moved into seperate crates

crates/machine/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "machine"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

crates/machine/src/lib.rs

@@ -0,0 +1,2 @@
+#[allow(dead_code)]
+mod model;

crates/machine/src/model.rs

@@ -0,0 +1,82 @@
+pub struct OperandStack {
+    vec: Vec<u32>,
+}
+
+impl OperandStack {
+    pub fn new() -> OperandStack {
+        OperandStack { vec: vec![] }
+    }
+
+    pub fn pop(&mut self) -> u32 {
+        self.vec.pop().unwrap()
+    }
+
+    pub fn push(&mut self, n: u32) {
+        self.vec.push(n);
+    }
+
+    pub fn swap(&mut self) {
+        let len = self.vec.len();
+        self.vec.swap(len - 1, len - 2);
+    }
+}
+
+pub struct LocalVariables {
+    vec: Vec<u32>,
+}
+
+impl LocalVariables {
+    pub fn new(size: usize) -> LocalVariables {
+        LocalVariables { vec: vec![0; size] }
+    }
+
+    pub fn store(&mut self, address: u8, value: u32) {
+        self.vec.insert(address as usize, value);
+    }
+
+    pub fn store2(&mut self, address: u8, value1: u32, value2: u32) {
+        self.vec.insert(address as usize, value1);
+        self.vec.insert(address as usize + 1, value2);
+    }
+
+    pub fn load(&self, address: u8) -> u32 {
+        self.vec[address as usize]
+    }
+    pub fn load2(&self, address: u8) -> (u32, u32) {
+        (self.vec[address as usize], self.vec[address as usize + 1])
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{LocalVariables, OperandStack};
+
+    #[test]
+    fn operand_stack() {
+        let mut stack = OperandStack::new();
+
+        stack.push(10);
+        stack.push(20);
+        stack.push(30);
+        stack.push(40);
+        stack.swap();
+
+        assert_eq!(stack.pop(), 30);
+        assert_eq!(stack.pop(), 40);
+        assert_eq!(stack.pop(), 20);
+        assert_eq!(stack.pop(), 10);
+    }
+
+    #[test]
+    fn local_vars() {
+        let mut vars = LocalVariables::new(10);
+
+        vars.store(1, 546);
+        vars.store(2, 100);
+        vars.store2(3, 100, 466);
+
+        assert_eq!(vars.load(1), 546);
+        assert_eq!(vars.load(3), 100);
+        assert_eq!(vars.load(4), 466);
+    }
+}