(feat) initial commit of json module

Author: sunng87

Cargo.toml

@@ -3,6 +3,7 @@ resolver = "2"
 members = [
     "valuable",
     "valuable-derive",
+    "valuable-json",
     "valuable-serde",
     "tests",
 ]

valuable-json/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "valuable-json"
+version = "0.1.0"
+authors = ["Ning Sun <[email protected]>"]
+edition = "2018"
+license = "MIT"
+description = "Valuable instrument for `serde_json::Value`"
+
+[dependencies]
+valuable = { version = "0.1", path = "../valuable", default-features = false }
+serde_json = "1"

valuable-json/src/lib.rs

@@ -0,0 +1,36 @@
+use serde_json::{Value as JsonValue};
+use valuable::{Valuable, Value, Visit};
+
+struct Json<'a>(&'a JsonValue);
+
+impl<'a> Valuable for Json<'a> {
+    fn as_value(&self) -> Value<'a> {
+        match self.0 {
+            // TODO: fixme
+            JsonValue::Array(ref array) => Value::Listable(array),
+            JsonValue::Bool(ref value) => Value::Bool(*value),
+            JsonValue::Number(ref num) => {
+                // TODO: check correctness for this
+                if num.is_f64() {
+                    Value::F64(num.as_f64().unwrap())
+                } else if num.is_i64() {
+                    Value::I64(num.as_i64().unwrap())
+                } else if num.is_u64() {
+                    Value::U64(num.as_u64().unwrap())
+                } else {
+                    unreachable!()
+                }
+            }
+            JsonValue::Null => Value::Unit,
+            JsonValue::String(ref s) => Value::String(s),
+            JsonValue::Object(ref object) => {
+                // TODO: make map valuable
+                Value::Mappable(object),
+            }
+        }
+    }
+
+    fn visit(&self, visit: &mut dyn Visit) {
+        //TODO:
+    }
+}