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Diffstat (limited to 'third_party/protobuf/src/google/protobuf/stubs/stringpiece.h')
| -rw-r--r-- | third_party/protobuf/src/google/protobuf/stubs/stringpiece.h | 453 |
1 files changed, 0 insertions, 453 deletions
diff --git a/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h b/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h deleted file mode 100644 index ec3ffd5b06..0000000000 --- a/third_party/protobuf/src/google/protobuf/stubs/stringpiece.h +++ /dev/null @@ -1,453 +0,0 @@ -// Protocol Buffers - Google's data interchange format -// Copyright 2008 Google Inc. All rights reserved. -// https://developers.google.com/protocol-buffers/ -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following disclaimer -// in the documentation and/or other materials provided with the -// distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -// A StringPiece points to part or all of a string, Cord, double-quoted string -// literal, or other string-like object. A StringPiece does *not* own the -// string to which it points. A StringPiece is not null-terminated. -// -// 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, see the thread -// go/stringpiecebyvalue on c-users. -// -// StringPiece is also suitable for local variables if you know that -// the lifetime of the underlying object is longer than the lifetime -// of your StringPiece variable. -// -// Beware of binding a StringPiece to a temporary: -// StringPiece sp = obj.MethodReturningString(); // BAD: lifetime problem -// -// This code is okay: -// string str = obj.MethodReturningString(); // str owns its contents -// StringPiece sp(str); // GOOD, because str outlives sp -// -// StringPiece is sometimes a poor choice for a return value and usually a poor -// choice for a data member. If you do use a StringPiece this way, it is your -// responsibility to ensure that the object pointed to by the StringPiece -// outlives the StringPiece. -// -// A StringPiece may represent just part of a string; thus the name "Piece". -// For example, when splitting a string, vector<StringPiece> is a natural data -// type for the output. For another example, a Cord is a non-contiguous, -// potentially very long string-like object. The Cord class has an interface -// that iteratively provides StringPiece objects that point to the -// successive pieces of a Cord object. -// -// A StringPiece is not null-terminated. If you write code that scans a -// StringPiece, you must check its length before reading any characters. -// Common idioms that work on null-terminated strings do not work on -// StringPiece objects. -// -// There are several ways to create a null StringPiece: -// StringPiece() -// StringPiece(NULL) -// StringPiece(NULL, 0) -// For all of the above, sp.data() == NULL, sp.length() == 0, -// and sp.empty() == true. Also, if you create a StringPiece with -// a non-NULL pointer then sp.data() != NULL. Once created, -// sp.data() will stay either NULL or not-NULL, except if you call -// sp.clear() or sp.set(). -// -// Thus, you can use StringPiece(NULL) to signal an out-of-band value -// that is different from other StringPiece values. This is similar -// to the way that const char* p1 = NULL; is different from -// const char* p2 = "";. -// -// There are many ways to create an empty StringPiece: -// StringPiece() -// StringPiece(NULL) -// StringPiece(NULL, 0) -// StringPiece("") -// StringPiece("", 0) -// StringPiece("abcdef", 0) -// StringPiece("abcdef"+6, 0) -// For all of the above, sp.length() will be 0 and sp.empty() will be true. -// For some empty StringPiece values, sp.data() will be NULL. -// For some empty StringPiece values, sp.data() will not be NULL. -// -// Be careful not to confuse: null StringPiece and empty StringPiece. -// The set of empty StringPieces properly includes the set of null StringPieces. -// That is, every null StringPiece is an empty StringPiece, -// but some non-null StringPieces are empty Stringpieces too. -// -// All empty StringPiece values compare equal to each other. -// Even a null StringPieces compares equal to a non-null empty StringPiece: -// StringPiece() == StringPiece("", 0) -// StringPiece(NULL) == StringPiece("abc", 0) -// StringPiece(NULL, 0) == StringPiece("abcdef"+6, 0) -// -// Look carefully at this example: -// StringPiece("") == NULL -// True or false? TRUE, because StringPiece::operator== converts -// the right-hand side from NULL to StringPiece(NULL), -// and then compares two zero-length spans of characters. -// However, we are working to make this example produce a compile error. -// -// Suppose you want to write: -// bool TestWhat?