Merge pull request #19 from mist-go/expressions

Expressions

parser/src/ast.rs

@@ -47,7 +47,7 @@ pub enum BinaryOp {
 
 #[derive(Debug, Clone, Serialize)]
 pub enum TopLevel {
-    Import(String),
+    Include(StaticPath),
     StructDecl {
         export: bool,
         name: String,
@@ -66,11 +66,19 @@ pub enum TopLevel {
 pub enum Postfix {
     FieldAccess(String),
     Call(Vec<Expression>),
+    MacroCall(String),
     StructCall(HashMap<String, Expression>),
     Index(Expression),
     Binary(BinaryOp, Expression),
 }
 
+#[derive(Debug, Clone, Serialize)]
+pub enum Prefix {
+    Ref,
+    RefMut,
+    Deref,
+}
+
 #[derive(Debug, Clone, Serialize)]
 pub enum Statement {
     Expression(Expression),
@@ -134,8 +142,10 @@ pub enum Expression {
     FloatLiteral(f64),
     BoolLiteral(bool),
     StringLiteral(String),
-    Postfix {
+    TupleLiteral(Vec<Expression>),
+    Fix {
         initial: Box<Expression>,
+        prefixes: Vec<Prefix>,
         postfixes: Vec<Postfix>,
     },
 }

parser/src/grammar.pest

@@ -9,18 +9,19 @@ integer     = @{ ASCII_DIGIT+ }
 float       = @{ ASCII_DIGIT+ ~ "." ~ ASCII_DIGIT+ }
 boolean     =  { "true" | "false" }
 string_lit  =  { "\"" ~ inner_str ~ "\"" }
-inner_str   = @{ (!"\"" ~ ANY)* }
+inner_str   = @{ (!"\"" ~ ("\\\"" | ANY))* }
 static_path =  { identifier ~ ("::" ~ identifier)* }
 
 export   =  { "public" }
 mutable  =  { "mut" }
+sharp    = _{ "#" }
 var_decl =  { type_expr ~ mutable? ~ identifier }
 
 // ================= TOP LEVEL =================
 
 top_level = _{ import | function_decl | struct_decl }
 
-import = { "import" ~ string_lit ~ ";" }
+import = { sharp ~ "include" ~ "<" ~ static_path ~ ">" }
 
 field_list = { field ~ ("," ~ field)* ~ ","? }
 field      = { export? ~ type_expr ~ identifier }
@@ -44,6 +45,7 @@ statement_list = { statement* }
 statement = _{
     expr_stmt
   | var_decl_statement
+  | assign_statement
   | if_stmt
   | while_stmt
   | return_stmt
@@ -64,6 +66,8 @@ continue_stmt = { "continue" ~ ";" }
 
 var_decl_statement = { var_decl ~ ("=" ~ expr)? ~ ";" }
 
+assign_statement = { expr ~ "=" ~ expr ~ ";" }
+
 if_stmt = {
     "if" ~ "(" ~ expr ~ ")" ~ statement ~ ("else" ~ statement)?
 }
@@ -78,17 +82,26 @@ path_type  = { static_path ~ ("<" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ">")? }
 ref_type   = { mutable? ~ "*" }
 type_expr  = { (path_type | tuple_type) ~ ref_type* }
 
+macro_inner_v = {
+    "(" ~ macro_inner_v* ~ ")"
+  | (!("(" | ")") ~ ANY)
+}
+
+tuple = { "(" ~ (expr ~ ("," ~ expr)*)? ~ ")" }
+
 primary = {
     integer
   | float
   | boolean
   | string_lit
   | static_path
+  | tuple
 }
 
 postfix = {
     field_px
   | call_px
+  | macro_call_px
   | struct_px
   | index_px
   | binary_px
@@ -96,12 +109,23 @@ postfix = {
 
 field_px          = { "." ~ identifier }
 call_px           = { "(" ~ (expr ~ ("," ~ expr)*)? ~ ")" }
+macro_call_px     = { "!" ~ "(" ~ macro_inner_v* ~ ")" }
 struct_px         = { "{" ~ (struct_field_decl ~ ("," ~ struct_field_decl)*)? ~ "}" }
 index_px          = { "[" ~ expr ~ "]" }
 binary_px         = { bin_op ~ expr }
 bin_op            = { "+" | "-" | "*" | "/" | "%" | "==" | "!=" | "<" | ">" | "<=" | ">=" }
 struct_field_decl = { identifier ~ ":" ~ expr }
 
