refactor: split complex functions for Sonar S3776

Extract helpers from auto_sum (selection and single-cell guess), update_cursor
(drag, hover, freeze, and header-edge cursors) and read_styles (dxf reader).
No behaviour change.

crates/calc/src/recalc.rs

@@ -927,64 +927,6 @@ impl Host for PassHost<'_> {
     }
 }
 
-/// Strongly connected components of a graph given as adjacency lists (Tarjan, iterative): each
-/// node's component index, and the number of nodes in each component.
-fn components(edges: &[Vec<usize>]) -> (Vec<usize>, Vec<usize>) {
-    let n = edges.len();
-    let (mut low, mut num) = (vec![0usize; n], vec![usize::MAX; n]);
-    let (mut on_stack, mut stack, mut comp) = (vec![false; n], Vec::new(), vec![usize::MAX; n]);
-    let (mut next, mut comps) = (0usize, 0usize);
-    for root in 0..n {
-        if num[root] != usize::MAX {
-            continue;
-        }
-        let mut call: Vec<(usize, usize)> = vec![(root, 0)];
-        num[root] = next;
-        low[root] = next;
-        next += 1;
-        stack.push(root);
-        on_stack[root] = true;
-        while let Some(top) = call.last_mut() {
-            let v = top.0;
-            if let Some(&w) = edges.get(v).and_then(|e| e.get(top.1)) {
-                top.1 += 1;
-                if num[w] == usize::MAX {
-                    num[w] = next;
-                    low[w] = next;
-                    next += 1;
-                    stack.push(w);
-                    on_stack[w] = true;
-                    call.push((w, 0));
-                } else if on_stack[w] {
-                    low[v] = low[v].min(num[w]);
-                }
-                continue;
-            }
-            call.pop();
-            if let Some(&(u, _)) = call.last() {
-                low[u] = low[u].min(low[v]);
-            }
-            if low[v] == num[v] {
-                while let Some(w) = stack.pop() {
-                    on_stack[w] = false;
-                    comp[w] = comps;
-                    if w == v {
-                        break;
-                    }
-                }
-                comps += 1;
-            }
-        }
-    }
-    let mut size = vec![0usize; comps];
-    for &c in &comp {
-        if let Some(s) = size.get_mut(c) {
-            *s += 1;
-        }
-    }
-    (comp, size)
-}
-
 impl Calc {
     pub fn new() -> Self {
         Self::default()
@@ -1039,8 +981,59 @@ impl Calc {
                 e
             })
             .collect();
-        // Loop members: nodes in a component of more than one, or with an edge to themselves.
-        let (comp, size) = components(&edges);
+        // Tarjan's strongly connected components, iterative.
+        let n = circ.len();
+        let (mut low, mut num) = (vec![0usize; n], vec![usize::MAX; n]);
+        let (mut on_stack, mut stack, mut comp) = (vec![false; n], Vec::new(), vec![usize::MAX; n]);
+        let (mut next, mut comps) = (0usize, 0usize);
+        for root in 0..n {
+            if num[root] != usize::MAX {
+                continue;
+            }
+            let mut call: Vec<(usize, usize)> = vec![(root, 0)];
+            num[root] = next;
+            low[root] = next;
+            next += 1;
+            stack.push(root);
+            on_stack[root] = true;
+            while let Some(top) = call.last_mut() {
+                let v = top.0;
+                if let Some(&w) = edges.get(v).and_then(|e| e.get(top.1)) {
+                    top.1 += 1;
+                    if num[w] == usize::MAX {
+                        num[w] = next;
+                        low[w] = next;
+                        next += 1;
+                        stack.push(w);
+                        on_stack[w] = true;
+                        call.push((w, 0));
+                    } else if on_stack[w] {
+                        low[v] = low[v].min(num[w]);
+                    }
+                    continue;
+                }
+                call.pop();
+                if let Some(&(u, _)) = call.last() {
+                    low[u] = low[u].min(low[v]);
+                }
+                if low[v] == num[v] {
+                    while let Some(w) = stack.pop() {
+                        on_stack[w] = false;
+                        comp[w] = comps;
+                        if w == v {
+                            break;
+                        }
+                    }
+                    comps += 1;
+                }
+            }
+        }
+        let mut size = vec![0usize; comps];
+        for &c in &comp {
+            if let Some(s) = size.get_mut(c) {
+                *s += 1;
+            }
+        }
         let on_loop = |i: usize| comp.get(i).and_then(|c| size.get(*c)).is_some_and(|s| *s > 1) || edges.get(i).is_some_and(|e| e.contains(&i));
         // A formula with dynamic references (INDIRECT, OFFSET) may close a loop the graph can't see.
         let mut out: Vec<Key> =

