refactored AST statements

parser/src/ast.rs

@@ -56,53 +56,55 @@ pub enum Postfix {
 
 #[derive(Debug, Clone, Serialize)]
 pub enum Statement {
-    // expr;
     Expression(Expression),
-
-    // { ... }
     Block(Block),
 
-    // let/const/var x = ...
+    VarDecl(VarDeclStmt),
-    VarDecl {
+    VarAssign(VarAssignStmt),
-        mutable: bool,
+    If(IfStmt),
-        name: String,
+    While(WhileStmt),
-        init: Option<Expression>,
+    For(ForStmt),
-        type_: Option<TypeExpr>,
-    },
 
-    VarAssign {
-        target: Expression,
-        value: Expression,
-    },
-
-    // if (...) stmt else stmt
-    If {
-        condition: Expression,
-        then_branch: Box<Statement>,
-        else_branch: Option<Box<Statement>>,
-    },
-
-    // while (...) stmt
-    While {
-        condition: Expression,
-        body: Box<Statement>,
-    },
-
-    // for (...) stmt
-    For {
-        init: (bool, String, Option<Expression>),
-        condition: Option<Expression>,
-        update: Option<Box<Statement>>,
-        body: Box<Statement>,
-    },
-
-    // return expr?;
     Return(Option<Expression>),
-
     Break,
     Continue,
 }
 
+#[derive(Debug, Clone, Serialize)]
+pub struct VarDeclStmt {
+    pub mutable: bool,
+    pub name: String,
+    pub init: Option<Expression>,
+    pub type_: Option<TypeExpr>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct VarAssignStmt {
+    pub target: Expression,
+    pub value: Expression,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct IfStmt {
+    pub condition: Expression,
+    pub then_branch: Box<Statement>,
+    pub else_branch: Option<Box<Statement>>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct WhileStmt {
+    pub condition: Expression,
+    pub body: Box<Statement>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct ForStmt {
+    pub init: (bool, String, Option<Expression>),
+    pub condition: Option<Expression>,
+    pub update: Option<Box<Statement>>,
+    pub body: Box<Statement>,
+}
+
 #[derive(Debug, Clone, Serialize)]
 pub enum Expression {
     Identifier(String),

parser/src/lib.rs

@@ -197,12 +197,12 @@ impl From<pest::iterators::Pair<'_, Rule>> for Statement {
                 let name = var_decl.next().unwrap().as_str().to_string();
                 let init = inner.next().map(Expression::from);
 
-                Statement::VarDecl {
+                Statement::VarDecl(VarDeclStmt {
                     mutable,
                     name: name.as_str().to_string(),
                     init,
                     type_,
-                }
+                })
             }
 
             Rule::return_stmt => {
@@ -225,11 +225,11 @@ impl From<pest::iterators::Pair<'_, Rule>> for Statement {
 
                 let else_branch = inner.next().map(Statement::from);
 
-                Statement::If {
+                Statement::If(IfStmt {
                     condition,
                     then_branch: Box::new(then_branch),
                     else_branch: else_branch.map(Box::new),
-                }
+                })
             }
 
             Rule::while_stmt => {
@@ -238,10 +238,10 @@ impl From<pest::iterators::Pair<'_, Rule>> for Statement {
                 let condition = Expression::from(inner.next().unwrap());
                 let body = Statement::from(inner.next().unwrap());
 
-                Statement::While {
+                Statement::While(WhileStmt {
                     condition,
                     body: Box::new(body),
-                }
+                })
             }
 
             _ => unimplemented!(

src/codegen.rs

@@ -1,4 +1,7 @@
-use parser::ast::{BinaryOp, Block, Expression, Postfix, Statement, TopLevel, TypeExpr};
+use parser::ast::{
+    BinaryOp, Block, Expression, IfStmt, Postfix, Statement, TopLevel, TypeExpr, VarAssignStmt,
+    VarDeclStmt, WhileStmt,
+};
 
 pub struct RustCodegen {
     output: String,
@@ -128,12 +131,12 @@ impl RustCodegen {
                 self.add_indentedln("}");
             }
 
-            Statement::VarDecl {
+            Statement::VarDecl(VarDeclStmt {
                 mutable,
                 name,
                 init,
                 type_,
-            } => {
+            }) => {
                 let mutability = if *mutable { "mut " } else { "" };
 
                 let ty = type_
@@ -149,7 +152,7 @@ impl RustCodegen {
                 self.add_indentedln(&format!("let {}{}{}{};", mutability, name, ty, init));
             }
 
-            Statement::VarAssign { target, value } => {
+            Statement::VarAssign(VarAssignStmt { target, value }) => {
                 self.add_indentedln(&format!(
                     "{} = {};",
                     self.generate_expression(target),
@@ -157,11 +160,11 @@ impl RustCodegen {
                 ));
             }
 
-            Statement::If {
+            Statement::If(IfStmt {
                 condition,
                 then_branch,
                 else_branch,
-            } => {
+            }) => {
                 self.add_indentedln(&format!("if {} {{", self.generate_expression(condition)));
 
                 self.indent += 1;
@@ -179,7 +182,7 @@ impl RustCodegen {
                 }
             }
 
-            Statement::While { condition, body } => {
+            Statement::While(WhileStmt { condition, body }) => {
                 self.add_indentedln(&format!("while {} {{", self.generate_expression(condition)));
 
                 self.indent += 1;