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Bug 1296050 - When checking whether bidi resolution is needed, ignore Unicode directional-control characters that do not actually introduce right-to-left-ness. r=xidorn

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This commit is contained in:
Jonathan Kew 2016-09-05 14:15:32 +01:00
parent 882bb6e2b5
commit e45cb1544d
2 changed files with 24 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
dom/base/nsTextFragment.cpp
View file

@ -461,7 +461,7 @@ nsTextFragment::UpdateBidiFlag(const char16_t* aBuffer, uint32_t aLength)
char16_t ch2 = *cp++;
utf32Char = SURROGATE_TO_UCS4(ch1, ch2);
}
if (UTF32_CHAR_IS_BIDI(utf32Char) || IsBidiControl(utf32Char)) {
if (UTF32_CHAR_IS_BIDI(utf32Char) || IsBidiControlRTL(utf32Char)) {
mState.mIsBidi = true;
break;
}

23
intl/unicharutil/util/nsBidiUtils.h
View file

@ -111,10 +111,19 @@ typedef enum nsCharType nsCharType;
* Return false, otherwise
*/
#define LRM_CHAR 0x200e
#define RLM_CHAR 0x200f
#define LRE_CHAR 0x202a
#define RLE_CHAR 0x202b
#define PDF_CHAR 0x202c
#define LRO_CHAR 0x202d
#define RLO_CHAR 0x202e
#define LRI_CHAR 0x2066
#define RLI_CHAR 0x2067
#define FSI_CHAR 0x2068
#define PDI_CHAR 0x2069
#define ALM_CHAR 0x061C
inline bool IsBidiControl(uint32_t aChar) {
return ((LRE_CHAR <= aChar && aChar <= RLO_CHAR) ||
@ -123,6 +132,20 @@ typedef enum nsCharType nsCharType;
(aChar & 0xfffffe) == LRM_CHAR);
}
/**
* Give a UTF-32 codepoint
* Return true if the codepoint is a Bidi control character that may result
* in RTL directionality and therefore needs to trigger bidi resolution;
* return false otherwise.
*/
inline bool IsBidiControlRTL(uint32_t aChar) {
return aChar == RLM_CHAR ||
aChar == RLE_CHAR ||
aChar == RLO_CHAR ||
aChar == RLI_CHAR ||
aChar == ALM_CHAR;
}
/**
* Give an nsString.
* @return true if the string contains right-to-left characters