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use std::num::NonZeroUsize;
use ecow::EcoString;
use crate::doc::{Destination, Frame, FrameItem, Meta, Position};
use crate::file::FileId;
use crate::geom::{Geometry, Point, Size};
use crate::model::Introspector;
use crate::syntax::{LinkedNode, Source, Span, SyntaxKind};
use crate::World;
/// Where to [jump](jump_from_click) to.
#[derive(Debug, Clone, Eq, PartialEq)]
pub enum Jump {
/// Jump to a position in a source file.
Source(FileId, usize),
/// Jump to an external URL.
Url(EcoString),
/// Jump to a point on a page.
Position(Position),
}
impl Jump {
fn from_span(world: &dyn World, span: Span) -> Option<Self> {
let source = world.source(span.id()).ok()?;
let node = source.find(span)?;
Some(Self::Source(span.id(), node.offset()))
}
}
/// Determine where to jump to based on a click in a frame.
pub fn jump_from_click(
world: &dyn World,
frames: &[Frame],
frame: &Frame,
click: Point,
) -> Option<Jump> {
let mut introspector = None;
// Try to find a link first.
for (pos, item) in frame.items() {
if let FrameItem::Meta(Meta::Link(dest), size) = item {
if is_in_rect(*pos, *size, click) {
return Some(match dest {
Destination::Url(url) => Jump::Url(url.clone()),
Destination::Position(pos) => Jump::Position(*pos),
Destination::Location(loc) => Jump::Position(
introspector
.get_or_insert_with(|| Introspector::new(frames))
.position(*loc),
),
});
}
}
}
// If there's no link, search for a jump target.
for (mut pos, item) in frame.items().rev() {
match item {
FrameItem::Group(group) => {
// TODO: Handle transformation.
if let Some(span) =
jump_from_click(world, frames, &group.frame, click - pos)
{
return Some(span);
}
}
FrameItem::Text(text) => {
for glyph in &text.glyphs {
let (span, span_offset) = glyph.span;
if span.is_detached() {
continue;
}
let width = glyph.x_advance.at(text.size);
if is_in_rect(
Point::new(pos.x, pos.y - text.size),
Size::new(width, text.size),
click,
) {
let source = world.source(span.id()).ok()?;
let node = source.find(span)?;
let pos = if node.kind() == SyntaxKind::Text {
let range = node.range();
let mut offset = range.start + usize::from(span_offset);
if (click.x - pos.x) > width / 2.0 {
offset += glyph.range().len();
}
offset.min(range.end)
} else {
node.offset()
};
return Some(Jump::Source(source.id(), pos));
}
pos.x += width;
}
}
FrameItem::Shape(shape, span) => {
let Geometry::Rect(size) = shape.geometry else { continue };
if is_in_rect(pos, size, click) {
return Jump::from_span(world, *span);
}
}
FrameItem::Image(_, size, span) if is_in_rect(pos, *size, click) => {
return Jump::from_span(world, *span);
}
_ => {}
}
}
None
}
/// Find the output location in the document for a cursor position.
pub fn jump_from_cursor(
frames: &[Frame],
source: &Source,
cursor: usize,
) -> Option<Position> {
let node = LinkedNode::new(source.root()).leaf_at(cursor)?;
if node.kind() != SyntaxKind::Text {
return None;
}
let span = node.span();
for (i, frame) in frames.iter().enumerate() {
if let Some(pos) = find_in_frame(frame, span) {
return Some(Position {
page: NonZeroUsize::new(i + 1).unwrap(),
point: pos,
});
}
}
None
}
/// Find the position of a span in a frame.
fn find_in_frame(frame: &Frame, span: Span) -> Option<Point> {
for (mut pos, item) in frame.items() {
if let FrameItem::Group(group) = item {
// TODO: Handle transformation.
if let Some(point) = find_in_frame(&group.frame, span) {
return Some(point + pos);
}
}
if let FrameItem::Text(text) = item {
for glyph in &text.glyphs {
if glyph.span.0 == span {
return Some(pos);
}
pos.x += glyph.x_advance.at(text.size);
}
}
}
None
}
/// Whether a rectangle with the given size at the given position contains the
/// click position.
fn is_in_rect(pos: Point, size: Size, click: Point) -> bool {
pos.x <= click.x
&& pos.x + size.x >= click.x
&& pos.y <= click.y
&& pos.y + size.y >= click.y
}
|
