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// file : backend-elements/regex.hxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#ifndef BACKEND_ELEMENTS_REGEX_HXX
#define BACKEND_ELEMENTS_REGEX_HXX
#include <ostream>
#include <boost/regex.hpp>
#include <backend-elements/types.hxx>
namespace BackendElements
{
namespace Regex
{
template <typename C>
struct Format
{
Format (StringTemplate<C> const& expression,
StringTemplate<C> const& description)
: expression_ (expression), description_ (description)
{
}
StringTemplate<C> const&
expression () const
{
return expression_;
}
StringTemplate<C> const&
description () const
{
return description_;
}
private:
StringTemplate<C> expression_;
StringTemplate<C> description_;
};
// Regex pattern.
//
template <typename C>
struct Pattern
{
Pattern ()
{
}
Pattern (Char const* p)
{
init (StringTemplate<C> (p));
}
Pattern (StringTemplate<C> const& p)
{
init (p);
}
Pattern&
operator= (Char const* p)
{
init (StringTemplate<C> (p));
return *this;
}
Pattern&
operator= (StringTemplate<C> const& p)
{
init (p);
return *this;
}
public:
Boolean
match (StringTemplate<C> const& s) const
{
return regex_match (s, pat_, boost::format_all);
}
StringTemplate<C>
merge (StringTemplate<C> const& sub,
StringTemplate<C> const& s,
Boolean first_only = false) const
{
if (first_only)
return regex_merge (
s, pat_, sub, boost::format_all | boost::format_first_only);
else
return regex_merge ( s, pat_, sub, boost::format_all);
}
public:
Boolean
empty () const
{
return pat_.empty ();
}
public:
boost::basic_regex<C> const&
impl_pattern () const
{
return pat_;
}
private:
Void
init (StringTemplate<C> const& r);
private:
boost::basic_regex<C> pat_;
};
template <typename C1, typename C2>
inline std::basic_ostream<C1>&
operator<< (std::basic_ostream<C1>& os, Pattern<C2> const& p)
{
return os << p.impl_pattern ().str ().c_str ();
}
// Regex expression: '/pattern/substitution/'.
//
template <typename C>
struct Expression
{
Expression ()
{
}
// Expression is of the form /regex/format/ where '/' can be
// replaced with any delimiter.
//
Expression (Char const* e)
{
init (StringTemplate<C> (e));
}
Expression (StringTemplate<C> const& e)
{
init (e);
}
Expression&
operator= (Char const* e)
{
init (StringTemplate<C> (e));
return *this;
}
Expression&
operator= (StringTemplate<C> const& e)
{
init (e);
return *this;
}
public:
Boolean
match (StringTemplate<C> const& s) const
{
return pat_.match (s);
}
StringTemplate<C>
merge (StringTemplate<C> const& s, Boolean first_only = false) const
{
return pat_.merge (sub_, s, first_only);
}
public:
const Pattern<C>&
pattern () const
{
return pat_;
}
const StringTemplate<C>&
substitution () const
{
return sub_;
}
public:
Boolean
empty () const
{
return pat_.empty () && sub_.empty ();
}
private:
Void
init (StringTemplate<C> const& r);
private:
Pattern<C> pat_;
StringTemplate<C> sub_;
};
}
}
#include <backend-elements/regex.txx>
#endif // BACKEND_ELEMENTS_REGEX_HXX
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