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feat: helpers in textchange to convert to rowcol

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əlemi 2023-09-04 03:10:33 +02:00
parent 690a1915c9
commit 81bbef6072
1 changed files with 24 additions and 0 deletions
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24
src/buffer/mod.rs
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@ -19,6 +19,8 @@ pub mod factory;
pub use factory::OperationFactory; pub use factory::OperationFactory;
pub use controller::BufferController as Controller; pub use controller::BufferController as Controller;
use crate::proto::RowCol;
/// an editor-friendly representation of a text change in a buffer /// an editor-friendly representation of a text change in a buffer
/// ///
@ -34,4 +36,26 @@ pub struct TextChange {
/// reference to current content of buffer /// reference to current content of buffer
pub after: Arc<String>, pub after: Arc<String>,
} }
impl TextChange {
/// convert from byte index to row and column.
/// if `end` is true, span end will be used, otherwise span start
/// if `after` is true, buffer after change will be used, otherwise buffer before change
fn index_to_rowcol(&self, end: bool, after: bool) -> RowCol {
let txt = if after { &self.after } else { &self.before };
let index = if end { self.span.end } else { self.span.start };
let row = txt[..index].matches('\n').count() as i32;
let col = txt[..index].split('\n').last().unwrap_or("").len() as i32;
RowCol { row, col }
}
/// retrn row and column of text change start
pub fn start(&self) -> RowCol {
self.index_to_rowcol(false, false)
}
/// return row and column of text change end
pub fn end(&self) -> RowCol {
self.index_to_rowcol(true, false)
}
} }