Revert Fix uppercase lowercase isses (#354, #429)

README.md

@@ -23,10 +23,8 @@
 [RON]: https://github.com/ron-rs/ron
 [JSON5]: https://github.com/callum-oakley/json5-rs
 
-Please note this library
-
- - can not be used to write changed configuration values back to the configuration file(s)!
- - Is case insensitive and all the keys are converted to lowercase internally
+Please note that this library can not be used to write changed configuration
+values back to the configuration file(s)!
 
 ## Usage
 

src/config.rs

@@ -110,8 +110,7 @@ impl Config {
     where
         T: Into<Value>,
     {
-        self.defaults
-            .insert(key.to_lowercase().as_str().parse()?, value.into());
+        self.defaults.insert(key.parse()?, value.into());
 
         #[allow(deprecated)]
         self.refresh()
@@ -130,16 +129,15 @@ impl Config {
     where
         T: Into<Value>,
     {
-        self.overrides
-            .insert(key.to_lowercase().as_str().parse()?, value.into());
+        self.overrides.insert(key.parse()?, value.into());
 
         #[allow(deprecated)]
         self.refresh()
     }
 
     #[deprecated(since = "0.12.0", note = "please use 'ConfigBuilder' instead")]
     pub fn set_once(&mut self, key: &str, value: Value) -> Result<()> {
-        let expr: path::Expression = key.to_lowercase().as_str().parse()?;
+        let expr: path::Expression = key.parse()?;
 
         // Traverse the cache using the path to (possibly) retrieve a value
         if let Some(ref mut val) = expr.get_mut(&mut self.cache) {
@@ -151,8 +149,6 @@ impl Config {
     }
 
     fn get_value(&self, key: &str) -> Result<Value> {
-        let k = key.to_lowercase();
-        let key = k.as_str();
         // Parse the key into a path expression
         let expr: path::Expression = key.parse()?;
 

src/de.rs

@@ -272,7 +272,7 @@ impl EnumAccess {
     fn variant_deserializer(&self, name: &str) -> Result<StrDeserializer<'_>> {
         self.variants
             .iter()
-            .find(|&&s| s.to_lowercase() == name.to_lowercase()) // changing to lowercase will enable deserialization of lowercase values to enums
+            .find(|&&s| s == name)
             .map(|&s| StrDeserializer(s))
             .ok_or_else(|| self.no_constructor_error(name))
     }

src/env.rs

@@ -155,10 +155,10 @@ impl Environment {
     /// To switch the default type back to type Strings you need to provide the keys which should be [`Vec<String>`] using this function.
     pub fn with_list_parse_key(mut self, key: &str) -> Self {
         if self.list_parse_keys.is_none() {
-            self.list_parse_keys = Some(vec![key.to_lowercase()]);
+            self.list_parse_keys = Some(vec![key.into()]);
         } else {
             self.list_parse_keys = self.list_parse_keys.map(|mut keys| {
-                keys.push(key.to_lowercase());
+                keys.push(key.into());
                 keys
             });
         }
@@ -289,9 +289,6 @@ impl Source for Environment {
                     ValueKind::Float(parsed)
                 } else if let Some(separator) = &self.list_separator {
                     if let Some(keys) = &self.list_parse_keys {
-                        #[cfg(feature = "convert-case")]
-                        let key = key.to_lowercase();
-
                         if keys.contains(&key) {
                             let v: Vec<Value> = value
                                 .split(separator)

src/path/mod.rs

@@ -120,7 +120,7 @@ impl Expression {
         match *self {
             Self::Identifier(ref id) => match root.kind {
                 ValueKind::Table(ref mut map) => Some(
-                    map.entry(id.to_lowercase())
+                    map.entry(id.clone())
                         .or_insert_with(|| Value::new(None, ValueKind::Nil)),
                 ),
 
@@ -131,15 +131,15 @@ impl Expression {
                 Some(value) => {
                     if let ValueKind::Table(ref mut map) = value.kind {
                         Some(
-                            map.entry(key.to_lowercase())
+                            map.entry(key.clone())
                                 .or_insert_with(|| Value::new(None, ValueKind::Nil)),
                         )
                     } else {
                         *value = Map::<String, Value>::new().into();
 
                         if let ValueKind::Table(ref mut map) = value.kind {
                             Some(
-                                map.entry(key.to_lowercase())
+                                map.entry(key.clone())
                                     .or_insert_with(|| Value::new(None, ValueKind::Nil)),
                             )
                         } else {
@@ -193,25 +193,25 @@ impl Expression {
                     ValueKind::Table(ref incoming_map) => {
                         // Pull out another table
                         let target = if let ValueKind::Table(ref mut map) = root.kind {
-                            map.entry(id.to_lowercase())
+                            map.entry(id.clone())
                                 .or_insert_with(|| Map::<String, Value>::new().into())
                         } else {
                             unreachable!();
                         };
 
