Function resolveRustType

scripts/codegen/rust.ts:630–842

* Map a JSON Schema to a Rust type string. Emits nested type definitions as * side effects into ctx.

(
	propSchema: JSONSchema7,
	parentTypeName: string,
	jsonPropName: string,
	isRequired: boolean,
	ctx: RustCodegenCtx,
)

 * side effects into ctx.
 */
function resolveRustType(
	propSchema: JSONSchema7,
	parentTypeName: string,
	jsonPropName: string,
	isRequired: boolean,
	ctx: RustCodegenCtx,
): string {
	const nestedName = parentTypeName + toPascalCase(jsonPropName);

	// $ref — resolve and recurse
	if (propSchema.$ref && typeof propSchema.$ref === "string") {
		recordExternalRustTypeRef(propSchema.$ref, ctx);
		const typeName = rustRefTypeName(propSchema.$ref, ctx.definitions);
		const resolved = resolveRef(propSchema.$ref, ctx.definitions);
		if (resolved) {
			if (resolved.enum) {
				emitRustStringEnum(
					typeName,
					resolved.enum as string[],
					ctx,
					resolved.description,
					getEnumValueDescriptions(resolved),
					isSchemaExperimental(resolved),
				);
				return wrapOption(typeName, isRequired);
			}
			if (isObjectSchema(resolved)) {
				emitRustStruct(typeName, resolved, ctx);
				return wrapOption(typeName, isRequired);
			}
			return resolveRustType(
				resolved,
				parentTypeName,
				jsonPropName,
				isRequired,
				ctx,
			);
		}
		return wrapOption(typeName, isRequired);
	}

	// anyOf — nullable pattern or union
	if (propSchema.anyOf) {
		const unionType = tryEmitRustUnion(
			propSchema,
			parentTypeName,
			jsonPropName,
			ctx,
		);
		if (unionType) {
			return wrapOption(unionType, isRequired);
		}

		const nonNull = (propSchema.anyOf as JSONSchema7[]).filter(
			(s) => s.type !== "null",
		);
		const hasNull = (propSchema.anyOf as JSONSchema7[]).some(
			(s) => s.type === "null",