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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// Copied from strings/stringpiece.h with modifications
+//
+// A string-like object that points to a sized piece of memory.
+//
+// You can use StringPiece as a function or method parameter. A StringPiece
+// parameter can receive a double-quoted string literal argument, a "const
+// char*" argument, a string argument, or a StringPiece argument with no data
+// copying. Systematic use of StringPiece for arguments reduces data
+// copies and strlen() calls.
+//
+// Prefer passing StringPieces by value:
+// void MyFunction(StringPiece arg);
+// If circumstances require, you may also pass by const reference:
+// void MyFunction(const StringPiece& arg); // not preferred
+// Both of these have the same lifetime semantics. Passing by value
+// generates slightly smaller code. For more discussion, Googlers can see
+// the thread go/stringpiecebyvalue on c-users.
+
+#ifndef BASE_STRINGS_STRING_PIECE_H_
+#define BASE_STRINGS_STRING_PIECE_H_
+
+#include <stddef.h>
+
+#include <iosfwd>
+#include <string>
+#include <type_traits>
+
+#include "base/base_export.h"
+#include "base/logging.h"
+#include "base/strings/char_traits.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_piece_forward.h"
+
+namespace base {
+
+// internal --------------------------------------------------------------------
+
+// Many of the StringPiece functions use different implementations for the
+// 8-bit and 16-bit versions, and we don't want lots of template expansions in
+// this (very common) header that will slow down compilation.
+//
+// So here we define overloaded functions called by the StringPiece template.
+// For those that share an implementation, the two versions will expand to a
+// template internal to the .cc file.
+namespace internal {
+
+BASE_EXPORT void AppendToString(const StringPiece& self, std::string* target);
+BASE_EXPORT void AppendToString(const StringPiece16& self, string16* target);
+
+BASE_EXPORT size_t copy(const StringPiece& self,
+ char* buf,
+ size_t n,
+ size_t pos);
+BASE_EXPORT size_t copy(const StringPiece16& self,
+ char16* buf,
+ size_t n,
+ size_t pos);
+
+BASE_EXPORT size_t find(const StringPiece& self,
+ const StringPiece& s,
+ size_t pos);
+BASE_EXPORT size_t find(const StringPiece16& self,
+ const StringPiece16& s,
+ size_t pos);
+BASE_EXPORT size_t find(const StringPiece& self,
+ char c,
+ size_t pos);
+BASE_EXPORT size_t find(const StringPiece16& self,
+ char16 c,
+ size_t pos);
+
+BASE_EXPORT size_t rfind(const StringPiece& self,
+ const StringPiece& s,
+ size_t pos);
+BASE_EXPORT size_t rfind(const StringPiece16& self,
+ const StringPiece16& s,
+ size_t pos);
+BASE_EXPORT size_t rfind(const StringPiece& self,
+ char c,
+ size_t pos);
+BASE_EXPORT size_t rfind(const StringPiece16& self,
+ char16 c,
+ size_t pos);
+
+BASE_EXPORT size_t find_first_of(const StringPiece& self,
+ const StringPiece& s,
+ size_t pos);
+BASE_EXPORT size_t find_first_of(const StringPiece16& self,
+ const StringPiece16& s,
+ size_t pos);
+
+BASE_EXPORT size_t find_first_not_of(const StringPiece& self,
+ const StringPiece& s,
+ size_t pos);
+BASE_EXPORT size_t find_first_not_of(const StringPiece16& self,
+ const StringPiece16& s,
+ size_t pos);
+BASE_EXPORT size_t find_first_not_of(const StringPiece& self,
+ char c,
+ size_t pos);
+BASE_EXPORT size_t find_first_not_of(const StringPiece16& self,
+ char16 c,
+ size_t pos);
+
+BASE_EXPORT size_t find_last_of(const StringPiece& self,
+ const StringPiece& s,
+ size_t pos);
+BASE_EXPORT size_t find_last_of(const StringPiece16& self,
+ const StringPiece16& s,
+ size_t pos);
+BASE_EXPORT size_t find_last_of(const StringPiece& self,
+ char c,
+ size_t pos);
+BASE_EXPORT size_t find_last_of(const StringPiece16& self,
+ char16 c,
+ size_t pos);
+
+BASE_EXPORT size_t find_last_not_of(const StringPiece& self,
+ const StringPiece& s,
+ size_t pos);
+BASE_EXPORT size_t find_last_not_of(const StringPiece16& self,
+ const StringPiece16& s,
+ size_t pos);
+BASE_EXPORT size_t find_last_not_of(const StringPiece16& self,
+ char16 c,
+ size_t pos);
+BASE_EXPORT size_t find_last_not_of(const StringPiece& self,
+ char c,
+ size_t pos);
+
+BASE_EXPORT StringPiece substr(const StringPiece& self,
+ size_t pos,
+ size_t n);
+BASE_EXPORT StringPiece16 substr(const StringPiece16& self,
+ size_t pos,
+ size_t n);
+
+} // namespace internal
+
+// BasicStringPiece ------------------------------------------------------------
+
+// Defines the types, methods, operators, and data members common to both
+// StringPiece and StringPiece16.
