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Robustness: VectorCraft never crashes — no panics in shipped code

Browse Source 
Shipped code no longer unwraps, expects or panics: every one of the 124
unwrap()/expect()/panic!/unreachable! sites outside tests now handles the
failure (Result/Option, ?, let-else, defaults) and reports errors to the user.

- Lints: workspace clippy denies unwrap_used, expect_used, panic, todo,
  unimplemented and unreachable; clippy.toml allows them in tests, and
  integration tests, examples and testkit opt out explicitly.
- Safety net (vectorcraft_engine::guard): a panic in a top-level command rolls
  the document back and returns EngineError::Internal; a panicking tool is
  reset; the MCP server answers with an internal error and keeps serving; the
  UI frame and each control request are guarded.
- APIs that hid failures now return them: Rendered::to_png/to_jpeg/to_webp
  return Result (JPEG/WebP errors used to write empty files),
  FontDb::face returns Option, Region::top returns Option.
- Fuzzing: engine/tests/import_fuzz.rs feeds garbage, hostile and mutated SVG
  and PDF through import → render → export (30k cases locally, no panics).
- Docs: AGENTS.md/CLAUDE.md rule, docs/development.md "Robustness" section,
  README pointer and a PR template checklist.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Brandon Thomas
2026-10-05 06:28:59 +07:00
committed by bflatastic
co-authored by Claude Opus 5.5
parent 0f241aac9f
commit 3e323bfa2a
89 changed files with 1041 additions and 303 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/engine/src/cmd/brushsym.rs
+7 -6
View File
@@ -248,11 +248,12 @@ fn brush_apply(s: &mut Session, p: &Value) -> Result<Value> {
if n.appearance.stroke().is_none_or(|st| st.paint.is_none()) {
n.appearance.set_stroke(stroke.clone());
}
let st = n.appearance.stroke_mut().expect("stroke");
if st.width <= 0.0 {
st.width = 1.0;
if let Some(st) = n.appearance.stroke_mut() {
if st.width <= 0.0 {
st.width = 1.0;
}
st.brush = Some(name.clone());
}
st.brush = Some(name.clone());
}
Ok(())
})?;
@@ -515,7 +516,7 @@ fn unique_symbol_name(d: &Document, base: &str) -> String {
if !taken(base) {
return base.to_string();
}
(2..).map(|i| format!("{base} {i}")).find(|n| !taken(n)).unwrap()
(2..).map(|i| format!("{base} {i}")).find(|n| !taken(n)).unwrap_or_else(|| base.to_string())
}
fn instances_of(d: &Document, name: Option<&str>) -> Vec<NodeId> {
@@ -676,7 +677,7 @@ fn symbol_edit(s: &mut Session, p: &Value) -> Result<Value> {
let first = *ids.first().ok_or_else(|| EngineError::Other("select a symbol instance".into()))?;
let name = match &s.doc()?.doc.node(first).map(|n| n.kind.clone()) {
Some(NodeKind::SymbolInstance { symbol, .. }) => symbol.clone(),
_ => unreachable!(),
_ => return Err(EngineError::Other("select a symbol instance".into())),
};
let out = s.edit("Edit Symbol", |d, sel| {
let out = break_links(d, &[first])?;
crates/engine/src/cmd/buildcmds.rs
+10 -3
View File
@@ -308,7 +308,7 @@ fn sb_merge(s: &mut Session, p: &Value) -> Result<Value> {
new_nodes.push(shape_node(d, rest, Some(leaf)));
}
}
if !erase && i == style_src {
if !erase && Some(i) == style_src {
let mut m = shape_node(d, union.clone(), Some(leaf));
if let Some(f) = &fill {
m.appearance.set_fill(f.clone());
@@ -399,7 +399,7 @@ fn build_children(d: &mut Document, sources: Vec<Arc<Node>>) -> Result<(Vec<Arc<
let nfaces = regs.len();
for r in regs {
let id = d.alloc_id();
let fill = styles[r.top()].0.clone();
let fill = r.top().and_then(|t| styles.get(t)).map_or(Paint::None, |s| s.0.clone());
let mut n = Node::path(id, r.path, fill_only(fill));
n.name = Some(FACE_NAME.into());
children.push(Arc::new(n));
@@ -680,7 +680,14 @@ fn trace_make(s: &mut Session, p: &Value, expand: bool) -> Result<Value> {
let label = if expand { "Image Trace (Make and Expand)" } else { "Image Trace" };
let id = s.edit(label, |d, sel| {
let src = d.node(target).cloned().ok_or(EngineError::NoNode(target))?;
let mut image = if is_trace_group(&src) { (**src.children().unwrap().first().unwrap()).clone() } else { src.clone() };
let mut image = if is_trace_group(&src) {
src.children()
.and_then(|c| c.first())
.map(|c| (**c).clone())
.ok_or_else(|| EngineError::Other("Image Trace: the traced image is missing".into()))?
} else {
src.clone()
};
image.visible = true;
let mut children: Vec<Arc<Node>> = vec![];
if !expand {
crates/engine/src/cmd/colorcmds.rs
+12 -6
View File
@@ -131,6 +131,15 @@ pub(crate) fn to_gray(c: Color) -> Color {
c.in_model(Model::Gray)
}
/// Grayscale ink amount (0 = white, 1 = black) of a colour.
fn gray_level(c: Color) -> f32 {
match to_gray(c) {
Color::Gray { k } => k,
// `in_model(Gray)` always yields Gray.
_ => 0.0,
}
}
/// What a recolouring pass applies to a colour that can link to a swatch (a solid colour or a
/// gradient stop): `(colour, link, tint)`, true when it changed them.
pub(crate) type LinkMap<'a> = dyn Fn(&mut Color, &mut Option<String>, &mut f32) -> bool + 'a;
@@ -416,10 +425,7 @@ fn adjust_balance(s: &mut Session, p: &Value) -> Result<Value> {
}
"gray" => {
let dgray = g("gray");
Box::new(move |c| {
let Color::Gray { k } = to_gray(c) else { unreachable!() };
Color::gray(cl(k + dgray))
})
Box::new(move |c| Color::gray(cl(gray_level(c) + dgray)))
}
"global" => {
// Each linked colour moves to the shifted tint of its global swatch's current colour.
