chore: remove I/O functions to account for YAML optionality

crates/oas3/CHANGELOG.md

@@ -2,6 +2,16 @@
 
 ## Unreleased
 
+- Add new crate feature `yaml-spec` (on-by-default).
+- Add top-level `from_json()` function.
+- Add top-level `from_yaml()` function, guarded by the `yaml-spec` crate feature.
+- The top-level `to_json()` function now returns `serde_json` errors directly.
+- The top-level `to_yaml()` function now returns `serde_yaml` errors directly.
+- The top-level `to_yaml()` function is now guarded by the `yaml-spec` crate feature.
+- Remove top-level `from_reader()` function.
+- Remove top-level `from_path()` function.
+- Remove top-level `Error` type.
+
 ## 0.14.0
 
 - Implement `Default` for `spec::{Components, Contact, Example, Flows}`.

crates/oas3/Cargo.toml

@@ -11,9 +11,8 @@ edition = { workspace = true }
 rust-version = { workspace = true }
 
 [features]
-default = ["validation", "yaml_spec"]
-validation = []
-yaml_spec = ["dep:serde_yaml"]
+default = []
+yaml-spec = ["dep:serde_yaml"]
 
 [dependencies]
 derive_more = { workspace = true, features = ["display", "error", "from"] }
@@ -33,9 +32,8 @@ indoc = { workspace = true }
 pretty_assertions = { workspace = true }
 
 [[example]]
-name = "printers"
-path = "examples/printer.rs"
-required-features = ["yaml_spec"]
+name = "printer"
+required-features = ["yaml-spec"]
 