                         // Continue the deep merge
                         for (key, val) in incoming_map {
-                            Self::Identifier(key.to_lowercase()).set(target, val.clone());
+                            Self::Identifier(key.clone()).set(target, val.clone());
                         }
                     }
 
                     _ => {
                         if let ValueKind::Table(ref mut map) = root.kind {
                             // Just do a simple set
-                            if let Some(existing) = map.get_mut(&id.to_lowercase()) {
+                            if let Some(existing) = map.get_mut(id) {
                                 *existing = value;
                             } else {
-                                map.insert(id.to_lowercase(), value);
+                                map.insert(id.clone(), value);
                             }
                         }
                     }
@@ -224,7 +224,7 @@ impl Expression {
                         // Didn't find a table. Oh well. Make a table and do this anyway
                         *parent = Map::<String, Value>::new().into();
                     }
-                    Self::Identifier(key.to_lowercase()).set(parent, value);
+                    Self::Identifier(key.clone()).set(parent, value);
                 }
             }
 

tests/testsuite/case.rs

@@ -0,0 +1,78 @@
+use serde_derive::Deserialize;
+
+use config::{Config, File, FileFormat};
+
+#[test]
+#[cfg(feature = "json")]
+fn respect_field_case() {
+    #[derive(Deserialize, Debug)]
+    #[allow(non_snake_case)]
+    #[allow(dead_code)]
+    struct Kafka {
+        broker: String,
+        topic: String,
+        pollSleep: u64, //<---
+    }
+
+    let c = Config::builder()
+        .add_source(File::from_str(
+            r#"
+{
+  "broker": "localhost:29092",
+  "topic": "rust",
+  "pollSleep": 1000
+}
+"#,
+            FileFormat::Json,
+        ))
+        .build()
+        .unwrap();
+
+    c.try_deserialize::<Kafka>().unwrap();
+}
+
+#[test]
+#[cfg(feature = "json")]
+fn respect_renamed_field() {
+    #[derive(Deserialize, Debug)]
+    #[allow(dead_code)]
+    struct MyConfig {
+        #[serde(rename = "FooBar")]
+        foo_bar: String,
+    }
+
+    let c = Config::builder()
+        .add_source(File::from_str(
+            r#"
+{
+  "FooBar": "Hello, world!"
+}
+"#,
+            FileFormat::Json,
+        ))
+        .build()
+        .unwrap();
+
+    c.try_deserialize::<MyConfig>().unwrap();
+}
+
+#[test]
+#[cfg(feature = "json")]
+fn respect_path_case() {
+    let c = Config::builder()
+        .add_source(File::from_str(
+            r#"
+{
+  "Student": [
+    { "Name": "1" },
+    { "Name": "2" }
+  ]
+}
+"#,
+            FileFormat::Json,
+        ))
+        .build()
+        .unwrap();
+
+    c.get_string("Student[0].Name").unwrap();
+}

tests/testsuite/env.rs

@@ -1,5 +1,7 @@
-use config::{Config, Environment, Source};
 use serde_derive::Deserialize;
+use snapbox::{assert_data_eq, str};
+
+use config::{Config, Environment, Source};
 
 /// Reminder that tests using env variables need to use different env variable names, since
 /// tests can be run in parallel
@@ -474,11 +476,13 @@ fn test_parse_string_and_list_ignore_list_parse_key_case() {
     // using a struct in an enum here to make serde use `deserialize_any`
     #[derive(Deserialize, Debug)]
     #[serde(tag = "tag")]
+    #[allow(dead_code)]
     enum TestStringEnum {
         String(TestString),
     }
 
     #[derive(Deserialize, Debug)]
+    #[allow(dead_code)]
     struct TestString {
         string_val: String,
         string_list: Vec<String>,
@@ -503,20 +507,13 @@ fn test_parse_string_and_list_ignore_list_parse_key_case() {
                 .build()
                 .unwrap();
 
-            let config: TestStringEnum = config.try_deserialize().unwrap();
+            let res = config.try_deserialize::<TestStringEnum>();
 