(StringPiece sp) { return sp == NULL; } // BAD -// Do not do that. Write one of these instead: -// bool TestNull(StringPiece sp) { return sp.data() == NULL; } -// bool TestEmpty(StringPiece sp) { return sp.empty(); } -// The intent of TestWhat? is unclear. Did you mean TestNull or TestEmpty? -// Right now, TestWhat? behaves likes TestEmpty. -// We are working to make TestWhat? produce a compile error. -// TestNull is good to test for an out-of-band signal. -// TestEmpty is good to test for an empty StringPiece. -// -// Caveats (again): -// (1) The lifetime of the pointed-to string (or piece of a string) -// must be longer than the lifetime of the StringPiece. -// (2) There may or may not be a '\0' character after the end of -// StringPiece data. -// (3) A null StringPiece is empty. -// An empty StringPiece may or may not be a null StringPiece. - -#ifndef GOOGLE_PROTOBUF_STUBS_STRINGPIECE_H_ -#define GOOGLE_PROTOBUF_STUBS_STRINGPIECE_H_ - -#include <assert.h> -#include <stddef.h> -#include <string.h> -#include <iosfwd> -#include <limits> -#include <string> - -#include <google/protobuf/stubs/common.h> -#include <google/protobuf/stubs/hash.h> - -namespace google { -namespace protobuf { -// StringPiece has *two* size types. -// StringPiece::size_type -// is unsigned -// is 32 bits in LP32, 64 bits in LP64, 64 bits in LLP64 -// no future changes intended -// stringpiece_ssize_type -// is signed -// is 32 bits in LP32, 64 bits in LP64, 64 bits in LLP64 -// future changes intended: http://go/64BitStringPiece -// -typedef string::difference_type stringpiece_ssize_type; - -// STRINGPIECE_CHECK_SIZE protects us from 32-bit overflows. -// TODO(mec): delete this after stringpiece_ssize_type goes 64 bit. -#if !defined(NDEBUG) -#define STRINGPIECE_CHECK_SIZE 1 -#elif defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 -#define STRINGPIECE_CHECK_SIZE 1 -#else -#define STRINGPIECE_CHECK_SIZE 0 -#endif - -class LIBPROTOBUF_EXPORT StringPiece { - private: - const char* ptr_; - stringpiece_ssize_type length_; - - // Prevent overflow in debug mode or fortified mode. - // sizeof(stringpiece_ssize_type) may be smaller than sizeof(size_t). - static stringpiece_ssize_type CheckedSsizeTFromSizeT(size_t size) { -#if STRINGPIECE_CHECK_SIZE > 0 -#ifdef max -#undef max -#endif - if (size > static_cast<size_t>( - std::numeric_limits<stringpiece_ssize_type>::max())) { - // Some people grep for this message in logs - // so take care if you ever change it. - LogFatalSizeTooBig(size, "size_t to int conversion"); - } -#endif - return static_cast<stringpiece_ssize_type>(size); - } - - // Out-of-line error path. - static void LogFatalSizeTooBig(size_t size, const char* details); - - public: - // We provide non-explicit singleton constructors so users can pass - // in a "const char*" or a "string" wherever a "StringPiece" is - // expected. - // - // Style guide exception granted: - // http://goto/style-guide-exception-20978288 - StringPiece() : ptr_(NULL), length_(0) {} - - StringPiece(const char* str) // NOLINT(runtime/explicit) - : ptr_(str), length_(0) { - if (str != NULL) { - length_ = CheckedSsizeTFromSizeT(strlen(str)); - } - } - - template <class Allocator> - StringPiece( // NOLINT(runtime/explicit) - const std::basic_string<char, std::char_traits<char>, Allocator>& str) - : ptr_(str.data()), length_(0) { - length_ = CheckedSsizeTFromSizeT(str.size()); - } -#if defined(HAS_GLOBAL_STRING) - template <class Allocator> - StringPiece( // NOLINT(runtime/explicit) - const basic_string<char, std::char_traits<char>, Allocator>& str) - : ptr_(str.data()), length_(0) { - length_ = CheckedSsizeTFromSizeT(str.size()); - } -#endif - - StringPiece(const char* offset, stringpiece_ssize_type len) - : ptr_(offset), length_(len) { - assert(len >= 0); - } - - // Substring of another StringPiece. - // pos must be non-negative and <= x.length(). - StringPiece(StringPiece x, stringpiece_ssize_type pos); - // Substring of another StringPiece. - // pos must be non-negative and <= x.length(). - // len must be non-negative and will be pinned to at most x.length() - pos. - StringPiece(StringPiece x, - stringpiece_ssize_type pos, - stringpiece_ssize_type len); - - // 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. - const char* data() const { return ptr_; } - stringpiece_ssize_type size() const { return length_; } - stringpiece_ssize_type length() const { return length_; } - bool empty() const { return length_ == 0; } - - void clear() { - ptr_ = NULL; - length_ = 0; - } - - void set(const char* data, stringpiece_ssize_type len) { - assert(len >= 0); - ptr_ = data; - length_ = len; - } - - void set(const char* str) { - ptr_ = str; - if (str != NULL) - length_ = CheckedSsizeTFromSizeT(strlen(str)); - else - length_ = 0; - } - - void set(const void* data, stringpiece_ssize_type len) { - ptr_ = reinterpret_cast<const char*>(data); - length_ = len; - } - - char operator[](stringpiece_ssize_type i) const { - assert(0 <= i); - assert(i < length_); - return ptr_[i]; - } - - void remove_prefix(stringpiece_ssize_type n) { - assert(length_ >= n); - ptr_ += n; - length_ -= n; - } - - void remove_suffix(stringpiece_ssize_type n) { - assert(length_ >= n); - length_ -= n; - } - - // returns {-1, 0, 1} - int