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Add StringRef::count({char,StringRef})

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79354 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2009-08-18 18:26:35 +00:00
parent f8bc801c6c
commit 5caba3bcb1
2 changed files with 29 additions and 0 deletions
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22
include/llvm/ADT/StringRef.h
View File

@ -172,6 +172,28 @@ namespace llvm {
return npos;
}
/// count - Return the number of occurrences of \arg C in the string.
size_t count(char C) const {
size_t Count = 0;
for (size_t i = 0, e = Length; i != e; ++i)
if (Data[i] == C)
return i;
return Count;
}
/// count - Return the number of non-overlapped occurrences of \arg Str in
/// the string.
size_t count(const StringRef &Str) const {
size_t Count = 0;
size_t N = Str.size();
if (N > Length)
return 0;
for (size_t i = 0, e = Length - N + 1; i != e; ++i)
if (substr(i, N).equals(Str))
++Count;
return Count;
}
/// @}
/// @name Substring Operations
/// @{

7
unittests/ADT/StringRefTest.cpp
View File

@ -94,6 +94,13 @@ TEST(StringRefTest, Utilities) {
EXPECT_TRUE(Str.find("hello") == 0);
EXPECT_TRUE(Str.find("ello") == 1);
EXPECT_TRUE(Str.find("zz") == StringRef::npos);
EXPECT_TRUE(Str.count('l') == 2);
EXPECT_TRUE(Str.count('z') == 0);
EXPECT_TRUE(Str.count("helloworld") == 0);
EXPECT_TRUE(Str.count("hello") == 1);
EXPECT_TRUE(Str.count("ello") == 1);
EXPECT_TRUE(Str.count("zz") == 0);
}
} // end anonymous namespace