Module miniextendr_fn 

Function signature parsing for #[miniextendr].

This module handles parsing and normalizing Rust function signatures for the #[miniextendr] attribute macro. It provides:

• MiniextendrFunctionParsed: Parsed function with normalization and codegen helpers
• MiniextendrFnAttrs: Parsed #[miniextendr(...)] attribute options
• CoercionMapping: Type coercion analysis for automatic R→Rust conversion

Structs

MiniextendrFnAttrs 🔒

Parsed arguments for the #[miniextendr(...)] attribute on functions.

MiniextendrFunctionParsed 🔒

Parsed + normalized Rust function item for #[miniextendr].

ParamAttrs 🔒

Collapsed per-parameter attribute state for a single function parameter.

PerParamMiniextendrAttr 🔒

Parsed per-parameter #[miniextendr(...)] attribute content.

ROnExit 🔒

Parsed r_on_exit attribute for on.exit() cleanup code in R wrappers.

Enums

CoercionMapping 🔒

Result of coercion analysis for a type. Contains the R native type to extract from SEXP and the target type to coerce to.

ReturnPref 🔒

Preferred return-conversion path for IntoR.

Constants

FN_BOOL_FLAGS_HELP 🔒

Comma-separated list of all fn-level boolean flags, for error messages.

FN_NESTED_OPTIONS_HELP 🔒

Comma-separated list of fn-level nested options, for error messages.

Functions

get_missing_inner_type 🔒

Extract the inner type T from Missing<T>, if the type is Missing<T>.

is_dots_type 🔒

Check if a type is Dots or &Dots (the variadic ... parameter type).

is_miniextendr_choices_attr 🔒

Returns true if attr is a #[miniextendr(...)] attribute containing choices(...).

is_miniextendr_coerce_attr 🔒

Returns true if attr is a #[miniextendr(...)] attribute containing coerce.

is_miniextendr_match_arg_attr 🔒

Returns true if attr is a #[miniextendr(...)] attribute containing match_arg.

is_miniextendr_several_ok_attr 🔒

Returns true if attr is a #[miniextendr(...)] attribute containing several_ok.

is_missing_type 🔒

Check if a type is Missing<T>.

is_vector_like_type 🔒

Check if a type is a vector-like type that several_ok can populate.

parse_choices_attr 🔒

Extracts the list of choice strings from a #[miniextendr(choices("a", "b", "c"))] attribute.

parse_default_attr 🔒

Extracts the default value from a #[miniextendr(default = "...")] attribute.

parse_lit_str 🔒

Parse the value of a name = "..." meta item as a string literal.

parse_per_param_attr 🔒

Parse all per-parameter options from a #[miniextendr(...)] attribute.

type_ends_with 🔒

Check if a type path ends with the given identifier (e.g., “Dots”, “Missing”).

validate_param_type 🔒

Validate a parameter’s type for Missing and Dots conflicts.

validate_per_param_attr_conflicts 🔒

Validate per-parameter attribute conflicts.