+prefix = {
+    deref_px
+  | mut_ref_px
+  | ref_px
+}
+
+deref_px   = { "*" }
+mut_ref_px = { "&" ~ mutable }
+ref_px     = { "&" }
+
 expr = {
-    primary ~ postfix*
+    prefix* ~ primary ~ postfix*
 }

parser/src/lib.rs

@@ -28,42 +28,45 @@ pub fn parse(source: &str) -> Result<Vec<TopLevel>, ParseError> {
 
 impl From<pest::iterators::Pair<'_, Rule>> for TypeExpr {
     fn from(pair: pest::iterators::Pair<'_, Rule>) -> Self {
-        match pair.as_rule() {
+        let rule = pair.as_rule();
-            Rule::type_expr => {
         let mut inner = pair.into_inner();
-                TypeExpr(
+
+        match rule {
+            Rule::type_expr => TypeExpr(
                 TypeExprKind::from(inner.next().unwrap()),
                 inner.map(TypePostfix::from).collect(),
-                )
+            ),
-            }
+            _ => unimplemented!("{rule:#?}"),
-            _ => unimplemented!("{pair:#?}"),
         }
     }
 }
 
 impl From<pest::iterators::Pair<'_, Rule>> for TypePostfix {
     fn from(pair: pest::iterators::Pair<'_, Rule>) -> Self {
-        match pair.as_rule() {
+        let rule = pair.as_rule();
+        let inner = pair.into_inner();
+
+        match rule {
             Rule::ref_type => {
-                if pair.into_inner().peek().is_some() {
+                if inner.peek().is_some() {
                     TypePostfix::RefMut
                 } else {
                     TypePostfix::Ref
                 }
             }
-            _ => unimplemented!("{pair:#?}"),
+            _ => unimplemented!("{rule:#?}"),
         }
     }
 }
 
 impl From<pest::iterators::Pair<'_, Rule>> for TypeExprKind {
     fn from(pair: pest::iterators::Pair<'_, Rule>) -> Self {
-        match pair.as_rule() {
+        let rule = pair.as_rule();
-            Rule::tuple_type => {
-                TypeExprKind::Tuple(pair.into_inner().map(TypeExpr::from).collect())
-            }
-            Rule::path_type => {
         let mut inner = pair.into_inner();
+
+        match rule {
+            Rule::tuple_type => TypeExprKind::Tuple(inner.map(TypeExpr::from).collect()),
+            Rule::path_type => {
                 let path = StaticPath::from(inner.next().unwrap());
                 let params = inner.map(TypeExpr::from).collect::<Vec<_>>();
 
@@ -73,7 +76,7 @@ impl From<pest::iterators::Pair<'_, Rule>> for TypeExprKind {
                     TypeExprKind::PathParams(path, params)
                 }
             }
-            _ => unimplemented!("{pair:#?}"),
+            _ => unimplemented!("{rule:#?}"),
         }
     }
 }
@@ -113,23 +116,20 @@ impl From<pest::iterators::Pair<'_, Rule>> for FieldList {
 
 impl From<pest::iterators::Pair<'_, Rule>> for ParamList {
     fn from(pair: pest::iterators::Pair<Rule>) -> Self {
-        let params = pair.into_inner().map(VarDecl::from).collect();
+        ParamList(pair.into_inner().map(VarDecl::from).collect())
-
-        ParamList(params)
     }
 }
 
 impl TryFrom<pest::iterators::Pair<'_, Rule>> for TopLevel {
     type Error = ();
     fn try_from(pair: pest::iterators::Pair<Rule>) -> Result<Self, ()> {
-        match pair.as_rule() {
+        let rule = pair.as_rule();
-            Rule::import => {
-                let path = pair.into_inner().next().unwrap().as_str().to_string();
-                Ok(TopLevel::Import(path))
-            }
-            Rule::function_decl => {
         let mut inner = pair.into_inner();
 
+        match rule {
+            Rule::import => Ok(TopLevel::Include(StaticPath::from(inner.next().unwrap()))),
+
+            Rule::function_decl => {
                 let export = if let Some(first) = inner.peek() {
                     if first.as_rule() == Rule::export {
                         inner.next();
@@ -162,7 +162,6 @@ impl TryFrom<pest::iterators::Pair<'_, Rule>> for TopLevel {
             }
 
