Add From instances for Value (#1091)

* Add Into instances for Value

* Update conversions.rs

* rustfmt

prost-types/src/conversions.rs

@@ -0,0 +1,62 @@
+use crate::protobuf::Value;
+use crate::value;
+use crate::String;
+use crate::Vec;
+use ::prost::alloc::collections::BTreeMap;
+
+impl From<value::Kind> for Value {
+    fn from(value: value::Kind) -> Self {
+        Value { kind: Some(value) }
+    }
+}
+
+macro_rules! impl_number_value {
+    ($t: ty) => {
+        impl From<$t> for Value {
+            fn from(value: $t) -> Self {
+                value::Kind::NumberValue(value.into()).into()
+            }
+        }
+    };
+}
+
+impl_number_value!(u8);
+impl_number_value!(u16);
+impl_number_value!(u32);
+
+impl_number_value!(i8);
+impl_number_value!(i16);
+impl_number_value!(i32);
+
+impl_number_value!(f32);
+impl_number_value!(f64);
+
+impl From<bool> for Value {
+    fn from(value: bool) -> Self {
+        value::Kind::BoolValue(value).into()
+    }
+}
+
+impl From<String> for Value {
+    fn from(value: String) -> Self {
+        value::Kind::StringValue(value).into()
+    }
+}
+
+impl<'a> From<&'a str> for Value {
+    fn from(value: &str) -> Self {
+        value::Kind::StringValue(value.into()).into()
+    }
+}
+
+impl From<Vec<Value>> for Value {
+    fn from(value: Vec<Value>) -> Self {
+        value::Kind::ListValue(crate::protobuf::ListValue { values: value }).into()
+    }
+}
+
+impl From<BTreeMap<String, Value>> for Value {
+    fn from(value: BTreeMap<String, Value>) -> Self {
+        value::Kind::StructValue(crate::protobuf::Struct { fields: value }).into()
+    }
+}

prost-types/src/lib.rs

@@ -51,3 +51,5 @@ pub use timestamp::TimestampError;
 
 mod type_url;
 pub(crate) use type_url::{type_url_for, TypeUrl};
+
+mod conversions;