Parze

Parze is a clean, efficient parser combinator written in Rust.

Example

A parser capable of parsing all valid Brainfuck code into an AST.

```rust use parze::prelude::*;

[derive(Clone, Debug, PartialEq)]

enum Instr { Add, Sub, Left, Right, In, Out, Loop(Vec) }

parsers! { bf = { ( '+' -> { Instr::Add } | '-' -> { Instr::Sub } | '<' -> { Instr::Left } | '>' -> { Instr::Right } | ',' -> { Instr::In } | '.' -> { Instr::Out } | '[' -& bf &- ']' => |ts| { Instr::Loop(ts) } ) * } } ```

Features

• [x] All the usual parser combinator operations
• [x] Macro for simple rule and parser declaration
• [x] Support for recursive parser definitions
• [x] Custom error types - define your own!
• [x] Prioritised / merged failure for more useful errors
• [x] No dependencies - fast compilation!
• [x] no_std support

Why Parze?

Parze is largely a personal project. There is currently little reason to use it over a well-established existing parser combinator like pom.

Explicit Form

While Parze encourage use of macros for much of its declarative notation, it is possible (and often useful) to make use of the more explicit rust-y notation.

Here is the Brainfuck parser given above, declared in explicit form.

rust let bf: Parser<_, _> = recursive(|bf| ( sym('+').to(Instr::Add) .or(sym('-').to(Instr::Sub)) .or(sym('<').to(Instr::Left)) .or(sym('>').to(Instr::Right)) .or(sym(',').to(Instr::In)) .or(sym('.').to(Instr::Out)) .or(sym('[').delimiter_for(bf).delimited_by(sym(']')).map(|ts| Instr::Loop(ts))) ).repeat(..));

License

Parze is distributed under either of:

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)

• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at the disgression of the user.