96 lines
3 KiB
Python
96 lines
3 KiB
Python
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#!/usr/bin/env python3
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# Generate Unicode case-folding table for Ada.
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# Copyright (C) 2022 Free Software Foundation, Inc.
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# This file is part of GDB.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This generates the ada-casefold.h header.
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# Usage:
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# python ada-unicode.py
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import gdbcopyright
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# The start of the current range of case-conversions we are
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# processing. If RANGE_START is None, then we're outside of a range.
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range_start = None
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# End of the current range.
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range_end = None
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# The delta between RANGE_START and the upper-case variant of that
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# character.
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upper_delta = None
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# The delta between RANGE_START and the lower-case variant of that
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# character.
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lower_delta = None
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# All the ranges found and completed so far.
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# Each entry is a tuple of the form (START, END, UPPER_DELTA, LOWER_DELTA).
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all_ranges = []
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def finish_range():
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global range_start
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global range_end
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global upper_delta
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global lower_delta
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if range_start is not None:
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all_ranges.append((range_start, range_end, upper_delta, lower_delta))
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range_start = None
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range_end = None
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upper_delta = None
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lower_delta = None
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def process_codepoint(val):
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global range_start
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global range_end
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global upper_delta
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global lower_delta
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c = chr(val)
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low = c.lower()
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up = c.upper()
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# U+00DF ("LATIN SMALL LETTER SHARP S", aka eszsett) traditionally
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# upper-cases to the two-character string "SS" (the capital form
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# is a relatively recent addition -- 2017). Our simple scheme
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# can't handle this, so we skip it. Also, because our approach
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# just represents runs of characters with identical folding
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# deltas, this change must terminate the current run.
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if (c == low and c == up) or len(low) != 1 or len(up) != 1:
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finish_range()
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return
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updelta = ord(up) - val
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lowdelta = ord(low) - val
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if range_start is not None and (updelta != upper_delta or lowdelta != lower_delta):
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finish_range()
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if range_start is None:
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range_start = val
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upper_delta = updelta
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lower_delta = lowdelta
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range_end = val
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for c in range(0, 0x10FFFF):
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process_codepoint(c)
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with open("ada-casefold.h", "w") as f:
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print(
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gdbcopyright.copyright("ada-unicode.py", "UTF-32 case-folding for GDB"),
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file=f,
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)
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for r in all_ranges:
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print(f" {{{r[0]}, {r[1]}, {r[2]}, {r[3]}}},", file=f)
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