270 lines
8.1 KiB
Rust
270 lines
8.1 KiB
Rust
use gpui::{Context, EntityInputHandler, SharedString, Window};
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use ropey::RopeSlice;
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use crate::input::mode::InputMode;
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use crate::input::{Indent, IndentInline, InputState, Outdent, OutdentInline};
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#[derive(Debug, Copy, Clone)]
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pub struct TabSize {
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/// Default is 2
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pub tab_size: usize,
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/// Set true to use `\t` as tab indent, default is false
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pub hard_tabs: bool,
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}
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impl Default for TabSize {
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fn default() -> Self {
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Self {
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tab_size: 2,
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hard_tabs: false,
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}
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}
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}
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impl TabSize {
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pub(super) fn to_string(self) -> SharedString {
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if self.hard_tabs {
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"\t".into()
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} else {
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" ".repeat(self.tab_size).into()
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}
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}
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/// Count the indent size of the line in spaces.
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pub fn indent_count(&self, line: &RopeSlice) -> usize {
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let mut count = 0;
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for ch in line.chars() {
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match ch {
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'\t' => count += self.tab_size,
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' ' => count += 1,
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_ => break,
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}
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}
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count
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}
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}
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impl InputState {
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/// Set the tab size for the input.
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///
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/// Only for [`InputMode::PlainText`] mode with multi_line.
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pub fn tab_size(mut self, tab: TabSize) -> Self {
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debug_assert!(self.mode.is_multi_line());
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if let InputMode::PlainText { tab: t, .. } = &mut self.mode {
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*t = tab;
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}
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self
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}
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pub(super) fn indent_inline(
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&mut self,
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_: &IndentInline,
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window: &mut Window,
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cx: &mut Context<Self>,
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) {
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self.indent(false, window, cx);
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}
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pub(super) fn indent_block(&mut self, _: &Indent, window: &mut Window, cx: &mut Context<Self>) {
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self.indent(true, window, cx);
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}
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pub(super) fn outdent_inline(
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&mut self,
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_: &OutdentInline,
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window: &mut Window,
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cx: &mut Context<Self>,
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) {
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self.outdent(false, window, cx);
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}
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pub(super) fn outdent_block(
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&mut self,
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_: &Outdent,
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window: &mut Window,
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cx: &mut Context<Self>,
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) {
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self.outdent(true, window, cx);
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}
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pub(super) fn indent(&mut self, block: bool, window: &mut Window, cx: &mut Context<Self>) {
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if !self.mode.is_indentable() {
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cx.propagate();
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return;
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};
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let tab_indent = self.mode.tab_size().to_string();
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let selected_range = self.selected_range;
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let mut added_len = 0;
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let is_selected = !self.selected_range.is_empty();
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if is_selected || block {
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let start_offset = self.start_of_line_of_selection(window, cx);
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let mut offset = start_offset;
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let selected_text = self
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.text_for_range(
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self.range_to_utf16(&(offset..selected_range.end)),
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&mut None,
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window,
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cx,
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)
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.unwrap_or("".into());
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for line in selected_text.split('\n') {
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self.replace_text_in_range_silent(
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Some(self.range_to_utf16(&(offset..offset))),
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&tab_indent,
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window,
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cx,
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);
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added_len += tab_indent.len();
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// +1 for "\n", the `\r` is included in the `line`.
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offset += line.len() + tab_indent.len() + 1;
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}
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if is_selected {
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self.selected_range = (start_offset..selected_range.end + added_len).into();
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} else {
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self.selected_range =
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(selected_range.start + added_len..selected_range.end + added_len).into();
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}
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} else {
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// Selected none
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let offset = self.selected_range.start;
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self.replace_text_in_range_silent(
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Some(self.range_to_utf16(&(offset..offset))),
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&tab_indent,
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window,
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cx,
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);
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added_len = tab_indent.len();
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self.selected_range =
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(selected_range.start + added_len..selected_range.end + added_len).into();
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}
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}
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pub(super) fn outdent(&mut self, block: bool, window: &mut Window, cx: &mut Context<Self>) {
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if !self.mode.is_indentable() {
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cx.propagate();
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return;
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};
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let tab_indent = self.mode.tab_size().to_string();
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let selected_range = self.selected_range;
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let mut removed_len = 0;
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let is_selected = !self.selected_range.is_empty();
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if is_selected || block {
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let start_offset = self.start_of_line_of_selection(window, cx);
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let mut offset = start_offset;
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let selected_text = self
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.text_for_range(
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self.range_to_utf16(&(offset..selected_range.end)),
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&mut None,
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window,
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cx,
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)
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.unwrap_or("".into());
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for line in selected_text.split('\n') {
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if line.starts_with(tab_indent.as_ref()) {
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self.replace_text_in_range_silent(
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Some(self.range_to_utf16(&(offset..offset + tab_indent.len()))),
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"",
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window,
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cx,
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);
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removed_len += tab_indent.len();
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// +1 for "\n"
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offset += line.len().saturating_sub(tab_indent.len()) + 1;
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} else {
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offset += line.len() + 1;
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}
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}
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if is_selected {
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self.selected_range =
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(start_offset..selected_range.end.saturating_sub(removed_len)).into();
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} else {
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self.selected_range = (selected_range.start.saturating_sub(removed_len)
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..selected_range.end.saturating_sub(removed_len))
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.into();
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}
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} else {
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// Selected none
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let start_offset = self.selected_range.start;
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let offset = self.start_of_line_of_selection(window, cx);
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let offset = self.offset_from_utf16(self.offset_to_utf16(offset));
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// FIXME: To improve performance
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if self
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.text
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.slice(offset..self.text.len())
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.to_string()
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.starts_with(tab_indent.as_ref())
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{
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self.replace_text_in_range_silent(
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Some(self.range_to_utf16(&(offset..offset + tab_indent.len()))),
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"",
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window,
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cx,
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);
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removed_len = tab_indent.len();
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let new_offset = start_offset.saturating_sub(removed_len);
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self.selected_range = (new_offset..new_offset).into();
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}
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use ropey::RopeSlice;
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use super::TabSize;
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#[test]
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fn test_tab_size() {
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let tab = TabSize {
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tab_size: 2,
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hard_tabs: false,
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};
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assert_eq!(tab.to_string(), " ");
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let tab = TabSize {
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tab_size: 4,
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hard_tabs: false,
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};
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assert_eq!(tab.to_string(), " ");
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let tab = TabSize {
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tab_size: 2,
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hard_tabs: true,
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};
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assert_eq!(tab.to_string(), "\t");
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let tab = TabSize {
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tab_size: 4,
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hard_tabs: true,
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};
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assert_eq!(tab.to_string(), "\t");
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}
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#[test]
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fn test_tab_size_indent_count() {
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let tab = TabSize {
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tab_size: 4,
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hard_tabs: false,
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};
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assert_eq!(tab.indent_count(&RopeSlice::from("abc")), 0);
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assert_eq!(tab.indent_count(&RopeSlice::from(" abc")), 2);
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assert_eq!(tab.indent_count(&RopeSlice::from(" abc")), 4);
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assert_eq!(tab.indent_count(&RopeSlice::from("\tabc")), 4);
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assert_eq!(tab.indent_count(&RopeSlice::from(" \tabc")), 6);
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assert_eq!(tab.indent_count(&RopeSlice::from(" \t abc ")), 6);
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assert_eq!(tab.indent_count(&RopeSlice::from("abc")), 0);
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}
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}
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