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Add extend-indented and stop-extend captures for indent queries.

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Improve and re-enable python indent queries.
This commit is contained in:
Triton171 2022-08-09 22:32:13 +02:00 • committed by Blaž Hrastnik
parent 8c4ae4df1c
commit 3ab9abb642
3 changed files with 155 additions and 22 deletions
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150
helix-core/src/indent.rs
View file

@ -192,13 +192,15 @@ pub fn indent_level_for_line(line: RopeSlice, tab_width: usize) -> usize {
/// Computes for node and all ancestors whether they are the first node on their line.
/// The first entry in the return value represents the root node, the last one the node itself
fn get_first_in_line(mut node: Node, byte_pos: usize, new_line: bool) -> Vec<bool> {
fn get_first_in_line(mut node: Node, new_line_byte_pos: Option<usize>) -> Vec<bool> {
let mut first_in_line = Vec::new();
loop {
if let Some(prev) = node.prev_sibling() {
// If we insert a new line, the first node at/after the cursor is considered to be the first in its line
let first = prev.end_position().row != node.start_position().row
|| (new_line && node.start_byte() >= byte_pos && prev.start_byte() < byte_pos);
|| new_line_byte_pos.map_or(false, |byte_pos| {
node.start_byte() >= byte_pos && prev.start_byte() < byte_pos
});
first_in_line.push(Some(first));
} else {
// Nodes that have no previous siblings are first in their line if and only if their parent is
@ -298,8 +300,21 @@ enum IndentScope {
Tail,
}
/// Execute the indent query.
/// Returns for each node (identified by its id) a list of indent captures for that node.
/// A capture from the indent query which does not define an indent but extends
/// the range of a node. This is used before the indent is calculated.
enum ExtendCapture {
ExtendIndented,
StopExtend,
}
/// The result of running a tree-sitter indent query. This stores for
/// each node (identified by its ID) the relevant captures (already filtered
/// by predicates).
struct IndentQueryResult {
indent_captures: HashMap<usize, Vec<IndentCapture>>,
extend_captures: HashMap<usize, Vec<ExtendCapture>>,
}
fn query_indents(
query: &Query,
syntax: &Syntax,
@ -309,8 +324,9 @@ fn query_indents(
// Position of the (optional) newly inserted line break.
// Given as (line, byte_pos)
new_line_break: Option<(usize, usize)>,
) -> HashMap<usize, Vec<IndentCapture>> {
) -> IndentQueryResult {
let mut indent_captures: HashMap<usize, Vec<IndentCapture>> = HashMap::new();
let mut extend_captures: HashMap<usize, Vec<ExtendCapture>> = HashMap::new();
cursor.set_byte_range(range);
// Iterate over all captures from the query
for m in cursor.matches(query, syntax.tree().root_node(), RopeProvider(text)) {
@ -374,10 +390,24 @@ fn query_indents(
continue;
}
for capture in m.captures {
let capture_type = query.capture_names()[capture.index as usize].as_str();
let capture_type = match capture_type {
let capture_name = query.capture_names()[capture.index as usize].as_str();
let capture_type = match capture_name {
"indent" => IndentCaptureType::Indent,
"outdent" => IndentCaptureType::Outdent,
"extend-indented" => {
extend_captures
.entry(capture.node.id())
.or_insert_with(|| Vec::with_capacity(1))
.push(ExtendCapture::ExtendIndented);
continue;
}
"stop-extend" => {
extend_captures
.entry(capture.node.id())
.or_insert_with(|| Vec::with_capacity(1))
.push(ExtendCapture::StopExtend);
continue;
}
_ => {
// Ignore any unknown captures (these may be needed for predicates such as #match?)
continue;
@ -420,7 +450,10 @@ fn query_indents(
.push(indent_capture);
}
}
indent_captures
IndentQueryResult {
indent_captures,
extend_captures,
}
}
/// Use the syntax tree to determine the indentation for a given position.
@ -463,36 +496,114 @@ pub fn treesitter_indent_for_pos(
query: &Query,
syntax: &Syntax,
indent_style: &IndentStyle,
tab_width: usize,
text: RopeSlice,
line: usize,
pos: usize,
new_line: bool,
) -> Option<String> {
let byte_pos = text.char_to_byte(pos);
// The innermost tree-sitter node which is considered for the indent
// computation. It may change if some predeceding node is extended
let mut node = syntax
.tree()
.root_node()
.descendant_for_byte_range(byte_pos, byte_pos)?;
