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indexer: change Pos computation from byte offset to UTF-8 encoded code point offset

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This commit is contained in:
Fangrui Song 2019-02-16 17:23:47 +08:00
parent a833b0cb22
commit c00f493fcc
1 changed files with 10 additions and 0 deletions
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10
src/clang_tu.cc
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@ -33,6 +33,16 @@ static Pos Decomposed2LineAndCol(const SourceManager &SM,
std::pair<FileID, unsigned> I) {
int l = (int)SM.getLineNumber(I.first, I.second) - 1,
c = (int)SM.getColumnNumber(I.first, I.second) - 1;
bool Invalid = false;
StringRef Buf = SM.getBufferData(I.first, &Invalid);
if (!Invalid) {
StringRef P = Buf.substr(I.second - c, c);
c = 0;
for (size_t i = 0; i < P.size(); )
if (c++, (uint8_t)P[i++] >= 128)
while (i < P.size() && (uint8_t)P[i] >= 128 && (uint8_t)P[i] < 192)
i++;
}
return {(int16_t)std::min<int>(l, INT16_MAX),
(int16_t)std::min<int>(c, INT16_MAX)};
}