Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 118 insertions, 0 deletions

diff --git a/src/boost/libs/spirit/example/lex/print_numbers.cpp b/src/boost/libs/spirit/example/lex/print_numbers.cpp
new file mode 100644
index 00000000..e128af97
--- /dev/null
+++ b/src/boost/libs/spirit/example/lex/print_numbers.cpp
@@ -0,0 +1,118 @@
+//  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 is the equivalent to the following lex program:
+//
+//     %{
+//     #include <stdio.h>
+//     %}
+//     %%
+//     [0-9]+   { printf("%s\n", yytext); }
+//     .|\n     ;
+//     %%
+//     main()
+//     {
+//             yylex();
+//     }
+//
+//  Its purpose is to print all the (integer) numbers found in a file
+
+#include <boost/config/warning_disable.hpp>
+#include <boost/spirit/include/qi.hpp>
+#include <boost/spirit/include/lex_lexertl.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>
+
+#include <iostream>
+#include <string>
+
+#include "example.hpp"
+
+using namespace boost::spirit;
+
+///////////////////////////////////////////////////////////////////////////////
+//  Token definition: We use the lexertl based lexer engine as the underlying 
+//                    lexer type.
+///////////////////////////////////////////////////////////////////////////////
+template <typename Lexer>
+struct print_numbers_tokens : lex::lexer<Lexer>
+{
+    // define tokens and associate it with the lexer, we set the lexer flags
+    // not to match newlines while matching a dot, so we need to add the
+    // '\n' explicitly below
+    print_numbers_tokens()
+      : print_numbers_tokens::base_type(lex::match_flags::match_not_dot_newline)
+    {
+        this->self = lex::token_def<int>("[0-9]+") | ".|\n";
+    }
+};
+
+///////////////////////////////////////////////////////////////////////////////
+//  Grammar definition
+///////////////////////////////////////////////////////////////////////////////
+template <typename Iterator>
+struct print_numbers_grammar : qi::grammar<Iterator>
+{
+    print_numbers_grammar()
+      : print_numbers_grammar::base_type(start)
+    {
+        // we just know, that the token ids get assigned starting min_token_id
+        // so, "[0-9]+" gets the id 'min_token_id' and ".|\n" gets the id
+        // 'min_token_id+1'.
+        start =  *(   qi::token(lex::min_token_id)  [ std::cout << _1  << "\n" ] 
+                  |   qi::token(lex::min_token_id+1)
+                  )
+              ;
+    }
+
+    qi::rule<Iterator> start;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+int main(int argc, char* argv[])
+{
+    // iterator type used to expose the underlying input stream
+    typedef std::string::iterator base_iterator_type;
+
+    // the token type to be used, 'int' is available as the type of the token 
+    // attribute and no lexer state is supported
+    typedef lex::lexertl::token<base_iterator_type, boost::mpl::vector<int>
+      , boost::mpl::false_> token_type;
+
+    // lexer type
+    typedef lex::lexertl::lexer<token_type> lexer_type;
+
+    // iterator type exposed by the lexer 
+    typedef print_numbers_tokens<lexer_type>::iterator_type iterator_type;
+
+    // now we use the types defined above to create the lexer and grammar
+    // object instances needed to invoke the parsing process
+    print_numbers_tokens<lexer_type> print_tokens;    // Our lexer
+    print_numbers_grammar<iterator_type> print;       // Our parser 
+
+    // Parsing is done based on the token stream, not the character 
+    // stream read from the input.
+    std::string str (read_from_file(1 == argc ? "print_numbers.input" : argv[1]));
+    base_iterator_type first = str.begin();
+    bool r = lex::tokenize_and_parse(first, str.end(), print_tokens, print);
+
+    if (r) {
+        std::cout << "-------------------------\n";
+        std::cout << "Parsing succeeded\n";
+        std::cout << "-------------------------\n";
+    }
+    else {
+        std::string rest(first, str.end());
+        std::cout << "-------------------------\n";
+        std::cout << "Parsing failed\n";
+        std::cout << "stopped at: \"" << rest << "\"\n";
+        std::cout << "-------------------------\n";
+    }
+
+    std::cout << "Bye... :-) \n\n";
+    return 0;
+}
+
+
+