[Boost-commit] svn:boost r54351 - trunk/libs/spirit/example/karma

Subject: [Boost-commit] svn:boost r54351 - trunk/libs/spirit/example/karma
From: hartmut.kaiser_at_[hidden]
Date: 2009-06-25 15:14:59

Author: hkaiser
Date: 2009-06-25 15:14:58 EDT (Thu, 25 Jun 2009)
New Revision: 54351
URL: http://svn.boost.org/trac/boost/changeset/54351

Log:
Spirit: Added a new Karma example
Added:
   trunk/libs/spirit/example/karma/num_list1.cpp   (contents, props changed)
Text files modified: 
   trunk/libs/spirit/example/karma/Jamfile |     1 +                                       
   1 files changed, 1 insertions(+), 0 deletions(-)

Modified: trunk/libs/spirit/example/karma/Jamfile
==============================================================================
--- trunk/libs/spirit/example/karma/Jamfile	(original)
+++ trunk/libs/spirit/example/karma/Jamfile	2009-06-25 15:14:58 EDT (Thu, 25 Jun 2009)
@@ -8,6 +8,7 @@
 project spirit-karma-example ;
 
 exe quick_start1       : quick_start1.cpp ;
+exe num_list1          : num_list1.cpp ;
 exe actions_example    : actions.cpp ;
 exe basic_facilities   : basic_facilities.cpp /boost//date_time ;
 exe calc2_ast_dump     : calc2_ast_dump.cpp ;

Added: trunk/libs/spirit/example/karma/num_list1.cpp
==============================================================================
--- (empty file)
+++ trunk/libs/spirit/example/karma/num_list1.cpp	2009-06-25 15:14:58 EDT (Thu, 25 Jun 2009)
@@ -0,0 +1,121 @@
+/*=============================================================================
+    Copyright (c) 2002-2009 Joel Hartmut Kaiser
+    Copyright (c) 2002-2009 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)
+=============================================================================*/
+///////////////////////////////////////////////////////////////////////////////
+//
+//  This sample demonstrates a generator for a comma separated list of numbers.
+//  No actions. It is based on the example qi/num_lists.cpp for reading in
+//  some numbers to generate.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include <boost/config/warning_disable.hpp>
+#include <boost/spirit/include/qi.hpp>
+#include <boost/spirit/include/karma.hpp>
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+namespace client
+{
+    namespace qi = boost::spirit::qi;
+    namespace karma = boost::spirit::karma;
+    namespace ascii = boost::spirit::ascii;
+
+    ///////////////////////////////////////////////////////////////////////////
+    //  Our number list parser, please see the example qi/numlist1.cpp for
+    //  more information
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Iterator>
+    bool parse_numbers(Iterator first, Iterator last, std::vector<double>& v)
+    {
+        using qi::double_;
+        using qi::phrase_parse;
+        using ascii::space;
+
+        bool r = phrase_parse(first, last, double_ >> *(',' >> double_), space, v);
+        if (first != last)
+            return false;
+        return r;
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    //  Our number list generator
+    ///////////////////////////////////////////////////////////////////////////
+    //[tutorial_karma_numlist1
+    template <typename OutputIterator>
+    bool generate_numbers(OutputIterator sink, std::vector<double> const& v)
+    {
+        using karma::double_;
+        using karma::generate_delimited;
+        using ascii::space;
+
+        bool r = generate_delimited(
+            sink,                           /*< destination: output iterator >*/
+            double_ << *(',' << double_),   /*< the generator >*/
+            space,                          /*< the delimiter-generator >*/
+            v                               /*< the data to output >*/
+        );
+        return r;
+    }
+    //]
+}
+
+////////////////////////////////////////////////////////////////////////////
+//  Main program
+////////////////////////////////////////////////////////////////////////////
+int
+main()
+{
+    std::cout << "/////////////////////////////////////////////////////////\n\n";
+    std::cout << "\t\tA comma separated list generator for Spirit...\n\n";
+    std::cout << "/////////////////////////////////////////////////////////\n\n";
+
+    std::cout << "Give me a comma separated list of numbers.\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;
+
+        std::vector<double> v;      // here we put the data to generate
+        if (client::parse_numbers(str.begin(), str.end(), v))
+        {
+            // ok, we got some numbers, no print them back out
+            std::cout << "-------------------------\n";
+
+            std::string generated;
+            std::back_insert_iterator<std::string> sink(generated);
+            if (!client::generate_numbers(sink, v))
+            {
+                std::cout << "-------------------------\n";
+                std::cout << "Generating failed\n";
+                std::cout << "-------------------------\n";
+            }
+            else
+            {
+                std::cout << "-------------------------\n";
+                std::cout << "Generated: " << generated << "\n";
+                std::cout << "-------------------------\n";
+            }
+        }
+        else
+        {
+            std::cout << "-------------------------\n";
+            std::cout << "Parsing failed\n";
+            std::cout << "-------------------------\n";
+        }
+    }
+
+    std::cout << "Bye... :-) \n\n";
+    return 0;
+}
+
+