0d4d2c1f6c
Improve QString integration in custom_string.cpp There is an example of how to use Qi with Qt's QString as a custom string. This is very helpful but it doesn't work in conjunction with the debug facilities. The following patch fixes this by adding a couple of template specialisations. Patch originally submitted as https://svn.boost.org/trac/boost/ticket/8846
114 lines
3.4 KiB
C++
114 lines
3.4 KiB
C++
// Copyright (c) 2001-2010 Hartmut Kaiser
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//
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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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// This example demonstrates the steps needed to integrate a custom container
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// type to be usable with Spirit.Qi. It shows how to utilize the QString data
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// type as a Qi attribute.
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// Note: you need to have Qt4 installed on your system and you have to make
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// sure your compiler finds the includes and your linker finds the
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// proper libraries.
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#include <boost/config/warning_disable.hpp>
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#include <boost/spirit/include/qi.hpp>
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#include <Qt/qstring.h>
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namespace boost { namespace spirit { namespace traits
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{
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// Make Qi recognize QString as a container
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template <> struct is_container<QString> : mpl::true_ {};
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// Expose the container's (QString's) value_type
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template <> struct container_value<QString> : mpl::identity<QChar> {};
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// Define how to insert a new element at the end of the container (QString)
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template <>
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struct push_back_container<QString, QChar>
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{
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static bool call(QString& c, QChar const& val)
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{
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c.append(val);
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return true;
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}
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};
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// Test if a QString is empty (required for debug)
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template <>
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struct is_empty_container<QString>
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{
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static bool call(QString const& c)
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{
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return c.isEmpty();
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}
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};
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// Define how to stream a QString (required for debug)
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template <typename Out, typename Enable>
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struct print_attribute_debug<Out, QString, Enable>
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{
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static void call(Out& out, QString const& val)
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{
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out << val.toStdString();
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}
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};
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}}}
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///////////////////////////////////////////////////////////////////////////////
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namespace client
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{
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template <typename Iterator>
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bool parse_qstring(Iterator first, Iterator last, QString& t)
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{
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using boost::spirit::qi::char_;
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using boost::spirit::ascii::space;
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using boost::spirit::qi::phrase_parse;
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bool r = phrase_parse(first, last, +char_, space, t);
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if (!r || first != last) // fail if we did not get a full match
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return false;
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return r;
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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int main()
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{
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "\t\tParsing into a QString from Spirit...\n\n";
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "Give me a complex number of the form r or (r) or (r,i) \n";
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std::cout << "Type [q or Q] to quit\n\n";
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std::string str;
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while (getline(std::cin, str))
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{
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if (str.empty() || str[0] == 'q' || str[0] == 'Q')
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break;
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QString t;
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if (client::parse_qstring(str.begin(), str.end(), t))
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{
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std::cout << "-------------------------\n";
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std::cout << "Parsing succeeded\n";
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std::cout << "got: " << t.toStdString() << std::endl;
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std::cout << "\n-------------------------\n";
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}
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else
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{
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std::cout << "-------------------------\n";
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std::cout << "Parsing failed\n";
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std::cout << "-------------------------\n";
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}
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}
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std::cout << "Bye... :-) \n\n";
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return 0;
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}
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