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