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translit.cpp
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translit.cpp
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#include "translit.hpp"
#include "../../lib/filter.hpp"
#include <string>
#include <algorithm>
#include <functional>
namespace {
typedef std::function<bool(std::string::size_type)> Matcher;
void transliterate(
const std::string& replace, const std::string& with,
std::istream& in, std::ostream& out
);
void transliterateWithSquash(
const std::string& replace, const std::string& with,
Matcher matchFound,
std::istream& in, std::ostream& out
);
void removeCharacters(
const std::string& remove,
Matcher matchFound,
std::istream& in, std::ostream& out
);
bool in_range(std::string::size_type p) {
return p != std::string::npos;
}
bool out_of_range(std::string::size_type p) {
return p == std::string::npos;
}
}
void stiX::translit(
const std::string& replace,
const std::string& with,
stiX::Selection selectionMode,
std::istream& in,
std::ostream& out
) {
auto matcher = (selectionMode == stiX::Selection::Normal)
? in_range
: out_of_range;
if (with.empty())
removeCharacters(replace, matcher, in, out);
else if (replace.size() > with.size())
transliterateWithSquash(replace, with, matcher, in, out);
else
transliterate(replace, with, in, out);
} // stiX::translit
namespace {
void transliterate(
const std::string& replace, const std::string& with,
std::istream& in, std::ostream& out
) {
stiX::raw_filter(
in,
out,
[&replace, &with](char c) {
auto replacement = replace.find(c);
return replacement != std::string::npos
? with[replacement]
: c;
}
);
} // transliterate
class translitterAndSquash {
public:
translitterAndSquash(
const std::string& replace,
const std::string& with,
Matcher matchFound
)
: replace_(replace)
, with_(with)
, matchFound_(matchFound)
, boundary_(with.size() - 1)
, squash_(*with.rbegin()) {
} // translitterAndSquash
std::string operator()(char c) {
auto replacement = replace_.find(c);
if (!matchFound_(replacement)) {
squashing_ = false;
return std::string(1, c);
} // nothing to do
if (
(replacement >= boundary_)
&& squashing_
) {
return std::string();
} // already squashing - do nothing
squashing_ = (replacement >= boundary_);
return std::string(
1,
squashing_ ? squash_ : with_[replacement]
);
} // operator
private:
const std::string& replace_;
std::string with_;
Matcher matchFound_;
const char squash_;
std::string::size_type boundary_;
bool squashing_ = false;
}; // translitterAndSquash
void transliterateWithSquash(
const std::string& replace, const std::string& with,
Matcher matchFound,
std::istream& in, std::ostream& out
) {
stiX::filter(
in,
out,
translitterAndSquash(replace, with, matchFound)
);
}
void removeCharacters(
const std::string& remove,
Matcher matchFound,
std::istream& in, std::ostream& out
) {
std::remove_copy_if(
std::istreambuf_iterator(in),
std::istreambuf_iterator<char>(),
std::ostreambuf_iterator(out),
[&remove, &matchFound](char c) {
return matchFound(remove.find(c));
}
);
}
} // namespace