@@ -506,8 +512,8 @@ fn blend(s: &mut Session, order: BlendOrder) -> Result<Value> {
BlendOrder::Horizontal => ids.sort_by(|a, b| center(a).x.total_cmp(&center(b).x)),
BlendOrder::Vertical => ids.sort_by(|a, b| center(a).y.total_cmp(&center(b).y)),
}
let first = d.node(ids[0]).and_then(fill_color).unwrap_or_default();
let last = d.node(*ids.last().unwrap()).and_then(fill_color).unwrap_or_default();
let first = ids.first().and_then(|id| d.node(*id)).and_then(fill_color).unwrap_or_default();
let last = ids.last().and_then(|id| d.node(*id)).and_then(fill_color).unwrap_or_default();
// Ends in one model blend in it; mixed ones give colours in the document's model.
let model = if first.model() == last.model() { first.model() } else { d.color_mode.model() };
let n = ids.len();
crates/engine/src/cmd/distortcmds.rs
+2 -1
View File
@@ -356,7 +356,8 @@ fn liquify(s: &mut Session, p: &Value) -> Result<Value> {
let doc = &s.doc()?.doc;
let leaves = if roots.is_empty() {
// Nothing selected: everything the brush sweeps over.
let sweep = dab_pts.iter().map(|c| prm.brush_bounds(*c)).reduce(|a, b| a.union(b)).unwrap();
// No dabs sweep nothing.
let sweep = dab_pts.iter().map(|c| prm.brush_bounds(*c)).reduce(|a, b| a.union(b)).unwrap_or(vectorcraft_geom::Rect::ZERO);
let mut all = vec![];
doc.walk(|n| {
if matches!(n.kind, NodeKind::Path { guide: false, .. })
crates/engine/src/cmd/draw2.rs
+55 -34
View File
@@ -347,12 +347,13 @@ fn cut_subpath(sp: &SubPath, remove: &dyn Fn(Point) -> bool) -> Option<Vec<SubPa
}
// A closed path's last and first runs meet at anchor 0.
if sp.closed && runs.len() >= 2 {
let first_starts = runs[0][0].0 == 0 && runs[0][0].1 == 0.0;
let last = runs.last().unwrap();
let last_ends = last[last.len() - 1].0 == nseg - 1 && last[last.len() - 1].2 == 1.0;
let first_starts = runs.first().and_then(|r| r.first()).is_some_and(|s| s.0 == 0 && s.1 == 0.0);
let last_ends = runs.last().and_then(|r| r.last()).is_some_and(|s| s.0 + 1 == nseg && s.2 == 1.0);
if first_starts && last_ends {
let first = runs.remove(0);
runs.last_mut().unwrap().extend(first);
if let Some(last) = runs.last_mut() {
last.extend(first);
}
}
}
let out = runs
@@ -363,10 +364,10 @@ fn cut_subpath(sp: &SubPath, remove: &dyn Fn(Point) -> bool) -> Option<Vec<SubPa
for &(i, t0, t1) in r {
let c = sp.segment(i).subsegment(t0..t1);
let (h1, h2) = if sp.segment_is_line(i) { (c.p0, c.p3) } else { (c.p1, c.p2) };
if anchors.is_empty() {
anchors.push(Anchor::corner(c.p0));
match anchors.last_mut() {
Some(a) => a.h_out = h1,
None => anchors.push(Anchor { h_out: h1, ..Anchor::corner(c.p0) }),
}
anchors.last_mut().unwrap().h_out = h1;
anchors.push(Anchor { p: c.p3, h_in: h2, h_out: c.p3, kind: AnchorKind::Corner });
}
for a in &mut anchors {
@@ -419,16 +420,20 @@ fn path_kind(path: PathData) -> NodeKind {
/// corners) and simplify it to `tol`.
fn fit_freehand(pts: &[Point], tol: f64, closed: bool) -> SubPath {
let min = (tol * 0.3).max(0.05);
let mut kept: Vec<Point> = vec![pts[0]];
for &p in &pts[1..] {
if kept.last().unwrap().distance(p) >= min {
let (Some(&p0), Some(&pn)) = (pts.first(), pts.last()) else { return SubPath::new(vec![], closed) };
let mut kept: Vec<Point> = vec![p0];
for &p in pts.iter().skip(1) {
if kept.last().is_none_or(|k| k.distance(p) >= min) {
kept.push(p);
}
}
if let (Some(&l), true) = (pts.last(), kept.len() > 1) {
*kept.last_mut().unwrap() = l;
} else if kept.len() == 1 && pts.len() > 1 {
kept.push(pts[pts.len() - 1]);
// The last sample always ends the stroke.
if kept.len() > 1 {
if let Some(k) = kept.last_mut() {
*k = pn;
}
} else if pts.len() > 1 {
kept.push(pn);
}
let n = kept.len();
let marked: Vec<(Point, bool)> = (0..n)
@@ -465,25 +470,34 @@ fn freehand(s: &mut Session, p: &Value) -> Result<Value> {
if at_start {
sp.reverse();
}
let end = sp.anchors.last().unwrap().p;
pts[0] = end;
let (Some(first), Some(end)) = (sp.anchors.first().map(|a| a.p), sp.anchors.last().map(|a| a.p)) else {
return Err(bad(C, "path has no open end"));
};
let Some(p0) = pts.first_mut() else { return Err(bad(C, "needs points")) };
*p0 = end;
if pts.len() < 2 {
return Ok(json!({ "id": id.0 }));
}
let first = sp.anchors[0].p;
let close_tol = (tol * 4.0).max(6.0);
let closing = sp.anchors.len() >= 2 && pts.last().unwrap().distance(first) <= close_tol;
if closing {
*pts.last_mut().unwrap() = first;
let closing = sp.anchors.len() >= 2 && pts.last().is_some_and(|p| p.distance(first) <= close_tol);
if closing && let Some(l) = pts.last_mut() {
*l = first;
}
let fit = fit_freehand(&pts, tol, false);
let mut add = fit.anchors;
sp.anchors.last_mut().unwrap().h_out = add[0].h_out;
add.remove(0);
if let (Some(last), Some(a0)) = (sp.anchors.last_mut(), add.first()) {
last.h_out = a0.h_out;
}
if !add.is_empty() {
add.remove(0);
}
sp.anchors.extend(add);
if closing && sp.anchors.len() > 2 {
let l = sp.anchors.pop().unwrap();
sp.anchors[0].h_in = l.h_in;
if closing
&& sp.anchors.len() > 2
&& let Some(l) = sp.anchors.pop()
&& let Some(a0) = sp.anchors.first_mut()
{
a0.h_in = l.h_in;
sp.closed = true;
}
for a in &mut sp.anchors {
@@ -900,8 +914,10 @@ fn smooth_subpath(sp: &SubPath, near: &dyn Fn(Point) -> bool, tol: f64) -> Optio
m.push(false);
open.closed = false;
let mut res = smooth_open(&open.anchors, &m, tol);
let l = res.pop().unwrap();
res[0].h_in = l.h_in;
let l = res.pop()?;
if let Some(r0) = res.first_mut() {
r0.h_in = l.h_in;
}
return Some(SubPath::new(res, true));