-            match config {
-                TestStringEnum::String(TestString {
-                    string_val,
-                    string_list,
-                }) => {
-                    assert_eq!(String::from("test,string"), string_val);
-                    assert_eq!(
-                        vec![String::from("test"), String::from("string")],
-                        string_list
-                    );
-                }
-            }
+            assert!(res.is_err());
+            assert_data_eq!(
+                res.unwrap_err().to_string(),
+                str![[r#"invalid type: string "test,string", expected a sequence"#]]
+            );
         },
     );
 }

tests/testsuite/file_ini.rs

@@ -121,7 +121,7 @@ rating = 4.5
     match cap_settings {
         Ok(v) => {
             // this assertion will ensure that the map has only lowercase keys
-            assert_ne!(v.FOO, "FOO should be overridden");
+            assert_eq!(v.FOO, "FOO should be overridden");
             assert_eq!(
                 lower_settings.foo,
                 "I HAVE BEEN OVERRIDDEN_WITH_UPPER_CASE".to_owned()
@@ -198,11 +198,12 @@ bar = "bar is a lowercase param"
         .add_source(config::Environment::with_prefix("APPS").separator("_"))
         .build()
         .unwrap();
-    let val: EnumSettings = cfg.try_deserialize().unwrap();
 
-    assert_eq!(
-        val,
-        EnumSettings::Bar("I HAVE BEEN OVERRIDDEN_WITH_UPPER_CASE".to_owned())
+    let param = cfg.try_deserialize::<EnumSettings>();
+    assert!(param.is_err());
+    assert_data_eq!(
+        param.unwrap_err().to_string(),
+        str!["enum EnumSettings does not have variant constructor bar"]
     );
 }
 
@@ -226,11 +227,11 @@ bar = "bar is a lowercase param"
         .build()
         .unwrap();
 
-    let param: EnumSettings = cfg.try_deserialize().unwrap();
-
-    assert_eq!(
-        param,
-        EnumSettings::Bar("I have been overridden_with_lower_case".to_owned())
+    let param = cfg.try_deserialize::<EnumSettings>();
+    assert!(param.is_err());
+    assert_data_eq!(
+        param.unwrap_err().to_string(),
+        str!["enum EnumSettings does not have variant constructor bar"]
     );
 }
 

tests/testsuite/file_json.rs

@@ -115,27 +115,6 @@ fn test_error_parse() {
     );
 }
 
-#[test]
-fn test_json_vec() {
-    let c = Config::builder()
-        .add_source(File::from_str(
-            r#"
-            {
-              "WASTE": ["example_dir1", "example_dir2"]
-            }
-"#,
-            FileFormat::Json,
-        ))
-        .build()
-        .unwrap();
-
-    let v = c.get_array("WASTE").unwrap();
-    let mut vi = v.into_iter();
-    assert_eq!(vi.next().unwrap().into_string().unwrap(), "example_dir1");
-    assert_eq!(vi.next().unwrap().into_string().unwrap(), "example_dir2");
-    assert!(vi.next().is_none());
-}
-
 #[test]
 fn test_override_uppercase_value_for_struct() {
     #[derive(Debug, Deserialize, PartialEq)]
@@ -189,7 +168,7 @@ fn test_override_uppercase_value_for_struct() {
     match cap_settings {
         Ok(v) => {
             // this assertion will ensure that the map has only lowercase keys
-            assert_ne!(v.FOO, "FOO should be overridden");
+            assert_eq!(v.FOO, "FOO should be overridden");
             assert_eq!(
                 lower_settings.foo,
                 "I HAVE BEEN OVERRIDDEN_WITH_UPPER_CASE".to_owned()
@@ -279,11 +258,12 @@ fn test_override_uppercase_value_for_enums() {
         .add_source(config::Environment::with_prefix("APPS").separator("_"))
         .build()
         .unwrap();
-    let val: EnumSettings = cfg.try_deserialize().unwrap();
 
-    assert_eq!(
-        val,
-        EnumSettings::Bar("I HAVE BEEN OVERRIDDEN_WITH_UPPER_CASE".to_owned())
+    let param = cfg.try_deserialize::<EnumSettings>();
+    assert!(param.is_err());
+    assert_data_eq!(
+        param.unwrap_err().to_string(),
+        str!["enum EnumSettings does not have variant constructor bar"]
     );
 }
 
@@ -309,11 +289,11 @@ fn test_override_lowercase_value_for_enums() {
         .build()
         .unwrap();
 
-    let param: EnumSettings = cfg.try_deserialize().unwrap();
-
-    assert_eq!(
-        param,
-        EnumSettings::Bar("I have been overridden_with_lower_case".to_owned())
+    let param = cfg.try_deserialize::<EnumSettings>();
+    assert!(param.is_err());
+    assert_data_eq!(
+        param.unwrap_err().to_string(),
+        str!["enum EnumSettings does not have variant constructor bar"]
     );
 }