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- /*=============================================================================
- Copyright (c) 2002 Juan Carlos Arevalo-Baeza
- http://spirit.sourceforge.net/
- Use, modification and distribution is subject to 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)
- =============================================================================*/
- ///////////////////////////////////////////////////////////////////////////////
- //
- // A parser for a comma separated list of numbers,
- // with positional error reporting
- // See the "Position Iterator" chapter in the User's Guide.
- //
- // [ JCAB 9/28/2002 ]
- //
- ///////////////////////////////////////////////////////////////////////////////
- #include <boost/spirit/include/classic_core.hpp>
- #include <boost/spirit/include/classic_position_iterator.hpp>
- #include <boost/spirit/include/classic_functor_parser.hpp>
- #include <iostream>
- #include <fstream>
- #include <vector>
- ///////////////////////////////////////////////////////////////////////////////
- using namespace std;
- using namespace BOOST_SPIRIT_CLASSIC_NS;
- ///////////////////////////////////////////////////////////////////////////////
- //
- // Our error reporting parsers
- //
- ///////////////////////////////////////////////////////////////////////////////
- std::ostream& operator<<(std::ostream& out, file_position const& lc)
- {
- return out <<
- "\nFile:\t" << lc.file <<
- "\nLine:\t" << lc.line <<
- "\nCol:\t" << lc.column << endl;
- }
- struct error_report_parser {
- char const* eol_msg;
- char const* msg;
- error_report_parser(char const* eol_msg_, char const* msg_):
- eol_msg(eol_msg_),
- msg (msg_)
- {}
- typedef nil_t result_t;
- template <typename ScannerT>
- int
- operator()(ScannerT const& scan, result_t& /*result*/) const
- {
- if (scan.at_end()) {
- if (eol_msg) {
- file_position fpos = scan.first.get_position();
- cerr << fpos << eol_msg << endl;
- }
- } else {
- if (msg) {
- file_position fpos = scan.first.get_position();
- cerr << fpos << msg << endl;
- }
- }
- return -1; // Fail.
- }
- };
- typedef functor_parser<error_report_parser> error_report_p;
- error_report_p
- error_badnumber_or_eol =
- error_report_parser(
- "Expecting a number, but found the end of the file\n",
- "Expecting a number, but found something else\n"
- );
- error_report_p
- error_badnumber =
- error_report_parser(
- 0,
- "Expecting a number, but found something else\n"
- );
- error_report_p
- error_comma =
- error_report_parser(
- 0,
- "Expecting a comma, but found something else\n"
- );
- ///////////////////////////////////////////////////////////////////////////////
- //
- // Our comma separated list parser
- //
- ///////////////////////////////////////////////////////////////////////////////
- bool
- parse_numbers(char const* filename, char const* str, vector<double>& v)
- {
- typedef position_iterator<char const*> iterator_t;
- iterator_t begin(str, str + strlen(str), filename);
- iterator_t end;
- begin.set_tabchars(8);
- return parse(begin, end,
- // Begin grammar
- (
- (real_p[push_back_a(v)] | error_badnumber)
- >> *(
- (',' | error_comma)
- >> (real_p[push_back_a(v)] | error_badnumber_or_eol)
- )
- )
- ,
- // End grammar
- space_p).full;
- }
- ////////////////////////////////////////////////////////////////////////////
- //
- // Main program
- //
- ////////////////////////////////////////////////////////////////////////////
- int
- main(int argc, char **argv)
- {
- cout << "/////////////////////////////////////////////////////////\n\n";
- cout << "\tAn error-reporting parser for Spirit...\n\n";
- cout << "Parses a comma separated list of numbers from a file.\n";
- cout << "The numbers will be inserted in a vector of numbers\n\n";
- cout << "/////////////////////////////////////////////////////////\n\n";
- char str[65536];
- char const* filename;
- if (argc > 1) {
- filename = argv[1];
- ifstream file(filename);
- file.get(str, sizeof(str), '\0');
- } else {
- filename = "<cin>";
- cin.get(str, sizeof(str), '\0');
- }
- vector<double> v;
- if (parse_numbers(filename, str, v))
- {
- cout << "-------------------------\n";
- cout << "Parsing succeeded\n";
- cout << str << " Parses OK: " << endl;
- for (vector<double>::size_type i = 0; i < v.size(); ++i)
- cout << i << ": " << v[i] << endl;
- cout << "-------------------------\n";
- }
- else
- {
- cout << "-------------------------\n";
- cout << "Parsing failed\n";
- cout << "-------------------------\n";
- }
- cout << "Bye... :-) \n\n";
- return 0;
- }
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