//! Movement module contains helper functions for calculating intended position//! in editor given a given motion (e.g. it handles converting a "move left" command into coordinates in editor). It is exposed mostly for use by vim crate. use super::{Bias, DisplayPoint, DisplaySnapshot, SelectionGoal, ToDisplayPoint};use crate::{scroll::ScrollAnchor, CharKind, DisplayRow, EditorStyle, ToOffset, ToPoint};use gpui::{Pixels, WindowTextSystem};use language::Point;use multi_buffer::{MultiBufferRow, MultiBufferSnapshot};use serde::Deserialize; use std::{ops::Range, sync::Arc}; /// Defines search strategy for items in `movement` module./// `FindRange::SingeLine` only looks for a match on a single line at a time, whereas/// `FindRange::MultiLine` keeps going until the end of a string.#[derive(Clone, Copy, Debug, PartialEq, Eq, Deserialize)]pub enum FindRange { SingleLine, MultiLine,} /// TextLayoutDetails encompasses everything we need to move vertically/// taking into account variable width characters.pub struct TextLayoutDetails { pub(crate) text_system: Arc<WindowTextSystem>, pub(crate) editor_style: EditorStyle, pub(crate) rem_size: Pixels, pub scroll_anchor: ScrollAnchor, pub visible_rows: Option<f32>, pub vertical_scroll_margin: f32,} /// Returns a column to the left of the current point, wrapping/// to the previous line if that point is at the start of line.pub fn left(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint { if point.column() > 0 { *point.column_mut() -= 1; } else if point.row().0 > 0 { *point.row_mut() -= 1; *point.column_mut() = map.line_len(point.row()); } map.clip_point(point, Bias::Left)} /// Returns a column to the left of the current point, doing nothing if/// that point is already at the start of line.pub fn saturating_left(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint { if point.column() > 0 { *point.column_mut() -= 1; } else if point.column() == 0 { // If the current sofr_wrap mode is used, the column corresponding to the display is 0, // which does not necessarily mean that the actual beginning of a paragraph if map.display_point_to_fold_point(point, Bias::Left).column() > 0 { return left(map, point); } } map.clip_point(point, Bias::Left)} /// Returns a column to the right of the current point, doing nothing// if that point is at the end of the line.pub fn right(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint { if point.column() < map.line_len(point.row()) { *point.column_mut() += 1; } else if point.row() < map.max_point().row() { *point.row_mut() += 1; *point.column_mut() = 0; } map.clip_point(point, Bias::Right)} /// Returns a column to the right of the current point, not performing any wrapping/// if that point is already at the end of line.pub fn saturating_right(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint { *point.column_mut() += 1; map.clip_point(point, Bias::Right)} /// Returns a display point for the preceding displayed line (which might be a soft-wrapped line).pub fn up( map: &DisplaySnapshot, start: DisplayPoint, goal: SelectionGoal, preserve_column_at_start: bool, text_layout_details: &TextLayoutDetails,) -> (DisplayPoint, SelectionGoal) { up_by_rows( map, start, 1, goal, preserve_column_at_start, text_layout_details, )} /// Returns a display point for the next displayed line (which might be a soft-wrapped line).pub fn down( map: &DisplaySnapshot, start: DisplayPoint, goal: SelectionGoal, preserve_column_at_end: bool, text_layout_details: &TextLayoutDetails,) -> (DisplayPoint, SelectionGoal) { down_by_rows( map, start, 1, goal, preserve_column_at_end, text_layout_details, )} pub(crate) fn up_by_rows( map: &DisplaySnapshot, start: DisplayPoint, row_count: u32, goal: SelectionGoal, preserve_column_at_start: bool, text_layout_details: &TextLayoutDetails,) -> (DisplayPoint, SelectionGoal) { let goal_x = match goal { SelectionGoal::HorizontalPosition(x) => x.into(), SelectionGoal::WrappedHorizontalPosition((_, x)) => x.into(), SelectionGoal::HorizontalRange { end, .. } => end.into(), _ => map.x_for_display_point(start, text_layout_details), }; let