Add interpreter

src/interpreter.rs

@@ -0,0 +1,25 @@
+use crate::instructions::Instruction;
+use std::io::Read;
+
+pub fn run(instructions: &Vec<Instruction>, tape: &mut Vec<u8>, ptr: &mut usize) {
+  for instruction in instructions {
+    match instruction {
+      Instruction::Increment => tape[*ptr] += 1,
+      Instruction::Decrement => tape[*ptr] -= 1,
+      Instruction::MoveRight => *ptr += 1,
+      Instruction::MoveLeft => *ptr -= 1,
+      Instruction::Print => print!("{}", tape[*ptr] as char),
+      Instruction::Loop(nested) => {
+        while tape[*ptr] != 0 {
+          run(&nested, tape, ptr)
+        }
+      }
+      Instruction::Read => {
+        let mut input: [u8; 1] = [0; 1];
+        std::io::stdin()
+          .read_exact(&mut input)
+          .expect("failed to read stdin");
+      }
+    }
+  }
+}

src/main.rs

@@ -1,17 +1,21 @@
 mod instructions;
+mod interpreter;
 mod lexer;
 mod parser;
-use instructions::Instruction;
-use instructions::OpCode;
 
 fn main() {
-    let tokens: Vec<OpCode> = lexer::lex("+[-[.]-].");
-
-    let instructions: Vec<Instruction> = parser::parse(tokens);
-
-    for instruction in &instructions {
-        println!("{:?}", instruction);
+    let mut tape: Vec<u8> = vec![0; 1024];
+    for _i in 0..1024 {
+        tape.push(60);
     }
+    let mut ptr = 512;
+
+    interpreter::run(
+        &parser::parse(lexer::lex("++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.
+        ")),
+        &mut tape,
+        &mut ptr,
+    )
 }
 
 #[cfg(test)]