mirror of
https://github.com/alexpasmantier/television.git
synced 2025-06-06 19:45:23 +00:00
575 lines
16 KiB
Rust
575 lines
16 KiB
Rust
/// Input requests are used to change the input state.
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///
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/// Different backends can be used to convert events into requests.
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#[allow(clippy::module_name_repetitions)]
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#[derive(Debug, PartialOrd, PartialEq, Eq, Clone, Copy, Hash)]
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pub enum InputRequest {
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SetCursor(usize),
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InsertChar(char),
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GoToPrevChar,
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GoToNextChar,
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GoToPrevWord,
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GoToNextWord,
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GoToStart,
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GoToEnd,
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DeletePrevChar,
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DeleteNextChar,
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DeletePrevWord,
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DeleteNextWord,
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DeleteLine,
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DeleteTillEnd,
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}
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#[derive(Debug, PartialOrd, PartialEq, Eq, Clone, Copy, Hash)]
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pub struct StateChanged {
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pub value: bool,
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pub cursor: bool,
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}
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#[allow(clippy::module_name_repetitions)]
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pub type InputResponse = Option<StateChanged>;
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/// An input buffer with cursor support.
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#[derive(Default, Debug, Clone)]
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pub struct Input {
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value: String,
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cursor: usize,
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}
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impl Input {
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/// Initialize a new instance with a given value
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/// Cursor will be set to the given value's length.
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pub fn new(value: String) -> Self {
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let len = value.chars().count();
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Self { value, cursor: len }
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}
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/// Set the value manually.
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/// Cursor will be set to the given value's length.
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pub fn with_value(mut self, value: String) -> Self {
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self.cursor = value.chars().count();
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self.value = value;
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self
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}
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/// Set the cursor manually.
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/// If the input is larger than the value length, it'll be auto adjusted.
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pub fn with_cursor(mut self, cursor: usize) -> Self {
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self.cursor = cursor.min(self.value.chars().count());
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self
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}
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// Reset the cursor and value to default
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pub fn reset(&mut self) {
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self.cursor = Default::default();
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self.value = String::default();
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}
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/// Handle request and emit response.
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#[allow(clippy::too_many_lines)]
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pub fn handle(&mut self, req: InputRequest) -> InputResponse {
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use InputRequest::{
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DeleteLine, DeleteNextChar, DeleteNextWord, DeletePrevChar,
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DeletePrevWord, DeleteTillEnd, GoToEnd, GoToNextChar,
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GoToNextWord, GoToPrevChar, GoToPrevWord, GoToStart, InsertChar,
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SetCursor,
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};
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match req {
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SetCursor(pos) => {
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let pos = pos.min(self.value.chars().count());
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if self.cursor == pos {
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None
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} else {
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self.cursor = pos;
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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}
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}
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InsertChar(c) => {
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if self.cursor == self.value.chars().count() {
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self.value.push(c);
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} else {
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self.value = self
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.value
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.chars()
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.take(self.cursor)
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.chain(
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std::iter::once(c)
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.chain(self.value.chars().skip(self.cursor)),
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)
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.collect();
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}
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self.cursor += 1;
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Some(StateChanged {
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value: true,
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cursor: true,
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})
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}
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DeletePrevChar => {
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if self.cursor == 0 {
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None
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} else {
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self.cursor -= 1;
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self.value = self
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.value
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.chars()
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.enumerate()
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.filter(|(i, _)| i != &self.cursor)
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.map(|(_, c)| c)
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.collect();
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Some(StateChanged {
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value: true,
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cursor: true,
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})
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}
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}
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DeleteNextChar => {
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if self.cursor == self.value.chars().count() {
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None
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} else {
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self.value = self
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.value
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.chars()
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.enumerate()
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.filter(|(i, _)| i != &self.cursor)
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.map(|(_, c)| c)
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.collect();
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Some(StateChanged {
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value: true,
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cursor: false,
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})
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}
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}
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GoToPrevChar => {
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if self.cursor == 0 {
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None
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} else {
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self.cursor -= 1;
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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}
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}
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GoToPrevWord => {
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if self.cursor == 0 {
