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use crate::backends::ffi::type_map::is_void_return;
use crate::core::ir::{ParamDef, TypeRef};
use ahash::AHashSet;
use minijinja::context;
use super::super::helpers::null_return_value;
use super::signatures::c_symbol_component;
fn type_ref_to_rust_type(ty: &TypeRef, core_import: &str) -> String {
match ty {
TypeRef::String | TypeRef::Char => "String".to_string(),
TypeRef::Bytes => "Vec<u8>".to_string(),
TypeRef::Primitive(prim) => match prim {
crate::core::ir::PrimitiveType::Bool => "bool".to_string(),
crate::core::ir::PrimitiveType::U8 => "u8".to_string(),
crate::core::ir::PrimitiveType::U16 => "u16".to_string(),
crate::core::ir::PrimitiveType::U32 => "u32".to_string(),
crate::core::ir::PrimitiveType::U64 => "u64".to_string(),
crate::core::ir::PrimitiveType::I8 => "i8".to_string(),
crate::core::ir::PrimitiveType::I16 => "i16".to_string(),
crate::core::ir::PrimitiveType::I32 => "i32".to_string(),
crate::core::ir::PrimitiveType::I64 => "i64".to_string(),
crate::core::ir::PrimitiveType::F32 => "f32".to_string(),
crate::core::ir::PrimitiveType::F64 => "f64".to_string(),
crate::core::ir::PrimitiveType::Usize => "usize".to_string(),
crate::core::ir::PrimitiveType::Isize => "isize".to_string(),
},
TypeRef::Named(name) => format!("{core_import}::{name}"),
TypeRef::Vec(inner) => format!("Vec<{}>", type_ref_to_rust_type(inner, core_import)),
TypeRef::Map(key, val) => format!(
"std::collections::HashMap<{}, {}>",
type_ref_to_rust_type(key, core_import),
type_ref_to_rust_type(val, core_import)
),
TypeRef::Optional(inner) => format!("Option<{}>", type_ref_to_rust_type(inner, core_import)),
TypeRef::Path => "std::path::PathBuf".to_string(),
TypeRef::Json => "serde_json::Value".to_string(),
TypeRef::Duration => "std::time::Duration".to_string(),
TypeRef::Unit => "()".to_string(),
}
}
// ---------------------------------------------------------------------------
// Parameter conversion (C types -> Rust)
// ---------------------------------------------------------------------------
pub(super) fn gen_param_conversion_with_enums(
param: &ParamDef,
has_error: bool,
is_bytes_result: bool,
return_type: &TypeRef,
core_import: &str,
enum_names: &AHashSet<String>,
) -> String {
let name = ¶m.name;
let rs_name = format!("{name}_rs");
let mut out = String::with_capacity(2048);
let fail_ret = if is_bytes_result || (has_error && is_void_return(return_type)) {
"return -1;"
} else if is_void_return(return_type) {
"return;"
} else {
// Use null_return_value to get the correct default for the return type
// (handles primitives, floats, Optional, Duration, pointers)
match null_return_value(return_type) {
"()" => "return;",
v => {
// Leak: we need a 'static str but null_return_value returns &'static str
// The values are all string literals so this is fine
let ret = format!("return {};", v);
// Use a leaked string since fail_ret needs 'static lifetime
// This is called once per function generation, not in a hot loop
Box::leak(ret.into_boxed_str()) as &str
}
}
};
if param.optional {
// Optional parameter — null means None
match ¶m.ty {
TypeRef::String | TypeRef::Char => {
out.push_str(&crate::backends::ffi::template_env::render(
"param_optional_string_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
fail_ret => fail_ret.to_string(),
},
));
}
TypeRef::Path => {
out.push(' ');
out.push_str(&crate::backends::ffi::template_env::render(
"param_path_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
is_ref => param.is_ref,
fail_ret => fail_ret.to_string(),
},
));
}
TypeRef::Json => {
out.push_str(&crate::backends::ffi::template_env::render(
"param_optional_json_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
fail_ret => fail_ret.to_string(),
turbofish => String::new(),
},
));
}
TypeRef::Named(type_name) if enum_names.contains(type_name.as_str()) => {
// Optional enum passed as i32 sentinel: reconstruct via private Rust helper.
// Use match+explicit return rather than `?` because the outer function may return
// *mut T or i32, not Result/Option, so the ? operator is unavailable.
