alef 0.82.2

Opinionated polyglot binding generator for Rust libraries
Documentation 
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use super::*;
use crate::core::ir::ReceiverKind;
use std::collections::HashMap;

fn mapper() -> WasmMapper {
    WasmMapper::new(HashMap::new(), "Wasm".to_string())
}

/// A static `default()` method, as synthesized from a type's own custom `impl Default` (not
/// `#[derive(Default)]`) — the shape that put a bare-name path into `core_call` in the first
/// place: `gen_struct_methods` only falls back to the synthetic `<Wasm{T} as Default>::default()`
/// wrapper when `typ.methods` has no `default` entry, so a real custom `impl Default` routes
/// through this generic static-method path instead.
fn default_method(return_type_name: &str) -> MethodDef {
    MethodDef {
        name: "default".to_string(),
        is_static: true,
        return_type: TypeRef::Named(return_type_name.to_string()),
        receiver: None,
        ..Default::default()
    }
}

/// Regression coverage: a type whose `rust_path` nests it under a private module (mirroring
/// a real consumer shape where the type is never re-exported at the crate root)
/// must have its static core call built from that full module path, not from
/// `{core_import}::{typ.name}`. Before the fix, `gen_method`'s static branch built the call as
/// `format!("{core_import}::{type_name}::{method}(...)")`, ignoring `typ.rust_path` entirely —
/// for `RenderOptions` nested under `core::config::render`, that produced
/// `sample_core::RenderOptions::default()`, which rustc rejects with
/// "cannot find `RenderOptions` in `sample_core`" even though the feature gating the type is on.
#[test]
fn gen_method_static_default_uses_full_rust_path_for_nested_type() {
    let typ = TypeDef {
        name: "RenderOptions".to_string(),
        rust_path: "sample_core::config::render::RenderOptions".to_string(),
        ..Default::default()
    };
    let method = default_method("RenderOptions");

    let out = gen_method(
        &method,
        &mapper(),
        "RenderOptions",
        "sample_core",
        &AHashSet::default(),
        "Wasm",
        &typ,
        &AHashSet::default(),
        &ahash::AHashMap::default(),
    );

    assert!(
        out.contains("sample_core::config::render::RenderOptions::default()"),
        "static default() must call the type's real module path: {out}"
    );
    assert!(
        !out.contains("sample_core::RenderOptions::default()"),
        "static default() must not assume the type is re-exported at the crate root: {out}"
    );
}

/// Negative control: when the type genuinely does live at the crate root — `rust_path` has no
/// `::` beyond what `core_type_path` treats as bare — the call still resolves to
/// `{core_import}::{name}`. This proves the fix is a real path lookup, not a blanket rewrite
/// that always nests the call under some fixed module.
#[test]
fn gen_method_static_default_uses_bare_path_for_root_type() {
    let typ = TypeDef {
        name: "PlainOptions".to_string(),
        rust_path: "PlainOptions".to_string(),
        ..Default::default()
    };
    let method = default_method("PlainOptions");

    let out = gen_method(
        &method,
        &mapper(),
        "PlainOptions",
        "sample_core",
        &AHashSet::default(),
        "Wasm",
        &typ,
        &AHashSet::default(),
        &ahash::AHashMap::default(),
    );

    assert!(
        out.contains("sample_core::PlainOptions::default()"),
        "a crate-root type must still resolve to `{{core_import}}::{{name}}`: {out}"
    );
}

/// Same defect, different call shape: a non-static instance method on a nested type used
/// `format!("{core_import}::{type_name}::from(self.clone())...")`. Cover it too, since it shares
/// the same bare-name assumption and the same `qualified_type_path` fix.
#[test]
fn gen_method_instance_delegate_uses_full_rust_path_for_nested_type() {
    let typ = TypeDef {
        name: "RenderOptions".to_string(),
        rust_path: "sample_core::config::render::RenderOptions".to_string(),
        ..Default::default()
    };
    let method = MethodDef {
        name: "is_sane".to_string(),
        is_static: false,
        return_type: TypeRef::Primitive(crate::core::ir::PrimitiveType::Bool),
        receiver: Some(ReceiverKind::Ref),
        ..Default::default()
    };

    let out = gen_method(
        &method,
        &mapper(),
        "RenderOptions",
        "sample_core",
        &AHashSet::default(),
        "Wasm",
        &typ,
        &AHashSet::default(),
        &ahash::AHashMap::default(),
    );

    assert!(
        out.contains("sample_core::config::render::RenderOptions::from(self.clone())"),
        "instance delegation must call the type's real module path: {out}"
    );
    assert!(
        !out.contains("sample_core::RenderOptions::from(self.clone())"),
        "instance delegation must not assume the type is re-exported at the crate root: {out}"
    );
}