+ if (Data[I] != RHS.Data[I])
+ return (unsigned char)Data[I] < (unsigned char)RHS.Data[I] ? -1 : 1;
+ }
+ if (Length == RHS.Length)
+ return 0;
+ return Length < RHS.Length ? -1 : 1;
+}
+
+// Compute the edit distance between the two given strings.
+unsigned StringRef::edit_distance(llvm::StringRef Other,
+ bool AllowReplacements,
+ unsigned MaxEditDistance) const {
+ return llvm::ComputeEditDistance(
+ llvm::ArrayRef<char>(data(), size()),
+ llvm::ArrayRef<char>(Other.data(), Other.size()),
+ AllowReplacements, MaxEditDistance);
+}
+
+//===----------------------------------------------------------------------===//
+// String Operations
+//===----------------------------------------------------------------------===//
+
+std::string StringRef::lower() const {
+ std::string Result(size(), char());
+ for (size_type i = 0, e = size(); i != e; ++i) {
+ Result[i] = ascii_tolower(Data[i]);
+ }
+ return Result;
+}
+
+std::string StringRef::upper() const {
+ std::string Result(size(), char());
+ for (size_type i = 0, e = size(); i != e; ++i) {
+ Result[i] = ascii_toupper(Data[i]);
+ }
+ return Result;
+}
+
+//===----------------------------------------------------------------------===//
+// String Searching
+//===----------------------------------------------------------------------===//
+
+
+/// find - Search for the first string \arg Str in the string.
+///
+/// \return - The index of the first occurrence of \arg Str, or npos if not
+/// found.
+size_t StringRef::find(StringRef Str, size_t From) const {
+ size_t N = Str.size();
+ if (N > Length)
+ return npos;
+
+ // For short haystacks or unsupported needles fall back to the naive algorithm
+ if (Length < 16 || N > 255 || N == 0) {
+ for (size_t e = Length - N + 1, i = min(From, e); i != e; ++i)
+ if (substr(i, N).equals(Str))
+ return i;
+ return npos;
+ }
+
+ if (From >= Length)
+ return npos;
+
+ // Build the bad char heuristic table, with uint8_t to reduce cache thrashing.
+ uint8_t BadCharSkip[256];
+ std::memset(BadCharSkip, N, 256);
+ for (unsigned i = 0; i != N-1; ++i)
+ BadCharSkip[(uint8_t)Str[i]] = N-1-i;
+
+ unsigned Len = Length-From, Pos = From;
+ while (Len >= N) {
+ if (substr(Pos, N).equals(Str)) // See if this is the correct substring.
+ return Pos;
+
+ // Otherwise skip the appropriate number of bytes.
+ uint8_t Skip = BadCharSkip[(uint8_t)(*this)[Pos+N-1]];
+ Len -= Skip;
+ Pos += Skip;
+ }
+
+ return npos;
+}
+
+/// rfind - Search for the last string \arg Str in the string.
+///
+/// \return - The index of the last occurrence of \arg Str, or npos if not
+/// found.
+size_t StringRef::rfind(StringRef Str) const {
+ size_t N = Str.size();
+ if (N > Length)
+ return npos;
+ for (size_t i = Length - N + 1, e = 0; i != e;) {
+ --i;
+ if (substr(i, N).equals(Str))
+ return i;
+ }
+ return npos;
+}
+
+/// find_first_of - Find the first character in the string that is in \arg
+/// Chars, or npos if not found.
+///
+/// Note: O(size() + Chars.size())
+StringRef::size_type StringRef::find_first_of(StringRef Chars,
+ size_t From) const {
+ std::bitset<1 << CHAR_BIT> CharBits;
+ for (size_type i = 0; i != Chars.size(); ++i)
+ CharBits.set((unsigned char)Chars[i]);
+
+ for (size_type i = min(From, Length), e = Length; i != e; ++i)
+ if (CharBits.test((unsigned char)Data[i]))
+ return i;
+ return npos;
+}
+
+/// find_first_not_of - Find the first character in the string that is not
+/// \arg C or npos if not found.
+StringRef::size_type StringRef::find_first_not_of(char C, size_t From) const {
+ for (size_type i = min(From, Length), e = Length; i != e; ++i)
+ if (Data[i] != C)
+ return i;
+ return npos;
+}
+
+/// find_first_not_of - Find the first character in the string that is not
+/// in the string \arg Chars, or npos if not found.
+///
+/// Note: O(size() + Chars.size())
+StringRef::size_type StringRef::find_first_not_of(StringRef Chars,
+ size_t From) const {
+ std::bitset<1 << CHAR_BIT> CharBits;
+ for (size_type i = 0; i != Chars.size(); ++i)
+ CharBits.set((unsigned char)Chars[i]);
+
+ for (size_type i = min(From, Length), e = Length; i != e; ++i)
+ if (!CharBits.test((unsigned char)Data[i]))
+ return i;
+ return npos;
+}
+
+/// find_last_of - Find the last character in the string that is in \arg C,
+/// or npos if not found.
+///
+/// Note: O(size() + Chars.size())
+StringRef::size_type StringRef::find_last_of(StringRef Chars,
+ size_t From) const {
+ std::bitset<1 << CHAR_BIT> CharBits;
+ for (size_type i = 0; i != Chars.size(); ++i)
+ CharBits.set((unsigned char)Chars[i]);
+
+ for (size_type i = min(From, Length) - 1, e = -1; i != e; --i)
+ if (CharBits.test((unsigned char)Data[i]))
+ return i;
+ return npos;
+}
+
+/// find_last_not_of - Find the last character in the string that is not
+/// \arg C, or npos if not found.
+StringRef::size_type StringRef::find_last_not_of(char C, size_t From) const {
+ for (size_type i = min(From, Length) - 1, e = -1; i != e; --i)
+ if (Data[i] != C)
+ return i;
+ return npos;
+}
+
+/// find_last_not_of - Find the last character in the string that is not in
+/// \arg Chars, or npos if not found.
+///
+/// Note: O(size() + Chars.size())
+StringRef::size_type StringRef::find_last_not_of(StringRef Chars,
+ size_t From) const {
+ std::bitset<1 << CHAR_BIT> CharBits;
+ for (size_type i = 0, e = Chars.size(); i != e; ++i)
+ CharBits.set((unsigned char)Chars[i]);
+
+ for (size_type i = min(From, Length) - 1, e = -1; i != e; --i)
+ if (!CharBits.test((unsigned char)Data[i]))
+ return i;
+ return npos;
+}
+
+void 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() != nullptr && (MaxSplit < 0 || splits < MaxSplit);
+ ++splits) {
+ std::pair<StringRef, StringRef> p = rest.split(Separators);
+
+ if (KeepEmpty || p.first.size() != 0)
+ A.push_back(p.first);
+ rest = p.second;
+ }
+ // If we have a tail left, add it.
+ if (rest.data() != nullptr && (rest.size() != 0 || KeepEmpty))
+ A.push_back(rest);
+}
+
+//===----------------------------------------------------------------------===//
+// Helpful Algorithms
+//===----------------------------------------------------------------------===//
+
+/// count - Return the number of non-overlapped occurrences of \arg Str in
+/// the string.
+size_t StringRef::count(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;
+}
+
+static unsigned GetAutoSenseRadix(StringRef &Str) {
+ if (Str.startswith("0x")) {
+ Str = Str.substr(2);
+ return 16;