15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright 2004 The RE2 Authors. All Rights Reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// license that can be found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "re2/stringpiece.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "util/util.h" 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)using re2::StringPiece; 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)std::ostream& operator<<(std::ostream& o, const StringPiece& piece) { 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) o.write(piece.data(), piece.size()); 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return o; 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool StringPiece::_equal(const StringPiece& x, const StringPiece& y) { 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int len = x.size(); 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (len != y.size()) { 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* p = x.data(); 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* p2 = y.data(); 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Test last byte in case strings share large common prefix 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if ((len > 0) && (p[len-1] != p2[len-1])) return false; 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* p_limit = p + len; 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (; p < p_limit; p++, p2++) { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (*p != *p2) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void StringPiece::CopyToString(string* target) const { 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) target->assign(ptr_, length_); 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int StringPiece::copy(char* buf, size_type n, size_type pos) const { 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int ret = min(length_ - pos, n); 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(buf, ptr_ + pos, ret); 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ret; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int StringPiece::find(const StringPiece& s, size_type pos) const { 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (length_ < 0 || pos > static_cast<size_type>(length_)) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return npos; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* result = std::search(ptr_ + pos, ptr_ + length_, 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) s.ptr_, s.ptr_ + s.length_); 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_type xpos = result - ptr_; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return xpos + s.length_ <= length_ ? xpos : npos; 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int StringPiece::find(char c, size_type pos) const { 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (length_ <= 0 || pos >= static_cast<size_type>(length_)) { 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return npos; 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* result = std::find(ptr_ + pos, ptr_ + length_, c); 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return result != ptr_ + length_ ? result - ptr_ : npos; 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int StringPiece::rfind(const StringPiece& s, size_type pos) const { 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (length_ < s.length_) return npos; 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t ulen = length_; 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (s.length_ == 0) return min(ulen, pos); 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* last = ptr_ + min(ulen - s.length_, pos) + s.length_; 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* result = std::find_end(ptr_, last, s.ptr_, s.ptr_ + s.length_); 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return result != last ? result - ptr_ : npos; 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int StringPiece::rfind(char c, size_type pos) const { 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (length_ <= 0) return npos; 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (int i = min(pos, static_cast<size_type>(length_ - 1)); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) i >= 0; --i) { 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (ptr_[i] == c) { 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return i; 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return npos; 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)StringPiece StringPiece::substr(size_type pos, size_type n) const { 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (pos > length_) pos = length_; 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (n > length_ - pos) n = length_ - pos; 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return StringPiece(ptr_ + pos, n); 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)const StringPiece::size_type StringPiece::npos = size_type(-1); 88