387 lines
15 KiB
C++
387 lines
15 KiB
C++
/*
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Copyright (c) Marshall Clow 2012-2012.
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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For more information, see http://www.boost.org
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Based on the StringRef implementation in LLVM (http://llvm.org) and
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N3422 by Jeffrey Yasskin
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http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3442.html
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*/
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#ifndef BOOST_STRING_REF_HPP
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#define BOOST_STRING_REF_HPP
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#include <stdexcept>
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#include <algorithm>
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#include <functional>
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#include <string>
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namespace boost {
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namespace detail {
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// A helper functor because sometimes we don't have lambdas
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template <typename charT, typename traits>
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class string_ref_traits_eq {
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public:
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string_ref_traits_eq ( charT ch ) : ch_(ch) {}
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bool operator () ( charT val ) const { return traits::eq ( ch_, val ); }
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charT ch_;
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};
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}
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template<typename charT, typename traits> class basic_string_ref;
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typedef basic_string_ref<char, std::char_traits<char> > string_ref;
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typedef basic_string_ref<wchar_t, std::char_traits<wchar_t> > wstring_ref;
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#ifndef BOOST_NO_CXX11_CHAR16_T
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typedef basic_string_ref<char16_t, std::char_traits<char16_t> > u16string_ref;
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#endif
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#ifndef BOOST_NO_CXX11_CHAR32_T
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typedef basic_string_ref<char32_t, std::char_traits<char32_t> > u32string_ref;
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#endif
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template<typename charT, typename traits>
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class basic_string_ref {
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public:
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// types
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typedef charT value_type;
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typedef const charT* pointer;
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typedef const charT& reference;
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typedef const charT& const_reference;
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typedef pointer const_iterator; // impl-defined
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typedef const_iterator iterator;
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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typedef const_reverse_iterator reverse_iterator;
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typedef std::size_t size_type;
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typedef ptrdiff_t difference_type;
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static BOOST_CONSTEXPR_OR_CONST size_type npos = size_type(-1);
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// construct/copy
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BOOST_CONSTEXPR basic_string_ref ()
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: ptr_(NULL), len_(0) {}
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BOOST_CONSTEXPR basic_string_ref (const basic_string_ref &rhs)
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: ptr_(rhs.ptr_), len_(rhs.len_) {}
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basic_string_ref& operator=(const basic_string_ref &rhs) {
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ptr_ = rhs.ptr_;
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len_ = rhs.len_;
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return *this;
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}
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basic_string_ref(const charT* str)
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: ptr_(str), len_(traits::length(str)) {}
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template<typename Allocator>
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basic_string_ref(const std::basic_string<charT, traits, Allocator>& str)
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: ptr_(str.data()), len_(str.length()) {}
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BOOST_CONSTEXPR basic_string_ref(const charT* str, size_type len)
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: ptr_(str), len_(len) {}
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#ifndef BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS
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template<typename Allocator>
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explicit operator std::basic_string<charT, traits, Allocator>() const {
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return std::basic_string<charT, traits, Allocator> ( ptr_, len_ );
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}
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#endif
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// iterators
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BOOST_CONSTEXPR const_iterator begin() const { return ptr_; }
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BOOST_CONSTEXPR const_iterator cbegin() const { return ptr_; }
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BOOST_CONSTEXPR const_iterator end() const { return ptr_ + len_; }
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BOOST_CONSTEXPR const_iterator cend() const { return ptr_ + len_; }
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const_reverse_iterator rbegin() const { return const_reverse_iterator (end()); }
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const_reverse_iterator crbegin() const { return const_reverse_iterator (end()); }
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const_reverse_iterator rend() const { return const_reverse_iterator (begin()); }
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const_reverse_iterator crend() const { return const_reverse_iterator (begin()); }
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// capacity
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BOOST_CONSTEXPR size_type size() const { return len_; }
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BOOST_CONSTEXPR size_type length() const { return len_; }
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BOOST_CONSTEXPR size_type max_size() const { return len_; }
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BOOST_CONSTEXPR bool empty() const { return len_ == 0; }
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// element access
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BOOST_CONSTEXPR const charT& operator[](size_type pos) const { return ptr_[pos]; }
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const charT& at(size_t pos) const {
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if ( pos >= len_ )
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throw std::out_of_range ( "boost::string_ref::at" );
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return ptr_[pos];
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}
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BOOST_CONSTEXPR const charT& front() const { return ptr_[0]; }
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BOOST_CONSTEXPR const charT& back() const { return ptr_[len_-1]; }
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BOOST_CONSTEXPR const charT* data() const { return ptr_; }
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// modifiers
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void clear() { len_ = 0; }
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void remove_prefix(size_type n) {
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if ( n > len_ )
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n = len_;
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ptr_ += n;
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len_ -= n;
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}