             Rule::struct_decl => {
-                let mut inner = pair.into_inner();
                 let export = if let Some(first) = inner.peek() {
                     if first.as_rule() == Rule::export {
                         inner.next();
@@ -185,7 +184,7 @@ impl TryFrom<pest::iterators::Pair<'_, Rule>> for TopLevel {
             }
 
             Rule::EOI => Err(()),
-            _ => unimplemented!("TopLevel parsing not implemented yet {:?}", pair.as_rule()),
+            _ => unimplemented!("{rule:#?}"),
         }
     }
 }
@@ -208,24 +207,19 @@ impl From<pest::iterators::Pair<'_, Rule>> for Block {
 
 impl From<pest::iterators::Pair<'_, Rule>> for Statement {
     fn from(pair: pest::iterators::Pair<Rule>) -> Self {
-        match pair.as_rule() {
+        let rule = pair.as_rule();
-            Rule::statement => {
+        let mut inner = pair.clone().into_inner();
-                let inner = pair.into_inner().next().unwrap();
-                Statement::from(inner)
-            }
 
-            Rule::expr_stmt => {
+        match rule {
-                let expr_pair = pair.into_inner().next().unwrap();
+            Rule::statement => Statement::from(inner.next().unwrap()),
-                Statement::Expression(Expression::from(expr_pair))
-            }
 
-            Rule::block => Statement::Block(Block::from(pair.into_inner().next().unwrap())),
+            Rule::expr_stmt => Statement::Expression(Expression::from(inner.next().unwrap())),
+
+            Rule::block => Statement::Block(Block::from(inner.next().unwrap())),
 
             Rule::var_decl_statement => Statement::VarDecl(VarDeclStmt::from(pair)),
 
             Rule::return_stmt => {
-                let mut inner = pair.into_inner();
-
                 let expr = inner.next().map(Expression::from);
 
                 Statement::Return(expr)
@@ -236,8 +230,6 @@ impl From<pest::iterators::Pair<'_, Rule>> for Statement {
             Rule::continue_stmt => Statement::Continue,
 
             Rule::if_stmt => {
-                let mut inner = pair.into_inner();
-
                 let condition = Expression::from(inner.next().unwrap());
                 let then_branch = Statement::from(inner.next().unwrap());
 
@@ -251,8 +243,6 @@ impl From<pest::iterators::Pair<'_, Rule>> for Statement {
             }
 
             Rule::while_stmt => {
-                let mut inner = pair.into_inner();
-
                 let condition = Expression::from(inner.next().unwrap());
                 let body = Statement::from(inner.next().unwrap());
 
@@ -262,71 +252,86 @@ impl From<pest::iterators::Pair<'_, Rule>> for Statement {
                 })
             }
 
-            _ => unimplemented!(
+            Rule::assign_statement => Statement::VarAssign(VarAssignStmt {
-                "Statement parsing not implemented yet: {:?}",
+                target: Expression::from(inner.next().unwrap()),
-                pair.as_rule()
+                value: Expression::from(inner.next().unwrap()),
-            ),
+            }),
+
+            _ => unimplemented!("{rule:#?}"),
         }
     }
 }
 
 impl From<pest::iterators::Pair<'_, Rule>> for Expression {
     fn from(pair: pest::iterators::Pair<Rule>) -> Self {
-        match pair.as_rule() {
+        let rule = pair.as_rule();
+        let mut inner = pair.clone().into_inner();
+
+        match rule {
             Rule::expr => {
-                let mut inner = pair.into_inner();
+                let mut prefixes = Vec::new();
+
+                while inner
+                    .peek()
+                    .map(|v| v.as_rule() == Rule::prefix)
+                    .unwrap_or_default()
+                {
+                    prefixes.push(Prefix::from(inner.next().unwrap()));
+                }
+
                 let exp = Expression::from(inner.next().unwrap());
 
