Implement for loops

examples/for_loop.ds

@@ -0,0 +1,3 @@
+for i in [1 2 3] {
+	(output i)
+}

examples/while_loop.ds

@@ -0,0 +1,6 @@
+i = 0
+
+while i < 10 {
+	(output i)
+	i += 1
+}

src/abstract_tree/for.rs

@@ -0,0 +1,45 @@
+use serde::{Deserialize, Serialize};
+
+use crate::{AbstractTree, Expression, Identifier, Item, Value};
+
+#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
+pub struct For {
+    identifier: Identifier,
+    expression: Expression,
+    item: Item,
+}
+
+impl AbstractTree for For {
+    fn from_syntax_node(source: &str, node: tree_sitter::Node) -> crate::Result<Self> {
+        let identifier_node = node.child(1).unwrap();
+        let identifier = Identifier::from_syntax_node(source, identifier_node)?;
+
+        let expression_node = node.child(3).unwrap();
+        let expression = Expression::from_syntax_node(source, expression_node)?;
+
+        let item_node = node.child(5).unwrap();
+        let item = Item::from_syntax_node(source, item_node)?;
+
+        Ok(For {
+            identifier,
+            expression,
+            item,
+        })
+    }
+
+    fn run(&self, source: &str, context: &mut crate::VariableMap) -> crate::Result<crate::Value> {
+        let value = self.expression.run(source, context)?;
+        let list = value.as_list()?;
+        let key = self.identifier.inner();
+
+        for value in list {
+            context.set_value(key.clone(), value.clone())?;
+
+            self.item.run(source, context)?;
+        }
+
+        context.set_value(key.clone(), Value::Empty)?;
+
+        Ok(Value::Empty)
+    }
+}

src/abstract_tree/mod.rs

@@ -9,6 +9,7 @@
 pub mod assignment;
 pub mod r#async;
 pub mod expression;
+pub mod r#for;
 pub mod function_call;
 pub mod identifier;
 pub mod if_else;
@@ -23,7 +24,7 @@ pub mod r#while;
 
 pub use {
     assignment::*, expression::*, function_call::*, identifier::*, if_else::*, item::*, logic::*,
-    math::*, r#match::*, statement::*,
+    math::*, r#async::*, r#for::*, r#match::*, r#while::*, statement::*,
 };
 
 use tree_sitter::Node;

src/abstract_tree/statement.rs

@@ -2,8 +2,8 @@ use serde::{Deserialize, Serialize};
 use tree_sitter::Node;
 
 use crate::{
-    r#async::Async, r#while::While, AbstractTree, Assignment, Error, Expression, IfElse, Match,
-    Result, Value, VariableMap,
+    AbstractTree, Assignment, Async, Error, Expression, For, IfElse, Match, Result, Value,
+    VariableMap, While,
 };
 
 /// Abstract representation of a statement.
@@ -17,7 +17,8 @@ pub enum Statement {
     IfElse(Box<IfElse>),
     Match(Match),
     While(Box<While>),
-    Run(Box<Async>),
+    Async(Box<Async>),
+    For(Box<For>),
 }
 
 impl AbstractTree for Statement {
@@ -42,7 +43,10 @@ impl AbstractTree for Statement {
             "while" => Ok(Statement::While(Box::new(While::from_syntax_node(
                 source, child,
             )?))),
-            "async" => Ok(Statement::Run(Box::new(Async::from_syntax_node(
+            "async" => Ok(Statement::Async(Box::new(Async::from_syntax_node(
+                source, child,
+            )?))),
+            "for" => Ok(Statement::For(Box::new(For::from_syntax_node(
                 source, child,
             )?))),
             _ => Err(Error::UnexpectedSyntaxNode {
@@ -61,7 +65,8 @@ impl AbstractTree for Statement {
             Statement::IfElse(if_else) => if_else.run(source, context),
             Statement::Match(r#match) => r#match.run(source, context),
             Statement::While(r#while) => r#while.run(source, context),
-            Statement::Run(run) => run.run(source, context),
+            Statement::Async(run) => run.run(source, context),
+            Statement::For(r#for) => r#for.run(source, context),
         }
     }
 }

tree-sitter-dust

@@ -1 +1 @@
-Subproject commit 9ec43a98418f395a668c59a79b0832e563d9f0e4
+Subproject commit 9fb89fcd8b29386735de0bad42232ef3d72e7e91