Update of /cvsroot/boost/boost/boost/xpressive
In directory sc8-pr-cvs3.sourceforge.net:/tmp/cvs-serv30288
Modified Files:
regex_primitives.hpp
Log Message:
add checker<>, check and wcheck for grammar-checking static regular expressions
Index: regex_primitives.hpp
===================================================================
RCS file: /cvsroot/boost/boost/boost/xpressive/regex_primitives.hpp,v
retrieving revision 1.16
retrieving revision 1.17
diff -u -d -r1.16 -r1.17
--- regex_primitives.hpp 13 Nov 2006 15:53:45 -0000 1.16
+++ regex_primitives.hpp 5 Dec 2006 05:31:34 -0000 1.17
@@ -10,6 +10,7 @@
#define BOOST_XPRESSIVE_REGEX_PRIMITIVES_HPP_EAN_10_04_2005
#include <climits>
+#include <boost/mpl/if.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/xpressive/proto/proto.hpp>
@@ -19,6 +20,7 @@
#include <boost/xpressive/detail/core/matchers.hpp>
#include <boost/xpressive/detail/static/as_xpr.hpp>
#include <boost/xpressive/detail/static/compile.hpp>
+#include <boost/xpressive/detail/static/grammar.hpp>
#include <boost/xpressive/detail/static/modifier.hpp>
#include <boost/xpressive/detail/utility/ignore_unused.hpp>
#include <boost/xpressive/detail/static/regex_operators.hpp>
@@ -627,6 +629,74 @@
return mod;
}
+///////////////////////////////////////////////////////////////////////////////
+/// \brief For checking if an expression matches xpressive's grammar
+///
+/// checker\<\> can be used to see if a given expression is a valid
+/// xpressive regular expression. If it is, it will simply return it.
+/// If it isn't, it will cause a simple and short compile-time error.
+/// You may use it as follows:
+/// checker\<char\> check;
+/// sregex rx = check( _ << "oops" );
+///
+/// See also xpressive::check and xpressive::wcheck.
+///
+/// \param Char The character type of the regular expression.
+template<typename Char>
+struct checker
+{
+private:
+ struct some_valid_expression
+ : proto::extends<typename proto::meta::terminal<Char>::type>
+ {
+ template<typename Xpr>
+ some_valid_expression(Xpr const &);
+ };
+
+ struct expression_does_not_match_xpressive_grammar
+ : mpl::false_
+ {};
+
+public:
+ template<typename Xpr>
+ typename mpl::if_
+ <
+ proto::matches<Xpr, XpressiveGrammar<Char> >
+ , Xpr const &
+ , some_valid_expression
+ >::type operator ()(Xpr const &xpr) const
+ {
+ typedef typename mpl::if_
+ <
+ proto::matches<Xpr, XpressiveGrammar<Char> >
+ , mpl::true_
+ , expression_does_not_match_xpressive_grammar
+ >::type does_expression_match_xpressive_grammar;
+
+ BOOST_MPL_ASSERT((does_expression_match_xpressive_grammar));
+ return xpr;
+ }
+};
+
+///////////////////////////////////////////////////////////////////////////////
+/// \brief For checking if an expression matches xpressive's grammar
+///
+/// check can be used to see if a given expression is a valid narrow
+/// xpressive regular expression. If it is, it will simply return it.
+/// If it isn't, it will cause a simple and short compile-time error.
+/// You may use it as follows:
+/// sregex rx = check( _ << "oops" );
+checker<char> const check = {};
+
+///////////////////////////////////////////////////////////////////////////////
+/// \brief For checking if an expression matches xpressive's grammar
+///
+/// check can be used to see if a given expression is a valid wide
+/// xpressive regular expression. If it is, it will simply return it.
+/// If it isn't, it will cause a simple and short compile-time error.
+/// You may use it as follows:
+/// wsregex rx = wcheck( _ << L"oops" );
+checker<wchar_t> const wcheck = {};
namespace detail
{
@@ -662,6 +732,8 @@
ignore_unused(s7);
ignore_unused(s8);
ignore_unused(s9);
+ ignore_unused(check);
+ ignore_unused(wcheck);
}
}
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