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#!/usr/bin/env python3
"""
Utility for parsing HTML5 entity definitions available from:
http://dev.w3.org/html5/spec/entities.json
Written by Ezio Melotti and Iuliia Proskurnia.
"""
import os
import sys
import json
from urllib.request import urlopen
from html.entities import html5
entities_url = 'http://dev.w3.org/html5/spec/entities.json'
def get_json(url):
"""Download the json file from the url and returns a decoded object."""
with urlopen(url) as f:
data = f.read().decode('utf-8')
return json.loads(data)
def create_dict(entities):
"""Create the html5 dict from the decoded json object."""
new_html5 = {}
for name, value in entities.items():
new_html5[name.lstrip('&')] = value['characters']
return new_html5
def compare_dicts(old, new):
"""Compare the old and new dicts and print the differences."""
added = new.keys() - old.keys()
if added:
print('{} entitie(s) have been added:'.format(len(added)))
for name in sorted(added):
print(' {!r}: {!r}'.format(name, new[name]))
removed = old.keys() - new.keys()
if removed:
print('{} entitie(s) have been removed:'.format(len(removed)))
for name in sorted(removed):
print(' {!r}: {!r}'.format(name, old[name]))
changed = set()
for name in (old.keys() & new.keys()):
if old[name] != new[name]:
changed.add((name, old[name], new[name]))
if changed:
print('{} entitie(s) have been modified:'.format(len(changed)))
for item in sorted(changed):
print(' {!r}: {!r} -> {!r}'.format(*item))
def write_items(entities, file=sys.stdout):
"""Write the items of the dictionary in the specified file."""
# The keys in the generated dictionary should be sorted
# in a case-insensitive way, however, when two keys are equal,
# the uppercase version should come first so that the result
# looks like: ['Aacute', 'aacute', 'Aacute;', 'aacute;', ...]
# To do this we first sort in a case-sensitive way (so all the
# uppercase chars come first) and then sort with key=str.lower.
# Since the sorting is stable the uppercase keys will eventually
# be before their equivalent lowercase version.
keys = sorted(entities.keys())
keys = sorted(keys, key=str.lower)
print('html5 = {', file=file)
for name in keys:
print(' {!r}: {!a},'.format(name, entities[name]), file=file)
print('}', file=file)
if __name__ == '__main__':
# without args print a diff between html.entities.html5 and new_html5
# with --create print the new html5 dict
# with --patch patch the Lib/html/entities.py file
new_html5 = create_dict(get_json(entities_url))
if '--create' in sys.argv:
print('# map the HTML5 named character references to the '
'equivalent Unicode character(s)')
print('# Generated by {}. Do not edit manually.'.format(__file__))
write_items(new_html5)
elif '--patch' in sys.argv:
fname = 'Lib/html/entities.py'
temp_fname = fname + '.temp'
with open(fname) as f1, open(temp_fname, 'w') as f2:
skip = False
for line in f1:
if line.startswith('html5 = {'):
write_items(new_html5, file=f2)
skip = True
continue
if skip:
# skip the old items until the }
if line.startswith('}'):
skip = False
continue
f2.write(line)
os.remove(fname)
os.rename(temp_fname, fname)
else:
if html5 == new_html5:
print('The current dictionary is updated.')
else:
compare_dicts(html5, new_html5)
print('Run "./python {0} --patch" to update Lib/html/entities.html '
'or "./python {0} --create" to see the generated ' 'dictionary.'.format(__file__))