Implement await statements

examples/async.ds

@@ -2,44 +2,32 @@
 (output "This will print second.")
 
 create_random_numbers = |count| => {
-	numbers = []
+	numbers = [];
 
 	while (length numbers) < count {
 		numbers += (random_integer)
 	}
 }
 
-do_second = async {
+do_a_lot = async {
-	{	
 	(create_random_numbers 1000)
 	(output "Made 1000 numbers")
 }
-	{	
+
+do_some = async {
 	(create_random_numbers 100)
 	(output "Made 100 numbers")
 }
-	{	
+
+do_a_little = async {
 	(create_random_numbers 10)
 	(output "Made 10 numbers")
 }
-}
 
-do_first = async {
+await {
-	{	
+	do_a_lot
-		(create_random_numbers 400)
+	do_some
-		(output "Made 400 numbers")
+	do_a_little
 }
-	{	
-		(create_random_numbers 40)
-		(output "Made 40 numbers")
-	}
-	{	
-		(create_random_numbers 4)
-		(output "Made 4 numbers")
-	}
-}
-
-do_first.await
-do_second.await
 
 (output "This will print last.")

src/abstract_tree/async.rs

@@ -1,60 +0,0 @@
-use rayon::prelude::*;
-use serde::{Deserialize, Serialize};
-use tree_sitter::Node;
-
-use crate::{AbstractTree, Block, Error, Map, Result, Value};
-
-#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
-pub struct Async {
-    statements: Vec<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);
-
-        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 })
-    }
-
-    fn run(&self, source: &str, context: &mut Map) -> Result<Value> {
-        let statements = &self.statements;
-
-        statements
-            .into_par_iter()
-            .enumerate()
-            .find_map_first(|(index, statement)| {
-                let mut context = context.clone();
-                let result = statement.run(source, &mut context);
-
-                if result.is_err() {
-                    Some(result)
-                } else if index == statements.len() - 1 {
-                    Some(result)
-                } else {
-                    None
-                }
-            })
-            .unwrap()
-    }
-}

src/abstract_tree/await.rs

@@ -0,0 +1,53 @@
+use rayon::prelude::*;
+use serde::{Deserialize, Serialize};
+use tree_sitter::Node;
+
+use crate::{AbstractTree, Expression, Map, Result, Value};
+
+#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
+pub struct Await {
+    expressions: Vec<Expression>,
+}
+
+impl AbstractTree for Await {
+    fn from_syntax_node(source: &str, node: Node) -> Result<Self> {
+        debug_assert_eq!("await", node.kind());
+
+        let mut expressions = Vec::new();
+
+        for index in 2..node.child_count() - 1 {
+            let child = node.child(index).unwrap();
+
+            if child.is_named() {
+                let expression = Expression::from_syntax_node(source, child)?;
+
+                expressions.push(expression);
+            }
+        }
+
+        Ok(Await { expressions })
+    }
+
+    fn run(&self, source: &str, context: &mut Map) -> Result<Value> {
+        let expressions = &self.expressions;
+
+        expressions
+            .into_par_iter()
+            .find_map_first(|expression| {
+                let mut context = context.clone();
+                let value = if let Ok(value) = expression.run(source, &mut context) {
+                    value
+                } else {
+                    return None;
+                };
+
+                let run_result = match value {
+                    Value::Future(block) => block.run(source, &mut context),
+                    _ => return None,
+                };
+
+                Some(run_result)
+            })
+            .unwrap_or(Ok(Value::Empty))
+    }
+}

src/abstract_tree/built_in_function.rs

@@ -320,11 +320,11 @@ impl AbstractTree for BuiltInFunction {
                     Value::Map(map) => map.len(),
                     Value::Table(table) => table.len(),
                     Value::String(string) => string.chars().count(),
-                    Value::Function(_) => todo!(),
+                    _ => {
-                    Value::Float(_) => todo!(),
+                        return Err(Error::ExpectedCollection {
-                    Value::Integer(_) => todo!(),
+                            actual: value.clone(),
-                    Value::Boolean(_) => todo!(),
+                        });
-                    Value::Empty => todo!(),
+                    }
                 };
 
