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201703-3. Markdown.cpp
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201703-3. Markdown.cpp
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#include <bits/stdc++.h>
using namespace std;
using gg = long long;
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
string line;
vector<vector<string>> input{{}};
while (getline(cin, line)) {
if (line.empty()) {
input.push_back({});
} else {
input.back().push_back(line);
}
}
vector<pair<regex, string>> r{
{regex("^\\* +(.*)$"), "<li>$1</li>"}, //无序列表
{regex("_(.*?)_"), "<em>$1</em>"}, //强调
{regex("\\[(.*?)\\]\\((.*?)\\)"), "<a href=\"$2\">$1</a>"} //超链接
};
for (gg i = 1; i <= 6; ++i) { // 6种等级标题
r.push_back({regex("^" + string(i, '#') + " +(.*)$"),
"<h" + to_string(i) + ">$1</h" + to_string(i) + ">"});
}
for (auto& i : input) {
if (i.empty()) { //空区块,略过
continue;
}
// type为0/1/2分别表示无序列表、标题、段落
gg type = i[0][0] == '*' ? 0 : i[0][0] == '#' ? 1 : 2;
cout << (type == 0 ? "<ul>\n" : type == 2 ? "<p>" : "");
for (gg j = 0; j < i.size(); ++j) {
for (auto& k : r) {
i[j] = regex_replace(i[j], k.first, k.second);
}
cout << i[j] << (j == i.size() - 1 ? "" : "\n");
}
cout << (type == 0 ? "\n</ul>" : type == 2 ? "</p>" : "") << "\n";
}
return 0;
}