413 lines
12 KiB
C++
413 lines
12 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Copied from strings/stringpiece.cc with modifications
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#include "base/strings/string_piece.h"
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#include <limits.h>
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#include <algorithm>
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#include <ostream>
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#include "base/logging.h"
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#include "base/strings/utf_string_conversions.h"
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namespace base {
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namespace {
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// For each character in characters_wanted, sets the index corresponding
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// to the ASCII code of that character to 1 in table. This is used by
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// the find_.*_of methods below to tell whether or not a character is in
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// the lookup table in constant time.
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// The argument `table' must be an array that is large enough to hold all
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// the possible values of an unsigned char. Thus it should be be declared
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// as follows:
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// bool table[UCHAR_MAX + 1]
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inline void BuildLookupTable(const StringPiece& characters_wanted,
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bool* table) {
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const size_t length = characters_wanted.length();
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const char* const data = characters_wanted.data();
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for (size_t i = 0; i < length; ++i) {
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table[static_cast<unsigned char>(data[i])] = true;
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}
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}
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} // namespace
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// MSVC doesn't like complex extern templates and DLLs.
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#if !defined(COMPILER_MSVC)
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template class BasicStringPiece<std::string>;
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template class BasicStringPiece<string16>;
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#endif
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std::ostream& operator<<(std::ostream& o, const StringPiece& piece) {
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o.write(piece.data(), static_cast<std::streamsize>(piece.size()));
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return o;
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}
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std::ostream& operator<<(std::ostream& o, const StringPiece16& piece) {
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return o << UTF16ToUTF8(piece);
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}
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namespace internal {
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template<typename STR>
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size_t copyT(const BasicStringPiece<STR>& self,
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typename STR::value_type* buf,
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size_t n,
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size_t pos) {
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size_t ret = std::min(self.size() - pos, n);
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memcpy(buf, self.data() + pos, ret * sizeof(typename STR::value_type));
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return ret;
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}
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size_t copy(const StringPiece& self, char* buf, size_t n, size_t pos) {
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return copyT(self, buf, n, pos);
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}
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size_t copy(const StringPiece16& self, char16* buf, size_t n, size_t pos) {
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return copyT(self, buf, n, pos);
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}
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template<typename STR>
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size_t findT(const BasicStringPiece<STR>& self,
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const BasicStringPiece<STR>& s,
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size_t pos) {
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if (pos > self.size())
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return BasicStringPiece<STR>::npos;
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typename BasicStringPiece<STR>::const_iterator result =
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std::search(self.begin() + pos, self.end(), s.begin(), s.end());
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const size_t xpos =
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static_cast<size_t>(result - self.begin());
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return xpos + s.size() <= self.size() ? xpos : BasicStringPiece<STR>::npos;
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}
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size_t find(const StringPiece& self, const StringPiece& s, size_t pos) {
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return findT(self, s, pos);
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}
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size_t find(const StringPiece16& self, const StringPiece16& s, size_t pos) {
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return findT(self, s, pos);
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}
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template<typename STR>
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size_t findT(const BasicStringPiece<STR>& self,
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typename STR::value_type c,
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size_t pos) {
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if (pos >= self.size())
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return BasicStringPiece<STR>::npos;
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typename BasicStringPiece<STR>::const_iterator result =
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std::find(self.begin() + pos, self.end(), c);
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return result != self.end() ?
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static_cast<size_t>(result - self.begin()) : BasicStringPiece<STR>::npos;
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}
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size_t find(const StringPiece& self, char c, size_t pos) {
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return findT(self, c, pos);
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}
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size_t find(const StringPiece16& self, char16 c, size_t pos) {
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return findT(self, c, pos);
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}
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template<typename STR>
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size_t rfindT(const BasicStringPiece<STR>& self,
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const BasicStringPiece<STR>& s,
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size_t pos) {
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if (self.size() < s.size())
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return BasicStringPiece<STR>::npos;
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if (s.empty())
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return std::min(self.size(), pos);
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typename BasicStringPiece<STR>::const_iterator last =
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self.begin() + std::min(self.size() - s.size(), pos) + s.size();
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typename BasicStringPiece<STR>::const_iterator result =
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std::find_end(self.begin(), last, s.begin(), s.end());
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return result != last ?