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void remove_suffix(size_type n) {
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if ( n > len_ )
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n = len_;
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len_ -= n;
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}
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// basic_string_ref string operations
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BOOST_CONSTEXPR
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basic_string_ref substr(size_type pos, size_type n=npos) const {
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#if BOOST_WORKAROUND(BOOST_MSVC, <= 1600)
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// Looks like msvc 8 and 9 have a codegen bug when one branch of
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// a conditional operator is a throw expression. -EAN 2012/12/04
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if ( pos > size()) throw std::out_of_range ( "string_ref::substr" );
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if ( n == npos || pos + n > size()) n = size () - pos;
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return basic_string_ref ( data() + pos, n );
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#else
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return pos > size() ? throw std::out_of_range ( "string_ref::substr" ) :
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basic_string_ref ( data() + pos, n == npos || pos + n > size() ? size() - pos : n );
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#endif
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}
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int compare(basic_string_ref x) const {
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int cmp = traits::compare ( ptr_, x.ptr_, (std::min)(len_, x.len_));
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return cmp != 0 ? cmp : ( len_ == x.len_ ? 0 : len_ < x.len_ ? -1 : 1 );
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}
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bool starts_with(charT c) const { return !empty() && traits::eq ( c, front()); }
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bool starts_with(basic_string_ref x) const {
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return len_ >= x.len_ && traits::compare ( ptr_, x.ptr_, x.len_ ) == 0;
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}
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bool ends_with(charT c) const { return !empty() && traits::eq ( c, back()); }
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bool ends_with(basic_string_ref x) const {
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return len_ >= x.len_ && traits::compare ( ptr_ + len_ - x.len_, x.ptr_, x.len_ ) == 0;
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}
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size_type find(basic_string_ref s) const {
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const_iterator iter = std::search ( this->cbegin (), this->cend (),
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s.cbegin (), s.cend (), traits::eq );
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return iter = this->cend () ? npos : std::distance ( this->cbegin (), iter );
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}
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size_type find(charT c) const {
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const_iterator iter = std::find_if ( this->cbegin (), this->cend (),
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detail::string_ref_traits_eq<charT, traits> ( c ));
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return iter == this->cend () ? npos : std::distance ( this->cbegin (), iter );
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}
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size_type rfind(basic_string_ref s) const {
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const_reverse_iterator iter = std::search ( this->crbegin (), this->crend (),
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s.crbegin (), s.crend (), traits::eq );
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return iter == this->crend () ? npos : reverse_distance ( this->crbegin (), iter );
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}
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size_type rfind(charT c) const {
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const_reverse_iterator iter = std::find_if ( this->crbegin (), this->crend (),
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detail::string_ref_traits_eq<charT, traits> ( c ));
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return iter == this->crend () ? npos : reverse_distance ( this->crbegin (), iter );
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}
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size_type find_first_of(charT c) const { return find (c); }
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size_type find_last_of (charT c) const { return rfind (c); }
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size_type find_first_of(basic_string_ref s) const {
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const_iterator iter = std::find_first_of
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( this->cbegin (), this->cend (), s.cbegin (), s.cend (), traits::eq );
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return iter == this->cend () ? npos : std::distance ( this->cbegin (), iter );
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}
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size_type find_last_of(basic_string_ref s) const {
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const_reverse_iterator iter = std::find_first_of
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( this->crbegin (), this->crend (), s.cbegin (), s.cend (), traits::eq );
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return iter == this->crend () ? npos : reverse_distance ( this->crbegin (), iter);
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}
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size_type find_first_not_of(basic_string_ref s) const {
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const_iterator iter = find_not_of ( this->cbegin (), this->cend (), s );
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return iter == this->cend () ? npos : std::distance ( this->cbegin (), iter );
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}
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size_type find_first_not_of(charT c) const {
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for ( const_iterator iter = this->cbegin (); iter != this->cend (); ++iter )
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if ( !traits::eq ( c, *iter ))
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return std::distance ( this->cbegin (), iter );
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return npos;
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}
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size_type find_last_not_of(basic_string_ref s) const {
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const_reverse_iterator iter = find_not_of ( this->crbegin (), this->crend (), s );
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return iter == this->crend () ? npos : reverse_distance ( this->crbegin (), iter );
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}
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size_type find_last_not_of(charT c) const {
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for ( const_reverse_iterator iter = this->crbegin (); iter != this->crend (); ++iter )
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if ( !traits::eq ( c, *iter ))
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return reverse_distance ( this->crbegin (), iter );
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return npos;
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}
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private:
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template <typename r_iter>
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size_type reverse_distance ( r_iter first, r_iter last ) const {
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return len_ - 1 - std::distance ( first, last );
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}
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template <typename Iterator>
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Iterator find_not_of ( Iterator first, Iterator last, basic_string_ref s ) const {
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for ( ; first != last ; ++first )
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if ( 0 == traits::find ( s.ptr_, s.len_, *first ))
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return first;
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return last;
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}
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const charT *ptr_;
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std::size_t len_;