                 Ok(Value::Integer(length as i64))

src/abstract_tree/mod.rs

@@ -7,7 +7,7 @@
 //! examples.
 
 pub mod assignment;
-pub mod r#async;
+pub mod r#await;
 pub mod block;
 pub mod built_in_function;
 pub mod expression;
@@ -33,8 +33,8 @@ pub mod r#while;
 pub use {
     assignment::*, block::*, built_in_function::*, expression::*, filter::*, find::*,
     function_call::*, identifier::*, if_else::*, index::*, insert::*, logic::*, math::*,
-    r#async::*, r#for::*, r#match::*, r#while::*, remove::*, select::*, statement::*, sublist::*,
+    r#await::*, r#await::*, r#for::*, r#match::*, r#while::*, remove::*, select::*, statement::*,
-    transform::*, value_node::*,
+    sublist::*, transform::*, value_node::*,
 };
 
 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, Find, For, IfElse, Insert, Map,
+    AbstractTree, Assignment, Await, Error, Expression, Filter, Find, For, IfElse, Insert, Map,
     Match, Remove, Result, Select, Transform, Value, While,
 };
 
@@ -13,11 +13,12 @@ use crate::{
 #[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
 pub enum Statement {
     Assignment(Box<Assignment>),
+    Await(Await),
     Expression(Expression),
     IfElse(Box<IfElse>),
     Match(Match),
     While(Box<While>),
-    Async(Box<Async>),
+    Async(Box<Await>),
     For(Box<For>),
     Transform(Box<Transform>),
     Filter(Box<Filter>),
@@ -37,6 +38,7 @@ impl AbstractTree for Statement {
             "assignment" => Ok(Statement::Assignment(Box::new(
                 Assignment::from_syntax_node(source, child)?,
             ))),
+            "await" => Ok(Statement::Await(Await::from_syntax_node(source, child)?)),
             "expression" => Ok(Self::Expression(Expression::from_syntax_node(
                 source, child,
             )?)),
@@ -49,7 +51,7 @@ impl AbstractTree for Statement {
             "while" => Ok(Statement::While(Box::new(While::from_syntax_node(
                 source, child,
             )?))),
-            "async" => Ok(Statement::Async(Box::new(Async::from_syntax_node(
+            "async" => Ok(Statement::Async(Box::new(Await::from_syntax_node(
                 source, child,
             )?))),
             "for" => Ok(Statement::For(Box::new(For::from_syntax_node(
@@ -85,6 +87,7 @@ impl AbstractTree for Statement {
     fn run(&self, source: &str, context: &mut Map) -> Result<Value> {
         match self {
             Statement::Assignment(assignment) => assignment.run(source, context),
+            Statement::Await(r#await) => r#await.run(source, context),
             Statement::Expression(expression) => expression.run(source, context),
             Statement::IfElse(if_else) => if_else.run(source, context),
             Statement::Match(r#match) => r#match.run(source, context),

src/abstract_tree/value_node.rs

@@ -123,15 +123,19 @@ impl AbstractTree for ValueNode {
 
                 ValueType::Function(Function::new(parameters, body))
             }
-            _ => {
+            "future" => {
-                return Err(Error::UnexpectedSyntaxNode {
+                let block_node = child.child(1).unwrap();
+                let block = Block::from_syntax_node(source, block_node)?;
+
+                ValueType::Future(block)
+            }
+            _ => return Err(Error::UnexpectedSyntaxNode {
                 expected:
-                        "string, integer, float, boolean, list, table, map, function or empty",
+                    "string, integer, float, boolean, list, table, map, function, future or empty",
                 actual: child.kind(),
                 location: child.start_position(),
                 relevant_source: source[child.byte_range()].to_string(),
-                })
+            }),
-            }
         };
 
         Ok(ValueNode {
@@ -203,6 +207,7 @@ impl AbstractTree for ValueNode {
                 Value::Table(table)
             }
             ValueType::Function(function) => Value::Function(function.clone()),
+            ValueType::Future(block) => Value::Future(block.clone()),
         };
 