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static_cast<size_t>(result - self.begin()) : BasicStringPiece<STR>::npos;
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}
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size_t rfind(const StringPiece& self, const StringPiece& s, size_t pos) {
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return rfindT(self, s, pos);
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}
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size_t rfind(const StringPiece16& self, const StringPiece16& s, size_t pos) {
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return rfindT(self, s, pos);
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}
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template<typename STR>
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size_t rfindT(const BasicStringPiece<STR>& self,
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typename STR::value_type c,
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size_t pos) {
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if (self.size() == 0)
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return BasicStringPiece<STR>::npos;
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for (size_t i = std::min(pos, self.size() - 1); ;
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--i) {
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if (self.data()[i] == c)
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return i;
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if (i == 0)
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break;
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}
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return BasicStringPiece<STR>::npos;
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}
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size_t rfind(const StringPiece& self, char c, size_t pos) {
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return rfindT(self, c, pos);
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}
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size_t rfind(const StringPiece16& self, char16 c, size_t pos) {
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return rfindT(self, c, pos);
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}
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// 8-bit version using lookup table.
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size_t find_first_of(const StringPiece& self,
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const StringPiece& s,
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size_t pos) {
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if (self.size() == 0 || s.size() == 0)
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return StringPiece::npos;
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// Avoid the cost of BuildLookupTable() for a single-character search.
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if (s.size() == 1)
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return find(self, s.data()[0], pos);
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bool lookup[UCHAR_MAX + 1] = { false };
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BuildLookupTable(s, lookup);
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for (size_t i = pos; i < self.size(); ++i) {
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if (lookup[static_cast<unsigned char>(self.data()[i])]) {
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return i;
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}
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}
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return StringPiece::npos;
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}
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// 16-bit brute force version.
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size_t find_first_of(const StringPiece16& self,
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const StringPiece16& s,
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size_t pos) {
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// Use the faster std::find() if searching for a single character.
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StringPiece16::const_iterator found =
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s.size() == 1 ? std::find(self.begin() + pos, self.end(), s[0])
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: std::find_first_of(self.begin() + pos, self.end(),
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s.begin(), s.end());
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if (found == self.end())
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return StringPiece16::npos;
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return found - self.begin();
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}
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// 8-bit version using lookup table.
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size_t find_first_not_of(const StringPiece& self,
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const StringPiece& s,
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size_t pos) {
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if (self.size() == 0)
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return StringPiece::npos;
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if (s.size() == 0)
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return 0;
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// Avoid the cost of BuildLookupTable() for a single-character search.
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if (s.size() == 1)
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return find_first_not_of(self, s.data()[0], pos);
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bool lookup[UCHAR_MAX + 1] = { false };
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BuildLookupTable(s, lookup);
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for (size_t i = pos; i < self.size(); ++i) {
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if (!lookup[static_cast<unsigned char>(self.data()[i])]) {
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return i;
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}
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}
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return StringPiece::npos;
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}
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// 16-bit brute-force version.
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BASE_EXPORT size_t find_first_not_of(const StringPiece16& self,
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const StringPiece16& s,
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size_t pos) {
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if (self.size() == 0)
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return StringPiece16::npos;
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for (size_t self_i = pos; self_i < self.size(); ++self_i) {
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bool found = false;
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for (auto c : s) {
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if (self[self_i] == c) {
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found = true;
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break;
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}
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}
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if (!found)
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return self_i;
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}
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return StringPiece16::npos;
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}
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template<typename STR>
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size_t find_first_not_ofT(const BasicStringPiece<STR>& self,
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typename STR::value_type c,
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size_t pos) {
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if (self.size() == 0)
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return BasicStringPiece<STR>::npos;
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for (; pos < self.size(); ++pos) {
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if (self.data()[pos] != c) {
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return pos;
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}
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}
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return BasicStringPiece<STR>::npos;
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}
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size_t find_first_not_of(const StringPiece& self,
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char c,
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size_t pos) {
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return find_first_not_ofT(self, c, pos);
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}
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size_t find_first_not_of(const StringPiece16& self,
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char16 c,
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size_t pos) {
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return find_first_not_ofT(self, c, pos);
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}
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// 8-bit version using lookup table.
