add task 12.15

Author: c71n93

week-15/CMakeLists.txt

@@ -1,4 +1,4 @@
-set(DIRS task-12-14)
+set(DIRS task-12-14 task-12-15)
 foreach(DIR ${DIRS})
     add_subdirectory(${DIR})
 endforeach()

week-15/task-12-15/CMakeLists.txt

@@ -0,0 +1,3 @@
+include_directories(include)
+
+add_subdirectory(test)

week-15/task-12-15/include/emails.hpp

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <algorithm>
+#include <ranges>
+#include <regex>
+#include <string>
+#include <vector>
+
+std::vector<std::string> emails(const std::string& str) {
+    const std::regex pattern(R"(\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{1,}\b)");
+    std::vector<std::string> emails;
+    std::ranges::for_each(std::sregex_iterator(std::cbegin(str), std::cend(str), pattern),
+                          std::sregex_iterator(),
+                          [&emails](const auto& matches) { emails.push_back(matches[0]); });
+    return emails;
+}

week-15/task-12-15/test/CMakeLists.txt

@@ -0,0 +1 @@
+cpp_test(test-12-15.cpp)

week-15/task-12-15/test/test-12-15.cpp

@@ -0,0 +1,65 @@
+#include "emails.hpp"
+#include "gtest/gtest.h"
+
+TEST(EmailExtractionTest, EmptyInput) { EXPECT_EQ(emails(""), std::vector<std::string>({})); }
+
+TEST(EmailExtractionTest, NoEmailsInText) {
+    const std::string text = R"(
+        This is just regular text without any emails.
+        Some symbols: @hello, test@, @test.com
+        Numbers: 12345, random!text
+    )";
+    EXPECT_EQ(emails(text), std::vector<std::string>({}));
+}
+
+TEST(EmailExtractionTest, ValidEmails) {
+    const std::string text = R"(
+        Contact us at: [email protected] or [email protected].
+        Student emails: [email protected], [email protected]
+        Special cases: [email protected], [email protected]
+    )";
+    EXPECT_EQ(emails(text),
+              std::vector<std::string>({"[email protected]", "[email protected]",
+                                        "[email protected]", "[email protected]",
+                                        "[email protected]", "[email protected]"}));
+}
+
+TEST(EmailExtractionTest, InvalidEmails) {
+    const std::string text = R"(
+        Invalid formats:
+        plaintext
+        @missing.start
+        missing@at
+        double@@sign.com
+        invalid@chars_here.com
+        missing@tld.
+    )";
+    EXPECT_EQ(emails(text), std::vector<std::string>({}));
+}
+
+TEST(EmailExtractionTest, MixedContent) {
+    const std::string text = R"(
+        Valid: [email protected], [email protected]
+        Invalid: bad@email, @wrong.com
+        Almost valid: almost@valid. but with space
+        Trash: !@#$%^&*
+        Valid but tricky: "[email protected]" (should extract without quotes)
+    )";
+    EXPECT_EQ(emails(text), std::vector<std::string>(
+                                {"[email protected]", "[email protected]", "[email protected]"}));
+}
+
+TEST(EmailExtractionTest, EdgeCases) {
+    const std::string text = R"(
+        Minimal: [email protected]
+        Long domain: [email protected]
+        Special chars: [email protected]
+        Numbers: [email protected]
+        Hyphens: [email protected]
+        Quotes: "[email protected]"
+    )";
+    EXPECT_EQ(emails(text),
+              std::vector<std::string>({"[email protected]", "[email protected]",
+                                        "[email protected]", "[email protected]",
+                                        "[email protected]", "[email protected]"}));
+}