         Ok(value)

src/value/mod.rs

@@ -1,7 +1,7 @@
 //! Types that represent runtime values.
 use crate::{
     error::{Error, Result},
-    Function, List, Map, Table, ValueType,
+    Block, Function, List, Map, Table, ValueType,
 };
 
 use json::JsonValue;
@@ -32,14 +32,15 @@ pub mod value_type;
 /// value that can be treated as any other.
 #[derive(Debug, Clone, Default)]
 pub enum Value {
+    Boolean(bool),
+    Float(f64),
+    Function(Function),
+    Future(Block),
+    Integer(i64),
     List(List),
     Map(Map),
-    Table(Table),
-    Function(Function),
     String(String),
-    Float(f64),
+    Table(Table),
-    Integer(i64),
-    Boolean(bool),
     #[default]
     Empty,
 }
@@ -391,6 +392,8 @@ impl Ord for Value {
             (Value::Table(_), _) => Ordering::Greater,
             (Value::Function(left), Value::Function(right)) => left.cmp(right),
             (Value::Function(_), _) => Ordering::Greater,
+            (Value::Future(left), Value::Future(right)) => left.cmp(right),
+            (Value::Future(_), _) => Ordering::Greater,
             (Value::Empty, Value::Empty) => Ordering::Equal,
             (Value::Empty, _) => Ordering::Less,
         }
@@ -421,6 +424,7 @@ impl Serialize for Value {
             Value::Map(inner) => inner.serialize(serializer),
             Value::Table(inner) => inner.serialize(serializer),
             Value::Function(inner) => inner.serialize(serializer),
+            Value::Future(inner) => inner.serialize(serializer),
         }
     }
 }
@@ -443,6 +447,7 @@ impl Display for Value {
             Value::Map(map) => write!(f, "{map}"),
             Value::Table(table) => write!(f, "{table}"),
             Value::Function(function) => write!(f, "{function}"),
+            Value::Future(block) => write!(f, "{block:?}"),
         }
     }
 }

src/value/table.rs

@@ -242,6 +242,13 @@ impl From<&Value> for Table {
                     .insert(vec![Value::Function(function.clone())])
                     .unwrap();
 
+                table
+            }
+            Value::Future(block) => {
+                let mut table = Table::new(vec!["future".to_string()]);
+
+                table.insert(vec![Value::Future(block.clone())]).unwrap();
+
                 table
             }
         }

src/value/value_type.rs

@@ -5,7 +5,7 @@ use std::{
 
 use serde::{Deserialize, Serialize};
 
-use crate::{value_node::ValueNode, Expression, Function, Identifier, Statement, Value};
+use crate::{value_node::ValueNode, Block, Expression, Function, Identifier, Statement, Value};
 
 /// The type of a `Value`.
 #[derive(Clone, Serialize, Deserialize, PartialOrd, Ord)]
@@ -23,6 +23,7 @@ pub enum ValueType {
         rows: Box<Expression>,
     },
     Function(Function),
+    Future(Block),
 }
 
 impl Eq for ValueType {}
@@ -84,6 +85,7 @@ impl Display for ValueType {
                 write!(f, "table")
             }
             ValueType::Function(function) => write!(f, "{function}"),
+            ValueType::Future(_) => write!(f, "future"),
         }
     }
 }
@@ -137,6 +139,7 @@ impl From<&Value> for ValueType {
                 ))),
             },
             Value::Function(function) => ValueType::Function(function.clone()),
+            Value::Future(block) => ValueType::Future(block.clone()),
         }
     }
 }

tree-sitter-dust/corpus/functions.txt

@@ -101,7 +101,7 @@ Complex Function Call
 (foobar
     "hi"
     42
-    {
+    map {
       x = 1
       y = 2
     }
@@ -124,13 +124,20 @@ Complex Function Call
           (expression
             (value
               (map
+                (block
+                  (statement
+                    (assignment
                       (identifier)
+                      (assignment_operator)
                       (statement
                         (expression
                           (value
-                      (integer))))
+                            (integer))))))
+                  (statement
+                    (assignment
                       (identifier)
+                      (assignment_operator)
                       (statement
                         (expression
                           (value
-                      (integer))))))))))))
+                            (integer)))))))))))))))

tree-sitter-dust/corpus/futures.txt

@@ -1,5 +1,5 @@
 ================================================================================
-Simple Async Statements
+Simple Future
 ================================================================================
 
 async { (output 'Whaddup') }
@@ -22,9 +22,8 @@ async { (output 'Whaddup') }
                           (string))))))))))))))
 