}
Some(SubPath::new(smooth_open(&sp.anchors, &marked, tol), false))
@@ -1029,8 +1045,10 @@ fn join_scrub(s: &mut Session, p: &Value) -> Result<Value> {
if ida == idb && sa == sb {
let path = path_mut(d, ida)?;
let sp = &mut path.subpaths[sa];
if merge && sp.anchors.len() > 2 {
let l = sp.anchors.pop().unwrap();
if merge
&& sp.anchors.len() > 2
&& let Some(l) = sp.anchors.pop()
{
let d0 = mid - sp.anchors[0].p;
sp.anchors[0].translate(d0);
sp.anchors[0].h_in = l.h_in + (mid - l.p);
@@ -1048,10 +1066,12 @@ fn join_scrub(s: &mut Session, p: &Value) -> Result<Value> {
if !startb {
y.reverse();
}
if merge {
if merge
&& !y.anchors.is_empty()
&& let Some(last) = x.anchors.last_mut()
{
let yf = y.anchors.remove(0);
let lp = x.anchors.last().unwrap().p;
let last = x.anchors.last_mut().unwrap();
let lp = last.p;
last.translate(mid - lp);
last.h_out = yf.h_out + (mid - yf.p);
*last = Anchor::with_handles(last.p, last.h_in, last.h_out);
@@ -1117,8 +1137,9 @@ fn blob(s: &mut Session, p: &Value) -> Result<Value> {
let mut inputs: Vec<(&PathData, FillRule)> = vec![(&region, FillRule::NonZero)];
inputs.extend(merge_ids.iter().map(|(_, pd, r)| (pd, *r)));
let merged = po::unite_all(&inputs);
let keep = merge_ids.last().unwrap().0;
let others: Vec<NodeId> = merge_ids[..merge_ids.len() - 1].iter().map(|m| m.0).collect();
let Some(((keep, _, _), rest)) = merge_ids.split_last() else { return add_node(s, "Blob Brush", path_kind(region), ap, None) };
let keep = *keep;
let others: Vec<NodeId> = rest.iter().map(|m| m.0).collect();
s.edit("Blob Brush", |d, sel| {
*path_mut(d, keep)? = merged;
for id in others {
crates/engine/src/cmd/fileio/encode.rs
+1
View File
@@ -130,6 +130,7 @@ pub fn encode(doc: &Document, format: &str, p: &Value) -> Result<Vec<u8>> {
"webp" => img.to_webp(),
_ => img.to_jpeg(o.quality.unwrap_or(90)),
}
.map_err(EngineError::Other)?
}
_ => return Err(bad(C, format!("no encoder for {} yet", f.label))),
})
crates/engine/src/cmd/flatten.rs
+26 -20
View File
@@ -231,7 +231,7 @@ fn flatten(s: &mut Session, p: &Value) -> Result<Value> {
return Err(EngineError::Other("Flatten Transparency: select objects to flatten".into()));
}
let src = s.doc()?.doc.clone();
let plan = plan(&src, &roots, &o, true);
let plan = plan(&src, &roots, &o, true)?;
let options = serde_json::to_value(&o).unwrap_or_default();
if plan.flat.is_empty() && !plan.kept.iter().any(|id| src.node(*id).is_some_and(|n| kept_work(n, &o))) {
return Ok(json!({ "ids": roots.iter().map(|i| i.0).collect::<Vec<_>>(), "rasterized": 0, "vector": 0, "options": options }));
@@ -635,8 +635,8 @@ impl FlattenReport {
}
/// What flattening `roots` of `doc` with `o` would do.
pub fn report(doc: &Document, roots: &[NodeId], o: &FlattenOptions) -> FlattenReport {
let plan = plan(doc, roots, o, false);
pub fn report(doc: &Document, roots: &[NodeId], o: &FlattenOptions) -> Result<FlattenReport> {
let plan = plan(doc, roots, o, false)?;
let mut r = FlattenReport { transparent: plan.transparent, ..Default::default() };
// Every object under `id` (but a compound path's own pieces), visible ones only.
fn visit(n: &Node, f: &mut dyn FnMut(&Node)) {
@@ -685,7 +685,7 @@ pub fn report(doc: &Document, roots: &[NodeId], o: &FlattenOptions) -> FlattenRe
});
}
r.affected.sort_by_key(|id| doc.index_path(*id));
r
Ok(r)
}
impl Session {
@@ -704,7 +704,7 @@ impl Session {
let layers: Vec<u64> = self.doc()?.doc.layers.iter().map(|l| l.id.0).collect();
target_roots(self, &json!({ "ids": layers }))?
};
let r = report(&self.doc()?.doc, &roots, &o);
let r = report(&self.doc()?.doc, &roots, &o)?;
Ok((o, r))
}
}
@@ -778,8 +778,8 @@ struct Raster {
}
/// The flattening of `roots` with `o`; `render` renders the images (the preview only needs where
/// they go).
fn plan(src: &Document, roots: &[NodeId], o: &FlattenOptions, render: bool) -> Plan {
/// they go). Fails only when an image can't be encoded.
fn plan(src: &Document, roots: &[NodeId], o: &FlattenOptions, render: bool) -> Result<Plan> {
let tmp = isolated_doc(src, roots.iter().filter_map(|id| src.node(*id).cloned()).collect());
// Geometry effects first: what is left on the art are raster effects.
let baked = effects::bake_document(&tmp).unwrap_or(tmp);
@@ -792,19 +792,24 @@ fn plan(src: &Document, roots: &[NodeId], o: &FlattenOptions, render: bool) -> P
let mut out = Plan { flat: vec![], kept: vec![], transparent: roots.iter().zip(&see_through).filter(|(_, t)| **t).map(|(id, _)| *id).collect() };
for g in overlapping(&reaches) {
let ids: Vec<NodeId> = g.iter().map(|&i| roots[i]).collect();
let flat = g.iter().any(|&i| see_through[i]).then(|| {
let art: Vec<Node> = g.iter().map(|&i| art[i].clone()).collect();
let group = g.iter().any(|&i| see_through[i]).then(|| {
let plain: Vec<&Node> = g.iter().map(|&i| &plain[i]).collect();
let (regions, area) = flatten_group(&plain, o, cmyk)?;
let raster = area.as_ref().filter(|_| render).map(|a| render_raster(&baked, &art, a.rect, a.ppi, a.clip.clone(), o));
Some(Flat { roots: ids.clone(), regions, area, raster })
flatten_group(&plain, o, cmyk)
});
match flat.flatten() {
Some(f) => out.flat.push(f),
None => out.kept.extend(ids),
}
let Some((regions, area)) = group.flatten() else {
out.kept.extend(ids);
continue;
};
let raster = match area.as_ref().filter(|_| render) {
Some(a) => {
let art: Vec<Node> = g.iter().map(|&i| art[i].clone()).collect();
Some(render_raster(&baked, &art, a.rect, a.ppi, a.clip.clone(), o)?)