prev_row = DisplayRow(start.row().0.saturating_sub(row_count)); let mut point = map.clip_point( DisplayPoint::new(prev_row, map.line_len(prev_row)), Bias::Left, ); if point.row() < start.row() { *point.column_mut() = map.display_column_for_x(point.row(), goal_x, text_layout_details) } else if preserve_column_at_start { return (start, goal); } else { point = DisplayPoint::new(DisplayRow(0), 0); } let mut clipped_point = map.clip_point(point, Bias::Left); if clipped_point.row() < point.row() { clipped_point = map.clip_point(point, Bias::Right); } ( clipped_point, SelectionGoal::HorizontalPosition(goal_x.into()), )} pub(crate) fn down_by_rows( map: &DisplaySnapshot, start: DisplayPoint, row_count: u32, goal: SelectionGoal, preserve_column_at_end: bool, text_layout_details: &TextLayoutDetails,) -> (DisplayPoint, SelectionGoal) { let goal_x = match goal { SelectionGoal::HorizontalPosition(x) => x.into(), SelectionGoal::WrappedHorizontalPosition((_, x)) => x.into(), SelectionGoal::HorizontalRange { end, .. } => end.into(), _ => map.x_for_display_point(start, text_layout_details), }; let new_row = DisplayRow(start.row().0 + row_count); let mut point = map.clip_point(DisplayPoint::new(new_row, 0), Bias::Right); if point.row() > start.row() { *point.column_mut() = map.display_column_for_x(point.row(), goal_x, text_layout_details) } else if preserve_column_at_end { return (start, goal); } else { point = map.max_point(); } let mut clipped_point = map.clip_point(point, Bias::Right); if clipped_point.row() > point.row() { clipped_point = map.clip_point(point, Bias::Left); } ( clipped_point, SelectionGoal::HorizontalPosition(goal_x.into()), )} /// Returns a position of the start of line./// If `stop_at_soft_boundaries` is true, the returned position is that of the/// displayed line (e.g. it could actually be in the middle of a text line if that line is soft-wrapped)./// Otherwise it's always going to be the start of a logical line.pub fn line_beginning( map: &DisplaySnapshot, display_point: DisplayPoint, stop_at_soft_boundaries: bool,) -> DisplayPoint { let point = display_point.to_point(map); let soft_line_start = map.clip_point(DisplayPoint::new(display_point.row(), 0), Bias::Right); let line_start = map.prev_line_boundary(point).1; if stop_at_soft_boundaries && display_point != soft_line_start { soft_line_start } else { line_start }} /// Returns the last indented position on a given line./// If `stop_at_soft_boundaries` is true, the returned [`DisplayPoint`] is that of a/// displayed line (e.g. if there's soft wrap it's gonna be returned),/// otherwise it's always going to be a start of a logical line.pub fn indented_line_beginning( map: &DisplaySnapshot, display_point: DisplayPoint, stop_at_soft_boundaries: bool,) -> DisplayPoint { let point = display_point.to_point(map); let soft_line_start = map.clip_point(DisplayPoint::new(display_point.row(), 0), Bias::Right); let indent_start = Point::new( point.row, map.buffer_snapshot .indent_size_for_line(MultiBufferRow(point.row)) .len, ) .to_display_point(map); let line_start = map.prev_line_boundary(point).1; if stop_at_soft_boundaries && soft_line_start > indent_start && display_point != soft_line_start { soft_line_start } else if stop_at_soft_boundaries && display_point != indent_start { indent_start } else { line_start }} /// Returns a position of the end of line. /// If `stop_at_soft_boundaries` is true, the returned position is that of the/// displayed line (e.g. it could actually be in the middle of a text line if that line is soft-wrapped)./// Otherwise it's always going to be the end of a logical line.pub fn line_end( map: &DisplaySnapshot, display_point: DisplayPoint, stop_at_soft_boundaries: bool,) -> DisplayPoint { let soft_line_end = map.clip_point( DisplayPoint::new(display_point.row(), map.line_len(display_point.row())), Bias::Left, ); if stop_at_soft_boundaries && display_point != soft_line_end { soft_line_end } else { map.next_line_boundary(display_point.to_point(map)).1 }} /// Returns a position of the previous