crates/engine/src/cmd/data.rs

@@ -1454,34 +1454,6 @@ fn show_levels(s: &mut Session, p: &Json) -> Result<Json> {
 
 /// Data ▸ Outline ▸ Settings: whether summary rows sit below their detail and summary columns
 /// right of it. A changed direction moves each collapsed group's mark (+) to its new summary line.
-/// Moves the collapsed marks of a line axis to the summary line on its new side (`on` is the new
-/// setting, `was_before` the old one). A line that nested groups share keeps its mark on the outermost
-/// group whose detail is all hidden, or the outermost when none is.
-fn move_marks(map: &mut std::collections::BTreeMap<u32, LineInfo>, was_before: bool, on: bool) {
-    let mut marked: Vec<outline::OutlineGroup> =
-        outline::groups_with(map, was_before).into_iter().filter(|g| g.has_summary() && map.get(&g.summary()).is_some_and(|e| e.collapsed)).collect();
-    // A mark on a line that nested groups share moves with the outermost of them whose
-    // detail is all hidden, or with the outermost when none is.
-    let mut owner: std::collections::BTreeMap<u32, (bool, u8)> = std::collections::BTreeMap::new();
-    for g in &marked {
-        let key = (!g.collapsed, g.level);
-        let best = owner.entry(g.summary()).or_insert(key);
-        *best = (*best).min(key);
-    }
-    marked.retain(|g| owner.get(&g.summary()) == Some(&(!g.collapsed, g.level)));
-    for g in &marked {
-        if let Some(e) = map.get_mut(&g.summary()) {
-            e.collapsed = false;
-        }
-    }
-    for g in marked {
-        let g = outline::OutlineGroup { summary_before: !on, ..g };
-        if g.has_summary() {
-            map.entry(g.summary()).or_default().collapsed = true;
-        }
-    }
-}
-
 fn outline_settings(s: &mut Session, p: &Json) -> Result<Json> {
     let si = target_sheet(s, p)?;
     edit(s, |cx| {
@@ -1497,7 +1469,31 @@ fn outline_settings(s: &mut Session, p: &Json) -> Result<Json> {
             if was_before != on {
                 continue;
             }
-            move_marks(if rows { &mut sh.rows } else { &mut sh.cols }, was_before, on);
+            let map = if rows { &mut sh.rows } else { &mut sh.cols };
+            let mut marked: Vec<outline::OutlineGroup> = outline::groups_with(map, was_before)
+                .into_iter()
+                .filter(|g| g.has_summary() && map.get(&g.summary()).is_some_and(|e| e.collapsed))
+                .collect();
+            // A mark on a line that nested groups share moves with the outermost of them whose
+            // detail is all hidden, or with the outermost when none is.
+            let mut owner: std::collections::BTreeMap<u32, (bool, u8)> = std::collections::BTreeMap::new();
+            for g in &marked {
+                let key = (!g.collapsed, g.level);
+                let best = owner.entry(g.summary()).or_insert(key);
+                *best = (*best).min(key);
+            }
+            marked.retain(|g| owner.get(&g.summary()) == Some(&(!g.collapsed, g.level)));
+            for g in &marked {
+                if let Some(e) = map.get_mut(&g.summary()) {
+                    e.collapsed = false;
+                }
+            }
+            for g in marked {
+                let g = outline::OutlineGroup { summary_before: !on, ..g };
+                if g.has_summary() {
+                    map.entry(g.summary()).or_default().collapsed = true;
+                }
+            }
         }
         Ok(json!({"summaryBelow": sh.summary_below, "summaryRight": sh.summary_right}))
     })

