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// (C) Copyright Jonathan Turkanis 2003.
// 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.)
// See http://www.boost.org/libs/iostreams for documentation.
#ifndef BOOST_IOSTREAMS_DICTIONARY_FILTER_HPP_INCLUDED
#define BOOST_IOSTREAMS_DICTIONARY_FILTER_HPP_INCLUDED
#include <algorithm> // swap.
#include <cassert>
#include <cstdio> // EOF.
#include <iostream> // cin, cout.
#include <cctype>
#include <map>
#include <boost/config.hpp> // BOOST_NO_STDC_NAMESPACE.
#include <boost/iostreams/concepts.hpp>
#include <boost/iostreams/filter/stdio.hpp>
#include <boost/iostreams/operations.hpp>
#ifdef BOOST_NO_STDC_NAMESPACE
namespace std {
using ::isalpha;
using ::isupper;
using ::toupper;
using ::tolower;
}
#endif
namespace boost { namespace iostreams { namespace example {
class dictionary {
public:
void add(std::string key, const std::string& value);
void replace(std::string& key);
private:
typedef std::map<std::string, std::string> map_type;
void tolower(std::string& str);
map_type map_;
};
class dictionary_stdio_filter : public stdio_filter {
public:
dictionary_stdio_filter(dictionary& d) : dictionary_(d) { }
private:
void do_filter()
{
using namespace std;
while (true) {
int c = std::cin.get();
if (c == EOF || !std::isalpha((unsigned char) c)) {
dictionary_.replace(current_word_);
cout.write( current_word_.data(),
static_cast<streamsize>(current_word_.size()) );
current_word_.erase();
if (c == EOF)
break;
cout.put(c);
} else {
current_word_ += c;
}
}
}
dictionary& dictionary_;
std::string current_word_;
};
class dictionary_input_filter : public input_filter {
public:
dictionary_input_filter(dictionary& d)
: dictionary_(d), off_(std::string::npos), eof_(false)
{ }
template<typename Source>
int get(Source& src)
{
// Handle unfinished business.
if (off_ != std::string::npos && off_ < current_word_.size())
return current_word_[off_++];
if (off_ == current_word_.size()) {
current_word_.erase();
off_ = std::string::npos;
}
if (eof_)
return EOF;
// Compute curent word.
while (true) {
int c;
if ((c = iostreams::get(src)) == WOULD_BLOCK)
return WOULD_BLOCK;
if (c == EOF || !std::isalpha((unsigned char) c)) {
dictionary_.replace(current_word_);
off_ = 0;
if (c == EOF)
eof_ = true;
else
current_word_ += c;
break;
} else {
current_word_ += c;
}
}
return this->get(src); // Note: current_word_ is not empty.
}
template<typename Source>
void close(Source&)
{
current_word_.erase();
off_ = std::string::npos;
eof_ = false;
}
private:
dictionary& dictionary_;
std::string current_word_;
std::string::size_type off_;
bool eof_;
};
class dictionary_output_filter : public output_filter {
public:
typedef std::map<std::string, std::string> map_type;
dictionary_output_filter(dictionary& d)
: dictionary_(d), off_(std::string::npos)
{ }
template<typename Sink>
bool put(Sink& dest, int c)
{
if (off_ != std::string::npos && !write_current_word(dest))
return false;
if (!std::isalpha((unsigned char) c)) {
dictionary_.replace(current_word_);
off_ = 0;
}
current_word_ += c;
return true;
}
template<typename Sink>
void close(Sink& dest)
{
// Reset current_word_ and off_, saving old values.
std::string current_word;
std::string::size_type off = 0;
current_word.swap(current_word_);
std::swap(off, off_);
// Write remaining characters to dest.
if (off == std::string::npos) {
dictionary_.replace(current_word);
off = 0;
}
if (!current_word.empty())
iostreams::write(
dest,
current_word.data() + off,
static_cast<std::streamsize>(current_word.size() - off)
);
}
private:
template<typename Sink>
bool write_current_word(Sink& dest)
{
using namespace std;
streamsize amt = static_cast<streamsize>(current_word_.size() - off_);
streamsize result =
iostreams::write(dest, current_word_.data() + off_, amt);
if (result == amt) {
current_word_.erase();
off_ = string::npos;
return true;
} else {
off_ += result;
return false;
}
}
dictionary& dictionary_;
std::string current_word_;
std::string::size_type off_;
bool initialized_;
};
//------------------Implementation of dictionary------------------------------//
inline void dictionary::add(std::string key, const std::string& value)
{
tolower(key);
map_[key] = value;
}
inline void dictionary::replace(std::string& key)
{
using namespace std;
string copy(key);
tolower(copy);
map_type::iterator it = map_.find(key);
if (it == map_.end())
return;
string& value = it->second;
if (!value.empty() && !key.empty() && std::isupper((unsigned char) key[0]))
value[0] = std::toupper((unsigned char) value[0]);
key = value;
return;
}
inline void dictionary::tolower(std::string& str)
{
for (std::string::size_type z = 0, len = str.size(); z < len; ++z)
str[z] = std::tolower((unsigned char) str[z]);
}
} } } // End namespaces example, iostreams, boost.
#endif // #ifndef BOOST_IOSTREAMS_DICTIONARY_FILTER_HPP_INCLUDED
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