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partly import changes from tenfourfox:

Browse source 
- #482: better bidi M1358275 M1392181 M1428774 + backbugs (e88a717ab)
- M1739352 M1732572(partial) M1717318(partial) M1586061 (03ffdeadb)
- M1737515 M1737470(no tests) +TLDs, tzdata (fd2b82f13)
This commit is contained in:
roytam1 2022-01-04 11:19:13 +08:00
commit 34231f343b
10 changed files with 311 additions and 278 deletions
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22
intl/unicharutil/util/nsBidiUtils.h
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@ -147,10 +147,17 @@ typedef enum nsCharType nsCharType;
}
/**
* Give an nsString.
* Give a 16-bit (UTF-16) text buffer and length
* @return true if the string contains right-to-left characters
*/
bool HasRTLChars(const nsAString& aString);
bool HasRTLChars(const char16_t* aText, uint32_t aLength);
/**
* Convenience function to call the above on an nsAString.
*/
inline bool HasRTLChars(const nsAString& aString) {
return HasRTLChars(aString.BeginReading(), aString.Length());
}
// These values are shared with Preferences dialog
// ------------------
@ -256,6 +263,17 @@ typedef enum nsCharType nsCharType;
((0xfe70 <= (c)) && ((c) <= 0xfefc)))
#define IS_IN_SMP_RTL_BLOCK(c) (((0x10800 <= (c)) && ((c) <= 0x10fff)) || \
((0x1e800 <= (c)) && ((c) <= 0x1eFFF)))
// Due to the supplementary-plane RTL blocks being identifiable from the
// high surrogate without examining the low surrogate, it is correct to
// use this by-code-unit check on potentially astral text without doing
// the math to decode surrogate pairs into code points. However, unpaired
// high surrogates that are RTL high surrogates then count as RTL even
// though, if replaced by the REPLACEMENT CHARACTER, it would not be
// RTL.
#define UTF16_CODE_UNIT_IS_BIDI(c) ((IS_IN_BMP_RTL_BLOCK(c)) || \
(IS_RTL_PRESENTATION_FORM(c)) || \
(c) == 0xD802 || (c) == 0xD803 || \
(c) == 0xD83A || (c) == 0xD83B)
#define UCS2_CHAR_IS_BIDI(c) ((IS_IN_BMP_RTL_BLOCK(c)) || \
(IS_RTL_PRESENTATION_FORM(c)) || \
(c) == 0xD802 || (c) == 0xD803)