Check in LLVM r95781.
diff --git a/lib/Support/StringExtras.cpp b/lib/Support/StringExtras.cpp
new file mode 100644
index 0000000..eb2fa08
--- /dev/null
+++ b/lib/Support/StringExtras.cpp
@@ -0,0 +1,81 @@
+//===-- StringExtras.cpp - Implement the StringExtras header --------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the StringExtras.h header
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
+using namespace llvm;
+
+/// StrInStrNoCase - Portable version of strcasestr. Locates the first
+/// occurrence of string 's1' in string 's2', ignoring case. Returns
+/// the offset of s2 in s1 or npos if s2 cannot be found.
+StringRef::size_type llvm::StrInStrNoCase(StringRef s1, StringRef s2) {
+ size_t N = s2.size(), M = s1.size();
+ if (N > M)
+ return StringRef::npos;
+ for (size_t i = 0, e = M - N + 1; i != e; ++i)
+ if (s1.substr(i, N).equals_lower(s2))
+ return i;
+ return StringRef::npos;
+}
+
+/// getToken - This function extracts one token from source, ignoring any
+/// leading characters that appear in the Delimiters string, and ending the
+/// token at any of the characters that appear in the Delimiters string. If
+/// there are no tokens in the source string, an empty string is returned.
+/// The function returns a pair containing the extracted token and the
+/// remaining tail string.
+std::pair<StringRef, StringRef> llvm::getToken(StringRef Source,
+ StringRef Delimiters) {
+ // Figure out where the token starts.
+ StringRef::size_type Start = Source.find_first_not_of(Delimiters);
+
+ // Find the next occurrence of the delimiter.
+ StringRef::size_type End = Source.find_first_of(Delimiters, Start);
+
+ return std::make_pair(Source.slice(Start, End), Source.substr(End));
+}
+
+/// SplitString - Split up the specified string according to the specified
+/// delimiters, appending the result fragments to the output list.
+void llvm::SplitString(StringRef Source,
+ SmallVectorImpl<StringRef> &OutFragments,
+ StringRef Delimiters) {
+ StringRef S2, S;
+ tie(S2, S) = getToken(Source, Delimiters);
+ while (!S2.empty()) {
+ OutFragments.push_back(S2);
+ tie(S2, S) = getToken(S, Delimiters);
+ }
+}
+
+void llvm::StringRef::split(SmallVectorImpl<StringRef> &A,
+ StringRef Separators, int MaxSplit,
+ bool KeepEmpty) const {
+ StringRef rest = *this;
+
+ // rest.data() is used to distinguish cases like "a," that splits into
+ // "a" + "" and "a" that splits into "a" + 0.
+ for (int splits = 0;
+ rest.data() != NULL && (MaxSplit < 0 || splits < MaxSplit);
+ ++splits) {
+ std::pair<llvm::StringRef, llvm::StringRef> p = rest.split(Separators);
+
+ if (p.first.size() != 0 || KeepEmpty)
+ A.push_back(p.first);
+ rest = p.second;
+ }
+ // If we have a tail left, add it.
+ if (rest.data() != NULL && (rest.size() != 0 || KeepEmpty))
+ A.push_back(rest);
+}