111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
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#include <rxcpp/rx-lite.hpp>
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#include <rxcpp/operators/rx-reduce.hpp>
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#include <rxcpp/operators/rx-filter.hpp>
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#include <rxcpp/operators/rx-map.hpp>
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#include <rxcpp/operators/rx-tap.hpp>
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#include <rxcpp/operators/rx-concat_map.hpp>
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#include <rxcpp/operators/rx-flat_map.hpp>
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#include <rxcpp/operators/rx-concat.hpp>
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#include <rxcpp/operators/rx-merge.hpp>
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#include <rxcpp/operators/rx-repeat.hpp>
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#include <rxcpp/operators/rx-publish.hpp>
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#include <rxcpp/operators/rx-ref_count.hpp>
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#include <rxcpp/operators/rx-window.hpp>
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#include <rxcpp/operators/rx-window_toggle.hpp>
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#include <rxcpp/operators/rx-start_with.hpp>
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namespace Rx {
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using namespace rxcpp;
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using namespace rxcpp::sources;
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using namespace rxcpp::operators;
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using namespace rxcpp::util;
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}
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using namespace Rx;
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#include <regex>
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#include <random>
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using namespace std;
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using namespace std::chrono;
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int main()
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{
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random_device rd; // non-deterministic generator
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mt19937 gen(rd());
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uniform_int_distribution<> dist(4, 18);
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// for testing purposes, produce byte stream that from lines of text
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auto bytes = range(0, 10) |
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flat_map([&](int i){
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auto body = from((uint8_t)('A' + i)) |
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repeat(dist(gen)) |
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as_dynamic();
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auto delim = from((uint8_t)'\r');
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return from(body, delim) | concat();
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}) |
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window(17) |
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flat_map([](observable<uint8_t> w){
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return w |
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reduce(
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vector<uint8_t>(),
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[](vector<uint8_t> v, uint8_t b){
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v.push_back(b);
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return v;
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}) |
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as_dynamic();
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}) |
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tap([](vector<uint8_t>& v){
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// print input packet of bytes
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copy(v.begin(), v.end(), ostream_iterator<long>(cout, " "));
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cout << endl;
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});
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//
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// recover lines of text from byte stream
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//
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auto removespaces = [](string s){
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s.erase(remove_if(s.begin(), s.end(), ::isspace), s.end());
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return s;
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};
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// create strings split on \r
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auto strings = bytes |
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concat_map([](vector<uint8_t> v){
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string s(v.begin(), v.end());
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regex delim(R"/(\r)/");
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cregex_token_iterator cursor(&s[0], &s[0] + s.size(), delim, {-1, 0});
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cregex_token_iterator end;
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vector<string> splits(cursor, end);
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return iterate(move(splits));
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}) |
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filter([](const string& s){
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return !s.empty();
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}) |
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publish() |
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ref_count();
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// filter to last string in each line
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auto closes = strings |
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filter(
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[](const string& s){
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return s.back() == '\r';
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}) |
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Rx::map([](const string&){return 0;});
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// group strings by line
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auto linewindows = strings |
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window_toggle(closes | start_with(0), [=](int){return closes;});
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// reduce the strings for a line into one string
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auto lines = linewindows |
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flat_map([&](observable<string> w) {
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return w | start_with<string>("") | sum() | Rx::map(removespaces);
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});
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// print result
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lines |
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subscribe<string>(println(cout));
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return 0;
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}
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