literalext 0.1.1

A helper crate for interpreting proc-macro `Literal` values

literalext

Build Status

This crate provides extension methods to proc-macro, and proc-macro2's Literal types. These methods provide a mechanism for extracting the value of the type.

API

Adds a trait with implementations for the types proc_macro2::Literal, proc_macro::Literal, and DummyLiteral with the following methods for extracting the value of the type:

pub trait LiteralExt {
    /// If the `Literal` is an integer literal, returns its value.
    fn parse_int(&self) -> Option<IntLit>;

    /// If the `Literal` is a floating point literal, returns its value.
    fn parse_float(&self) -> Option<FloatLit>;

    /// If the `Literal` is a string literal, returns it's value.
    fn parse_string(&self) -> Option<String>;

    /// If the `Literal` is a char literal, returns it's value.
    fn parse_char(&self) -> Option<char>;

    /// If the `Literal` is a byte string literal, returns it's value.
    fn parse_bytes(&self) -> Option<Vec<u8>>;

    /// If the `Literal` is a byte literal, returns it's value.
    fn parse_byte(&self) -> Option<u8>;

    /// If the `Literal` is an inner doc comment (`//!` or `/*!`), returns a
    /// string with the text of the comment.
    fn parse_inner_doc(&self) -> Option<String>;

    /// If the `Literal` is an outer doc comment (`///` or `/**`), returns a
    /// string with the text of the comment.
    fn parse_outer_doc(&self) -> Option<String>;
}

Supported Features

  • i128: Add support for interpreting the i128 and u128 integer types. nightly only

  • proc-macro2 default: Implement LiteralExt on proc_macro2::Literal.

  • proc-macro: Implement LiteralExt on proc_macro::Literal. nightly only

  • dummy: Export a type DummyLiteral with a public constructor which implements the LiteralExt trait.