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fix: Enhance Latin letter case conversion and improve isLatinLetter function

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This commit is contained in:
Arthur Tazhitdinov 2026-01-13 23:51:17 +05:00
parent 4097319286
commit 43ebe9c66e
1 changed files with 35 additions and 3 deletions
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38
lib/Epub/Epub/hyphenation/HyphenationCommon.cpp
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@ -4,12 +4,25 @@
namespace { namespace {
// Convert Latin uppercase letters (A-Z) to lowercase (a-z) // Convert Latin uppercase letters (ASCII plus Latin-1 supplement) to lowercase
uint32_t toLowerLatinImpl(const uint32_t cp) { uint32_t toLowerLatinImpl(const uint32_t cp) {
if (cp >= 'A' && cp <= 'Z') { if (cp >= 'A' && cp <= 'Z') {
return cp - 'A' + 'a'; return cp - 'A' + 'a';
} }
return cp; if ((cp >= 0x00C0 && cp <= 0x00D6) || (cp >= 0x00D8 && cp <= 0x00DE)) {
return cp + 0x20;
}
switch (cp) {
case 0x0152: // Œ
return 0x0153; // œ
case 0x0178: // Ÿ
return 0x00FF; // ÿ
case 0x1E9E: // ẞ
return 0x00DF; // ß
default:
return cp;
}
} }
// Convert Cyrillic uppercase letters to lowercase // Convert Cyrillic uppercase letters to lowercase
@ -31,7 +44,26 @@ uint32_t toLowerLatin(const uint32_t cp) { return toLowerLatinImpl(cp); }
uint32_t toLowerCyrillic(const uint32_t cp) { return toLowerCyrillicImpl(cp); } uint32_t toLowerCyrillic(const uint32_t cp) { return toLowerCyrillicImpl(cp); }
bool isLatinLetter(const uint32_t cp) { return (cp >= 'A' && cp <= 'Z') || (cp >= 'a' && cp <= 'z'); } bool isLatinLetter(const uint32_t cp) {
if ((cp >= 'A' && cp <= 'Z') || (cp >= 'a' && cp <= 'z')) {
return true;
}
if (((cp >= 0x00C0 && cp <= 0x00D6) || (cp >= 0x00D8 && cp <= 0x00F6) || (cp >= 0x00F8 && cp <= 0x00FF)) &&
cp != 0x00D7 && cp != 0x00F7) {
return true;
}
switch (cp) {
case 0x0152: // Œ
case 0x0153: // œ
case 0x0178: // Ÿ
case 0x1E9E: // ẞ
return true;
default:
return false;
}
}
bool isCyrillicLetter(const uint32_t cp) { return (cp >= 0x0400 && cp <= 0x052F); } bool isCyrillicLetter(const uint32_t cp) { return (cp >= 0x0400 && cp <= 0x052F); }