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a/README.md b/README.md new file mode 100644 index 0000000..cbf7ea4 --- /dev/null +++ b/README.md @@ -0,0 +1,19 @@ +# abnf-rfc5234 + +Rust library for working with Augmented BNF (ABNF) Syntax Specifications +in accordance with RFC 5234 (). + +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 :^) \ No newline at end of file diff --git a/src/core/alpha.pest b/src/core/alpha.pest new file mode 100644 index 0000000..4f0e99c --- /dev/null +++ b/src/core/alpha.pest @@ -0,0 +1,17 @@ +//! Parser for RFC5234 Core Rule "ALPHA" +//! +//! ```text +//! ALPHA = %x41-5A / %x61-7A ; A-Z / a-z +//! ``` +//! +//! +//! +//! We use the builtin `ASCII_ALPHA` from Pest: +//! +//! | Built-in rule | Equivalent | +//! |---------------|-----------------------| +//! | `ASCII_ALPHA` | `'a'..'z' | 'A'..'Z'` | +//! +//! + +alpha = { ASCII_ALPHA } \ No newline at end of file diff --git a/src/core/mod.rs b/src/core/mod.rs new file mode 100644 index 0000000..6bccaca --- /dev/null +++ b/src/core/mod.rs @@ -0,0 +1,60 @@ +//! 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. +//! +//! + +/// RFC5234 Core Rules +/// +/// +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)); + } + } +} \ No newline at end of file diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..689cad3 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1 @@ +pub mod core; \ No newline at end of file