Add function calling

Signed-off-by: Marcel Müller <neikos@neikos.email>

src/value.rs

@@ -310,6 +310,18 @@ impl From<&'static str> for NomoValue {
     }
 }
 
+impl From<u64> for NomoValue {
+    fn from(val: u64) -> Self {
+        NomoValue::Integer { value: val }
+    }
+}
+
+impl From<i64> for NomoValue {
+    fn from(val: i64) -> Self {
+        NomoValue::SignedInteger { value: val }
+    }
+}
+
 impl<V> From<Vec<V>> for NomoValue
 where
     V: Into<NomoValue>,
@@ -355,11 +367,43 @@ where
     }
 }
 
-#[cfg(feature = "serde_json")]
 #[derive(Debug, Error, Display)]
-/// Could not transform value to [`NomoValue`]
+/// Could not transform value to/from [`NomoValue`]
 pub struct NomoValueError;
 
+impl TryFrom<NomoValue> for String {
+    type Error = NomoValueError;
+
+    fn try_from(value: NomoValue) -> Result<Self, Self::Error> {
+        match value {
+            NomoValue::String { value } => Ok(value.to_string()),
+            _ => Err(NomoValueError),
+        }
+    }
+}
+
+impl TryFrom<NomoValue> for i64 {
+    type Error = NomoValueError;
+
+    fn try_from(value: NomoValue) -> Result<Self, Self::Error> {
+        match value {
+            NomoValue::SignedInteger { value } => Ok(value),
+            _ => Err(NomoValueError),
+        }
+    }
+}
+
+impl TryFrom<NomoValue> for u64 {
+    type Error = NomoValueError;
+
+    fn try_from(value: NomoValue) -> Result<Self, Self::Error> {
+        match value {
+            NomoValue::Integer { value } => Ok(value),
+            _ => Err(NomoValueError),
+        }
+    }
+}
+
 #[cfg(feature = "serde_json")]
 impl TryFrom<serde_json::Value> for NomoValue {
     type Error = NomoValueError;