 ================================================================================
-Complex Async Statements
+Complex Future
 ================================================================================
-
 async {
   if 1 % 2 == 0 {
     true
@@ -35,6 +34,10 @@ async {
   'foobar'
 }
 
+async { 123 }
+
+'foo'
+
 --------------------------------------------------------------------------------
 
 (root
@@ -76,4 +79,17 @@ async {
               (statement
                 (expression
                   (value
-                    (string)))))))))))
+                    (string)))))))))
+    (statement
+      (expression
+        (value
+          (future
+            (block
+              (statement
+                (expression
+                  (value
+                    (integer)))))))))
+    (statement
+      (expression
+        (value
+          (string))))))

tree-sitter-dust/corpus/maps.txt

@@ -1,10 +1,10 @@
-==================
+================================================================================
 Simple Map
-==================
+================================================================================
 
-{ answer = 42 }
+map { answer = 42 }
 
----
+--------------------------------------------------------------------------------
 
 (root
   (block
@@ -12,27 +12,31 @@ Simple Map
       (expression
         (value
           (map
+            (block
+              (statement
+                (assignment
                   (identifier)
+                  (assignment_operator)
                   (statement
                     (expression
                       (value
-                  (integer))))))))))
+                        (integer)))))))))))))
 
-==================
+================================================================================
 Nested Maps
-==================
+================================================================================
 
-x = {
+x = map {
-  y = {
+  y = map {
     foo = 'bar'
-    z = {
+    z = map {
       message = 'hiya'
     }
   }
   f = 12
 }
 
----
+--------------------------------------------------------------------------------
 
 (root
   (block
@@ -44,28 +48,46 @@ x = {
           (expression
             (value
               (map
+                (block
+                  (statement
+                    (assignment
                       (identifier)
+                      (assignment_operator)
                       (statement
                         (expression
                           (value
                             (map
+                              (block
+                                (statement
+                                  (assignment
                                     (identifier)
+                                    (assignment_operator)
                                     (statement
                                       (expression
                                         (value
-                              (string))))
+                                          (string))))))
+                                (statement
+                                  (assignment
                                     (identifier)
+                                    (assignment_operator)
                                     (statement
                                       (expression
                                         (value
                                           (map
+                                            (block
+                                              (statement
+                                                (assignment
                                                   (identifier)
+                                                  (assignment_operator)
                                                   (statement
                                                     (expression
                                                       (value
-                                      (string))))))))))))
+                                                        (string))))))))))))))))))))
+                  (statement
+                    (assignment
                       (identifier)
+                      (assignment_operator)
                       (statement
                         (expression
                           (value
-                      (integer))))))))))))
+                            (integer)))))))))))))))

tree-sitter-dust/grammar.js

@@ -7,7 +7,6 @@ module.exports = grammar({
 
   conflicts: $ => [
     [$.block],
-    [$.map, $.assignment_operator],
   ],
 
   rules: {
@@ -23,6 +22,7 @@ module.exports = grammar({
     statement: $ => prec.right(seq(
       choice(
         $.assignment,
+        $.await,
         $.expression,
         $.filter,
         $.find,
@@ -44,7 +44,7 @@ module.exports = grammar({
       seq('(', $._expression_kind, ')'),
     )),
 
-    _expression_kind: $ => prec.left(1, choice(
+    _expression_kind: $ => prec.right(1, choice(
       $.function_call,
       $.identifier,
       $.index,
@@ -92,19 +92,13 @@ module.exports = grammar({
 
     list: $ => seq(
       '[',
-      $._expression_list,
+      repeat(prec.right(seq($.expression, optional(',')))),
       ']',
     ),
 
     map: $ => seq(
-      '{',
+      'map',
-      repeat(seq(
+      $.block,
-        $.identifier,
-        "=",
-        $.statement,
-        optional(',')
-      )),
-      '}',
     ),
 
     future: $ => seq(
@@ -112,6 +106,13 @@ module.exports = grammar({
       $.block,
     ),
 
