Add HelloWorld.bfuck

CMakeLists.txt

@@ -9,6 +9,7 @@ include_directories(include)
 
 add_executable(bfuck
     src/main.cpp
+        src/lex.cpp
 )
 
 # target_link_libraries(lasm Boost::program_options)

HelloWorld.bfuck

@@ -0,0 +1 @@
+++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.+++.

include/lex.hpp

@@ -0,0 +1,16 @@
+#ifndef __LEX_H_
+#define __LEX_H_
+
+#include <string>
+
+/**
+ * @brief Lex a brainfuck file to a string from disk. Each element is a token.
+ * @param path The path to the file to be lexed
+ * @param tokens The string where the tokens will be written to
+ * @return True if the file was lexed successfully
+ */
+bool lex_brainfuck_file(const std::string &path, std::string &tokens);
+
+bool token_string_valid(std::string_view tokens);
+
+#endif

src/lex.cpp

@@ -0,0 +1,47 @@
+#include "lex.hpp"
+
+#include <iostream>
+#include <fstream>
+#include <algorithm>
+
+bool lex_brainfuck_file(const std::string &path, std::string &tokens) {
+    if (!tokens.empty()) {
+        std::cout << "Result string \"tokens\" has to be empty!" << std::endl;
+        return false;
+    }
+
+    std::ifstream input_stream;
+    input_stream.open(path, std::ios::in);
+    if (!input_stream.is_open()) {
+        std::cout << "Failed to open file \"" << path << "\"" << std::endl;
+        return false;
+    }
+
+    std::string line;
+    while (std::getline(input_stream, line)) {
+        tokens += line;
+    }
+
+    if (!input_stream.eof() && input_stream.fail()) {
+        std::cout << "Error reading from file \"" << path << "\"" << std::endl;
+        input_stream.close();
+        return false;
+    }
+    input_stream.close();
+
+    if (!token_string_valid(tokens)) {
+        std::cout << "Program is invalid!" << std::endl;
+        return false;
+    }
+
+    std::cout << "Lexed BrainFuck program:\n" << tokens << std::endl;
+    return true;
+}
+
+bool token_string_valid(const std::string_view tokens) {
+    std::string valid_tokens = "><+-.,[]";
+
+    return std::ranges::all_of(tokens.begin(), tokens.end(), [&valid_tokens](const char c){
+        return valid_tokens.find(c) != std::string::npos;
+    });
+}

src/main.cpp

@@ -1,5 +1,15 @@
+#include "lex.hpp"
+
 #include <iostream>
 
-int main() {
-    std::cout << "Hello, World!" << std::endl;
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        std::cout << "Usage: bfuck <IN-PATH>" << std::endl;
+    }
+    std::cout << "Running " << argv[1] << "...\n" << std::endl;
+
+    std::string tokens;
+    lex_brainfuck_file(argv[1], tokens);
+
+    return 0;
 }