//
// IMPORTANT: the local variable name is `{rs_name}` (derived from the FFI param
// name), NOT from `enum_snake` (which is derived from the type name). The
// conversion helper is named `{enum_snake}_from_i32_rs` and receives `{name}`
// (the actual FFI param), not `{enum_snake}` which may differ when param name
// != snake_case(type_name) (e.g. param `strategy` of type `RedactionStrategy`).
let enum_snake = c_symbol_component(type_name);
out.push_str(&crate::backends::ffi::template_env::render(
"ffi_enum_discriminant_match.jinja",
context! {
rs_name => rs_name.clone(),
enum_snake => enum_snake,
name => name.clone(),
error_message => format!("invalid enum discriminant for {type_name}"),
fail_ret => fail_ret,
},
));
}
TypeRef::Named(_type_name) => {
out.push_str(&crate::backends::ffi::template_env::render(
"param_optional_named_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
is_ref => param.is_ref,
},
));
}
TypeRef::Primitive(crate::core::ir::PrimitiveType::Bool) => {
out.push(' ');
out.push_str(&crate::backends::ffi::template_env::render(
"param_optional_bool_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
},
));
}
TypeRef::Primitive(prim) => {
// Optional numeric primitive: max value of type = None
let max_val = match prim {
crate::core::ir::PrimitiveType::U8 => "u8::MAX",
crate::core::ir::PrimitiveType::U16 => "u16::MAX",
crate::core::ir::PrimitiveType::U32 => "u32::MAX",
crate::core::ir::PrimitiveType::U64 => "u64::MAX",
crate::core::ir::PrimitiveType::I8 => "i8::MAX",
crate::core::ir::PrimitiveType::I16 => "i16::MAX",
crate::core::ir::PrimitiveType::I32 => "i32::MAX",
crate::core::ir::PrimitiveType::I64 => "i64::MAX",
crate::core::ir::PrimitiveType::F32 => "f32::NAN",
crate::core::ir::PrimitiveType::F64 => "f64::NAN",
crate::core::ir::PrimitiveType::Usize => "usize::MAX",
crate::core::ir::PrimitiveType::Isize => "isize::MAX",
crate::core::ir::PrimitiveType::Bool => unreachable!("handled above"),
};
let is_float = matches!(
prim,
crate::core::ir::PrimitiveType::F32 | crate::core::ir::PrimitiveType::F64
);
out.push(' ');
out.push_str(&crate::backends::ffi::template_env::render(
"param_optional_numeric_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
max_val => max_val,
is_float => is_float,
},
));
}
TypeRef::Vec(_) | TypeRef::Map(_, _) => {
// Optional Vec/Map: deserialize from JSON string
let type_hint = match ¶m.ty {
TypeRef::Vec(_) => {
format!("::<{}>", type_ref_to_rust_type(¶m.ty, core_import))
}
TypeRef::Map(_, val_ty) if param.map_is_ahash => {
// AHashMap target: deserialize directly into AHashMap with the correct
// key type so no post-deserialization conversion is needed.
let val_rust = type_ref_to_rust_type(val_ty, core_import);
let key_rust = if param.map_key_is_cow {
"std::borrow::Cow<'static, str>".to_string()
} else {
"String".to_string()
};
format!("::<ahash::AHashMap<{key_rust}, {val_rust}>>")
}
TypeRef::Map(_, _) => {
format!("::<{}>", type_ref_to_rust_type(¶m.ty, core_import))
}
_ => String::new(),
};
out.push(' ');
out.push_str(&crate::backends::ffi::template_env::render(
"param_optional_vec_map_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
turbofish => type_hint,
fail_ret => fail_ret.to_string(),
},
));
}
_ => {
// Fallback: treat as nullable JSON string
out.push_str(&crate::backends::ffi::template_env::render(
"param_optional_fallback.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
fail_ret => fail_ret.to_string(),
},
));
}
}
} else {
match ¶m.ty {
TypeRef::String | TypeRef::Char => {
out.push_str(&crate::backends::ffi::template_env::render(
"param_non_optional_string_conversion.jinja",
context! {
name => name.clone(),
fail_ret => fail_ret.to_string(),
rs_name => rs_name.clone(),
},
));
}
TypeRef::Path => {
out.push_str(&crate::backends::ffi::template_env::render(
"param_non_optional_path_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
fail_ret => fail_ret.to_string(),
},
));
}
TypeRef::Json => {
let turbofish = String::new();
let mut_keyword = String::new();
out.push_str(&crate::backends::ffi::template_env::render(
"param_non_optional_json_conversion.jinja",
context! {
name => name.clone(),
fail_ret => fail_ret.to_string(),
rs_name => rs_name.clone(),
turbofish => turbofish,
mut_keyword => mut_keyword,
},
));
}
TypeRef::Primitive(prim) => match prim {
crate::core::ir::PrimitiveType::Bool => {
out.push_str(&crate::backends::ffi::template_env::render(
"param_primitive_bool.jinja",
context! { rs_name => rs_name.clone(), name => name.clone() },
));
}
_ => {
if let Some(newtype_path) = ¶m.newtype_wrapper {
// Param was resolved from a newtype (e.g. NodeIndex→u32): re-wrap for core call.
