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//! Source mode and the switch between it and blocks.
use super::*;
impl Editor {
/// The document as markdown — normalized, because that is the form that
/// survives being read back. In [`Mode::Source`] it is the text being
/// edited, exactly as it stands.
pub fn source(&self) -> String {
match self.mode {
Mode::Blocks => {
let mut doc = self.doc.clone();
doc.normalize_with(&self.marks);
markdown::serialize_with(&doc, &self.marks)
}
Mode::Source => self.source_text().to_string(),
}
}
/// Which form the document is being edited in.
pub fn mode(&self) -> Mode {
self.mode
}
/// What a toolbar needs to light itself. See [`Formatting`].
pub fn formatting(&self) -> Formatting {
let at = self.cursor();
let marks = if self.blocks() {
let mut marks = self.doc.marks(self.selection);
// A stored mark is one cmd-B has already taken and nothing has
// spent yet, so the button that took it stays lit.
for mark in &self.stored {
if !marks.contains(mark) {
marks.push(mark.clone());
}
}
marks
} else {
Vec::new()
};
Formatting {
mode: self.mode,
marks,
block: self
.doc
.blocks
.get(at.block)
.and_then(|block| crate::slash::label(&block.kind)),
fenceable: self.blocks() && fenceable(&self.doc, self.selection),
}
}
/// Switch between the document and its markdown, carrying the caret across.
///
/// One undo step, and one the history knows the mode of: stepping back
/// over a switch puts the document back in the form it was edited in.
///
/// Anchors cross with it, into the coordinates of the form switched to. One
/// with an end that cannot be placed there comes out detached.
pub fn set_mode(&mut self, mode: Mode, cx: &mut Context<Self>) {
if mode == self.mode {
return;
}
self.history.record(
EditKind::Structure,
self.mode,
&self.doc,
self.selection,
&self.anchors,
);
self.dismiss_menus();
self.switch(mode);
self.history.landed(EditKind::Structure, self.selection);
self.reveal = true;
self.caret_moved();
cx.emit(EditorEvent::ModeChanged(mode));
cx.emit(EditorEvent::Changed);
cx.notify();
}
/// Turn the document into the other form, caret and all. The half of
/// [`Self::set_mode`] that [`Self::with_mode`] needs without a window.
pub(super) fn switch(&mut self, mode: Mode) {
match mode {
Mode::Source => {
let ends = self.anchor_ends();
let mut at = vec![self.cursor()];
at.extend(ends.iter().flat_map(|(start, end)| [*start, *end]));
let (source, offsets) = markdown::serialize_at_many(&self.doc, &at, &self.marks);
self.doc = source_doc(&source);
let place =
|ix: usize| offsets[ix].map(|offset| Cursor::new(0, Part::Code, offset));
let caret = place(0).unwrap_or(Cursor::new(0, Part::Code, source.len()));
self.selection = Selection::at(caret);
self.place_anchors(|ix| place(ix + 1));
}
Mode::Blocks => {
let ends = self.anchor_ends();
let mut offsets = vec![self.cursor().offset];
offsets.extend(
ends.iter()
.flat_map(|(start, end)| [start.offset, end.offset]),
);
let (doc, at) = markdown::parse_at_many(self.source_text(), &offsets, &self.marks);
self.doc = doc;
ensure_block(&mut self.doc);
let place = |ix: usize| at[ix].map(|at: Cursor| at.clamp(&self.doc));
let caret = place(0).unwrap_or_else(|| Cursor::default().clamp(&self.doc));
self.selection = Selection::at(caret);
let ends: Vec<_> = (1..at.len()).map(place).collect();
self.place_anchors(|ix| ends[ix]);
}
}
self.mode = mode;
}
/// [`Mode::Source`] if the document is in blocks, and back again — what a
/// toggle in the app's own chrome calls.
pub fn toggle_source(&mut self, cx: &mut Context<Self>) {
self.set_mode(
match self.mode {
Mode::Blocks => Mode::Source,
Mode::Source => Mode::Blocks,
},
cx,
);
}
/// Whether the document is the thing being edited, rather than its source.
///
/// Every operation that acts on *blocks* asks this: in source mode there is
/// one block, it is a fence holding a string, and turning it into a heading
/// or dragging it somewhere would edit the markup rather than the document
/// the markup spells.
pub(super) fn blocks(&self) -> bool {
self.mode == Mode::Blocks
}
/// The text of the fence the source is held in — what is being edited in
/// [`Mode::Source`]. Only meaningful there; in [`Mode::Blocks`] the
/// document is the truth and this is whatever block zero happens to be.
pub(super) fn source_text(&self) -> &str {
self.doc
.blocks
.first()
.and_then(|block| block.text_at(Part::Code))
.map_or("", |text| text.text.as_str())
}
/// Put the source back in the one fence it is edited as.
///
/// Backspace at the start of an empty fence is a merge, and a merge with
/// nothing above it leaves a paragraph — a block the source view does not
/// paint and the caret would be stranded in. The text survives either way,
/// so this is a change of container and never of content.
pub(super) fn ensure_source(&mut self) {
if self.doc.blocks.len() == 1 && matches!(self.doc.blocks[0].kind, BlockKind::Code { .. }) {
return;
}
let source = self
.doc
.blocks
.iter()
.filter_map(|block| block.text_at(*block.parts().first()?))
.map(|text| text.text.clone())
.collect::<Vec<_>>()
.join("\n");
let offset = self.selection.head.offset.min(source.len());
self.doc = source_doc(&source);
self.selection = Selection::at(Cursor::new(0, Part::Code, offset));
for anchor in &mut self.anchors {
anchor.range = anchor.range.clamp(&self.doc);
}
}
/// Each anchor's ends, in document order.
fn anchor_ends(&self) -> Vec<(Cursor, Cursor)> {
self.anchors
.iter()
.map(|anchor| anchor.range.ordered())
.collect()
}
/// Put each anchor at the ends `place` gives for it, indexed as
/// [`Self::anchor_ends`] flattened: start, end, start, end. An anchor with
/// an end `place` cannot give collapses onto the other, detached.
fn place_anchors(&mut self, place: impl Fn(usize) -> Option<Cursor>) {
for (ix, anchor) in self.anchors.iter_mut().enumerate() {
anchor.range = match (place(2 * ix), place(2 * ix + 1)) {
(Some(start), Some(end)) => Selection::new(start, end),
(surviving, other) => Selection::at(surviving.or(other).unwrap_or_default()),
};
}
}
/// Shut everything floating. A switch of mode is a new document as far as
/// a menu anchored to a block is concerned.
pub(super) fn dismiss_menus(&mut self) {
self.slash = None;
self.pasted = None;
self.url_prompt = None;
self.hovered = None;
self.lifted = None;
self.table_drag = None;
self.dropping = None;
}
}