127 lines
2.9 KiB
Rust
127 lines
2.9 KiB
Rust
use std::borrow::Cow;
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use nom::{
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bytes::complete::{tag, take_while1},
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character::complete::space0,
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error::ParseError,
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sequence::delimited,
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IResult,
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};
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use crate::parsers::{blank_lines, eol, line, take_lines_while};
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/// Drawer Element
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#[derive(Debug, Default)]
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#[cfg_attr(test, derive(PartialEq))]
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#[cfg_attr(feature = "ser", derive(serde::Serialize))]
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pub struct Drawer<'a> {
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/// Drawer name
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pub name: Cow<'a, str>,
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/// Numbers of blank lines between first drawer's line and next non-blank
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/// line
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pub pre_blank: usize,
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/// Numbers of blank lines between last drawer's line and next non-blank
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/// line or buffer's end
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pub post_blank: usize,
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}
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impl Drawer<'_> {
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pub(crate) fn parse(input: &str) -> Option<(&str, (Drawer, &str))> {
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parse_drawer::<()>(input).ok()
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}
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pub fn into_owned(self) -> Drawer<'static> {
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Drawer {
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name: self.name.into_owned().into(),
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pre_blank: self.pre_blank,
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post_blank: self.post_blank,
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}
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}
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}
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#[inline]
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pub fn parse_drawer<'a, E: ParseError<&'a str>>(
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input: &'a str,
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) -> IResult<&str, (Drawer, &str), E> {
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let (input, (mut drawer, content)) = parse_drawer_without_blank(input)?;
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let (content, blank) = blank_lines(content);
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drawer.pre_blank = blank;
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let (input, blank) = blank_lines(input);
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drawer.post_blank = blank;
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Ok((input, (drawer, content)))
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}
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pub fn parse_drawer_without_blank<'a, E: ParseError<&'a str>>(
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input: &'a str,
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) -> IResult<&str, (Drawer, &str), E> {
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let (input, _) = space0(input)?;
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let (input, name) = delimited(
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tag(":"),
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take_while1(|c: char| c.is_ascii_alphabetic() || c == '-' || c == '_'),
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tag(":"),
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)(input)?;
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let (input, _) = eol(input)?;
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let (input, contents) =
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take_lines_while(|line| !line.trim().eq_ignore_ascii_case(":END:"))(input);
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let (input, _) = line(input)?;
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Ok((
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input,
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(
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Drawer {
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name: name.into(),
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pre_blank: 0,
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post_blank: 0,
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},
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contents,
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),
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))
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}
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#[test]
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fn parse() {
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use nom::error::VerboseError;
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assert_eq!(
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parse_drawer::<VerboseError<&str>>(
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r#":PROPERTIES:
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:CUSTOM_ID: id
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:END:"#
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),
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Ok((
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"",
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(
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Drawer {
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name: "PROPERTIES".into(),
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pre_blank: 0,
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post_blank: 0
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},
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" :CUSTOM_ID: id\n"
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)
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))
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);
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assert_eq!(
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parse_drawer::<VerboseError<&str>>(
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r#":PROPERTIES:
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:END:
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"#
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),
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Ok((
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"",
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(
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Drawer {
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name: "PROPERTIES".into(),
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pre_blank: 2,
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post_blank: 1,
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},
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""
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)
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))
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);
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}
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