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-rw-r--r--helix-core/src/indent.rs51
1 files changed, 32 insertions, 19 deletions
diff --git a/helix-core/src/indent.rs b/helix-core/src/indent.rs
index db780ed9..3aede6b0 100644
--- a/helix-core/src/indent.rs
+++ b/helix-core/src/indent.rs
@@ -19,6 +19,10 @@ pub enum IndentStyle {
Spaces(u8),
}
+// 16 spaces
+const INDENTS: &str = " ";
+const MAX_INDENT: u8 = 16;
+
impl IndentStyle {
/// Creates an `IndentStyle` from an indentation string.
///
@@ -27,10 +31,10 @@ impl IndentStyle {
#[inline]
pub fn from_str(indent: &str) -> Self {
// XXX: do we care about validating the input more than this? Probably not...?
- debug_assert!(!indent.is_empty() && indent.len() <= 8);
+ debug_assert!(!indent.is_empty() && indent.len() <= MAX_INDENT as usize);
if indent.starts_with(' ') {
- IndentStyle::Spaces(indent.len() as u8)
+ IndentStyle::Spaces(indent.len().clamp(1, MAX_INDENT as usize) as u8)
} else {
IndentStyle::Tabs
}
@@ -40,20 +44,13 @@ impl IndentStyle {
pub fn as_str(&self) -> &'static str {
match *self {
IndentStyle::Tabs => "\t",
- IndentStyle::Spaces(1) => " ",
- IndentStyle::Spaces(2) => " ",
- IndentStyle::Spaces(3) => " ",
- IndentStyle::Spaces(4) => " ",
- IndentStyle::Spaces(5) => " ",
- IndentStyle::Spaces(6) => " ",
- IndentStyle::Spaces(7) => " ",
- IndentStyle::Spaces(8) => " ",
-
- // Unsupported indentation style. This should never happen,
- // but just in case fall back to two spaces.
IndentStyle::Spaces(n) => {
- debug_assert!(n > 0 && n <= 8); // Always triggers. `debug_panic!()` wanted.
- " "
+ // Unsupported indentation style. This should never happen,
+ debug_assert!(n > 0 && n <= MAX_INDENT);
+
+ // Either way, clamp to the nearest supported value
+ let closest_n = n.clamp(1, MAX_INDENT) as usize;
+ &INDENTS[0..closest_n]
}
}
}
@@ -75,9 +72,9 @@ pub fn auto_detect_indent_style(document_text: &Rope) -> Option<IndentStyle> {
// Build a histogram of the indentation *increases* between
// subsequent lines, ignoring lines that are all whitespace.
//
- // Index 0 is for tabs, the rest are 1-8 spaces.
- let histogram: [usize; 9] = {
- let mut histogram = [0; 9];
+ // Index 0 is for tabs, the rest are 1-MAX_INDENT spaces.
+ let histogram: [usize; MAX_INDENT as usize + 1] = {
+ let mut histogram = [0; MAX_INDENT as usize + 1];
let mut prev_line_is_tabs = false;
let mut prev_line_leading_count = 0usize;
@@ -136,7 +133,7 @@ pub fn auto_detect_indent_style(document_text: &Rope) -> Option<IndentStyle> {
histogram[0] += 1;
} else {
let amount = leading_count - prev_line_leading_count;
- if amount <= 8 {
+ if amount <= MAX_INDENT as usize {
histogram[amount] += 1;
}
}
@@ -797,4 +794,20 @@ mod test {
3
);
}
+
+ #[test]
+ fn test_large_indent_level() {
+ let tab_width = 16;
+ let indent_width = 16;
+ let line = Rope::from(" fn new"); // 16 spaces
+ assert_eq!(
+ indent_level_for_line(line.slice(..), tab_width, indent_width),
+ 1
+ );
+ let line = Rope::from(" fn new"); // 32 spaces
+ assert_eq!(
+ indent_level_for_line(line.slice(..), tab_width, indent_width),
+ 2
+ );
+ }
}