Implement container-level case_insensitive from issue #1

enumscribe_derive/src/enums.rs

@@ -3,11 +3,11 @@ use std::collections::HashSet;
 use proc_macro2::{Ident, Span};
 use quote::{quote, ToTokens};
 use syn::spanned::Spanned;
-use syn::{DataEnum, Fields};
+use syn::{DataEnum, Fields, Attribute};
 
 use crate::attribute::{Dict, Value};
 use crate::error::{MacroError, MacroResult};
-use crate::TokenStream2;
+use crate::{TokenStream2, CASE_SENSITIVE};
 use crate::{CASE_INSENSITIVE, CRATE_ATTR, IGNORE, NAME, OTHER};
 
 #[derive(Clone)]
@@ -94,13 +94,27 @@ impl VariantConstructor {
     }
 }
 
-pub(crate) fn parse_enum(data: &DataEnum) -> MacroResult<Enum> {
+pub(crate) fn parse_enum<'a>(data: &'a DataEnum, attrs: &'a [Attribute]) -> MacroResult<Enum<'a>> {
     let mut variants = Vec::with_capacity(data.variants.len());
     let mut taken_names = HashSet::new();
     let mut taken_insensitive_names = HashSet::new();
     let mut taken_sensitive_names = HashSet::new();
     let mut other_variant = false;
 
+    let global_case_insensitive = {
+        let mut dict = Dict::from_attrs(CRATE_ATTR, attrs)?;
+
+        let (global_case_insensitive, _) = dict.remove_typed_or_default(
+            CASE_INSENSITIVE,
+            (false, data.enum_token.span()),
+            Value::value_bool,
+        )?;
+
+        dict.assert_empty()?;
+
+        global_case_insensitive
+    };
+
     for variant in data.variants.iter() {
         let variant_span = variant.span();
 
@@ -108,17 +122,50 @@ pub(crate) fn parse_enum(data: &DataEnum) -> MacroResult<Enum> {
         let mut dict = Dict::from_attrs(CRATE_ATTR, &variant.attrs)?;
 
         // Convert the values in the Dict to the appropriate types
-        let name_opt = dict.remove_typed(NAME, Value::value_string)?;
-        let (other, other_span) =
-            dict.remove_typed_or_default(OTHER, (false, variant_span), Value::value_bool)?;
-        let (ignore, _) =
-            dict.remove_typed_or_default(IGNORE, (false, variant_span), Value::value_bool)?;
+        let name_opt = dict.remove_typed(
+            NAME,
+            Value::value_string
+        )?;
+        
+        let (other, other_span) = dict.remove_typed_or_default(
+            OTHER,
+            (false, variant_span),
+            Value::value_bool
+        )?;
+        
+        let (ignore, _) = dict.remove_typed_or_default(
+            IGNORE,
+            (false, variant_span),
+            Value::value_bool
+        )?;
+        
         let (case_insensitive, _) = dict.remove_typed_or_default(
             CASE_INSENSITIVE,
             (false, variant_span),
             Value::value_bool,
         )?;
 
+        let (case_sensitive, case_sensitive_span) = dict.remove_typed_or_default(
+            CASE_SENSITIVE,
+            (false, variant_span),
+            Value::value_bool
+        )?;
+
+        let case_insensitive = match (case_insensitive, case_sensitive) {
+            (false, false) => global_case_insensitive,
+            (false, true) => false,
+            (true, false) => true,
+            (true, true) => {
+                return Err(MacroError::new(
+                    format!(
+                        "variant {} cannot be both case_insensitive and case_sensitive",
+                        variant.ident,
+                    ),
+                    case_sensitive_span,
+                ))
+            }
+        };
+
         // Return an error if there are any unrecognised keys in the Dict
         dict.assert_empty()?;
 
@@ -247,4 +294,4 @@ pub(crate) fn parse_enum(data: &DataEnum) -> MacroResult<Enum> {
     }
 
     Ok(Enum { variants })
-}
+}

enumscribe_derive/src/lib.rs

@@ -10,7 +10,7 @@ use proc_macro::TokenStream;
 
 use proc_macro2::Ident;
 use quote::quote;
-use syn::{Data, DataEnum, DeriveInput};
+use syn::{Data, DataEnum, DeriveInput, Attribute};
 
 use error::{MacroError, MacroResult};
 