word boundary, where a word character is defined as either/// uppercase letter, lowercase letter, '_' character or language-specific word character (like '-' in CSS).pub fn previous_word_start(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_preceding_boundary_display_point(map, point, FindRange::MultiLine, |left, right| { (classifier.kind(left) != classifier.kind(right) && !classifier.is_whitespace(right)) || left == '\n' })} /// Returns a position of the previous word boundary, where a word character is defined as either/// uppercase letter, lowercase letter, '_' character, language-specific word character (like '-' in CSS) or newline.pub fn previous_word_start_or_newline(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_preceding_boundary_display_point(map, point, FindRange::MultiLine, |left, right| { (classifier.kind(left) != classifier.kind(right) && !right.is_whitespace()) || left == '\n' || right == '\n' })} /// Returns a position of the previous subword boundary, where a subword is defined as a run of/// word characters of the same "subkind" - where subcharacter kinds are '_' character,/// lowerspace characters and uppercase characters.pub fn previous_subword_start(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_preceding_boundary_display_point(map, point, FindRange::MultiLine, |left, right| { let is_word_start = classifier.kind(left) != classifier.kind(right) && !right.is_whitespace(); let is_subword_start = classifier.is_word('-') && left == '-' && right != '-' || left == '_' && right != '_' || left.is_lowercase() && right.is_uppercase(); is_word_start || is_subword_start || left == '\n' })} /// Returns a position of the next word boundary, where a word character is defined as either/// uppercase letter, lowercase letter, '_' character or language-specific word character (like '-' in CSS).pub fn next_word_end(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_boundary(map, point, FindRange::MultiLine, |left, right| { (classifier.kind(left) != classifier.kind(right) && !classifier.is_whitespace(left)) || right == '\n' })} /// Returns a position of the next word boundary, where a word character is defined as either/// uppercase letter, lowercase letter, '_' character, language-specific word character (like '-' in CSS) or newline.pub fn next_word_end_or_newline(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); let mut on_starting_row = true; find_boundary(map, point, FindRange::MultiLine, |left, right| { if left == '\n' { on_starting_row = false; } (classifier.kind(left) != classifier.kind(right) && ((on_starting_row && !left.is_whitespace()) || (!on_starting_row && !right.is_whitespace()))) || right == '\n' })} /// Returns a position of the next subword boundary, where a subword is defined as a run of/// word characters of the same "subkind" - where subcharacter kinds are '_' character,/// lowerspace characters and uppercase characters.pub fn next_subword_end(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_boundary(map, point, FindRange::MultiLine, |left, right| { let is_word_end = (classifier.kind(left) != classifier.kind(right)) && !classifier.is_whitespace(left); let is_subword_end = classifier.is_word('-') && left != '-' && right == '-' || left != '_' && right == '_' || left.is_lowercase() && right.is_uppercase(); is_word_end || is_subword_end || right == '\n' })} /// Returns a position of the start of the current paragraph, where a paragraph/// is defined as a run of non-blank lines.pub fn start_of_paragraph( map: &DisplaySnapshot, display_point: DisplayPoint, mut count: usize,) -> DisplayPoint { let point = display_point.to_point(map); if point.row == 0 { return DisplayPoint::zero(); } let mut found_non_blank_line = false; for row in (0..point.row + 1).rev() { let blank = map.buffer_snapshot.is_line_blank(MultiBufferRow(row)); if found_non_blank_line && blank { if count <= 1 { return Point::new(row, 0).to_display_point(map); } count -= 1; found_non_blank_line = false; } found_non_blank_line |= !blank; } DisplayPoint::zero()} /// Returns a position of the end of the current paragraph, where a paragraph/// is defined as a run of non-blank lines.pub fn end_of_paragraph( map: &DisplaySnapshot, display_point: DisplayPoint, mut count: usize,) -> DisplayPoint { let point = display_point.to_point(map); if point.row == map.buffer_snapshot.max_row().0 { return map.max_point(); } let mut found_non_blank_line = false; for row in point.row..