MAJOR refactoring and scopes

src/ast.rs

@@ -7,6 +7,7 @@ use std::collections::HashMap;
 pub struct Function {
     pub name: String,
     pub statements: Vec<Statement>,
+    pub n_args: u64,
     assembly: Option<String>,
 }
 
@@ -15,6 +16,7 @@ pub enum Statement {
     FunctionCall(String, Vec<ValueNode>),
     VariableDeclaration(String, ValueNode),
     VariableAssignment(String, ValueNode),
+    Scope(Vec<Statement>),
 }
 
 #[derive(Debug, Clone)]
@@ -46,10 +48,11 @@ pub trait Node {
 }
 
 impl Function {
-    pub fn new(name: String, statements: Vec<Statement>) -> Function {
+    pub fn new(name: String, n_args: u64, statements: Vec<Statement>) -> Function {
         Function {
             name,
             statements,
+            n_args,
             assembly: None,
         }
     }
@@ -74,8 +77,9 @@ fn get_default_functions() -> HashMap<String, Function> {
     functions.insert(
         "out".to_string(),
         Function {
-            name: "exit".to_string(),
+            name: "out".to_string(),
             statements: vec![],
+            n_args: 1,
             assembly: Some(
                 "
 out:
@@ -115,6 +119,7 @@ F-OUT   JMP           0xFF"
         Function {
             name: "exit".to_string(),
             statements: vec![],
+            n_args: 0,
             assembly: Some(
                 "
 exit:
@@ -165,13 +170,50 @@ F-OUT   JMP           0xFF
 impl Node for Statement {
     fn to_assembly(&self, state: &mut AssemblerState) -> String {
         match self {
+            Statement::Scope(statements) => {
+                let init_assembly = "
+ROM-OUT FLAGS-IN 0x00
+SE-OUT  A-IN     0xFF
+ROM-OUT B-IN     0x01
+ALU-OUT SE-IN    0xFF
+"
+                .to_string();
+
+                state.variables.push("start scope".to_string());
+
+                let statement_assembly = statements
+                    .iter()
+                    .map(|x| x.to_assembly(state))
+                    .collect::<Vec<String>>()
+                    .join("\n");
+
+                let mut stop_assembly = "".to_string();
+
+                while state.variables.contains(&"start scope".to_string()) {
+                    stop_assembly += &format!(
+                        "
+ROM-OUT FLAGS-IN 0x80
+SE-OUT  A-IN     0xFF
+ROM-OUT B-IN     0x01
+ALU-OUT SE-IN    0xFF
+ROM-OUT FLAGS-IN 0x00"
+                    );
+                    state.variables.pop();
+                }
+
+                format!(
+                    "{init_assembly}
+{statement_assembly}
+{stop_assembly}"
+                )
+            }
             Statement::FunctionCall(name, arguments) => {
                 if !state.functions.contains_key(name) {
                     todo!()
                 }
 
-                state.variables.push(name.to_owned());
 
+                state.variables.push(name.to_owned());
                 let argument_assembly: String = arguments
                     .into_iter()
                     .map(|x| x.to_assembly(state))
@@ -184,6 +226,10 @@ impl Node for Statement {
                     .map(char::from)
                     .collect();
 
+                for _ in 0..state.functions.get(name).unwrap().n_args {
+                    state.variables.pop();
+                }
+
                 state.variables.pop();
 
                 format!(
@@ -261,6 +307,8 @@ impl Node for ValueNode {
             ValueNode::Operator(o) => o.to_assembly(state),
             ValueNode::Variable(name) => {
                 if !state.variables.contains(name) {
+                    dbg!(&name);
+                    dbg!(&state.variables);
                     todo!();
                 }
 
@@ -268,7 +316,6 @@ impl Node for ValueNode {
                     - state.variables.iter().position(|x| x == name).unwrap()
                     - 1;
 
