468 lines
14 KiB
Rust
468 lines
14 KiB
Rust
#![allow(dead_code)]
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use buffer::Buffer;
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use std::path::Path;
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use std::cmp::min;
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use files::{load_file_to_buffer, save_buffer_to_file};
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use string_utils::grapheme_count;
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/// A text cursor. Also represents selections when range.0 != range.1.
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///
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/// `range` is a pair of 1d grapheme indexes into the text.
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///
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/// `vis_start` is the visual 2d horizontal position of the cursor. This
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/// doesn't affect editing operations at all, but is used for cursor movement.
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pub struct Cursor {
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pub range: (usize, usize), // start, end
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pub vis_start: usize, // start
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}
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impl Cursor {
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pub fn new() -> Cursor {
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Cursor {
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range: (0, 0),
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vis_start: 0,
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}
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}
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pub fn update_vis_start(&mut self, buf: &Buffer, tab_width: usize) {
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let (v, h) = buf.index_to_line_col(self.range.0);
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self.vis_start = buf.get_line(v).grapheme_index_to_closest_vis_pos(h, tab_width);
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}
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}
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pub struct Editor {
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pub buffer: Buffer,
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pub file_path: Path,
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pub soft_tabs: bool,
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pub tab_width: usize,
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pub dirty: bool,
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// The dimensions and position of the editor's view within the buffer
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pub view_dim: (usize, usize), // (height, width)
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pub view_pos: (usize, usize), // (line, col)
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// The editing cursor position
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pub cursor: Cursor,
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}
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impl Editor {
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/// Create a new blank editor
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pub fn new() -> Editor {
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Editor {
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buffer: Buffer::new(),
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file_path: Path::new(""),
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soft_tabs: false,
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tab_width: 4,
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dirty: false,
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view_dim: (0, 0),
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view_pos: (0, 0),
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cursor: Cursor::new(),
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}
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}
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pub fn new_from_file(path: &Path) -> Editor {
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let buf = load_file_to_buffer(path).unwrap();
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let mut ed = Editor {
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buffer: buf,
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file_path: path.clone(),
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soft_tabs: false,
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tab_width: 4,
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dirty: false,
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view_dim: (0, 0),
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view_pos: (0, 0),
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cursor: Cursor::new(),
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};
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ed.auto_detect_indentation_style();
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return ed;
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}
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pub fn save_if_dirty(&mut self) {
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if self.dirty && self.file_path != Path::new("") {
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let _ = save_buffer_to_file(&self.buffer, &self.file_path);
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self.dirty = false;
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}
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}
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pub fn auto_detect_indentation_style(&mut self) {
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let mut tab_blocks: usize = 0;
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let mut space_blocks: usize = 0;
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let mut space_histogram: [usize; 9] = [0, 0, 0, 0, 0, 0, 0, 0, 0];
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let mut last_indent = (false, 0us); // (was_tabs, indent_count)
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// Collect statistics
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let mut line_i: usize = 0;
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for line in self.buffer.line_iter() {
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let mut g_iter = line.grapheme_iter();
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match g_iter.next() {
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Some("\t") => {
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// Count leading tabs
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let mut count = 1;
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for g in g_iter {
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if g == "\t" {
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count += 1;
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}
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else {
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break;
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}
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}
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// Update stats
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if last_indent.0 && last_indent.1 < count {
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tab_blocks += 1;
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}
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// Store last line info
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last_indent = (true, count);
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},
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Some(" ") => {
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// Count leading spaces
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let mut count = 1;
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for g in g_iter {
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if g == " " {
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count += 1;
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}
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else {
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break;
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}
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}
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// Update stats
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if !last_indent.0 && last_indent.1 < count {
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space_blocks += 1;
