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Erik N 2024-11-19 22:30:40 +01:00
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[package]
name = "abnf-rfc5234"
description = "Augumented Backus-Naur Form (ABNF) in accordance with RFC 5234"
license = "ISC"
readme = "README.md"
repository = "https://git.nstr.no/nstr-sw/abnf-rfc5234"
authors = ["Nstr Software AS"]
keywords = ["rfc5234", "abnf", "bnf", "backus-naur"]
version = "0.1.0-dev.0"
edition = "2021"
[dependencies]
pest = { version = "2", features = ["miette-error", "pretty-print"] }
pest_derive = { version = "2", features = ["grammar-extras"] }
thiserror = "2"

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README.md Normal file
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# abnf-rfc5234
Rust library for working with Augmented BNF (ABNF) Syntax Specifications
in accordance with RFC 5234 (<https://www.rfc-editor.org/rfc/rfc5234.html>).
Parsing is performed using crates [pest](https://pest.rs/) and
[pest_derive](https://crates.io/crates/pest_derive).
This library is targeted at crates that wish to implement parsing
relating to syntax defined in other RFCs.
It is expected that application crates will NOT use `abnf-rfc5234` directly,
but that they might pull it in as an indirect dependency if they use other
library crates that make use of this library crate for parsing of syntax
defined in other RFCs.
## Notable library crates that use this library crate
None yet :^)

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//! Parser for RFC5234 Core Rule "ALPHA"
//!
//! ```text
//! ALPHA = %x41-5A / %x61-7A ; A-Z / a-z
//! ```
//!
//! <https://www.rfc-editor.org/rfc/rfc5234.html#appendix-B.1>
//!
//! We use the builtin `ASCII_ALPHA` from Pest:
//!
//! | Built-in rule | Equivalent |
//! |---------------|-----------------------|
//! | `ASCII_ALPHA` | `'a'..'z' | 'A'..'Z'` |
//!
//! <https://pest.rs/book/grammars/built-ins.html#ascii-rules>
alpha = { ASCII_ALPHA }

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//! Core ABNF
//!
//! > Basic rules that are in common use. [...] Note that these rules are only valid
//! > for ABNF encoded in 7-bit ASCII or in characters sets that are a
//! > superset of 7-bit ASCII.
//!
//! <https://www.rfc-editor.org/rfc/rfc5234.html#appendix-B>
/// RFC5234 Core Rules
///
/// <https://www.rfc-editor.org/rfc/rfc5234.html#appendix-B.1>
pub mod rules {
use pest_derive::Parser;
use pest::Parser;
/// Tests for Core Rule "ALPHA".
///
/// `ALPHA = %x41-5A / %x61-7A ; A-Z / a-z`
pub mod alpha {
use super::Parser;
#[derive(Parser)]
#[grammar = "core/alpha.pest"]
pub struct ParserSingleAlpha;
/// Tests that ALPHA example value `0x41` ("A") is successfully parsed
#[test]
fn positive_single_alpha_0x41() {
let mut pairs = ParserSingleAlpha::parse(Rule::alpha, "A").expect("alpha 'A'");
let pair = pairs.next().expect("parsed pairs has a pair");
assert_eq!(Rule::alpha, pair.as_rule());
assert_eq!("A", pair.as_str());
assert!(pairs.next().is_none());
}
/// Tests that non-ALPHA example value `0x40` ("@") is rejected
#[test]
fn negative_single_non_alpha_0x40() {
let e = ParserSingleAlpha::parse(Rule::alpha, "@").expect_err("non-alpha '@'");
assert_eq!(e.location, pest::error::InputLocation::Pos(0));
}
/// Tests that ALPHA example value `0x7a` ("z") is successfully parsed
#[test]
fn positive_single_alpha_0x7a() {
let mut pairs = ParserSingleAlpha::parse(Rule::alpha, "z").expect("alpha 'z'");
let pair = pairs.next().expect("parsed pairs has a pair");
assert_eq!(Rule::alpha, pair.as_rule());
assert_eq!(&[0x7a], pair.as_str().as_bytes());
assert!(pairs.next().is_none());
}
/// Tests that non-ALPHA example value `0x7b` ("{") is rejected
#[test]
fn negative_single_non_alpha_0x7b() {
let e = ParserSingleAlpha::parse(Rule::alpha, "{").expect_err("non-alpha '{'");
assert_eq!(e.location, pest::error::InputLocation::Pos(0));
}
}
}

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pub mod core;