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#!/usr/bin/env python3
#
# Script to generate tables for cpp_wcwidth, leveraging glibc's utf8_gen.py.
#
# This file is part of GCC.
#
# GCC 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 3, or (at your option) any later
# version.
#
# GCC 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 GCC; see the file COPYING3. If not see
# <http://www.gnu.org/licenses/>. */
import sys
import os
if len(sys.argv) != 2:
print("usage: %s <unicode version>", file=sys.stderr)
sys.exit(1)
unicode_version = sys.argv[1]
# Parse a codepoint in the format output by glibc tools.
def parse_ucn(s):
if not (s.startswith("<U") and s.endswith(">")):
raise ValueError
return int(s[2:-1], base=16)
# Process a line of width output from utf_gen.py and update global array.
widths = [1] * (1 + 0x10FFFF)
def process_width(line):
# Example lines:
# <UA8FF> 0
# <UA926>...<UA92D> 0
s = line.split()
width = int(s[1])
r = s[0].split("...")
if len(r) == 1:
begin = parse_ucn(r[0])
end = begin + 1
elif len(r) == 2:
begin = parse_ucn(r[0])
end = parse_ucn(r[1]) + 1
else:
raise ValueError
widths[begin:end] = [width] * (end - begin)
# To keep things simple, we use glibc utf8_gen.py as-is. It only outputs to a
# file named UTF-8, which is not configurable. Then we parse this into the form
# we want it.
os.system("from_glibc/utf8_gen.py --unicode_version %s" % unicode_version)
processing = False
for line in open("UTF-8", "r"):
if processing:
if line == "END WIDTH\n":
processing = False
else:
try:
process_width(line)
except (ValueError, IndexError):
print(e, "warning: ignored unexpected line: %s" % line,
file=sys.stderr, end="")
elif line == "WIDTH\n":
processing = True
# All bytes < 256 we treat as width 1.
widths[0:255] = [1] * 255
# Condense the list to contiguous ranges.
cur_range = [-1, 1]
all_ranges = []
for i, width in enumerate(widths):
if width == cur_range[1]:
cur_range[0] = i
else:
all_ranges.append(cur_range)
cur_range = [i, width]
# Output the arrays for generated_cpp_wcwidth.h
print("/* Generated by contrib/unicode/gen_wcwidth.py,",
"with the help of glibc's")
print(" utf8_gen.py, using version %s" % unicode_version,
"of the Unicode standard. */")
print("\nstatic const cppchar_t wcwidth_range_ends[] = {", end="")
for i, r in enumerate(all_ranges):
if i % 8:
print(" ", end="")
else:
print("\n ", end="")
print("0x%x," % (r[0]), end="")
print("\n};\n")
print("static const unsigned char wcwidth_widths[] = {", end="")
for i, r in enumerate(all_ranges):
if i % 24:
print(" ", end="")
else:
print("\n ", end="")
print("%d," % r[1], end="")
print("\n};")
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