+//
+// This is templatized by string class type rather than character type, so
+// BasicStringPiece<std::string> or BasicStringPiece<base::string16>.
+template <typename STRING_TYPE> class BasicStringPiece {
+ public:
+ // Standard STL container boilerplate.
+ typedef size_t size_type;
+ typedef typename STRING_TYPE::value_type value_type;
+ typedef const value_type* pointer;
+ typedef const value_type& reference;
+ typedef const value_type& const_reference;
+ typedef ptrdiff_t difference_type;
+ typedef const value_type* const_iterator;
+ typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
+
+ static const size_type npos;
+
+ public:
+ // We provide non-explicit singleton constructors so users can pass
+ // in a "const char*" or a "string" wherever a "StringPiece" is
+ // expected (likewise for char16, string16, StringPiece16).
+ constexpr BasicStringPiece() : ptr_(NULL), length_(0) {}
+ // TODO(dcheng): Construction from nullptr is not allowed for
+ // std::basic_string_view, so remove the special handling for it.
+ // Note: This doesn't just use STRING_TYPE::traits_type::length(), since that
+ // isn't constexpr until C++17.
+ constexpr BasicStringPiece(const value_type* str)
+ : ptr_(str), length_(!str ? 0 : CharTraits<value_type>::length(str)) {}
+ BasicStringPiece(const STRING_TYPE& str)
+ : ptr_(str.data()), length_(str.size()) {}
+ constexpr BasicStringPiece(const value_type* offset, size_type len)
+ : ptr_(offset), length_(len) {}
+ BasicStringPiece(const typename STRING_TYPE::const_iterator& begin,
+ const typename STRING_TYPE::const_iterator& end) {
+ DCHECK(begin <= end) << "StringPiece iterators swapped or invalid.";
+ length_ = static_cast<size_t>(std::distance(begin, end));
+
+ // The length test before assignment is to avoid dereferencing an iterator
+ // that may point to the end() of a string.
+ ptr_ = length_ > 0 ? &*begin : nullptr;
+ }
+
+ // data() may return a pointer to a buffer with embedded NULs, and the
+ // returned buffer may or may not be null terminated. Therefore it is
+ // typically a mistake to pass data() to a routine that expects a NUL
+ // terminated string.
+ constexpr const value_type* data() const { return ptr_; }
+ constexpr size_type size() const noexcept { return length_; }
+ constexpr size_type length() const noexcept { return length_; }
+ bool empty() const { return length_ == 0; }
+
+ constexpr value_type operator[](size_type i) const {
+ CHECK(i < length_);
+ return ptr_[i];
+ }
+
+ value_type front() const {
+ CHECK_NE(0UL, length_);
+ return ptr_[0];
+ }
+
+ value_type back() const {
+ CHECK_NE(0UL, length_);
+ return ptr_[length_ - 1];
+ }
+
+ constexpr void remove_prefix(size_type n) {
+ CHECK(n <= length_);
+ ptr_ += n;
+ length_ -= n;
+ }
+
+ constexpr void remove_suffix(size_type n) {
+ CHECK(n <= length_);
+ length_ -= n;
+ }
+
+ constexpr int compare(BasicStringPiece x) const noexcept {
+ int r = CharTraits<value_type>::compare(
+ ptr_, x.ptr_, (length_ < x.length_ ? length_ : x.length_));
+ if (r == 0) {
+ if (length_ < x.length_) r = -1;
+ else if (length_ > x.length_) r = +1;
+ }
+ return r;
+ }
+
+ // This is the style of conversion preferred by std::string_view in C++17.
+ explicit operator STRING_TYPE() const { return as_string(); }
+
+ STRING_TYPE as_string() const {
+ // std::string doesn't like to take a NULL pointer even with a 0 size.
