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Cosmetic changes and better comments for the indent auto-detect code.

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This commit is contained in:
Nathan Vegdahl 2021-06-13 20:11:40 -07:00
parent 4faf1d3bf4
commit ecb39da3e0
1 changed files with 22 additions and 15 deletions
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37
helix-view/src/document.rs
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@ -284,8 +284,11 @@ fn detect_indent_style(&mut self) {
// Index 0 is for tabs, the rest are 1-8 spaces.
let histogram: [usize; 9] = {
let mut histogram = [0; 9];
let mut prev_line_indent = (false, 0usize); // (was_tabs, count)
let mut prev_line_is_tabs = false;
let mut prev_line_leading_count = 0usize;
// Loop through the lines, checking for and recording indentation
// increases as we go.
'outer: for line in self.text.lines().take(1000) {
let mut c_iter = line.chars();
@ -295,21 +298,22 @@ fn detect_indent_style(&mut self) {
Some(' ') => false,
// Ignore blank lines.
Some(c) if char_is_linebreak(c) => continue 'outer,
Some(c) if char_is_linebreak(c) => continue,
_ => {
prev_line_indent = (false, 0usize);
continue 'outer;
prev_line_is_tabs = false;
prev_line_leading_count = 0;
continue;
}
};
// Count the total leading tab/space characters.
let mut count = 1;
// Count the line's total leading tab/space characters.
let mut leading_count = 1;
let mut count_is_done = false;
for c in c_iter {
match c {
'\t' if is_tabs && !count_is_done => count += 1,
' ' if !is_tabs && !count_is_done => count += 1,
'\t' if is_tabs && !count_is_done => leading_count += 1,
' ' if !is_tabs && !count_is_done => leading_count += 1,
// We stop counting if we hit whitespace that doesn't
// qualify as indent or doesn't match the leading
@ -324,27 +328,30 @@ fn detect_indent_style(&mut self) {
}
// Bound the worst-case execution time for weird text files.
if count > 256 {
if leading_count > 256 {
continue 'outer;
}
}
// Update stats.
if (prev_line_indent.0 == is_tabs || prev_line_indent.1 == 0)
&& prev_line_indent.1 < count
// If there was an increase in indentation over the previous
// line, update the histogram with that increase.
if (prev_line_is_tabs == is_tabs || prev_line_leading_count == 0)
&& prev_line_leading_count < leading_count
{
if is_tabs {
histogram[0] += 1;
} else {
let amount = count - prev_line_indent.1;
let amount = leading_count - prev_line_leading_count;
if amount <= 8 {
histogram[amount] += 1;
}
}
}
// Store data for use with the next line.
prev_line_indent = (is_tabs, count);
// Store this line's leading whitespace info for use with
// the next line.
prev_line_is_tabs = is_tabs;
prev_line_leading_count = leading_count;
}
// Give more weight to tabs, because their presence is a very