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Original file line number | Diff line number | Diff line change |
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use crate::{Rope, RopeGraphemes, RopeSlice}; | ||
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/// Represents one of the valid Unicode line endings. | ||
#[derive(PartialEq, Copy, Clone, Debug)] | ||
pub enum LineEnding { | ||
Crlf, // CarriageReturn followed by LineFeed | ||
LF, // U+000A -- LineFeed | ||
VT, // U+000B -- VerticalTab | ||
FF, // U+000C -- FormFeed | ||
CR, // U+000D -- CarriageReturn | ||
Nel, // U+0085 -- NextLine | ||
LS, // U+2028 -- Line Separator | ||
PS, // U+2029 -- ParagraphSeparator | ||
} | ||
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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 | ||
} | ||
} | ||
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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{000B}" => Some(LineEnding::VT), | ||
"\u{000C}" => Some(LineEnding::FF), | ||
"\u{000D}" => Some(LineEnding::CR), | ||
"\u{0085}" => Some(LineEnding::Nel), | ||
"\u{2028}" => Some(LineEnding::LS), | ||
"\u{2029}" => Some(LineEnding::PS), | ||
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// Not a line ending | ||
_ => None, | ||
} | ||
} | ||
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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 | ||
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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 | ||
} | ||
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pub fn default_line_ending() -> Option<LineEnding> { | ||
if cfg!(windows) { | ||
Some(LineEnding::Crlf) | ||
} else { | ||
Some(LineEnding::LF) | ||
} | ||
} |
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