-                dbg!(&state.variables);
                 state.variables.push(name.to_owned());
 
                 format!(

src/parse.rs

@@ -4,20 +4,6 @@ use crate::ast::*;
 use crate::tokeniser::Keyword;
 use crate::tokeniser::Token;
 
-#[derive(Clone, Debug)]
-enum ParseState {
-    Function(Function),
-    Statement(Function),
-    None(Vec<Function>),
-}
-
-impl Function {
-    fn push_statement(&mut self, statement: Statement) -> Function {
-        self.statements.push(statement);
-        self.to_owned()
-    }
-}
-
 fn parse_math(tokens: &Vec<Token>) -> ValueNode {
     let mut prioritizing_order: HashMap<i64, HashSet<Token>> = HashMap::new();
     prioritizing_order.insert(0, HashSet::from([Token::Plus, Token::Minus]));
@@ -80,86 +66,77 @@ fn parse_math(tokens: &Vec<Token>) -> ValueNode {
     };
 }
 
-fn parse_statement(
+fn parse_statements(tokens: &Vec<Token>, starting_i: usize) -> (Vec<Statement>, usize) {
-    parse_state: &mut ParseState,
+    let mut i = starting_i;
-    i: &mut usize,
+    let mut statements = Vec::new();
-    tokens: &Vec<Token>,
+    while i < tokens.len() {
-    functions: &Vec<Function>,
+        statements.push(match &tokens[i] {
-) -> ParseState {
+            Token::OpenSquiglyBracket => {
-    let mut current_function = match parse_state {
+                let (statements, added_to_i) = parse_statements(tokens, i + 1);
-        ParseState::Statement(f) => f.to_owned(),
+                i = added_to_i + 1;
-        _ => todo!(),
+                Statement::Scope(statements)
-    };
-
-    if tokens[i.to_owned()] == Token::CloseSquiglyBracket {
-        let mut functions = functions.to_owned();
-        functions.push(current_function);
-
-        return ParseState::None(functions);
             }
-
-    let statement = match &tokens[i.to_owned()] {
             Token::Keyword(Keyword::Let) => {
-            *i += 1;
+                i += 1;
-            let name = match tokens[*i].clone() {
+                let name = match tokens[i].clone() {
                     Token::Identifier(identifier) => identifier,
                     _ => todo!(),
                 };
 
-            *i += 1;
+                i += 1;
-            match tokens[*i].clone() {
+                match tokens[i].clone() {
                     Token::Equals => {}
                     _ => todo!(),
                 };
 
-            *i += 1;
+                i += 1;
 
                 let mut declaration_tokens: Vec<Token> = Vec::new();
-            while tokens[*i] != Token::Semi {
+                while tokens[i] != Token::Semi {
-                declaration_tokens.push(tokens[*i].clone());
+                    declaration_tokens.push(tokens[i].clone());
-                *i += 1;
+                    i += 1;
                 }
                 Statement::VariableDeclaration(name, parse_math(&declaration_tokens))
             }
             Token::Keyword(Keyword::Assign) => {
-            *i += 1;
+                i += 1;
-            let name = match tokens[*i].clone() {
+                let name = match tokens[i].clone() {
                     Token::Identifier(identifier) => identifier,
                     _ => todo!(),
                 };
 
-            *i += 1;
+                i += 1;
-            match tokens[*i].clone() {
+                match tokens[i].clone() {
                     Token::Equals => {}
                     _ => todo!(),
                 };
 
-            *i += 1;
+                i += 1;
 
                 let mut declaration_tokens: Vec<Token> = Vec::new();
-            while tokens[*i] != Token::Semi {
+                while tokens[i] != Token::Semi {
-                declaration_tokens.push(tokens[*i].clone());
+                    declaration_tokens.push(tokens[i].clone());
-                *i += 1;
+                    i += 1;
                 }
                 Statement::VariableAssignment(name, parse_math(&declaration_tokens))
             }
             Token::Identifier(identifier) => {
-            *i += 1;
+                i += 1;
 
                 let mut declaration_tokens: Vec<Vec<Token>> = Vec::new();
 