 [lints]
 workspace = true

crates/oas3/README.md

@@ -24,7 +24,9 @@ specs in the older format.
 ## Example
 
 ```rust
-match oas3::from_path("path/to/openapi.yml") {
+let yaml = std::fs::read_to_string("path/to/openapi.yml").unwrap();
+
+match oas3::from_yaml(yaml) {
   Ok(spec) => println!("spec: {:?}", spec),
   Err(err) => println!("error: {}", err)
 }

crates/oas3/examples/printer.rs

@@ -1,12 +1,15 @@
 //! Demonstrates reading an OpenAPI spec file and printing back to stdout.
 
-use std::env;
+use std::{env, fs};
 
 fn main() -> eyre::Result<()> {
-    if let Some(path) = env::args().nth(1) {
-        let spec = oas3::from_path(path)?;
-        println!("{}", oas3::to_yaml(&spec).unwrap());
-    }
+    let Some(path) = env::args().nth(1) else {
+        return Ok(());
+    };
+
+    let yaml = fs::read_to_string(path)?;
+    let spec = oas3::from_yaml(yaml)?;
+    println!("{}", oas3::to_yaml(&spec).unwrap());
 
     Ok(())
 }

crates/oas3/src/lib.rs

@@ -6,7 +6,9 @@
 //! # Example
 //!
 //! ```no_run
-//! match oas3::from_path("path/to/openapi.yml") {
+//! let yaml = std::fs::read_to_string("path/to/openapi.yml").unwrap();
+//!
+//! match oas3::from_yaml(yaml) {
 //!   Ok(spec) => println!("spec: {:?}", spec),
 //!   Err(err) => println!("error: {}", err)
 //! }
@@ -17,12 +19,9 @@
 #![warn(missing_docs)]
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
-use std::{fs::File, io::Read, path::Path};
-
-mod error;
 pub mod spec;
 
-pub use self::{error::Error, spec::Spec};
+pub use self::spec::Spec;
 
 /// Version 3.1.0 of the OpenAPI specification.
 ///
@@ -32,63 +31,48 @@ pub use self::{error::Error, spec::Spec};
 pub type OpenApiV3Spec = spec::Spec;
 
 /// Try deserializing an OpenAPI spec (YAML or JSON) from a file, giving the path.
-///
-/// If the `yaml` feature flag is disabled only `JSON` specs are supported
-pub fn from_path<P>(path: P) -> Result<OpenApiV3Spec, Error>
-where
-    P: AsRef<Path>,
-{
-    from_reader(File::open(path)?)
+#[cfg(all(test, feature = "yaml-spec"))]
+pub(crate) fn from_path(
+    path: impl AsRef<std::path::Path>,
+) -> std::io::Result<Result<OpenApiV3Spec, serde_yaml::Error>> {
+    let file = std::fs::File::open(path.as_ref())?;
+    Ok(from_reader(file))
 }
 
 /// Try deserializing an OpenAPI spec (YAML or JSON) from a [`Read`] type.
-///
-/// If the `yaml` feature flag is disabled only `JSON` specs are supported
-pub fn from_reader<R>(read: R) -> Result<OpenApiV3Spec, Error>
-where
-    R: Read,
-{
-    #[cfg(feature = "yaml_spec")]
-    {
-        Ok(serde_yaml::from_reader::<R, OpenApiV3Spec>(read)?)
-    }
-    #[cfg(not(feature = "yaml_spec"))]
-    {
-        Ok(serde_json::from_reader::<R, OpenApiV3Spec>(read)?)
-    }
+#[cfg(all(test, feature = "yaml-spec"))]
+pub(crate) fn from_reader(read: impl std::io::Read) -> Result<OpenApiV3Spec, serde_yaml::Error> {
+    serde_yaml::from_reader::<_, OpenApiV3Spec>(read)
 }
 
-/// Try deserializing an OpenAPI spec (YAML or JSON) from string.
-///
-/// If the `yaml` feature flag is disabled only `JSON` specs are supported
-pub fn from_str(val: impl AsRef<str>) -> Result<OpenApiV3Spec, Error> {
-    #[cfg(feature = "yaml_spec")]
-    {
-        Ok(serde_yaml::from_str::<OpenApiV3Spec>(val.as_ref())?)
-    }
-    #[cfg(not(feature = "yaml_spec"))]
-    {
-        Ok(serde_json::from_str::<OpenApiV3Spec>(val.as_ref())?)
-    }
+/// Deserializes an OpenAPI spec (YAML-format) from a string.
+#[cfg(feature = "yaml-spec")]
+pub fn from_yaml(yaml: impl AsRef<str>) -> Result<OpenApiV3Spec, serde_yaml::Error> {
+    serde_yaml::from_str(yaml.as_ref())
+}
+
+/// Deserializes an OpenAPI spec (JSON-format) from a string.
+pub fn from_json(json: impl AsRef<str>) -> Result<OpenApiV3Spec, serde_json::Error> {
+    serde_json::from_str(json.as_ref())
 }
 
-/// Try serializing to a YAML string.
-#[cfg(feature = "yaml_spec")]
-pub fn to_yaml(spec: &OpenApiV3Spec) -> Result<String, Error> {
-    Ok(serde_yaml::to_string(spec)?)
+/// Serializes OpenAPI spec to a YAML string.
+#[cfg(feature = "yaml-spec")]
