[Boost-commit] svn:boost r65056 - trunk/libs/spirit/example/qi

Subject: [Boost-commit] svn:boost r65056 - trunk/libs/spirit/example/qi
From: hartmut.kaiser_at_[hidden]
Date: 2010-08-27 14:02:34

Author: hkaiser
Date: 2010-08-27 14:02:34 EDT (Fri, 27 Aug 2010)
New Revision: 65056
URL: http://svn.boost.org/trac/boost/changeset/65056

Log:
Spirit: adding example showing how to parse into a QString
Added:
   trunk/libs/spirit/example/qi/custom_string.cpp   (contents, props changed)

Added: trunk/libs/spirit/example/qi/custom_string.cpp
==============================================================================
--- (empty file)
+++ trunk/libs/spirit/example/qi/custom_string.cpp	2010-08-27 14:02:34 EDT (Fri, 27 Aug 2010)
@@ -0,0 +1,93 @@
+//  Copyright (c) 2001-2010 Hartmut Kaiser
+// 
+//  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)
+
+//  This example demonstrates the steps needed to integrate a custom container
+//  type to be usable with Spirit.Qi. It shows how to utilize the QString data
+//  type as a Qi attribute.
+
+//  Note: you need to have Qt4 installed on your system and you have to make 
+//        sure your compiler finds the includes and your linker finds the 
+//        proper libraries.
+
+#include <boost/config/warning_disable.hpp>
+#include <boost/spirit/include/qi.hpp>
+
+#include <Qt/qstring.h>
+
+namespace boost { namespace spirit { namespace traits
+{
+    // make Qi recognize QString as a container
+    template <> struct is_container<QString> : mpl::true_ {};
+
+    // Expose QStrings value_type
+    template <> struct container_value<QString> : mpl::identity<QChar> {};
+
+    // Define, how to insert a new element at the end of the container
+    template <>
+    struct push_back_container<QString, QChar>
+    {
+        static bool call(QString& c, QChar const& val)
+        {
+            c.append(val);
+            return true;
+        }
+    };
+}}}
+
+///////////////////////////////////////////////////////////////////////////////
+namespace client
+{
+    template <typename Iterator>
+    bool parse_qstring(Iterator first, Iterator last, QString& t)
+    {
+        using boost::spirit::qi::char_;
+        using boost::spirit::ascii::space;
+        using boost::spirit::qi::phrase_parse;
+
+        bool r = phrase_parse(first, last, +char_, space, t);
+        if (!r || first != last) // fail if we did not get a full match
+            return false;
+
+        return r;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+int main()
+{
+    std::cout << "/////////////////////////////////////////////////////////\n\n";
+    std::cout << "\t\tParsing into a QString from Spirit...\n\n";
+    std::cout << "/////////////////////////////////////////////////////////\n\n";
+
+    std::cout << "Give me a complex number of the form r or (r) or (r,i) \n";
+    std::cout << "Type [q or Q] to quit\n\n";
+
+    std::string str;
+    while (getline(std::cin, str))
+    {
+        if (str.empty() || str[0] == 'q' || str[0] == 'Q')
+            break;
+
+        QString t;
+        if (client::parse_qstring(str.begin(), str.end(), t))
+        {
+            std::cout << "-------------------------\n";
+            std::cout << "Parsing succeeded\n";
+            std::cout << "got: " << t.toStdString() << std::endl;
+            std::cout << "\n-------------------------\n";
+        }
+        else
+        {
+            std::cout << "-------------------------\n";
+            std::cout << "Parsing failed\n";
+            std::cout << "-------------------------\n";
+        }
+    }
+
+    std::cout << "Bye... :-) \n\n";
+    return 0;
+}
+
+