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Add llvm::getOrdinalSuffix to get the appropriate -st, -nd, -rd, -th suffix.

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Used by clang to print parameter indexes.

llvm-svn: 164440
This commit is contained in:
Jordan Rose 2012-09-22 01:24:21 +00:00
parent f8bd27333f
commit 322d2a4afc
1 changed files with 19 additions and 0 deletions
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19
include/llvm/ADT/StringExtras.h
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@ -129,6 +129,25 @@ static inline unsigned HashString(StringRef Str, unsigned Result = 0) {
return Result;
}
/// Returns the English suffix for an ordinal integer (-st, -nd, -rd, -th).
static inline StringRef getOrdinalSuffix(unsigned Val) {
// It is critically important that we do this perfectly for
// user-written sequences with over 100 elements.
switch (Val % 100) {
case 11:
case 12:
case 13:
return "th";
default:
switch (Val % 10) {
case 1: return "st";
case 2: return "nd";
case 3: return "rd";
default: return "th";
}
}
}
} // End llvm namespace
#endif