-                if inner.len() > 0 {
+                if inner.len() > 0 || prefixes.len() > 0 {
-                    Expression::Postfix {
+                    Expression::Fix {
                         initial: Box::new(exp),
+                        prefixes,
                         postfixes: inner.map(|p| Postfix::from(p)).collect(),
                     }
                 } else {
                     exp
                 }
             }
-            Rule::primary => Expression::from(pair.into_inner().next().unwrap()),
+            Rule::primary => Expression::from(inner.next().unwrap()),
             Rule::static_path => Expression::Path(StaticPath::from(pair)),
-            Rule::integer => {
+            Rule::integer => Expression::IntLiteral(pair.as_str().parse::<i64>().unwrap()),
-                let value = pair.as_str().parse::<i64>().unwrap();
+            Rule::float => Expression::FloatLiteral(pair.as_str().parse::<f64>().unwrap()),
-                Expression::IntLiteral(value)
+            Rule::boolean => Expression::BoolLiteral(pair.as_str().parse::<bool>().unwrap()),
+            Rule::string_lit => Expression::StringLiteral(inner.as_str().to_string()),
+            Rule::tuple => Expression::TupleLiteral(inner.map(Expression::from).collect()),
+            _ => unimplemented!("{rule:#?}"),
         }
-            Rule::float => {
-                let value = pair.as_str().parse::<f64>().unwrap();
-                Expression::FloatLiteral(value)
     }
-            Rule::boolean => {
-                let value = pair.as_str().parse::<bool>().unwrap();
-                Expression::BoolLiteral(value)
-            }
-            Rule::string_lit => {
-                let inner_str = pair.into_inner().next().unwrap().as_str();
-                Expression::StringLiteral(inner_str.to_string())
 }
 
-            _ => unimplemented!(
+impl From<pest::iterators::Pair<'_, Rule>> for Prefix {
-                "Expression parsing not implemented yet {:?}",
+    fn from(pair: pest::iterators::Pair<Rule>) -> Self {
-                pair.as_rule()
+        match pair.as_rule() {
-            ),
+            Rule::prefix => Self::from(pair.into_inner().next().unwrap()),
+            Rule::deref_px => Self::Deref,
+            Rule::mut_ref_px => Self::RefMut,
+            Rule::ref_px => Self::Ref,
+            _ => unimplemented!("{pair:#?}"),
         }
     }
 }
 
 impl From<pest::iterators::Pair<'_, Rule>> for Postfix {
     fn from(pair: pest::iterators::Pair<Rule>) -> Self {
-        match pair.as_rule() {
+        let rule = pair.as_rule();
-            Rule::postfix => Postfix::from(pair.into_inner().next().unwrap()),
+        let mut inner = pair.into_inner();
+
+        match rule {
+            Rule::postfix => Postfix::from(inner.next().unwrap()),
 
             Rule::field_px => {
-                let field_name = pair.into_inner().next().unwrap().as_str().to_string();
+                let field_name = inner.next().unwrap().as_str().to_string();
                 Postfix::FieldAccess(field_name)
             }
 
-            Rule::call_px => Postfix::Call(pair.into_inner().map(Expression::from).collect()),
+            Rule::call_px => Postfix::Call(inner.map(Expression::from).collect()),
 
             Rule::struct_px => Postfix::StructCall(
-                pair.into_inner()
+                inner
                     .map(|p| {
                         let mut pi = p.into_inner();
                         (
@@ -337,10 +342,9 @@ impl From<pest::iterators::Pair<'_, Rule>> for Postfix {
                     .collect(),
             ),
 
-            Rule::index_px => Postfix::Index(Expression::from(pair.into_inner().next().unwrap())),
+            Rule::index_px => Postfix::Index(Expression::from(inner.next().unwrap())),
 
             Rule::binary_px => {
-                let mut inner = pair.into_inner();
                 let op_pair = inner.next().unwrap();
                 let op = match op_pair.as_str() {
                     "+" => BinaryOp::Plus,
@@ -362,7 +366,9 @@ impl From<pest::iterators::Pair<'_, Rule>> for Postfix {
                 Postfix::Binary(op, Expression::from(inner.next().unwrap()))
             }
 
-            _ => unimplemented!("Postfix parsing not implemented yet {:?}", pair.as_rule()),
+            Rule::macro_call_px => Postfix::MacroCall(inner.as_str().to_string()),
+
+            _ => unimplemented!("{rule:#?}"),
         }
     }
 }

src/codegen.rs

@@ -1,6 +1,6 @@
 use parser::ast::{
-    BinaryOp, Block, Expression, IfStmt, Postfix, Statement, StaticPath, TopLevel, TypeExpr,
+    BinaryOp, Block, Expression, IfStmt, Postfix, Prefix, Statement, StaticPath, TopLevel,
-    TypeExprKind, TypePostfix, VarAssignStmt, VarDecl, VarDeclStmt, WhileStmt,
+    TypeExpr, TypeExprKind, TypePostfix, VarAssignStmt, VarDecl, VarDeclStmt, WhileStmt,
 };
 
