mirror of
https://github.com/postgres/postgres.git
synced 2025-10-29 22:49:41 +03:00
194 lines
8.9 KiB
Python
194 lines
8.9 KiB
Python
#!/usr/bin/python2
|
|
# -*- coding: utf-8 -*-
|
|
#
|
|
# This script builds unaccent.rules on standard output when given the
|
|
# contents of UnicodeData.txt [1] and Latin-ASCII.xml [2] given as
|
|
# arguments. Optionally includes ligature expansion and Unicode CLDR
|
|
# Latin-ASCII transliterator, enabled by default, this can be disabled
|
|
# with "--no-ligatures-expansion" command line option.
|
|
#
|
|
# The approach is to use the Unicode decomposition data to identify
|
|
# precomposed codepoints that are equivalent to a ligature of several
|
|
# letters, or a base letter with any number of diacritical marks.
|
|
#
|
|
# This approach handles most letters with diacritical marks and some
|
|
# ligatures. However, several characters (notably a majority of
|
|
# ligatures) don't have decomposition. To handle all these cases, one can
|
|
# use a standard Unicode transliterator available in Common Locale Data
|
|
# Repository (CLDR): Latin-ASCII. This transliterator associates Unicode
|
|
# characters to ASCII-range equivalent. Unless "--no-ligatures-expansion"
|
|
# option is enabled, the XML file of this transliterator [2] -- given as a
|
|
# command line argument -- will be parsed and used.
|
|
#
|
|
# [1] http://unicode.org/Public/8.0.0/ucd/UnicodeData.txt
|
|
# [2] http://unicode.org/cldr/trac/export/12304/tags/release-28/common/transforms/Latin-ASCII.xml
|
|
|
|
|
|
import re
|
|
import argparse
|
|
import sys
|
|
import xml.etree.ElementTree as ET
|
|
|
|
def print_record(codepoint, letter):
|
|
print (unichr(codepoint) + "\t" + letter).encode("UTF-8")
|
|
|
|
class Codepoint:
|
|
def __init__(self, id, general_category, combining_ids):
|
|
self.id = id
|
|
self.general_category = general_category
|
|
self.combining_ids = combining_ids
|
|
|
|
def is_plain_letter(codepoint):
|
|
"""Return true if codepoint represents a plain ASCII letter."""
|
|
return (codepoint.id >= ord('a') and codepoint.id <= ord('z')) or \
|
|
(codepoint.id >= ord('A') and codepoint.id <= ord('Z'))
|
|
|
|
def is_mark(codepoint):
|
|
"""Returns true for diacritical marks (combining codepoints)."""
|
|
return codepoint.general_category in ("Mn", "Me", "Mc")
|
|
|
|
def is_letter_with_marks(codepoint, table):
|
|
"""Returns true for plain letters combined with one or more marks."""
|
|
# See http://www.unicode.org/reports/tr44/tr44-14.html#General_Category_Values
|
|
return len(codepoint.combining_ids) > 1 and \
|
|
is_plain_letter(table[codepoint.combining_ids[0]]) and \
|
|
all(is_mark(table[i]) for i in codepoint.combining_ids[1:])
|
|
|
|
def is_letter(codepoint, table):
|
|
"""Return true for letter with or without diacritical marks."""
|
|
return is_plain_letter(codepoint) or is_letter_with_marks(codepoint, table)
|
|
|
|
def get_plain_letter(codepoint, table):
|
|
"""Return the base codepoint without marks."""
|
|
if is_letter_with_marks(codepoint, table):
|
|
return table[codepoint.combining_ids[0]]
|
|
elif is_plain_letter(codepoint):
|
|
return codepoint
|
|
else:
|
|
raise "mu"
|
|
|
|
def is_ligature(codepoint, table):
|
|
"""Return true for letters combined with letters."""
|
|
return all(is_letter(table[i], table) for i in codepoint.combining_ids)
|
|
|
|
def get_plain_letters(codepoint, table):
|
|
"""Return a list of plain letters from a ligature."""
|
|
assert(is_ligature(codepoint, table))
|
|
return [get_plain_letter(table[id], table) for id in codepoint.combining_ids]
|
|
|
|
def parse_cldr_latin_ascii_transliterator(latinAsciiFilePath):
|
|
"""Parse the XML file and return a set of tuples (src, trg), where "src"
|
|
is the original character and "trg" the substitute."""
|
|
charactersSet = set()
|
|
|
|
# RegEx to parse rules
|
|
rulePattern = re.compile(ur'^(?:(.)|(\\u[0-9a-fA-F]{4})) \u2192 (?:\'(.+)\'|(.+)) ;')
|
|
|
|
# construct tree from XML
|
|
transliterationTree = ET.parse(latinAsciiFilePath)
|
|
transliterationTreeRoot = transliterationTree.getroot()
|
|
|
|
for rule in transliterationTreeRoot.findall("./transforms/transform/tRule"):
|
|
matches = rulePattern.search(rule.text)
