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Implement markdown incremental code highlighting

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This commit is contained in:
Héctor Ramón Jiménez 2025-01-31 20:37:07 +01:00
parent 128058ea94
commit 4b8fc23840
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GPG key ID: 7CC46565708259A7
3 changed files with 262 additions and 102 deletions
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81
examples/markdown/src/main.rs
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@ -19,7 +19,7 @@ struct Markdown {
}
enum Mode {
Oneshot(Vec<markdown::Item>),
Preview(Vec<markdown::Item>),
Stream {
pending: String,
parsed: markdown::Content,
@ -43,14 +43,14 @@ impl Markdown {
(
Self {
content: text_editor::Content::with_text(INITIAL_CONTENT),
mode: Mode::Oneshot(markdown::parse(INITIAL_CONTENT).collect()),
mode: Mode::Preview(markdown::parse(INITIAL_CONTENT).collect()),
theme,
},
widget::focus_next(),
)
}
fn update(&mut self, message: Message) {
fn update(&mut self, message: Message) -> Task<Message> {
match message {
Message::Edit(action) => {
let is_edit = action.is_edit();
@ -58,48 +58,57 @@ impl Markdown {
self.content.perform(action);
if is_edit {
self.mode = match self.mode {
Mode::Oneshot(_) => Mode::Oneshot(
markdown::parse(&self.content.text()).collect(),
),
Mode::Stream { .. } => Mode::Stream {
pending: self.content.text(),
parsed: markdown::Content::parse(""),
},
}
self.mode = Mode::Preview(
markdown::parse(&self.content.text()).collect(),
);
}
Task::none()
}
Message::LinkClicked(link) => {
let _ = open::that_in_background(link.to_string());
Task::none()
}
Message::ToggleStream(enable_stream) => {
self.mode = if enable_stream {
Mode::Stream {
if enable_stream {
self.mode = Mode::Stream {
pending: self.content.text(),
parsed: markdown::Content::parse(""),
}
} else {
Mode::Oneshot(
markdown::parse(&self.content.text()).collect(),
};
scrollable::snap_to(
"preview",
scrollable::RelativeOffset::END,
)
};
} else {
self.mode = Mode::Preview(
markdown::parse(&self.content.text()).collect(),
);
Task::none()
}
}
Message::NextToken => match &mut self.mode {
Mode::Oneshot(_) => {}
Mode::Stream { pending, parsed } => {
if pending.is_empty() {
self.mode = Mode::Oneshot(parsed.items().to_vec());
} else {
let mut tokens = pending.split(' ');
Message::NextToken => {
match &mut self.mode {
Mode::Preview(_) => {}
Mode::Stream { pending, parsed } => {
if pending.is_empty() {
self.mode = Mode::Preview(parsed.items().to_vec());
} else {
let mut tokens = pending.split(' ');
if let Some(token) = tokens.next() {
parsed.push_str(&format!("{token} "));
if let Some(token) = tokens.next() {
parsed.push_str(&format!("{token} "));
}
*pending = tokens.collect::<Vec<_>>().join(" ");
}
*pending = tokens.collect::<Vec<_>>().join(" ");
}
}
},
Task::none()
}
}
}
@ -113,7 +122,7 @@ impl Markdown {
.highlight("markdown", highlighter::Theme::Base16Ocean);
let items = match &self.mode {
Mode::Oneshot(items) => items.as_slice(),
Mode::Preview(items) => items.as_slice(),
Mode::Stream { parsed, .. } => parsed.items(),
};
@ -127,7 +136,11 @@ impl Markdown {
row![
editor,
hover(
scrollable(preview).spacing(10).width(Fill).height(Fill),
scrollable(preview)
.spacing(10)
.width(Fill)
.height(Fill)
.id("preview"),
right(
toggler(matches!(self.mode, Mode::Stream { .. }))
.label("Stream")
@ -147,7 +160,7 @@ impl Markdown {
fn subscription(&self) -> Subscription<Message> {
match self.mode {
Mode::Oneshot(_) => Subscription::none(),
Mode::Preview(_) => Subscription::none(),
Mode::Stream { .. } => {
time::every(milliseconds(20)).map(|_| Message::NextToken)
}