зеркало из
https://github.com/glebtv/tui-textarea.git
synced 2026-09-03 14:26:17 +03:00
refactor making display line text and tests for it
Этот коммит содержится в:
rhysd
164
src/highlight.rs
164
src/highlight.rs
@@ -17,6 +17,7 @@ use crate::tui::text::Spans;
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use crate::util::{num_digits, spaces};
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use std::borrow::Cow;
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use std::cmp::Ordering;
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use std::iter;
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enum Boundary {
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Cursor(Style),
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@@ -48,51 +49,40 @@ impl Boundary {
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}
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}
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fn prepare_line(s: &str, tab_len: u8, mask: Option<char>) -> Cow<'_, str> {
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// two tasks performed here
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// - mask out chars if mask is Some
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// - replace hard tabs by the correct number of spaces
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// (soft tabs were done earlier in 'insert_tab')
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match mask {
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Some(ch) => {
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// no tab processing in the mask case
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return Cow::Owned(s.chars().map(|_| ch).collect());
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}
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None => {
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let tab = spaces(tab_len);
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let mut buf = String::new();
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let mut col: usize = 0;
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for (i, c) in s.char_indices() {
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if buf.is_empty() {
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if c == '\t' {
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buf.reserve(s.len());
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buf.push_str(&s[..i]);
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if tab_len > 0 {
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let len = tab_len as usize - (col % tab_len as usize);
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buf.push_str(&tab[..len]);
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col += len;
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}
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} else {
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col += 1;
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}
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} else if c == '\t' {
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if tab_len > 0 {
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let len = tab_len as usize - (col % tab_len as usize);
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buf.push_str(&tab[..len]);
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col += len;
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}
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} else {
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buf.push(c);
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col += 1;
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}
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fn line_display_text(s: &str, tab_len: u8, mask: Option<char>) -> Cow<'_, str> {
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if let Some(ch) = mask {
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// No tab character processing in the mask case
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let masked = iter::repeat(ch).take(s.chars().count()).collect();
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return Cow::Owned(masked);
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}
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let tab = spaces(tab_len);
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let mut buf = String::new();
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let mut col = 0;
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for (i, c) in s.char_indices() {
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if c == '\t' {
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if buf.is_empty() {
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buf.reserve(s.len());
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buf.push_str(&s[..i]);
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}
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if tab_len > 0 {
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let len = tab_len as usize - (col % tab_len as usize);
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buf.push_str(&tab[..len]);
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col += len;
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}
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} else {
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if !buf.is_empty() {
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return Cow::Owned(buf);
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buf.push(c);
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}
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col += 1;
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}
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};
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// drop through in the case of no mask and no tabs
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return Cow::Borrowed(s);
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}
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if !buf.is_empty() {
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Cow::Owned(buf)
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} else {
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Cow::Borrowed(s)
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}
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}
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pub struct LineHighlighter<'a> {
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@@ -157,7 +147,10 @@ impl<'a> LineHighlighter<'a> {
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} = self;
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if boundaries.is_empty() {
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spans.push(Span::styled(prepare_line(line, tab_len, mask), style_begin));
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spans.push(Span::styled(
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line_display_text(line, tab_len, mask),
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style_begin,
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));
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if cursor_at_end {
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spans.push(Span::styled(" ", cursor_style));
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}
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@@ -178,7 +171,7 @@ impl<'a> LineHighlighter<'a> {
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if let Some((next_boundary, end)) = boundaries.next() {
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if start < end {
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spans.push(Span::styled(
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prepare_line(&line[start..end], tab_len, mask),
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line_display_text(&line[start..end], tab_len, mask),
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style,
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));
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}
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@@ -193,7 +186,7 @@ impl<'a> LineHighlighter<'a> {
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} else {
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if start != line.len() {
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spans.push(Span::styled(
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prepare_line(&line[start..], tab_len, mask),
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line_display_text(&line[start..], tab_len, mask),
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style,
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));
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}
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@@ -210,46 +203,47 @@ mod tests {
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use super::*;
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#[test]
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fn test_prepare_line() {
