chore: add some comments

src/interpret.rs

@@ -29,11 +29,11 @@ pub fn interpret(code: &str) -> Vec<u8> {
                 log::debug!("Read user input: {}", input_buf[0]);
             }
             '[' => {
-                // loop start
+                // skip loop
                 if memory[head] == 0 {
+                    // skip nested brackets and increment pc until the matching
+                    // closing bracket is found
                     let mut count_brackets = 1;
-
-                    // find nested brackets
                     while count_brackets > 0 {
                         pc += 1;
                         if pc >= code_bytes.len() {
@@ -48,6 +48,7 @@ pub fn interpret(code: &str) -> Vec<u8> {
                             _ => {}
                         }
                     }
+                // execute loop
                 } else {
                     // save pc to jump back to
                     log::info!("Pushing location {} onto loop stack", pc);
@@ -55,7 +56,7 @@ pub fn interpret(code: &str) -> Vec<u8> {
                 }
             }
             ']' => {
-                // loop terminator
+                // loop back
                 if memory[head] != 0 {
                     // jump back to loop beginning
                     if let Some(start_pc) = loop_stack.last() {
@@ -63,8 +64,8 @@ pub fn interpret(code: &str) -> Vec<u8> {
                     } else {
                         panic!("Loop stack empty, but still called!")
                     }
-                } else {
                 // loop done, continue normally
+                } else {
                     let location = loop_stack.pop();
                     log::info!("Done with loop at location {}", location.unwrap());
                 }