+ return empty() ? STRING_TYPE() : STRING_TYPE(data(), size());
+ }
+
+ const_iterator begin() const { return ptr_; }
+ const_iterator end() const { return ptr_ + length_; }
+ const_reverse_iterator rbegin() const {
+ return const_reverse_iterator(ptr_ + length_);
+ }
+ const_reverse_iterator rend() const {
+ return const_reverse_iterator(ptr_);
+ }
+
+ size_type max_size() const { return length_; }
+ size_type capacity() const { return length_; }
+
+ void AppendToString(STRING_TYPE* target) const {
+ internal::AppendToString(*this, target);
+ }
+
+ size_type copy(value_type* buf, size_type n, size_type pos = 0) const {
+ return internal::copy(*this, buf, n, pos);
+ }
+
+ // Does "this" start with "x"
+ constexpr bool starts_with(BasicStringPiece x) const noexcept {
+ return (
+ (this->length_ >= x.length_) &&
+ (CharTraits<value_type>::compare(this->ptr_, x.ptr_, x.length_) == 0));
+ }
+
+ // Does "this" end with "x"
+ constexpr bool ends_with(BasicStringPiece x) const noexcept {
+ return ((this->length_ >= x.length_) &&
+ (CharTraits<value_type>::compare(
+ this->ptr_ + (this->length_ - x.length_), x.ptr_, x.length_) ==
+ 0));
+ }
+
+ // find: Search for a character or substring at a given offset.
+ size_type find(const BasicStringPiece<STRING_TYPE>& s,
+ size_type pos = 0) const {
+ return internal::find(*this, s, pos);
+ }
+ size_type find(value_type c, size_type pos = 0) const {
+ return internal::find(*this, c, pos);
+ }
+
+ // rfind: Reverse find.
+ size_type rfind(const BasicStringPiece& s,
+ size_type pos = BasicStringPiece::npos) const {
+ return internal::rfind(*this, s, pos);
+ }
+ size_type rfind(value_type c, size_type pos = BasicStringPiece::npos) const {
+ return internal::rfind(*this, c, pos);
+ }
+
+ // find_first_of: Find the first occurence of one of a set of characters.
+ size_type find_first_of(const BasicStringPiece& s,
+ size_type pos = 0) const {
+ return internal::find_first_of(*this, s, pos);
+ }
+ size_type find_first_of(value_type c, size_type pos = 0) const {
+ return find(c, pos);
+ }
+
+ // find_first_not_of: Find the first occurence not of a set of characters.
+ size_type find_first_not_of(const BasicStringPiece& s,
+ size_type pos = 0) const {
+ return internal::find_first_not_of(*this, s, pos);
+ }
+ size_type find_first_not_of(value_type c, size_type pos = 0) const {
+ return internal::find_first_not_of(*this, c, pos);
+ }
+
+ // find_last_of: Find the last occurence of one of a set of characters.
+ size_type find_last_of(const BasicStringPiece& s,
+ size_type pos = BasicStringPiece::npos) const {
+ return internal::find_last_of(*this, s, pos);
+ }
+ size_type find_last_of(value_type c,
+ size_type pos = BasicStringPiece::npos) const {
+ return rfind(c, pos);
+ }
+
+ // find_last_not_of: Find the last occurence not of a set of characters.
+ size_type find_last_not_of(const BasicStringPiece& s,
+ size_type pos = BasicStringPiece::npos) const {
+ return internal::find_last_not_of(*this, s, pos);
+ }
+ size_type find_last_not_of(value_type c,
+ size_type pos = BasicStringPiece::npos) const {
+ return internal::find_last_not_of(*this, c, pos);
+ }
+
+ // substr.
+ BasicStringPiece substr(size_type pos,
+ size_type n = BasicStringPiece::npos) const {
+ return internal::substr(*this, pos, n);
+ }
+
+ protected:
+ const value_type* ptr_;
+ size_type length_;
+};
+
+template <typename STRING_TYPE>
+const typename BasicStringPiece<STRING_TYPE>::size_type
+BasicStringPiece<STRING_TYPE>::npos =
+ typename BasicStringPiece<STRING_TYPE>::size_type(-1);
+
+// MSVC doesn't like complex extern templates and DLLs.
+#if !defined(COMPILER_MSVC)
+extern template class BASE_EXPORT BasicStringPiece<std::string>;
+extern template class BASE_EXPORT BasicStringPiece<string16>;
+#endif
+
+// Comparison operators --------------------------------------------------------
+// operator ==
+template <typename StringT>
+constexpr bool operator==(BasicStringPiece<StringT> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return lhs.size() == rhs.size() && lhs.compare(rhs) == 0;
+}
+
+// Here and below we make use of std::common_type_t to emulate an identity type
+// transformation. This creates a non-deduced context, so that we can compare
+// StringPieces with types that implicitly convert to StringPieces. See
+// https://wg21.link/n3766 for details.
+// Furthermore, we require dummy template parameters for these overloads to work
+// around a name mangling issue on Windows.