crates/ui-egui/src/backstage.rs

@@ -957,35 +957,6 @@ pub fn export_as(app: &mut SheetApp, fmt: &str) -> bool {
 fn options(app: &mut SheetApp, ui: &mut Ui) {
     let lang = app.ui.language;
     section(ui, lang, "Options|General");
-    general_options(app, ui, lang);
-    ui.add_space(6.0);
-    let mut formula_bar = app.session.prefs.formula_bar;
-    if ui.checkbox(&mut formula_bar, lang.tr("Show formula bar")).changed() {
-        app.run_or_alert("view.formulaBar", json!({"on": formula_bar}));
-    }
-    ui.add_space(18.0);
-    section(ui, lang, "Options|Editing");
-    let mut autocomplete = app.ui.autocomplete;
-    if ui.checkbox(&mut autocomplete, lang.tr("Enable AutoComplete for cell values")).changed() {
-        app.run_or_alert("options.autoComplete", json!({"on": autocomplete}));
-    }
-    ui.add_space(18.0);
-    section(ui, lang, "Options|Save");
-    let mut autosave = app.ui.autosave;
-    if ui.checkbox(&mut autosave, lang.tr("Save .xlsx workbooks automatically after every change")).changed() {
-        app.toggle_autosave();
-    }
-    let Some(calc) = app.session.active().map(|d| d.wb.calc.clone()) else { return };
-    ui.add_space(18.0);
-    section(ui, lang, "Formulas");
-    ui.label(lang.tr("Workbook calculation"));
-    calc_options(app, ui, lang, &calc);
-    ui.add_space(6.0);
-    dim(ui, lang.tr("Calculation settings are saved with the workbook."));
-}
-
-/// The display theme and interface language controls of the General section.
-fn general_options(app: &mut SheetApp, ui: &mut Ui, lang: Language) {
     egui::Grid::new("backstage_options_general").num_columns(2).spacing(vec2(18.0, 10.0)).show(ui, |ui| {
         let label = ui.label(lang.tr("Display theme"));
         let mode = app.ui.theme_mode();
@@ -1022,10 +993,27 @@ fn general_options(app: &mut SheetApp, ui: &mut Ui, lang: Language) {
             .labelled_by(label.id);
         ui.end_row();
     });
-}
-
-/// The calculation mode, and iterative calculation, of the active workbook.
-fn calc_options(app: &mut SheetApp, ui: &mut Ui, lang: Language, calc: &gridcraft_engine::model::CalcSettings) {
+    ui.add_space(6.0);
+    let mut formula_bar = app.session.prefs.formula_bar;
+    if ui.checkbox(&mut formula_bar, lang.tr("Show formula bar")).changed() {
+        app.run_or_alert("view.formulaBar", json!({"on": formula_bar}));
+    }
+    ui.add_space(18.0);
+    section(ui, lang, "Options|Editing");
+    let mut autocomplete = app.ui.autocomplete;
+    if ui.checkbox(&mut autocomplete, lang.tr("Enable AutoComplete for cell values")).changed() {
+        app.run_or_alert("options.autoComplete", json!({"on": autocomplete}));
+    }
+    ui.add_space(18.0);
+    section(ui, lang, "Options|Save");
+    let mut autosave = app.ui.autosave;
+    if ui.checkbox(&mut autosave, lang.tr("Save .xlsx workbooks automatically after every change")).changed() {
+        app.toggle_autosave();
+    }
+    let Some(calc) = app.session.active().map(|d| d.wb.calc.clone()) else { return };
+    ui.add_space(18.0);
+    section(ui, lang, "Formulas");
+    ui.label(lang.tr("Workbook calculation"));
     use gridcraft_engine::model::CalcMode;
     for (mode, id, label) in [
         (CalcMode::Automatic, "automatic", "Automatic"),
@@ -1042,13 +1030,6 @@ fn calc_options(app: &mut SheetApp, ui: &mut Ui, lang: Language, calc: &gridcraf
         app.run_or_alert("formulas.calculationOptions", json!({"iterative": iterative}));
     }
     // Maximum Iterations and Maximum Change apply only while iteration is on, as in Excel.
-    iteration_options(app, ui, lang, calc, iterative);
-    // TODO: add "Set precision as displayed" here once `formulas.calculationOptions` takes
-    // `precisionAsDisplayed` (PR #1366); the model already stores it.
-}
-
-/// Maximum Iterations and Maximum Change, live only while iterative calculation is on.
-fn iteration_options(app: &mut SheetApp, ui: &mut Ui, lang: Language, calc: &gridcraft_engine::model::CalcSettings, iterative: bool) {
     ui.add_enabled_ui(iterative, |ui| {
         ui.horizontal(|ui| {
             ui.add_space(24.0);
@@ -1089,6 +1070,10 @@ fn iteration_options(app: &mut SheetApp, ui: &mut Ui, lang: Language, calc: &gri
             });
         });
     });
+    // TODO: add "Set precision as displayed" here once `formulas.calculationOptions` takes
+    // `precisionAsDisplayed` (PR #1366); the model already stores it.
+    ui.add_space(6.0);
+    dim(ui, lang.tr("Calculation settings are saved with the workbook."));
 }
 
