_gallery_dir, subpath,
fname[:-5] + '_codeobj.pickle')
if not os.path.exists(pickle_fname):
continue
# we have a pickle file with the objects to embed links for
with open(pickle_fname, 'rb') as fid:
example_code_obj = pickle.load(fid)
# generate replacement strings with the links
str_repl = {}
for name in sorted(example_code_obj):
cobjs = example_code_obj[name]
# possible names from identify_names, which in turn gets
# possibilities from NameFinder.get_mapping
link = type_ = None
for cobj in cobjs:
for modname in (cobj['module_short'], cobj['module']):
this_module = modname.split('.')[0]
cname = cobj['name']
# Try doc resolvers first
if this_module in doc_resolvers:
try:
link, type_ = doc_resolvers[this_module].resolve(
cobj, full_fname, return_type=True)
except (HTTPError, URLError) as e:
_handle_http_url_error(
e, msg=f'resolving {modname}.{cname}')
# next try intersphinx
if this_module == modname == 'builtins':
this_module = 'python'
elif modname in builtin_modules:
this_module = 'python'
if link is None and this_module in intersphinx_inv:
inv = intersphinx_inv[this_module]
if modname == 'builtins':
want = cname
else:
want = f'{modname}.{cname}'
for key, value in inv.items():
# only python domain
if key.startswith('py') and want in value:
link = value[want][2]
type_ = key
break
# differentiate classes from instances
is_instance = (type_ is not None and
'py:class' in type_ and
not cobj['is_class'])
if link is not None:
# Add CSS classes
name_html = period.join(orig_pattern % part
for part in name.split('.'))
full_function_name = f'{modname}.{cname}'
css_class = ("sphx-glr-backref-module-" +
_sanitize_css_class(modname))
if type_ is not None:
css_class += (" sphx-glr-backref-type-" +
_sanitize_css_class(type_))
if is_instance:
css_class += " sphx-glr-backref-instance"
str_repl[name_html] = link_pattern.format(
link=link, title=full_function_name,
css_class=css_class, text=name_html)
break # loop over possible module names
if link is not None:
break # loop over cobjs
# do the replacement in the html file
# ensure greediness
names = sorted(str_repl, key=len, reverse=True)
regex_str = '|'.join(re.escape(name) for name in names)
regex = re.compile(regex_str)
def substitute_link(match):
return str_repl[match.group()]
if len(str_repl) > 0:
with codecs.open(full_fname, 'r', 'utf-8') as fid:
lines_in = fid.readlines()
with codecs.open(full_fname, 'w', 'utf-8') as fid:
for line in lines_in:
line_out = regex.sub(substitute_link, line)
fid.write(line_out)
def embed_code_links(app, exception):
"""Embed hyperlinks to documentation into example code"""
if exception is not None:
return
gallery_conf = app.config.sphinx_gallery_conf
# XXX: Whitelist of builders for which it makes sense to embed
# hyperlinks inside the example html. Note that the link embedding
# require searchindex.js to exist for the links to the local doc
# and there does not seem to be a good way of knowing which
# builders creates a searchindex.js.
if app.builder.name not in ['html', 'readthedocs']:
return
logger.info('embedding documentation hyperlinks...', color='white')
gallery_dirs = gallery_conf['gallery_dirs']
if not isinstance(gallery_dirs, list):
gallery_dirs = [gallery_dirs]
for gallery_dir in gallery_dirs:
_embed_code_links(app, gallery_conf, gallery_dir)