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src/eval.rs

@@ -3,19 +3,19 @@ pub fn do_math(arguments: String, operator: char) -> u32 {
 
     let num1: u32 = match split_args[0].parse() {
         Ok(num) => num,
-        Err(_e) => panic!("ArgumentError: Not a number: {}", split_args[0])
+        Err(_e) => panic!("ArgumentError: Not a number: {}", split_args[0]),
     };
 
     let num2: u32 = match split_args[1].parse() {
         Ok(num) => num,
-        Err(_e) => panic!("ArgumentError: Not a number: {}", split_args[1])
+        Err(_e) => panic!("ArgumentError: Not a number: {}", split_args[1]),
     };
-    
+
     match operator {
         '+' => num1 + num2,
         '-' => num1 - num2,
         '*' => num1 * num2,
         '/' => num1 / num2,
-        _ => panic!("SyntaxError: Unknown operator {}", operator)
+        _ => panic!("SyntaxError: Unknown operator {}", operator),
     }
-}
+}

src/main.rs

@@ -1,21 +1,21 @@
-use std::fs;
+use std::collections::HashMap;
 use std::env;
 use std::fmt;
+use std::fs;
 use std::usize;
-use std::collections::HashMap;
 
 mod eval;
 
 struct Program {
     data: Vec<String>,
     pc: usize,
-    vars: HashMap<char, String>
+    vars: HashMap<char, String>,
 }
 
 impl Program {
     fn from_string(program: String) -> Program {
         let mut op_list: Vec<String> = Vec::new();
-        
+
         for opcode in program.split("\n").collect::<Vec<&str>>() {
             let new_op = opcode.to_owned();
 
@@ -24,7 +24,11 @@ impl Program {
             }
         }
 
-        return Program{ data: op_list, pc: 0, vars: HashMap::new() };
+        return Program {
+            data: op_list,
+            pc: 0,
+            vars: HashMap::new(),
+        };
     }
 
     // Reads the arguments passed to an opcode, and inserts variables where necessary
@@ -40,28 +44,26 @@ impl Program {
             if index > 0 {
                 // Only test for the dollar sign if it's not the first character
                 // This is because there can't be anything before the first character, otherwise it's not the first
-                if argument_vec[index-1] == '$' {
+                if argument_vec[index - 1] == '$' {
                     // If the previous character is a dollar sign, we can skip this iteration because we know the variable has already been handled
                     continue;
                 }
             }
-            
+
             if current_char == '$' {
                 // If the current char is a $, we know that the next char should be a variable
-                let variable = argument_vec[index+1];
+                let variable = argument_vec[index + 1];
 
                 let key = self.vars.get(&variable);
                 match key {
                     Some(value) => str_to_push = value.to_string(),
-                    None => panic!("NotFoundError: Variable {} has not been defined", variable)
+                    None => panic!("NotFoundError: Variable {} has not been defined", variable),
                 }
-
             } else {
                 // If there's no variable, then just push the char that was already there
                 str_to_push = current_char.to_string();
             }
 
-
             builder.push_str(&str_to_push);
         }
 
@@ -88,8 +90,8 @@ 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),
-            '#' => {}, // Do nothing for comments
-            _ => panic!("SyntaxError: No such opcode: {}", self.pc)
+            '#' => {} // Do nothing for comments
+            _ => panic!("SyntaxError: No such opcode: {}", self.pc),
         }
     }
 
@@ -116,7 +118,7 @@ fn main() {
     // Grab args and a filename
     let args: Vec<String> = env::args().collect();
     if args.len() == 1 {
-        // Args will always have at least 1 argument, which is the name of the executable. 
+        // Args will always have at least 1 argument, which is the name of the executable.
         // That's why we're checking index 1, not index 0.
         panic!("You must provide a filename!");
     }
@@ -153,5 +155,4 @@ mod tests {
     fn test_undefined_variable() {
         make_program("p$v").run();
     }
-
-}
+}