20170303.cpp

#include <iostream>
#include <string>

using namespace std;

string html(string text)
{
	size_t pos = text.find("_");
	while (pos != string::npos)
	{
		text.replace(pos, 1, "<em>");
		size_t nxp = text.find("_", pos);
		text.replace(nxp, 1, "</em>");
		pos = text.find("_", nxp);
	}
	pos = text.find("[");
	while (pos != string::npos)
	{
		size_t nxp = text.find("]", pos);
		size_t lp = text.find("(", nxp);
		size_t rp = text.find(")", lp);
		string tt = text.substr(pos + 1, nxp - pos - 1);
		string lk = text.substr(lp + 1, rp - lp - 1);
		text.replace(text.begin() + pos, text.begin() + rp + 1, "<a href=\"" + lk + "\">" + tt + "</a>");
		pos = text.find("[", rp);
	}
	if (text[0] == '#')
	{
		int i = 0;
		while (text[i] == '#') ++i;
		text = text.substr(i + 1);
		text = "<h" + string(1, '0' + i) + ">" + text;
		text.insert(text.size() - 1, "</h" + string(1, '0' + i) + ">");
	}
	else if (text[0] == '*')
	{
		text.insert(0, "<ul>\n");
		text.insert(text.size(), "</ul>\n");
		size_t pos = text.find("*");
		while (pos != string::npos)
		{
			text.replace(pos, 2, "<li>");
			size_t nxp = text.find("\n", pos);
			text.insert(nxp, "</li>");
			pos = text.find("*", nxp);
		}
	}
	else
	{
		text = "<p>" + text;
		text.insert(text.size() - 1, "</p>");
	}
	return text;
}

int main()
{
	std::ios::sync_with_stdio(false);
	string line, text, ans;
	bool x = false;
	while (getline(cin, line))
	{
		if (line.size() > 0)
		{
			text += line + "\n";
		}
		else
		{
			ans += html(text);
			text = "";
		}
	}
	ans += html(text);
	cout << ans;
	return 0;
}