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#include <fstream>
#include <iostream>
#include <map>
#include <sstream>
#include <string>
#include <unistd.h>
#include <vector>
using namespace std;
typedef map<string, vector<string>> container_type;
istream&
operator>>(istream& in, container_type& container)
{
static constexpr auto begin_marker = "--8<--";
static constexpr auto end_marker = "-->8--";
auto is_comment = [](string_view s) -> bool {
return s == "//" || s == "/*" || s == "#" || s == "##" || s == "--";
};
// --8<-- match_begin
auto match_begin = [&is_comment](const string& line, string& name) -> bool {
stringstream ss{ line };
string comment, cut_mark;
if ( !(ss >> comment >> cut_mark >> name) ) {
return false;
}
if ( !is_comment(comment) ) {
return false;
}
if ( cut_mark != begin_marker ) {
return false;
}
return true;
};
// -->8--
// --8<-- match_end
auto match_end = [&is_comment](const string& line) -> bool {
stringstream ss{ line };
string comment, cut_mark;
if ( !(ss >> comment >> cut_mark) ) {
return false;
}
if ( !is_comment(comment) ) {
return false;
}
if ( cut_mark != end_marker ) {
return false;
}
return true;
};
// -->8--
vector<string> chunks;
for ( string line; getline(in, line); ) {
string marker;
if ( match_begin(line, marker) ) {
chunks.emplace_back(marker);
}
else if ( match_end(line) ) {
if ( !chunks.empty() ) {
chunks.pop_back();
}
}
else {
for ( const auto& chunk: chunks ) {
container[chunk].emplace_back(line);
}
}
}
return in;
}
ostream&
print(ostream& os, const string& key, const container_type& container)
{
const auto it = container.find(key);
if ( it != container.end() ) {
auto line = begin(it->second);
while ( line != end(it->second) ) {
os << *line << '\n';
++line;
}
}
else {
cerr << "ERROR: " << key << " not found!" << endl;
}
return os;
}
int
main(int argc, char* argv[])
{
int show_tags = 0;
int ch;
opterr = 0;
while ( (ch = getopt(argc, argv, "t")) != -1 ) {
switch ( ch ) {
case 't':
show_tags = 1;
break;
default:
cerr << "unbekannte option" << endl;
return EXIT_FAILURE;
}
}
argc -= optind;
argv += optind;
container_type container;
cin >> container;
if ( show_tags ) {
for ( const auto& it: container ) {
cout << it.first << endl;
}
}
else {
for ( int i = 0; i < argc; ++i ) {
print(cout, argv[i], container);
}
}
}
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