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let amount = count - last_indent.1;
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if amount < 9 {
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space_histogram[amount] += 1;
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}
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else {
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space_histogram[8] += 1;
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}
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}
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// Store last line info
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last_indent = (false, count);
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},
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_ => {},
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}
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// Stop after 1000 lines
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line_i += 1;
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if line_i > 1000 {
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break;
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}
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}
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// Analyze stats and make a determination
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if space_blocks == 0 && tab_blocks == 0 {
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return;
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}
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if space_blocks > (tab_blocks * 2) {
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let mut width = 0;
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let mut width_count = 0;
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for i in range(0, 9) {
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if space_histogram[i] > width_count {
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width = i;
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width_count = space_histogram[i];
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}
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}
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self.soft_tabs = true;
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self.tab_width = width;
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}
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else {
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self.soft_tabs = false;
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}
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}
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pub fn update_dim(&mut self, h: usize, w: usize) {
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self.view_dim = (h, w);
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}
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pub fn undo(&mut self) {
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if let Some(pos) = self.buffer.undo() {
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self.cursor.range.0 = pos;
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self.cursor.range.1 = pos;
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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self.move_view_to_cursor();
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}
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}
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pub fn redo(&mut self) {
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if let Some(pos) = self.buffer.redo() {
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self.cursor.range.0 = pos;
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self.cursor.range.1 = pos;
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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self.move_view_to_cursor();
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}
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}
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/// Moves the editor's view the minimum amount to show the cursor
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pub fn move_view_to_cursor(&mut self) {
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let (v, h) = self.buffer.index_to_v2d(self.cursor.range.0, self.tab_width);
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// Horizontal
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if h < self.view_pos.1 {
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self.view_pos.1 = h;
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}
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else if h >= (self.view_pos.1 + self.view_dim.1) {
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self.view_pos.1 = 1 + h - self.view_dim.1;
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}
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// Vertical
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if v < self.view_pos.0 {
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self.view_pos.0 = v;
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}
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else if v >= (self.view_pos.0 + self.view_dim.0) {
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self.view_pos.0 = 1 + v - self.view_dim.0;
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}
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}
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pub fn insert_text_at_cursor(&mut self, text: &str) {
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let str_len = grapheme_count(text);
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// Insert text
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self.buffer.insert_text(text, self.cursor.range.0);
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self.dirty = true;
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// Move cursor
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self.cursor.range.0 += str_len;
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self.cursor.range.1 += str_len;
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn insert_tab_at_cursor(&mut self) {
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if self.soft_tabs {
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// Figure out how many spaces to insert
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let (v, h) = self.buffer.index_to_line_col(self.cursor.range.0);
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let vis_pos = self.buffer.get_line(v).grapheme_index_to_closest_vis_pos(h, self.tab_width);
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let next_tab_stop = ((vis_pos / self.tab_width) + 1) * self.tab_width;
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let space_count = min(next_tab_stop - vis_pos, 8);
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// Insert spaces
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let space_strs = ["", " ", " ", " ", " ", " ", " ", " ", " "];
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self.buffer.insert_text(space_strs[space_count], self.cursor.range.0);
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self.dirty = true;
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// Move cursor
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self.cursor.range.0 += space_count;
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self.cursor.range.1 += space_count;
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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// Adjust view
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self.move_view_to_cursor();
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}
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else {
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self.insert_text_at_cursor("\t");
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}
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}
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pub fn backspace_at_cursor(&mut self) {
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self.remove_text_behind_cursor(1);
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}
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pub fn insert_text_at_grapheme(&mut self, text: &str, pos: usize) {
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self.dirty = true;
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let buf_len = self.buffer.grapheme_count();
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self.buffer.insert_text(text, if pos < buf_len {pos} else {buf_len});
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}
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pub fn remove_text_behind_cursor(&mut self, grapheme_count: usize) {
