mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-06-15 22:29:43 +00:00
185 lines
6.1 KiB
C++
185 lines
6.1 KiB
C++
// Copyright (c) 2006-2008 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.
|
|
//
|
|
// Functions or methods may use const StringPiece& parameters to accept either
|
|
// a "const char*" or a "string" value that will be implicitly converted to
|
|
// a StringPiece. The implicit conversion means that it is often appropriate
|
|
// to include this .h file in other files rather than forward-declaring
|
|
// StringPiece as would be appropriate for most other Google classes.
|
|
//
|
|
// Systematic usage of StringPiece is encouraged as it will reduce unnecessary
|
|
// conversions from "const char*" to "string" and back again.
|
|
//
|
|
|
|
#ifndef BASE_STRING_PIECE_H_
|
|
#define BASE_STRING_PIECE_H_
|
|
|
|
#include <algorithm>
|
|
#include <iosfwd>
|
|
#include <string>
|
|
|
|
#include "base/basictypes.h"
|
|
|
|
class StringPiece {
|
|
public:
|
|
typedef size_t size_type;
|
|
|
|
private:
|
|
const char* ptr_;
|
|
size_type length_;
|
|
|
|
public:
|
|
// We provide non-explicit singleton constructors so users can pass
|
|
// in a "const char*" or a "string" wherever a "StringPiece" is
|
|
// expected.
|
|
StringPiece() : ptr_(NULL), length_(0) { }
|
|
MOZ_IMPLICIT StringPiece(const char* str)
|
|
: ptr_(str), length_((str == NULL) ? 0 : strlen(str)) { }
|
|
MOZ_IMPLICIT StringPiece(const std::string& str)
|
|
: ptr_(str.data()), length_(str.size()) { }
|
|
StringPiece(const char* offset, size_type len)
|
|
: ptr_(offset), length_(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_; }
|
|
size_type size() const { return length_; }
|
|
size_type length() const { return length_; }
|
|
bool empty() const { return length_ == 0; }
|
|
|
|
void clear() { ptr_ = NULL; length_ = 0; }
|
|
void set(const char* aData, size_type aLen) { ptr_ = aData; length_ = aLen; }
|
|
void set(const char* str) {
|
|
ptr_ = str;
|
|
length_ = str ? strlen(str) : 0;
|
|
}
|
|
void set(const void* aData, size_type aLen) {
|
|
ptr_ = reinterpret_cast<const char*>(aData);
|
|
length_ = aLen;
|
|
}
|
|
|
|
char operator[](size_type i) const { return ptr_[i]; }
|
|
|
|
void remove_prefix(size_type n) {
|
|
ptr_ += n;
|
|
length_ -= n;
|
|
}
|
|
|
|
void remove_suffix(size_type n) {
|
|
length_ -= n;
|
|
}
|
|
|
|
int compare(const StringPiece& x) const {
|
|
int r = wordmemcmp(ptr_, x.ptr_, std::min(length_, x.length_));
|
|
if (r == 0) {
|
|
if (length_ < x.length_) r = -1;
|
|
else if (length_ > x.length_) r = +1;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
std::string as_string() const {
|
|
// std::string doesn't like to take a NULL pointer even with a 0 size.
|
|
return std::string(!empty() ? data() : "", size());
|
|
}
|
|
|
|
void CopyToString(std::string* target) const;
|
|
void AppendToString(std::string* target) const;
|
|
|
|
// Does "this" start with "x"
|
|
bool starts_with(const StringPiece& x) const {
|
|
return ((length_ >= x.length_) &&
|
|
(wordmemcmp(ptr_, x.ptr_, x.length_) == 0));
|
|
}
|
|
|
|
// Does "this" end with "x"
|
|
bool ends_with(const StringPiece& x) const {
|
|
return ((length_ >= x.length_) &&
|
|
(wordmemcmp(ptr_ + (length_-x.length_), x.ptr_, x.length_) == 0));
|
|
}
|
|
|
|
// standard STL container boilerplate
|
|
typedef char value_type;
|
|
typedef const char* pointer;
|
|
typedef const char& reference;
|
|
typedef const char& const_reference;
|
|
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_);
|
|
}
|
|
|
|
size_type max_size() const { return length_; }
|
|
size_type capacity() const { return length_; }
|
|
|
|
size_type copy(char* buf, size_type n, size_type pos = 0) const;
|
|
|
|
size_type find(const StringPiece& s, size_type pos = 0) const;
|
|
size_type find(char c, size_type pos = 0) const;
|
|
size_type rfind(const StringPiece& s, size_type pos = npos) const;
|
|
size_type rfind(char c, size_type pos = npos) const;
|
|
|
|
size_type find_first_of(const StringPiece& s, size_type pos = 0) const;
|
|
size_type find_first_of(char c, size_type pos = 0) const {
|
|
return find(c, pos);
|
|
}
|
|
size_type find_first_not_of(const StringPiece& s, size_type pos = 0) const;
|
|
size_type find_first_not_of(char c, size_type pos = 0) const;
|
|
size_type find_last_of(const StringPiece& s, size_type pos = npos) const;
|
|
size_type find_last_of(char c, size_type pos = npos) const {
|
|
return rfind(c, pos);
|
|
}
|
|
size_type find_last_not_of(const StringPiece& s, size_type pos = npos) const;
|
|
size_type find_last_not_of(char c, size_type pos = npos) const;
|
|
|
|
StringPiece substr(size_type pos, size_type n = npos) const;
|
|
|
|
static int wordmemcmp(const char* p, const char* p2, size_type N) {
|
|
return memcmp(p, p2, N);
|
|
}
|
|
};
|
|
|
|
bool operator==(const ::StringPiece& x, const ::StringPiece& y);
|
|
|
|
inline bool operator!=(const ::StringPiece& x, const ::StringPiece& y) {
|
|
return !(x == y);
|
|
}
|
|
|
|
inline bool operator<(const ::StringPiece& x, const ::StringPiece& y) {
|
|
const int r = ::StringPiece::wordmemcmp(x.data(), y.data(),
|
|
std::min(x.size(), y.size()));
|
|
return ((r < 0) || ((r == 0) && (x.size() < y.size())));
|
|
}
|
|
|
|
inline bool operator>(const ::StringPiece& x, const ::StringPiece& y) {
|
|
return y < x;
|
|
}
|
|
|
|
inline bool operator<=(const ::StringPiece& x, const ::StringPiece& y) {
|
|
return !(x > y);
|
|
}
|
|
|
|
inline bool operator>=(const ::StringPiece& x, const ::StringPiece& y) {
|
|
return !(x < y);
|
|
}
|
|
|
|
// allow StringPiece to be logged (needed for unit testing).
|
|
extern std::ostream& operator<<(std::ostream& o, const ::StringPiece& piece);
|
|
|
|
#endif // BASE_STRING_PIECE_H_
|