@@ -26,6 +26,7 @@ const NAME: &'static str = "str";
 const OTHER: &'static str = "other";
 const IGNORE: &'static str = "ignore";
 const CASE_INSENSITIVE: &'static str = "case_insensitive";
+const CASE_SENSITIVE: &'static str = "case_sensitive";
 
 type TokenStream2 = proc_macro2::TokenStream;
 
@@ -53,8 +54,8 @@ where
 {
     let input: DeriveInput = syn::parse(input).expect("failed to parse input");
 
-    let enum_data = proc_try!(get_enum_data(&input));
-    let parsed_enum = proc_try!(enums::parse_enum(enum_data));
+    let (enum_data, enum_attrs) = proc_try!(get_enum_data(&input));
+    let parsed_enum = proc_try!(enums::parse_enum(enum_data, enum_attrs));
 
     let enum_ident = &input.ident;
 
@@ -95,8 +96,8 @@ where
 {
     let input: DeriveInput = syn::parse(input).expect("failed to parse input");
 
-    let enum_data = proc_try!(get_enum_data(&input));
-    let parsed_enum = proc_try!(enums::parse_enum(enum_data));
+    let (enum_data, enum_attrs) = proc_try!(get_enum_data(&input));
+    let parsed_enum = proc_try!(enums::parse_enum(enum_data, enum_attrs));
 
     let enum_ident = &input.ident;
 
@@ -147,8 +148,8 @@ where
 {
     let input: DeriveInput = syn::parse(input).expect("failed to parse input");
 
-    let enum_data = proc_try!(get_enum_data(&input));
-    let parsed_enum = proc_try!(enums::parse_enum(enum_data));
+    let (enum_data, enum_attrs) = proc_try!(get_enum_data(&input));
+    let parsed_enum = proc_try!(enums::parse_enum(enum_data, enum_attrs));
 
     let enum_ident = &input.ident;
 
@@ -645,8 +646,8 @@ pub fn derive_try_unscribe(input: TokenStream) -> TokenStream {
 pub fn derive_enum_serialize(input: TokenStream) -> TokenStream {
     let input: DeriveInput = syn::parse(input).expect("failed to parse input");
 
-    let enum_data = proc_try!(get_enum_data(&input));
-    let parsed_enum = proc_try!(enums::parse_enum(enum_data));
+    let (enum_data, enum_attrs) = proc_try!(get_enum_data(&input));
+    let parsed_enum = proc_try!(enums::parse_enum(enum_data, enum_attrs));
 
     let enum_ident = &input.ident;
     let serializer_ident = quote! { __enumscribe_serializer };
@@ -737,8 +738,8 @@ pub fn derive_enum_serialize(input: TokenStream) -> TokenStream {
 pub fn derive_enum_deserialize(input: TokenStream) -> TokenStream {
     let input: DeriveInput = syn::parse(input).expect("failed to parse input");
 
-    let enum_data = proc_try!(get_enum_data(&input));
-    let parsed_enum = proc_try!(enums::parse_enum(enum_data));
+    let (enum_data, enum_attrs) = proc_try!(get_enum_data(&input));
+    let parsed_enum = proc_try!(enums::parse_enum(enum_data, enum_attrs));
 
     let enum_ident = &input.ident;
 
@@ -792,7 +793,7 @@ pub fn derive_enum_deserialize(input: TokenStream) -> TokenStream {
     .into()
 }
 
-fn get_enum_data(input: &DeriveInput) -> MacroResult<&DataEnum> {
+fn get_enum_data(input: &DeriveInput) -> MacroResult<(&DataEnum, &[Attribute])> {
     let enum_data = match &input.data {
         Data::Enum(enum_data) => enum_data,
         Data::Struct(_) => {
@@ -816,5 +817,5 @@ fn get_enum_data(input: &DeriveInput) -> MacroResult<&DataEnum> {
         ));
     }
 
-    Ok(enum_data)
+    Ok((enum_data, &input.attrs))
 }