664 lines
21 KiB
Rust
664 lines
21 KiB
Rust
#![allow(dead_code)]
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use buffer::Buffer;
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use formatter::LineFormatter;
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use formatter::RoundingBehavior::*;
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use std::path::{Path, PathBuf};
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use std::cmp::{min, max};
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use string_utils::{grapheme_count, str_to_line_ending, LineEnding};
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use utils::digit_count;
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use self::cursor::CursorSet;
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mod cursor;
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pub struct Editor<T: LineFormatter> {
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pub buffer: Buffer,
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pub formatter: T,
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pub file_path: PathBuf,
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pub line_ending_type: LineEnding,
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pub soft_tabs: bool,
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pub soft_tab_width: u8,
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pub dirty: bool,
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// The dimensions of the total editor in screen space, including the
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// header, gutter, etc.
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pub editor_dim: (usize, usize),
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// The dimensions and position of just the text view portion of the editor
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pub view_dim: (usize, usize), // (height, width)
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pub view_pos: (usize, usize), // (grapheme index, visual horizontal offset)
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// The editing cursor position
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pub cursors: CursorSet,
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}
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impl<T: LineFormatter> Editor<T> {
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/// Create a new blank editor
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pub fn new(formatter: T) -> Editor<T> {
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Editor {
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buffer: Buffer::new(),
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formatter: formatter,
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file_path: PathBuf::new(""),
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line_ending_type: LineEnding::LF,
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soft_tabs: false,
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soft_tab_width: 4,
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dirty: false,
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editor_dim: (0, 0),
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view_dim: (0, 0),
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view_pos: (0, 0),
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cursors: CursorSet::new(),
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}
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}
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pub fn new_from_file(formatter: T, path: &Path) -> Editor<T> {
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let buf = match Buffer::new_from_file(path) {
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Ok(b) => {b},
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// TODO: handle un-openable file better
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_ => panic!("Could not open file!"),
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};
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let mut ed = Editor {
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buffer: buf,
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formatter: formatter,
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file_path: path.to_path_buf(),
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line_ending_type: LineEnding::LF,
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soft_tabs: false,
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soft_tab_width: 4,
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dirty: false,
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editor_dim: (0, 0),
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view_dim: (0, 0),
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view_pos: (0, 0),
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cursors: CursorSet::new(),
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};
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// For multiple-cursor testing
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//let mut cur = Cursor::new();
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//cur.range.0 = 30;
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//cur.range.1 = 30;
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//cur.update_vis_start(&(ed.buffer), &(ed.formatter));
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//ed.cursors.add_cursor(cur);
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ed.auto_detect_line_ending();
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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 != PathBuf::new("") {
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let _ = self.buffer.save_to_file(&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_line_ending(&mut self) {
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let mut line_ending_histogram: [usize; 8] = [0, 0, 0, 0, 0, 0, 0, 0];
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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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// Get the line ending
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let ending = if line.grapheme_count() > 0 {
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let g = line.grapheme_at_index(line.grapheme_count() - 1);
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str_to_line_ending(g)
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}
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else {
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LineEnding::None
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};
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// Record which line ending it is
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match ending {
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LineEnding::None => {
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},
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LineEnding::CRLF => {
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line_ending_histogram[0] += 1;
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},
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LineEnding::LF => {
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line_ending_histogram[1] += 1;
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},
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LineEnding::VT => {
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line_ending_histogram[2] += 1;
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},
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LineEnding::FF => {
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line_ending_histogram[3] += 1;
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},
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LineEnding::CR => {
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line_ending_histogram[4] += 1;
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},
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LineEnding::NEL => {
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line_ending_histogram[5] += 1;
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},
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LineEnding::LS => {
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line_ending_histogram[6] += 1;
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},
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LineEnding::PS => {
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line_ending_histogram[7] += 1;
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},
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}
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// Stop after 100 lines
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line_i += 1;
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if line_i > 100 {
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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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let mut lei = 0;
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let mut le_count = 0;
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for i in 0usize..8 {
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if line_ending_histogram[i] >= le_count {
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lei = i;
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le_count = line_ending_histogram[i];
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}
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}
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if le_count > 0 {
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self.line_ending_type = match lei {
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0 => LineEnding::CRLF,
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1 => LineEnding::LF,
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2 => LineEnding::VT,
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3 => LineEnding::FF,
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4 => LineEnding::CR,
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5 => LineEnding::NEL,
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6 => LineEnding::LS,
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7 => LineEnding::PS,
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_ => LineEnding::LF,
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};
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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, 0usize); // (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 0usize..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.soft_tab_width = width as u8;
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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.editor_dim = (h, w);
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self.update_view_dim();
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}
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pub fn update_view_dim(&mut self) {
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// TODO: generalize for non-terminal UI. Maybe this isn't where it
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// belongs, in fact. But for now, this is the easiest place to put
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// it.
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let line_count_digits = digit_count(self.buffer.line_count() as u32, 10) as usize;
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// Minus 1 vertically for the header, minus one more than the digits in
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// the line count for the gutter.
