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#!/usr/bin/env python3
# ***** BEGIN GPL LICENSE BLOCK *****
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ***** END GPL LICENSE BLOCK *****
# <pep8 compliant>
# Pre-process right-to-left languages.
# You can use it either standalone, or through import_po_from_branches or
# update_trunk.
#
# Notes: This has been tested on Linux, not 100% it will work nicely on
# Windows or OsX.
# This uses ctypes, as there is no py3 binding for fribidi currently.
# This implies you only need the compiled C library to run it.
# Finally, note that it handles some formatting/escape codes (like
# \", %s, %x12, %.4f, etc.), protecting them from ugly (evil) fribidi,
# which seems completely unaware of such things (as unicode is...).
import ctypes
import re
# define FRIBIDI_MASK_NEUTRAL 0x00000040L /* Is neutral */
FRIBIDI_PAR_ON = 0x00000040
# define FRIBIDI_FLAG_SHAPE_MIRRORING 0x00000001
# define FRIBIDI_FLAG_REORDER_NSM 0x00000002
# define FRIBIDI_FLAG_SHAPE_ARAB_PRES 0x00000100
# define FRIBIDI_FLAG_SHAPE_ARAB_LIGA 0x00000200
# define FRIBIDI_FLAG_SHAPE_ARAB_CONSOLE 0x00000400
# define FRIBIDI_FLAG_REMOVE_BIDI 0x00010000
# define FRIBIDI_FLAG_REMOVE_JOINING 0x00020000
# define FRIBIDI_FLAG_REMOVE_SPECIALS 0x00040000
# define FRIBIDI_FLAGS_DEFAULT ( \
# FRIBIDI_FLAG_SHAPE_MIRRORING | \
# FRIBIDI_FLAG_REORDER_NSM | \
# FRIBIDI_FLAG_REMOVE_SPECIALS )
# define FRIBIDI_FLAGS_ARABIC ( \
# FRIBIDI_FLAG_SHAPE_ARAB_PRES | \
# FRIBIDI_FLAG_SHAPE_ARAB_LIGA )
FRIBIDI_FLAG_SHAPE_MIRRORING = 0x00000001
FRIBIDI_FLAG_REORDER_NSM = 0x00000002
FRIBIDI_FLAG_REMOVE_SPECIALS = 0x00040000
FRIBIDI_FLAG_SHAPE_ARAB_PRES = 0x00000100
FRIBIDI_FLAG_SHAPE_ARAB_LIGA = 0x00000200
FRIBIDI_FLAGS_DEFAULT = FRIBIDI_FLAG_SHAPE_MIRRORING | FRIBIDI_FLAG_REORDER_NSM | FRIBIDI_FLAG_REMOVE_SPECIALS
FRIBIDI_FLAGS_ARABIC = FRIBIDI_FLAG_SHAPE_ARAB_PRES | FRIBIDI_FLAG_SHAPE_ARAB_LIGA
MENU_DETECT_REGEX = re.compile("%x\\d+\\|")
##### Kernel processing funcs. #####
def protect_format_seq(msg):
"""
Find some specific escaping/formatting sequences (like \", %s, etc.,
and protect them from any modification!
"""
# LRM = "\u200E"
# RLM = "\u200F"
LRE = "\u202A"
# RLE = "\u202B"
PDF = "\u202C"
LRO = "\u202D"
# RLO = "\u202E"
# uctrl = {LRE, RLE, PDF, LRO, RLO}
# Most likely incomplete, but seems to cover current needs.
format_codes = set("tslfd")
digits = set(".0123456789")
if not msg:
return msg
elif MENU_DETECT_REGEX.search(msg):
# An ugly "menu" message, just force it whole LRE if not yet done.
if msg[0] not in {LRE, LRO}:
msg = LRE + msg
idx = 0
ret = []
ln = len(msg)
while idx < ln:
dlt = 1
# # If we find a control char, skip any additional protection!
# if msg[idx] in uctrl:
# ret.append(msg[idx:])
# break
# \" or \'
if idx < (ln - 1) and msg[idx] == '\\' and msg[idx + 1] in "\"\'":
dlt = 2
# %x12|
elif idx < (ln - 2) and msg[idx] == '%' and msg[idx + 1] in "x" and msg[idx + 2] in digits:
dlt = 2
while (idx + dlt) < ln and msg[idx + dlt] in digits:
dlt += 1
if (idx + dlt) < ln and msg[idx + dlt] == '|':
dlt += 1
# %.4f
elif idx < (ln - 3) and msg[idx] == '%' and msg[idx + 1] in digits:
dlt = 2
while (idx + dlt) < ln and msg[idx + dlt] in digits:
dlt += 1
if (idx + dlt) < ln and msg[idx + dlt] in format_codes:
dlt += 1
else:
dlt = 1
# %s
elif idx < (ln - 1) and msg[idx] == '%' and msg[idx + 1] in format_codes:
dlt = 2
if dlt > 1:
ret.append(LRE)
ret += msg[idx:idx + dlt]
idx += dlt
if dlt > 1:
ret.append(PDF)
return "".join(ret)
def log2vis(msgs, settings):
"""
Globally mimics deprecated fribidi_log2vis.
msgs should be an iterable of messages to rtl-process.
"""
fbd = ctypes.CDLL(settings.FRIBIDI_LIB)
for msg in msgs:
msg = protect_format_seq(msg)
fbc_str = ctypes.create_unicode_buffer(msg)
ln = len(fbc_str) - 1
# print(fbc_str.value, ln)
btypes = (ctypes.c_int * ln)()
embed_lvl = (ctypes.c_uint8 * ln)()
pbase_dir = ctypes.c_int(FRIBIDI_PAR_ON)
jtypes = (ctypes.c_uint8 * ln)()
flags = FRIBIDI_FLAGS_DEFAULT | FRIBIDI_FLAGS_ARABIC
# Find out direction of each char.
fbd.fribidi_get_bidi_types(fbc_str, ln, ctypes.byref(btypes))
# print(*btypes)
fbd.fribidi_get_par_embedding_levels(btypes, ln,
ctypes.byref(pbase_dir),
embed_lvl)
# print(*embed_lvl)
# Joinings for arabic chars.
fbd.fribidi_get_joining_types(fbc_str, ln, jtypes)
# print(*jtypes)
fbd.fribidi_join_arabic(btypes, ln, embed_lvl, jtypes)
# print(*jtypes)
# Final Shaping!
fbd.fribidi_shape(flags, embed_lvl, ln, jtypes, fbc_str)
# print(fbc_str.value)
# print(*(ord(c) for c in fbc_str))
# And now, the reordering.
# Note that here, we expect a single line, so no need to do
# fancy things...
fbd.fribidi_reorder_line(flags, btypes, ln, 0, pbase_dir, embed_lvl,
fbc_str, None)
# print(fbc_str.value)
# print(*(ord(c) for c in fbc_str))
yield fbc_str.value
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