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None
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} else {
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self.cursor = self
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.value
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.chars()
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.rev()
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.skip(
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self.value.chars().count().max(self.cursor)
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- self.cursor,
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)
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.skip_while(|c| !c.is_alphanumeric())
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.skip_while(|c| c.is_alphanumeric())
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.count();
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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}
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}
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GoToNextChar => {
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if self.cursor == self.value.chars().count() {
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None
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} else {
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self.cursor += 1;
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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}
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}
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GoToNextWord => {
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if self.cursor == self.value.chars().count() {
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None
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} else {
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self.cursor = self
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.value
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.chars()
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.enumerate()
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.skip(self.cursor)
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.skip_while(|(_, c)| c.is_alphanumeric())
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.find(|(_, c)| c.is_alphanumeric())
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.map(|(i, _)| i)
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.unwrap_or_else(|| self.value.chars().count());
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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}
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}
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DeleteLine => {
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if self.value.is_empty() {
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None
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} else {
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let cursor = self.cursor;
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self.value = "".into();
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self.cursor = 0;
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Some(StateChanged {
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value: true,
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cursor: self.cursor == cursor,
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})
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}
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}
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DeletePrevWord => {
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if self.cursor == 0 {
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None
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} else {
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let remaining = self.value.chars().skip(self.cursor);
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let rev = self
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.value
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.chars()
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.rev()
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.skip(
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self.value.chars().count().max(self.cursor)
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- self.cursor,
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)
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.skip_while(|c| !c.is_alphanumeric())
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.skip_while(|c| c.is_alphanumeric())
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.collect::<Vec<char>>();
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let rev_len = rev.len();
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self.value =
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rev.into_iter().rev().chain(remaining).collect();
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self.cursor = rev_len;
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Some(StateChanged {
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value: true,
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cursor: true,
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})
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}
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}
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DeleteNextWord => {
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if self.cursor == self.value.chars().count() {
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None
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} else {
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self.value = self
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.value
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.chars()
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.take(self.cursor)
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.chain(
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self.value
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.chars()
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.skip(self.cursor)
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.skip_while(|c| c.is_alphanumeric())
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.skip_while(|c| !c.is_alphanumeric()),
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)
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.collect();
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Some(StateChanged {
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value: true,
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cursor: false,
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})
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}
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}
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GoToStart => {
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if self.cursor == 0 {
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None
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} else {
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self.cursor = 0;
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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}
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}
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GoToEnd => {
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let count = self.value.chars().count();
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if self.cursor == count {
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None
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} else {
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self.cursor = count;
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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}
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}
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DeleteTillEnd => {
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self.value = self.value.chars().take(self.cursor).collect();
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Some(StateChanged {
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value: true,
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cursor: false,
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})
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}
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}
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}
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/// Get a reference to the current value.
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pub fn value(&self) -> &str {
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self.value.as_str()
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}
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/// Get the correct cursor placement.
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pub fn cursor(&self) -> usize {
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self.cursor
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}
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/// Get the current cursor position with account for multi space characters.
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pub fn visual_cursor(&self) -> usize {
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if self.cursor == 0 {
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return 0;
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}
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// Safe, because the end index will always be within bounds
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unicode_width::UnicodeWidthStr::width(unsafe {
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self.value.get_unchecked(
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0..self
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.value
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.char_indices()
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.nth(self.cursor)
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.map_or_else(|| self.value.len(), |(index, _)| index),
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)
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})
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}
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/// Get the scroll position with account for multi space characters.
