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Split selection on regex, fix InputEdit generation.

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This commit is contained in:
Blaž Hrastnik 2020-09-29 01:01:27 +09:00
parent 3020077da8
commit 36e7e2133f
6 changed files with 146 additions and 23 deletions
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5
helix-core/src/lib.rs
View File

@ -2,7 +2,7 @@
pub mod graphemes;
pub mod macros;
mod position;
mod selection;
pub mod selection;
pub mod state;
pub mod syntax;
mod transaction;
@ -11,6 +11,9 @@
pub use tendril::StrTendril as Tendril;
#[doc(inline)]
pub use {regex, tree_sitter};
pub use position::Position;
pub use selection::Range;
pub use selection::Selection;

76
helix-core/src/selection.rs
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@ -2,8 +2,9 @@
//! single selection range.
//!
//! All positioning is done via `char` offsets into the buffer.
use crate::{Assoc, ChangeSet};
use crate::{Assoc, ChangeSet, Rope, RopeSlice};
use smallvec::{smallvec, SmallVec};
use std::borrow::Cow;
#[inline]
fn abs_difference(x: usize, y: usize) -> usize {
@ -22,7 +23,7 @@ pub struct Range {
pub anchor: usize,
/// The head of the range, moved when extending.
pub head: usize,
}
} // TODO: might be cheaper to store normalized as from/to and an inverted flag
impl Range {
pub fn new(anchor: usize, head: usize) -> Self {
@ -106,6 +107,11 @@ pub fn extend(&self, from: usize, to: usize) -> Self {
}
// groupAt
#[inline]
pub fn fragment<'a>(&'a self, text: &'a RopeSlice) -> Cow<'a, str> {
Cow::from(text.slice(self.from()..self.to()))
}
}
/// A selection consists of one or more selection ranges.
@ -239,10 +245,50 @@ pub fn transform<F>(&self, f: F) -> Self
self.primary_index,
)
}
pub fn fragments<'a>(&'a self, text: &'a RopeSlice) -> impl Iterator<Item = Cow<str>> + 'a {
self.ranges.iter().map(move |range| range.fragment(text))
}
}
// TODO: checkSelection -> check if valid for doc length
// TODO: support to split on capture #N instead of whole match
pub fn split_on_matches(
text: &RopeSlice,
selections: &Selection,
regex: &crate::regex::Regex,
) -> Selection {
let mut result = SmallVec::with_capacity(selections.ranges().len());
for sel in selections.ranges() {
// TODO: can't avoid occasional allocations since Regex can't operate on chunks yet
let fragment = sel.fragment(&text);
let mut sel_start = sel.from();
let sel_end = sel.to();
let mut start_byte = text.char_to_byte(sel_start);
let mut start = sel_start;
for mat in regex.find_iter(&fragment) {
// TODO: retain range direction
let end = text.byte_to_char(start_byte + mat.start());
result.push(Range::new(start, end - 1));
start = text.byte_to_char(start_byte + mat.end());
}
if start <= sel_end {
result.push(Range::new(start, sel_end));
}
}
// TODO: figure out a new primary index
Selection::new(result, 0)
}
#[cfg(test)]
mod test {
use super::*;
@ -312,4 +358,30 @@ fn test_contains() {
assert_eq!(range.contains(6), false);
}
#[test]
fn test_split_on_matches() {
use crate::regex::Regex;
let text = Rope::from("abcd efg wrs xyz 123 456");
let selections = Selection::new(smallvec![Range::new(0, 8), Range::new(10, 19),], 0);
let result = split_on_matches(&text.slice(..), &selections, &Regex::new(r"\s+").unwrap());
assert_eq!(
result.ranges(),
&[
Range::new(0, 4),
Range::new(5, 8),
Range::new(10, 12),
Range::new(15, 18),
Range::new(19, 19),
]
);
assert_eq!(
result.fragments(&text.slice(..)).collect::<Vec<_>>(),
&["abcd", "efg", "rs", "xyz", ""]
);
}
}