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size_t find_last_of(const StringPiece& self, const StringPiece& s, size_t pos) {
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if (self.size() == 0 || s.size() == 0)
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return StringPiece::npos;
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// Avoid the cost of BuildLookupTable() for a single-character search.
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if (s.size() == 1)
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return rfind(self, s.data()[0], pos);
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bool lookup[UCHAR_MAX + 1] = { false };
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BuildLookupTable(s, lookup);
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for (size_t i = std::min(pos, self.size() - 1); ; --i) {
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if (lookup[static_cast<unsigned char>(self.data()[i])])
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return i;
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if (i == 0)
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break;
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}
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return StringPiece::npos;
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}
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// 16-bit brute-force version.
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size_t find_last_of(const StringPiece16& self,
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const StringPiece16& s,
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size_t pos) {
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if (self.size() == 0)
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return StringPiece16::npos;
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for (size_t self_i = std::min(pos, self.size() - 1); ;
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--self_i) {
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for (auto c : s) {
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if (self.data()[self_i] == c)
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return self_i;
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}
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if (self_i == 0)
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break;
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}
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return StringPiece16::npos;
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}
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// 8-bit version using lookup table.
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size_t find_last_not_of(const StringPiece& self,
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const StringPiece& s,
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size_t pos) {
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if (self.size() == 0)
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return StringPiece::npos;
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size_t i = std::min(pos, self.size() - 1);
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if (s.size() == 0)
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return i;
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// Avoid the cost of BuildLookupTable() for a single-character search.
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if (s.size() == 1)
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return find_last_not_of(self, s.data()[0], pos);
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bool lookup[UCHAR_MAX + 1] = { false };
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BuildLookupTable(s, lookup);
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for (; ; --i) {
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if (!lookup[static_cast<unsigned char>(self.data()[i])])
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return i;
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if (i == 0)
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break;
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}
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return StringPiece::npos;
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}
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// 16-bit brute-force version.
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size_t find_last_not_of(const StringPiece16& self,
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const StringPiece16& s,
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size_t pos) {
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if (self.size() == 0)
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return StringPiece::npos;
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for (size_t self_i = std::min(pos, self.size() - 1); ; --self_i) {
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bool found = false;
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for (auto c : s) {
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if (self.data()[self_i] == c) {
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found = true;
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break;
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}
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}
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if (!found)
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return self_i;
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if (self_i == 0)
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break;
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}
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return StringPiece16::npos;
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}
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template<typename STR>
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size_t find_last_not_ofT(const BasicStringPiece<STR>& self,
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typename STR::value_type c,
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size_t pos) {
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if (self.size() == 0)
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return BasicStringPiece<STR>::npos;
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for (size_t i = std::min(pos, self.size() - 1); ; --i) {
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if (self.data()[i] != c)
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return i;
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if (i == 0)
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break;
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}
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return BasicStringPiece<STR>::npos;
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}
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size_t find_last_not_of(const StringPiece& self,
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char c,
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size_t pos) {
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return find_last_not_ofT(self, c, pos);
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}
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size_t find_last_not_of(const StringPiece16& self,
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char16 c,
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size_t pos) {
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return find_last_not_ofT(self, c, pos);
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}
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template<typename STR>
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BasicStringPiece<STR> substrT(const BasicStringPiece<STR>& self,
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size_t pos,
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size_t n) {
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if (pos > self.size()) pos = self.size();
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if (n > self.size() - pos) n = self.size() - pos;
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return BasicStringPiece<STR>(self.data() + pos, n);
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}
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StringPiece substr(const StringPiece& self,
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size_t pos,
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size_t n) {
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return substrT(self, pos, n);
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}
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StringPiece16 substr(const StringPiece16& self,
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size_t pos,
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size_t n) {
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return substrT(self, pos, n);
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}
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} // namespace internal
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} // namespace base
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