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// file : CCF/CodeGenerationKit/IndentationIDL.hpp
// author : Boris Kolpackov <boris@dre.vanderbilt.edu>
// cvs-id : $Id$
#ifndef CCF_CODE_GENERATION_KIT_INDENTATION_IDL_HPP
#define CCF_CODE_GENERATION_KIT_INDENTATION_IDL_HPP
#include <deque>
#include "CCF/CodeGenerationKit/IndentationBuffer.hpp"
namespace Indentation
{
template <typename C>
class IDL : public Buffer<C>
{
public:
typedef
typename Buffer<C>::traits_type
traits_type;
typedef
typename Buffer<C>::char_type
char_type;
typedef
typename Buffer<C>::int_type
int_type;
typedef
typename Buffer<C>::EndOfStream
EndOfStream;
public:
IDL (Buffer<C>& out)
: out_ (out),
indentation_ (0),
spaces_ (2),
construct_ (OTHER)
{
}
virtual
~IDL () throw () {}
public:
virtual int_type
put (char_type c) throw (ExH::System::Exception)
{
int_type result = traits_type::to_int_type (c);
try
{
bool defaulting = false;
switch (c)
{
case '\n':
{
hold_.push_back (c);
break;
}
case '{':
{
ensure_new_line ();
output_indentation ();
result = write (c);
ensure_new_line ();
indentation_++;
break;
}
case '}':
{
if (indentation_ > 0) indentation_--;
// Reduce multiple newlines to one.
while (hold_.size () > 1)
{
typename Hold::reverse_iterator i = hold_.rbegin ();
if (*i == '\n' && *(i + 1) == '\n') hold_.pop_back ();
else break;
}
ensure_new_line ();
output_indentation ();
hold_.push_back (c);
// result = write (c);
//ensure_new_line ();
// Add double newline after '}'.
//
hold_.push_back ('\n');
hold_.push_back ('\n');
break;
}
case ';':
{
// Handling '};' case.
//
bool brace (false);
if (hold_.size () > 1 && hold_.back () == '\n')
{
bool pop_nl (false);
for (typename Hold::reverse_iterator
i (hold_.rbegin ()), e (hold_.rend ()); i != e; ++i)
{
if (*i != '\n')
{
if (*i == '}') brace = pop_nl = true;
break;
}
}
if (pop_nl) while (hold_.back () == '\n') hold_.pop_back ();
}
output_indentation ();
result = write (c);
if (brace)
{
hold_.push_back ('\n');
hold_.push_back ('\n');
}
if (construct_ != STRING_LITERAL && construct_ != CHAR_LITERAL)
{
ensure_new_line ();
}
break;
}
case '\\':
{
hold_.push_back (c);
break;
}
case '\"':
{
if (hold_.empty () || hold_.back () != '\\')
{
// not escape sequence
if (construct_ == STRING_LITERAL) construct_ = OTHER;
else construct_ = STRING_LITERAL;
}
defaulting = true;
break;
}
case '\'':
{
if (hold_.empty () || hold_.back () != '\\')
{
// not escape sequence
if (construct_ == CHAR_LITERAL) construct_ = OTHER;
else construct_ = CHAR_LITERAL;
}
defaulting = true;
break;
}
default:
{
defaulting = true;
break;
}
}
if (defaulting)
{
output_indentation ();
result = write (c);
}
}
catch (Full const&)
{
result = traits_type::eof ();
}
return result;
}
virtual void
unbuffer () throw (EndOfStream, ExH::System::Exception)
{
int_type result;
while (!hold_.empty ())
{
result = out_.put (hold_.front ());
//@@ failed
if (result == traits_type::eof ())
{
throw EndOfStream ("unable to flush buffer");
}
hold_.pop_front ();
}
}
private:
class Full {};
void
ensure_new_line ()
{
if (hold_.empty () || hold_.back () != '\n')
{
hold_.push_back ('\n');
}
}
void
output_indentation () throw (Full)
{
if (!hold_.empty () && hold_.back () == '\n')
{
for (unsigned long i = 0; i < indentation_ * spaces_; i++)
{
write (' ');
}
}
}
int_type
write (char_type c) throw (Full)
{
hold_.push_back (c);
int_type result (traits_type::eof ());
while (!hold_.empty ())
{
result = out_.put (hold_.front ());
if (result == traits_type::eof ()) throw Full ();
hold_.pop_front ();
}
return result;
}
private:
Buffer<C>& out_;
unsigned long indentation_;
unsigned long spaces_;
bool suppress_nl_;
enum Construct
{
OTHER,
STRING_LITERAL,
CHAR_LITERAL
};
Construct construct_;
typedef
std::deque<int_type>
Hold;
Hold hold_;
};
}
#endif // CCF_CODE_GENERATION_KIT_INDENTATION_IDL_HPP
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