 /// Refuses a typed setting with a message, leaving the workbook as it was. The Enter that

crates/ui-egui/src/code_editor.rs

@@ -78,32 +78,6 @@ pub fn highlight(text: &str, lang: Lang) -> Vec<(Range<usize>, Token)> {
     }
 }
 
-/// End (exclusive, in chars) of the Python string literal opening with quote `c` at char `i`.
-fn python_string_end(chars: &[(usize, char)], i: usize, c: char) -> usize {
-    let triple = chars.get(i + 1).is_some_and(|(_, d)| *d == c) && chars.get(i + 2).is_some_and(|(_, d)| *d == c);
-    let mut j = if triple { i + 3 } else { i + 1 };
-    loop {
-        match chars.get(j) {
-            None => break,
-            Some((_, '\\')) => j += 2,
-            Some((_, '\n')) if !triple => break,
-            Some((_, d)) if *d == c => {
-                if !triple {
-                    j += 1;
-                    break;
-                }
-                if chars.get(j + 1).is_some_and(|(_, d)| *d == c) && chars.get(j + 2).is_some_and(|(_, d)| *d == c) {
-                    j += 3;
-                    break;
-                }
-                j += 1;
-            }
-            Some(_) => j += 1,
-        }
-    }
-    j.min(chars.len())
-}
-
 fn python(text: &str) -> Vec<(Range<usize>, Token)> {
     let chars: Vec<(usize, char)> = text.char_indices().collect();
     let end_of = |i: usize| chars.get(i).map(|(b, _)| *b).unwrap_or(text.len());
@@ -118,7 +92,28 @@ fn python(text: &str) -> Vec<(Range<usize>, Token)> {
             out.push((start..end_of(j), Token::Comment));
             i = j;
         } else if c == '"' || c == '\'' {
-            let j = python_string_end(&chars, i, c);
+            let triple = chars.get(i + 1).is_some_and(|(_, d)| *d == c) && chars.get(i + 2).is_some_and(|(_, d)| *d == c);
+            let mut j = if triple { i + 3 } else { i + 1 };
+            loop {
+                match chars.get(j) {
+                    None => break,
+                    Some((_, '\\')) => j += 2,
+                    Some((_, '\n')) if !triple => break,
+                    Some((_, d)) if *d == c => {
+                        if !triple {
+                            j += 1;
+                            break;
+                        }
+                        if chars.get(j + 1).is_some_and(|(_, d)| *d == c) && chars.get(j + 2).is_some_and(|(_, d)| *d == c) {
+                            j += 3;
+                            break;
+                        }
+                        j += 1;
+                    }
+                    Some(_) => j += 1,
+                }
+            }
+            let j = j.min(chars.len());
             out.push((start..end_of(j), Token::String));
             i = j;
         } else if c.is_ascii_digit() || (c == '.' && chars.get(i + 1).is_some_and(|(_, d)| d.is_ascii_digit())) {

