diff options
| -rw-r--r-- | helix-core/src/match_brackets.rs | 95 | ||||
| -rw-r--r-- | helix-term/src/commands.rs | 4 | ||||
| -rw-r--r-- | helix-term/src/ui/editor.rs | 2 |
3 files changed, 70 insertions, 31 deletions
diff --git a/helix-core/src/match_brackets.rs b/helix-core/src/match_brackets.rs index 136ce320..cd554005 100644 --- a/helix-core/src/match_brackets.rs +++ b/helix-core/src/match_brackets.rs @@ -1,3 +1,5 @@ +use tree_sitter::Node; + use crate::{Rope, Syntax}; const PAIRS: &[(char, char)] = &[ @@ -6,50 +8,85 @@ const PAIRS: &[(char, char)] = &[ ('[', ']'), ('<', '>'), ('\'', '\''), - ('"', '"'), + ('\"', '\"'), ]; + // limit matching pairs to only ( ) { } [ ] < > +// Returns the position of the matching bracket under cursor. +// +// If the cursor is one the opening bracket, the position of +// the closing bracket is returned. If the cursor in the closing +// bracket, the position of the opening bracket is returned. +// +// If the cursor is not on a bracket, `None` is returned. +#[must_use] +pub fn find_matching_bracket(syntax: &Syntax, doc: &Rope, pos: usize) -> Option<usize> { + if pos >= doc.len_chars() || !is_valid_bracket(doc.char(pos)) { + return None; + } + find_pair(syntax, doc, pos, false) +} + +// Returns the position of the bracket that is closing the current scope. +// +// If the cursor is on an opening or closing bracket, the function +// behaves equivalent to [`find_matching_bracket`]. +// +// If the cursor position is within a scope, the function searches +// for the surrounding scope that is surrounded by brackets and +// returns the position of the closing bracket for that scope. +// +// If no surrounding scope is found, the function returns `None`. #[must_use] -pub fn find(syntax: &Syntax, doc: &Rope, pos: usize) -> Option<usize> { +pub fn find_matching_bracket_fuzzy(syntax: &Syntax, doc: &Rope, pos: usize) -> Option<usize> { + find_pair(syntax, doc, pos, true) +} + +fn find_pair(syntax: &Syntax, doc: &Rope, pos: usize, traverse_parents: bool) -> Option<usize> { let tree = syntax.tree(); + let pos = doc.char_to_byte(pos); - let byte_pos = doc.char_to_byte(pos); + let mut node = tree.root_node().named_descendant_for_byte_range(pos, pos)?; - // most naive implementation: find the innermost syntax node, if we're at the edge of a node, - // return the other edge. + loop { + let (start_byte, end_byte) = surrounding_bytes(doc, &node)?; + let (start_char, end_char) = (doc.byte_to_char(start_byte), doc.byte_to_char(end_byte)); - let node = match tree - .root_node() - .named_descendant_for_byte_range(byte_pos, byte_pos) - { - Some(node) => node, - None => return None, - }; + if is_valid_pair(doc, start_char, end_char) { + if end_byte == pos { + return Some(start_char); + } + // We return the end char if the cursor is either on the start char + // or at some arbitrary position between start and end char. + return Some(end_char); + } - if node.is_error() { - return None; + if traverse_parents { + node = node.parent()?; + } else { + return None; + } } +} +fn is_valid_bracket(c: char) -> bool { + PAIRS.iter().any(|(l, r)| *l == c || *r == c) +} + +fn is_valid_pair(doc: &Rope, start_char: usize, end_char: usize) -> bool { + PAIRS.contains(&(doc.char(start_char), doc.char(end_char))) +} + +fn surrounding_bytes(doc: &Rope, node: &Node) -> Option<(usize, usize)> { let len = doc.len_bytes(); + let start_byte = node.start_byte(); - let end_byte = node.end_byte().saturating_sub(1); // it's end exclusive + let end_byte = node.end_byte().saturating_sub(1); + if start_byte >= len || end_byte >= len { return None; } - let start_char = doc.byte_to_char(start_byte); - let end_char = doc.byte_to_char(end_byte); - - if PAIRS.contains(&(doc.char(start_char), doc.char(end_char))) { - if start_byte == byte_pos { - return Some(end_char); - } - - if end_byte == byte_pos { - return Some(start_char); - } - } - - None + Some((start_byte, end_byte)) } diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs index 431265cd..e70773eb 100644 --- a/helix-term/src/commands.rs +++ b/helix-term/src/commands.rs @@ -4954,7 +4954,9 @@ fn match_brackets(cx: &mut Context) { if let Some(syntax) = doc.syntax() { let text = doc.text().slice(..); let selection = doc.selection(view.id).clone().transform(|range| { - if let Some(pos) = match_brackets::find(syntax, doc.text(), range.anchor) { + if let Some(pos) = + match_brackets::find_matching_bracket_fuzzy(syntax, doc.text(), range.anchor) + { range.put_cursor(text, pos, doc.mode == Mode::Select) } else { range diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs index 03cd0474..27d33d22 100644 --- a/helix-term/src/ui/editor.rs +++ b/helix-term/src/ui/editor.rs @@ -377,7 +377,7 @@ impl EditorView { use helix_core::match_brackets; let pos = doc.selection(view.id).primary().cursor(text); - let pos = match_brackets::find(syntax, doc.text(), pos) + let pos = match_brackets::find_matching_bracket(syntax, doc.text(), pos) .and_then(|pos| view.screen_coords_at_pos(doc, text, pos)); if let Some(pos) = pos { |