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// file : cult/cli/scanner.hxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#ifndef CULT_CLI_SCANNER_HXX
#define CULT_CLI_SCANNER_HXX
#include <cult/types.hxx>
#include <cult/cli/exceptions.hxx>
#include <cult/cli/arguments.hxx>
namespace Cult
{
namespace CLI
{
class Scanner: public NonCopyable
{
public:
class Action
{
public:
static Action const keep, erase;
friend Boolean
operator== (Action const& a, Action const& b)
{
return a.v_ == b.v_;
}
friend Boolean
operator!= (Action const& a, Action const& b)
{
return a.v_ != b.v_;
}
private:
enum Value { keep_, erase_ } v_;
Action (Value v)
: v_ (v)
{
}
};
public:
Scanner (Arguments& args, Action a = Action::keep, Index start = 1)
: cargs_ (args),
args_ (a == Action::erase ? &args : 0),
next_ (start)
{
}
Scanner (Arguments const& args, Index start = 1)
: cargs_ (args), args_ (0), next_ (start)
{
}
public:
static Char const* const eos;
class PastEOS: public virtual Exception {};
Char const*
next ()
{
if (next_ > cargs_.size ())
{
throw PastEOS ();
}
else if (next_ == cargs_.size ())
{
++next_;
return eos;
}
else
{
Char const* r (cargs_[next_]);
if (args_ != 0)
{
hold_ = r;
args_->erase (next_);
return hold_.c_str ();
}
else
{
++next_;
return r;
}
}
}
Char const*
peek ()
{
if (next_ > cargs_.size ())
{
throw PastEOS ();
}
else if (next_ == cargs_.size ())
{
return eos;
}
else
{
return cargs_[next_];
}
}
Void
skip ()
{
if (next_ > cargs_.size ())
throw PastEOS ();
else
++next_;
}
private:
Arguments const& cargs_;
Arguments* args_;
Index next_;
String hold_;
};
}
}
#include <cult/cli/scanner.ixx>
#endif // CULT_CLI_SCANNER_HXX
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