Push all code

src/preprocessor.cpp

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+#include "preprocessor.hpp"
+#include <vector>
+
+#include <iostream> // TODO
+
+std::string DeleteComments(std::string&& text) {
+  std::vector<std::pair<int, int>> text_without_comments;
+  size_t n = text.size();
+  int begin_segment = 0;
+
+  text_without_comments.emplace_back(begin_segment, n);
+
+  for (size_t i = 0; i < n; ++i) {
+    if (text[i] == '/' && i + 1 < n && text[i + 1] == '/') {
+      text_without_comments.pop_back();
+      text_without_comments.emplace_back(begin_segment, i);
+      while (i + 1 < n && text[i + 1] != '\n') {
+        ++i;
+      }
+      begin_segment = i + 1;
+      text_without_comments.emplace_back(begin_segment, n);
+    }
+  }
+
+  int current_place = 0;
+  for (auto i: text_without_comments) {
+    std::copy(text.begin() + i.first, text.begin() + i.second, text.begin() +
+              current_place);
+    current_place += i.second - i.first;
+  }
+  text.resize(current_place);
+  return std::move(text);
+}
+
+std::string DeleteMultiLineComments(std::string&& text) {
+  std::vector<std::pair<int, int>> text_without_comments;
+  size_t n = text.size();
+  int begin_segment = 0;
+
+  text_without_comments.emplace_back(begin_segment, n);
+
+  for (size_t i = 0; i < n; ++i) {
+    if (text[i] == '/' && i + 1 < n && text[i + 1] == '*') {
+      text_without_comments.pop_back();
+      text_without_comments.emplace_back(begin_segment, i);
+      i++;
+      while (i < n && (text[i - 1] != '*' || text[i] != '/')) {
+        ++i;
+      }
+      begin_segment = i + 1;
+      text_without_comments.emplace_back(begin_segment, n);
+    }
+  }
+
+  int current_place = 0;
+  for (auto i: text_without_comments) {
+    std::copy(text.begin() + i.first, text.begin() + i.second, text.begin() +
+              current_place);
+    current_place += i.second - i.first;
+  }
+  text.resize(current_place);
+  return std::move(text);
+}
+
+std::string Preprocessor(std::string&& text) {
+  text = DeleteComments(std::move(text));
+  text = DeleteMultiLineComments(std::move(text));
+  return std::move(text);
+}
+
+std::string Preprocessor(const std::string& text) {
+  std::string copy(text);
+  copy = Preprocessor(std::move(copy));
+  return copy;
+}