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@ -9,6 +9,24 @@ use crate::{
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use helix_stdx::rope::RopeSliceExt;
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use std::borrow::Cow;
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pub const DEFAULT_COMMENT_TOKEN: &str = "//";
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/// Returns the longest matching comment token of the given line (if it exists).
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pub fn get_comment_token<'a, S: AsRef<str>>(
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text: RopeSlice,
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tokens: &'a [S],
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line_num: usize,
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) -> Option<&'a str> {
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let line = text.line(line_num);
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let start = line.first_non_whitespace_char()?;
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tokens
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.iter()
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.map(AsRef::as_ref)
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.filter(|token| line.slice(start..).starts_with(token))
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.max_by_key(|token| token.len())
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}
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/// Given text, a comment token, and a set of line indices, returns the following:
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/// - Whether the given lines should be considered commented
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/// - If any of the lines are uncommented, all lines are considered as such.
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@ -28,21 +46,20 @@ fn find_line_comment(
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let mut min = usize::MAX; // minimum col for first_non_whitespace_char
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let mut margin = 1;
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let token_len = token.chars().count();
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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) = line_slice.first_non_whitespace_char() {
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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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min = std::cmp::min(min, pos);
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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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// 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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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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@ -56,6 +73,7 @@ fn find_line_comment(
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to_change.push(line);
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}
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}
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(commented, to_change, min, margin)
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}
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@ -63,7 +81,7 @@ fn find_line_comment(
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pub fn toggle_line_comments(doc: &Rope, selection: &Selection, token: Option<&str>) -> Transaction {
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let text = doc.slice(..);
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let token = token.unwrap_or("//");
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let token = token.unwrap_or(DEFAULT_COMMENT_TOKEN);
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let comment = Tendril::from(format!("{} ", token));
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let mut lines: Vec<usize> = Vec::with_capacity(selection.len());
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@ -317,56 +335,87 @@ pub fn split_lines_of_selection(text: RopeSlice, selection: &Selection) -> Selec
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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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// four lines, two space indented, except for line 1 which is blank.
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let mut doc = Rope::from(" 1\n\n 2\n 3");
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// select whole document
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let mut selection = Selection::single(0, doc.len_chars() - 1);
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mod find_line_comment {
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use super::*;
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let text = doc.slice(..);
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#[test]
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fn not_commented() {
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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 res = find_line_comment("//", text, 0..3);
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// (commented = true, to_change = [line 0, line 2], min = col 2, margin = 0)
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assert_eq!(res, (false, vec![0, 2], 2, 0));
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let text = doc.slice(..);
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// comment
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let transaction = toggle_line_comments(&doc, &selection, None);
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transaction.apply(&mut doc);
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selection = selection.map(transaction.changes());
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let res = find_line_comment("//", text, 0..3);
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// (commented = false, to_change = [line 0, line 2], min = col 2, margin = 0)
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assert_eq!(res, (false, vec![0, 2], 2, 0));
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}
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assert_eq!(doc, " // 1\n\n // 2\n // 3");
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#[test]
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fn is_commented() {
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// three lines where the second line is empty.
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let doc = Rope::from("// hello\n\n// there");
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// uncomment
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let transaction = toggle_line_comments(&doc, &selection, None);
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transaction.apply(&mut doc);
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selection = selection.map(transaction.changes());
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assert_eq!(doc, " 1\n\n 2\n 3");
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assert!(selection.len() == 1); // to ignore the selection unused warning
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let res = find_line_comment("//", doc.slice(..), 0..3);
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// 0 margin comments
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doc = Rope::from(" //1\n\n //2\n //3");
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// reset the selection.
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selection = Selection::single(0, doc.len_chars() - 1);
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// (commented = true, to_change = [line 0, line 2], min = col 0, margin = 1)
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assert_eq!(res, (true, vec![0, 2], 0, 1));
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}
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}
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let transaction = toggle_line_comments(&doc, &selection, None);
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transaction.apply(&mut doc);
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selection = selection.map(transaction.changes());
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assert_eq!(doc, " 1\n\n 2\n 3");
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assert!(selection.len() == 1); // to ignore the selection unused warning
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// TODO: account for uncommenting with uneven comment indentation
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mod toggle_line_comment {
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use super::*;
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// 0 margin comments, with no space
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doc = Rope::from("//");
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// reset the selection.
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selection = Selection::single(0, doc.len_chars() - 1);
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#[test]
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fn comment() {
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// four lines, two space indented, except for line 1 which is blank.
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let mut doc = Rope::from(" 1\n\n 2\n 3");
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// select whole document
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let selection = Selection::single(0, doc.len_chars() - 1);
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let transaction = toggle_line_comments(&doc, &selection, None);
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transaction.apply(&mut doc);
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selection = selection.map(transaction.changes());
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assert_eq!(doc, "");
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assert!(selection.len() == 1); // to ignore the selection unused warning
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let transaction = toggle_line_comments(&doc, &selection, None);
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transaction.apply(&mut doc);
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assert_eq!(doc, " // 1\n\n // 2\n // 3");
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}
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// TODO: account for uncommenting with uneven comment indentation
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#[test]
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fn uncomment() {
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let mut doc = Rope::from(" // 1\n\n // 2\n // 3");
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let mut selection = Selection::single(0, doc.len_chars() - 1);
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let transaction = toggle_line_comments(&doc, &selection, None);
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transaction.apply(&mut doc);
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selection = selection.map(transaction.changes());
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assert_eq!(doc, " 1\n\n 2\n 3");
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assert!(selection.len() == 1); // to ignore the selection unused warning
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}
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#[test]
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fn uncomment_0_margin_comments() {
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let mut doc = Rope::from(" //1\n\n //2\n //3");
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let mut selection = Selection::single(0, doc.len_chars() - 1);
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let transaction = toggle_line_comments(&doc, &selection, None);
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transaction.apply(&mut doc);
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selection = selection.map(transaction.changes());
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assert_eq!(doc, " 1\n\n 2\n 3");
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assert!(selection.len() == 1); // to ignore the selection unused warning
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}
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#[test]
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fn uncomment_0_margin_comments_with_no_space() {
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let mut doc = Rope::from("//");
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let mut selection = Selection::single(0, doc.len_chars() - 1);
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let transaction = toggle_line_comments(&doc, &selection, None);
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transaction.apply(&mut doc);
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selection = selection.map(transaction.changes());
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assert_eq!(doc, "");
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assert!(selection.len() == 1); // to ignore the selection unused warning
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}
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}
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#[test]
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@ -413,4 +462,32 @@ mod test {
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transaction.apply(&mut doc);
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assert_eq!(doc, "");
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}
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/// Test, if `get_comment_tokens` works, even if the content of the file includes chars, whose
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/// byte size unequal the amount of chars
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#[test]
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fn test_get_comment_with_char_boundaries() {
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let rope = Rope::from("··");
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let tokens = ["//", "///"];
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assert_eq!(
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super::get_comment_token(rope.slice(..), tokens.as_slice(), 0),
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None
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);
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}
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/// Test for `get_comment_token`.
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///
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/// Assuming the comment tokens are stored as `["///", "//"]`, `get_comment_token` should still
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/// return `///` instead of `//` if the user is in a doc-comment section.
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#[test]
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fn test_use_longest_comment() {
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let text = Rope::from(" /// amogus");
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let tokens = ["///", "//"];
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assert_eq!(
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super::get_comment_token(text.slice(..), tokens.as_slice(), 0),
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Some("///")
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);
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}
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}
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Cedric Meukens
2 weeks ago
committed by
GitHub