}
None => None,
};
out.flat.push(Flat { roots: ids, regions, area, raster });
}
out
Ok(out)
}
/// The regions and the image area replacing one group of overlapping objects (`plain`: the art as
@@ -902,8 +907,8 @@ fn region_fill(elems: &[Elem], sources: &[usize], o: &FlattenOptions, cmyk: bool
/// `art` rendered over `rect` at `ppi`: over white with the white the art doesn't cover taken out
/// again (so blend modes see the white page), or over nothing with Preserve Alpha. The image and
/// its `clip` reach a pixel further.
fn render_raster(doc: &Document, art: &[Node], rect: Rect, ppi: f64, clip: Option<PathData>, o: &FlattenOptions) -> Raster {
/// its `clip` reach a pixel further. Fails when the image can't be encoded.
fn render_raster(doc: &Document, art: &[Node], rect: Rect, ppi: f64, clip: Option<PathData>, o: &FlattenOptions) -> Result<Raster> {
let mut scale = ppi / 72.0;
scale = scale.min((MAX_PIXELS / (rect.width() * rect.height()).max(1.0)).sqrt());
let px = 1.0 / scale;
@@ -952,7 +957,8 @@ fn render_raster(doc: &Document, art: &[Node], rect: Rect, ppi: f64, clip: Optio
}
}
let xf = Affine::translate(region.origin().to_vec2()) * Affine::scale(1.0 / scale);
Raster { png: img.to_png(), width: img.width, height: img.height, xf, clip }
let png = img.to_png().map_err(|e| EngineError::Other(format!("Flatten Transparency: {e}")))?;
Ok(Raster { png, width: img.width, height: img.height, xf, clip })
}
/// `n` at full opacity with Normal blending throughout (objects, fills and strokes).
crates/engine/src/cmd/fonts.rs
+4 -1
View File
@@ -126,7 +126,10 @@ fn replace(s: &mut Session, p: &Value) -> Result<Value> {
for r in &mut t.runs {
if matches(&r.style) {
// An explicit style, else the closest the new family has to the old one.
let style = ts.clone().unwrap_or_else(|| db.face(&tf, &r.style.font_style).style.clone());
let style = ts
.clone()
.or_else(|| db.face(&tf, &r.style.font_style).map(|f| f.style.clone()))
.unwrap_or_else(|| r.style.font_style.clone());
r.style.font_family = tf.clone();
r.style.font_style = style;
changed = true;
crates/engine/src/cmd/live.rs
+3 -3
View File
@@ -463,7 +463,7 @@ fn blend_replace_spine(s: &mut Session, _: &Value) -> Result<Value> {
&& !blends.iter().any(|b| st.doc.ancestry(*id).unwrap_or_default().contains(b))
})
.ok_or_else(|| EngineError::Other("Replace Spine: select a blend and a path".into()))?;
let b = *blends.first().unwrap();
let Some(&b) = blends.first() else { return Err(EngineError::Other("Replace Spine: select a blend and a path".into())) };
s.edit("Replace Spine", |d, sel| {
let spine = d.node(path).and_then(|n| n.path_data().cloned()).ok_or(EngineError::NoNode(path))?;
d.remove(path)?;
@@ -576,9 +576,9 @@ fn env_make_top(s: &mut Session, p: &Value) -> Result<Value> {
if roots.len() < 2 {
return Err(bad(C, "select the content and a path on top"));
}
let top = *roots.last().unwrap();
let Some((&top, content)) = roots.split_last() else { return Err(bad(C, "select the content and a path on top")) };
let content = content.to_vec();
let path = s.doc()?.doc.node(top).and_then(outline_of).filter(|p| p.bounds().is_some()).ok_or_else(|| bad(C, "the top object must be a path"))?;
let content = roots[..roots.len() - 1].to_vec();
let id = s.edit("Make Envelope", |d, sel| {
let id = wrap(d, sel, &content, |id, content| envelope(id, content, EnvelopeKind::TopObject { path }))?;
d.remove(top)?;
crates/engine/src/cmd/menucmds.rs
+4 -4
View File
@@ -323,7 +323,7 @@ fn render_png(doc: &vectorcraft_doc::Document, region: Rect, scale: f64, white:
}
let mut r = vectorcraft_render::Renderer::new();
let img = r.render_region(doc, region, scale, white);
Ok((img.to_png(), img.width, img.height))
Ok((img.to_png().map_err(EngineError::Other)?, img.width, img.height))
}
fn rasterize(s: &mut Session, p: &Value) -> Result<Value> {
@@ -370,7 +370,7 @@ fn rasterize(s: &mut Session, p: &Value) -> Result<Value> {
fn has_image(s: &Session) -> std::result::Result<(), String> {
has_selection(s)?;
let st = s.active().unwrap();
let st = s.active().ok_or("no document open")?;
if st.selection.objects.iter().any(|id| matches!(st.doc.node(*id).map(|n| &n.kind), Some(NodeKind::Image(_)))) {
Ok(())
} else {
@@ -389,7 +389,7 @@ fn object_mosaic(s: &mut Session, p: &Value) -> Result<Value> {
.find(|id| matches!(st.doc.node(*id).map(|n| &n.kind), Some(NodeKind::Image(_))))
.ok_or_else(|| bad(C, "select an image"))?;
let node = st.doc.node(id).cloned().ok_or(EngineError::NoNode(id))?;
let NodeKind::Image(im) = &node.kind else { unreachable!() };
let NodeKind::Image(im) = &node.kind else { return Err(bad(C, "select an image")) };
let blob = st.doc.images.get(&im.key).filter(|b| !b.bytes.is_empty()).ok_or_else(|| bad(C, "the image has no embedded pixels"))?;
let raster = vectorcraft_trace::Raster::decode(&blob.bytes).map_err(|e| bad(C, e.to_string()))?;
let cols = p.get("columns").and_then(Value::as_u64).unwrap_or(10).clamp(1, 1000) as u32;
@@ -464,7 +464,7 @@ fn crop_image(s: &mut Session, p: &Value) -> Result<Value> {
