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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<LineEnding> {
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<LineEnding> {
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<LineEnding> {
// 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;
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