101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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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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#include "stringpiece.h"
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#include <ostream>
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#include <utility>
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#include "logging.h"
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namespace art {
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#if !defined(NDEBUG)
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char StringPiece::operator[](size_type i) const {
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CHECK_LT(i, length_);
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return ptr_[i];
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}
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#endif
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void StringPiece::CopyToString(std::string* target) const {
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target->assign(ptr_, length_);
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}
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StringPiece::size_type StringPiece::copy(char* buf, size_type n, size_type pos) const {
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size_type ret = std::min(length_ - pos, n);
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memcpy(buf, ptr_ + pos, ret);
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return ret;
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}
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StringPiece::size_type StringPiece::find(const StringPiece& s, size_type pos) const {
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if (length_ == 0 || pos > static_cast<size_type>(length_)) {
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return npos;
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}
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const char* result = std::search(ptr_ + pos, ptr_ + length_, s.ptr_, s.ptr_ + s.length_);
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const size_type xpos = result - ptr_;
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return xpos + s.length_ <= length_ ? xpos : npos;
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}
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int StringPiece::compare(const StringPiece& x) const {
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int r = memcmp(ptr_, x.ptr_, std::min(length_, x.length_));
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if (r == 0) {
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if (length_ < x.length_) r = -1;
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else if (length_ > x.length_) r = +1;
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}
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return r;
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}
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StringPiece::size_type StringPiece::find(char c, size_type pos) const {
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if (length_ == 0 || pos >= length_) {
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return npos;
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}
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const char* result = std::find(ptr_ + pos, ptr_ + length_, c);
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return result != ptr_ + length_ ? result - ptr_ : npos;
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}
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StringPiece::size_type StringPiece::rfind(const StringPiece& s, size_type pos) const {
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if (length_ < s.length_) return npos;
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const size_t ulen = length_;
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if (s.length_ == 0) return std::min(ulen, pos);
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const char* last = ptr_ + std::min(ulen - s.length_, pos) + s.length_;
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const char* result = std::find_end(ptr_, last, s.ptr_, s.ptr_ + s.length_);
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return result != last ? result - ptr_ : npos;
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}
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StringPiece::size_type StringPiece::rfind(char c, size_type pos) const {
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if (length_ == 0) return npos;
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for (int i = std::min(pos, static_cast<size_type>(length_ - 1));
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i >= 0; --i) {
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if (ptr_[i] == c) {
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return i;
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}
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}
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return npos;
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}
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StringPiece StringPiece::substr(size_type pos, size_type n) const {
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if (pos > static_cast<size_type>(length_)) pos = length_;
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if (n > length_ - pos) n = length_ - pos;
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return StringPiece(ptr_ + pos, n);
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}
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std::ostream& operator<<(std::ostream& o, const StringPiece& piece) {
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o.write(piece.data(), piece.size());
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return o;
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}
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} // namespace art
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