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// SVG rendering and interaction. Layouts are cached by the playback controller.
class GraphView {
constructor(host) {
this.host = host;
this.comp = "";
this.pick = 0;
this.auto = true;
this.scene = null;
this.colors = {CTRL: "#b63838", DATA: "#536477", MEM: "#2867b2", ASSOC: "#9396a3", PARSER: "#7956a5"};
this.svg = d3.select(host).append("svg").attr("aria-label", "Compiler graph");
const defs = this.svg.append("defs");
for (const [role, color] of Object.entries(this.colors)) {
defs.append("marker").attr("id", "arrow-" + role)
.attr("viewBox", "0 -4 8 8").attr("refX", 8).attr("refY", 0)
.attr("markerWidth", 7).attr("markerHeight", 7).attr("orient", "auto-start-reverse")
.append("path").attr("d", "M0,-4L8,0L0,4Z").attr("fill", color);
}
this.world = this.svg.append("g");
this.links = this.world.append("g").attr("class", "edges");
this.parser = this.world.append("g").attr("class", "parser");
this.nodes = this.world.append("g").attr("class", "nodes");
this.zoom = d3.zoom().scaleExtent([.02, 4]).on("zoom", event => {
if (event.sourceEvent) this.auto = false;
this.world.attr("transform", event.transform);
});
this.svg.call(this.zoom).on("dblclick.zoom", null).on("click", () => this.select(0));
this.resize = new ResizeObserver(() => {
this.svg.attr("width", host.clientWidth).attr("height", host.clientHeight);
if (this.auto) this.fit();
});
this.resize.observe(host);
}
show(snap, scene, evt) {
if (this.comp !== snap.comp) {
this.comp = snap.comp;
this.pick = 0;
this.auto = true;
this.nodes.selectAll("*").remove();
this.links.selectAll("*").remove();
}
this.scene = scene;
this.evt = evt;
this.links.selectAll("path.edge").data(scene.edges, e => e.id).join("path")
.attr("class", e => "edge " + e.role).attr("id", e => e.id)
.attr("d", e => e.path).attr("stroke", e => this.colors[e.role])
.attr("marker-start", e => "url(#arrow-" + e.role + ")")
.each(function(e) {
d3.select(this).selectAll("title").data([e]).join("title")
.text(e.role === "PARSER" ? (e.scope ? `Parser holds ${e.active ? "active" : "saved"} scope #${e.def}` :
`Parser holds #${e.def}; no graph users yet`) :
`#${e.use}[${e.idx}] → #${e.def} · ${e.role}${e.label ? " · " + e.label : ""}`);
});
this.parser.selectAll("g").data(scene.parser ? [scene.parser] : []).join(enter => {
const g = enter.append("g");
g.append("rect").attr("rx", 6);
g.append("text").attr("class", "label").attr("text-anchor", "middle").attr("y", 22).text("Parser");
g.append("title").text("Display-only references to parser scopes and unfinished values; these are not compiler edges.");
return g;
}).attr("transform", p => `translate(${p.x},${p.y})`)
.each(function(p) {
d3.select(this).select("rect").attr("width", p.width).attr("height", p.height);
d3.select(this).selectAll("text").attr("x", p.width / 2);
});
const boxes = this.nodes.selectAll("g.node").data(scene.nodes, n => n.id).join(enter => {
const g = enter.append("g").attr("class", "node");
g.append("path").attr("class", "box");
g.append("text").attr("class", "head").attr("x", 8).attr("y", 15);
g.append("text").attr("class", "label").attr("text-anchor", "middle").attr("y", 33);
g.append("text").attr("class", "type").attr("text-anchor", "middle").attr("y", 51);
g.append("title");
return g;
});
boxes.attr("id", n => n.id).attr("data-id", n => n.n.id)
.classed("held", n => !!n.held)
.attr("transform", n => `translate(${n.x},${n.y})`)
.on("click", (event, n) => { event.stopPropagation(); this.select(n.n.id); });
boxes.select("path.box").attr("d", n => this.shape(n))
.attr("fill", n => ({CTRL: "#fff1c4", REGION: "#fff1c4", LOOP: "#ffe0ab", FUN: "#ffe0ab",
UNIT: "#ffe0ab", MEM: "#dcecff", PHI: "#f5e4fa", SCOPE: "#e5e0ff", DATA: "#edf3f7"})[n.n.kind]);
boxes.select("text.head").attr("y", n => n.scope ? 47 : 15)
.text(n => `#${n.n.id}${n.n.proj ? " · p" + n.n.proj.idx : ""}`);
boxes.select("text.label").attr("x", n => n.width / 2).attr("y", n => n.scope ? 51 : 33)
.text(n => n.label);
boxes.select("text.type").attr("x", n => n.width / 2).text(n => n.scope ? "" : n.type);
boxes.select("title").text(n => this.info(n.n));
boxes.each((n, i, groups) => {
const ports = n.ports.filter(p => p.id !== n.id + "o");
const group = d3.select(groups[i]);
group.selectAll("line.row").data(n.scope ? ports : [], p => p.id).join("line")
.attr("class", "row").attr("x1", (p, i) => i ? p.x + 3 - p.span / 2 : 0)
.attr("x2", (p, i) => i ? p.x + 3 - p.span / 2 : n.width)
.attr("y1", (p, i) => i ? 0 : 30).attr("y2", 30);
group.selectAll("text.bind").data(n.scope ? ports : [], p => p.id).join("text")
.attr("class", "bind").attr("x", p => p.x + 3).attr("y", 20).attr("text-anchor", "middle")
.text(p => p.edge.label || "[" + p.edge.idx + "]");
group.selectAll("circle.port").data(ports, p => p.id).join("circle")
.attr("class", "port").attr("cx", p => p.x + 3).attr("cy", p => p.y + 3)
.attr("r", 3).attr("fill", p => p.edge.def ? "#536477" : "white");
group.selectAll("text.slot").data(ports, p => p.id).join("text")
.attr("class", "slot").attr("x", p => p.x + 3).attr("y", p => p.y - 4)
.attr("text-anchor", "middle").text(p => p.edge.idx);
});
this.assocs(document.getElementById("assocs").checked);
this.mark();
this.select(this.pick);
if (this.auto) this.fit();
}
shape(n) {
const w = n.width, h = n.height;
// A MultiNode and its projection cells tile one rectangular box.
