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// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// A StringPiece points to part or all of a string, 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. [subset]
//
#ifndef STRINGS_STRINGPIECE_H_
#define STRINGS_STRINGPIECE_H_
#include <string.h>
#include <string>
typedef int stringpiece_ssize_type;
class StringPiece {
private:
const char* ptr_;
stringpiece_ssize_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) {}
StringPiece(const char* str) // NOLINT(runtime/explicit)
: ptr_(str), length_(0) {
if (str != NULL) {
length_ = strlen(str);
}
}
StringPiece(const std::string& str) // NOLINT(runtime/explicit)
: ptr_(str.data()), length_(0) {
length_ = str.size();
}
StringPiece(const char* offset, stringpiece_ssize_type len)
: ptr_(offset), length_(len) {
}
void remove_prefix(stringpiece_ssize_type n) {
ptr_ += n;
length_ -= n;
}
void remove_suffix(stringpiece_ssize_type n) {
length_ -= n;
}
// 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; }
};
class StringPiece;
#endif // STRINGS_STRINGPIECE_H__
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