Add ability to add functions

src/main.rs

@@ -10,6 +10,7 @@ struct Program {
     data: Vec<String>,
     pc: usize,
     vars: HashMap<char, String>,
+    funcs: HashMap<char, String>
 }
 
 impl Program {
@@ -28,6 +29,7 @@ impl Program {
             data: op_list,
             pc: 0,
             vars: HashMap::new(),
+            funcs: HashMap::new()
         };
     }
 
@@ -78,6 +80,16 @@ impl Program {
         self.vars.insert(name, value);
     }
 
+    fn add_func(&mut self, arguments: &str) {
+        let argument_vec: Vec<char> = arguments.chars().collect();
+        let name = argument_vec[0];
+        let body: String = argument_vec[1..].into_iter().collect();
+
+        self.funcs.insert(name, body);
+
+        println!("{:?}", self.funcs);
+    }
+
     fn parse(&mut self, instruction: &String) {
         // Opcode is the first character, arguments are everything after the first char
         let opcode = instruction.chars().collect::<Vec<char>>()[0];
@@ -90,6 +102,7 @@ impl Program {
             'm' => println!("{}", eval::do_math(self.args_or_vars(arguments), '*')),
             'd' => println!("{}", eval::do_math(self.args_or_vars(arguments), '/')),
             'l' => self.add_var(arguments),
+            'f' => self.add_func(arguments),
             '#' => {} // Do nothing for comments
             _ => panic!("SyntaxError: No such opcode: {}", self.pc),
         }