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self.view_dim = (self.editor_dim.0 - 1, self.editor_dim.1 - line_count_digits - 1);
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}
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pub fn undo(&mut self) {
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// TODO: handle multiple cursors properly
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if let Some(pos) = self.buffer.undo() {
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self.cursors.truncate(1);
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self.cursors[0].range.0 = pos;
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self.cursors[0].range.1 = pos;
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self.cursors[0].update_vis_start(&(self.buffer), &(self.formatter));
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self.move_view_to_cursor();
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self.dirty = true;
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self.cursors.make_consistent();
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}
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}
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pub fn redo(&mut self) {
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// TODO: handle multiple cursors properly
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if let Some(pos) = self.buffer.redo() {
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self.cursors.truncate(1);
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self.cursors[0].range.0 = pos;
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self.cursors[0].range.1 = pos;
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self.cursors[0].update_vis_start(&(self.buffer), &(self.formatter));
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self.move_view_to_cursor();
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self.dirty = true;
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self.cursors.make_consistent();
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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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// TODO: account for the horizontal offset of the editor view.
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// TODO: handle multiple cursors properly. Should only move if
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// there are no cursors currently in view, and should jump to
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// the closest cursor.
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// Find the first and last grapheme index visible within the editor.
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let g_first = self.formatter.index_set_horizontal_v2d(&self.buffer, self.view_pos.0, 0, Floor);
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let mut g_last = self.formatter.index_offset_vertical_v2d(&self.buffer, g_first, self.view_dim.0 as isize, (Floor, Floor));
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g_last = self.formatter.index_set_horizontal_v2d(&self.buffer, g_last, self.view_dim.1, Floor);
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// Adjust the view depending on where the cursor is
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if self.cursors[0].range.0 < g_first {
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self.view_pos.0 = self.cursors[0].range.0;
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}
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else if self.cursors[0].range.0 > g_last {
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self.view_pos.0 = self.formatter.index_offset_vertical_v2d(&self.buffer, self.cursors[0].range.0, -(self.view_dim.0 as isize), (Floor, Floor));
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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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self.cursors.make_consistent();
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let str_len = grapheme_count(text);
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let mut offset = 0;
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for c in self.cursors.iter_mut() {
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// Insert text
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self.buffer.insert_text(text, c.range.0 + offset);
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self.dirty = true;
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// Move cursor
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c.range.0 += str_len + offset;
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c.range.1 += str_len + offset;
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c.update_vis_start(&(self.buffer), &(self.formatter));
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// Update offset
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offset += str_len;
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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 insert_tab_at_cursor(&mut self) {
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self.cursors.make_consistent();
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if self.soft_tabs {
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let mut offset = 0;
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for c in self.cursors.iter_mut() {
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// Update cursor with offset
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c.range.0 += offset;
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c.range.1 += offset;
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// Figure out how many spaces to insert
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let vis_pos = self.formatter.index_to_horizontal_v2d(&self.buffer, c.range.0);
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// TODO: handle tab settings
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let next_tab_stop = ((vis_pos / self.soft_tab_width as usize) + 1) * self.soft_tab_width as usize;
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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], c.range.0);
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self.dirty = true;
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// Move cursor
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c.range.0 += space_count;
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c.range.1 += space_count;
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c.update_vis_start(&(self.buffer), &(self.formatter));
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// Update offset
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offset += space_count;
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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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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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self.cursors.make_consistent();
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let mut offset = 0;
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for c in self.cursors.iter_mut() {
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// Update cursor with offset
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c.range.0 -= offset;
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c.range.1 -= offset;
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// Do nothing if there's nothing to delete.
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if c.range.0 == 0 {
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continue;
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}
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let len = min(c.range.0, grapheme_count);
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// Remove text
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self.buffer.remove_text_before(c.range.0, len);
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self.dirty = true;
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// Move cursor
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c.range.0 -= len;
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c.range.1 -= len;
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c.update_vis_start(&(self.buffer), &(self.formatter));
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// Update offset
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offset += len;
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}
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self.cursors.make_consistent();
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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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self.cursors.make_consistent();
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let mut offset = 0;
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for c in self.cursors.iter_mut() {
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// Update cursor with offset
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c.range.0 -= min(c.range.0, offset);
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c.range.1 -= min(c.range.1, offset);
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// Do nothing if there's nothing to delete.
