#!/usr/bin/env PYTHONIOENCODING=utf-8  python
# encoding: utf-8

# This is code from Chris Adams, source https://gist.github.com/acdha/49a610089c2798db6fe2

from __future__ import absolute_import, print_function, unicode_literals

import os
import re

import requests


def get_block_for_codepoint(cp):
    """Return the Unicode block name for the provided numeric codepoint"""

    for start, end, block_name in UNICODE_BLOCKS:
        if start <= cp <= end:
            return block_name

    return 'No_Block'


def load_unicode_blocks_from_file(f):
    file_contents = f.read().decode('utf-8')

    blocks = []
    for start, end, block_name in re.findall(r'([0-9A-F]+)\.\.([0-9A-F]+);\ (\S.*\S)', file_contents):
        if block_name == 'No_Block':
            continue

        blocks.append((int(start, 16), int(end, 16), block_name))

    return blocks


def load_unicode_blocks(block_filename):
    if not os.path.exists(block_filename):
        print('Unicode block file %s does not exist. Downloading…' % block_filename)
        r = requests.get('http://unicode.org/Public/UNIDATA/Blocks.txt')
        r.raise_for_status()

        with open(block_filename, 'wb') as f:
            for chunk in r.iter_content():
                f.write(chunk)

    with open(block_filename, 'rb') as f:
        blocks = load_unicode_blocks_from_file(f)

    return blocks

UNICODE_BLOCKS = load_unicode_blocks('UNIDATA-Blocks.txt')