sync code with last improvements from OpenBSD
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240
dist/fontconfig/fc-case/fc-case.py
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dist/fontconfig/fc-case/fc-case.py
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#!/usr/bin/env python3
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#
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# fontconfig/fc-case/fc-case.py
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#
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# Copyright © 2004 Keith Packard
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# Copyright © 2019 Tim-Philipp Müller
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#
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# Permission to use, copy, modify, distribute, and sell this software and its
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# documentation for any purpose is hereby granted without fee, provided that
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# the above copyright notice appear in all copies and that both that
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# copyright notice and this permission notice appear in supporting
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# documentation, and that the name of the author(s) not be used in
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# advertising or publicity pertaining to distribution of the software without
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# specific, written prior permission. The authors make no
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# representations about the suitability of this software for any purpose. It
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# is provided "as is" without express or implied warranty.
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#
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# THE AUTHOR(S) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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# INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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# EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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# DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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# TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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# PERFORMANCE OF THIS SOFTWARE.
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from enum import Enum
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import argparse
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import string
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import sys
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class CaseFoldClass(Enum):
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COMMON = 1
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FULL = 2
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SIMPLE = 3
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TURKIC = 4
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class CaseFoldMethod(Enum):
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RANGE = 0
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EVEN_ODD = 1
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FULL = 2
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caseFoldClassMap = {
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'C' : CaseFoldClass.COMMON,
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'F' : CaseFoldClass.FULL,
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'S' : CaseFoldClass.SIMPLE,
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'T' : CaseFoldClass.TURKIC
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}
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folds = []
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def ucs4_to_utf8(ucs4):
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utf8_rep = []
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if ucs4 < 0x80:
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utf8_rep.append(ucs4)
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bits = -6
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elif ucs4 < 0x800:
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utf8_rep.append(((ucs4 >> 6) & 0x1F) | 0xC0)
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bits = 0
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elif ucs4 < 0x10000:
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utf8_rep.append(((ucs4 >> 12) & 0x0F) | 0xE0)
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bits = 6
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elif ucs4 < 0x200000:
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utf8_rep.append(((ucs4 >> 18) & 0x07) | 0xF0)
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bits = 12
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elif ucs4 < 0x4000000:
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utf8_rep.append(((ucs4 >> 24) & 0x03) | 0xF8)
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bits = 18
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elif ucs4 < 0x80000000:
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utf8_rep.append(((ucs4 >> 30) & 0x01) | 0xFC)
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bits = 24
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else:
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return [];
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while bits >= 0:
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utf8_rep.append(((ucs4 >> bits) & 0x3F) | 0x80)
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bits-= 6
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return utf8_rep
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def utf8_size(ucs4):
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return len(ucs4_to_utf8(ucs4))
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case_fold_method_name_map = {
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CaseFoldMethod.RANGE: 'FC_CASE_FOLD_RANGE,',
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CaseFoldMethod.EVEN_ODD: 'FC_CASE_FOLD_EVEN_ODD,',
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CaseFoldMethod.FULL: 'FC_CASE_FOLD_FULL,',
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}
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if __name__=='__main__':
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parser = argparse.ArgumentParser()
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parser.add_argument('case_folding_file')
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parser.add_argument('--template', dest='template_file', default=None)
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parser.add_argument('--output', dest='output_file', default=None)
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args = parser.parse_args()
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minFoldChar = None
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maxFoldChar = None
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fold = None
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foldChars = []
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maxFoldChars = 0
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maxExpand = 0
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# Read the standard Unicode CaseFolding.txt file
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with open(args.case_folding_file, 'r', encoding='utf-8') as casefile:
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for cnt, line in enumerate(casefile):
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if not line or not line[0] in string.hexdigits:
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continue
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# print('Line {}: {}'.format(cnt, line.strip()))
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tokens = line.split('; ')
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if len(tokens) < 3:
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print('Not enough tokens in line {}'.format(cnt), file=sys.stderr)
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sys.exit(1)
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# Get upper case value