crates/ui-egui/src/outline.rs

@@ -165,35 +165,6 @@ impl Dir<'_> {
 }
 
 /// The band's buttons and brackets for this frame.
-/// The bracket for one group's detail, and its tick, on the lane `across`; `button` is the group's
-/// summary button when it is on screen.
-fn group_bracket(out: &mut Layout, dir: &Dir, grp: &OutlineGroup, button: Option<f32>, across: f32, side: f32) {
-    let first = dir.first_visible(grp.start, grp.end);
-    let Some((first_line, (a0, _))) = first else { return };
-    if grp.summary_before {
-        // From the button down (or across) to the last detail line, with the tick there.
-        let a0 = button.map_or(a0, |mid| mid + side / 2.0);
-        let end = dir.start(grp.end) + dir.size(grp.end);
-        let a1 = end.min(dir.hi);
-        if a1 <= a0 {
-            return;
-        }
-        let tick = (end <= dir.hi).then(|| [dir.point(a1 - 0.5, across), dir.point(a1 - 0.5, across + side / 2.0)]);
-        out.brackets.push(Bracket { line: [dir.point(a0, across), dir.point(a1 - 0.5, across)], tick });
-        return;
-    }
-    let a1 = match button {
-        Some(mid) => mid - side / 2.0,
-        None => dir.start(grp.summary()).min(dir.hi),
-    };
-    if a1 <= a0 {
-        return;
-    }
-    let start_shown = first_line == grp.start && (a0 - dir.start(grp.start)).abs() < 0.5;
-    let tick = start_shown.then(|| [dir.point(a0 + 0.5, across), dir.point(a0 + 0.5, across + side / 2.0)]);
-    out.brackets.push(Bracket { line: [dir.point(a0 + 0.5, across), dir.point(a1, across)], tick });
-}
-
 pub fn layout(geo: &Geo, sh: &Sheet) -> Layout {
     let mut out = Layout::default();
     let zoom = (geo.z / DISPLAY_SCALE).max(0.1);
@@ -241,7 +212,30 @@ pub fn layout(geo: &Geo, sh: &Sheet) -> Layout {
                 continue;
             }
             // The bracket, over the part of the detail that is on screen.
-            group_bracket(&mut out, dir, grp, button, across, side);
+            let first = dir.first_visible(grp.start, grp.end);
+            let Some((first_line, (a0, _))) = first else { continue };
+            if grp.summary_before {
+                // From the button down (or across) to the last detail line, with the tick there.
+                let a0 = button.map_or(a0, |mid| mid + side / 2.0);
+                let end = dir.start(grp.end) + dir.size(grp.end);
+                let a1 = end.min(dir.hi);
+                if a1 <= a0 {
+                    continue;
+                }
+                let tick = (end <= dir.hi).then(|| [dir.point(a1 - 0.5, across), dir.point(a1 - 0.5, across + side / 2.0)]);
+                out.brackets.push(Bracket { line: [dir.point(a0, across), dir.point(a1 - 0.5, across)], tick });
+                continue;
+            }
+            let a1 = match button {
+                Some(mid) => mid - side / 2.0,
+                None => dir.start(grp.summary()).min(dir.hi),
+            };
+            if a1 <= a0 {
+                continue;
+            }
+            let start_shown = first_line == grp.start && (a0 - dir.start(grp.start)).abs() < 0.5;
+            let tick = start_shown.then(|| [dir.point(a0 + 0.5, across), dir.point(a0 + 0.5, across + side / 2.0)]);
+            out.brackets.push(Bracket { line: [dir.point(a0 + 0.5, across), dir.point(a1, across)], tick });
         }
     }
     out

xtask/src/i18n_report.rs

@@ -116,55 +116,6 @@ pub fn catalog_keys(source: &str) -> BTreeSet<String> {
     keys
 }
 
