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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>,
/// The template-input editor's text buffers (label / min / max / choices),
/// keyed by the field's hit key, held only while that field has focus.
template_fields: HashMap<String, String>,
}
impl Default for ExpressionsPanel {
fn default() -> Self {
Self::new()
}
}
impl ExpressionsPanel {
pub fn new() -> Self {
Self {
buf: String::new(),
hits: HashMap::new(),
template_fields: 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();
}
});
}
// --- a TEMPLATE's inputs: which expressions the insert prompt asks for --
if crate::document_class::is_template(state) {
ui.separator();
self.template_inputs(ui, state, &vars);
}
// --- 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 template-input editor (`.tbrep` only): one row per variable. Ticking
/// **Input** marks it as a value the insert prompt asks for; a marked input
/// takes an optional label, minimum, maximum and a fixed list of choices
/// (comma-separated). Every change is one undoable document edit (typing in
/// one field is one step).
fn template_inputs(&mut self, ui: &mut egui::Ui, state: &mut EngineState, vars: &[Value]) {
use crate::template::{apply_inputs, engine_inputs, TemplateInput};
ui.label(egui::RichText::new("Template inputs").strong());
ui.weak("Inserting this template asks for the ticked expressions and makes a new part with them.");
let mut inputs = engine_inputs(state);
let mut names: Vec<String> = vars
.iter()
.filter_map(|v| v.get("name").and_then(Value::as_str).map(str::to_string))
.collect();
for input in &inputs {
if !names.contains(&input.name) {
names.push(input.name.clone());
}
}
if names.is_empty() {
ui.weak("(define expressions above to mark them as inputs)");
return;
}
let mut changed: Option<Option<String>> = None;
// One block per expression: the tick and the name, and under a ticked
// one its four fields, label beside field — a six-column grid does not
// fit the pane's width.
for name in &names {
let index = inputs.iter().position(|input| input.name == *name);
let mut marked = index.is_some();
let defined = vars.iter().any(|v| v.get("name").and_then(Value::as_str) == Some(name));
ui.horizontal(|ui| {
let tick = ui.checkbox(&mut marked, "");
self.hits.insert(format!("expr:tinput:{name}"), tick.rect);
if tick.changed() {
match index {
Some(index) => {
inputs.remove(index);
}
None => inputs.push(TemplateInput { name: name.clone(), ..TemplateInput::default() }),
}
changed = Some(None);
}
ui.monospace(name);
if !defined {
ui.weak("(not defined)");
} else if marked {
ui.weak("input");
}
});
let Some(index) = inputs.iter().position(|input| input.name == *name) else {
continue;
};
let input = &mut inputs[index];
let fmt = |value: Option<f64>| value.map(|v| v.to_string()).unwrap_or_default();
let fields: [(&str, &str, String, &str); 4] = [
("tlabel", "Label", input.label.clone(), name.as_str()),
("tmin", "Min", fmt(input.min), "no limit"),
("tmax", "Max", fmt(input.max), "no limit"),
("tchoices", "Choices", input.choices.join(", "), "any value (or: 2, 3, 5)"),
];
ui.indent(format!("tinput-{name}"), |ui| {
egui::Grid::new(format!("tinput-grid-{name}")).num_columns(2).show(ui, |ui| {
for (field, caption, current, hint) in fields {
ui.weak(caption);
let key = format!("expr:{field}:{name}");
let mut text = self.template_fields.get(&key).cloned().unwrap_or(current);
let edit = ui.add(
egui::TextEdit::singleline(&mut text)
.hint_text(hint)
.desired_width(ui.available_width().min(220.0)),
);
self.hits.insert(key.clone(), edit.rect);
ui.end_row();
if edit.changed() {
let applied = match field {
"tlabel" => {
input.label = text.clone();
true
}
"tmin" | "tmax" => {
let parsed = if text.trim().is_empty() {
Some(None)
} else {
text.trim().parse::<f64>().ok().filter(|v| v.is_finite()).map(Some)
};
match parsed {
Some(value) if field == "tmin" => {
input.min = value;
true
}
Some(value) => {
input.max = value;
true
}
None => false,
}
}
_ => {
input.choices = text
.split(',')
.map(str::trim)
.filter(|choice| !choice.is_empty())
.map(str::to_string)
.collect();
true
}
};
if applied {
changed = Some(Some(key.clone()));
}
}
if edit.has_focus() {
self.template_fields.insert(key, text);
} else {
self.template_fields.remove(&key);
}
}
});
});
}
if let Some(coalesce) = changed {
apply_inputs(state, &inputs, coalesce.as_deref());
}
}
/// 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)
}
/// Drop the published rects: the dock calls this for a pane it did not
/// draw this frame (`DockState::ui`), whose widgets are not on screen.
pub fn clear_hits(&mut self) {
self.hits.clear();
}
}
/// 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 },
HitKeyDoc { panel: "expr", prefix: "expr:tinput:", meaning: "a template's input tick (expr:tinput:<expression name>), shown while editing a .tbrep", command: None },
HitKeyDoc { panel: "expr", prefix: "expr:tlabel:", meaning: "a marked template input's label field", command: None },
HitKeyDoc { panel: "expr", prefix: "expr:tmin:", meaning: "a marked template input's minimum field", command: None },
HitKeyDoc { panel: "expr", prefix: "expr:tmax:", meaning: "a marked template input's maximum field", command: None },
HitKeyDoc { panel: "expr", prefix: "expr:tchoices:", meaning: "a marked template input's choices field (comma-separated)", command: None },
];