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/*=============================================================================
Boost.Wave: A Standard compliant C++ preprocessor library
http://www.boost.org/
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(MACRO_HELPERS_HPP_931BBC99_EBFA_4692_8FBE_B555998C2C39_INCLUDED)
#define MACRO_HELPERS_HPP_931BBC99_EBFA_4692_8FBE_B555998C2C39_INCLUDED
#include <vector>
#include <boost/assert.hpp>
#include <boost/wave/wave_config.hpp>
#include <boost/wave/token_ids.hpp>
#include <boost/wave/cpplexer/validate_universal_char.hpp>
#include <boost/wave/util/unput_queue_iterator.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 util {
namespace impl {
// escape a string literal (insert '\\' before every '\"', '?' and '\\')
template <typename StringT>
inline StringT
escape_lit(StringT const &value)
{
StringT result;
typename StringT::size_type pos = 0;
typename StringT::size_type pos1 = value.find_first_of ("\"\\?", 0);
if (StringT::npos != pos1) {
do {
result += value.substr(pos, pos1-pos)
+ StringT("\\")
+ StringT(1, value[pos1]);
pos1 = value.find_first_of ("\"\\?", pos = pos1+1);
} while (StringT::npos != pos1);
result += value.substr(pos);
}
else {
result = value;
}
return result;
}
// un-escape a string literal (remove '\\' just before '\\', '\"' or '?')
template <typename StringT>
inline StringT
unescape_lit(StringT const &value)
{
StringT result;
typename StringT::size_type pos = 0;
typename StringT::size_type pos1 = value.find_first_of ("\\", 0);
if (StringT::npos != pos1) {
do {
switch (value[pos1+1]) {
case '\\':
case '\"':
case '?':
result = result + value.substr(pos, pos1-pos);
pos1 = value.find_first_of ("\\", (pos = pos1+1)+1);
break;
case 'n':
result = result + value.substr(pos, pos1-pos) + "\n";
pos1 = value.find_first_of ("\\", pos = pos1+1);
++pos;
break;
default:
result = result + value.substr(pos, pos1-pos+1);
pos1 = value.find_first_of ("\\", pos = pos1+1);
}
} while (pos1 != StringT::npos);
result = result + value.substr(pos);
}
else {
// the string doesn't contain any escaped character sequences
result = value;
}
return result;
}
// return the string representation of a token sequence
template <typename ContainerT, typename PositionT>
inline typename ContainerT::value_type::string_type
as_stringlit (ContainerT const &token_sequence, PositionT const &pos)
{
using namespace boost::wave;
typedef typename ContainerT::value_type::string_type string_type;
string_type result("\"");
bool was_whitespace = false;
typename ContainerT::const_iterator end = token_sequence.end();
for (typename ContainerT::const_iterator it = token_sequence.begin();
it != end; ++it)
{
token_id id = token_id(*it);
if (IS_CATEGORY(*it, WhiteSpaceTokenType) || T_NEWLINE == id) {
if (!was_whitespace) {
// C++ standard 16.3.2.2 [cpp.stringize]
// Each occurrence of white space between the argument's
// preprocessing tokens becomes a single space character in the
// character string literal.
result += " ";
was_whitespace = true;
}
}
else if (T_STRINGLIT == id || T_CHARLIT == id) {
// string literals and character literals have to be escaped
result += impl::escape_lit((*it).get_value());
was_whitespace = false;
}
else
#if BOOST_WAVE_SUPPORT_VARIADICS_PLACEMARKERS != 0
if (T_PLACEMARKER != id)
#endif
{
// now append this token to the string
result += (*it).get_value();
was_whitespace = false;
}
}
result += "\"";
// validate the resulting literal to contain no invalid universal character
// value (throws if invalid chars found)
boost::wave::cpplexer::impl::validate_literal(result, pos.get_line(),
pos.get_column(), pos.get_file());
return result;
}
#if BOOST_WAVE_SUPPORT_VARIADICS_PLACEMARKERS != 0
// return the string representation of a token sequence
template <typename ContainerT, typename PositionT>
inline typename ContainerT::value_type::string_type
as_stringlit (std::vector<ContainerT> const &arguments,
typename std::vector<ContainerT>::size_type i, PositionT const &pos)
{
using namespace boost::wave;
typedef typename ContainerT::value_type::string_type string_type;
BOOST_ASSERT(i < arguments.size());
string_type result("\"");
bool was_whitespace = false;
for (/**/; i < arguments.size(); ++i) {
// stringize all remaining arguments
typename ContainerT::const_iterator end = arguments[i].end();
for (typename ContainerT::const_iterator it = arguments[i].begin();
it != end; ++it)
{
token_id id = token_id(*it);
if (IS_CATEGORY(*it, WhiteSpaceTokenType) || T_NEWLINE == id) {
if (!was_whitespace) {
// C++ standard 16.3.2.2 [cpp.stringize]
// Each occurrence of white space between the argument's
// preprocessing tokens becomes a single space character in the
// character string literal.
