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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__))

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