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Boost.Log merged to trunk.
[SVN r83860]
This commit is contained in:
Andrey Semashev
153
src/format_parser.cpp
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153
src/format_parser.cpp
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/*
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* Copyright Andrey Semashev 2007 - 2013.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file format_parser.cpp
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* \author Andrey Semashev
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* \date 16.11.2012
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*
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* \brief This header is the Boost.Log library implementation, see the library documentation
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* at http://www.boost.org/libs/log/doc/log.html.
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*/
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#include <string>
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#include <algorithm>
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#include <boost/throw_exception.hpp>
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#include <boost/exception/exception.hpp>
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#include <boost/move/core.hpp>
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#include <boost/move/utility.hpp>
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#include <boost/spirit/include/qi_uint.hpp>
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#include <boost/spirit/include/qi_parse.hpp>
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#include <boost/log/detail/format.hpp>
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#include <boost/log/exceptions.hpp>
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#include <boost/log/support/exception.hpp>
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#include "spirit_encoding.hpp"
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#include <boost/log/detail/header.hpp>
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namespace qi = boost::spirit::qi;
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace aux {
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template< typename CharT >
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format_description< CharT > parse_format(const CharT* begin, const CharT* end)
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{
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typedef CharT char_type;
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typedef format_description< char_type > description;
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typedef typename encoding< char_type >::type traits;
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const char_type* original_begin = begin;
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description descr;
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unsigned int literal_start_pos = 0;
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while (begin != end)
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{
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const char_type* p = std::find(begin, end, static_cast< char_type >('%'));
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descr.literal_chars.append(begin, p);
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if ((end - p) >= 2)
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{
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// Check for a percent placeholder
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char_type c = p[1];
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if (c == static_cast< char_type >('%'))
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{
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descr.literal_chars.push_back(static_cast< char_type >('%'));
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begin = p + 2;
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continue;
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}
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// From here on, no more literals are possible. Append the literal element.
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{
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const unsigned int literal_chars_size = static_cast< unsigned int >(descr.literal_chars.size());
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if (literal_start_pos < literal_chars_size)
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{
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descr.format_elements.push_back(format_element::literal(literal_start_pos, literal_chars_size - literal_start_pos));
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literal_start_pos = literal_chars_size;
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}
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}
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// Check if this is a positional argument
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if (traits::isdigit(c))
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{
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if (c != static_cast< char_type >('0'))
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{
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// Positional argument in the form "%N%"
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unsigned int n = 0;
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const char_type* pp = p + 1;
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qi::parse(pp, end, qi::uint_, n);
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if (n == 0 || pp == end || *pp != static_cast< char_type >('%'))
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{
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boost::throw_exception(boost::enable_error_info(parse_error("Invalid positional format placeholder")) << boost::throw_file(__FILE__) << boost::throw_line(__LINE__)
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<< boost::log::position_info(static_cast< unsigned int >(p - original_begin))
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);
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}
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// Safety check against ridiculously large argument numbers which would lead to excessive memory consumption.
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// This could be useful if the format string is gathered from an external source (e.g. a config file).
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if (n > 1000)
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{
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boost::throw_exception(boost::enable_error_info(limitation_error("Positional format placeholder too big")) << boost::throw_file(__FILE__) << boost::throw_line(__LINE__)
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<< boost::log::position_info(static_cast< unsigned int >(p - original_begin))
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);
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}
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// We count positional arguments from 0, not from 1 as in format strings
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descr.format_elements.push_back(format_element::positional_argument(n - 1));
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begin = pp + 1; // skip the closing '%'
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continue;
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}
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else
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{
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// This must be the filler character, not supported yet
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}
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}
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// This must be something else, not supported yet
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boost::throw_exception(boost::enable_error_info(parse_error("Unsupported format placeholder")) << boost::throw_file(__FILE__) << boost::throw_line(__LINE__)
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<< boost::log::position_info(static_cast< unsigned int >(p - original_begin))
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);
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}
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else
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{
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if (p != end)
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descr.literal_chars.push_back(static_cast< char_type >('%')); // a single '%' character at the end of the string
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begin = end;
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}
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}
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const unsigned int literal_chars_size = static_cast< unsigned int >(descr.literal_chars.size());
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if (literal_start_pos < literal_chars_size)
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descr.format_elements.push_back(format_element::literal(literal_start_pos, literal_chars_size - literal_start_pos));
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return boost::move(descr);
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}
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#ifdef BOOST_LOG_USE_CHAR
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template BOOST_LOG_API
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format_description< char > parse_format(const char* begin, const char* end);
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#endif // BOOST_LOG_USE_CHAR
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#ifdef BOOST_LOG_USE_WCHAR_T
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template BOOST_LOG_API
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format_description< wchar_t > parse_format(const wchar_t* begin, const wchar_t* end);
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#endif // BOOST_LOG_USE_WCHAR_T
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} // namespace aux
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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