diff --git a/src/bin.rs b/src/bin.rs
index 0f279c7..c70a52c 100644
--- a/src/bin.rs
+++ b/src/bin.rs
@@ -316,7 +316,24 @@ impl Loopable for serde_json::Value {
 
 impl Sizable for serde_json::Value {
     fn get_size<'a>(&'a self) -> Option<IceResult<'a>> {
-        todo!()
+        match self {
+            serde_json::Value::Null => {
+                Some(IceResult::from_owned(OwnedLiteral::LPositiveInteger(0)))
+            }
+            serde_json::Value::Bool(_boolean) => {
+                Some(IceResult::from_owned(OwnedLiteral::LPositiveInteger(0)))
+            }
+            serde_json::Value::Number(_num) => Some(IceResult::from_borrowed(self)),
+            serde_json::Value::String(text) => Some(IceResult::from_owned(
+                OwnedLiteral::LPositiveInteger(text.len().try_into().unwrap()),
+            )),
+            serde_json::Value::Array(arr) => Some(IceResult::from_owned(
+                OwnedLiteral::LPositiveInteger(arr.len().try_into().unwrap()),
+            )),
+            serde_json::Value::Object(obj) => Some(IceResult::from_owned(
+                OwnedLiteral::LPositiveInteger(obj.len().try_into().unwrap()),
+            )),
+        }
     }
 }
 
diff --git a/src/renderer/parameters_context.rs b/src/renderer/parameters_context.rs
index 0d45fbc..ad2585c 100644
--- a/src/renderer/parameters_context.rs
+++ b/src/renderer/parameters_context.rs
@@ -21,6 +21,7 @@ use crate::renderer::Walkable;
 use std::borrow::Borrow;
 use std::cmp::Ordering;
 use std::collections::HashMap;
+use std::convert::TryInto;
 
 #[derive(Debug)]
 pub struct ParametersContext<'a> {
@@ -192,7 +193,14 @@ impl Walkable for OwnedLiteral {
 
 impl Sizable for OwnedLiteral {
     fn get_size<'a>(&'a self) -> Option<IceResult<'a>> {
-        todo!()
+        match self {
+            OwnedLiteral::LFloat(_) => Some(IceResult::from_borrowed(self)),
+            OwnedLiteral::LPositiveInteger(_) => Some(IceResult::from_borrowed(self)),
+            OwnedLiteral::LNegativeInteger(_) => Some(IceResult::from_borrowed(self)),
+            OwnedLiteral::LString(text) => Some(IceResult::from_owned(
+                OwnedLiteral::LPositiveInteger(text.len().try_into().unwrap()),
+            )),
+        }
     }
 }