48
helix-core/src/syntax.rs
View File

@ -188,9 +188,19 @@ pub fn new(
syntax
}
pub fn update(&mut self, source: &Rope, changeset: &ChangeSet) -> Result<(), Error> {
self.root_layer
.update(&mut self.parser, &self.config, source, changeset)
pub fn update(
&mut self,
old_source: &Rope,
source: &Rope,
changeset: &ChangeSet,
) -> Result<(), Error> {
self.root_layer.update(
&mut self.parser,
&self.config,
old_source,
source,
changeset,
)
// TODO: deal with injections and update them too
}
@ -385,7 +395,7 @@ fn parse(
}
pub(crate) fn generate_edits(
text: &RopeSlice,
old_text: &RopeSlice,
changeset: &ChangeSet,
) -> Vec<tree_sitter::InputEdit> {
use Operation::*;
@ -399,7 +409,7 @@ pub(crate) fn generate_edits(
// TODO; this is a lot easier with Change instead of Operation.
fn point_at_pos(text: &RopeSlice, pos: usize) -> (usize, Point) {
let byte = text.char_to_byte(pos);
let byte = text.char_to_byte(pos); // <- attempted to index past end
let line = text.char_to_line(pos);
let line_start_byte = text.line_to_byte(line);
let col = byte - line_start_byte;
@ -437,8 +447,8 @@ fn traverse(point: Point, text: &Tendril) -> Point {
new_pos += len;
}
Delete(_) => {
let (start_byte, start_position) = point_at_pos(&text, old_pos);
let (old_end_byte, old_end_position) = point_at_pos(&text, old_end);
let (start_byte, start_position) = point_at_pos(&old_text, old_pos);
let (old_end_byte, old_end_position) = point_at_pos(&old_text, old_end);
// TODO: Position also needs to be byte based...
// let byte = char_to_byte(old_pos)
@ -475,7 +485,7 @@ fn traverse(point: Point, text: &Tendril) -> Point {
};
}
Insert(s) => {
let (start_byte, start_position) = point_at_pos(&text, old_pos);
let (start_byte, start_position) = point_at_pos(&old_text, old_pos);
let ins = s.chars().count();
@ -501,6 +511,7 @@ fn update(
&mut self,
parser: &mut Parser,
config: &HighlightConfiguration,
old_source: &Rope,
source: &Rope,
changeset: &ChangeSet,
) -> Result<(), Error> {
@ -508,7 +519,7 @@ fn update(
return Ok(());
}
let edits = Self::generate_edits(&source.slice(..), changeset);
let edits = Self::generate_edits(&old_source.slice(..), changeset);
// Notify the tree about all the changes
for edit in edits {
@ -1530,4 +1541,23 @@ fn test_input_edits() {
}
]
);
// Testing with the official example from tree-sitter
let mut state = State::new("fn test() {}".into());
let transaction = Transaction::change(&state, vec![(8, 8, Some("a: u32".into()))].into_iter());
let edits = LanguageLayer::generate_edits(&state.doc.slice(..), &transaction.changes);
transaction.apply(&mut state);
assert_eq!(state.doc(), "fn test(a: u32) {}");
assert_eq!(
edits,
&[InputEdit {
start_byte: 8,
old_end_byte: 8,
new_end_byte: 14,
start_position: Point { row: 0, column: 8 },
old_end_position: Point { row: 0, column: 8 },
new_end_position: Point { row: 0, column: 14 }
}]
);
}

25
helix-core/src/transaction.rs
View File

@ -326,9 +326,20 @@ pub fn new(state: &mut State) -> Self {
/// Returns true if applied successfully.
pub fn apply(&self, state: &mut State) -> bool {
// apply changes to the document
if !self.changes.apply(&mut state.doc) {
return false;
if !self.changes.is_empty() {
// TODO: also avoid mapping the selection if not necessary
let old_doc = state.doc().clone();
// apply changes to the document
if !self.changes.apply(&mut state.doc) {
return false;
}
if let Some(syntax) = &mut state.syntax {
// TODO: no unwrap
syntax.update(&old_doc, &state.doc, &self.changes).unwrap();
}
}
// update the selection: either take the selection specified in the transaction, or map the
@ -338,14 +349,6 @@ pub fn apply(&self, state: &mut State) -> bool {
.clone()
.unwrap_or_else(|| state.selection.clone().map(&self.changes));
// TODO: no unwrap
state
.syntax
.as_mut()
.unwrap()
.update(&state.doc, &self.changes)
.unwrap();
true
}

11
helix-view/src/commands.rs
View File

@ -1,8 +1,11 @@
use helix_core::{
graphemes,
regex::Regex,
selection,
state::{Direction, Granularity, Mode, State},
Range, Selection, Tendril, Transaction,
};
use once_cell::sync::Lazy;
use crate::view::View;
@ -144,6 +147,14 @@ pub fn extend_line_down(view: &mut View, count: usize) {
.extend_selection(Direction::Forward, Granularity::Line, count);
}
pub fn split_selection_on_newline(view: &mut View, _count: usize) {
let text = &view.state.doc.slice(..);
// only compile the regex once
static REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"\n").unwrap());
// TODO: use a transaction
view.state.selection = selection::split_on_matches(text, view.state.selection(), &REGEX)
}
pub fn delete_selection(view: &mut View, _count: usize) {
let transaction =
Transaction::change_by_selection(&view.state, |range| (range.from(), range.to(), None));

4
helix-view/src/keymap.rs
View File

@ -174,6 +174,10 @@ pub fn default() -> Keymaps {
code: KeyCode::Char('c'),
modifiers: Modifiers::NONE
}] => commands::change_selection as Command,
vec![Key {
code: KeyCode::Char('s'),
modifiers: Modifiers::NONE
}] => commands::split_selection_on_newline as Command,
vec![Key {
code: KeyCode::Esc,
modifiers: Modifiers::NONE