+pub fn to_yaml(spec: &OpenApiV3Spec) -> Result<String, serde_yaml::Error> {
+    serde_yaml::to_string(spec)
 }
 
-/// Try serializing to a JSON string.
-pub fn to_json(spec: &OpenApiV3Spec) -> Result<String, Error> {
-    Ok(serde_json::to_string_pretty(spec)?)
+/// Serializes OpenAPI spec to a JSON string.
+pub fn to_json(spec: &OpenApiV3Spec) -> Result<String, serde_json::Error> {
+    serde_json::to_string_pretty(spec)
 }
 
-#[cfg(all(test, feature = "yaml_spec"))]
+#[cfg(all(test, feature = "yaml-spec"))]
 mod tests {
     use std::{
         fs::{self, read_to_string, File},
         io::Write,
-        path,
+        path::{self, Path},
     };
 
     use pretty_assertions::assert_eq;
@@ -143,7 +127,7 @@ mod tests {
         //     File -> `Spec` -> `serde_json::Value` -> `String`
 
         // Parse the input file
-        let parsed_spec = from_path(input_file).unwrap();
+        let parsed_spec = from_path(input_file).unwrap().unwrap();
         // Convert to serde_json::Value
         let parsed_spec_json = serde_json::to_value(parsed_spec).unwrap();
         // Convert to a JSON string

crates/oas3/src/spec/discriminator.rs

@@ -24,7 +24,7 @@ pub struct Discriminator {
     pub mapping: Option<BTreeMap<String, String>>,
 }
 
-#[cfg(all(test, feature = "yaml_spec"))]
+#[cfg(all(test, feature = "yaml-spec"))]
 mod tests {
     use super::*;
 

crates/oas3/src/spec/media_type_examples.rs

@@ -81,9 +81,8 @@ impl MediaTypeExamples {
     }
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "yaml-spec"))]
 mod tests {
-    #[cfg(feature = "yaml_spec")]
     use serde_json::json;
 
     use super::*;
@@ -99,7 +98,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "yaml_spec")]
     fn deserialize() {
         assert_eq!(
             serde_yaml::from_str::<MediaTypeExamples>(indoc::indoc! {"
@@ -121,7 +119,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "yaml_spec")]
     fn serialize() {
         let mt_examples = MediaTypeExamples::default();
         assert_eq!(
@@ -143,7 +140,6 @@ mod tests {
     }
 
     #[test]
-    #[cfg(feature = "yaml_spec")]
     fn single_example() {
         let spec = serde_yaml::from_str::<Spec>(indoc::indoc! {"
 openapi: 3.1.0
@@ -171,7 +167,6 @@ paths: {}
     }
 
     #[test]
-    #[cfg(feature = "yaml_spec")]
     fn resolve_references() {
         let spec = serde_yaml::from_str::<Spec>(indoc::indoc! {"
 openapi: 3.1.0

crates/oas3/src/spec/mod.rs

@@ -227,46 +227,3 @@ impl Spec {
         self.servers.first()
     }
 }
-
-#[cfg(all(test, feature = "yaml_spec"))]
-mod tests {
-    use pretty_assertions::assert_eq;
-
-    use super::*;
-
-    #[test]
-    fn spec_extensions_deserialize() {
-        let spec = indoc::indoc! {"
-            openapi: '3.1.0'
-            info:
-              title: test
-              version: v1
-            components: {}
-            x-bar: true
-            qux: true
-        "};
-
-        let spec = serde_yaml::from_str::<Spec>(spec).unwrap();
-        assert!(spec.components.is_some());
-        assert!(!spec.extensions.contains_key("x-bar"));
-        assert!(!spec.extensions.contains_key("qux"));
-        assert_eq!(spec.extensions.get("bar").unwrap(), true);
-    }
-
-    #[test]
-    fn spec_extensions_serialize() {
-        let spec = indoc::indoc! {"
-            openapi: 3.1.0
-            info:
-              title: test
-              version: v1
-            components: {}
-            x-bar: true
-        "};
-
-        let parsed_spec = serde_yaml::from_str::<Spec>(spec).unwrap();
-        let round_trip_spec = serde_yaml::to_string(&parsed_spec).unwrap();
-
-        assert_eq!(spec, round_trip_spec);
-    }
-}

crates/oas3/src/spec/parameter.rs

@@ -223,7 +223,7 @@ impl FromRef for Parameter {
     }
 }
 
-#[cfg(all(test, feature = "yaml_spec"))]
+#[cfg(all(test, feature = "yaml-spec"))]
 mod tests {
     use indoc::indoc;
 

crates/oas3/src/spec/schema.rs

@@ -593,7 +593,7 @@ where
     T::deserialize(de).map(Some)
 }
 
-#[cfg(all(test, feature = "yaml_spec"))]
+#[cfg(all(test, feature = "yaml-spec"))]
 mod tests {
     use super::*;