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upper = int(tokens.pop(0), 16)
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# Get class
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cfclass = caseFoldClassMap[tokens.pop(0)]
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# Get list of result characters
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lower = list(map(lambda s: int(s,16), tokens.pop(0).split()))
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# print('\t----> {:04X} {} {}'.format(upper, cfclass, lower))
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if not minFoldChar:
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minFoldChar = upper
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maxFoldChar = upper;
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if cfclass in [CaseFoldClass.COMMON, CaseFoldClass.FULL]:
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if len(lower) == 1:
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# foldExtends
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if fold and fold['method'] == CaseFoldMethod.RANGE:
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foldExtends = (lower[0] - upper) == fold['offset'] and upper == fold['upper'] + fold['count']
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elif fold and fold['method'] == CaseFoldMethod.EVEN_ODD:
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foldExtends = (lower[0] - upper) == 1 and upper == (fold['upper'] + fold['count'] + 1)
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else:
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foldExtends = False
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if foldExtends:
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# This modifies the last fold item in the array too
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fold['count'] = upper - fold['upper'] + 1;
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else:
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fold = {}
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fold['upper'] = upper
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fold['offset'] = lower[0] - upper;
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if fold['offset'] == 1:
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fold['method'] = CaseFoldMethod.EVEN_ODD
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else:
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fold['method'] = CaseFoldMethod.RANGE
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fold['count'] = 1
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folds.append(fold)
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expand = utf8_size (lower[0]) - utf8_size(upper)
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else:
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fold = {}
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fold['upper'] = upper
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fold['method'] = CaseFoldMethod.FULL
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fold['offset'] = len(foldChars)
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# add chars
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for c in lower:
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utf8_rep = ucs4_to_utf8(c)
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# print('{} -> {}'.format(c,utf8_rep))
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for utf8_char in utf8_rep:
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foldChars.append(utf8_char)
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fold['count'] = len(foldChars) - fold['offset']
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folds.append(fold)
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if fold['count'] > maxFoldChars:
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maxFoldChars = fold['count']
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expand = fold['count'] - utf8_size(upper)
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if expand > maxExpand:
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maxExpand = expand
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# Open output file
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if args.output_file:
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sys.stdout = open(args.output_file, 'w', encoding='utf-8')
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# Read the template file
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if args.template_file:
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tmpl_file = open(args.template_file, 'r', encoding='utf-8')
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else:
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tmpl_file = sys.stdin
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# Scan the input until the marker is found
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# FIXME: this is a bit silly really, might just as well harcode
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# the license header in the script and drop the template
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for line in tmpl_file:
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if line.strip() == '@@@':
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break
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print(line, end='')
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# Dump these tables
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print('#define FC_NUM_CASE_FOLD\t{}'.format(len(folds)))
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print('#define FC_NUM_CASE_FOLD_CHARS\t{}'.format(len(foldChars)))
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print('#define FC_MAX_CASE_FOLD_CHARS\t{}'.format(maxFoldChars))
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print('#define FC_MAX_CASE_FOLD_EXPAND\t{}'.format(maxExpand))
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print('#define FC_MIN_FOLD_CHAR\t0x{:08x}'.format(minFoldChar))
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print('#define FC_MAX_FOLD_CHAR\t0x{:08x}'.format(maxFoldChar))
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print('')
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# Dump out ranges
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print('static const FcCaseFold fcCaseFold[FC_NUM_CASE_FOLD] = {')
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for f in folds:
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short_offset = f['offset']
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if short_offset < -32367:
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short_offset += 65536
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if short_offset > 32368:
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short_offset -= 65536
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print(' {} 0x{:08x}, {:22s} 0x{:04x}, {:6d} {},'.format('{',
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f['upper'], case_fold_method_name_map[f['method']],
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f['count'], short_offset, '}'))
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print('};\n')
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# Dump out "other" values
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print('static const FcChar8\tfcCaseFoldChars[FC_NUM_CASE_FOLD_CHARS] = {')
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for n, c in enumerate(foldChars):
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if n == len(foldChars) - 1:
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end = ''
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elif n % 16 == 15:
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end = ',\n'
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else:
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end = ','
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print('0x{:02x}'.format(c), end=end)
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print('\n};')
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# And flush out the rest of the input file
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for line in tmpl_file:
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print(line, end='')
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sys.stdout.flush()
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