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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
from unicodedata import normalize, category, unidata_version
from gen_helper import getCopyrightNotice, openNamespaces, closeNamespaces, \
include
diacritics = set()
def load_diacritics(unicode_proplist_file):
proplist_file = open(unicode_proplist_file, 'r')
for line in proplist_file:
# Filter out blank lines and lines that start with #
data = line[:line.find('#')]
if(data == ""):
continue
# Parse the data on the line
values = data.split("; ")
assert(len(values) == 2)
uproperty = values[1].strip()
if uproperty == "Diacritic":
if len(values[0].split('..')) == 2:
codepoint_range = values[0].split('..')
start = int(codepoint_range[0], 16)
end = int(codepoint_range[1], 16) + 1
for i in range(start, end):
if i not in diacritics:
diacritics.add(i)
else:
if int(values[0], 16) not in diacritics:
diacritics.add(int(values[0], 16))
diacritic_mappings = {}
def add_diacritic_mapping(codepoint):
# a : original unicode character
# d : decomposed unicode character
# r : decomposed unicode character with diacritics removed
# c : recomposed unicode character with diacritics removed
a = chr(codepoint)
d = normalize('NFD', a)
r = u''
for i in range(len(d)):
if ord(d[i]) not in diacritics:
r += d[i]
c = normalize('NFC', r)
# Only use mappings where the final recomposed form is a single codepoint
if (a != c and len(c) == 1):
assert c != '\0' # This is used to indicate the codepoint is a pure diacritic.
assert ord(c) not in diacritics
diacritic_mappings[codepoint] = ord(c[0])
def add_diacritic_range(start, end):
for x in range(start, end + 1):
add_diacritic_mapping(x)
def generate(target):
"""Generates a C++ source file that contains a diacritic removal mapping
function.
The delimiter checking function contains a switch statement with cases for
every character in Unicode that has a removable combining diacritical mark.
"""
out = open(target, "w")
out.write(getCopyrightNotice())
out.write(include("mongo/db/fts/unicode/codepoints.h"))
out.write("\n")
out.write(openNamespaces())
# Map diacritics from 0 to the maximum Unicode codepoint
add_diacritic_range(0x0000, 0x10FFFF)
for diacritic in diacritics:
diacritic_mappings[diacritic] = 0
out.write("""char32_t codepointRemoveDiacritics(char32_t codepoint) {
switch (codepoint) {\n""")
mappings_list = []
for mapping in diacritic_mappings:
mappings_list.append((mapping, diacritic_mappings[mapping]))
sorted_mappings = sorted(mappings_list, key=lambda mapping: mapping[0])
for mapping in sorted_mappings:
out.write(" case " + str(hex(mapping[0])) + ": return " + \
str(hex(mapping[1])) +";\n")
out.write(" default: return codepoint;\n }\n}")
out.write(closeNamespaces())
if __name__ == "__main__":
if(unidata_version != '8.0.0'):
print("""ERROR: This script must be run with a version of Python that \
contains the Unicode 8.0.0 Character Database.""")
sys.exit(1)
load_diacritics(sys.argv[1])
generate(sys.argv[2])
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