|
|
|
|
# The regular expression capture four groups corresponding
|
|
# to the characters.
|
|
#
|
|
# Group 1: plain "src" char. Empty if group 2 is not.
|
|
# Group 2: unicode-escaped "src" char (e.g. "\u0110"). Empty if group 1 is not.
|
|
#
|
|
# Group 3: plain "trg" char. Empty if group 4 is not.
|
|
# Group 4: plain "trg" char between quotes. Empty if group 3 is not.
|
|
if matches is not None:
|
|
src = matches.group(1) if matches.group(1) is not None else matches.group(2).decode('unicode-escape')
|
|
trg = matches.group(3) if matches.group(3) is not None else matches.group(4)
|
|
|
|
# "'" and """ are escaped
|
|
trg = trg.replace("\\'", "'").replace('\\"', '"')
|
|
|
|
# the parser of unaccent only accepts non-whitespace characters
|
|
# for "src" and "trg" (see unaccent.c)
|
|
if not src.isspace() and not trg.isspace():
|
|
charactersSet.add((ord(src), trg))
|
|
|
|
return charactersSet
|
|
|
|
def special_cases():
|
|
"""Returns the special cases which are not handled by other methods"""
|
|
charactersSet = set()
|
|
|
|
# Cyrillic
|
|
charactersSet.add((0x0401, u"\u0415")) # CYRILLIC CAPITAL LETTER IO
|
|
charactersSet.add((0x0451, u"\u0435")) # CYRILLIC SMALL LETTER IO
|
|
|
|
# Symbols of "Letterlike Symbols" Unicode Block (U+2100 to U+214F)
|
|
charactersSet.add((0x2103, u"\xb0C")) # DEGREE CELSIUS
|
|
charactersSet.add((0x2109, u"\xb0F")) # DEGREE FAHRENHEIT
|
|
charactersSet.add((0x2117, "(P)")) # SOUND RECORDING COPYRIGHT
|
|
|
|
return charactersSet
|
|
|
|
def main(args):
|
|
# http://www.unicode.org/reports/tr44/tr44-14.html#Character_Decomposition_Mappings
|
|
decomposition_type_pattern = re.compile(" *<[^>]*> *")
|
|
|
|
table = {}
|
|
all = []
|
|
|
|
# unordered set for ensure uniqueness
|
|
charactersSet = set()
|
|
|
|
# read file UnicodeData.txt
|
|
unicodeDataFile = open(args.unicodeDataFilePath, 'r')
|
|
|
|
# read everything we need into memory
|
|
for line in unicodeDataFile:
|
|
fields = line.split(";")
|
|
if len(fields) > 5:
|
|
# http://www.unicode.org/reports/tr44/tr44-14.html#UnicodeData.txt
|
|
general_category = fields[2]
|
|
decomposition = fields[5]
|
|
decomposition = re.sub(decomposition_type_pattern, ' ', decomposition)
|
|
id = int(fields[0], 16)
|
|
combining_ids = [int(s, 16) for s in decomposition.split(" ") if s != ""]
|
|
codepoint = Codepoint(id, general_category, combining_ids)
|
|
table[id] = codepoint
|
|
all.append(codepoint)
|
|
|
|
# walk through all the codepoints looking for interesting mappings
|
|
for codepoint in all:
|
|
if codepoint.general_category.startswith('L') and \
|
|
len(codepoint.combining_ids) > 1:
|
|
if is_letter_with_marks(codepoint, table):
|
|
charactersSet.add((codepoint.id,
|
|
chr(get_plain_letter(codepoint, table).id)))
|
|
elif args.noLigaturesExpansion is False and is_ligature(codepoint, table):
|
|
charactersSet.add((codepoint.id,
|
|
"".join(unichr(combining_codepoint.id)
|
|
for combining_codepoint \
|
|
in get_plain_letters(codepoint, table))))
|
|
|
|
# add CLDR Latin-ASCII characters
|
|
if not args.noLigaturesExpansion:
|
|
charactersSet |= parse_cldr_latin_ascii_transliterator(args.latinAsciiFilePath)
|
|
charactersSet |= special_cases()
|
|
|
|
# sort for more convenient display
|
|
charactersList = sorted(charactersSet, key=lambda characterPair: characterPair[0])
|
|
|
|
for characterPair in charactersList:
|
|
print_record(characterPair[0], characterPair[1])
|
|
|
|
if __name__ == "__main__":
|
|
parser = argparse.ArgumentParser(description='This script builds unaccent.rules on standard output when given the contents of UnicodeData.txt and Latin-ASCII.xml given as arguments.')
|
|
parser.add_argument("--unicode-data-file", help="Path to formatted text file corresponding to UnicodeData.txt. See <http://unicode.org/Public/8.0.0/ucd/UnicodeData.txt>.", type=str, required=True, dest='unicodeDataFilePath')
|
|
parser.add_argument("--latin-ascii-file", help="Path to XML file from Unicode Common Locale Data Repository (CLDR) corresponding to Latin-ASCII transliterator (Latin-ASCII.xml). See <http://unicode.org/cldr/trac/export/12304/tags/release-28/common/transforms/Latin-ASCII.xml>.", type=str, dest='latinAsciiFilePath')
|
|
parser.add_argument("--no-ligatures-expansion", help="Do not expand ligatures and do not use Unicode CLDR Latin-ASCII transliterator. By default, this option is not enabled and \"--latin-ascii-file\" argument is required. If this option is enabled, \"--latin-ascii-file\" argument is optional and ignored.", action="store_true", dest='noLigaturesExpansion')
|
|
args = parser.parse_args()
|
|
|
|
if args.noLigaturesExpansion is False and args.latinAsciiFilePath is None:
|
|
sys.stderr.write('You must specify the path to Latin-ASCII transliterator file with \"--latin-ascii-file\" option or use \"--no-ligatures-expansion\" option. Use \"-h\" option for help.')
|
|
sys.exit(1)
|
|
|
|
main(args)
|