Small improvement to how context! works

minijinja/src/context.rs

@@ -1,6 +1,28 @@
 #[cfg(test)]
 use similar_asserts::assert_eq;
 
+/// Hidden utility module for the [`context!`] macro.
+#[doc(hidden)]
+pub mod __context {
+    use crate::key::Key;
+    use crate::value::{RcType, Value, ValueMap, ValueRepr};
+
+    #[inline(always)]
+    pub fn make() -> ValueMap {
+        ValueMap::default()
+    }
+
+    #[inline(always)]
+    pub fn add(ctx: &mut ValueMap, key: &'static str, value: Value) {
+        ctx.insert(Key::Str(key), value);
+    }
+
+    #[inline(always)]
+    pub fn build(ctx: ValueMap) -> Value {
+        ValueRepr::Map(RcType::new(ctx)).into()
+    }
+}
+
 /// Creates a template context with keys and values.
 ///
 /// ```rust
@@ -37,25 +59,29 @@ use similar_asserts::assert_eq;
 /// ```
 #[macro_export]
 macro_rules! context {
+    () => {
+        $crate::__context::build($crate::__context::make())
+    };
     (
         $($key:ident $(=> $value:expr)?),* $(,)?
     ) => {{
-        let mut ctx = std::collections::BTreeMap::default();
+        let mut ctx = $crate::__context::make();
         $(
-            $crate::__pair!(ctx, $key $(, $value)?);
+            $crate::__context_pair!(ctx, $key $(, $value)?);
         )*
-        $crate::value::Value::from(ctx)
+        $crate::__context::build(ctx)
     }}
 }
 
 #[macro_export]
 #[doc(hidden)]
-macro_rules! __pair {
+macro_rules! __context_pair {
     ($ctx:ident, $key:ident) => {{
-        $crate::__pair!($ctx, $key, $key);
+        $crate::__context_pair!($ctx, $key, $key);
     }};
     ($ctx:ident, $key:ident, $value:expr) => {
-        $ctx.insert(
+        $crate::__context::add(
+            &mut $ctx,
             stringify!($key),
             $crate::value::Value::from_serializable(&$value),
         );

minijinja/src/functions.rs

@@ -174,8 +174,8 @@ mod builtins {
         step: Option<u32>,
     ) -> Result<Vec<u32>, Error> {
         let rng = match upper {
-            Some(upper) => (lower..upper),
-            None => (0..lower),
+            Some(upper) => lower..upper,
+            None => 0..lower,
         };
         Ok(if let Some(step) = step {
             rng.step_by(step as usize).collect()

minijinja/src/value.rs

@@ -95,10 +95,10 @@ pub(crate) type RcType<T> = std::rc::Rc<T>;
 const VALUE_HANDLE_MARKER: &str = "\x01__minijinja_ValueHandle";
 
 #[cfg(feature = "preserve_order")]
-pub(crate) type ValueMap<K, V> = indexmap::IndexMap<K, V>;
+pub(crate) type ValueMap = indexmap::IndexMap<Key<'static>, Value>;
 
 #[cfg(not(feature = "preserve_order"))]
-pub(crate) type ValueMap<K, V> = std::collections::BTreeMap<K, V>;
+pub(crate) type ValueMap = std::collections::BTreeMap<Key<'static>, Value>;
 
 thread_local! {
     static INTERNAL_SERIALIZATION: AtomicBool = AtomicBool::new(false);
@@ -261,7 +261,7 @@ pub(crate) enum ValueRepr {
     SafeString(RcType<String>),
     Bytes(RcType<Vec<u8>>),
     Seq(RcType<Vec<Value>>),
-    Map(RcType<ValueMap<Key<'static>, Value>>),
+    Map(RcType<ValueMap>),
     Dynamic(RcType<dyn Object>),
 }
 
@@ -1470,7 +1470,7 @@ impl ser::SerializeTupleVariant for SerializeTupleVariant {
 }
 
 struct SerializeMap {
-    entries: ValueMap<Key<'static>, Value>,
+    entries: ValueMap,
     key: Option<Key<'static>>,
 }
 
@@ -1518,7 +1518,7 @@ impl ser::SerializeMap for SerializeMap {
 
 struct SerializeStruct {
     name: &'static str,
-    fields: ValueMap<Key<'static>, Value>,
+    fields: ValueMap,
 }
 
 impl ser::SerializeStruct for SerializeStruct {
@@ -1555,7 +1555,7 @@ impl ser::SerializeStruct for SerializeStruct {
 
 struct SerializeStructVariant {
     variant: &'static str,
-    map: ValueMap<Key<'static>, Value>,
+    map: ValueMap,
 }
 
 impl ser::SerializeStructVariant for SerializeStructVariant {
@@ -1613,9 +1613,9 @@ enum ValueIteratorState {
     Empty,
     Seq(usize, RcType<Vec<Value>>),
     #[cfg(not(feature = "preserve_order"))]
-    Map(Option<Key<'static>>, RcType<ValueMap<Key<'static>, Value>>),
+    Map(Option<Key<'static>>, RcType<ValueMap>),
     #[cfg(feature = "preserve_order")]
-    Map(usize, RcType<ValueMap<Key<'static>, Value>>),
+    Map(usize, RcType<ValueMap>),
 }
 
 impl ValueIteratorState {