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A human-friendly DSL for ATProto Lexicons
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12 kB · 295 lines
Rust
at commit 97e80422
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pub struct RustGenerator;
impl RustGenerator { pub const NAME: &'static str = "rust";
fn to_snake_case(&self, s: &str) -> String { let mut result = String::new(); for (i, ch) in s.chars().enumerate() { if ch.is_uppercase() && i > 0 { result.push('_'); } result.push(ch.to_lowercase().next().unwrap()); } result }
fn to_pascal_case(&self, s: &str) -> String { let mut chars = s.chars(); match chars.next() { None => String::new(), Some(f) => f.to_uppercase().collect::<String>() + chars.as_str(), } }
fn generate_type( &self, ty: &Type, optional: bool, ctx: &GeneratorContext, ) -> Result<String, String> { let base_type = match ty { Type::Primitive { kind, .. } => match kind { PrimitiveType::Null => "()".to_string(), // Unit type for null PrimitiveType::Boolean => "bool".to_string(), PrimitiveType::Integer => "i64".to_string(), PrimitiveType::String => "String".to_string(), PrimitiveType::Bytes => "Vec<u8>".to_string(), PrimitiveType::Blob => "Vec<u8>".to_string(), // Annotation idea: @rustType("custom::BlobType") }, Type::Reference { path, .. } => { let path_str = path.to_string(); match path_str.as_str() { // Map standard library types "Datetime" => "String".to_string(), // ISO 8601 string, could use chrono::DateTime "Did" | "AtUri" | "Cid" | "AtIdentifier" | "Handle" | "Nsid" | "Tid" | "RecordKey" | "Uri" | "Language" => "String".to_string(), _ => { // Local reference - convert to PascalCase self.to_pascal_case(&path.segments.last().unwrap().name) } } } Type::Array { inner, .. } => { let inner_type = self.generate_type(inner, false, ctx)?; format!("Vec<{}>", inner_type) } Type::Union { types, .. } => { // Rust doesn't have direct union types, use an enum // For now, generate a simple representation // Annotation idea: @rustEnum to customize enum generation if types.len() == 2 && matches!( types[0], Type::Primitive { kind: PrimitiveType::Null, .. } ) { // Special case: null | T becomes Option<T> return self.generate_type(&types[1], true, ctx); } else if types.len() == 2 && matches!( types[1], Type::Primitive { kind: PrimitiveType::Null, .. } ) { return self.generate_type(&types[0], true, ctx); } // Otherwise use serde_json::Value for flexibility "serde_json::Value".to_string() } Type::Object { .. } => { // Inline struct types aren't idiomatic in Rust // We'd need to generate a named type // For now, use serde_json::Value // Annotation idea: @rustInlineStruct to force inline generation "serde_json::Value".to_string() } Type::Parenthesized { inner, .. } => { return self.generate_type(inner, optional, ctx); } Type::Constrained { base, .. } => { return self.generate_type(base, optional, ctx); } Type::Unknown { .. } => "serde_json::Value".to_string(), };
if optional { Ok(format!("Option<{}>", base_type)) } else { Ok(base_type) } }
fn generate_doc_comment(&self, docs: &[DocComment]) -> String { if docs.is_empty() { return String::new(); }
let mut result = String::new(); for doc in docs { result.push_str("/// "); result.push_str(&doc.text); result.push('\n'); } result }}
impl CodeGenerator for RustGenerator { fn name(&self) -> &'static str { Self::NAME }
fn description(&self) -> &'static str { "Generate Rust structs and client code" }
fn file_extension(&self) -> &'static str { ".rs" }
fn generate(&self, ctx: &GeneratorContext) -> Result<String, String> { let mut output = String::new();
// Header comment writeln!(output, "// Generated from {}", ctx.namespace).unwrap(); writeln!(output, "// Do not edit manually").unwrap(); writeln!(output).unwrap();
// Common imports writeln!(output, "use serde::{{Deserialize, Serialize}};\n").unwrap();
// Generate code for each item for item in &ctx.lexicon.items { match item { Item::Record(record) => { output.push_str(&self.generate_doc_comment(&record.docs)); writeln!(output, "#[derive(Debug, Clone, Serialize, Deserialize)]").unwrap(); writeln!( output, "pub struct {} {{", self.to_pascal_case(&record.name.name) ) .unwrap();
for field in &record.fields { if !field.docs.is_empty() { writeln!(output, " /// {}", field.docs[0].text).unwrap(); }
// Use serde rename for camelCase fields if field.name.name != self.to_snake_case(&field.name.name) { writeln!(output, " #[serde(rename = \"{}\")]", field.name.name) .unwrap(); }
// Skip serializing None values for optional fields if field.optional { writeln!( output, " #[serde(skip_serializing_if = \"Option::is_none\")]" ) .unwrap(); }
let field_type = self.generate_type(&field.ty, field.optional, ctx)?; writeln!( output, " pub {}: {},", self.to_snake_case(&field.name.name), field_type ) .unwrap(); }
writeln!(output, "}}\n").unwrap(); } Item::DefType(def) => { output.push_str(&self.generate_doc_comment(&def.docs));
match &def.ty { Type::Object { fields, .. } => { // Generate a struct for object types writeln!(output, "#[derive(Debug, Clone, Serialize, Deserialize)]") .unwrap(); writeln!( output, "pub struct {} {{", self.to_pascal_case(&def.name.name) ) .unwrap();
for field in fields { if !field.docs.is_empty() { writeln!(output, " /// {}", field.docs[0].text).unwrap(); }
if field.name.name != self.to_snake_case(&field.name.name) { writeln!( output, " #[serde(rename = \"{}\")]", field.name.name ) .unwrap(); }
if field.optional { writeln!( output, " #[serde(skip_serializing_if = \"Option::is_none\")]" ) .unwrap(); }
let field_type = self.generate_type(&field.ty, field.optional, ctx)?; writeln!( output, " pub {}: {},", self.to_snake_case(&field.name.name), field_type ) .unwrap(); }
writeln!(output, "}}\n").unwrap(); } _ => { // Type alias writeln!( output, "pub type {} = {};\n", self.to_pascal_case(&def.name.name), self.generate_type(&def.ty, false, ctx)? ) .unwrap(); } } } Item::InlineType(inline) => { output.push_str(&self.generate_doc_comment(&inline.docs)); writeln!( output, "pub type {} = {};\n", self.to_pascal_case(&inline.name.name), self.generate_type(&inline.ty, false, ctx)? ) .unwrap(); } Item::Token(token) => { output.push_str(&self.generate_doc_comment(&token.docs)); writeln!( output, "pub const {}: &str = \"{}\";\n", token.name.name.to_uppercase(), token.name.name ) .unwrap(); } Item::Query(_) | Item::Procedure(_) | Item::Subscription(_) => { // TODO: Generate client methods } Item::Use(_) | Item::SelfItem(_) => { // Skip `use` statements and the `self { }` item — both // are lexicon-level metadata, not types to emit. } } }
Ok(output) }}
// Register the Rust generatorpub static RUST_GENERATOR: RustGenerator = RustGenerator;register_generator!(RUST_GENERATOR);