.find(|id| matches!(st.doc.node(*id).map(|n| &n.kind), Some(NodeKind::Image(_))))
.ok_or_else(|| bad(C, "select an image"))?;
let node = st.doc.node(id).cloned().ok_or(EngineError::NoNode(id))?;
let NodeKind::Image(im) = &node.kind else { unreachable!() };
let NodeKind::Image(im) = &node.kind else { return Err(bad(C, "select an image")) };
let ib = node.geometric_bounds().ok_or_else(|| bad(C, "image has no bounds"))?;
let rect = match p.get("rect").and_then(Value::as_array) {
Some(a) if a.len() == 4 => {
crates/engine/src/cmd/mod.rs
+4 -4
View File
@@ -120,12 +120,12 @@ pub fn has_doc(s: &Session) -> std::result::Result<(), String> {
s.active().map(|_| ()).ok_or_else(|| "no document open".into())
}
pub fn has_selection(s: &Session) -> std::result::Result<(), String> {
has_doc(s)?;
if s.active().unwrap().selection.is_empty() { Err("nothing selected".into()) } else { Ok(()) }
let st = s.active().ok_or("no document open")?;
if st.selection.is_empty() { Err("nothing selected".into()) } else { Ok(()) }
}
pub fn has_multi(s: &Session) -> std::result::Result<(), String> {
has_doc(s)?;
if s.active().unwrap().selection.len() < 2 { Err("select at least two objects".into()) } else { Ok(()) }
let st = s.active().ok_or("no document open")?;
if st.selection.len() < 2 { Err("select at least two objects".into()) } else { Ok(()) }
}
pub fn can_undo(s: &Session) -> std::result::Result<(), String> {
s.active().filter(|d| !d.history.undo.is_empty()).map(|_| ()).ok_or_else(|| "nothing to undo".into())
crates/engine/src/cmd/object.rs
+2 -2
View File
@@ -511,7 +511,7 @@ fn compound_make(s: &mut Session, _: &Value) -> Result<Value> {
for id in &ids {
d.remove(*id)?;
}
let ch = d.node_mut(cid).unwrap().children_mut().unwrap();
let ch = d.node_mut(cid).and_then(|n| n.children_mut()).ok_or(EngineError::NoNode(cid))?;
for mut p in paths {
let pn = Arc::make_mut(&mut p);
pn.appearance = Appearance::default();
@@ -586,7 +586,7 @@ pub(super) fn release_clip(d: &mut Document, id: NodeId) {
fn clip_make(s: &mut Session, _: &Value) -> Result<Value> {
let ids = selected_roots(s)?;
let top = *ids.last().unwrap();
let Some(&top) = ids.last() else { return Err(EngineError::Other("nothing selected".into())) };
let gid = s.edit("Make Clipping Mask", |d, sel| {
make_clipping_path(d, top)?;
let (par, idx, _) = d.position(top).ok_or(EngineError::NoNode(top))?;
crates/engine/src/cmd/path.rs
+21 -8
View File
@@ -283,6 +283,11 @@ fn reverse(s: &mut Session, p: &Value) -> Result<Value> {
Ok(json!({ "changed": changed }))
}
/// First and last anchor points of a subpath.
fn end_points(sp: &SubPath) -> Option<(Point, Point)> {
Some((sp.anchors.first()?.p, sp.anchors.last()?.p))
}
fn join(s: &mut Session, _: &Value) -> Result<Value> {
let ids = selected_paths(s)?;
match ids.as_slice() {
@@ -292,9 +297,12 @@ fn join(s: &mut Session, _: &Value) -> Result<Value> {
let path = path_mut(d, id)?;
let sp = path.subpaths.iter_mut().find(|s| !s.closed).ok_or_else(|| EngineError::Other("path is already closed".into()))?;
// Merge coincident end points.
if sp.anchors.len() > 2 && sp.anchors[0].p.distance(sp.anchors.last().unwrap().p) < 1e-6 {
let last = sp.anchors.pop().unwrap();
sp.anchors[0].h_in = last.h_in;
if sp.anchors.len() > 2
&& end_points(sp).is_some_and(|(f, l)| f.distance(l) < 1e-6)
&& let Some(last) = sp.anchors.pop()
&& let Some(first) = sp.anchors.first_mut()
{
first.h_in = last.h_in;
}
sp.closed = true;
Ok(())
@@ -310,21 +318,26 @@ fn join(s: &mut Session, _: &Value) -> Result<Value> {
};
let mut x = pa.subpaths[sa].clone();
let mut y = pb.subpaths[sb].clone();
let (xf, xl) = (x.anchors[0].p, x.anchors.last().unwrap().p);
let (yf, yl) = (y.anchors[0].p, y.anchors.last().unwrap().p);
let (Some((xf, xl)), Some((yf, yl))) = (end_points(&x), end_points(&y)) else {
return Err(EngineError::Other("join needs open paths".into()));
};
// Pick the closest pair of ends.
let cands =
[(xl.distance(yf), false, false), (xl.distance(yl), false, true), (xf.distance(yf), true, false), (xf.distance(yl), true, true)];
let (_, rx, ry) = cands.into_iter().min_by(|p, q| p.0.total_cmp(&q.0)).unwrap();
let (_, rx, ry) = cands.into_iter().min_by(|p, q| p.0.total_cmp(&q.0)).unwrap_or((0.0, false, false));
if rx {
x.reverse();
}
if ry {
y.reverse();
}
if x.anchors.last().unwrap().p.distance(y.anchors[0].p) < 1e-6 {
if let (Some(xe), Some(ys)) = (x.anchors.last().map(|a| a.p), y.anchors.first().map(|a| a.p))
&& xe.distance(ys) < 1e-6
{
let first = y.anchors.remove(0);
x.anchors.last_mut().unwrap().h_out = first.h_out;
if let Some(l) = x.anchors.last_mut() {
l.h_out = first.h_out;
}
}
x.anchors.extend(y.anchors);
pa.subpaths[sa] = x;
crates/engine/src/cmd/pathops.rs
+14 -6
View File
@@ -324,11 +324,14 @@ fn run_pf(s: &mut Session, op: PathfinderOp) -> Result<Value> {
if lv.is_empty() {
continue;
}
if shape_mode && lv.len() > 1 {
if shape_mode
&& lv.len() > 1
&& let Some(top) = lv.last()
{
// A group acts as one shape (the union of its leaves) with its top leaf's style.
