[Boost-commit] svn:boost r57721 - trunk/libs/spirit/example/qi

Subject: [Boost-commit] svn:boost r57721 - trunk/libs/spirit/example/qi
From: joel_at_[hidden]
Date: 2009-11-17 05:57:12

Author: djowel
Date: 2009-11-17 05:57:11 EST (Tue, 17 Nov 2009)
New Revision: 57721
URL: http://svn.boost.org/trac/boost/changeset/57721

Log:
Added Nabialek Trick Example
Added:
   trunk/libs/spirit/example/qi/nabialek.cpp   (contents, props changed)

Added: trunk/libs/spirit/example/qi/nabialek.cpp
==============================================================================
--- (empty file)
+++ trunk/libs/spirit/example/qi/nabialek.cpp	2009-11-17 05:57:11 EST (Tue, 17 Nov 2009)
@@ -0,0 +1,96 @@
+/*=============================================================================
+    Copyright (c) 2003 Sam Nabialek
+    Copyright (c) 2001-2009 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)
+=============================================================================*/
+///////////////////////////////////////////////////////////////////////////////
+//
+//  The Nabialek trick.
+//
+//  [ Sam Nabialek; Somewhere, sometime in 2003... ]    spirit1
+//  [ JDG November 17, 2009 ]                           spirit2
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include <boost/config/warning_disable.hpp>
+#include <boost/spirit/include/qi.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>
+#include <iostream>
+#include <string>
+
+namespace client
+{
+    namespace qi = boost::spirit::qi;
+    namespace ascii = boost::spirit::ascii;
+
+    ///////////////////////////////////////////////////////////////////////////////
+    //  Our nabialek_trick grammar
+    ///////////////////////////////////////////////////////////////////////////////
+    template <typename Iterator>
+    struct nabialek_trick : qi::grammar<
+        Iterator, ascii::space_type, qi::locals<qi::rule<Iterator, ascii::space_type> > >
+    {
+        nabialek_trick() : nabialek_trick::base_type(start)
+        {
+            using ascii::alnum;
+            using qi::lexeme;
+            using qi::lazy;
+            using qi::_a;
+            using qi::_1;
+
+            id = lexeme[*(ascii::alnum | '_')];
+            one = id;
+            two = id >> ',' >> id;
+
+            keyword.add
+                ("one", one)
+                ("two", two)
+                ;
+            
+            start = *(keyword[_a = _1] >> lazy(_a));
+        }
+
+        qi::rule<Iterator, ascii::space_type> id, one, two;
+        qi::rule<Iterator, ascii::space_type, qi::locals<qi::rule<Iterator, ascii::space_type> > > start;
+        qi::symbols<char, qi::rule<Iterator, ascii::space_type> > keyword;
+    };
+}
+
+///////////////////////////////////////////////////////////////////////////////
+//  Main program
+///////////////////////////////////////////////////////////////////////////////
+int
+main()
+{
+    using boost::spirit::ascii::space;
+    typedef std::string::const_iterator iterator_type;
+    typedef client::nabialek_trick<iterator_type> nabialek_trick;
+
+    nabialek_trick g; // Our grammar
+
+    std::string str = "one only\none again\ntwo first,second";
+    std::string::const_iterator iter = str.begin();
+    std::string::const_iterator end = str.end();
+    bool r = phrase_parse(iter, end, g, space);
+
+    if (r && iter == end)
+    {
+        std::cout << "-------------------------\n";
+        std::cout << "Parsing succeeded\n";
+        std::cout << "-------------------------\n";
+    }
+    else
+    {
+        std::string rest(iter, end);
+        std::cout << "-------------------------\n";
+        std::cout << "Parsing failed\n";
+        std::cout << "stopped at: \": " << rest << "\"\n";
+        std::cout << "-------------------------\n";
+    }
+
+    return 0;
+}
+
+