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// StringPiece is a simple structure containing a pointer into some external
// storage and a size. The user of a StringPiece must ensure that the slice
// is not used after the corresponding external storage has been
// deallocated.
//
// Multiple threads can invoke const methods on a StringPiece without
// external synchronization, but if any of the threads may call a
// non-const method, all threads accessing the same StringPiece must use
// external synchronization.
#ifndef TENSORFLOW_LIB_CORE_STRINGPIECE_H_
#define TENSORFLOW_LIB_CORE_STRINGPIECE_H_
#include <assert.h>
#include <stddef.h>
#include <string.h>
#include <iosfwd>
#include <string>
#include "tensorflow/core/platform/port.h"
namespace tensorflow {
class StringPiece {
public:
typedef size_t size_type;
// Create an empty slice.
StringPiece() : data_(""), size_(0) {}
// Create a slice that refers to d[0,n-1].
StringPiece(const char* d, size_t n) : data_(d), size_(n) {}
// Create a slice that refers to the contents of "s"
StringPiece(const string& s) : data_(s.data()), size_(s.size()) {}
// Create a slice that refers to s[0,strlen(s)-1]
StringPiece(const char* s) : data_(s), size_(strlen(s)) {}
void set(const void* data, size_t len) {
data_ = reinterpret_cast<const char*>(data);
size_ = len;
}
// Return a pointer to the beginning of the referenced data
const char* data() const { return data_; }
// Return the length (in bytes) of the referenced data
size_t size() const { return size_; }
// Return true iff the length of the referenced data is zero
bool empty() const { return size_ == 0; }
typedef const char* const_iterator;
typedef const char* iterator;
iterator begin() const { return data_; }
iterator end() const { return data_ + size_; }
static const size_t npos;
// Return the ith byte in the referenced data.
// REQUIRES: n < size()
char operator[](size_t n) const {
assert(n < size());
return data_[n];
}
// Change this slice to refer to an empty array
void clear() {
data_ = "";
size_ = 0;
}
// Drop the first "n" bytes from this slice.
void remove_prefix(size_t n) {
assert(n <= size());
data_ += n;
size_ -= n;
}
void remove_suffix(size_t n) {
assert(size_ >= n);
size_ -= n;
}
size_t find(char c, size_t pos = 0) const;
size_t rfind(char c, size_t pos = npos) const;
bool contains(StringPiece s) const;
// 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);
StringPiece substr(size_t pos, size_t n = npos) const;
struct Hasher {
size_t operator()(StringPiece arg) const;
};
// Return a string that contains the copy of the referenced data.
std::string ToString() const { return std::string(data_, size_); }
// Three-way comparison. Returns value:
// < 0 iff "*this" < "b",
// == 0 iff "*this" == "b",
// > 0 iff "*this" > "b"
int compare(StringPiece b) const;
// Return true iff "x" is a prefix of "*this"
bool starts_with(StringPiece x) const {
return ((size_ >= x.size_) && (memcmp(data_, x.data_, x.size_) == 0));
}
// Return true iff "x" is a suffix of "*this"
bool ends_with(StringPiece x) const {
return ((size_ >= x.size_) &&
(memcmp(data_ + (size_ - x.size_), x.data_, x.size_) == 0));
}
private:
const char* data_;
size_t size_;
// Intentionally copyable
};
inline bool operator==(StringPiece x, StringPiece y) {
return ((x.size() == y.size()) &&
(memcmp(x.data(), y.data(), x.size()) == 0));
}
inline bool operator!=(StringPiece x, StringPiece y) { return !(x == y); }
inline bool operator<(StringPiece x, StringPiece y) { return x.compare(y) < 0; }
inline bool operator>(StringPiece x, StringPiece y) { return x.compare(y) > 0; }
inline bool operator<=(StringPiece x, StringPiece y) {
return x.compare(y) <= 0;
}
inline bool operator>=(StringPiece x, StringPiece y) {
return x.compare(y) >= 0;
}
inline int StringPiece::compare(StringPiece b) const {
const size_t min_len = (size_ < b.size_) ? size_ : b.size_;
int r = memcmp(data_, b.data_, min_len);
if (r == 0) {
if (size_ < b.size_)
r = -1;
else if (size_ > b.size_)
r = +1;
}
return r;
}
// allow StringPiece to be logged
extern std::ostream& operator<<(std::ostream& o, tensorflow::StringPiece piece);
} // namespace tensorflow
#endif // TENSORFLOW_LIB_CORE_STRINGPIECE_H_
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