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// fn prepare_line(s: &str, tab_len: u8, mask: Option<char>) -> Cow<'_, str> {
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assert_eq!(prepare_line("", 0, None), Cow::Borrowed(""));
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assert_eq!(prepare_line("", 4, None), Cow::Borrowed(""));
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assert_eq!(prepare_line("", 8, None), Cow::Borrowed(""));
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assert_eq!(prepare_line("", 0, Some('x')), Cow::Borrowed(""));
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assert_eq!(prepare_line("", 4, Some('x')), Cow::Borrowed(""));
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assert_eq!(prepare_line("", 8, Some('x')), Cow::Borrowed(""));
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assert_eq!(prepare_line("a", 0, None), Cow::Borrowed("a"));
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assert_eq!(prepare_line("a", 4, None), Cow::Borrowed("a"));
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assert_eq!(prepare_line("a", 8, None), Cow::Borrowed("a"));
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assert_eq!(prepare_line("a", 0, Some('x')), Cow::Borrowed("x"));
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assert_eq!(prepare_line("a", 4, Some('x')), Cow::Borrowed("x"));
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assert_eq!(prepare_line("a", 8, Some('x')), Cow::Borrowed("x"));
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assert_eq!(prepare_line("a\t", 0, None), Cow::Borrowed("a"));
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assert_eq!(prepare_line("a\t", 4, None), Cow::Borrowed("a "));
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assert_eq!(prepare_line("a\t", 8, None), Cow::Borrowed("a "));
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assert_eq!(prepare_line("a\t", 0, Some('x')), Cow::Borrowed("xx"));
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assert_eq!(prepare_line("a\t", 4, Some('x')), Cow::Borrowed("xx"));
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assert_eq!(prepare_line("a\t", 8, Some('x')), Cow::Borrowed("xx"));
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assert_eq!(prepare_line("\t", 0, None), Cow::Borrowed("\t"));
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assert_eq!(prepare_line("\t", 4, None), Cow::Borrowed(" "));
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assert_eq!(prepare_line("\t", 8, None), Cow::Borrowed(" "));
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assert_eq!(prepare_line("\t", 0, Some('x')), Cow::Borrowed("x"));
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assert_eq!(prepare_line("\t", 4, Some('x')), Cow::Borrowed("x"));
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assert_eq!(prepare_line("\t", 8, Some('x')), Cow::Borrowed("x"));
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assert_eq!(prepare_line("a\tb", 0, None), Cow::Borrowed("ab"));
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assert_eq!(prepare_line("a\tb", 4, None), Cow::Borrowed("a b"));
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assert_eq!(prepare_line("a\tb", 8, None), Cow::Borrowed("a b"));
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assert_eq!(prepare_line("a\tb", 0, Some('x')), Cow::Borrowed("xxx"));
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assert_eq!(prepare_line("a\tb", 4, Some('x')), Cow::Borrowed("xxx"));
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assert_eq!(prepare_line("a\tb", 8, Some('x')), Cow::Borrowed("xxx"));
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assert_eq!(prepare_line("a\t\tb", 0, None), Cow::Borrowed("ab"));
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assert_eq!(prepare_line("a\t\tb", 4, None), Cow::Borrowed("a b"));
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assert_eq!(
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prepare_line("a\t\tb", 8, None),
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Cow::Borrowed("a b")
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);
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assert_eq!(prepare_line("a\t\tb", 0, Some('x')), Cow::Borrowed("xxxx"));
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assert_eq!(prepare_line("a\t\tb", 4, Some('x')), Cow::Borrowed("xxxx"));
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assert_eq!(prepare_line("a\t\tb", 8, Some('x')), Cow::Borrowed("xxxx"));
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#[rustfmt::skip]
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fn test_line_display_text() {
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assert_eq!(&line_display_text( "", 0, None), "");
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assert_eq!(&line_display_text( "", 4, None), "");
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assert_eq!(&line_display_text( "", 8, None), "");
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assert_eq!(&line_display_text( "", 0, Some('x')), "");
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assert_eq!(&line_display_text( "", 4, Some('x')), "");
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assert_eq!(&line_display_text( "", 8, Some('x')), "");
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assert_eq!(&line_display_text( "a", 0, None), "a");
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assert_eq!(&line_display_text( "a", 4, None), "a");
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assert_eq!(&line_display_text( "a", 8, None), "a");
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assert_eq!(&line_display_text( "a", 0, Some('x')), "x");
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assert_eq!(&line_display_text( "a", 4, Some('x')), "x");
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assert_eq!(&line_display_text( "a", 8, Some('x')), "x");
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assert_eq!(&line_display_text( "a\t", 0, None), "a");
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assert_eq!(&line_display_text( "a\t", 4, None), "a ");
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assert_eq!(&line_display_text( "a\t", 8, None), "a ");
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assert_eq!(&line_display_text( "a\t", 0, Some('x')), "xx");
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assert_eq!(&line_display_text( "a\t", 4, Some('x')), "xx");
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assert_eq!(&line_display_text( "a\t", 8, Some('x')), "xx");
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assert_eq!(&line_display_text( "\t", 0, None), "\t");
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assert_eq!(&line_display_text( "\t", 4, None), " ");
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assert_eq!(&line_display_text( "\t", 8, None), " ");
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assert_eq!(&line_display_text( "\t", 0, Some('x')), "x");
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assert_eq!(&line_display_text( "\t", 4, Some('x')), "x");
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assert_eq!(&line_display_text( "\t", 8, Some('x')), "x");
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assert_eq!(&line_display_text( "a\tb", 0, None), "ab");
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assert_eq!(&line_display_text( "a\tb", 4, None), "a b");
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assert_eq!(&line_display_text( "a\tb", 8, None), "a b");
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assert_eq!(&line_display_text( "a\tb", 0, Some('x')), "xxx");
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assert_eq!(&line_display_text( "a\tb", 4, Some('x')), "xxx");
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assert_eq!(&line_display_text( "a\tb", 8, Some('x')), "xxx");
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assert_eq!(&line_display_text("a\t\tb", 0, None), "ab");
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assert_eq!(&line_display_text("a\t\tb", 4, None), "a b");
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assert_eq!(&line_display_text("a\t\tb", 8, None), "a b");
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assert_eq!(&line_display_text("a\t\tb", 0, Some('x')), "xxxx");
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assert_eq!(&line_display_text("a\t\tb", 4, Some('x')), "xxxx");
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assert_eq!(&line_display_text("a\t\tb", 8, Some('x')), "xxxx");
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assert_eq!(&line_display_text("ab\t\t", 0, None), "ab");
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assert_eq!(&line_display_text("ab\t\t", 4, None), "ab ");
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assert_eq!(&line_display_text("ab\t\t", 8, None), "ab ");
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assert_eq!(&line_display_text("abcd\t", 4, None), "abcd ");
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}
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}
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