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,
_cfg: &crate::codegen::generators::RustBindingConfig<'_>,
_adapter_bodies: &crate::codegen::generators::AdapterBodies,
opaque_types: &ahash::AHashSet<String>,
core_import: &str,
) -> String {
use crate::core::ir::TypeRef;
let struct_name = crate::codegen::generators::trait_bridge::bridge_wrapper_name("Js", 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 is_options_field_binding = matches!(bridge_cfg.bind_via, crate::core::config::BridgeBinding::OptionsField);
let options_param_idx = if is_options_field_binding {
func.params.iter().enumerate().find(|(_, p)| {
matches!(&p.ty, TypeRef::Named(n) if bridge_cfg.options_type.as_ref().is_some_and(|opt_type| n == opt_type))
}).map(|(i, _)| i)
} else {
None
};
let mut sig_parts = vec![];
for (idx, p) in func.params.iter().enumerate() {
if is_options_field_binding && Some(idx) == options_param_idx {
let ty = if p.optional || (idx > 0 && func.params[..idx].iter().any(|pp| pp.optional)) {
format!("Option<{}>", mapper.map_type(&p.ty))
} else {
mapper.map_type(&p.ty)
};
sig_parts.push(format!("{}: {}", p.name, ty));
} else if idx == bridge_param_idx {
if is_optional {
sig_parts.push(format!("{}: Option<napi::bindgen_prelude::Object>", p.name));
} else {
sig_parts.push(format!("{}: napi::bindgen_prelude::Object", 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 ret = mapper.wrap_return(&return_type, func.error_type.is_some());
let err_conv = ".map_err(|e| napi::Error::new(napi::Status::GenericFailure, e.to_string()))";
let bridge_wrap = if is_optional {
crate::backends::napi::template_env::render(
"bridge_optional_wrap.jinja",
minijinja::context! {
param_name => param_name,
struct_name => struct_name,
handle_path => handle_path,
},
)
} else {
crate::backends::napi::template_env::render(
"bridge_required_wrap.jinja",
minijinja::context! {
param_name => param_name,
struct_name => struct_name,
handle_path => handle_path,
},
)
};
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 core_path = format!(
"{core_import}::{}",
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 template_name = if p.optional || matches!(&p.ty, TypeRef::Optional(_)) {
"named_core_binding_optional.jinja"
} else {
"named_core_binding_required.jinja"
};
crate::backends::napi::template_env::render(
template_name,
minijinja::context! {
name => name,
core_path => core_path,
},
)
})
.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 = render_bridge_function_body(
func.error_type.is_some(),
&return_wrap,
&bridge_wrap,
&serde_bindings,
&core_call,
err_conv,
);
let js_name = {
let mut result = String::with_capacity(func.name.len());
let mut capitalize_next = false;
for (i, c) in func.name.chars().enumerate() {
if c == '_' {
capitalize_next = true;
} else if capitalize_next {
result.extend(c.to_uppercase());
capitalize_next = false;
} else if i == 0 {
result.extend(c.to_lowercase());
} else {
result.push(c);
}
}
result
};
let js_name_attr = if js_name != func.name {
format!("(js_name = \"{}\")", js_name)
} else {
String::new()
};
let func_name = &func.name;
crate::backends::napi::template_env::render(
"bridge_function.jinja",
minijinja::context! {
has_error => func.error_type.is_some(),
js_name_attr => js_name_attr,
func_name => func_name,
params_str => params_str,
ret => ret,
body => body,
},
)
}
fn render_bridge_function_body(
has_error: bool,
return_wrap: &str,
bridge_wrap: &str,
serde_bindings: &str,
core_call: &str,
err_conv: &str,
) -> String {
let template_name = match (has_error, return_wrap == "val") {
(true, true) => "bridge_function_body_error.jinja",
(true, false) => "bridge_function_body_error_mapped.jinja",
(false, _) => "bridge_function_body_plain.jinja",
};
crate::backends::napi::template_env::render(
template_name,
minijinja::context! {
bridge_wrap => bridge_wrap,
serde_bindings => serde_bindings,
core_call => core_call,
err_conv => err_conv,
return_wrap => return_wrap,
},
)
}