Implement async statment

examples/async.ds

@@ -0,0 +1,19 @@
+(output "This will print first.")
+
+create_random_numbers = |count| => {
+	numbers = [];
+
+	while (length numbers) < count {
+		numbers += (random_integer)
+	}
+
+	(output "Made " + count + " numbers.")
+}
+
+async {
+	(create_random_numbers 1000)
+ 	(create_random_numbers 100)
+	(create_random_numbers 10)
+}
+
+(output "This will print last.")

src/abstract_tree/async.rs

@@ -2,43 +2,25 @@ use rayon::prelude::*;
 use serde::{Deserialize, Serialize};
 use tree_sitter::Node;
 
-use crate::{AbstractTree, Block, Error, Map, Result, Value};
+use crate::{AbstractTree, Block, Map, Result, Value};
 
 #[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
 pub struct Async {
-    statements: Vec<Block>,
+    block: Block,
 }
 
 impl AbstractTree for Async {
     fn from_syntax_node(source: &str, node: Node) -> Result<Self> {
         debug_assert_eq!("async", node.kind());
 
-        let child_count = node.child_count();
-        let mut statements = Vec::with_capacity(child_count);
+        let block_node = node.child(1).unwrap();
+        let block = Block::from_syntax_node(source, block_node)?;
 
-        for index in 2..child_count - 1 {
-            let child = node.child(index).unwrap();
-
-            let statement = match child.kind() {
-                "statement" => Block::from_syntax_node(source, child)?,
-                _ => {
-                    return Err(Error::UnexpectedSyntaxNode {
-                        expected: "comment or statement",
-                        actual: child.kind(),
-                        location: child.start_position(),
-                        relevant_source: source[child.byte_range()].to_string(),
-                    })
-                }
-            };
-
-            statements.push(statement);
-        }
-
-        Ok(Async { statements })
+        Ok(Async { block })
     }
 
     fn run(&self, source: &str, context: &mut Map) -> Result<Value> {
-        let statements = &self.statements;
+        let statements = self.block.statements();
 
         statements
             .into_par_iter()
@@ -47,6 +29,7 @@ impl AbstractTree for Async {
                 let mut context = context.clone();
                 let result = statement.run(source, &mut context);
 
+                result.clone().unwrap();
                 if result.is_err() {
                     Some(result)
                 } else if index == statements.len() - 1 {
@@ -55,6 +38,6 @@ impl AbstractTree for Async {
                     None
                 }
             })
-            .unwrap()
+            .unwrap_or(Ok(Value::Empty))
     }
 }

src/abstract_tree/block.rs

@@ -8,6 +8,12 @@ pub struct Block {
     statements: Vec<Statement>,
 }
 
+impl Block {
+    pub fn statements(&self) -> &Vec<Statement> {
+        &self.statements
+    }
+}
+
 impl AbstractTree for Block {
     fn from_syntax_node(source: &str, node: Node) -> Result<Self> {
         debug_assert_eq!("block", node.kind());

src/value/mod.rs

@@ -219,19 +219,20 @@ impl Add for Value {
     type Output = Result<Value>;
 
     fn add(self, other: Self) -> Self::Output {
-        match (self.as_integer(), other.as_integer()) {
-            (Ok(left), Ok(right)) => return Ok(Value::Integer(left + right)),
-            _ => {}
+        if let (Ok(left), Ok(right)) = (self.as_integer(), other.as_integer()) {
+            return Ok(Value::Integer(left + right));
         }
 
-        match (self.as_number(), other.as_number()) {
-            (Ok(left), Ok(right)) => return Ok(Value::Float(left + right)),
-            _ => {}
+        if let (Ok(left), Ok(right)) = (self.as_number(), other.as_number()) {
+            return Ok(Value::Float(left + right));
         }
 
-        match (self.as_string(), other.as_string()) {
-            (Ok(left), Ok(right)) => return Ok(Value::String(left.to_string() + right)),
-            _ => {}
+        if let (Ok(left), Ok(right)) = (self.as_string(), other.as_string()) {
+            return Ok(Value::String(left.to_string() + right));
+        }
+
+        if self.is_string() || other.is_string() {
+            return Ok(Value::String(self.to_string() + &other.to_string()));
         }
 
         let non_number_or_string = if !self.is_number() == !self.is_string() {