=map.buffer_snapshot.max_row().0 { let blank = map.buffer_snapshot.is_line_blank(MultiBufferRow(row)); if found_non_blank_line && blank { if count <= 1 { return Point::new(row, 0).to_display_point(map); } count -= 1; found_non_blank_line = false; } found_non_blank_line |= !blank; } map.max_point()} /// Scans for a boundary preceding the given start point `from` until a boundary is found,/// indicated by the given predicate returning true./// The predicate is called with the character to the left and right of the candidate boundary location./// If FindRange::SingleLine is specified and no boundary is found before the start of the current line, the start of the current line will be returned.pub fn find_preceding_boundary_point( buffer_snapshot: &MultiBufferSnapshot, from: Point, find_range: FindRange, mut is_boundary: impl FnMut(char, char) -> bool,) -> Point { let mut prev_ch = None; let mut offset = from.to_offset(buffer_snapshot); for ch in buffer_snapshot.reversed_chars_at(offset) { if find_range == FindRange::SingleLine && ch == '\n' { break; } if let Some(prev_ch) = prev_ch { if is_boundary(ch, prev_ch) { break; } } offset -= ch.len_utf8(); prev_ch = Some(ch); } offset.to_point(buffer_snapshot)} /// Scans for a boundary preceding the given start point `from` until a boundary is found,/// indicated by the given predicate returning true./// The predicate is called with the character to the left and right of the candidate boundary location./// If FindRange::SingleLine is specified and no boundary is found before the start of the current line, the start of the current line will be returned.pub fn find_preceding_boundary_display_point( map: &DisplaySnapshot, from: DisplayPoint, find_range: FindRange, is_boundary: impl FnMut(char, char) -> bool,) -> DisplayPoint { let result = find_preceding_boundary_point( &map.buffer_snapshot, from.to_point(map), find_range, is_boundary, ); map.clip_point(result.to_display_point(map), Bias::Left)} /// Scans for a boundary following the given start point until a boundary is found, indicated by the/// given predicate returning true. The predicate is called with the character to the left and right/// of the candidate boundary location, and will be called with `\n` characters indicating the start/// or end of a line. The function supports optionally returning the point just before the boundary/// is found via return_point_before_boundary.pub fn find_boundary_point( map: &DisplaySnapshot, from: DisplayPoint, find_range: FindRange, mut is_boundary: impl FnMut(char, char) -> bool, return_point_before_boundary: bool,) -> DisplayPoint { let mut offset = from.to_offset(map, Bias::Right); let mut prev_offset = offset; let mut prev_ch = None; for ch in map.buffer_snapshot.chars_at(offset) { if find_range == FindRange::SingleLine && ch == '\n' { break; } if let Some(prev_ch) = prev_ch { if is_boundary(prev_ch, ch) { if return_point_before_boundary { return map.clip_point(prev_offset.to_display_point(map), Bias::Right); } else { break; } } } prev_offset = offset; offset += ch.len_utf8(); prev_ch = Some(ch); } map.clip_point(offset.to_display_point(map), Bias::Right)} pub fn find_preceding_boundary_trail( map: &DisplaySnapshot, head: DisplayPoint, mut is_boundary: impl FnMut(char, char) -> bool,) -> (Option<DisplayPoint>, DisplayPoint) { let mut offset = head.to_offset(map, Bias::Left); let mut trail_offset = None; let mut prev_ch = map.buffer_snapshot.chars_at(offset).next(); let mut forward = map.buffer_snapshot.reversed_chars_at(offset).peekable();Lines 1–500 of 1193. Load more