 // ---------------------------------------------------------------------------
@@ -112,28 +112,46 @@ impl GetRust for Expression {
             Expression::IntLiteral(n) => n.to_string(),
             Expression::FloatLiteral(n) => n.to_string(),
             Expression::BoolLiteral(b) => b.to_string(),
-            Expression::StringLiteral(s) => format!("\"{}\".to_string()", s),
+            Expression::StringLiteral(s) => format!("\"{s}\""),
-
+            Expression::TupleLiteral(t) => {
-            Expression::Postfix { initial, postfixes } => {
+                format!(
-                let base = initial.get_rust();
+                    "({})",
-                postfixes.get_rust_with_base(&base)
+                    t.iter()
+                        .map(Expression::get_rust)
+                        .collect::<Vec<_>>()
+                        .join(", ")
+                )
             }
+            Expression::Fix {
+                initial,
+                prefixes,
+                postfixes,
+            } => prefixes.get_rust() + &initial.get_rust() + &postfixes.get_rust(),
         }
     }
 }
 
-/// Helper — applies a slice of postfixes onto an already-rendered base string.
+impl GetRust for Prefix {
-trait PostfixChain {
+    fn get_rust(&self) -> String {
-    fn get_rust_with_base(&self, base: &str) -> String;
+        match self {
+            Self::Deref => "*",
+            Self::Ref => "&",
+            Self::RefMut => "&mut ",
+        }
+        .to_string()
+    }
 }
 
-impl PostfixChain for [Postfix] {
+impl GetRust for [Prefix] {
-    fn get_rust_with_base(&self, base: &str) -> String {
+    fn get_rust(&self) -> String {
-        let mut result = base.to_string();
+        self.iter().map(Prefix::get_rust).collect()
+    }
+}
 
-        for postfix in self {
+impl GetRust for Postfix {
-            result = match postfix {
+    fn get_rust(&self) -> String {
-                Postfix::FieldAccess(field) => format!("{}.{}", result, field),
+        match self {
+            Postfix::FieldAccess(field) => format!(".{}", field),
 
             Postfix::Call(args) => {
                 let args = args
@@ -141,7 +159,11 @@ impl PostfixChain for [Postfix] {
                     .map(|a| a.get_rust())
                     .collect::<Vec<_>>()
                     .join(", ");
-                    format!("{}({})", result, args)
+                format!("({})", args)
+            }
+
+            Postfix::MacroCall(inner) => {
+                format!("!({})", inner)
             }
 
             Postfix::StructCall(fields) => {
@@ -150,11 +172,11 @@ impl PostfixChain for [Postfix] {
                     .map(|(k, v)| format!("{}: {}", k, v.get_rust()))
                     .collect::<Vec<_>>()
                     .join(", ");
-                    format!("{} {{ {} }}", result, fields)
+                format!("{{ {} }}", fields)
             }
 
             Postfix::Index(idx) => {
-                    format!("{}[{}]", result, idx.get_rust())
+                format!("[{}]", idx.get_rust())
             }
 
             Postfix::Binary(op, rhs) => {
@@ -171,12 +193,15 @@ impl PostfixChain for [Postfix] {
                     BinaryOp::LessThanOrEqual => "<=",
                     BinaryOp::GreaterThanOrEqual => ">=",
                 };
-                    format!("{} {} {}", result, op_str, rhs.get_rust())
+                format!("{} {}", op_str, rhs.get_rust())
+            }
+        }
     }
-            };
 }
 
-        result
+impl GetRust for [Postfix] {
+    fn get_rust(&self) -> String {
+        self.iter().map(Postfix::get_rust).collect()
     }
 }
 
@@ -195,9 +220,8 @@ impl ToRust for Block {
 impl ToRust for TopLevel {
     fn to_rust(&self, cg: &mut RustCodegen) {
         match self {
-            TopLevel::Import(path) => {
+            TopLevel::Include(path) => {
-                let path = path.replace('"', "");
+                cg.addln(&format!("use {};", path.get_rust()));
-                cg.addln(&format!("use {};", path));
             }
 
             TopLevel::StructDecl {

test/src/main.mist

@@ -1 +1,3 @@
-i32 add(i32* a, i32* b) {}
+void main() {
+    (i32, i32, str*) my_tuple = (10, 20, "hello, world");
+}