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use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Hash, JsonSchema)]
#[serde(rename_all = "lowercase")]
pub enum Language {
Python,
Node,
Ruby,
Php,
Elixir,
Wasm,
Ffi,
Go,
Java,
Csharp,
R,
Rust,
Kotlin,
#[serde(rename = "kotlin_android", alias = "kotlin-android")]
KotlinAndroid,
Swift,
Dart,
Gleam,
Zig,
/// C consumer of the FFI layer — e2e test target, not a generated binding.
C,
/// Rust JNI shim crate emitter — paired with kotlin-android.
/// Emits `Java_*` symbols that mirror the Kotlin Bridge `external fun` declarations.
#[serde(rename = "jni")]
Jni,
}
impl Language {
/// ~keep Every `Language` variant, so name lists can be derived from the enum
/// rather than hand-maintained alongside it. Enumerated by hand because
/// `Language` has no derive-based variant iterator.
pub const ALL: [Language; 20] = [
Self::Python,
Self::Node,
Self::Ruby,
Self::Php,
Self::Elixir,
Self::Wasm,
Self::Ffi,
Self::Go,
Self::Java,
Self::Csharp,
Self::R,
Self::Rust,
Self::Kotlin,
Self::KotlinAndroid,
Self::Swift,
Self::Dart,
Self::Gleam,
Self::Zig,
Self::C,
Self::Jni,
];
/// Comma-joined canonical names of every `Language` variant, derived from [`Self::ALL`]
/// and [`Display`](std::fmt::Display) rather than a second hand-typed list. Used to build
/// "valid names are: ..." validation messages so they cannot drift from the enum they
/// describe.
#[must_use]
pub fn all_names_joined() -> String {
Self::ALL.iter().map(ToString::to_string).collect::<Vec<_>>().join(", ")
}
}
impl std::fmt::Display for Language {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Python => write!(f, "python"),
Self::Node => write!(f, "node"),
Self::Ruby => write!(f, "ruby"),
Self::Php => write!(f, "php"),
Self::Elixir => write!(f, "elixir"),
Self::Wasm => write!(f, "wasm"),
Self::Ffi => write!(f, "ffi"),
Self::Go => write!(f, "go"),
Self::Java => write!(f, "java"),
Self::Csharp => write!(f, "csharp"),
Self::R => write!(f, "r"),
Self::Rust => write!(f, "rust"),
Self::Kotlin => write!(f, "kotlin"),
Self::KotlinAndroid => write!(f, "kotlin_android"),
Self::Swift => write!(f, "swift"),
Self::Dart => write!(f, "dart"),
Self::Gleam => write!(f, "gleam"),
Self::Zig => write!(f, "zig"),
Self::C => write!(f, "c"),
Self::Jni => write!(f, "jni"),
}
}
}
/// A parameter in an adapter function.
#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields)]
pub struct AdapterParam {
pub name: String,
#[serde(rename = "type")]
pub ty: String,
#[serde(default)]
pub optional: bool,
}
/// The kind of adapter pattern.
#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
#[serde(rename_all = "snake_case")]
pub enum AdapterPattern {
SyncFunction,
AsyncMethod,
CallbackBridge,
Streaming,
}
/// Configuration for a single adapter.
#[derive(Debug, Clone, Serialize, Deserialize, JsonSchema)]
#[serde(deny_unknown_fields)]
pub struct AdapterConfig {
pub name: String,
pub pattern: AdapterPattern,
/// Full Rust path to the core function/method (e.g., "sample_markdown_rs::convert")
pub core_path: String,
/// Parameters
#[serde(default)]
pub params: Vec<AdapterParam>,
/// Return type name
pub returns: Option<String>,
/// Error type name
pub error_type: Option<String>,
/// For async_method/streaming: the owning type name
pub owner_type: Option<String>,
/// For streaming: the item type
pub item_type: Option<String>,
/// For Python: release GIL during call
#[serde(default)]
pub gil_release: bool,
/// For callback_bridge: the Rust trait to implement (e.g., "MyHandler")
#[serde(default)]
pub trait_name: Option<String>,
/// For callback_bridge: the trait method name (e.g., "handle")
#[serde(default)]
pub trait_method: Option<String>,
/// For callback_bridge: whether to detect async callbacks at construction time
#[serde(default)]
pub detect_async: bool,
/// For streaming (FFI backend): full Rust type path of the request payload
/// deserialised from JSON (e.g. `"my_crate::ChatCompletionRequest"`).
