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/*=============================================================================
Boost.Wave: A Standard compliant C++ preprocessor library
Whitespace eater
http://www.boost.org/
Copyright (c) 2003 Paul Mensonides
Copyright (c) 2001-2011 Hartmut Kaiser.
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#if !defined(WHITESPACE_HANDLING_HPP_INCLUDED)
#define WHITESPACE_HANDLING_HPP_INCLUDED
#include <boost/wave/wave_config.hpp>
#include <boost/wave/token_ids.hpp>
#include <boost/wave/preprocessing_hooks.hpp>
#include <boost/wave/language_support.hpp>
// this must occur after all of the includes and before any code appears
#ifdef BOOST_HAS_ABI_HEADERS
#include BOOST_ABI_PREFIX
#endif
///////////////////////////////////////////////////////////////////////////////
namespace boost {
namespace wave {
namespace context_policies {
namespace util {
///////////////////////////////////////////////////////////////////////////
// This function returns true if the given C style comment contains at
// least one newline
template <typename TokenT>
bool ccomment_has_newline(TokenT const& token)
{
using namespace boost::wave;
if (T_CCOMMENT == token_id(token) &&
TokenT::string_type::npos != token.get_value().find_first_of("\n"))
{
return true;
}
return false;
}
///////////////////////////////////////////////////////////////////////////
// This function returns the number of newlines in the given C style
// comment
template <typename TokenT>
int ccomment_count_newlines(TokenT const& token)
{
using namespace boost::wave;
int newlines = 0;
if (T_CCOMMENT == token_id(token)) {
typename TokenT::string_type const& value = token.get_value();
typename TokenT::string_type::size_type p = value.find_first_of("\n");
while (TokenT::string_type::npos != p) {
++newlines;
p = value.find_first_of("\n", p+1);
}
}
return newlines;
}
#if BOOST_WAVE_SUPPORT_CPP0X != 0
///////////////////////////////////////////////////////////////////////////
// This function returns the number of newlines in the given C++0x style
// raw string
template <typename TokenT>
int rawstring_count_newlines(TokenT const& token)
{
using namespace boost::wave;
int newlines = 0;
if (T_RAWSTRINGLIT == token_id(token)) {
typename TokenT::string_type const& value = token.get_value();
typename TokenT::string_type::size_type p = value.find_first_of("\n");
while (TokenT::string_type::npos != p) {
++newlines;
p = value.find_first_of("\n", p+1);
}
}
return newlines;
}
#endif
}
///////////////////////////////////////////////////////////////////////////////
template <typename TokenT>
class eat_whitespace
: public default_preprocessing_hooks
{
public:
eat_whitespace();
template <typename ContextT>
bool may_skip_whitespace(ContextT const& ctx, TokenT &token,
bool &skipped_newline);
template <typename ContextT>
bool may_skip_whitespace(ContextT const& ctx, TokenT &token,
bool preserve_comments_, bool preserve_bol_whitespace_,
bool &skipped_newline);
protected:
bool skip_cppcomment(boost::wave::token_id id)
{
return !preserve_comments && T_CPPCOMMENT == id;
}
private:
typedef bool state_t(TokenT &token, bool &skipped_newline);
state_t eat_whitespace::* state;
state_t general, newline, newline_2nd, whitespace, bol_whitespace;
bool preserve_comments;
bool preserve_bol_whitespace;
};
template <typename TokenT>
inline
eat_whitespace<TokenT>::eat_whitespace()
: state(&eat_whitespace::newline), preserve_comments(false),
preserve_bol_whitespace(false)
{
}
template <typename TokenT>
template <typename ContextT>
inline bool
eat_whitespace<TokenT>::may_skip_whitespace(ContextT const& ctx, TokenT &token,
bool &skipped_newline)
{
// re-initialize the preserve comments state
