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Do not break after Myanmar viramas

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am: acaf5cc08d

* commit 'acaf5cc08defe3dfaa1e0caa945be494532cbaa0':
  Do not break after Myanmar viramas

Change-Id: I13297120c3c3789c03b860c9e72b3a04922ab9fa
This commit is contained in:
Roozbeh Pournader
2016-05-26 01:44:33 +00:00
committed by android-build-merger
parent 3a0a3c1238 acaf5cc08d
commit e04e0e9a43
2 changed files with 22 additions and 1 deletions
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10
engine/src/flutter/libs/minikin/WordBreaker.cpp
View File

@@ -76,12 +76,20 @@ static bool isBreakValid(const uint16_t* buf, size_t bufEnd, size_t i) {
if (codePoint == CHAR_SOFT_HYPHEN) {
return false;
}
// For Myanmar kinzi sequences, created by <consonant, ASAT, VIRAMA, consonant>. This is to go
// around a bug in ICU line breaking: http://bugs.icu-project.org/trac/ticket/12561. To avoid
// too much looking around in the strings, we simply avoid breaking after any Myanmar virama,
// where no line break could be imagined, since the Myanmar virama is a pure stacker.
if (codePoint == 0x1039) { // MYANMAR SIGN VIRAMA
return false;
}
uint32_t next_codepoint;
size_t next_offset = i;
U16_NEXT(buf, next_offset, bufEnd, next_codepoint);
// Proposed change to LB24 from http://www.unicode.org/L2/L2016/16043r-line-break-pr-po.txt
//(AL | HL) × (PR | PO)
// (AL | HL) × (PR | PO)
int32_t lineBreak = u_getIntPropertyValue(codePoint, UCHAR_LINE_BREAK);
if (lineBreak == U_LB_ALPHABETIC || lineBreak == U_LB_HEBREW_LETTER) {
lineBreak = u_getIntPropertyValue(next_codepoint, UCHAR_LINE_BREAK);

13
engine/src/flutter/tests/WordBreakerTests.cpp
View File

@@ -85,6 +85,19 @@ TEST_F(WordBreakerTest, postfixAndPrefix) {
EXPECT_EQ((ssize_t)NELEM(buf), breaker.wordEnd());
}
TEST_F(WordBreakerTest, MyanmarKinzi) {
uint16_t buf[] = {0x1004, 0x103A, 0x1039, 0x1000, 0x102C}; // NGA, ASAT, VIRAMA, KA, UU
WordBreaker breaker;
icu::Locale burmese("my");
breaker.setLocale(burmese);
breaker.setText(buf, NELEM(buf));
EXPECT_EQ(0, breaker.current());
EXPECT_EQ((ssize_t)NELEM(buf), breaker.next()); // end of string
EXPECT_EQ(0, breaker.wordStart());
EXPECT_EQ((ssize_t)NELEM(buf), breaker.wordEnd());
}
TEST_F(WordBreakerTest, zwjEmojiSequences) {
uint16_t buf[] = {
// man + zwj + heart + zwj + man