Skeleton

src/readme.txt

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+This directory contains the source code files (*.cpp, *.h)
+that you will write as you complete the assignment.
+We will also put any instructor-provided code here.

src/wordchain.cpp

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+#include <fstream>
+#include <iostream>
+#include <queue>
+#include <stack>
+#include <string>
+#include <unordered_set>
+
+const string ALPHABET = "abcdefghijklmnopqrstuvwxyz";
+
+const char *const FORMAT_UNDERSCORE = "\033[4m";
+const char *const END_FORMATTING = "\033[0m";
+const char *const DICTIONARY_PATH = "./dictionary.txt";
+
+std::string input(const char *message) {
+    if (message != nullptr)
+        std::cout << message;
+
+    std::cout << FORMAT_UNDERSCORE;
+    std::flush(std::cout);
+
+    std::string ret;
+    std::getline(std::cin, ret);
+    std::cout << END_FORMATTING;
+    return ret;
+}
+
+std::string fileRead(const std::string &filePath) {
+    std::ifstream file(filePath, std::ios::binary);
+    if (!file.is_open())
+        throw std::runtime_error("File couldn't be found");
+
+    std::string content;
+    const int BUF_LENGTH = 1024;
+    char buf[BUF_LENGTH];
+    while (file.read(buf, BUF_LENGTH))
+        content.append(buf, file.gcount());
+    content.append(buf, file.gcount());
+
+    if (!file.eof() && file.fail())
+        throw std::runtime_error("Error: Failed to read the file '" + filePath +
+                                 "'");
+
+    return content;
+}
+
+std::unordered_set<std::string> readDictionary() {
+    std::string fileContent = fileRead(DICTIONARY_PATH);
+    std::unordered_set<std::string> set;
+    size_t last = 0, idx;
+    while ((idx = fileContent.find('\n', last)) != std::string::npos) {
+        std::string sub = fileContent.substr(last, idx - last);
+        set.insert(sub);
+        last = idx + 1;
+    }
+
+    set.insert(fileContent.substr(last));
+    return set;
+}
+
+int main() {
+    std::cout << "Welcome to TDDD86 Word Chain.\n"
+              << "If you give me two English words, I will transform the\n"
+              << "first into the second by changing one letter at a time.\n\n"
+              <<"Please type two words: ";
+    std::flush(std::cout);
+
+    std::unordered_set<std::string> dictionary = readDictionary();
+    std::string userInput = input(nullptr);
+    size_t wordSep = userInput.find(' ');
+    std::string wordOne = userInput.substr(0, wordSep);
+    std::string wordTwo = userInput.substr(wordSep + 1);
+    std::cout << "Chain from " << wordTwo << " to " << wordOne << std::endl;
+
+    std::cout << "Have a nice day!" << std::endl;
+    return 0;
+}