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// file : backend-elements/indentation/sloc.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_INDENTATION_SLOC_HXX
#define BACKEND_ELEMENTS_INDENTATION_SLOC_HXX
#include <backend-elements/types.hxx>
#include <backend-elements/indentation/buffer.hxx>
#include <cctype>
#include <iostream> //@@ tmp
namespace BackendElements
{
namespace Indentation
{
template <typename C>
class SLOC: public Buffer<C>/*, public NonCopyable*/
{
public:
typedef
typename Buffer<C>::Traits
Traits;
typedef
typename Buffer<C>::AsChar
AsChar;
typedef
typename Buffer<C>::AsInt
AsInt;
typedef
typename Buffer<C>::Write
Write;
public:
SLOC (Buffer<C>& out)
: out_ (out),
count_ (0),
prev_ ('\0'),
code_counted_ (false),
construct_ (Construct::code)
{
}
UnsignedLong
count () const
{
return count_;
}
public:
virtual AsInt
put (AsChar c)
{
typename Construct::Value old (construct_);
switch (construct_)
{
case Construct::code:
{
code (c);
break;
}
case Construct::c_comment:
{
c_comment (c);
break;
}
case Construct::cxx_comment:
{
cxx_comment (c);
break;
}
case Construct::char_literal:
{
char_literal (c);
break;
}
case Construct::string_literal:
{
string_literal (c);
break;
}
}
// There are cases when a previous character has been already
// 'used' and therefore can not be used again. Good example
// would be '/* *//'. Here, the second slash doesn't start
// C++ comment since it was already used by C comment.
//
// To account for this we are going to set prev_ to '\0' when
// the mode changes.
//
prev_ = (old == construct_) ? c : '\0';
return out_.put (c);
}
virtual Void
unbuffer ()
{
}
private:
Void
code (AsChar c)
{
bool count (true);
switch (c)
{
case '/':
{
if (prev_ == '/')
{
construct_ = Construct::cxx_comment;
count = false;
}
else
{
// This slash can be a beginning of a comment but we
// yet have no way to know. Will have to examine it later
// (see below).
//
count = false;
}
break;
}
case '*':
{
if (prev_ == '/')
{
construct_ = Construct::c_comment;
count = false;
}
break;
}
case '\'':
{
construct_ = Construct::char_literal;
break;
}
case '"':
{
construct_ = Construct::string_literal;
break;
}
case '\n':
{
code_counted_ = false; // reset for a new line
count = false;
break;
}
default:
{
if (std::isspace (c))
count = false;
break;
}
}
// The second condition here accounts for the fact that we cannot
// count '/' right away since it can be a beginning of a comment.
//
if (!code_counted_ &&
(count || (prev_ == '/' && construct_ == Construct::code)))
{
//std::wcerr << "detected code @ " << c << std::endl;
count_++;
code_counted_ = true;
}
}
Void
c_comment (AsChar c)
{
switch (c)
{
case '/':
{
if (prev_ == '*')
construct_ = Construct::code;
break;
}
case '\n':
{
code_counted_ = false; // reset for a new line
break;
}
}
}
Void
cxx_comment (AsChar c)
{
switch (c)
{
case '\n':
{
construct_ = Construct::code;
code_counted_ = false; // reset for a new line
break;
}
}
}
Void
char_literal (AsChar c)
{
switch (c)
{
case '\'':
{
if (prev_ != '\\')
construct_ = Construct::code;
break;
}
}
}
Void
string_literal (AsChar c)
{
switch (c)
{
case '"':
{
if (prev_ != '\\')
construct_ = Construct::code;
break;
}
case '\n':
{
/*@@ Should I count multi-line string literal as multiple SLOC? */
break;
}
}
}
private:
Buffer<C>& out_;
UnsignedLong count_;
AsChar prev_; // previous character or '\0'
struct Construct
{
enum Value
{
code,
c_comment,
cxx_comment,
char_literal,
string_literal
};
};
// code
//
bool code_counted_;
//@@ gcc bug# 18304
//
typename Construct::Value construct_;
};
}
}
//#include <backend-elements/indentation/sloc.txx>
#endif // BACKEND_ELEMENTS_INDENTATION_SLOC_HXX
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