let parts: Vec<(PathData, FillRule)> = lv.iter().filter_map(node_path).collect();
let refs: Vec<(&PathData, FillRule)> = parts.iter().map(|(p, r)| (p, *r)).collect();
push(po::unite_all(&refs), FillRule::NonZero, style_of(lv.last().unwrap()));
push(po::unite_all(&refs), FillRule::NonZero, style_of(top));
} else {
for l in &lv {
if let Some((p, r)) = node_path(l) {
@@ -349,8 +352,10 @@ fn run_pf(s: &mut Session, op: PathfinderOp) -> Result<Value> {
}
let (par, idx, _) = d.position(top).ok_or(EngineError::NoNode(top))?;
let new_node = if shape_mode {
let r = results.into_iter().find(|r| !r.path.is_empty()).unwrap();
shape_node_styled(d, r.path, &styles[r.key as usize])
let r =
results.into_iter().find(|r| !r.path.is_empty()).ok_or_else(|| EngineError::Other(format!("{label} produced an empty result")))?;
let style = styles.get(r.key as usize).ok_or_else(|| EngineError::Other(format!("{label}: lost track of a shape's style")))?;
shape_node_styled(d, r.path, style)
} else {
let mut children = vec![];
for r in results {
@@ -418,8 +423,11 @@ fn offset_path(s: &mut Session, p: &Value) -> Result<Value> {
if made.is_empty() {
continue;
}
let new = if made.len() == 1 && !matches!(n.kind, NodeKind::Group { .. }) {
made.pop().unwrap()
let new = if made.len() == 1
&& !matches!(n.kind, NodeKind::Group { .. })
&& let Some(one) = made.pop()
{
one
} else {
let gid = d.alloc_id();
Node::group(gid, made.into_iter().map(Arc::new).collect())
crates/engine/src/cmd/patterncmds.rs
+3 -6
View File
@@ -212,11 +212,11 @@ fn unique_pattern_name(d: &Document, base: &str) -> String {
if d.pattern(base).is_none() && d.swatch(base).is_none() {
return base.to_string();
}
(2..).map(|i| format!("{base} {i}")).find(|n| d.pattern(n).is_none() && d.swatch(n).is_none()).unwrap()
(2..).map(|i| format!("{base} {i}")).find(|n| d.pattern(n).is_none() && d.swatch(n).is_none()).unwrap_or_else(|| base.to_string())
}
fn next_pattern_name(d: &Document) -> String {
(1..).map(|i| format!("New Pattern {i}")).find(|n| d.pattern(n).is_none() && d.swatch(n).is_none()).unwrap()
(1..).map(|i| format!("New Pattern {i}")).find(|n| d.pattern(n).is_none() && d.swatch(n).is_none()).unwrap_or_else(|| "New Pattern".to_string())
}
/// Add pattern `def` and its swatch.
@@ -633,11 +633,8 @@ fn make_repeat(s: &mut Session, p: &Value, label: &str, make: impl Fn(Vec<Arc<No
return Ok(json!({ "id": r.0 }));
}
let roots = roots(s, p)?;
if roots.is_empty() {
return Err(EngineError::Other("select the art to repeat".into()));
}
let Some(&top) = roots.last() else { return Err(EngineError::Other("select the art to repeat".into())) };
let id = s.edit(label, |d, sel| {
let top = *roots.last().unwrap();
let (par, idx, _) = d.position(top).ok_or(EngineError::NoNode(top))?;
let nodes: Vec<Arc<Node>> = roots.iter().filter_map(|id| d.node(*id).cloned()).map(Arc::new).collect();
let id = d.alloc_id();
crates/engine/src/cmd/rasterfx.rs
+4 -2
View File
@@ -94,19 +94,21 @@ pub(crate) fn effect_image(out: &mut Document, whole: &Node, knockout: Option<&N
let mut img = render(out, vec![whole.clone()], region, scale);
if let Some(bare) = knockout {
let obj = render(out, vec![bare.clone()], region, scale);
for (px, o) in img.pixels.chunks_exact_mut(4).zip(obj.pixels.chunks_exact(4)) {
for (px, o) in img.pixels.as_chunks_mut::<4>().0.iter_mut().zip(obj.pixels.as_chunks::<4>().0) {
let keep = 1.0 - o[3] as f32 / 255.0;
for c in px.iter_mut() {
*c = (*c as f32 * keep).round() as u8;
}
}
}
// Can't encode: keep the object as it is (vector, effects ignored) rather than fail the export.
let png = img.to_png().ok()?;
let id = out.alloc_id();
let mut key = format!("raster-effect-{}", id.0);
while out.images.contains_key(&key) {
key.push('+');
}
out.images.insert(key.clone(), ImageBlob { mime: "image/png".into(), bytes: Arc::new(img.to_png()) });
out.images.insert(key.clone(), ImageBlob { mime: "image/png".into(), bytes: Arc::new(png) });
let xf = Affine::translate(region.origin().to_vec2()) * Affine::scale(1.0 / scale);
let mut image = Node::new(id, NodeKind::Image(ImageObject { key, width: img.width, height: img.height, xf, link: None }));
image.name = Some("Raster effect".into());
crates/engine/src/cmd/select.rs
+1 -1
View File
@@ -155,7 +155,7 @@ fn step(s: &mut Session, dir: i64) -> Result<Value> {
if j < 0 || j >= n as i64 {
return ok();
}
let id = st.doc.children(par).unwrap()[j as usize].id;
let Some(id) = st.doc.children(par).and_then(|c| c.get(j as usize)).map(|n| n.id) else { return ok() };
s.select(|_, sel| sel.set([id]))?;
ok()
}
crates/engine/src/cmd/textedit.rs
+5 -2
View File
@@ -231,8 +231,11 @@ impl CharChange {
// Keep the style when the new family has it, else its closest match.
if self.style.is_none() {
let styles = vectorcraft_text::FontDb::global().styles(f);
if !styles.is_empty() && !styles.iter().any(|s| s.eq_ignore_ascii_case(&st.font_style)) {
st.font_style = vectorcraft_text::FontDb::global().face(f, &st.font_style).style.clone();
if !styles.is_empty()
&& !styles.iter().any(|s| s.eq_ignore_ascii_case(&st.font_style))
&& let Some(face) = vectorcraft_text::FontDb::global().face(f, &st.font_style)
{
st.font_style = face.style.clone();
}
}
}
crates/engine/src/cmd/textstyles.rs
+7 -10
View File
@@ -141,19 +141,16 @@ fn with_attrs<T: Serialize + DeserializeOwned>(base: &T, attrs: &Map<String, Val
}
/// `cur` after its style changed from `old` to `new`: attributes still equal to the old style's
/// value (or not set by it) take the new value; overrides stay.