let mut first_in_line = get_first_in_line(node, byte_pos, new_line);
let new_line_break = if new_line {
Some((line, byte_pos))
} else {
None
};
let query_result = crate::syntax::PARSER.with(|ts_parser| {
let (query_result, prev_child) = crate::syntax::PARSER.with(|ts_parser| {
let mut ts_parser = ts_parser.borrow_mut();
let mut cursor = ts_parser.cursors.pop().unwrap_or_else(QueryCursor::new);
// The query range should intersect with all nodes directly preceding
// the cursor in case one of them is extended.
// prev_child is the deepest such node.
let (query_range, prev_child) = {
// TODO Is there some way we can reuse this cursor?
let mut tree_cursor = node.walk();
let mut prev_child = None;
for child in node.children(&mut tree_cursor) {
if child.byte_range().end <= byte_pos {
prev_child = Some(child);
}
}
match prev_child {
Some(mut prev_child) => {
// Get the deepest directly preceding node
while prev_child.child_count() > 0 {
prev_child = prev_child.child(prev_child.child_count() - 1).unwrap();
}
(
prev_child.byte_range().end - 1..byte_pos + 1,
Some(prev_child),
)
}
None => (byte_pos..byte_pos + 1, None),
}
};
let query_result = query_indents(
query,
syntax,
&mut cursor,
text,
byte_pos..byte_pos + 1,
new_line_break,
query_range,
new_line.then(|| (line, byte_pos)),
);
ts_parser.cursors.push(cursor);
query_result
(query_result, prev_child)
});
let indent_captures = query_result.indent_captures;
let extend_captures = query_result.extend_captures;
// Check for extend captures (starting with the deepest
// candidate node and then going up the syntax tree).
if let Some(mut prev_child) = prev_child {
let mut stop_extend = false;
while prev_child != node {
let mut extend_node = false;
if let Some(captures) = extend_captures.get(&prev_child.id()) {
for capture in captures {
match capture {
ExtendCapture::StopExtend => {
stop_extend = true;
}
ExtendCapture::ExtendIndented => {
// We extend the node if
// - the cursor is on the same line as the end of the node OR
// - the line that the cursor is on is more indented than the
// first line of the node
if prev_child.end_position().row == line {
extend_node = true;
} else {
let cursor_indent =
indent_level_for_line(text.line(line), tab_width);
let node_indent = indent_level_for_line(
text.line(prev_child.start_position().row),
tab_width,
);
if cursor_indent > node_indent {
extend_node = true;
}
}
}
}
}
}
// If we encountered some `StopExtend` capture before, we don't
// extend the node even if we otherwise would
match (extend_node, stop_extend) {
(true, true) => {
stop_extend = false;
}
(true, false) => {
node = prev_child;
break;
}
_ => {}
};
// This parent always exists since node is an ancestor of prev_child
prev_child = prev_child.parent().unwrap();
}
}
let mut first_in_line = get_first_in_line(node, new_line.then(|| byte_pos));
let mut result = Indentation::default();
// We always keep track of all the indent changes on one line, in order to only indent once
@ -504,7 +615,7 @@ pub fn treesitter_indent_for_pos(
// one entry for each ancestor of the node (which is what we iterate over)
let is_first = *first_in_line.last().unwrap();
// Apply all indent definitions for this node
if let Some(definitions) = query_result.get(&node.id()) {
if let Some(definitions) = indent_captures.get(&node.id()) {
for definition in definitions {
match definition.scope {
IndentScope::All => {
@ -579,6 +690,7 @@ pub fn indent_for_newline(
query,
syntax,
indent_style,
tab_width,
text,
line_before,
line_before_end_pos,

1
helix-core/tests/indent.rs
View file

@ -50,6 +50,7 @@ fn test_treesitter_indent(file_name: &str, lang_scope: &str) {
indent_query,
&syntax,
&IndentStyle::Spaces(4),
4,
text,
i,
text.line_to_char(i) + pos,

26
runtime/queries/python/indents.scm_ → runtime/queries/python/indents.scm
View file

@ -27,12 +27,32 @@
(class_definition)
] @indent
[
(if_statement)
(for_statement)
(while_statement)
(with_statement)
(try_statement)
(function_definition)
(class_definition)
] @extend-indented
[
(return_statement)
(break_statement)
(continue_statement)
(raise_statement)
(pass_statement)
] @stop-extend
[
")"
"]"
"}"
(return_statement)
(pass_statement)
(raise_statement)
] @outdent
(elif_clause
"elif" @outdent)
(else_clause
"else" @outdent)