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//! Expressions / parameters panel — the **variable sheet** that drives feature
//! params. The engine-owned history document carries an `expressions` source
//! string (a small `name = expr;` DSL) plus a `configurator` object; the pipeline
//! evaluates it when running features, so a numeric feature field may be the
//! expression string `"boxW"` — resolved against the variables defined here.
//!
//! Following the panel pattern, this owns NO model state: it edits + reads the
//! engine (`state.expressions_json()` / `state.set_expressions()` /
//! `state.expression_variables_json()` / `state.configurator_json()`), which write
//! into the single-source-of-truth `EngineState.history` and re-run the rolled-to
//! prefix so var-referencing params update live. The panel holds only a transient
//! editor buffer (mirrored from the engine when unfocused, committed on
//! Apply / focus-loss) and the per-frame widget hit-rects the headed verifier reads.
use crate::automation::hit_keys::HitKeyDoc;
use brep_render::engine_state::EngineState;
use eframe::egui;
use serde_json::Value;
use std::collections::HashMap;
/// The expressions panel's transient UI state (the model lives in the engine).
pub struct ExpressionsPanel {
/// The multiline editor buffer. Mirrored from the engine's `expressions`
/// whenever the editor is UNFOCUSED (so an Open / undo / redo that changed the
/// document reflects here), and committed BACK to the engine on Apply or when
/// the editor loses focus.
buf: String,
/// Per-frame widget hit-rects, published to JS for the headed verifier (wasm).
hits: HashMap<String, egui::Rect>,
}
impl Default for ExpressionsPanel {
fn default() -> Self {
Self::new()
}
}
impl ExpressionsPanel {
pub fn new() -> Self {
Self {
buf: String::new(),
hits: HashMap::new(),
}
}
/// Draw the panel under its own collapsing header (matches the sibling panels).
pub fn show(&mut self, ui: &mut egui::Ui, state: &mut EngineState) {
self.hits.clear();
egui::CollapsingHeader::new("Expressions / parameters")
.id_salt("expressions-panel")
.default_open(true)
.show(ui, |ui| self.body(ui, state));
}
fn body(&mut self, ui: &mut egui::Ui, state: &mut EngineState) {
ui.label("Variable sheet — feature params may reference these (e.g. a size field set to `boxW`).");
// --- the editor, bound to the engine-owned `expressions` source --------
// Syntax highlighting via egui's BUILT-IN facility
// (`egui_extras::syntax_highlighting`). A `layouter` re-lays every
// frame: `highlight(...)` returns a colored `LayoutJob`, and the theme
// is read from egui memory so it tracks the light/dark visuals. Results
// are memoized inside `highlight`, so this is cheap per-frame.
//
// The language is `"c"`, not `"js"`. We build egui_extras WITHOUT its
// `syntect` feature (16 crates natively, 20 on wasm, for this one
// call), so `highlight` runs the crate's own fallback lexer, whose
// `Language::new` knows only c/cpp, py, rust and toml — `"js"` returns
// None there and falls through to unstyled monospace. The sheet is
// `name = expr;` lines, so the C lane colours exactly what matters:
// `//` comments, strings, numbers, identifiers and punctuation.
let mut layouter = |ui: &egui::Ui, buf: &dyn egui::TextBuffer, wrap_width: f32| {
let theme =
egui_extras::syntax_highlighting::CodeTheme::from_memory(ui.ctx(), ui.style());
let mut job = egui_extras::syntax_highlighting::highlight(
ui.ctx(),
ui.style(),
&theme,
buf.as_str(),
"c",
);
job.wrap.max_width = wrap_width;
ui.fonts_mut(|f| f.layout_job(job))
};
let editor = ui.add(
egui::TextEdit::multiline(&mut self.buf)
.id_salt("expressions-editor")
.code_editor()
.desired_rows(5)
.desired_width(f32::INFINITY)
.hint_text("boxW = 30;\nboxH = boxW / 2;")
.layouter(&mut layouter),
);
self.hits.insert("expr:editor".into(), editor.rect);
// --- commit: Apply button OR focus-loss; re-run only when text changed --
let apply = ui.button("Apply (re-run history)");
self.hits.insert("expr:apply".into(), apply.rect);
let commit = editor.lost_focus() || apply.clicked();
if commit {
// Re-run only on a real change (each commit re-runs the rolled-to
// prefix); a no-op commit must not thrash the kernel.
if self.buf != state.expressions_json() {
let _ = state.set_expressions(&self.buf);
}
} else if !editor.has_focus() {
// Not editing → mirror the engine (an Open / New / undo / redo may have
// replaced the document out from under the buffer).
self.buf = state.expressions_json();
}
// --- parsed variable list (name = defining expression) -----------------
ui.separator();
ui.label(egui::RichText::new("Variables").strong());
let vars: Vec<Value> =
serde_json::from_str(&state.expression_variables_json()).unwrap_or_default();
if vars.is_empty() {
ui.weak("(no variables defined)");
} else {
egui::Grid::new("expr-vars")
.num_columns(2)
.striped(true)
.show(ui, |ui| {
for v in &vars {
let name = v.get("name").and_then(Value::as_str).unwrap_or("");
let expr = v.get("expr").and_then(Value::as_str).unwrap_or("");
ui.monospace(name);
ui.monospace(format!("= {expr}"));
ui.end_row();
}
});
}
// --- configurator (typed named inputs) — read/display; editing deferred -
ui.separator();
ui.collapsing("Configurator (read-only)", |ui| {
let cfg = state.configurator_json();
let pretty = serde_json::from_str::<Value>(&cfg)
.and_then(|v| serde_json::to_string_pretty(&v))
.unwrap_or(cfg);
ui.monospace(pretty);
ui.weak("Typed named inputs — a deeper configurator editor is deferred.");
});
}
/// The published widget hit-rects (egui points) for the headed verifier.
pub fn hits_json(&self) -> String {
crate::automation::hit_rects::hits_json(&self.hits)
}
}
// BREP private tests: 218eadaab7b230b7
/// The hit keys this panel publishes (see `automation::hit_keys`).
pub static HIT_KEYS: &[HitKeyDoc] = &[
HitKeyDoc { panel: "expr", prefix: "expr:editor", meaning: "the expressions script editor", command: None },
HitKeyDoc { panel: "expr", prefix: "expr:apply", meaning: "apply the script and rerun", command: None },
];