1. Topology is the group of layers that make up the characteristics of the ground we walk on in-game. This includes things such as: If the water is drinkable or seawater. If ore nodes can spawn. If it is the side of a road for junkpile spawns.
  2. The Rust map consists of several biomes; grassland, swamp, desert and snow. The largest occurring biome is the grasslands, there is one large desert area and one large snow area, as well as mountains across the map which turn into snow biomes as the altitude rises.
  1. Rust Root Combiner Red Light
  2. How To Use A Root Combiner Rust
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Rust Root Combiner Red Light

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A library that allows proc_macro function-like macros to be parsed usingthe combine parser combinator crate.

Motivation

When writing a #[proc_macro_derive] the input is Rust source code which iswell supported by the syn crate. However, when writing a #[proc_macro]macro, it is common to want to define a custom domain specific language.

This crate allows you to write a parser for your DSL using the combineparser combinator library. It also preserves the source span informationin the parsed result such that rustc can provide correct source locationsfor identifiers and literals that are re-used in the output.

Implementing a parser

This is a basic example using base combine parsers.

Using the parser! macro can help remove boilerplate.

Implementing a macro

A proc macro must be defined at the crate root within the lib.rs file.

Re-exports

pub use diagnostic::Incomplete;
pub use input::Input;
pub use input::Token;

Modules

diagnostic

Utilities to generate diagnostic error messages.

input

Wrappers and transforms to around proc_macro types to implement combine traits.

parser

A collection of parsers for Tokens (similar to combine::parser::{char, byte, item}).

Macros

Root Combiner Rust
parser

A macro to remove the generics boilerplate when defining parsers.

Structs

How To Use A Root Combiner Rust

Ident

A word of Rust code, which may be a keyword or legal variable name.

Literal

A literal string ('hello'), byte string (b'hello'), character ('a'),byte character (b'a'), an integer or floating point number with or withouta suffix (1, 1u8, 2.3, 2.3f32).

Punct

An Punct is an single punctuation character like +, - or #.

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