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Add compare_lower and equals_lower methods to StringRef. Switch all users of

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StringsEqualNoCase (from StringExtras.h) to it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@87020 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2009-11-12 20:36:59 +00:00
parent cf62632d83
commit 05872ea804
5 changed files with 35 additions and 8 deletions
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20
lib/Support/StringRef.cpp
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@@ -15,6 +15,26 @@ using namespace llvm;
const size_t StringRef::npos;
#endif
static char ascii_tolower(char x) {
if (x >= 'A' && x <= 'Z')
return x - 'A' + 'a';
return x;
}
/// compare_lower - Compare strings, ignoring case.
int StringRef::compare_lower(StringRef RHS) const {
for (size_t I = 0, E = std::min(Length, RHS.Length); I != E; ++I) {
char LHC = ascii_tolower(Data[I]);
char RHC = ascii_tolower(RHS.Data[I]);
if (LHC != RHC)
return LHC < RHC ? -1 : 1;
}
if (Length == RHS.Length)
return 0;
return Length < RHS.Length ? -1 : 1;
}
//===----------------------------------------------------------------------===//
// String Searching
//===----------------------------------------------------------------------===//