result += " ";
was_whitespace = true;
}
}
else if (T_STRINGLIT == id || T_CHARLIT == id) {
// string literals and character literals have to be escaped
result += impl::escape_lit((*it).get_value());
was_whitespace = false;
}
else if (T_PLACEMARKER != id) {
// now append this token to the string
result += (*it).get_value();
was_whitespace = false;
}
}
// append comma, if not last argument
if (i < arguments.size()-1) {
result += ",";
was_whitespace = false;
}
}
result += "\"";
// validate the resulting literal to contain no invalid universal character
// value (throws if invalid chars found)
boost::wave::cpplexer::impl::validate_literal(result, pos.get_line(),
pos.get_column(), pos.get_file());
return result;
}
#endif // BOOST_WAVE_SUPPORT_VARIADICS_PLACEMARKERS != 0
// return the string representation of a token sequence
template <typename StringT, typename IteratorT>
inline StringT
as_string(IteratorT it, IteratorT const& end)
{
StringT result;
for (/**/; it != end; ++it)
{
result += (*it).get_value();
}
return result;
}
// return the string representation of a token sequence
template <typename ContainerT>
inline typename ContainerT::value_type::string_type
as_string (ContainerT const &token_sequence)
{
typedef typename ContainerT::value_type::string_type string_type;
return as_string<string_type>(token_sequence.begin(),
token_sequence.end());
}
#if BOOST_WAVE_SUPPORT_VARIADICS_PLACEMARKERS != 0
///////////////////////////////////////////////////////////////////////////
//
// Copies all arguments beginning with the given index to the output
// sequence. The arguments are separated by commas.
//
template <typename ContainerT, typename PositionT>
void replace_ellipsis (std::vector<ContainerT> const &arguments,
typename ContainerT::size_type index,
ContainerT &expanded, PositionT const &pos)
{
using namespace cpplexer;
typedef typename ContainerT::value_type token_type;
token_type comma(T_COMMA, ",", pos);
for (/**/; index < arguments.size(); ++index) {
ContainerT const &arg = arguments[index];
std::copy(arg.begin(), arg.end(),
std::inserter(expanded, expanded.end()));
if (index < arguments.size()-1)
expanded.push_back(comma);
}
}
#endif
// Skip all whitespace characters and queue the skipped characters into the
// given container
template <typename IteratorT>
inline boost::wave::token_id
skip_whitespace(IteratorT &first, IteratorT const &last)
{
token_id id = util::impl::next_token<IteratorT>::peek(first, last, false);
if (IS_CATEGORY(id, WhiteSpaceTokenType)) {
do {
++first;
id = util::impl::next_token<IteratorT>::peek(first, last, false);
} while (IS_CATEGORY(id, WhiteSpaceTokenType));
}
++first;
return id;
}
template <typename IteratorT, typename ContainerT>
inline boost::wave::token_id
skip_whitespace(IteratorT &first, IteratorT const &last, ContainerT &queue)
{
queue.push_back (*first); // queue up the current token
token_id id = util::impl::next_token<IteratorT>::peek(first, last, false);
if (IS_CATEGORY(id, WhiteSpaceTokenType)) {
do {
queue.push_back(*++first); // queue up the next whitespace
id = util::impl::next_token<IteratorT>::peek(first, last, false);
} while (IS_CATEGORY(id, WhiteSpaceTokenType));
}
++first;
return id;
}
} // namespace impl
///////////////////////////////////////////////////////////////////////////////
} // namespace util
} // 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(MACRO_HELPERS_HPP_931BBC99_EBFA_4692_8FBE_B555998C2C39_INCLUDED)
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