use crate::core::config::TraitBridgeConfig;
use crate::core::ir::ApiSurface;
#[allow(clippy::too_many_arguments)]
pub fn gen_bridge_function(
api: &ApiSurface,
func: &crate::core::ir::FunctionDef,
bridge_param_idx: usize,
bridge_cfg: &TraitBridgeConfig,
mapper: &dyn crate::codegen::type_mapper::TypeMapper,
opaque_types: &ahash::AHashSet<String>,
default_types: &std::collections::HashSet<&str>,
core_import: &str,
) -> String {
use crate::core::ir::TypeRef;
let struct_name = crate::codegen::generators::trait_bridge::bridge_wrapper_name("Rb", bridge_cfg);
let handle_path = crate::codegen::generators::trait_bridge::bridge_handle_path(api, bridge_cfg, core_import);
let param_name = &func.params[bridge_param_idx].name;
let bridge_param = &func.params[bridge_param_idx];
let is_optional = bridge_param.optional || matches!(&bridge_param.ty, TypeRef::Optional(_));
let mut sig_parts = Vec::new();
for (idx, p) in func.params.iter().enumerate() {
if idx == bridge_param_idx {
if is_optional {
sig_parts.push(format!("{}: Option<magnus::Value>", p.name));
} else {
sig_parts.push(format!("{}: magnus::Value", p.name));
}
} else {
let promoted = idx > bridge_param_idx || func.params[..idx].iter().any(|pp| pp.optional);
let ty = if p.optional || promoted {
format!("Option<{}>", mapper.map_type(&p.ty))
} else {
mapper.map_type(&p.ty)
};
sig_parts.push(format!("{}: {}", p.name, ty));
}
}
let params_str = sig_parts.join(", ");
let return_type = mapper.map_type(&func.return_type);
let has_error = func.error_type.is_some();
let ret = mapper.wrap_return(&return_type, has_error);
let err_conv = ".map_err(|e| magnus::Error::new(unsafe { magnus::Ruby::get_unchecked() }.exception_runtime_error(), e.to_string()))";
let bridge_wrap = if is_optional {
format!(
"let {param_name}: Option<{handle_path}> = match {param_name} {{\n \
Some(v) if !v.is_nil() => {{\n \
let bridge = {struct_name}::new(v);\n \
Some(std::sync::Arc::new(std::sync::Mutex::new(bridge)) as {handle_path})\n \
}},\n \
_ => None,\n \
}};"
)
} else {
format!(
"let {param_name} = {{\n \
let bridge = {struct_name}::new({param_name});\n \
std::sync::Arc::new(std::sync::Mutex::new(bridge)) as {handle_path}\n \
}};"
)
};
let serde_bindings: String = func
.params
.iter()
.enumerate()
.filter(|(idx, p)| {
if *idx == bridge_param_idx {
return false;
}
let named = match &p.ty {
TypeRef::Named(n) => Some(n.as_str()),
TypeRef::Optional(inner) => {
if let TypeRef::Named(n) = inner.as_ref() {
Some(n.as_str())
} else {
None
}
}
_ => None,
};
named.is_some_and(|n| !opaque_types.contains(n))
})
.map(|(_, p)| {
let name = &p.name;
let named_type = match &p.ty {
TypeRef::Named(n) => n.clone(),
TypeRef::Optional(inner) => {
if let TypeRef::Named(n) = inner.as_ref() { n.clone() } else { String::new() }
}
_ => String::new(),
};
let core_path = format!("{core_import}::{named_type}");
let is_dt = default_types.contains(named_type.as_str());
if is_dt {
if p.optional || matches!(&p.ty, TypeRef::Optional(_)) {
format!("let {name}_core: Option<{core_path}> = {name}.map(Into::into);\n ")
} else {
format!("let {name}_core: {core_path} = {name}.into();\n ")
}
} else if p.optional || matches!(&p.ty, TypeRef::Optional(_)) {
format!(
"let {name}_core: Option<{core_path}> = {name}.as_deref().filter(|s| *s != \"nil\").map(|s| serde_json::from_str(s){err_conv}).transpose()?;\n "
)
} else {
format!(
"let {name}_core: {core_path} = serde_json::from_str(&{name}){err_conv}?;\n "
)
}
})
.collect();
let call_args: Vec<String> = func
.params
.iter()
.enumerate()
.map(|(idx, p)| {
if idx == bridge_param_idx {
return p.name.clone();
}
match &p.ty {
TypeRef::Named(n) if opaque_types.contains(n.as_str()) => {
if p.optional {
format!("{}.as_ref().map(|v| &v.inner)", p.name)
} else {
format!("&{}.inner", p.name)
}
}
TypeRef::Named(_) => format!("{}_core", p.name),
TypeRef::Optional(inner) => {
if let TypeRef::Named(n) = inner.as_ref() {
if opaque_types.contains(n.as_str()) {
format!("{}.as_ref().map(|v| &v.inner)", p.name)
} else {
format!("{}_core", p.name)
}
} else {
p.name.clone()
}
}
TypeRef::String | TypeRef::Char => {
if p.is_ref {
format!("&{}", p.name)
} else {
p.name.clone()
}
}
_ => p.name.clone(),
}
})
.collect();
let call_args_str = call_args.join(", ");
let core_fn_path = {
let path = func.rust_path.replace('-', "_");
if path.starts_with(core_import) {
path
} else {
format!("{core_import}::{}", func.name)
}
};
let core_call = format!("{core_fn_path}({call_args_str})");
let return_wrap = match &func.return_type {
TypeRef::Named(name) if opaque_types.contains(name.as_str()) => {
format!("{name} {{ inner: std::sync::Arc::new(val) }}")
}
TypeRef::Named(_) => "val.into()".to_string(),
TypeRef::String | TypeRef::Bytes => "val.into()".to_string(),
_ => "val".to_string(),
};
let body = if func.error_type.is_some() {
if return_wrap == "val" {
format!("{bridge_wrap}\n {serde_bindings}{core_call}{err_conv}")
} else {
format!("{bridge_wrap}\n {serde_bindings}{core_call}.map(|val| {return_wrap}){err_conv}")
}
} else {
format!("{bridge_wrap}\n {serde_bindings}{core_call}")
};
let func_name = &func.name;
let mut out = String::with_capacity(1024);
if func.error_type.is_some() {
out.push_str("#[allow(clippy::missing_errors_doc)]\n");
}
out.push_str("#[allow(unused_variables)]\n");
let sig = format!("pub fn {func_name}({params_str}) -> {ret} {{\n {body}\n}}\n");
out.push_str(&sig);
out
}