Implement find loop logic

examples/find_loop.ds

@@ -0,0 +1,7 @@
+list = [1 2 1 3]
+
+found = find i in list {
+	i == 3
+}
+
+(assert_equal 3 found)

src/abstract_tree/find.rs

@@ -0,0 +1,48 @@
+use serde::{Deserialize, Serialize};
+
+use crate::{AbstractTree, Expression, Identifier, Item, Value};
+
+#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
+pub struct Find {
+    identifier: Identifier,
+    expression: Expression,
+    item: Item,
+}
+
+impl AbstractTree for Find {
+    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(Find {
+            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();
+        let mut context = context.clone();
+
+        for value in list {
+            context.set_value(key.clone(), value.clone())?;
+
+            let should_return = self.item.run(source, &mut context)?.as_boolean()?;
+
+            if should_return {
+                return Ok(value.clone());
+            }
+        }
+
+        Ok(Value::Empty)
+    }
+}

src/abstract_tree/mod.rs

@@ -10,6 +10,7 @@ pub mod assignment;
 pub mod r#async;
 pub mod expression;
 pub mod filter;
+pub mod find;
 pub mod r#for;
 pub mod function_call;
 pub mod identifier;
@@ -25,8 +26,9 @@ pub mod value_node;
 pub mod r#while;
 
 pub use {
-    assignment::*, expression::*, filter::*, function_call::*, identifier::*, if_else::*, item::*,
-    logic::*, math::*, r#async::*, r#for::*, r#match::*, r#while::*, statement::*, transform::*,
+    assignment::*, expression::*, filter::*, find::*, function_call::*, identifier::*, if_else::*,
+    item::*, logic::*, math::*, r#async::*, r#for::*, r#match::*, r#while::*, statement::*,
+    transform::*,
 };
 
 use tree_sitter::Node;

src/abstract_tree/statement.rs

@@ -2,7 +2,7 @@ use serde::{Deserialize, Serialize};
 use tree_sitter::Node;
 
 use crate::{
-    AbstractTree, Assignment, Async, Error, Expression, Filter, For, IfElse, Match, Result,
+    AbstractTree, Assignment, Async, Error, Expression, Filter, Find, For, IfElse, Match, Result,
     Transform, Value, VariableMap, While,
 };
 
@@ -21,6 +21,7 @@ pub enum Statement {
     For(Box<For>),
     Transform(Box<Transform>),
     Filter(Box<Filter>),
+    Find(Box<Find>),
 }
 
 impl AbstractTree for Statement {
@@ -57,6 +58,9 @@ impl AbstractTree for Statement {
             "filter" => Ok(Statement::Filter(Box::new(Filter::from_syntax_node(
                 source, child,
             )?))),
+            "find" => Ok(Statement::Find(Box::new(Find::from_syntax_node(
+                source, child,
+            )?))),
             _ => Err(Error::UnexpectedSyntaxNode {
                 expected: "assignment, expression, if...else, while, for, transform, filter, tool or async",
                 actual: child.kind(),
@@ -77,6 +81,7 @@ impl AbstractTree for Statement {
             Statement::For(r#for) => r#for.run(source, context),
             Statement::Transform(transform) => transform.run(source, context),
             Statement::Filter(filter) => filter.run(source, context),
+            Statement::Find(find) => find.run(source, context),
         }
     }
 }

src/lib.rs

@@ -34,7 +34,7 @@ pub fn language() -> Language {
 /// The content of the [`node-types.json`][] file for this grammar.
 ///
 /// [`node-types.json`]: https://tree-sitter.github.io/tree-sitter/using-parsers#static-node-types
-pub const NODE_TYPES: &'static str = include_str!("../../tree-sitter-dust/src/node-types.json");
+pub const NODE_TYPES: &'static str = include_str!("../tree-sitter-dust/src/node-types.json");
 
 // Uncomment these to include any queries that this grammar contains