Make maps multi-threaded again

src/abstract_tree/for.rs

@@ -102,10 +102,9 @@ impl AbstractTree for For {
             return Ok(Value::none());
         }
 
-        let values = expression_run.as_list()?.items();
+        if let Value::List(list) = expression_run {
-
             if self.is_async {
-            values.par_iter().try_for_each(|value| {
+                list.items().par_iter().try_for_each(|value| {
                     let iter_context = Context::with_variables_from(context)?;
 
                     iter_context.set_value(key.clone(), value.clone())?;
@@ -115,12 +114,13 @@ impl AbstractTree for For {
             } else {
                 let loop_context = Context::with_variables_from(context)?;
 
-            for value in values.iter() {
+                for value in list.items().iter() {
                     loop_context.set_value(key.clone(), value.clone())?;
 
                     self.block.run(source, &loop_context)?;
                 }
             }
+        }
 
         Ok(Value::none())
     }

src/abstract_tree/index.rs

@@ -84,6 +84,8 @@ impl AbstractTree for Index {
                 Ok(item)
             }
             Value::Map(map) => {
+                let map = map.inner()?;
+
                 let (key, value) = if let IndexExpression::Identifier(identifier) = &self.index {
                     let key = identifier.inner();
                     let value = map.get(key).unwrap_or_default();

src/abstract_tree/value_node.rs

@@ -294,17 +294,17 @@ impl AbstractTree for ValueNode {
                 Value::Option(option_value)
             }
             ValueNode::Map(key_statement_pairs, _) => {
-                let mut map = Map::new();
+                let mut map = BTreeMap::new();
 
                 {
                     for (key, (statement, _)) in key_statement_pairs {
                         let value = statement.run(source, context)?;
 
-                        map.set(key.clone(), value);
+                        map.insert(key.clone(), value);
                     }
                 }
 
-                Value::Map(map)
+                Value::Map(Map::with_values(map))
             }
             ValueNode::BuiltInValue(built_in_value) => built_in_value.run(source, context)?,
             ValueNode::Structure(node_map) => {

src/built_in_functions/mod.rs

@@ -111,7 +111,7 @@ impl Callable for BuiltInFunction {
                 let length = if let Ok(list) = value.as_list() {
                     list.items().len()
                 } else if let Ok(map) = value.as_map() {
-                    map.len()
+                    map.inner()?.len()
                 } else if let Ok(str) = value.as_string() {
                     str.chars().count()
                 } else {

src/main.rs

@@ -293,7 +293,7 @@ impl Completer for DustCompleter {
             }
 
             if let Value::Map(map) = built_in_value.get() {
-                for (key, value) in map.iter() {
+                for (key, value) in map.inner().unwrap().iter() {
                     if key.contains(last_word) {
                         suggestions.push(Suggestion {
                             value: format!("{name}:{key}"),

src/value/map.rs

@@ -1,4 +1,3 @@
-use serde::{Deserialize, Serialize};
 use stanza::{
     renderer::{console::Console, Renderer},
     style::{HAlign, Styles},
@@ -7,51 +6,52 @@ use stanza::{
 use std::{
     collections::BTreeMap,
     fmt::{self, Display, Formatter},
+    sync::{Arc, RwLock, RwLockReadGuard},
 };
 
-use crate::value::Value;
+use crate::{error::rw_lock_error::RwLockError, value::Value};
 
 /// A collection dust variables comprised of key-value pairs.
 ///
 /// The inner value is a BTreeMap in order to allow VariableMap instances to be sorted and compared
 /// to one another.
-#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord, Serialize, Deserialize)]
+#[derive(Clone, Debug)]
 pub struct Map {
-    inner: BTreeMap<String, Value>,
+    inner: Arc<RwLock<BTreeMap<String, Value>>>,
 }
 
 impl Map {
     /// Creates a new instace.
     pub fn new() -> Self {
         Map {
-            inner: BTreeMap::new(),
+            inner: Arc::new(RwLock::new(BTreeMap::new())),
         }
     }
 
     pub fn with_values(variables: BTreeMap<String, Value>) -> Self {
-        Map { inner: variables }
+        Map {
+            inner: Arc::new(RwLock::new(variables)),
+        }
     }
 
-    pub fn len(&self) -> usize {
+    pub fn inner(&self) -> Result<RwLockReadGuard<BTreeMap<String, Value>>, RwLockError> {
-        self.inner.len()
+        Ok(self.inner.read()?)
     }
 
-    pub fn iter(&self) -> impl Iterator<Item = (&String, &Value)> {
+    pub fn get(&self, key: &str) -> Result<Option<Value>, RwLockError> {
-        self.inner.iter()
+        Ok(self.inner()?.get(key).cloned())
     }
 
-    pub fn get(&self, key: &str) -> Option<&Value> {
+    pub fn set(&self, key: String, value: Value) -> Result<(), RwLockError> {
-        self.inner.get(key)
+        self.inner.write()?.insert(key, value);
-    }
 
-    pub fn set(&mut self, key: String, value: Value) {
+        Ok(())
-        self.inner.insert(key, value);
     }
 
     pub fn as_text_table(&self) -> Table {
         let mut table = Table::with_styles(Styles::default().with(HAlign::Centred));
 
