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#!/usr/bin/env python3
# Generate Unicode case-folding table for Ada.
# Copyright (C) 2022-2023 Free Software Foundation, Inc.
# This file is part of GDB.
# 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 3 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, see <http://www.gnu.org/licenses/>.
# This generates the ada-casefold.h header.
# Usage:
# python ada-unicode.py
import gdbcopyright
# The start of the current range of case-conversions we are
# processing. If RANGE_START is None, then we're outside of a range.
range_start = None
# End of the current range.
range_end = None
# The delta between RANGE_START and the upper-case variant of that
# character.
upper_delta = None
# The delta between RANGE_START and the lower-case variant of that
# character.
lower_delta = None
# All the ranges found and completed so far.
# Each entry is a tuple of the form (START, END, UPPER_DELTA, LOWER_DELTA).
all_ranges = []
def finish_range():
global range_start
global range_end
global upper_delta
global lower_delta
if range_start is not None:
all_ranges.append((range_start, range_end, upper_delta, lower_delta))
range_start = None
range_end = None
upper_delta = None
lower_delta = None
def process_codepoint(val):
global range_start
global range_end
global upper_delta
global lower_delta
c = chr(val)
low = c.lower()
up = c.upper()
# U+00DF ("LATIN SMALL LETTER SHARP S", aka eszsett) traditionally
# upper-cases to the two-character string "SS" (the capital form
# is a relatively recent addition -- 2017). Our simple scheme
# can't handle this, so we skip it. Also, because our approach
# just represents runs of characters with identical folding
# deltas, this change must terminate the current run.
if (c == low and c == up) or len(low) != 1 or len(up) != 1:
finish_range()
return
updelta = ord(up) - val
lowdelta = ord(low) - val
if range_start is not None and (updelta != upper_delta or lowdelta != lower_delta):
finish_range()
if range_start is None:
range_start = val
upper_delta = updelta
lower_delta = lowdelta
range_end = val
for c in range(0, 0x10FFFF):
process_codepoint(c)
with open("ada-casefold.h", "w") as f:
print(
gdbcopyright.copyright("ada-unicode.py", "UTF-32 case-folding for GDB"),
file=f,
)
for r in all_ranges:
print(f" {{{r[0]}, {r[1]}, {r[2]}, {r[3]}}},", file=f)
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