diff options
Diffstat (limited to 'klm/util/string_piece.cc')
-rw-r--r-- | klm/util/string_piece.cc | 193 |
1 files changed, 1 insertions, 192 deletions
diff --git a/klm/util/string_piece.cc b/klm/util/string_piece.cc index ec394b96..973091c4 100644 --- a/klm/util/string_piece.cc +++ b/klm/util/string_piece.cc @@ -1,193 +1,2 @@ -// Copyright 2004 The RE2 Authors. All Rights Reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in string_piece.hh. +// this has been moved to utils/ in cdec -#include "util/string_piece.hh" - -#include <algorithm> - -#include <limits.h> - -#ifndef HAVE_ICU - -typedef StringPiece::size_type size_type; - -void StringPiece::CopyToString(std::string* target) const { - target->assign(ptr_, length_); -} - -size_type StringPiece::find(const StringPiece& s, size_type pos) const { - // Not sure why length_ < 0 was here since it's std::size_t. - if (/*length_ < 0 || */pos > static_cast<size_type>(length_)) - return npos; - - const char* result = std::search(ptr_ + pos, ptr_ + length_, - s.ptr_, s.ptr_ + s.length_); - const size_type xpos = result - ptr_; - return xpos + s.length_ <= length_ ? xpos : npos; -} - -size_type StringPiece::find(char c, size_type pos) const { - if (length_ <= 0 || pos >= static_cast<size_type>(length_)) { - return npos; - } - const char* result = std::find(ptr_ + pos, ptr_ + length_, c); - return result != ptr_ + length_ ? result - ptr_ : npos; -} - -size_type StringPiece::rfind(const StringPiece& s, size_type pos) const { - if (length_ < s.length_) return npos; - const size_t ulen = length_; - if (s.length_ == 0) return std::min(ulen, pos); - - const char* last = ptr_ + std::min(ulen - s.length_, pos) + s.length_; - const char* result = std::find_end(ptr_, last, s.ptr_, s.ptr_ + s.length_); - return result != last ? result - ptr_ : npos; -} - -size_type StringPiece::rfind(char c, size_type pos) const { - if (length_ <= 0) return npos; - for (int i = std::min(pos, static_cast<size_type>(length_ - 1)); - i >= 0; --i) { - if (ptr_[i] == c) { - return i; - } - } - return npos; -} - -// For each character in characters_wanted, sets the index corresponding -// to the ASCII code of that character to 1 in table. This is used by -// the find_.*_of methods below to tell whether or not a character is in -// the lookup table in constant time. -// The argument `table' must be an array that is large enough to hold all -// the possible values of an unsigned char. Thus it should be be declared -// as follows: -// bool table[UCHAR_MAX + 1] -static inline void BuildLookupTable(const StringPiece& characters_wanted, - bool* table) { - const size_type length = characters_wanted.length(); - const char* const data = characters_wanted.data(); - for (size_type i = 0; i < length; ++i) { - table[static_cast<unsigned char>(data[i])] = true; - } -} - -size_type StringPiece::find_first_of(const StringPiece& s, - size_type pos) const { - if (length_ == 0 || s.length_ == 0) - return npos; - - // Avoid the cost of BuildLookupTable() for a single-character search. - if (s.length_ == 1) - return find_first_of(s.ptr_[0], pos); - - bool lookup[UCHAR_MAX + 1] = { false }; - BuildLookupTable(s, lookup); - for (size_type i = pos; i < length_; ++i) { - if (lookup[static_cast<unsigned char>(ptr_[i])]) { - return i; - } - } - return npos; -} - -size_type StringPiece::find_first_not_of(const StringPiece& s, - size_type pos) const { - if (length_ == 0) - return npos; - - if (s.length_ == 0) - return 0; - - // Avoid the cost of BuildLookupTable() for a single-character search. - if (s.length_ == 1) - return find_first_not_of(s.ptr_[0], pos); - - bool lookup[UCHAR_MAX + 1] = { false }; - BuildLookupTable(s, lookup); - for (size_type i = pos; i < length_; ++i) { - if (!lookup[static_cast<unsigned char>(ptr_[i])]) { - return i; - } - } - return npos; -} - -size_type StringPiece::find_first_not_of(char c, size_type pos) const { - if (length_ == 0) - return npos; - - for (; pos < length_; ++pos) { - if (ptr_[pos] != c) { - return pos; - } - } - return npos; -} - -size_type StringPiece::find_last_of(const StringPiece& s, size_type pos) const { - if (length_ == 0 || s.length_ == 0) - return npos; - - // Avoid the cost of BuildLookupTable() for a single-character search. - if (s.length_ == 1) - return find_last_of(s.ptr_[0], pos); - - bool lookup[UCHAR_MAX + 1] = { false }; - BuildLookupTable(s, lookup); - for (size_type i = std::min(pos, length_ - 1); ; --i) { - if (lookup[static_cast<unsigned char>(ptr_[i])]) - return i; - if (i == 0) - break; - } - return npos; -} - -size_type StringPiece::find_last_not_of(const StringPiece& s, - size_type pos) const { - if (length_ == 0) - return npos; - - size_type i = std::min(pos, length_ - 1); - if (s.length_ == 0) - return i; - - // Avoid the cost of BuildLookupTable() for a single-character search. - if (s.length_ == 1) - return find_last_not_of(s.ptr_[0], pos); - - bool lookup[UCHAR_MAX + 1] = { false }; - BuildLookupTable(s, lookup); - for (; ; --i) { - if (!lookup[static_cast<unsigned char>(ptr_[i])]) - return i; - if (i == 0) - break; - } - return npos; -} - -size_type StringPiece::find_last_not_of(char c, size_type pos) const { - if (length_ == 0) - return npos; - - for (size_type i = std::min(pos, length_ - 1); ; --i) { - if (ptr_[i] != c) - return i; - if (i == 0) - break; - } - return npos; -} - -StringPiece StringPiece::substr(size_type pos, size_type n) const { - if (pos > length_) pos = length_; - if (n > length_ - pos) n = length_ - pos; - return StringPiece(ptr_ + pos, n); -} - -const size_type StringPiece::npos = size_type(-1); - -#endif // !HAVE_ICU |