Jump to destination

1 files changed, 48 insertions, 26 deletions

diff --git a/src/ide/jump.rs b/src/ide/jump.rs
index 1a96fbbe..8a19c1fd 100644
--- a/src/ide/jump.rs
+++ b/src/ide/jump.rs
@@ -1,17 +1,29 @@
 use std::num::NonZeroUsize;
 
-use crate::doc::{Element, Frame, Location};
-use crate::geom::Point;
-use crate::syntax::{LinkedNode, Source, Span, SyntaxKind};
+use crate::doc::{Destination, Element, Frame, Location, Meta};
+use crate::geom::{Point, Size};
+use crate::syntax::{LinkedNode, Source, SourceId, Span, SyntaxKind};
 use crate::World;
 
-/// Find the source file and byte offset for a click position.
-pub fn jump_to_source<'a>(
-    world: &'a dyn World,
-    frame: &Frame,
-    click: Point,
-) -> Option<(&'a Source, usize)> {
+/// Where to [jump](jump_from_click) to.
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum Jump {
+    /// Jump to a position in a source file.
+    Source(SourceId, usize),
+    /// Jump to position in the output or to an external URL.
+    Dest(Destination),
+}
+
+/// Determine where to jump to based on a click in a frame.
+pub fn jump_from_click(world: &dyn World, frame: &Frame, click: Point) -> Option<Jump> {
     for (mut pos, element) in frame.elements() {
+        if let Element::Group(group) = element {
+            // TODO: Handle transformation.
+            if let Some(span) = jump_from_click(world, &group.frame, click - pos) {
+                return Some(span);
+            }
+        }
+
         if let Element::Text(text) = element {
             for glyph in &text.glyphs {
                 if glyph.span.is_detached() {
@@ -19,11 +31,11 @@ pub fn jump_to_source<'a>(
                 }
 
                 let width = glyph.x_advance.at(text.size);
-                if pos.x <= click.x
-                    && pos.x + width >= click.x
-                    && pos.y >= click.y
-                    && pos.y - text.size <= click.y
-                {
+                if is_in_rect(
+                    Point::new(pos.x, pos.y - text.size),
+                    Size::new(width, text.size),
+                    click,
+                ) {
                     let source = world.source(glyph.span.source());
                     let node = source.find(glyph.span);
                     let pos = if node.kind() == SyntaxKind::Text {
@@ -32,16 +44,16 @@ pub fn jump_to_source<'a>(
                     } else {
                         node.offset()
                     };
-                    return Some((source, pos));
+                    return Some(Jump::Source(source.id(), pos));
                 }
 
                 pos.x += width;
             }
         }
 
-        if let Element::Group(group) = element {
-            if let Some(span) = jump_to_source(world, &group.frame, click - pos) {
-                return Some(span);
+        if let Element::Meta(Meta::Link(dest), size) = element {
+            if is_in_rect(pos, *size, click) {
+                return Some(Jump::Dest(dest.clone()));
             }
         }
     }
@@ -49,8 +61,8 @@ pub fn jump_to_source<'a>(
     None
 }
 
-/// Find the output location for a cursor position.
-pub fn jump_to_preview(
+/// Find the output location in the document for a cursor position.
+pub fn jump_from_cursor(
     frames: &[Frame],
     source: &Source,
     cursor: usize,
@@ -73,6 +85,13 @@ pub fn jump_to_preview(
 /// Find the position of a span in a frame.
 fn find_in_frame(frame: &Frame, span: Span) -> Option<Point> {
     for (mut pos, element) in frame.elements() {
+        if let Element::Group(group) = element {
+            // TODO: Handle transformation.
+            if let Some(point) = find_in_frame(&group.frame, span) {
+                return Some(point + pos);
+            }
+        }
+
         if let Element::Text(text) = element {
             for glyph in &text.glyphs {
                 if glyph.span == span {
@@ -81,13 +100,16 @@ fn find_in_frame(frame: &Frame, span: Span) -> Option<Point> {
                 pos.x += glyph.x_advance.at(text.size);
             }
         }
-
-        if let Element::Group(group) = element {
-            if let Some(point) = find_in_frame(&group.frame, span) {
-                return Some(point + pos);
-            }
-        }
     }
 
     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
+}