if (n.cell || n.n.kind === "CTRL" || n.n.kind === "UNIT") return `M0,0H${w}V${h}H0Z`;
if (n.n.kind === "REGION") return `M12,0H${w - 12}L${w},${h}H0Z`;
if (n.n.kind === "PHI") return `M12,0H${w - 12}L${w},${h / 2}L${w - 12},${h}H12L0,${h / 2}Z`;
if (n.n.kind === "MEM" || n.n.kind === "FUN")
return `M10,0H${w - 10}L${w},10V${h - 10}L${w - 10},${h}H10L0,${h - 10}V10Z`;
const r = n.n.kind === "LOOP" ? 24 : n.n.kind === "SCOPE" ? 4 : 14;
return `M${r},0H${w - r}Q${w},0 ${w},${r}V${h - r}Q${w},${h} ${w - r},${h}` +
`H${r}Q0,${h} 0,${h - r}V${r}Q0,0 ${r},0Z`;
}
info(n) {
return `#${n.id} ${n.label}${n.proj ? "\nProjection " + n.proj.idx + " of #" + n.proj.par : ""}` +
(this.scene.held.has(n.id) ? "\nHeld by parser; no graph users yet" : "") +
(this.scene.scopes.has(n.id) ? (this.scene.scope === n.id ? "\nActive parser scope" : "\nSaved parser scope") : "") +
`\n${n.type || "Type not computed"}\n\n` + n.edges.map(e =>
`[${e.idx}] → ${e.def ? "#" + e.def : "—"} ${e.role}${e.label ? " " + e.label : ""}`).join("\n");
}
select(id) {
this.pick = id;
const node = this.scene?.nodes.find(n => n.n.id === id);
this.nodes.selectAll("g.node").classed("selected", n => n.n.id === id);
this.links.selectAll("path.edge").classed("selected", e => id !== 0 && (e.use === id || e.def === id));
const detail = document.getElementById("detail");
detail.hidden = !id;
detail.textContent = node ? this.info(node.n) : `#${id} is absent in this frame.`;
}
assocs(show) { this.links.selectAll(".ASSOC").style("display", e => show || e.bind ? null : "none"); }
mark() {
const evt = this.evt;
const show = document.getElementById("near").checked;
const near = new Set(show ? evt?.near : []);
this.nodes.selectAll("g.node").classed("near", n => near.has(n.n.id))
.classed("focus", n => show && (n.n.id === evt?.node || n.n.id === evt?.repl));
}
// Save the whole graph at its layout size, independent of pan/zoom.
save(step) {
const svg = this.svg.node().cloneNode(true);
svg.setAttribute("xmlns", "http://www.w3.org/2000/svg");
svg.setAttribute("width", this.scene.width);
svg.setAttribute("height", this.scene.height);
svg.setAttribute("viewBox", `0 0 ${this.scene.width} ${this.scene.height}`);
svg.style.fontFamily = getComputedStyle(this.host).fontFamily;
svg.querySelector("g").removeAttribute("transform");
// Keep styles, markers and labels in the file; no viewer assets are needed.
const style = document.createElementNS(svg.namespaceURI, "style");
style.textContent = document.querySelector("style").textContent;
svg.prepend(style);
const bg = document.createElementNS(svg.namespaceURI, "rect");
bg.setAttribute("width", "100%"); bg.setAttribute("height", "100%");
bg.setAttribute("fill", getComputedStyle(this.host.parentElement).backgroundColor);
svg.insertBefore(bg, svg.querySelector("g"));
const blob = new Blob([new XMLSerializer().serializeToString(svg)], {type: "image/svg+xml"});
const url = URL.createObjectURL(blob);
const link = document.createElement("a");
link.href = url; link.download = `simple-${step}.svg`;
document.body.append(link);
link.click();
link.remove();
setTimeout(() => URL.revokeObjectURL(url), 1000);
}
fit() {
if (!this.scene || !this.host.clientWidth || !this.host.clientHeight) return;
const w = this.host.clientWidth, h = this.host.clientHeight;
const scale = Math.max(.02, Math.min(1.5, (w - 32) / this.scene.width, (h - 32) / this.scene.height));
this.svg.call(this.zoom.transform, d3.zoomIdentity
.translate((w - this.scene.width * scale) / 2, (h - this.scene.height * scale) / 2).scale(scale));
}
}
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