+    await: $ => seq(
+      'await',
+      '{',
+      $._expression_list,
+      '}',
+    ),
+ 
     index: $ => prec.left(seq(
       $.expression,
       ':',

tree-sitter-dust/src/grammar.json

@@ -59,6 +59,10 @@
                 "type": "SYMBOL",
                 "name": "assignment"
               },
+              {
+                "type": "SYMBOL",
+                "name": "await"
+              },
               {
                 "type": "SYMBOL",
                 "name": "expression"
@@ -155,7 +159,7 @@
       }
     },
     "_expression_kind": {
-      "type": "PREC_LEFT",
+      "type": "PREC_RIGHT",
       "value": 1,
       "content": {
         "type": "CHOICE",
@@ -480,39 +484,17 @@
           "type": "STRING",
           "value": "["
         },
-        {
-          "type": "SYMBOL",
-          "name": "_expression_list"
-        },
-        {
-          "type": "STRING",
-          "value": "]"
-        }
-      ]
-    },
-    "map": {
-      "type": "SEQ",
-      "members": [
-        {
-          "type": "STRING",
-          "value": "{"
-        },
         {
           "type": "REPEAT",
+          "content": {
+            "type": "PREC_RIGHT",
+            "value": 0,
             "content": {
               "type": "SEQ",
               "members": [
                 {
                   "type": "SYMBOL",
-                "name": "identifier"
+                  "name": "expression"
-              },
-              {
-                "type": "STRING",
-                "value": "="
-              },
-              {
-                "type": "SYMBOL",
-                "name": "statement"
                 },
                 {
                   "type": "CHOICE",
@@ -528,10 +510,24 @@
                 }
               ]
             }
+          }
         },
         {
           "type": "STRING",
-          "value": "}"
+          "value": "]"
+        }
+      ]
+    },
+    "map": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "map"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "block"
         }
       ]
     },
@@ -548,6 +544,27 @@
         }
       ]
     },
+    "await": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "await"
+        },
+        {
+          "type": "STRING",
+          "value": "{"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "_expression_list"
+        },
+        {
+          "type": "STRING",
+          "value": "}"
+        }
+      ]
+    },
     "index": {
       "type": "PREC_LEFT",
       "value": 0,
@@ -1411,10 +1428,6 @@
   "conflicts": [
     [
       "block"
-    ],
-    [
-      "map",
-      "assignment_operator"
     ]
   ],
   "precedences": [],

tree-sitter-dust/src/node-types.json

@@ -27,6 +27,21 @@
     "named": true,
     "fields": {}
   },
+  {
+    "type": "await",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "expression",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "block",
     "named": true,
@@ -384,7 +399,7 @@
     "fields": {},
     "children": {
       "multiple": true,
-      "required": true,
+      "required": false,
       "types": [
         {
           "type": "expression",
@@ -422,15 +437,11 @@
     "named": true,
     "fields": {},
     "children": {
-      "multiple": true,
+      "multiple": false,
-      "required": false,
+      "required": true,
       "types": [
         {
-          "type": "identifier",
+          "type": "block",
-          "named": true
-        },
-        {
-          "type": "statement",
           "named": true
         }
       ]
@@ -575,6 +586,10 @@
           "type": "assignment",
           "named": true
         },
+        {
+          "type": "await",
+          "named": true
+        },
         {
           "type": "expression",
           "named": true
@@ -846,6 +861,10 @@
     "type": "async",
     "named": false
   },
+  {
+    "type": "await",
+    "named": false
+  },
   {
     "type": "bash",
     "named": false
@@ -934,6 +953,10 @@
     "type": "length",
     "named": false
   },
+  {
+    "type": "map",
+    "named": false
+  },
   {
     "type": "match",
     "named": false