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if c.range.1 == self.buffer.grapheme_count() {
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return;
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}
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let max_len = if self.buffer.grapheme_count() > c.range.1 {self.buffer.grapheme_count() - c.range.1} else {0};
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let len = min(max_len, grapheme_count);
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// Remove text
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self.buffer.remove_text_after(c.range.1, len);
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self.dirty = true;
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// Move cursor
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c.update_vis_start(&(self.buffer), &(self.formatter));
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// Update offset
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offset += len;
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}
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self.cursors.make_consistent();
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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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self.cursors.make_consistent();
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let mut offset = 0;
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for c in self.cursors.iter_mut() {
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// Update cursor with offset
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c.range.0 -= min(c.range.0, offset);
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c.range.1 -= min(c.range.1, offset);
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// If selection, remove text
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if c.range.0 < c.range.1 {
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let len = c.range.1 - c.range.0;
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self.buffer.remove_text_before(c.range.0, c.range.1 - c.range.0);
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self.dirty = true;
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// Move cursor
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c.range.1 = c.range.0;
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// Update offset
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offset += len;
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}
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c.update_vis_start(&(self.buffer), &(self.formatter));
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}
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self.cursors.make_consistent();
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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.cursors = CursorSet::new();
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self.cursors[0].range = (0, 0);
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self.cursors[0].update_vis_start(&(self.buffer), &(self.formatter));
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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.cursors = CursorSet::new();
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self.cursors[0].range = (end, end);
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self.cursors[0].update_vis_start(&(self.buffer), &(self.formatter));
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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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for c in self.cursors.iter_mut() {
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if c.range.0 >= n {
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c.range.0 -= n;
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}
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else {
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c.range.0 = 0;
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}
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c.range.1 = c.range.0;
|
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c.update_vis_start(&(self.buffer), &(self.formatter));
|
|
}
|
|
|
|
// Adjust view
|
|
self.move_view_to_cursor();
|
|
}
|
|
|
|
|
|
pub fn cursor_right(&mut self, n: usize) {
|
|
for c in self.cursors.iter_mut() {
|
|
c.range.1 += n;
|
|
|
|
if c.range.1 > self.buffer.grapheme_count() {
|
|
c.range.1 = self.buffer.grapheme_count();
|
|
}
|
|
|
|
c.range.0 = c.range.1;
|
|
c.update_vis_start(&(self.buffer), &(self.formatter));
|
|
}
|
|
|
|
// Adjust view
|
|
self.move_view_to_cursor();
|
|
}
|
|
|
|
|
|
pub fn cursor_up(&mut self, n: usize) {
|
|
for c in self.cursors.iter_mut() {
|
|
let vmove = -1 * (n * self.formatter.single_line_height()) as isize;
|
|
let mut temp_index = self.formatter.index_offset_vertical_v2d(&self.buffer, c.range.0, vmove, (Round, Round));
|
|
|
|
if temp_index == 0 {
|
|
c.update_vis_start(&(self.buffer), &(self.formatter));
|
|
}
|
|
else {
|
|
temp_index = self.formatter.index_set_horizontal_v2d(&self.buffer, temp_index, c.vis_start, Round);
|
|
}
|
|
|
|
c.range.0 = temp_index;
|
|
c.range.1 = temp_index;
|
|
}
|
|
|
|
// Adjust view
|
|
self.move_view_to_cursor();
|
|
}
|
|
|
|
|
|
pub fn cursor_down(&mut self, n: usize) {
|
|
for c in self.cursors.iter_mut() {
|
|
let vmove = (n * self.formatter.single_line_height()) as isize;
|
|
let mut temp_index = self.formatter.index_offset_vertical_v2d(&self.buffer, c.range.0, vmove, (Round, Round));
|
|
|
|
if temp_index == self.buffer.grapheme_count() {
|
|
c.update_vis_start(&(self.buffer), &(self.formatter));
|
|
}
|
|
else {
|
|
temp_index = self.formatter.index_set_horizontal_v2d(&self.buffer, temp_index, c.vis_start, Round);
|
|
}
|
|
|
|
c.range.0 = temp_index;
|
|
c.range.1 = temp_index;
|
|
}
|
|
|
|
// Adjust view
|
|
self.move_view_to_cursor();
|
|
}
|
|
|
|
|
|
pub fn page_up(&mut self) {
|
|
let move_amount = self.view_dim.0 - max((self.view_dim.0 / 8), self.formatter.single_line_height());
|
|
self.view_pos.0 = self.formatter.index_offset_vertical_v2d(&self.buffer, self.view_pos.0, -1 * move_amount as isize, (Round, Round));
|
|
|
|
self.cursor_up(move_amount);
|
|
|
|
// Adjust view
|
|
self.move_view_to_cursor();
|
|
}
|
|
|
|
|
|
pub fn page_down(&mut self) {
|
|
let move_amount = self.view_dim.0 - max((self.view_dim.0 / 8), self.formatter.single_line_height());
|
|
self.view_pos.0 = self.formatter.index_offset_vertical_v2d(&self.buffer, self.view_pos.0, move_amount as isize, (Round, Round));
|
|
|
|
self.cursor_down(move_amount);
|
|
|
|
// Adjust view
|
|
self.move_view_to_cursor();
|
|
}
|
|
|
|
|
|
pub fn jump_to_line(&mut self, n: usize) {
|
|
let pos = self.buffer.line_col_to_index((n, 0));
|
|
self.cursors.truncate(1);
|
|
self.cursors[0].range.0 = self.formatter.index_set_horizontal_v2d(&self.buffer, pos, self.cursors[0].vis_start, Round);
|
|
self.cursors[0].range.1 = self.cursors[0].range.0;
|
|
|
|
// Adjust view
|
|
self.move_view_to_cursor();
|
|
}
|
|
}
|