79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
// Copyright 2013 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// A StringPiece points to part or all of a string, double-quoted string
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// literal, or other string-like object. A StringPiece does *not* own the
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// string to which it points. A StringPiece is not null-terminated. [subset]
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//
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#ifndef STRINGS_STRINGPIECE_H_
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#define STRINGS_STRINGPIECE_H_
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#include <string.h>
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#include <string>
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typedef int stringpiece_ssize_type;
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class StringPiece {
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private:
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const char* ptr_;
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stringpiece_ssize_type length_;
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public:
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// We provide non-explicit singleton constructors so users can pass
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// in a "const char*" or a "string" wherever a "StringPiece" is
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// expected.
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StringPiece() : ptr_(NULL), length_(0) {}
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StringPiece(const char* str) // NOLINT(runtime/explicit)
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: ptr_(str), length_(0) {
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if (str != NULL) {
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length_ = strlen(str);
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}
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}
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StringPiece(const std::string& str) // NOLINT(runtime/explicit)
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: ptr_(str.data()), length_(0) {
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length_ = str.size();
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}
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StringPiece(const char* offset, stringpiece_ssize_type len)
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: ptr_(offset), length_(len) {
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}
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void remove_prefix(stringpiece_ssize_type n) {
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ptr_ += n;
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length_ -= n;
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}
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void remove_suffix(stringpiece_ssize_type n) {
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length_ -= n;
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}
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// data() may return a pointer to a buffer with embedded NULs, and the
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// returned buffer may or may not be null terminated. Therefore it is
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// typically a mistake to pass data() to a routine that expects a NUL
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// terminated string.
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const char* data() const { return ptr_; }
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stringpiece_ssize_type size() const { return length_; }
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stringpiece_ssize_type length() const { return length_; }
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bool empty() const { return length_ == 0; }
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};
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class StringPiece;
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#endif // STRINGS_STRINGPIECE_H__
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