/// Required when generating FFI streaming bodies — codegen will hard-fail
/// with a clear error if this field is absent on a streaming adapter.
#[serde(default)]
pub request_type: Option<String>,
/// Language backends for which this adapter should NOT be emitted.
///
/// Mirrors the same field on `[[crates.e2e.calls.*]]`. Useful when a
/// consumer's core crate cannot compile on a given target (e.g.
/// a streaming crate on `wasm32-unknown-unknown` which has no working async
/// runtime for streaming). The adapter remains declared for every backend
/// where it works, with explicit per-backend opt-out rather than removing
/// the adapter entirely.
///
/// Values must match a canonical [`Language`] name (see [`Language::ALL`]).
/// An unknown name fails at config-resolve time.
///
/// Example: `skip_languages = ["wasm", "kotlin"]`
#[serde(default)]
pub skip_languages: Vec<String>,
}
/// Returns `true` when `lang_str` is a recognised canonical language name.
///
/// Derived from [`Language::ALL`] rather than a second hand-typed name list, so a variant
/// added to the enum is recognised here without a separate edit to keep in sync.
pub fn is_known_language(lang_str: &str) -> bool {
Language::ALL.iter().any(|language| language.to_string() == lang_str)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn adapter_config_skip_languages_deserializes() {
let toml_str = r#"
name = "crawl_stream"
pattern = "streaming"
core_path = "sample_crawler_core::crawl_stream"
owner_type = "CrawlEngine"
item_type = "CrawlResult"
skip_languages = ["wasm", "kotlin"]
"#;
let config: AdapterConfig = toml::from_str(toml_str).expect("deserialization failed");
assert_eq!(config.skip_languages, vec!["wasm", "kotlin"]);
assert_eq!(config.name, "crawl_stream");
}
#[test]
fn adapter_config_skip_languages_defaults_to_empty() {
let toml_str = r#"
name = "crawl_stream"
pattern = "streaming"
core_path = "sample_crawler_core::crawl_stream"
"#;
let config: AdapterConfig = toml::from_str(toml_str).expect("deserialization failed");
assert!(config.skip_languages.is_empty());
}
/// Iterates `Language::ALL` rather than a hand-typed name list, so this test stays coupled
/// to the enum instead of drifting alongside a second copy of it: a variant whose canonical
/// name `is_known_language` fails to recognise is caught here without editing the test.
#[test]
fn is_known_language_accepts_every_all_variant() {
for language in Language::ALL {
let name = language.to_string();
assert!(is_known_language(&name), "{name} should be recognised");
}
}
#[test]
fn is_known_language_rejects_unknown() {
assert!(!is_known_language("wasm32"));
assert!(!is_known_language("kotlin-android"));
assert!(!is_known_language(""));
}
#[test]
fn all_lists_every_variant() {
for language in Language::ALL {
// ~keep: exhaustive over Language, so adding a variant stops this file
// compiling until it is also added to ALL — nothing else enforces that.
match language {
Language::Python
| Language::Node
| Language::Ruby
| Language::Php
| Language::Elixir
| Language::Wasm
| Language::Ffi
| Language::Go
| Language::Java
| Language::Csharp
| Language::R
| Language::Rust
| Language::Kotlin
| Language::KotlinAndroid
| Language::Swift
| Language::Dart
| Language::Gleam
| Language::Zig
| Language::C
| Language::Jni => {}
}
}
let distinct: std::collections::HashSet<String> = Language::ALL.iter().map(ToString::to_string).collect();
assert_eq!(
distinct.len(),
Language::ALL.len(),
"Language::ALL must not repeat a variant"
);
}
}