out.push_str(&crate::backends::ffi::template_env::render("param_primitive_newtype.jinja", context! { rs_name => rs_name.clone(), newtype_path => newtype_path.clone(), name => name.clone() }));
} else {
out.push_str(&crate::backends::ffi::template_env::render(
"param_primitive_passthrough.jinja",
context! { rs_name => rs_name.clone(), name => name.clone() },
));
}
}
},
TypeRef::Named(type_name) if enum_names.contains(type_name.as_str()) => {
// Enum passed as i32: reconstruct using the private Rust helper.
// Use match+explicit return rather than `?` because the outer function may return
// *mut T or i32, not Result/Option, so the ? operator is unavailable.
//
// IMPORTANT: the local variable name is `{rs_name}` (derived from the FFI param
// name, e.g. `strategy_rs`), NOT `{enum_snake}_rs` (which would use the type
// name, e.g. `redaction_strategy_rs`). The conversion helper is still named
// `{enum_snake}_from_i32_rs` but it receives `{name}` (the actual FFI param).
// This fixes the mismatch when param name != snake_case(type_name).
let enum_snake = c_symbol_component(type_name);
out.push_str(&crate::backends::ffi::template_env::render(
"ffi_enum_discriminant_match.jinja",
context! {
rs_name => rs_name.clone(),
enum_snake => enum_snake,
name => name.clone(),
error_message => format!("invalid enum discriminant for {type_name}"),
fail_ret => fail_ret,
},
));
}
TypeRef::Named(_type_name) => {
out.push_str(&crate::backends::ffi::template_env::render(
"param_non_optional_named_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
fail_ret => fail_ret.to_string(),
is_ref => param.is_ref,
is_mut => param.is_mut,
},
));
}
TypeRef::Bytes => {
// Bytes come as (*const u8, len: usize) — the len param is a separate
// parameter named {name}_len by convention. A null pointer is allowed
// when the corresponding length is zero (empty input is a legitimate
// case — e.g. extracting from a 0-byte file). Reject null only when
// the caller claims a non-zero length.
out.push_str(&crate::backends::ffi::template_env::render(
"param_non_optional_bytes_conversion.jinja",
context! {
rs_name => rs_name.clone(),
name => name.clone(),
fail_ret => fail_ret.to_string(),
},
));
}
TypeRef::Vec(_) | TypeRef::Map(_, _) => {
// Passed as JSON string
let mut_keyword = if param.is_mut { "mut " } else { "" };
let type_hint = match ¶m.ty {
TypeRef::Vec(_) => {
format!("::<{}>", type_ref_to_rust_type(¶m.ty, core_import))
}
TypeRef::Map(_, val_ty) if param.map_is_ahash => {
// AHashMap target: deserialize directly.
let val_rust = type_ref_to_rust_type(val_ty, core_import);
let key_rust = if param.map_key_is_cow {
"std::borrow::Cow<'static, str>".to_string()
} else {
"String".to_string()
};
format!("::<ahash::AHashMap<{key_rust}, {val_rust}>>")
}
TypeRef::Map(_, _) => {
format!("::<{}>", type_ref_to_rust_type(¶m.ty, core_import))
}
_ => String::new(),
};
out.push_str(&crate::backends::ffi::template_env::render(
"param_non_optional_json_conversion.jinja",
context! {
name => name.clone(),
fail_ret => fail_ret.to_string(),
rs_name => rs_name.clone(),
turbofish => type_hint,
mut_keyword => mut_keyword,
},
));
}
TypeRef::Optional(_) => {
// Should not happen for non-optional param, but handle gracefully
out.push_str(&crate::backends::ffi::template_env::render(
"param_optional_passthrough.jinja",
context! { rs_name => rs_name.clone(), name => name.clone() },
));
}
TypeRef::Duration => {
// Duration passed as u64 milliseconds
out.push_str(&crate::backends::ffi::template_env::render(
"param_duration_conversion.jinja",
context! { rs_name => rs_name.clone(), name => name.clone() },
));
}
TypeRef::Unit => {
// No parameter to convert
}
}
}
out
}