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This is one of those little chores in managing a long-lived C++ project: standard C headers like stdio.h and math.h now have their own place in the C++ standard as resp. cstdio, cmath, and so on. In this branch the #include names are updated for the util/ subdirectory; more branches to follow. C++11 adds cstdint, but to support compilation with the previous standard, that change is left for later.
193 lines
5.4 KiB
C++
193 lines
5.4 KiB
C++
// Copyright 2004 The RE2 Authors. All Rights Reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in string_piece.hh.
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#include "util/string_piece.hh"
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#include <algorithm>
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#include <climits>
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#ifndef HAVE_ICU
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typedef StringPiece::size_type size_type;
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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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size_type StringPiece::find(const StringPiece& s, size_type pos) const {
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// Not sure why length_ < 0 was here since it's std::size_t.
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if (/*length_ < 0 || */pos > static_cast<size_type>(length_))
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return npos;
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const char* result = std::search(ptr_ + pos, ptr_ + length_,
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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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size_type StringPiece::find(char c, 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::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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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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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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// 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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static inline void BuildLookupTable(const StringPiece& characters_wanted,
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bool* table) {
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const size_type length = characters_wanted.length();
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const char* const data = characters_wanted.data();
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for (size_type 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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size_type StringPiece::find_first_of(const StringPiece& s,
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size_type pos) const {
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if (length_ == 0 || s.length_ == 0)
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return npos;
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// Avoid the cost of BuildLookupTable() for a single-character search.
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if (s.length_ == 1)
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return find_first_of(s.ptr_[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_type i = pos; i < length_; ++i) {
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if (lookup[static_cast<unsigned char>(ptr_[i])]) {
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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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size_type StringPiece::find_first_not_of(const StringPiece& s,
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size_type pos) const {
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if (length_ == 0)
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return npos;
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if (s.length_ == 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.length_ == 1)
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return find_first_not_of(s.ptr_[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_type i = pos; i < length_; ++i) {
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if (!lookup[static_cast<unsigned char>(ptr_[i])]) {
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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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size_type StringPiece::find_first_not_of(char c, size_type pos) const {
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if (length_ == 0)
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return npos;
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for (; pos < length_; ++pos) {
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if (ptr_[pos] != c) {
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return pos;
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}
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}
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return npos;
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}
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size_type StringPiece::find_last_of(const StringPiece& s, size_type pos) const {
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if (length_ == 0 || s.length_ == 0)
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return npos;
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// Avoid the cost of BuildLookupTable() for a single-character search.
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if (s.length_ == 1)
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return find_last_of(s.ptr_[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_type i = std::min(pos, length_ - 1); ; --i) {
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if (lookup[static_cast<unsigned char>(ptr_[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 npos;
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}
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size_type StringPiece::find_last_not_of(const StringPiece& s,
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size_type pos) const {
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if (length_ == 0)
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return npos;
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size_type i = std::min(pos, length_ - 1);
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if (s.length_ == 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.length_ == 1)
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return find_last_not_of(s.ptr_[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>(ptr_[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 npos;
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}
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size_type StringPiece::find_last_not_of(char c, size_type pos) const {
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if (length_ == 0)
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return npos;
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for (size_type i = std::min(pos, length_ - 1); ; --i) {
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if (ptr_[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 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 > 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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const size_type StringPiece::npos = size_type(-1);
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#endif // !HAVE_ICU
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