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Diffstat (limited to 'boost/spirit/home/x3/support/utility/error_reporting.hpp')
| -rw-r--r-- | boost/spirit/home/x3/support/utility/error_reporting.hpp | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/boost/spirit/home/x3/support/utility/error_reporting.hpp b/boost/spirit/home/x3/support/utility/error_reporting.hpp new file mode 100644 index 0000000000..9e65f2149b --- /dev/null +++ b/boost/spirit/home/x3/support/utility/error_reporting.hpp @@ -0,0 +1,241 @@ +/*============================================================================= + Copyright (c) 2014 Joel de Guzman + + Distributed under the Boost Software License, Version 1.0. (See accompanying + file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) +==============================================================================*/ +#if !defined(BOOST_SPIRIT_X3_ERROR_REPORTING_MAY_19_2014_00405PM) +#define BOOST_SPIRIT_X3_ERROR_REPORTING_MAY_19_2014_00405PM + +#include <boost/filesystem/path.hpp> +#include <boost/spirit/home/x3/support/ast/position_tagged.hpp> +#include <ostream> + +// Clang-style error handling utilities + +namespace boost { namespace spirit { namespace x3 +{ + template <typename Iterator> + class error_handler + { + public: + + typedef Iterator iterator_type; + + error_handler( + Iterator first, Iterator last, std::ostream& err_out + , std::string file = "", int tabs = 4) + : err_out(err_out) + , file(file) + , tabs(tabs) + , pos_cache(first, last) {} + + typedef void result_type; + + void operator()(Iterator err_pos, std::string const& error_message) const; + void operator()(Iterator err_first, Iterator err_last, std::string const& error_message) const; + void operator()(position_tagged pos, std::string const& message) const + { + auto where = pos_cache.position_of(pos); + (*this)( + where.begin() + , where.end() + , message + ); + } + + template <typename AST> + void tag(AST& ast, Iterator first, Iterator last) + { + return pos_cache.annotate(ast, first, last); + } +// +// void operator()( +// Iterator first +// , Iterator last +// , Iterator err_op +// , Iterator err_first +// , Iterator err_last +// , std::string const& error_message +// ) const; + + private: + + void print_file_line(std::size_t line) const; + void print_line(Iterator& line_start, Iterator last) const; + void print_indicator(Iterator& line_start, Iterator last, char ind) const; + void skip_whitespace(Iterator& err_pos, Iterator last) const; + void skip_non_whitespace(Iterator& err_pos, Iterator last) const; + Iterator get_line_start(Iterator first, Iterator pos) const; + std::size_t position(Iterator i) const; + + std::ostream& err_out; + std::string file; + int tabs; + position_cache<std::vector<Iterator>> pos_cache; + }; + + template <typename Iterator> + void error_handler<Iterator>::print_file_line(std::size_t line) const + { + namespace fs = boost::filesystem; + + if (file != "") + err_out << "In file " << fs::path(file).generic_string() << ", "; + else + err_out << "In "; + + err_out << "line " << line << ':' << std::endl; + } + + template <typename Iterator> + void error_handler<Iterator>::print_line(Iterator& start, Iterator last) const + { + for (; start != last; ++start) + { + auto c = *start; + if (c == '\r' || c == '\n') + break; + else + err_out << c; + } + err_out << std::endl; + } + + template <typename Iterator> + void error_handler<Iterator>::print_indicator(Iterator& start, Iterator last, char ind) const + { + for (; start != last; ++start) + { + auto c = *start; + if (c == '\r' || c == '\n') + break; + else if (c == '\t') + for (int i = 0; i < tabs; ++i) + err_out << ind; + else + err_out << ind; + } + } + + template <typename Iterator> + void error_handler<Iterator>::skip_whitespace(Iterator& err_pos, Iterator last) const + { + // make sure err_pos does not point to white space + while (err_pos != last) + { + char c = *err_pos; + if (std::isspace(c)) + ++err_pos; + else + break; + } + } + + template <typename Iterator> + void error_handler<Iterator>::skip_non_whitespace(Iterator& err_pos, Iterator last) const + { + // make sure err_pos does not point to white space + while (err_pos != last) + { + char c = *err_pos; + if (std::isspace(c)) + break; + else + ++err_pos; + } + } + + template <class Iterator> + inline Iterator error_handler<Iterator>::get_line_start(Iterator first, Iterator pos) const + { + Iterator latest = first; + for (Iterator i = first; i != pos; ++i) + if (*i == '\r' || *i == '\n') + latest = i; + return latest; + } + + template <typename Iterator> + std::size_t error_handler<Iterator>::position(Iterator i) const + { + // $$$ asumes iterator is similar to line_pos_iterator $$$ + return i.position(); + } + + template <typename Iterator> + void error_handler<Iterator>::operator()( + Iterator err_pos, std::string const& error_message) const + { + Iterator first = pos_cache.first(); + Iterator last = pos_cache.last(); + + // make sure err_pos does not point to white space + skip_whitespace(err_pos, last); + + print_file_line(position(err_pos)); + err_out << error_message << std::endl; + + Iterator start = get_line_start(first, err_pos); + if (start != first) + ++start; + Iterator i = start; + print_line(i, last); + print_indicator(start, err_pos, '_'); + err_out << "^_" << std::endl; + } + + template <typename Iterator> + void error_handler<Iterator>::operator()( + Iterator err_first, Iterator err_last, std::string const& error_message) const + { + Iterator first = pos_cache.first(); + Iterator last = pos_cache.last(); + + // make sure err_pos does not point to white space + skip_whitespace(err_first, last); + + print_file_line(position(err_first)); + err_out << error_message << std::endl; + + Iterator start = get_line_start(first, err_first); + if (start != first) + ++start; + Iterator i = start; + print_line(i, last); + print_indicator(start, err_first, ' '); + print_indicator(start, err_last, '~'); + err_out << " <<-- Here" << std::endl; + } +// +// template <typename Iterator> +// void error_handler<Iterator>::operator()( +// Iterator first +// , Iterator last +// , Iterator err_op +// , Iterator err_first +// , Iterator err_last +// , std::string const& error_message +// ) const +// { +// // make sure err_pos does not point to white space +// skip_whitespace(err_first, last); +// +// print_file_line(position(err_pos)); +// err_out << error_message << std::endl; +// +// Iterator start = get_line_start(first, err_first); +// if (start != first) +// ++start; +// Iterator i = start; +// print_line(i, last); +// print_indicator(start, err_first, ' '); +// print_indicator(start, err_op, '~'); +// err_out << '^'; +// print_indicator(++start, err_last, '~'); +// err_out << " <<-- Here" << std::endl; +// } + +}}} + +#endif |