Adding 3rd homework - Brainfuck Interpreter (#44)

* Add 1st hw

* --amend

* moving readme for 1st hw to designated folder

* renamed TokenType enum to TokenClass

* fixed character constant lexing. added sampe output file

* add new line at end-of-file. added gitignore

* a bit of refactoring

* Add BF interpreter

1 files changed, 68 insertions, 0 deletions

diff --git a/homework/81568/BF_Interpreter/main.cpp b/homework/81568/BF_Interpreter/main.cpp
new file mode 100644
index 0000000..ccde7a5
--- /dev/null
+++ b/homework/81568/BF_Interpreter/main.cpp
@@ -0,0 +1,68 @@
+#include "bf_interpreter.h"
+#include "CLI11.hpp"
+
+#include <fstream>
+#include <iostream>
+#include <iterator>
+#include <sstream>
+#include <string>
+
+#define USAGE_MSG \
+  "Usage %s [-f <code file> | -c <code>] (-i <input file>) (-o <output file>)\n" \
+  "If no input/output file is provided standart input/output is used instead.\n"
+
+
+// TODO: implement proper CLI parsing
+// TODO: https://github.com/CLIUtils/CLI11
+int main(int argc, char **argv) {
+  CLI::App app {"Simple Brainfuck interpreter written for "
+                "IPL course homework from FMI, SU, 2018." };
+
+  std::string srcFile;
+  CLI::Option *srcFileOpt = app.add_option("-f,--file", srcFile, "Brainfuck source file");
+
+  srcFileOpt->check(CLI::ExistingFile);
+  
+  std::string srcCode;
+  CLI::Option *srcCodeOpt = app.add_option("-c,--code", srcCode, "Brainfuck source code");
+
+  srcFileOpt->excludes(srcCodeOpt);
+  srcCodeOpt->excludes(srcFileOpt);
+
+  std::string output;
+  CLI::Option *outputOpt = app.add_option("-o,--output", output, "File to write the Brainfuck output to. Optional.");
+
+  std::string input;
+  CLI::Option *inputOpt = app.add_option("-i,--input", input, "File to take the Brainfuck input from. Optional.");
+
+  inputOpt->check(CLI::ExistingFile);
+
+  CLI11_PARSE(app, argc, argv);
+
+  std::string source;
+  if (*srcFileOpt) {
+    std::ifstream file {srcFile};
+    if (file.is_open()) {
+      source.assign((std::istreambuf_iterator<char>(file)),
+                    std::istreambuf_iterator<char>());
+    }
+  } else {
+    source = srcCode;
+  }
+
+  std::ifstream inputFile;
+  if (*inputOpt)
+    inputFile.open(input);
+  
+  std::ofstream outputFile;
+  if (*outputOpt)
+    outputFile.open(output);  
+  
+  std::istream &is = *inputOpt ? inputFile : std::cin;
+  std::ostream &os = *outputOpt ? outputFile : std::cout;
+  
+  BFInterpreter bfi{source.c_str(), is, os};
+  bfi.compile();
+
+  return 0;
+}