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// file : CCF/CodeGenerationKit/IndentationXML.hpp
// author : Diego Sevilla Ruiz <dsevilla@ditec.um.es>
// author : Boris Kolpackov <boris@dre.vanderbilt.edu>
// cvs-id : $Id$
#ifndef CCF_CODE_GENERATION_KIT_INDENTATION_XML_HPP
#define CCF_CODE_GENERATION_KIT_INDENTATION_XML_HPP
#include <deque>
#include "CCF/CodeGenerationKit/IndentationBuffer.hpp"
namespace Indentation
{
template <typename C>
class XML : 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:
XML (Buffer<C>& out)
: out_ (out),
indentation_ (0),
base_indent_ (indentation_),
spaces_ (2),
construct_ (OTHER)
{
}
virtual
~XML () throw () {}
public:
virtual int_type
put (char_type c) throw (ExH::System::Exception)
{
int_type result = traits_type::to_int_type (c);
try
{
switch (c)
{
case '\n':
{
flush_buffer ();
// If we are inside a tag, just output an artificial tab character
if (construct_ == INSIDE_TAG)
{
hold_.push_back (c);
c = traits_type::to_int_type (' ');
// spaces_ - 1 because at the end the last space will be
// put into the hold_ queue.
for (unsigned long i = 0; i < spaces_ - 1; i++)
hold_.push_back (c);
}
base_indent_ = indentation_;
break;
}
// Case with <?xxx and <!DOCTYPE (for example).
// We still don't handle XML comments
case '?':
case '!':
{
if (construct_ == INSIDE_TAG && hold_.back () == '<')
indentation_--;
break;
}
case '<':
{
//@@ This construct must not be INSIDE_TAG
if (construct_ == OTHER)
{
construct_ = INSIDE_TAG;
indentation_++;
}
break;
}
case '>':
{
if (construct_ == INSIDE_TAG)
construct_ = OTHER;
break;
}
case '/':
{
if (construct_ == INSIDE_TAG)
{
if (hold_.back () == '<')
indentation_ -= 2;
else
indentation_--;
if (indentation_ < 0)
indentation_ = 0;
}
break;
}
case '\"':
{
if (construct_ == INSIDE_TAG)
construct_ = STRING_LITERAL;
else if (construct_ == STRING_LITERAL)
construct_ = INSIDE_TAG;
break;
}
}
hold_.push_back (c);
}
catch (Full const&)
{
result = traits_type::eof ();
}
return result;
}
virtual void
unbuffer () throw (EndOfStream, ExH::System::Exception)
{
try
{
flush_buffer ();
} catch (const Full&)
{
throw EndOfStream ("unable to flush buffer");
}
}
private:
class Full {};
void
flush_buffer () throw (Full)
{
long delta = indentation_ - base_indent_;
if (delta > 0)
delta = 0;
while (!hold_.empty ())
{
int_type c = hold_.front ();
write (c);
if (c == '\n')
output_indentation (base_indent_ + delta);
hold_.pop_front ();
}
}
void
output_indentation (unsigned long indentation) throw (Full)
{
for (unsigned long i = 0; i < indentation * spaces_; i++)
{
write (' ');
}
}
int_type
write (int_type c) throw (Full)
{
int_type result;
result = out_.put (c);
if (result == traits_type::eof ()) throw Full ();
return result;
}
private:
Buffer<C>& out_;
long indentation_;
unsigned long base_indent_;
unsigned long spaces_;
enum Construct
{
OTHER,
/* Strings literals can only happen inside tags, like:
* <tag whatever="xxx
*/
STRING_LITERAL,
INSIDE_TAG
};
Construct construct_;
typedef
std::deque<int_type>
Hold;
Hold hold_;
};
}
#endif // CCF_CODE_GENERATION_KIT_INDENTATION_XML_HPP
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