//! Movement module contains helper functions for calculating intended position //! in editor given a given motion (e.g. it handles converting a "move left" command into coordinates in editor). It is exposed mostly for use by vim crate. use super::{Bias, DisplayPoint, DisplaySnapshot, SelectionGoal, ToDisplayPoint}; use crate::{scroll::ScrollAnchor, CharKind, DisplayRow, EditorStyle, ToOffset, ToPoint}; use gpui::{Pixels, WindowTextSystem}; use language::Point; use multi_buffer::{MultiBufferRow, MultiBufferSnapshot}; use serde::Deserialize; use std::{ops::Range, sync::Arc}; /// Defines search strategy for items in `movement` module. /// `FindRange::SingeLine` only looks for a match on a single line at a time, whereas /// `FindRange::MultiLine` keeps going until the end of a string. #[derive(Clone, Copy, Debug, PartialEq, Eq, Deserialize)] pub enum FindRange { SingleLine, MultiLine, } /// TextLayoutDetails encompasses everything we need to move vertically /// taking into account variable width characters. pub struct TextLayoutDetails { pub(crate) text_system: Arc<WindowTextSystem>, pub(crate) editor_style: EditorStyle, pub(crate) rem_size: Pixels, pub scroll_anchor: ScrollAnchor, pub visible_rows: Option<f32>, pub vertical_scroll_margin: f32, } /// Returns a column to the left of the current point, wrapping /// to the previous line if that point is at the start of line. pub fn left(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint { if point.column() > 0 { *point.column_mut() -= 1; } else if point.row().0 > 0 { *point.row_mut() -= 1; *point.column_mut() = map.line_len(point.row()); } map.clip_point(point, Bias::Left) } /// Returns a column to the left of the current point, doing nothing if /// that point is already at the start of line. pub fn saturating_left(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint { if point.column() > 0 { *point.column_mut() -= 1; } else if point.column() == 0 { // If the current sofr_wrap mode is used, the column corresponding to the display is 0, // which does not necessarily mean that the actual beginning of a paragraph if map.display_point_to_fold_point(point, Bias::Left).column() > 0 { return left(map, point); } } map.clip_point(point, Bias::Left) } /// Returns a column to the right of the current point, doing nothing // if that point is at the end of the line. pub fn right(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint { if point.column() < map.line_len(point.row()) { *point.column_mut() += 1; } else if point.row() < map.max_point().row() { *point.row_mut() += 1; *point.column_mut() = 0; } map.clip_point(point, Bias::Right) } /// Returns a column to the right of the current point, not performing any wrapping /// if that point is already at the end of line. pub fn saturating_right(map: &DisplaySnapshot, mut point: DisplayPoint) -> DisplayPoint { *point.column_mut() += 1; map.clip_point(point, Bias::Right) } /// Returns a display point for the preceding displayed line (which might be a soft-wrapped line). pub fn up( map: &DisplaySnapshot, start: DisplayPoint, goal: SelectionGoal, preserve_column_at_start: bool, text_layout_details: &TextLayoutDetails, ) -> (DisplayPoint, SelectionGoal) { up_by_rows( map, start, 1, goal, preserve_column_at_start, text_layout_details, ) } /// Returns a display point for the next displayed line (which might be a soft-wrapped line). pub fn down( map: &DisplaySnapshot, start: DisplayPoint, goal: SelectionGoal, preserve_column_at_end: bool, text_layout_details: &TextLayoutDetails, ) -> (DisplayPoint, SelectionGoal) { down_by_rows( map, start, 1, goal, preserve_column_at_end, text_layout_details, ) } pub(crate) fn up_by_rows( map: &DisplaySnapshot, start: DisplayPoint, row_count: u32, goal: SelectionGoal, preserve_column_at_start: bool, text_layout_details: &TextLayoutDetails, ) -> (DisplayPoint, SelectionGoal) { let goal_x = match goal { SelectionGoal::HorizontalPosition(x) => x.into(), SelectionGoal::WrappedHorizontalPosition((_, x)) => x.into(), SelectionGoal::HorizontalRange { end, .. } => end.into(), _ => map.x_for_display_point(start, text_layout_details), }; let prev_row = DisplayRow(start.row().0.saturating_sub(row_count)); let mut point = map.clip_point( DisplayPoint::new(prev_row, map.line_len(prev_row)), Bias::Left, ); if point.row() < start.row() { *point.column_mut() = map.display_column_for_x(point.row(), goal_x, text_layout_details) } else if preserve_column_at_start { return (start, goal); } else { point = DisplayPoint::new(DisplayRow(0), 0); } let mut clipped_point = map.clip_point(point, Bias::Left); if clipped_point.row() < point.row() { clipped_point = map.clip_point(point, Bias::Right); } ( clipped_point, SelectionGoal::HorizontalPosition(goal_x.into()), ) } pub(crate) fn down_by_rows( map: &DisplaySnapshot, start: DisplayPoint, row_count: u32, goal: SelectionGoal, preserve_column_at_end: bool, text_layout_details: &TextLayoutDetails, ) -> (DisplayPoint, SelectionGoal) { let goal_x = match goal { SelectionGoal::HorizontalPosition(x) => x.into(), SelectionGoal::WrappedHorizontalPosition((_, x)) => x.into(), SelectionGoal::HorizontalRange { end, .. } => end.into(), _ => map.x_for_display_point(start, text_layout_details), }; let new_row = DisplayRow(start.row().0 + row_count); let mut point = map.clip_point(DisplayPoint::new(new_row, 0), Bias::Right); if point.row() > start.row() { *point.column_mut() = map.display_column_for_x(point.row(), goal_x, text_layout_details) } else if preserve_column_at_end { return (start, goal); } else { point = map.max_point(); } let mut clipped_point = map.clip_point(point, Bias::Right); if clipped_point.row() > point.row() { clipped_point = map.clip_point(point, Bias::Left); } ( clipped_point, SelectionGoal::HorizontalPosition(goal_x.into()), ) } /// Returns a position of the start of line. /// If `stop_at_soft_boundaries` is true, the returned position is that of the /// displayed line (e.g. it could actually be in the middle of a text line if that line is soft-wrapped). /// Otherwise it's always going to be the start of a logical line. pub fn line_beginning( map: &DisplaySnapshot, display_point: DisplayPoint, stop_at_soft_boundaries: bool, ) -> DisplayPoint { let point = display_point.to_point(map); let soft_line_start = map.clip_point(DisplayPoint::new(display_point.row(), 0), Bias::Right); let line_start = map.prev_line_boundary(point).1; if stop_at_soft_boundaries && display_point != soft_line_start { soft_line_start } else { line_start } } /// Returns the last indented position on a given line. /// If `stop_at_soft_boundaries` is true, the returned [`DisplayPoint`] is that of a /// displayed line (e.g. if there's soft wrap it's gonna be returned), /// otherwise it's always going to be a start of a logical line. pub fn indented_line_beginning( map: &DisplaySnapshot, display_point: DisplayPoint, stop_at_soft_boundaries: bool, ) -> DisplayPoint { let point = display_point.to_point(map); let soft_line_start = map.clip_point(DisplayPoint::new(display_point.row(), 0), Bias::Right); let indent_start = Point::new( point.row, map.buffer_snapshot .indent_size_for_line(MultiBufferRow(point.row)) .len, ) .to_display_point(map); let line_start = map.prev_line_boundary(point).1; if stop_at_soft_boundaries && soft_line_start > indent_start && display_point != soft_line_start { soft_line_start } else if stop_at_soft_boundaries && display_point != indent_start { indent_start } else { line_start } } /// Returns a position of the end of line. /// If `stop_at_soft_boundaries` is true, the returned position is that of the /// displayed line (e.g. it could actually be in the middle of a text line if that line is soft-wrapped). /// Otherwise it's always going to be the end of a logical line. pub fn line_end( map: &DisplaySnapshot, display_point: DisplayPoint, stop_at_soft_boundaries: bool, ) -> DisplayPoint { let soft_line_end = map.clip_point( DisplayPoint::new(display_point.row(), map.line_len(display_point.row())), Bias::Left, ); if stop_at_soft_boundaries && display_point != soft_line_end { soft_line_end } else { map.next_line_boundary(display_point.to_point(map)).1 } } /// Returns a position of the previous word boundary, where a word character