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pub fn visual_scroll(&self, width: usize) -> usize {
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let scroll = self.visual_cursor().max(width) - width;
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let mut uscroll = 0;
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let mut chars = self.value().chars();
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while uscroll < scroll {
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match chars.next() {
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Some(c) => {
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uscroll +=
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unicode_width::UnicodeWidthChar::width(c).unwrap_or(0);
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}
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None => break,
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}
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}
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uscroll
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}
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}
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impl From<Input> for String {
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fn from(input: Input) -> Self {
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input.value
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}
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}
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impl From<String> for Input {
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fn from(value: String) -> Self {
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Self::new(value)
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}
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}
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impl From<&str> for Input {
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fn from(value: &str) -> Self {
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Self::new(value.into())
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}
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}
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impl std::fmt::Display for Input {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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self.value.fmt(f)
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}
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}
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#[cfg(test)]
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mod tests {
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const TEXT: &str = "first second, third.";
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use super::*;
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#[test]
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fn format() {
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let input: Input = TEXT.into();
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println!("{}", input);
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println!("{}", input);
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}
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#[test]
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fn set_cursor() {
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let mut input: Input = TEXT.into();
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let req = InputRequest::SetCursor(3);
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let resp = input.handle(req);
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assert_eq!(
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resp,
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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);
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assert_eq!(input.value(), "first second, third.");
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assert_eq!(input.cursor(), 3);
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let req = InputRequest::SetCursor(30);
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let resp = input.handle(req);
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assert_eq!(input.cursor(), TEXT.chars().count());
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assert_eq!(
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resp,
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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);
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let req = InputRequest::SetCursor(TEXT.chars().count());
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let resp = input.handle(req);
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assert_eq!(input.cursor(), TEXT.chars().count());
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assert_eq!(resp, None);
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}
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#[test]
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fn insert_char() {
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let mut input: Input = TEXT.into();
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let req = InputRequest::InsertChar('x');
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let resp = input.handle(req);
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assert_eq!(
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resp,
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Some(StateChanged {
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value: true,
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cursor: true,
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})
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);
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assert_eq!(input.value(), "first second, third.x");
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assert_eq!(input.cursor(), TEXT.chars().count() + 1);
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input.handle(req);
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assert_eq!(input.value(), "first second, third.xx");
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assert_eq!(input.cursor(), TEXT.chars().count() + 2);
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let mut input = input.with_cursor(3);
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input.handle(req);
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assert_eq!(input.value(), "firxst second, third.xx");
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assert_eq!(input.cursor(), 4);
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input.handle(req);
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assert_eq!(input.value(), "firxxst second, third.xx");
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assert_eq!(input.cursor(), 5);
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}
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#[test]
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fn go_to_prev_char() {
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let mut input: Input = TEXT.into();
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let req = InputRequest::GoToPrevChar;
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let resp = input.handle(req);
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assert_eq!(
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resp,
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Some(StateChanged {
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value: false,
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cursor: true,
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})
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);
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assert_eq!(input.value(), "first second, third.");
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assert_eq!(input.cursor(), TEXT.chars().count() - 1);
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let mut input = input.with_cursor(3);
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input.handle(req);
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assert_eq!(input.value(), "first second, third.");
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assert_eq!(input.cursor(), 2);
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input.handle(req);
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assert_eq!(input.value(), "first second, third.");
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assert_eq!(input.cursor(), 1);
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}
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#[test]
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fn remove_unicode_chars() {
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let mut input: Input = "¡test¡".into();
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let req = InputRequest::DeletePrevChar;
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let resp = input.handle(req);
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assert_eq!(
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resp,
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Some(StateChanged {
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value: true,
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cursor: true,
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})
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);
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assert_eq!(input.value(), "¡test");
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assert_eq!(input.cursor(), 5);
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input.handle(InputRequest::GoToStart);
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let req = InputRequest::DeleteNextChar;
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let resp = input.handle(req);
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assert_eq!(
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resp,
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Some(StateChanged {
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value: true,
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cursor: false,
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})
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);
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assert_eq!(input.value(), "test");
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assert_eq!(input.cursor(), 0);
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}
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#[test]
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fn insert_unicode_chars() {
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let mut input = Input::from("¡test¡").with_cursor(5);
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let req = InputRequest::InsertChar('☆');
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let resp = input.handle(req);
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assert_eq!(
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resp,
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Some(StateChanged {
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value: true,
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cursor: true,
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})
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);
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assert_eq!(input.value(), "¡test☆¡");
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assert_eq!(input.cursor(), 6);
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input.handle(InputRequest::GoToStart);
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input.handle(InputRequest::GoToNextChar);
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let req = InputRequest::InsertChar('☆');
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let resp = input.handle(req);
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assert_eq!(
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resp,
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Some(StateChanged {
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value: true,
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cursor: true,
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})
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);
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assert_eq!(input.value(), "¡☆test☆¡");
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assert_eq!(input.cursor(), 2);
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}
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#[test]
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fn multispace_characters() {
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let input: Input = "Ｈｅｌｌｏ, ｗｏｒｌｄ!".into();
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assert_eq!(input.cursor(), 13);
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assert_eq!(input.visual_cursor(), 23);
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assert_eq!(input.visual_scroll(6), 18);
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}
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}
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