113 lines
3.1 KiB
Rust
113 lines
3.1 KiB
Rust
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use crate::text::misc_token::{unstructured, Unstructured};
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use crate::text::whitespace::{foldable_line, obs_crlf};
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use nom::{
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branch::alt,
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bytes::complete::{tag, tag_no_case, take_while1},
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character::complete::space0,
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combinator::{into, map},
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multi::{fold_many0, many0},
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sequence::{pair, terminated, tuple},
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IResult,
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};
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#[derive(Debug, PartialEq)]
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pub enum CompField<'a, T> {
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Known(T),
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Unknown(Kv<'a>),
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Bad(&'a [u8]),
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}
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#[derive(Debug, PartialEq, Clone)]
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pub struct Kv<'a>(pub &'a [u8], pub Unstructured<'a>);
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impl<'a> From<(&'a [u8], Unstructured<'a>)> for Kv<'a> {
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fn from(pair: (&'a [u8], Unstructured<'a>)) -> Self {
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Self(pair.0, pair.1)
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}
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}
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#[derive(Debug, PartialEq, Clone)]
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pub enum Field<'a> {
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Good(Kv<'a>),
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Bad(&'a [u8]),
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}
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impl<'a> From<Kv<'a>> for Field<'a> {
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fn from(kv: Kv<'a>) -> Self {
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Self::Good(kv)
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}
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}
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impl<'a> From<&'a [u8]> for Field<'a> {
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fn from(bad: &'a [u8]) -> Self {
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Self::Bad(bad)
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}
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}
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/// Parse headers as key/values
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pub fn header_kv(input: &[u8]) -> IResult<&[u8], Vec<Field>> {
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terminated(
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many0(
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alt((
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into(opt_field),
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into(foldable_line),
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))
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),
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obs_crlf
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)(input)
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}
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pub fn header<'a, T>(
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fx: impl Fn(&'a [u8]) -> IResult<&'a [u8], T> + Copy,
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) -> impl Fn(&'a [u8]) -> IResult<&'a [u8], (Vec::<T>, Vec::<Kv>, Vec<&'a [u8]>)> {
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move |input| {
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terminated(
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fold_many0(
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alt((
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map(fx, CompField::Known),
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map(opt_field, CompField::Unknown),
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map(foldable_line, CompField::Bad),
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)),
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|| (Vec::<T>::new(), Vec::<Kv>::new(), Vec::<&'a [u8]>::new()),
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|(mut known, mut unknown, mut bad), item| {
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match item {
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CompField::Known(v) => known.push(v),
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CompField::Unknown(v) => unknown.push(v),
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CompField::Bad(v) => bad.push(v),
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};
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(known, unknown, bad)
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}
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),
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obs_crlf,
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)(input)
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}
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}
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pub fn field_name<'a>(name: &'static [u8]) -> impl Fn(&'a [u8]) -> IResult<&'a [u8], &'a [u8]> {
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move |input| terminated(tag_no_case(name), tuple((space0, tag(b":"), space0)))(input)
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}
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pub fn field_any(input: &[u8]) -> IResult<&[u8], &[u8]> {
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terminated(
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take_while1(|c| (0x21..=0x7E).contains(&c) && c != 0x3A),
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tuple((space0, tag(b":"), space0)),
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)(input)
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}
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/// Optional field
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///
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/// ```abnf
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/// field = field-name ":" unstructured CRLF
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/// field-name = 1*ftext
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/// ftext = %d33-57 / ; Printable US-ASCII
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/// %d59-126 ; characters not including
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/// ; ":".
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/// ```
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pub fn opt_field(input: &[u8]) -> IResult<&[u8], Kv> {
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terminated(
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into(pair(
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field_any,
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unstructured,
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)),
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obs_crlf,
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)(input)
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}
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