89 lines
2.1 KiB
Rust
89 lines
2.1 KiB
Rust
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use nom::{
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IResult,
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bytes::complete::{tag, take_while1},
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combinator::{recognize, opt},
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multi::many0,
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sequence::{delimited, pair},
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};
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use crate::whitespace::cfws;
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/// VCHAR definition
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pub fn is_vchar(c: char) -> bool {
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(c >= '\x21' && c <= '\x7E') || !c.is_ascii()
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}
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/// Sequence of visible chars with the UTF-8 extension
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///
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/// ```abnf
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/// VCHAR = %x21-7E
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/// ; visible (printing) characters
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/// VCHAR =/ UTF8-non-ascii
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/// SEQ = 1*VCHAR
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///```
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pub fn vchar_seq(input: &str) -> IResult<&str, &str> {
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take_while1(is_vchar)(input)
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}
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/// Atom allowed characters
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fn is_atext(c: char) -> bool {
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c.is_ascii_alphanumeric() || "!#$%&'*+-/=?^_`{|}~".contains(c)
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}
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/// Atom
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///
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/// `[CFWS] 1*atext [CFWS]`
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pub fn atom(input: &str) -> IResult<&str, &str> {
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delimited(opt(cfws), take_while1(is_atext), opt(cfws))(input)
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}
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/// dot-atom-text
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///
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/// `1*atext *("." 1*atext)`
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fn dot_atom_text(input: &str) -> IResult<&str, &str> {
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recognize(pair(take_while1(is_atext), many0(pair(tag("."), take_while1(is_atext)))))(input)
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}
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/// dot-atom
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///
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/// `[CFWS] dot-atom-text [CFWS]`
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fn dot_atom(input: &str) -> IResult<&str, &str> {
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delimited(opt(cfws), dot_atom_text, opt(cfws))(input)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_vchar_seq() {
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assert_eq!(vchar_seq("hello world"), Ok((" world", "hello")));
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assert_eq!(vchar_seq("hello👋 world"), Ok((" world", "hello👋")));
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}
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#[test]
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fn test_atext() {
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assert!(is_atext('='));
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assert!(is_atext('5'));
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assert!(is_atext('Q'));
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assert!(!is_atext(' '));
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assert!(!is_atext('É'));
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}
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#[test]
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fn test_atom() {
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assert_eq!(atom("(skip) imf_codec (hidden) aerogramme"), Ok(("aerogramme", "imf_codec")));
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}
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#[test]
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fn test_dot_atom_text() {
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assert_eq!(dot_atom_text("quentin.dufour.io abcdef"), Ok((" abcdef", "quentin.dufour.io")));
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}
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#[test]
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fn test_dot_atom() {
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assert_eq!(dot_atom(" (skip) quentin.dufour.io abcdef"), Ok(("abcdef", "quentin.dufour.io")));
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}
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}
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