preserve_comments = boost::wave::need_preserve_comments(ctx.get_language());
return (this->*state)(token, skipped_newline);
}
template <typename TokenT>
template <typename ContextT>
inline bool
eat_whitespace<TokenT>::may_skip_whitespace(ContextT const& ctx, TokenT &token,
bool preserve_comments_, bool preserve_bol_whitespace_,
bool &skipped_newline)
{
// re-initialize the preserve comments state
preserve_comments = preserve_comments_;
preserve_bol_whitespace = preserve_bol_whitespace_;
return (this->*state)(token, skipped_newline);
}
template <typename TokenT>
inline bool
eat_whitespace<TokenT>::general(TokenT &token, bool &skipped_newline)
{
using namespace boost::wave;
token_id id = token_id(token);
if (T_NEWLINE == id || T_CPPCOMMENT == id) {
state = &eat_whitespace::newline;
}
else if (T_SPACE == id || T_SPACE2 == id || T_CCOMMENT == id) {
state = &eat_whitespace::whitespace;
if (util::ccomment_has_newline(token))
skipped_newline = true;
if ((!preserve_comments || T_CCOMMENT != id) &&
token.get_value().size() > 1)
{
token.set_value(" "); // replace with a single space
}
}
else {
state = &eat_whitespace::general;
}
return false;
}
template <typename TokenT>
inline bool
eat_whitespace<TokenT>::newline(TokenT &token, bool &skipped_newline)
{
using namespace boost::wave;
token_id id = token_id(token);
if (T_NEWLINE == id || T_CPPCOMMENT == id) {
skipped_newline = true;
state = &eat_whitespace::newline_2nd;
return T_NEWLINE == id || skip_cppcomment(id);
}
if (T_SPACE != id && T_SPACE2 != id && T_CCOMMENT != id)
return general(token, skipped_newline);
if (T_CCOMMENT == id) {
if (util::ccomment_has_newline(token)) {
skipped_newline = true;
state = &eat_whitespace::newline_2nd;
}
if (preserve_comments) {
state = &eat_whitespace::general;
return false;
}
return true;
}
if (preserve_bol_whitespace) {
state = &eat_whitespace::bol_whitespace;
return false;
}
return true;
}
template <typename TokenT>
inline bool
eat_whitespace<TokenT>::newline_2nd(TokenT &token, bool &skipped_newline)
{
using namespace boost::wave;
token_id id = token_id(token);
if (T_SPACE == id || T_SPACE2 == id) {
if (preserve_bol_whitespace) {
state = &eat_whitespace::bol_whitespace;
return false;
}
return true;
}
if (T_CCOMMENT == id) {
if (util::ccomment_has_newline(token))
skipped_newline = true;
if (preserve_comments) {
state = &eat_whitespace::general;
return false;
}
return true;
}
if (T_NEWLINE != id && T_CPPCOMMENT != id)
return general(token, skipped_newline);
skipped_newline = true;
return T_NEWLINE == id || skip_cppcomment(id);
}
template <typename TokenT>
inline bool
eat_whitespace<TokenT>::bol_whitespace(TokenT &token, bool &skipped_newline)
{
using namespace boost::wave;
token_id id = token_id(token);
if (T_SPACE == id || T_SPACE2 == id)
return !preserve_bol_whitespace;
return general(token, skipped_newline);
}
template <typename TokenT>
inline bool
eat_whitespace<TokenT>::whitespace(TokenT &token, bool &skipped_newline)
{
using namespace boost::wave;
token_id id = token_id(token);
if (T_SPACE != id && T_SPACE2 != id &&
T_CCOMMENT != id && T_CPPCOMMENT != id)
{
return general(token, skipped_newline);
}
if (T_CCOMMENT == id) {
if (util::ccomment_has_newline(token))
skipped_newline = true;
return !preserve_comments;
}
return T_SPACE == id || T_SPACE2 == id || skip_cppcomment(id);
}
///////////////////////////////////////////////////////////////////////////////
} // namespace context_policies
} // namespace wave
} // namespace boost
// the suffix header occurs after all of the code
#ifdef BOOST_HAS_ABI_HEADERS
#include BOOST_ABI_SUFFIX
#endif
#endif // !defined(WHITESPACE_HANDLING_HPP_INCLUDED)
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