-            *i += 1;
+                i += 1;
-            while tokens[*i] != Token::CloseParanthesis {
+                while tokens[i] != Token::CloseParanthesis {
                     let mut argument_tokens: Vec<Token> = Vec::new();
-                while tokens[*i] != Token::Comma {
+                    while tokens[i] != Token::Comma {
-                    argument_tokens.push(tokens[*i].clone());
+                        argument_tokens.push(tokens[i].clone());
-                    *i += 1;
+                        i += 1;
                     }
                     declaration_tokens.push(argument_tokens);
-                *i += 1;
+                    i += 1;
                 }
 
-            *i += 1;
+                i += 1;
 
                 let mut arguments: Vec<ValueNode> = Vec::new();
 
@@ -172,53 +149,52 @@ fn parse_statement(
 
                 Statement::FunctionCall(identifier.to_owned(), arguments)
             }
+            Token::CloseSquiglyBracket => {
+                return (statements, i);
+            }
+            Token::Semi => {
+                i += 1;
+                continue;
+            }
             _other => {
+                dbg!(_other);
                 todo!()
             }
-    };
+        });
-
+    }
-    current_function.push_statement(statement);
+    (statements, i)
-
-    return ParseState::Statement(current_function);
 }
 
 pub fn ast(tokens: Vec<Token>) -> Vec<Function> {
-    let mut parse_state = ParseState::None(Vec::new());
     let mut functions: Vec<Function> = Vec::new();
 
     let mut i = 0;
     while i < tokens.len() {
-        parse_state = match &parse_state {
-            ParseState::None(funcs) => {
-                functions = funcs.to_owned();
-                // Expect function and shit
         match &tokens[i] {
-                    Token::Keyword(keyword) => match keyword {
+            Token::Keyword(Keyword::Function) => {
-                        Keyword::Function => {
+                let (statements, added_to_i) = parse_statements(&tokens, i + 4);
-                            ParseState::Function(Function::new("".to_string(), Vec::new()))
+                let statements = vec![Statement::Scope(statements)];
-                        }
+                let function_name = match &tokens[i + 1] {
+                    Token::Identifier(identifier) => identifier.to_owned(),
                     _ => todo!(),
-                    },
+                };
+                let n_args = match &tokens[i + 2] {
+                    Token::Number(num) => num.parse::<u64>().unwrap(),
                     _ => todo!(),
+                };
+                i += added_to_i;
+                functions.push(Function::new(function_name, n_args, statements));
             }
-            }
+            _other => {
-            ParseState::Function(func) => match &tokens[i] {
+                dbg!(&functions);
-                Token::Identifier(identifier) => {
+                dbg!(i);
-                    ParseState::Function(Function::new(identifier.to_owned(), Vec::new()))
+                dbg!(_other);
-                }
+                todo!();
-                Token::OpenSquiglyBracket => ParseState::Statement(func.to_owned()),
-                _ => todo!(),
-            },
-            ParseState::Statement(_function) => {
-                parse_statement(&mut parse_state, &mut i, &tokens, &functions)
             }
         };
 
         i += 1;
     }
 
-    match parse_state {
+    functions
-        ParseState::None(v) => v,
-        _ => todo!(),
-    }
 }

src/tokeniser.rs

@@ -20,6 +20,7 @@ pub enum Keyword {
     Function,
     Let,
     Assign,
+    If,
 }
 
 enum TokenFinishedUnfinished {
@@ -39,6 +40,7 @@ fn generate_keyword_map() -> HashMap<String, Keyword> {
     keywords.insert("fn".to_string(), K::Function);
     keywords.insert("let".to_string(), K::Let);
     keywords.insert("assign".to_string(), K::Assign);
+    keywords.insert("if".to_string(), K::If);
 
     keywords
 }