In progress...

1 files changed, 45 insertions, 1 deletions

diff --git a/src/context.rs b/src/context.rs
index d322411..2f12ea9 100644
--- a/src/context.rs
+++ b/src/context.rs
@@ -6,7 +6,10 @@ pub type Context = HashMap<String,Value>;
 
 pub trait MappedStructure {
     fn get_value(&self, id: &[IdentifierValue]) -> Option<Value>;
-
+    fn get_iterable<T>(&self, id: &[IdentifierValue]) -> Option<T>
+    where
+        T: IntoIterator,
+        T::Item: MappedStructure;
 }
 
 impl MappedStructure for Context {
@@ -36,6 +39,40 @@ impl MappedStructure for Context {
 
         return cur_val.cloned();
     }
+    
+    fn get_iter<T>(&self, id: &[IdentifierValue]) -> Option<T>
+    where
+        T: IntoIterator,
+        T::Item: MappedStructure, {
+        if id.len() == 0 {
+            return None;
+        }
+        let mut cur_val : Option<&Value> = if let IdentifierValue::Name(s) = &id[0] {
+            self.get(s)
+        } else {
+            return None;
+        };
+        if cur_val.is_none() {
+            return None;
+        }
+
+        for idx in 1..id.len() {
+            if let IdentifierValue::Name(s) = &id[idx] &&
+                let Some(Value::Dictionary(d)) = &cur_val {
+                cur_val.replace( if let Some(v) = d.get(s) {
+                    v
+                } else {
+                    return None;
+                });
+            }
+        }
+
+        if let Some(Value::List(l)) = cur_val {
+            return l.into
+        }
+
+        return cur_val.cloned();
+    }
 }
 
 pub struct StatefulContext<'a, T: MappedStructure> {
@@ -75,6 +112,13 @@ impl<'a, T: MappedStructure> MappedStructure for StatefulContext<'a,T> {
             self.local.get_value( id )
         }
     }
+
+    fn get_iter<U>(&self, id: &[IdentifierValue]) -> Option<U>
+    where
+        U: IntoIterator,
+        U::Item: MappedStructure, {
+        None
+    }
 }
 
 #[derive(Debug,Clone)]