is defined as either /// uppercase letter, lowercase letter, '_' character or language-specific word character (like '-' in CSS). pub fn previous_word_start(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_preceding_boundary_display_point(map, point, FindRange::MultiLine, |left, right| { (classifier.kind(left) != classifier.kind(right) && !classifier.is_whitespace(right)) || left == '\n' }) } /// Returns a position of the previous word boundary, where a word character is defined as either /// uppercase letter, lowercase letter, '_' character, language-specific word character (like '-' in CSS) or newline. pub fn previous_word_start_or_newline(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_preceding_boundary_display_point(map, point, FindRange::MultiLine, |left, right| { (classifier.kind(left) != classifier.kind(right) && !right.is_whitespace()) || left == '\n' || right == '\n' }) } /// Returns a position of the previous subword boundary, where a subword is defined as a run of /// word characters of the same "subkind" - where subcharacter kinds are '_' character, /// lowerspace characters and uppercase characters. pub fn previous_subword_start(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_preceding_boundary_display_point(map, point, FindRange::MultiLine, |left, right| { let is_word_start = classifier.kind(left) != classifier.kind(right) && !right.is_whitespace(); let is_subword_start = classifier.is_word('-') && left == '-' && right != '-' || left == '_' && right != '_' || left.is_lowercase() && right.is_uppercase(); is_word_start || is_subword_start || left == '\n' }) } /// Returns a position of the next word boundary, where a word character is defined as either /// uppercase letter, lowercase letter, '_' character or language-specific word character (like '-' in CSS). pub fn next_word_end(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_boundary(map, point, FindRange::MultiLine, |left, right| { (classifier.kind(left) != classifier.kind(right) && !classifier.is_whitespace(left)) || right == '\n' }) } /// Returns a position of the next word boundary, where a word character is defined as either /// uppercase letter, lowercase letter, '_' character, language-specific word character (like '-' in CSS) or newline. pub fn next_word_end_or_newline(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); let mut on_starting_row = true; find_boundary(map, point, FindRange::MultiLine, |left, right| { if left == '\n' { on_starting_row = false; } (classifier.kind(left) != classifier.kind(right) && ((on_starting_row && !left.is_whitespace()) || (!on_starting_row && !right.is_whitespace()))) || right == '\n' }) } /// Returns a position of the next subword boundary, where a subword is defined as a run of /// word characters of the same "subkind" - where subcharacter kinds are '_' character, /// lowerspace characters and uppercase characters. pub fn next_subword_end(map: &DisplaySnapshot, point: DisplayPoint) -> DisplayPoint { let raw_point = point.to_point(map); let classifier = map.buffer_snapshot.char_classifier_at(raw_point); find_boundary(map, point, FindRange::MultiLine, |left, right| { let is_word_end = (classifier.kind(left) != classifier.kind(right)) && !classifier.is_whitespace(left); let is_subword_end = classifier.is_word('-') && left != '-' && right == '-' || left != '_' && right == '_' || left.is_lowercase() && right.is_uppercase(); is_word_end || is_subword_end || right == '\n' }) } /// Returns a position of the start of the current paragraph, where a paragraph /// is defined as a run of non-blank lines. pub fn start_of_paragraph( map: &DisplaySnapshot, display_point: DisplayPoint, mut count: usize, ) -> DisplayPoint { let point = display_point.to_point(map); if point.row == 0 { return DisplayPoint::zero(); } let mut found_non_blank_line = false; for row in (0..point.row + 1).rev() { let blank = map.buffer_snapshot.is_line_blank(MultiBufferRow(row)); if found_non_blank_line && blank { if count <= 1 { return Point::new(row, 0).to_display_point(map); } count -= 1; found_non_blank_line = false; } found_non_blank_line |= !blank; } DisplayPoint::zero() } /// Returns a position of the end of the current paragraph, where a paragraph /// is defined as a run of non-blank lines. pub fn end_of_paragraph( map: &DisplaySnapshot, display_point: DisplayPoint, mut count: usize, ) -> DisplayPoint { let point = display_point.to_point(map); if point.row == map.buffer_snapshot.max_row().0 { return map.max_point(); } let mut found_non_blank_line = false; for row in point.row..