-        for (key, value) in &self.inner {
+        for (key, value) in self.inner().unwrap().iter() {
             if let Value::Map(map) = value {
                 table.push_row(Row::new(
                     Styles::default(),
@@ -92,3 +92,34 @@ impl Display for Map {
         f.write_str(&renderer.render(&self.as_text_table()))
     }
 }
+
+impl Eq for Map {}
+
+impl PartialEq for Map {
+    fn eq(&self, other: &Self) -> bool {
+        let left = self.inner().unwrap();
+        let right = other.inner().unwrap();
+
+        if left.len() != right.len() {
+            return false;
+        }
+
+        left.iter()
+            .zip(right.iter())
+            .all(|((left_key, left_value), (right_key, right_value))| {
+                left_key == right_key && left_value == right_value
+            })
+    }
+}
+
+impl PartialOrd for Map {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for Map {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.inner().unwrap().cmp(&other.inner().unwrap())
+    }
+}

src/value/mod.rs

@@ -3,12 +3,13 @@ use crate::{error::RuntimeError, Identifier, Type, TypeSpecification};
 
 use serde::{
     de::{MapAccess, SeqAccess, Visitor},
-    ser::SerializeTuple,
+    ser::{SerializeMap, SerializeTuple},
     Deserialize, Serialize, Serializer,
 };
 
 use std::{
     cmp::Ordering,
+    collections::BTreeMap,
     convert::TryFrom,
     fmt::{self, Display, Formatter},
     marker::PhantomData,
@@ -82,7 +83,7 @@ impl Value {
             Value::Map(map) => {
                 let mut identifier_types = Vec::new();
 
-                for (key, value) in map.iter() {
+                for (key, value) in map.inner().unwrap().iter() {
                     identifier_types.push((
                         Identifier::new(key.clone()),
                         TypeSpecification::new(value.r#type()),
@@ -513,7 +514,16 @@ impl Serialize for Value {
                 list.end()
             }
             Value::Option(inner) => inner.serialize(serializer),
-            Value::Map(inner) => inner.serialize(serializer),
+            Value::Map(map) => {
+                let entries = map.inner().unwrap();
+                let mut map = serializer.serialize_map(Some(entries.len()))?;
+
+                for (key, value) in entries.iter() {
+                    map.serialize_entry(key, value)?;
+                }
+
+                map.end()
+            }
             Value::Function(inner) => inner.serialize(serializer),
             Value::Structure(inner) => inner.serialize(serializer),
             Value::Range(range) => range.serialize(serializer),
@@ -858,13 +868,13 @@ impl<'de> Visitor<'de> for ValueVisitor {
     where
         M: MapAccess<'de>,
     {
-        let mut map = Map::new();
+        let mut map = BTreeMap::new();
 
         while let Some((key, value)) = access.next_entry::<String, Value>()? {
-            map.set(key, value);
+            map.insert(key, value);
         }
 
-        Ok(Value::Map(map))
+        Ok(Value::Map(Map::with_values(map)))
     }
 
     fn visit_enum<A>(self, data: A) -> std::result::Result<Self::Value, A::Error>

tests/for_loop.rs

@@ -92,10 +92,10 @@ fn modify_map() {
         ",
     );
 
-    let mut map = Map::new();
+    let map = Map::new();
 
-    map.set("x".to_string(), Value::Integer(1));
+    map.set("x".to_string(), Value::Integer(1)).unwrap();
-    map.set("y".to_string(), Value::Integer(2));
+    map.set("y".to_string(), Value::Integer(2)).unwrap();
 
     assert_eq!(Ok(Value::Map(map)), result);
 }
@@ -137,10 +137,10 @@ fn modify_map_values() {
         ",
     );
 
-    let mut map = Map::new();
+    let map = Map::new();
 
-    map.set("x".to_string(), Value::Integer(1));
+    map.set("x".to_string(), Value::Integer(1)).unwrap();
-    map.set("y".to_string(), Value::Integer(2));
+    map.set("y".to_string(), Value::Integer(2)).unwrap();
 
     assert_eq!(Ok(Value::Map(map)), result);
 }

tests/functions.rs

@@ -89,9 +89,9 @@ fn function_context_captures_functions() {
 
 #[test]
 fn function_context_captures_structure_definitions() {
-    let mut map = Map::new();
+    let map = Map::new();
 
-    map.set("name".to_string(), Value::string("bob"));
+    map.set("name".to_string(), Value::string("bob")).unwrap();
 
     assert_eq!(
         interpret(

tests/value.rs

@@ -69,10 +69,11 @@ fn empty_list() {
 
 #[test]
 fn map() {
-    let mut map = Map::new();
+    let map = Map::new();
 
-    map.set("x".to_string(), Value::Integer(1));
+    map.set("x".to_string(), Value::Integer(1)).unwrap();
-    map.set("foo".to_string(), Value::string("bar".to_string()));
+    map.set("foo".to_string(), Value::string("bar".to_string()))
+        .unwrap();
 
     assert_eq!(interpret("{ x = 1, foo = 'bar' }"), Ok(Value::Map(map)));
 }
@@ -84,10 +85,11 @@ fn empty_map() {
 
 #[test]
 fn map_types() {
-    let mut map = Map::new();
+    let map = Map::new();
 
-    map.set("x".to_string(), Value::Integer(1));
+    map.set("x".to_string(), Value::Integer(1)).unwrap();
-    map.set("foo".to_string(), Value::string("bar".to_string()));
+    map.set("foo".to_string(), Value::string("bar".to_string()))
+        .unwrap();
 
     assert_eq!(
         interpret("{ x <int> = 1, foo <str> = 'bar' }"),