43 lines
1.6 KiB
Rust
43 lines
1.6 KiB
Rust
use nom::bytes::complete::tag;
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use nom::character::complete::line_ending;
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use nom::character::complete::one_of;
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use nom::combinator::recognize;
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use nom::multi::many0;
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use super::Context;
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use crate::error::CustomError;
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use crate::error::MyError;
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use crate::error::Res;
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use crate::parser::util::get_consumed;
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use crate::parser::util::get_one_before;
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use crate::parser::LineBreak;
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#[tracing::instrument(ret, level = "debug")]
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pub fn line_break<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, LineBreak<'s>> {
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let (remaining, _) = pre(context, input)?;
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let (remaining, _) = tag(r#"\\"#)(remaining)?;
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let (remaining, _) = recognize(many0(one_of(" \t")))(remaining)?;
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let (remaining, _) = line_ending(remaining)?;
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let source = get_consumed(input, remaining);
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Ok((remaining, LineBreak { source }))
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}
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#[tracing::instrument(ret, level = "debug")]
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fn pre<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, ()> {
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let document_root = context.get_document_root().unwrap();
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let preceding_character = get_one_before(document_root, input)
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.map(|slice| slice.chars().next())
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.flatten();
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// TODO: Must be at the end of a non-empty line so instead of getting one character before, we need to grab the entire line.
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match preceding_character {
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// If None, we are at the start of the file
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None | Some('\\') => {
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return Err(nom::Err::Error(CustomError::MyError(MyError(
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"Not a valid pre character for line break.",
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))));
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}
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_ => {}
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};
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Ok((input, ()))
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}
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