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Allow any indent size from 1 to 16 (#7429)
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2c5288dafb
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@ -19,6 +19,10 @@ pub enum IndentStyle {
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Spaces(u8),
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}
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// 16 spaces
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const INDENTS: &str = " ";
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const MAX_INDENT: u8 = 16;
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impl IndentStyle {
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/// Creates an `IndentStyle` from an indentation string.
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///
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@ -27,10 +31,10 @@ impl IndentStyle {
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#[inline]
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pub fn from_str(indent: &str) -> Self {
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// XXX: do we care about validating the input more than this? Probably not...?
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debug_assert!(!indent.is_empty() && indent.len() <= 8);
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debug_assert!(!indent.is_empty() && indent.len() <= MAX_INDENT as usize);
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if indent.starts_with(' ') {
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IndentStyle::Spaces(indent.len() as u8)
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IndentStyle::Spaces(indent.len().clamp(1, MAX_INDENT as usize) as u8)
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} else {
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IndentStyle::Tabs
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}
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@ -40,20 +44,13 @@ pub fn from_str(indent: &str) -> Self {
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pub fn as_str(&self) -> &'static str {
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match *self {
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IndentStyle::Tabs => "\t",
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IndentStyle::Spaces(1) => " ",
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IndentStyle::Spaces(2) => " ",
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IndentStyle::Spaces(3) => " ",
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IndentStyle::Spaces(4) => " ",
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IndentStyle::Spaces(5) => " ",
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IndentStyle::Spaces(6) => " ",
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IndentStyle::Spaces(7) => " ",
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IndentStyle::Spaces(8) => " ",
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// Unsupported indentation style. This should never happen,
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// but just in case fall back to two spaces.
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IndentStyle::Spaces(n) => {
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debug_assert!(n > 0 && n <= 8); // Always triggers. `debug_panic!()` wanted.
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" "
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// Unsupported indentation style. This should never happen,
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debug_assert!(n > 0 && n <= MAX_INDENT);
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// Either way, clamp to the nearest supported value
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let closest_n = n.clamp(1, MAX_INDENT) as usize;
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&INDENTS[0..closest_n]
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}
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}
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}
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@ -75,9 +72,9 @@ pub fn auto_detect_indent_style(document_text: &Rope) -> Option<IndentStyle> {
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// Build a histogram of the indentation *increases* between
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// subsequent lines, ignoring lines that are all whitespace.
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//
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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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// Index 0 is for tabs, the rest are 1-MAX_INDENT spaces.
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let histogram: [usize; MAX_INDENT as usize + 1] = {
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let mut histogram = [0; MAX_INDENT as usize + 1];
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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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@ -136,7 +133,7 @@ pub fn auto_detect_indent_style(document_text: &Rope) -> Option<IndentStyle> {
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histogram[0] += 1;
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} else {
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let amount = leading_count - prev_line_leading_count;
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if amount <= 8 {
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if amount <= MAX_INDENT as usize {
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histogram[amount] += 1;
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}
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}
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@ -797,4 +794,20 @@ fn test_indent_level() {
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3
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);
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}
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#[test]
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fn test_large_indent_level() {
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let tab_width = 16;
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let indent_width = 16;
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let line = Rope::from(" fn new"); // 16 spaces
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assert_eq!(
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indent_level_for_line(line.slice(..), tab_width, indent_width),
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1
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);
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let line = Rope::from(" fn new"); // 32 spaces
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assert_eq!(
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indent_level_for_line(line.slice(..), tab_width, indent_width),
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2
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);
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}
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}
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