match pairs which don't form a standalone TS node

This commit is contained in:
Pascal Kuthe 2023-06-06 00:57:28 +02:00 committed by Blaž Hrastnik
parent eb81cf3c01
commit 37058e0401

View file

@ -1,8 +1,11 @@
use std::iter;
use tree_sitter::Node;
use crate::{Rope, Syntax};
const MAX_PLAINTEXT_SCAN: usize = 10000;
const MATCH_LIMIT: usize = 16;
// Limit matching pairs to only ( ) { } [ ] < > ' ' " "
const PAIRS: &[(char, char)] = &[
@ -50,9 +53,10 @@ fn find_pair(syntax: &Syntax, doc: &Rope, pos: usize, traverse_parents: bool) ->
let tree = syntax.tree();
let pos = doc.char_to_byte(pos);
let mut node = tree.root_node().named_descendant_for_byte_range(pos, pos)?;
let mut node = tree.root_node().descendant_for_byte_range(pos, pos)?;
loop {
if node.is_named() {
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));
@ -64,13 +68,41 @@ fn find_pair(syntax: &Syntax, doc: &Rope, pos: usize, traverse_parents: bool) ->
// or at some arbitrary position between start and end char.
return Some(end_char);
}
}
// this node itselt wasn't a pair but maybe its siblings are
if traverse_parents {
node = node.parent()?;
} else {
// check if we are *on* the pair (special cased so we don't look
// at the current node twice and to jump to the start on that case)
if let Some(open) = as_close_pair(doc, &node) {
if let Some(pair_start) = find_pair_end(doc, node.prev_sibling(), open, Backward) {
return Some(pair_start);
}
}
if !traverse_parents {
// check if we are *on* the opening pair (special cased here as
// an opptimization since we only care about bracket on the cursor
// here)
if let Some(close) = as_open_pair(doc, &node) {
if let Some(pair_end) = find_pair_end(doc, node.next_sibling(), close, Forward) {
return Some(pair_end);
}
}
if node.is_named() {
return None;
}
}
for close in
iter::successors(node.next_sibling(), |node| node.next_sibling()).take(MATCH_LIMIT)
{
let Some(open) = as_close_pair(doc, &close) else { continue; };
if find_pair_end(doc, Some(node), open, Backward).is_some() {
return doc.try_byte_to_char(close.start_byte()).ok();
}
}
node = node.parent()?;
}
}
/// Returns the position of the matching bracket under cursor.
@ -161,6 +193,60 @@ fn surrounding_bytes(doc: &Rope, node: &Node) -> Option<(usize, usize)> {
Some((start_byte, end_byte))
}
/// Checks if `node` or its siblings (at most MATCH_LIMIT nodes) is the specified openiing char
///
/// # Returns
///
/// The position of the found node or `None` otherwise
fn find_open_pair(doc: &Rope, node: Option<Node>, open: char) -> Option<usize> {
iter::successors(node, |node| node.prev_sibling())
.take(MATCH_LIMIT)
.find_map(|node| {
let (pos, c) = as_char(doc, &node)?;
(c == open).then_some(pos)
})
}
/// Tests if this node is a pair close char and returns the expected open char
fn as_close_pair(doc: &Rope, node: &Node) -> Option<char> {
let close = as_char(doc, node)?.1;
PAIRS
.iter()
.find_map(|&(open, close_)| (close_ == close).then_some(open))
}
/// Checks if `node` or its siblings (at most MATCH_LIMIT nodes) is the specified closing char
///
/// # Returns
///
/// The position of the found node or `None` otherwise
fn find_close_pair(doc: &Rope, node: Option<Node>, close: char) -> Option<usize> {
iter::successors(node, |node| node.next_sibling())
.take(MATCH_LIMIT)
.find_map(|node| {
let (pos, c) = as_char(doc, &node)?;
(end_char == c).then_some(pos)
})
}
/// Tests if this node is a pair close char and returns the expected open char
fn as_open_pair(doc: &Rope, node: &Node) -> Option<char> {
let close = as_char(doc, node)?.1;
PAIRS
.iter()
.find_map(|&(open_, close)| (open_ == open).then_some(close))
}
/// Tests if this node is a pair opening and returns the expected close char
fn as_char(doc: &Rope, node: &Node) -> Option<(usize, char)> {
// TODO: multi char/non ASCII pairs
if node.byte_range().len() != 1 {
return None;
}
let pos = doc.try_byte_to_char(node.start_byte()).ok()?;
Some((pos, doc.char(pos)))
}
#[cfg(test)]
mod tests {
use super::*;