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#include "line_accumulator.h"
#include <iostream>
#include <algorithm>
namespace {
std::uint8_t getRandomIndex(
std::mt19937& random,
const std::uint8_t n
) {
return std::uniform_int_distribution<std::uint8_t>{0, n}(random);
}
std::vector<std::uint8_t> getRandomIndizes(
std::mt19937& random,
const std::uint8_t n
) {
std::vector<std::uint8_t> indizes(n);
std::iota(indizes.begin(), indizes.end(), 0);
std::shuffle(
indizes.begin(),
indizes.end(),
random
);
return indizes;
}
}
LineAccumulator::LineAccumulator(const std::uint8_t max_length):
max_length_{max_length},
device_{},
random_{device_()},
length_{0},
tokens_{} { }
LineAccumulator::~LineAccumulator() {
this->discharge(false);
}
std::uint8_t LineAccumulator::getMissing() const {
return this->max_length_ - this->length_;
}
void LineAccumulator::operator()(const std::string& word) {
if ( ( this->length_ + word.length() ) > this->max_length_ ) {
this->discharge(true);
}
this->tokens_.emplace_back(word, 0);
this->length_ += word.length();
if ( this->length_ < this->max_length_ ) {
this->tokens_.back().second += 1;
this->length_ += 1;
}
}
void LineAccumulator::justify() {
const std::uint8_t base = this->getMissing()
/ (this->tokens_.size() - 1);
std::for_each(
this->tokens_.begin(),
this->tokens_.end()-2,
[&, base](auto& token) {
token.second += base;
this->length_ += base;
}
);
switch ( this->getMissing() ) {
case 0: {
break;
}
case 1: {
this->tokens_[
getRandomIndex(this->random_, this->tokens_.size() - 1)
].second += 1;
break;
}
default: {
const auto indizes = getRandomIndizes(
this->random_,
this->tokens_.size() - 1
);
std::for_each(
indizes.begin(),
indizes.begin() + (this->max_length_ - this->length_),
[&](std::uint8_t x) {
this->tokens_[x].second += 1;
this->length_ += 1;
}
);
break;
}
}
}
void LineAccumulator::discharge(const bool full) {
this->length_ -= this->tokens_.back().second;
this->tokens_.back().second = 0;
if ( full ) {
this->justify();
}
for ( const auto& token : this->tokens_ ) {
std::cout << token.first
<< std::string(token.second, ' ');
}
std::cout << '\n';
this->length_ = 0;
this->tokens_.clear();
}
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