compare(StringPiece x) const { - const stringpiece_ssize_type min_size = - length_ < x.length_ ? length_ : x.length_; - int r = memcmp(ptr_, x.ptr_, min_size); - if (r < 0) return -1; - if (r > 0) return 1; - if (length_ < x.length_) return -1; - if (length_ > x.length_) return 1; - return 0; - } - - string as_string() const { - return ToString(); - } - // We also define ToString() here, since many other string-like - // interfaces name the routine that converts to a C++ string - // "ToString", and it's confusing to have the method that does that - // for a StringPiece be called "as_string()". We also leave the - // "as_string()" method defined here for existing code. - string ToString() const { - if (ptr_ == NULL) return string(); - return string(data(), size()); - } - - operator string() const { - return ToString(); - } - - void CopyToString(string* target) const; - void AppendToString(string* target) const; - - bool starts_with(StringPiece x) const { - return (length_ >= x.length_) && (memcmp(ptr_, x.ptr_, x.length_) == 0); - } - - bool ends_with(StringPiece x) const { - return ((length_ >= x.length_) && - (memcmp(ptr_ + (length_-x.length_), x.ptr_, x.length_) == 0)); - } - - // Checks whether StringPiece starts with x and if so advances the beginning - // of it to past the match. It's basically a shortcut for starts_with - // followed by remove_prefix. - bool Consume(StringPiece x); - // Like above but for the end of the string. - bool ConsumeFromEnd(StringPiece x); - - // standard STL container boilerplate - typedef char value_type; - typedef const char* pointer; - typedef const char& reference; - typedef const char& const_reference; - typedef size_t size_type; - typedef ptrdiff_t difference_type; - static const size_type npos; - typedef const char* const_iterator; - typedef const char* iterator; - typedef std::reverse_iterator<const_iterator> const_reverse_iterator; - typedef std::reverse_iterator<iterator> reverse_iterator; - iterator begin() const { return ptr_; } - 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_); - } - stringpiece_ssize_type max_size() const { return length_; } - stringpiece_ssize_type capacity() const { return length_; } - - // cpplint.py emits a false positive [build/include_what_you_use] - stringpiece_ssize_type copy(char* buf, size_type n, size_type pos = 0) const; // NOLINT - - bool contains(StringPiece s) const; - - stringpiece_ssize_type find(StringPiece s, size_type pos = 0) const; - stringpiece_ssize_type find(char c, size_type pos = 0) const; - stringpiece_ssize_type rfind(StringPiece s, size_type pos = npos) const; - stringpiece_ssize_type rfind(char c, size_type pos = npos) const; - - stringpiece_ssize_type find_first_of(StringPiece s, size_type pos = 0) const; - stringpiece_ssize_type find_first_of(char c, size_type pos = 0) const { - return find(c, pos); - } - stringpiece_ssize_type find_first_not_of(StringPiece s, - size_type pos = 0) const; - stringpiece_ssize_type find_first_not_of(char c, size_type pos = 0) const; - stringpiece_ssize_type find_last_of(StringPiece s, - size_type pos = npos) const; - stringpiece_ssize_type find_last_of(char c, size_type pos = npos) const { - return rfind(c, pos); - } - stringpiece_ssize_type find_last_not_of(StringPiece s, - size_type pos = npos) const; - stringpiece_ssize_type find_last_not_of(char c, size_type pos = npos) const; - - StringPiece substr(size_type pos, size_type n = npos) const; -}; - -// This large function is defined inline so that in a fairly common case where -// one of the arguments is a literal, the compiler can elide a lot of the -// following comparisons. -inline bool operator==(StringPiece x, StringPiece y) { - stringpiece_ssize_type len = x.size(); - if (len != y.size()) { - return false; - } - - return x.data() == y.data() || len <= 0 || - memcmp(x.data(), y.data(), len) == 0; -} - -inline bool operator!=(StringPiece x, StringPiece y) { - return !(x == y); -} - -inline bool operator<(StringPiece x, StringPiece y) { - const stringpiece_ssize_type min_size = - x.size() < y.size() ? x.size() : y.size(); - const int r = memcmp(x.data(), y.data(), min_size); - return (r < 0) || (r == 0 && x.size() < y.size()); -} - -inline bool operator>(StringPiece x, StringPiece y) { - return y < x; -} - -inline bool operator<=(StringPiece x, StringPiece y) { - return !(x > y); -} - -inline bool operator>=(StringPiece x, StringPiece y) { - return !(x < y); -} - -// allow StringPiece to be logged -extern std::ostream& operator<<(std::ostream& o, StringPiece piece); - -} // namespace protobuf -} // namespace google - -GOOGLE_PROTOBUF_HASH_NAMESPACE_DECLARATION_START -template<> struct hash<StringPiece> { - size_t operator()(const StringPiece& s) const { - size_t result = 0; - for (const char *str = s.data(), *end = str + s.size(); str < end; str++) { - result = 5 * result + *str; - } - return result; - } -}; -GOOGLE_PROTOBUF_HASH_NAMESPACE_DECLARATION_END - -#endif // STRINGS_STRINGPIECE_H_ |