fn restyle<T: Serialize + DeserializeOwned>(cur: &T, old: &Map<String, Value>, new: &Map<String, Value>) -> T {
let mut m = match serde_json::to_value(cur) {
Ok(Value::Object(m)) => m,
_ => return serde_json::from_value(serde_json::to_value(cur).unwrap_or_default()).unwrap_or_else(|_| unreachable!()),
};
/// value (or not set by it) take the new value; overrides stay. Unchanged if the style doesn't
/// round-trip through JSON.
fn restyle<T: Serialize + DeserializeOwned + Clone>(cur: &T, old: &Map<String, Value>, new: &Map<String, Value>) -> T {
let Ok(Value::Object(mut m)) = serde_json::to_value(cur) else { return cur.clone() };
for (k, v) in new {
if old.get(k).is_none_or(|o| m.get(k) == Some(o)) {
m.insert(k.clone(), v.clone());
}
}
serde_json::from_value(Value::Object(m.clone()))
.unwrap_or_else(|_| serde_json::from_value(serde_json::to_value(cur).unwrap_or_default()).expect("round trip"))
serde_json::from_value(Value::Object(m)).unwrap_or_else(|_| cur.clone())
}
/// Every text object id in the document.
@@ -276,7 +273,7 @@ fn new(s: &mut Session, p: &Value, kind: Kind) -> Result<Value> {
let base = if kind == Kind::Char { "Character Style" } else { "Paragraph Style" };
let name = match str_param(p, "name") {
Some(n) => n.to_string(),
None => (1..).map(|i| format!("{base} {i}")).find(|n| kind.attrs(d, n).is_none()).expect("free name"),
None => (1..).map(|i| format!("{base} {i}")).find(|n| kind.attrs(d, n).is_none()).unwrap_or_else(|| base.to_string()),
};
if name.trim().is_empty() || kind.attrs(d, &name).is_some() {
return Err(bad(&c, format!("a style named `{name}` already exists")));
@@ -387,7 +384,7 @@ fn duplicate(s: &mut Session, p: &Value, kind: Kind) -> Result<Value> {
let copy = (1..)
.map(|i| if i == 1 { format!("{name} copy") } else { format!("{name} copy {i}") })
.find(|n| kind.attrs(d, n).is_none())
.expect("free name");
.unwrap_or_else(|| format!("{name} copy"));
new(s, &json!({ "name": copy, "attrs": attrs }), kind)
}
crates/engine/src/cmd/threads.rs
+1 -1
View File
@@ -47,7 +47,7 @@ pub fn specs() -> Vec<CommandSpec> {
fn has_thread_selection(s: &Session) -> std::result::Result<(), String> {
has_selection(s)?;
let st = s.active().unwrap();
let st = s.active().ok_or("no document open")?;
if st.selection.objects.iter().any(|id| st.doc.text_threads.iter().any(|t| t.contains(id))) {
Ok(())
} else {
crates/engine/src/cmd/typecmd.rs
+1 -1
View File
@@ -250,7 +250,7 @@ fn area_options(s: &mut Session, p: &Value) -> Result<Value> {
let first = ids.first().ok_or_else(|| bad(C, "select area type (text in a frame)"))?;
let current = match &s.doc()?.doc.node(*first).map(|n| &n.kind) {
Some(NodeKind::Text(t)) => t.area.clone(),
_ => unreachable!(),
_ => return Err(bad(C, "select area type (text in a frame)")),
};
let mut v = serde_json::to_value(&current).map_err(|e| EngineError::Other(e.to_string()))?;
let mut changed = false;
crates/engine/src/guard.rs
+46
View File
@@ -0,0 +1,46 @@
//! Last line of defence against bugs: frontends never crash on a panic.
//!
//! Code must not panic (see `AGENTS.md` › Robustness); fallible work returns `Result`. Should a bug
//! panic anyway, the entry points ([`crate::Session::execute`], tool events, the MCP server, the UI
//! frame and the control channel) catch it with [`catch_panic`], roll back what they can and report
//! an error instead of taking the app (and the user's unsaved work) down.
//!
//! On wasm the panic strategy is `abort`, so this only helps native builds; the rule against
//! panicking code is what protects the web app.
use std::any::Any;
use std::panic::{AssertUnwindSafe, catch_unwind};
/// Runs `f`, turning a panic into `Err(message)`. The default panic hook still prints the message
/// and location to stderr. Callers must leave their state consistent after an `Err` (roll back, or
/// rebuild the part `f` was working on).
pub fn catch_panic<T>(f: impl FnOnce() -> T) -> Result<T, String> {
catch_unwind(AssertUnwindSafe(f)).map_err(|payload| {
let msg = panic_message(payload.as_ref());
log::error!("recovered from a panic: {msg}");
msg
})
}
/// The message of a panic payload (`panic!("…")` carries a `&str` or a `String`).
pub fn panic_message(payload: &(dyn Any + Send)) -> String {
if let Some(s) = payload.downcast_ref::<&str>() {
(*s).to_string()
} else if let Some(s) = payload.downcast_ref::<String>() {
s.clone()
} else {
"unknown panic".to_string()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn catch_panic_returns_value_or_message() {
assert_eq!(catch_panic(|| 7), Ok(7));
assert_eq!(catch_panic(|| -> i32 { panic!("boom {}", 1) }), Err("boom 1".to_string()));
assert_eq!(catch_panic(|| -> i32 { std::panic::panic_any(5_u8) }), Err("unknown panic".to_string()));
}
}
crates/engine/src/lib.rs
+41 -3
View File
@@ -7,6 +7,7 @@
#![forbid(unsafe_code)]
pub mod cmd;
pub mod guard;
pub mod inspect;
mod tooling;
@@ -39,6 +40,9 @@ pub enum EngineError {
NoNode(NodeId),
#[error("{0}")]
Other(String),
/// A bug: the command panicked. The document was rolled back to its state before the command.
#[error("internal error in `{cmd}`: {msg} (the document was left as it was before; please report this bug)")]
Internal { cmd: String, msg: String },
}
impl From<vectorcraft_doc::DocError> for EngineError {
@@ -489,6 +493,8 @@ pub struct Session {
pub(crate) tool: Box<dyn Tool>,
pub(crate) last_view: ViewInfo,
depth: u32,
/// Set when the active tool panicked (see [`guard`]); reported by the next tool event.
tool_panic: Option<EngineError>,
/// Draw Normal / Behind / Inside (toolbar drawing modes).
pub draw_mode: DrawMode,
/// The path new art is drawn inside (Draw Inside).
