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/**
** \file misc/escape.cc
** \brief Implementation for misc/escape.hh.
**/
#include <cctype>
#include <iomanip>
#include <ios>
#include <unordered_map>
#include <misc/escape.hh>
namespace misc
{
std::ostream& escaped::print(std::ostream& ostr) const
{
return escape_(ostr, pobj_str_);
}
std::ostream& escaped::escape_(std::ostream& o, const std::string& es) const
{
// For some reason yet to be found, when we use the locale for
// std::isprint, Valgrind goes berzerk. So we no longer do the
// following:
//
// static std::locale locale("");
//
// if (std::isprint(*p, locale))
std::ios_base::fmtflags flags = o.flags(std::ios_base::oct);
char fill = o.fill('0');
/* The GNU Assembler does not recognize `\a' as a valid
escape sequence, hence this explicit conversion to the
007 octal character. For more information, see
http://sourceware.org/binutils/docs/as/Strings.html. */
static const std::unordered_map<char, std::string> escapes = {
{'\a', R"(\007)"}, {'\b', R"(\b)"}, {'\f', R"(\f)"},
{'\n', R"(\n)"}, {'\r', R"(\r)"}, {'\t', R"(\t)"},
{'\v', R"(\v)"}, {'\\', R"(\\)"}, {'\"', R"(\")"}};
for (const auto& p : es)
{
if (const auto&& it = escapes.find(p); it != escapes.end())
o << it->second;
else
{
if (std::isprint(p))
o << p;
else
o << "\\" << std::setw(3)
<< static_cast<int>(static_cast<unsigned char>(p));
}
}
o.fill(fill);
o.flags(flags);
return o;
}
} // namespace misc
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