=map.buffer_snapshot.max_row().0 { let blank = map.buffer_snapshot.is_line_blank(MultiBufferRow(row)); if found_non_blank_line && blank { if count <= 1 { return Point::new(row, 0).to_display_point(map); } count -= 1; found_non_blank_line = false; } found_non_blank_line |= !blank; } map.max_point() } /// Scans for a boundary preceding the given start point `from` until a boundary is found, /// indicated by the given predicate returning true. /// The predicate is called with the character to the left and right of the candidate boundary location. /// If FindRange::SingleLine is specified and no boundary is found before the start of the current line, the start of the current line will be returned. pub fn find_preceding_boundary_point( buffer_snapshot: &MultiBufferSnapshot, from: Point, find_range: FindRange, mut is_boundary: impl FnMut(char, char) -> bool, ) -> Point { let mut prev_ch = None; let mut offset = from.to_offset(buffer_snapshot); for ch in buffer_snapshot.reversed_chars_at(offset) { if find_range == FindRange::SingleLine && ch == '\n' { break; } if let Some(prev_ch) = prev_ch { if is_boundary(ch, prev_ch) { break; } } offset -= ch.len_utf8(); prev_ch = Some(ch); } offset.to_point(buffer_snapshot) } /// Scans for a boundary preceding the given start point `from` until a boundary is found, /// indicated by the given predicate returning true. /// The predicate is called with the character to the left and right of the candidate boundary location. /// If FindRange::SingleLine is specified and no boundary is found before the start of the current line, the start of the current line will be returned. pub fn find_preceding_boundary_display_point( map: &DisplaySnapshot, from: DisplayPoint, find_range: FindRange, is_boundary: impl FnMut(char, char) -> bool, ) -> DisplayPoint { let result = find_preceding_boundary_point( &map.buffer_snapshot, from.to_point(map), find_range, is_boundary, ); map.clip_point(result.to_display_point(map), Bias::Left) } /// Scans for a boundary following the given start point until a boundary is found, indicated by the /// given predicate returning true. The predicate is called with the character to the left and right /// of the candidate boundary location, and will be called with `\n` characters indicating the start /// or end of a line. The function supports optionally returning the point just before the boundary /// is found via return_point_before_boundary. pub fn find_boundary_point( map: &DisplaySnapshot, from: DisplayPoint, find_range: FindRange, mut is_boundary: impl FnMut(char, char) -> bool, return_point_before_boundary: bool, ) -> DisplayPoint { let mut offset = from.to_offset(map, Bias::Right); let mut prev_offset = offset; let mut prev_ch = None; for ch in map.buffer_snapshot.chars_at(offset) { if find_range == FindRange::SingleLine && ch == '\n' { break; } if let Some(prev_ch) = prev_ch { if is_boundary(prev_ch, ch) { if return_point_before_boundary { return map.clip_point(prev_offset.to_display_point(map), Bias::Right); } else { break; } } } prev_offset = offset; offset += ch.len_utf8(); prev_ch = Some(ch); } map.clip_point(offset.to_display_point(map), Bias::Right) } pub fn find_preceding_boundary_trail( map: &DisplaySnapshot, head: DisplayPoint, mut is_boundary: impl FnMut(char, char) -> bool, ) -> (Option<DisplayPoint>, DisplayPoint) { let mut offset = head.to_offset(map, Bias::Left); let mut trail_offset = None; let mut prev_ch = map.buffer_snapshot.chars_at(offset).next(); let mut forward = map.buffer_snapshot.reversed_chars_at(offset).peekable();