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istream.hpp Go to the documentation of this file. /* Copyright 2005-2007 Adobe Systems Incorporated Distributed under the MIT License (see accompanying file LICENSE_1_0_0.txt or a copy at http://stlab.adobe.com/licenses.html) */ /*************************************************************************************************/ #ifndef ADOBE_ISTREAM_HPP #define ADOBE_ISTREAM_HPP #include <adobe/config.hpp> #include <ios> #include <istream> #include <stdexcept> #include <vector> #include <adobe/name_fwd.hpp> #include <adobe/istream_fwd.hpp> #include <boost/any.hpp> #include <boost/shared_ptr.hpp> #include <boost/function.hpp> /*************************************************************************************************/ namespace adobe { /*************************************************************************************************/ #if 0 std::istream& getline(std::istream& is, std::string& str); #endif /*************************************************************************************************/ //***************************************************************************// //***************************************************************************// //***************************************************************************// //***************************************************************************// //***************************************************************************// //***************************************************************************// // line_position_t is used to remember a position on a particular line of a file. struct line_position_t { public: typedef boost::function<std::string (name_t, std::streampos)> getline_proc_impl_t; typedef boost::shared_ptr<getline_proc_impl_t> getline_proc_t; // line_number starts at 1. line_position_t( name_t file_path, getline_proc_t getline_proc, int line_number = 1, std::streampos line_start = 0, std::streampos position = -1); // This constructor is used with __FILE__ and __LINE__, line_index starts at 0 explicit line_position_t(const char*, int line_index = 0); #if !defined(ADOBE_NO_DOCUMENTATION) line_position_t(); #endif // !defined(ADOBE_NO_DOCUMENTATION) const char* stream_name() const { return file_name_m.c_str(); } std::string file_snippet() const { return getline_proc_m ? (*getline_proc_m)(file_name_m, line_start_m) : std::string(); } int line_number_m; // type int to match __LINE__ token std::streampos line_start_m; std::streampos position_m; #if !defined(ADOBE_NO_DOCUMENTATION) private: name_t file_name_m; getline_proc_t getline_proc_m; #endif // !defined(ADOBE_NO_DOCUMENTATION) }; /*************************************************************************************************/ std::ostream& operator<<(std::ostream&, const line_position_t&); /*************************************************************************************************/ class stream_error_t : public std::logic_error { public: typedef std::vector<line_position_t> position_set_t; stream_error_t(const std::exception& base, const line_position_t& position) : std::logic_error(base.what()) { try { const stream_error_t* error = dynamic_cast<const stream_error_t*>(&base); if (error) line_position_set_m = error->line_position_set_m; line_position_set_m.push_back(position); } catch (...) { } } stream_error_t(const char* what, const line_position_t& position) : std::logic_error(what), line_position_set_m(1, position) { } stream_error_t(const std::string& what, const line_position_t& position) : std::logic_error(what), line_position_set_m(1, position) { } const position_set_t& line_position_set() const { return line_position_set_m; } #if !defined(ADOBE_NO_DOCUMENTATION) ~stream_error_t() throw() { } private: position_set_t line_position_set_m; #endif // !defined(ADOBE_NO_DOCUMENTATION) }; /*************************************************************************************************/ /* REVISIT (sparent) : I'm not certain this code is correct when used with an istream iterator which might do line ending conversions with operator <<. Read up on this. */ /* REVISIT (sparent) : The interface to is_line_end should take an iterator pair and return a pair (first, bool) - not work on a reference to first. */ template <typename I> // I models InputIterator bool is_line_end(I& first, I last) { // Handle any type of line ending. typename std::iterator_traits<I>::value_type c(*first); if (c != '\n' && c != '\r') return false; ++first; if (c == '\r' && first != last && *first == '\n') ++first; return true; } /*************************************************************************************************/ template <typename I> // I models InputIterator std::size_t is_line_end(I& first, I last, char c) { // Handle any type of line ending. if (c == '\n') return 1; if (c == '\r') { if (first != last && *first == '\n') { ++first; return 2; } return 1; } return 0; } /*************************************************************************************************/ template <typename I> // I models InputIterator std::pair<I, std::string> get_line(I first, I last) { std::string result; while (first != last && !is_line_end(first, last)) { result.append(1, *first); ++ first; } return std::make_pair(first, result); } /*************************************************************************************************/ } // namespace adobe /*************************************************************************************************/ #endif /*************************************************************************************************/

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