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};
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// Comparison operators
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template<typename charT, typename traits>
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bool operator==(basic_string_ref<charT, traits> x, basic_string_ref<charT, traits> y) {
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if ( x.size () != y.size ()) return false;
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return x.compare(y) == 0;
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}
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template<typename charT, typename traits>
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bool operator!=(basic_string_ref<charT, traits> x, basic_string_ref<charT, traits> y) {
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if ( x.size () != y.size ()) return true;
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return x.compare(y) != 0;
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}
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template<typename charT, typename traits>
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bool operator<(basic_string_ref<charT, traits> x, basic_string_ref<charT, traits> y) {
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return x.compare(y) < 0;
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}
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template<typename charT, typename traits>
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bool operator>(basic_string_ref<charT, traits> x, basic_string_ref<charT, traits> y) {
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return x.compare(y) > 0;
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}
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template<typename charT, typename traits>
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bool operator<=(basic_string_ref<charT, traits> x, basic_string_ref<charT, traits> y) {
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return x.compare(y) <= 0;
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}
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template<typename charT, typename traits>
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bool operator>=(basic_string_ref<charT, traits> x, basic_string_ref<charT, traits> y) {
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return x.compare(y) >= 0;
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}
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// Inserter
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template<class charT, class traits>
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std::basic_ostream<charT, traits>&
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operator<<(std::basic_ostream<charT, traits>& os, const basic_string_ref<charT,traits>& str) {
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#ifdef BOOST_NO_CXX11_RANGE_BASED_FOR
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for ( typename basic_string_ref<charT, traits>::const_iterator iter = str.begin (); iter != str.end (); ++iter )
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os << *iter;
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#else
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for ( charT x : str )
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os << x;
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#endif
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return os;
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}
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#if 0
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// numeric conversions
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//
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// These are short-term implementations.
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// In a production environment, I would rather avoid the copying.
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//
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int stoi (string_ref str, size_t* idx=0, int base=10) {
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return std::stoi ( std::string(str), idx, base );
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}
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long stol (string_ref str, size_t* idx=0, int base=10) {
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return std::stol ( std::string(str), idx, base );
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}
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unsigned long stoul (string_ref str, size_t* idx=0, int base=10) {
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return std::stoul ( std::string(str), idx, base );
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}
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long long stoll (string_ref str, size_t* idx=0, int base=10) {
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return std::stoll ( std::string(str), idx, base );
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}
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unsigned long long stoull (string_ref str, size_t* idx=0, int base=10) {
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return std::stoull ( std::string(str), idx, base );
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}
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float stof (string_ref str, size_t* idx=0) {
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return std::stof ( std::string(str), idx );
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}
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double stod (string_ref str, size_t* idx=0) {
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return std::stod ( std::string(str), idx );
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}
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long double stold (string_ref str, size_t* idx=0) {
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return std::stold ( std::string(str), idx );
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}
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int stoi (wstring_ref str, size_t* idx=0, int base=10) {
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return std::stoi ( std::wstring(str), idx, base );
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}
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long stol (wstring_ref str, size_t* idx=0, int base=10) {
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return std::stol ( std::wstring(str), idx, base );
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}
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unsigned long stoul (wstring_ref str, size_t* idx=0, int base=10) {
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return std::stoul ( std::wstring(str), idx, base );
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}
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long long stoll (wstring_ref str, size_t* idx=0, int base=10) {
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return std::stoll ( std::wstring(str), idx, base );
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}
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unsigned long long stoull (wstring_ref str, size_t* idx=0, int base=10) {
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return std::stoull ( std::wstring(str), idx, base );
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}
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float stof (wstring_ref str, size_t* idx=0) {
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return std::stof ( std::wstring(str), idx );
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}
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double stod (wstring_ref str, size_t* idx=0) {
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return std::stod ( std::wstring(str), idx );
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}
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long double stold (wstring_ref str, size_t* idx=0) {
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return std::stold ( std::wstring(str), idx );
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}
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#endif
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}
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#if 0
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namespace std {
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// Hashing
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template<> struct hash<boost::string_ref>;
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template<> struct hash<boost::u16string_ref>;
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template<> struct hash<boost::u32string_ref>;
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template<> struct hash<boost::wstring_ref>;
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}
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#endif
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#endif
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