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109 lines
3.3 KiB
Rust
109 lines
3.3 KiB
Rust
use crate::{find_first_non_whitespace_char2, Change, RopeSlice, State, Tendril, Transaction};
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use core::ops::Range;
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use std::borrow::Cow;
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fn find_line_comment(
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token: &str,
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text: RopeSlice,
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lines: Range<usize>,
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) -> (bool, Vec<usize>, usize) {
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let mut commented = true;
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let mut skipped = Vec::new();
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let mut min = usize::MAX; // minimum col for find_first_non_whitespace_char
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for line in lines {
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let line_slice = text.line(line);
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if let Some(pos) = find_first_non_whitespace_char2(line_slice) {
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let len = line_slice.len_chars();
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if pos < min {
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min = pos;
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}
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// line can be shorter than pos + token len
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let fragment = Cow::from(line_slice.slice(pos..std::cmp::min(pos + token.len(), len)));
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if fragment != token {
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// as soon as one of the non-blank lines doesn't have a comment, the whole block is
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// considered uncommented.
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commented = false;
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}
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} else {
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// blank line
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skipped.push(line);
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}
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}
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(commented, skipped, min)
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}
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pub fn toggle_line_comments(state: &State) -> Transaction {
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let text = state.doc.slice(..);
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let mut changes: Vec<Change> = Vec::new();
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let token = "//";
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let comment = Tendril::from(format!("{} ", token));
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for selection in state.selection.ranges() {
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let start = text.char_to_line(selection.from());
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let end = text.char_to_line(selection.to());
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let lines = start..end + 1;
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let (commented, skipped, min) = find_line_comment(token, text, lines.clone());
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changes.reserve(end - start - skipped.len());
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for line in lines {
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if skipped.contains(&line) {
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continue;
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}
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let pos = text.line_to_char(line) + min;
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if !commented {
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// comment line
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changes.push((pos, pos, Some(comment.clone())))
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} else {
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// uncomment line
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let margin = 1; // TODO: margin is hardcoded 1 but could easily be 0
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changes.push((pos, pos + token.len() + margin, None))
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}
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}
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}
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Transaction::change(state, changes.into_iter())
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_find_line_comment() {
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use crate::{Rope, Selection};
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// four lines, two space indented, except for line 1 which is blank.
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let doc = Rope::from(" 1\n\n 2\n 3");
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let mut state = State::new(doc);
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// select whole document
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state.selection = Selection::single(0, state.doc.len_chars() - 1);
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let text = state.doc.slice(..);
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let res = find_line_comment("//", text, 0..3);
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// (commented = true, skipped = [line 1], min = col 2)
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assert_eq!(res, (false, vec![1], 2));
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// comment
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let transaction = toggle_line_comments(&state);
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transaction.apply(&mut state);
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assert_eq!(state.doc, " // 1\n\n // 2\n // 3");
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// uncomment
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let transaction = toggle_line_comments(&state);
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transaction.apply(&mut state);
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assert_eq!(state.doc, " 1\n\n 2\n 3");
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// TODO: account for no margin after comment
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// TODO: account for uncommenting with uneven comment indentation
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}
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}
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