@@ -545,6 +551,7 @@ impl Session {
tool: vectorcraft_tools::create("selection"),
last_view: ViewInfo::default(),
depth: 0,
tool_panic: None,
draw_mode: DrawMode::Normal,
draw_inside: None,
untitled_counter: 0,
@@ -654,9 +661,7 @@ impl Session {
if self.depth == 0 {
self.journal_note.clear();
}
self.depth += 1;
let r = (spec.run)(self, params);
self.depth -= 1;
let r = if self.depth == 0 { self.run_guarded(id, |s| (spec.run)(s, params)) } else { self.run_nested(|s| (spec.run)(s, params)) };
let r = r?;
if self.depth == 0 {
self.inherit_new_art();
@@ -690,6 +695,39 @@ impl Session {
}
}
fn run_nested(&mut self, f: impl FnOnce(&mut Self) -> Result<Value>) -> Result<Value> {
self.depth += 1;
let r = f(self);
self.depth -= 1;
r
}
/// A top-level command: a panic (a bug) becomes [`EngineError::Internal`] and the active
/// document goes back to how it was before the command, instead of crashing the frontend.
fn run_guarded(&mut self, id: &str, f: impl FnOnce(&mut Self) -> Result<Value>) -> Result<Value> {
let snapshot = self.active().map(|d| (d.uid, d.doc.clone(), d.selection.clone(), d.interaction.clone()));
let active = self.active;
match guard::catch_panic(|| self.run_nested(f)) {
Ok(r) => r,
Err(msg) => {
self.depth = 0;
self.journal_note.clear();
if let Some((uid, doc, selection, interaction)) = snapshot
&& let Some(st) = self.docs.iter_mut().find(|d| d.uid == uid)
{
st.doc = doc;
st.selection = selection;
st.interaction = interaction;
st.revision += 1;
}
if active.is_some_and(|i| i < self.docs.len()) {
self.active = active;
}
Err(EngineError::Internal { cmd: id.to_string(), msg })
}
}
}
/// Run `f` on a mutable copy of the active document. Outside an interaction this records one
/// undo step labelled `label`; inside one it just mutates (the interaction commits later).
pub fn edit<T>(&mut self, label: &str, f: impl FnOnce(&mut Document, &mut Selection) -> Result<T>) -> Result<T> {
crates/engine/src/tests.rs
+29
View File
@@ -481,3 +481,32 @@ fn shaper_turns_rough_strokes_into_live_shapes_and_scribbles_delete() {
stroke(&mut s, &zig);
assert!(s.doc().unwrap().doc.node(id).is_none());
}
#[test]
fn a_panicking_command_rolls_back_instead_of_crashing() {
let mut s = session();
let a = rect(&mut s, 10.0, 10.0, 100.0, 50.0);
let before = s.doc().unwrap().doc.clone();
let undo_steps = s.doc().unwrap().history.undo.len();
// A bug halfway through a command: the document was already changed in place, inside a
// nested command.
let r = s.run_guarded("test.panic", |s| {
let st = s.doc_mut()?;
Arc::make_mut(&mut st.doc).remove(a)?;
st.selection = Selection::default();
s.run_nested(|_| panic!("boom"))
});
match r {
Err(EngineError::Internal { cmd, msg }) => assert_eq!((cmd.as_str(), msg.as_str()), ("test.panic", "boom")),
other => panic!("expected an internal error, got {other:?}"),
}
let st = s.doc().unwrap();
assert!(Arc::ptr_eq(&st.doc, &before), "document rolled back");
assert_eq!(st.selection.objects, vec![a]);
assert_eq!(st.history.undo.len(), undo_steps);
assert_eq!(s.depth, 0);
// The session keeps working (and journaling top-level commands).
let b = rect(&mut s, 200.0, 10.0, 50.0, 50.0);
assert!(s.doc().unwrap().doc.node(b).is_some());
assert_eq!(s.journal.last().map(|j| j.0.as_str()), Some("shape.rectangle"));
}
crates/engine/src/tooling.rs
+21 -2
View File
@@ -4,7 +4,7 @@ use serde_json::Value;
use vectorcraft_geom::Point;
use vectorcraft_tools::{Action, Cursor, Mods, Overlay, PointerEvent, ToolContext, ToolKey};
use crate::{Result, Session};
use crate::{EngineError, Result, Session};
/// View state the tools need from the frontend.
#[derive(Clone, Copy, Debug)]
@@ -86,24 +86,43 @@ impl Session {
raster_sample: self.prefs.eyedropper.sample_size,
preview_bounds: self.prefs.use_preview_bounds,
};
f(self.tool.as_mut(), &cx)
let tool = &mut self.tool;
match crate::guard::catch_panic(|| f(tool.as_mut(), &cx)) {
Ok(r) => r,
Err(msg) => {
// A bug in the tool: start it afresh and drop its half-done drag.
let id = self.tool.id();
self.tool = vectorcraft_tools::create(id);
let _ = self.cancel_interaction();
self.tool_panic = Some(EngineError::Internal { cmd: format!("tool `{id}`"), msg });
R::default()
}
}
}
/// The error of a tool that panicked in the last [`Self::with_tool_cx`] call, if any.
fn take_tool_panic(&mut self) -> Result<()> {
self.tool_panic.take().map_or(Ok(()), Err)
}
/// Feed a pointer event to the active tool. Returns requests for the UI.
pub fn pointer(&mut self, ev: &PointerEvent, view: ViewInfo) -> Result<Vec<UiRequest>> {
self.last_view = view;
let acts = self.with_tool_cx(view, |t, cx| t.pointer(cx, ev));
self.take_tool_panic()?;
self.apply_actions(acts)
}
pub fn tool_key(&mut self, key: ToolKey, mods: Mods, view: ViewInfo) -> Result<Vec<UiRequest>> {
let acts = self.with_tool_cx(view, |t, cx| t.key(cx, key, mods));
self.take_tool_panic()?;
self.apply_actions(acts)
}
/// Typed text for the active tool (Type tool).
pub fn tool_text(&mut self, text: &str, view: ViewInfo) -> Result<Vec<UiRequest>> {
let acts = self.with_tool_cx(view, |t, cx| t.text_input(cx, text));
self.take_tool_panic()?;
self.apply_actions(acts)
}