+template <typename StringT, int = 1>
+constexpr bool operator==(
+ BasicStringPiece<StringT> lhs,
+ std::common_type_t<BasicStringPiece<StringT>> rhs) noexcept {
+ return lhs.size() == rhs.size() && lhs.compare(rhs) == 0;
+}
+
+template <typename StringT, int = 2>
+constexpr bool operator==(std::common_type_t<BasicStringPiece<StringT>> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return lhs.size() == rhs.size() && lhs.compare(rhs) == 0;
+}
+
+// operator !=
+template <typename StringT>
+constexpr bool operator!=(BasicStringPiece<StringT> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return !(lhs == rhs);
+}
+
+template <typename StringT, int = 1>
+constexpr bool operator!=(
+ BasicStringPiece<StringT> lhs,
+ std::common_type_t<BasicStringPiece<StringT>> rhs) noexcept {
+ return !(lhs == rhs);
+}
+
+template <typename StringT, int = 2>
+constexpr bool operator!=(std::common_type_t<BasicStringPiece<StringT>> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return !(lhs == rhs);
+}
+
+// operator <
+template <typename StringT>
+constexpr bool operator<(BasicStringPiece<StringT> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return lhs.compare(rhs) < 0;
+}
+
+template <typename StringT, int = 1>
+constexpr bool operator<(
+ BasicStringPiece<StringT> lhs,
+ std::common_type_t<BasicStringPiece<StringT>> rhs) noexcept {
+ return lhs.compare(rhs) < 0;
+}
+
+template <typename StringT, int = 2>
+constexpr bool operator<(std::common_type_t<BasicStringPiece<StringT>> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return lhs.compare(rhs) < 0;
+}
+
+// operator >
+template <typename StringT>
+constexpr bool operator>(BasicStringPiece<StringT> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return rhs < lhs;
+}
+
+template <typename StringT, int = 1>
+constexpr bool operator>(
+ BasicStringPiece<StringT> lhs,
+ std::common_type_t<BasicStringPiece<StringT>> rhs) noexcept {
+ return rhs < lhs;
+}
+
+template <typename StringT, int = 2>
+constexpr bool operator>(std::common_type_t<BasicStringPiece<StringT>> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return rhs < lhs;
+}
+
+// operator <=
+template <typename StringT>
+constexpr bool operator<=(BasicStringPiece<StringT> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return !(rhs < lhs);
+}
+
+template <typename StringT, int = 1>
+constexpr bool operator<=(
+ BasicStringPiece<StringT> lhs,
+ std::common_type_t<BasicStringPiece<StringT>> rhs) noexcept {
+ return !(rhs < lhs);
+}
+
+template <typename StringT, int = 2>
+constexpr bool operator<=(std::common_type_t<BasicStringPiece<StringT>> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return !(rhs < lhs);
+}
+
+// operator >=
+template <typename StringT>
+constexpr bool operator>=(BasicStringPiece<StringT> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return !(lhs < rhs);
+}
+
+template <typename StringT, int = 1>
+constexpr bool operator>=(
+ BasicStringPiece<StringT> lhs,
+ std::common_type_t<BasicStringPiece<StringT>> rhs) noexcept {
+ return !(lhs < rhs);
+}
+
+template <typename StringT, int = 2>
+constexpr bool operator>=(std::common_type_t<BasicStringPiece<StringT>> lhs,
+ BasicStringPiece<StringT> rhs) noexcept {
+ return !(lhs < rhs);
+}
+
+BASE_EXPORT std::ostream& operator<<(std::ostream& o,
+ const StringPiece& piece);
+
+BASE_EXPORT std::ostream& operator<<(std::ostream& o,
+ const StringPiece16& piece);
+
+// Hashing ---------------------------------------------------------------------
+
+// We provide appropriate hash functions so StringPiece and StringPiece16 can
+// be used as keys in hash sets and maps.
+
+// This hash function is copied from base/strings/string16.h. We don't use the
+// ones already defined for string and string16 directly because it would
+// require the string constructors to be called, which we don't want.
+
+template <typename StringPieceType>
+struct StringPieceHashImpl {
+ std::size_t operator()(StringPieceType sp) const {
+ std::size_t result = 0;
+ for (auto c : sp)
+ result = (result * 131) + c;
+ return result;
+ }
+};
+
+using StringPieceHash = StringPieceHashImpl<StringPiece>;
+using StringPiece16Hash = StringPieceHashImpl<StringPiece16>;
+using WStringPieceHash = StringPieceHashImpl<WStringPiece>;
+
+} // namespace base
+
+#endif // BASE_STRINGS_STRING_PIECE_H_
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