106 lines
3.2 KiB
Python
Executable file
106 lines
3.2 KiB
Python
Executable file
#!/usr/bin/env python3
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#
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# Script to generate tables for cpp_wcwidth, leveraging glibc's utf8_gen.py.
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#
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# This file is part of GCC.
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#
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# GCC is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free
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# Software Foundation; either version 3, or (at your option) any later
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# version.
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#
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# GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GCC; see the file COPYING3. If not see
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# <http://www.gnu.org/licenses/>. */
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import sys
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import os
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if len(sys.argv) != 2:
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print("usage: %s <unicode version>", file=sys.stderr)
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sys.exit(1)
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unicode_version = sys.argv[1]
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# Parse a codepoint in the format output by glibc tools.
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def parse_ucn(s):
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if not (s.startswith("<U") and s.endswith(">")):
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raise ValueError
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return int(s[2:-1], base=16)
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# Process a line of width output from utf_gen.py and update global array.
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widths = [1] * (1 + 0x10FFFF)
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def process_width(line):
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# Example lines:
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# <UA8FF> 0
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# <UA926>...<UA92D> 0
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s = line.split()
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width = int(s[1])
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r = s[0].split("...")
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if len(r) == 1:
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begin = parse_ucn(r[0])
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end = begin + 1
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elif len(r) == 2:
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begin = parse_ucn(r[0])
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end = parse_ucn(r[1]) + 1
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else:
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raise ValueError
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widths[begin:end] = [width] * (end - begin)
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# To keep things simple, we use glibc utf8_gen.py as-is. It only outputs to a
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# file named UTF-8, which is not configurable. Then we parse this into the form
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# we want it.
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os.system("from_glibc/utf8_gen.py --unicode_version %s" % unicode_version)
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processing = False
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for line in open("UTF-8", "r"):
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if processing:
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if line == "END WIDTH\n":
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processing = False
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else:
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try:
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process_width(line)
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except (ValueError, IndexError):
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print(e, "warning: ignored unexpected line: %s" % line,
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file=sys.stderr, end="")
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elif line == "WIDTH\n":
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processing = True
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# All bytes < 256 we treat as width 1.
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widths[0:255] = [1] * 255
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# Condense the list to contiguous ranges.
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cur_range = [-1, 1]
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all_ranges = []
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for i, width in enumerate(widths):
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if width == cur_range[1]:
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cur_range[0] = i
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else:
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all_ranges.append(cur_range)
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cur_range = [i, width]
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# Output the arrays for generated_cpp_wcwidth.h
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print("/* Generated by contrib/unicode/gen_wcwidth.py,",
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"with the help of glibc's")
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print(" utf8_gen.py, using version %s" % unicode_version,
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"of the Unicode standard. */")
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print("\nstatic const cppchar_t wcwidth_range_ends[] = {", end="")
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for i, r in enumerate(all_ranges):
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if i % 8:
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print(" ", end="")
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else:
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print("\n ", end="")
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print("0x%x," % (r[0]), end="")
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print("\n};\n")
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print("static const unsigned char wcwidth_widths[] = {", end="")
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for i, r in enumerate(all_ranges):
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if i % 24:
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print(" ", end="")
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else:
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print("\n ", end="")
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print("%d," % r[1], end="")
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print("\n};")
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