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let pos_b = self.cursor.range.0;
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let pos_a = if pos_b >= grapheme_count {pos_b - grapheme_count} else {0};
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let tot_g = pos_b - pos_a;
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// Remove text
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self.buffer.remove_text(pos_a, pos_b);
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self.dirty = true;
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// Move cursor
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self.cursor.range.0 -= tot_g;
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self.cursor.range.1 -= tot_g;
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn remove_text_in_front_of_cursor(&mut self, grapheme_count: usize) {
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let pos_a = self.cursor.range.1;
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let pos_b = if (pos_a + grapheme_count) <= self.buffer.grapheme_count() {pos_a + grapheme_count} else {self.buffer.grapheme_count()};
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// Remove text
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self.buffer.remove_text(pos_a, pos_b);
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self.dirty = true;
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// Move cursor
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn remove_text_inside_cursor(&mut self) {
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// If selection, remove text
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if self.cursor.range.0 < self.cursor.range.1 {
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self.buffer.remove_text(self.cursor.range.0, self.cursor.range.1);
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self.dirty = true;
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}
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// Move cursor
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self.cursor.range.1 = self.cursor.range.0;
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn cursor_to_beginning_of_buffer(&mut self) {
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self.cursor.range = (0, 0);
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn cursor_to_end_of_buffer(&mut self) {
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let end = self.buffer.grapheme_count();
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self.cursor.range = (end, end);
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn cursor_left(&mut self, n: usize) {
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if self.cursor.range.0 >= n {
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self.cursor.range.0 -= n;
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}
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else {
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self.cursor.range.0 = 0;
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}
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self.cursor.range.1 = self.cursor.range.0;
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn cursor_right(&mut self, n: usize) {
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if self.cursor.range.1 <= (self.buffer.grapheme_count() - n) {
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self.cursor.range.1 += n;
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}
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else {
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self.cursor.range.1 = self.buffer.grapheme_count();
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}
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self.cursor.range.0 = self.cursor.range.1;
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self.cursor.update_vis_start(&(self.buffer), self.tab_width);
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn cursor_up(&mut self, n: usize) {
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let (v, _) = self.buffer.index_to_v2d(self.cursor.range.0, self.tab_width);
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if v >= n {
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self.cursor.range.0 = self.buffer.v2d_to_index((v - n, self.cursor.vis_start), self.tab_width);
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self.cursor.range.1 = self.cursor.range.0;
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}
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else {
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self.cursor_to_beginning_of_buffer();
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}
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn cursor_down(&mut self, n: usize) {
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let (v, _) = self.buffer.index_to_v2d(self.cursor.range.0, self.tab_width);
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if v < (self.buffer.line_count() - n) {
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self.cursor.range.0 = self.buffer.v2d_to_index((v + n, self.cursor.vis_start), self.tab_width);
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self.cursor.range.1 = self.cursor.range.0;
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}
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else {
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self.cursor_to_end_of_buffer();
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}
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn page_up(&mut self) {
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if self.view_pos.0 > 0 {
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let move_amount = self.view_dim.0 - (self.view_dim.0 / 8);
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if self.view_pos.0 >= move_amount {
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self.view_pos.0 -= move_amount;
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}
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else {
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self.view_pos.0 = 0;
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}
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self.cursor_up(move_amount);
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}
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else {
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self.cursor_to_beginning_of_buffer();
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}
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn page_down(&mut self) {
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// TODO
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let nlc = self.buffer.line_count() - 1;
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if self.view_pos.0 < nlc {
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let move_amount = self.view_dim.0 - (self.view_dim.0 / 8);
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let max_move = nlc - self.view_pos.0;
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if max_move >= move_amount {
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self.view_pos.0 += move_amount;
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}
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else {
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self.view_pos.0 += max_move;
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}
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self.cursor_down(move_amount);
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}
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else {
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self.cursor_to_end_of_buffer();
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}
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// Adjust view
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self.move_view_to_cursor();
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}
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pub fn jump_to_line(&mut self, n: usize) {
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let pos = self.buffer.line_col_to_index((n, 0));
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let (v, _) = self.buffer.index_to_v2d(pos, self.tab_width);
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self.cursor.range.0 = self.buffer.v2d_to_index((v, self.cursor.vis_start), self.tab_width);
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self.cursor.range.1 = self.cursor.range.0;
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// Adjust view
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self.move_view_to_cursor();
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}
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}
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