use crate::{Rope, RopeGraphemes, RopeSlice}; /// Represents one of the valid Unicode line endings. /// VT, FF and PS are excluded here, as we don't expect them to show up as a default line break #[derive(PartialEq, Copy, Clone, Debug)] pub enum LineEnding { Crlf, // CarriageReturn followed by LineFeed LF, // U+000A -- LineFeed CR, // U+000D -- CarriageReturn Nel, // U+0085 -- NextLine LS, // U+2028 -- Line Separator } pub fn rope_slice_to_line_ending(g: &RopeSlice) -> Option { if let Some(text) = g.as_str() { str_to_line_ending(text) } else if g == "\u{000D}\u{000A}" { Some(LineEnding::Crlf) } else { // Not a line ending None } } pub fn str_to_line_ending(g: &str) -> Option { match g { "\u{000D}\u{000A}" => Some(LineEnding::Crlf), "\u{000A}" => Some(LineEnding::LF), "\u{000D}" => Some(LineEnding::CR), "\u{0085}" => Some(LineEnding::Nel), "\u{2028}" => Some(LineEnding::LS), // Not a line ending _ => None, } } pub fn auto_detect_line_ending(doc: &Rope) -> Option { // based on https://github.com/cessen/led/blob/27572c8838a1c664ee378a19358604063881cc1d/src/editor/mod.rs#L88-L162 let mut ending = None; for line in doc.lines().take(1) { // check first line only - unsure how sound this is ending = match line.len_chars() { 1 => { let g = RopeGraphemes::new(line.slice((line.len_chars() - 1)..)) .last() .unwrap(); rope_slice_to_line_ending(&g) } n if n > 1 => { let g = RopeGraphemes::new(line.slice((line.len_chars() - 2)..)) .last() .unwrap(); rope_slice_to_line_ending(&g) } _ => None, } } ending } #[cfg(target_os = "windows")] pub const DEFAULT_LINE_ENDING: LineEnding = LineEnding::Crlf; #[cfg(not(target_os = "windows"))] pub const DEFAULT_LINE_ENDING: LineEnding = LineEnding::Lf;