-/// The character a `\u{...}` escape stands for, if it names a valid code point.
-fn unicode_escape(chars: &mut std::iter::Peekable<std::str::CharIndices<'_>>) -> Option<char> {
-    let mut hex = String::new();
-    for (_, c) in chars.by_ref() {
-        match c {
-            '}' => break,
-            '{' => {}
-            c => hex.push(c),
-        }
-    }
-    u32::from_str_radix(&hex, 16).ok().and_then(char::from_u32)
-}
-
-/// The value of a string literal whose opening quote was just read, and the byte offset past
-/// its closing quote (`len`, the source's length, when it is never closed).
-fn string_literal(chars: &mut std::iter::Peekable<std::str::CharIndices<'_>>, len: usize) -> (String, usize) {
-    let mut value = String::new();
-    let mut end = len;
-    while let Some((j, c)) = chars.next() {
-        match c {
-            '"' => {
-                end = j + 1;
-                break;
-            }
-            '\\' => match chars.next().map(|(_, c)| c) {
-                Some('n') => value.push('\n'),
-                Some('t') => value.push('\t'),
-                Some('r') => value.push('\r'),
-                Some('0') => value.push('\0'),
-                Some(c @ ('\\' | '"' | '\'')) => value.push(c),
-                Some('u') => {
-                    if let Some(c) = unicode_escape(chars) {
-                        value.push(c);
-                    }
-                }
-                // A line continuation skips the newline and the next line's indentation.
-                Some('\n') => {
-                    while chars.peek().is_some_and(|(_, c)| c.is_whitespace()) {
-                        chars.next();
-                    }
-                }
-                _ => {}
-            },
-            c => value.push(c),
-        }
-    }
-    (value, end)
-}
-
 /// Every string literal outside `//` comments: its decoded value, and the byte range from its
 /// opening quote to just past its closing one.
 fn literals(source: &str) -> Vec<(String, usize, usize)> {
@@ -182,7 +133,44 @@ fn literals(source: &str) -> Vec<(String, usize, usize)> {
         if c != '"' {
             continue;
         }
-        let (value, end) = string_literal(&mut chars, source.len());
+        let mut value = String::new();
+        let mut end = source.len();
+        while let Some((j, c)) = chars.next() {
+            match c {
+                '"' => {
+                    end = j + 1;
+                    break;
+                }
+                '\\' => match chars.next().map(|(_, c)| c) {
+                    Some('n') => value.push('\n'),
+                    Some('t') => value.push('\t'),
+                    Some('r') => value.push('\r'),
+                    Some('0') => value.push('\0'),
+                    Some(c @ ('\\' | '"' | '\'')) => value.push(c),
+                    Some('u') => {
+                        let mut hex = String::new();
+                        for (_, c) in chars.by_ref() {
+                            match c {
+                                '}' => break,
+                                '{' => {}
+                                c => hex.push(c),
+                            }
+                        }
+                        if let Some(c) = u32::from_str_radix(&hex, 16).ok().and_then(char::from_u32) {
+                            value.push(c);
+                        }
+                    }
+                    // A line continuation skips the newline and the next line's indentation.
+                    Some('\n') => {
+                        while chars.peek().is_some_and(|(_, c)| c.is_whitespace()) {
+                            chars.next();
+                        }
+                    }
+                    _ => {}
+                },
+                c => value.push(c),
+            }
+        }
         out.push((value, i, end));
     }
     out