Fix Build Issues

src/common.rs

@@ -52,6 +52,7 @@ impl<'a> Text<'a> for std::borrow::Cow<'a, str> {
 }
 
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct Directive<'a, T: Text<'a>> {
     pub position: Pos,
     pub name: T::Value,
@@ -65,11 +66,13 @@ pub struct Directive<'a, T: Text<'a>> {
 /// in `serde_json`: encapsulate value in new-type, allowing type
 /// to be extended later.
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 // we use i64 as a reference implementation: graphql-js thinks even 32bit
 // integers is enough. We might consider lift this limit later though
 pub struct Number(pub(crate) i64);
 
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub enum Value<'a, T: Text<'a>> {
     Variable(T::Value),
     Int(Number),
@@ -103,6 +106,7 @@ impl<'a, T: Text<'a>> Value<'a, T> {
 }
 
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub enum Type<'a, T: Text<'a>> {
     NamedType(T::Value),
     ListType(Box<Type<'a, T>>),

src/position.rs

@@ -1,8 +1,10 @@
+#[cfg(feature = "serde")]
 use serde::Serialize;
 use std::fmt;
 
 /// Original position of element in source code
-#[derive(PartialOrd, Ord, PartialEq, Eq, Clone, Copy, Default, Hash, Serialize)]
+#[derive(PartialOrd, Ord, PartialEq, Eq, Clone, Copy, Default, Hash)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct Pos {
     /// One-based line number
     pub line: usize,

src/query/ast.rs

@@ -5,13 +5,15 @@
 //!
 //! [graphql grammar]: http://facebook.github.io/graphql/October2016/#sec-Appendix-Grammar-Summary
 //!
+#[cfg(feature = "serde")]
 use serde::Serialize;
 
 pub use crate::common::{Directive, Number, Text, Type, Value};
 use crate::position::Pos;
 
 /// Root of query data
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct Document<'a, T: Text<'a>> {
     pub definitions: Vec<Definition<'a, T>>,
 }
@@ -35,13 +37,15 @@ impl<'a> Document<'a, String> {
     }
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub enum Definition<'a, T: Text<'a>> {
     Operation(OperationDefinition<'a, T>),
     Fragment(FragmentDefinition<'a, T>),
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct FragmentDefinition<'a, T: Text<'a>> {
     pub position: Pos,
     pub name: T::Value,
@@ -50,15 +54,17 @@ pub struct FragmentDefinition<'a, T: Text<'a>> {
     pub selection_set: SelectionSet<'a, T>,
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub enum OperationDefinition<'a, T: Text<'a>> {
     SelectionSet(SelectionSet<'a, T>),
     Query(Query<'a, T>),
     Mutation(Mutation<'a, T>),
     Subscription(Subscription<'a, T>),
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct Query<'a, T: Text<'a>> {
     pub position: Pos,
     pub name: Option<T::Value>,
@@ -67,7 +73,8 @@ pub struct Query<'a, T: Text<'a>> {
     pub selection_set: SelectionSet<'a, T>,
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct Mutation<'a, T: Text<'a>> {
     pub position: Pos,
     pub name: Option<T::Value>,
@@ -76,7 +83,8 @@ pub struct Mutation<'a, T: Text<'a>> {
     pub selection_set: SelectionSet<'a, T>,
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct Subscription<'a, T: Text<'a>> {
     pub position: Pos,
     pub name: Option<T::Value>,
@@ -85,28 +93,32 @@ pub struct Subscription<'a, T: Text<'a>> {
     pub selection_set: SelectionSet<'a, T>,
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct SelectionSet<'a, T: Text<'a>> {
     pub span: (Pos, Pos),
     pub items: Vec<Selection<'a, T>>,
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct VariableDefinition<'a, T: Text<'a>> {
     pub position: Pos,
     pub name: T::Value,
     pub var_type: Type<'a, T>,
     pub default_value: Option<Value<'a, T>>,
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub enum Selection<'a, T: Text<'a>> {
     Field(Field<'a, T>),
     FragmentSpread(FragmentSpread<'a, T>),
     InlineFragment(InlineFragment<'a, T>),
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct Field<'a, T: Text<'a>> {
     pub position: Pos,
     pub alias: Option<T::Value>,
@@ -116,19 +128,22 @@ pub struct Field<'a, T: Text<'a>> {
     pub selection_set: SelectionSet<'a, T>,
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct FragmentSpread<'a, T: Text<'a>> {
     pub position: Pos,
     pub fragment_name: T::Value,
     pub directives: Vec<Directive<'a, T>>,
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub enum TypeCondition<'a, T: Text<'a>> {
     On(T::Value),
 }
 
-#[derive(Debug, Clone, PartialEq, Serialize)]
+#[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Serialize))]
 pub struct InlineFragment<'a, T: Text<'a>> {
     pub position: Pos,
     pub type_condition: Option<TypeCondition<'a, T>>,