Add support for device declaration expressions

src/compiler/mod.rs

@@ -35,6 +35,7 @@ pub struct Compiler<'a> {
     /// Max stack size for the program is by default 512.
     variable_scope: Vec<HashMap<String, i32>>,
     function_locations: HashMap<String, usize>,
+    devices: HashMap<String, String>,
     output: &'a mut BufWriter<Box<dyn Write>>,
     current_line: usize,
     declared_main: bool,
@@ -46,6 +47,7 @@ impl<'a> Compiler<'a> {
             parser,
             variable_scope: Vec::new(),
             function_locations: HashMap::new(),
+            devices: HashMap::new(),
             output: writer,
             current_line: 0,
             declared_main: false,
@@ -122,6 +124,12 @@ impl<'a> Compiler<'a> {
             Expression::DeclarationExpression(var_name, expr) => {
                 self.declaration_expression(&var_name, *expr)?
             }
+            Expression::DeviceDeclarationExpression(DeviceDeclarationExpression {
+                name,
+                device,
+            }) => {
+                self.devices.insert(name, device);
+            }
             _ => todo!("{:?}", expression),
         };
 
@@ -250,7 +258,7 @@ impl<'a> Compiler<'a> {
                 }
                 _ => todo!("something is up with the arguments"),
             }
-            self.push_stack(&format!("{function_name}{iter_index}"))?;
+            self.push_stack(&format!("{function_name}Invocation{iter_index}"))?;
 
             iter_index += 1;
         }

src/parser/mod.rs

@@ -180,6 +180,10 @@ impl Parser {
             // match declarations with a `let` keyword
             TokenType::Keyword(Keyword::Let) => self.declaration()?,
 
+            TokenType::Keyword(Keyword::Device) => {
+                Expression::DeviceDeclarationExpression(self.device()?)
+            }
+
             // match functions with a `fn` keyword
             TokenType::Keyword(Keyword::Fn) => Expression::FunctionExpression(self.function()?),
 
@@ -258,6 +262,37 @@ impl Parser {
         }
     }
 
+    fn device(&mut self) -> Result<DeviceDeclarationExpression, ParseError> {
+        // sanity check, make sure current token is a `device` keyword
+
+        let current_token = token_from_option!(self.current_token);
+        if !self_matches_current!(self, TokenType::Keyword(Keyword::Device)) {
+            return Err(ParseError::UnexpectedToken(current_token.clone()));
+        }
+
+        let identifier = extract_token_data!(
+            token_from_option!(self.get_next()?),
+            TokenType::Identifier(ref id),
+            id.clone()
+        );
+
+        let current_token = token_from_option!(self.get_next()?).clone();
+        if !token_matches!(current_token, TokenType::Symbol(Symbol::Assign)) {
+            return Err(ParseError::UnexpectedToken(current_token));
+        }
+
+        let device = extract_token_data!(
+            token_from_option!(self.get_next()?),
+            TokenType::String(ref id),
+            id.clone()
+        );
+
+        Ok(DeviceDeclarationExpression {
+            name: identifier,
+            device,
+        })
+    }
+
     fn assignment(&mut self) -> Result<AssignmentExpression, ParseError> {
         let identifier = extract_token_data!(
             token_from_option!(self.current_token),

src/parser/tree_node.rs

@@ -144,6 +144,20 @@ pub enum LiteralOrVariable {
     Variable(String),
 }
 
+#[derive(Debug, PartialEq, Eq)]
+pub struct DeviceDeclarationExpression {
+    /// any variable-like name 
+    pub name: String,
+    /// The device port, ex. (db, d0, d1, d2, d3, d4, d5)
+    pub device: String,
+}
+
+impl std::fmt::Display for DeviceDeclarationExpression {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "(device {} = {})", self.name, self.device)
+    }
+}
+
 
 #[derive(Debug, PartialEq, Eq)]
 pub enum Expression {
@@ -159,6 +173,7 @@ pub enum Expression {
     PriorityExpression(Box<Expression>),
     ReturnExpression(Box<Expression>),
     Variable(String),
+    DeviceDeclarationExpression(DeviceDeclarationExpression),
 }
 
 impl std::fmt::Display for Expression {
@@ -176,6 +191,7 @@ impl std::fmt::Display for Expression {
             Expression::Variable(id) => write!(f, "{}", id),
             Expression::PriorityExpression(e) => write!(f, "({})", e),
             Expression::ReturnExpression(e) => write!(f, "(return {})", e),
+            Expression::DeviceDeclarationExpression(e) => write!(f, "{}", e),
         }
     }
 }

src/tokenizer/mod.rs

@@ -406,6 +406,7 @@ impl Tokenizer {
                 "enum" if next_ws!() => keyword!(Enum),
                 "import" if next_ws!() => keyword!(Import),
                 "export" if next_ws!() => keyword!(Export),
+                "device" if next_ws!() => keyword!(Device),
 
                 // boolean literals
                 "true" if next_ws!() => {

src/tokenizer/token.rs

@@ -164,6 +164,8 @@ pub enum Keyword {
     Fn,
     /// Represents the `if` keyword
     If,
+    /// Represents the `device` keyword. Useful for defining a device at a specific address (ex. d0, d1, d2, etc.)
+    Device,
     /// Represents the `else` keyword
     Else,
     /// Represents the `return` keyword