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visualization.js
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// -*- coding: utf-8 -*-
// ------------------------------------------------------------------------------------------------
// Copyright © 2022, stack-graphs authors.
// Licensed under either of Apache License, Version 2.0, or MIT license, at your option.
// Please see the LICENSE-APACHE or LICENSE-MIT files in this distribution for license details.
// ------------------------------------------------------------------------------------------------
'use strict';
class StackGraph {
static margin = 6;
static distx = 15;
static disty = 15;
static arrow_stem_w = 2;
static arrow_head_w = 16;
static arrow_head_h = 8;
static number_of_file_colors = 8;
constructor(container, graph, paths, metadata) {
this.metadata = metadata;
this.graph = graph;
this.paths = paths;
this.cleanup_data();
this.compute_data();
this.current_node = null;
this.current_edge = null;
this.current_orient = { y: "south", x: "east" };
this.paths_lock = null;
this.render();
}
cleanup_data() {
let idx = 0;
while (idx < this.graph.edges.length) {
let edge = this.graph.edges[idx];
if (edge.source.file === edge.sink.file && edge.source.local_id === edge.sink.local_id) {
console.log("ignoring self loop", edge);
this.graph.edges.splice(idx, 1);
} else {
idx += 1;
}
}
}
compute_data() {
this.F = {};
this.ID = {};
this.N = [];
this.compute_file_data();
this.compute_node_data();
this.compute_path_data();
}
compute_file_data() {
for (let i in graph.files) {
const file = graph.files[i];
this.F[file] = i;
}
}
compute_node_data() {
for (let i in graph.nodes) {
const node = graph.nodes[i];
node.paths = []
this.ID[this.node_to_id_str(node)] = i;
this.N.push(node);
}
}
compute_path_data() {
const jumps = {};
for (let path of this.paths) {
const node_ids = path.edges.map((e) => e.source);
node_ids.push(path.end_node);
const nodes = {};
const edges = {};
nodes[this.node_id_to_str(node_ids[0])] = {
stacks: [],
};
for (let i = 1; i < node_ids.length; i++) {
const source = node_ids[i - 1];
const sink = node_ids[i];
const edge_id = this.edge_to_id_str({ source, sink });
edges[edge_id] = {};
nodes[this.node_id_to_str(sink)] = {
stacks: [],
};
// create jump edges, which are not part of the graph
if (this.N[this.ID[this.node_id_to_str(source)]].type === 'jump_to_scope' && jumps[edge_id] !== true) {
jumps[edge_id] = true;
this.graph.edges.push({
precedence: 0,
source,
sink,
is_jump: true,
});
}
}
path.derived = { nodes, edges };
this.compute_path_stacks(path);
this.N[this.ID[this.node_id_to_str(path.start_node)]].paths.push(path);
}
}
compute_path_stacks(path) {
let symbol_stack = null;
let scope_stack = null;
var index = 0;
for (; index < path.edges.length; index++) {
const edge = path.edges[index];
const node_id = this.node_id_to_str(edge.source);
const node = this.N[this.ID[node_id]];
[symbol_stack, scope_stack] = this.compute_stacks_after_node(node, symbol_stack, scope_stack);
path.derived.nodes[node_id].stacks.push({
index,
symbol_stack,
scope_stack,
});
}
const node_id = this.node_id_to_str(path.end_node);
const node = this.N[this.ID[node_id]];
[symbol_stack, scope_stack] = this.compute_stacks_after_node(node, symbol_stack, scope_stack);
path.derived.nodes[node_id].stacks.push({
index,
symbol_stack,
scope_stack,
});
}
compute_stacks_after_node(node, symbol_stack, scope_stack) {
switch (node.type) {
case "drop_scopes":
scope_stack = null;
break;
case "jump_to_scope":
scope_stack = scope_stack?.tail;
break;
case "push_scoped_symbol":
const scopes = { scope: node.scope, tail: scope_stack };
symbol_stack = { symbol: node.symbol, scopes, tail: symbol_stack };
break;
case "push_symbol":
symbol_stack = { symbol: node.symbol, tail: symbol_stack };
break;
case "pop_scoped_symbol":
scope_stack = symbol_stack?.scopes;
symbol_stack = symbol_stack?.tail;
break;
case "pop_symbol":
symbol_stack = symbol_stack?.tail;
break;
case "root":
case "scope":
break;
default:
console.log("Unknown node type ", node.type);
break;
}
return [symbol_stack, scope_stack];
}
render() {
// define svg
const svg = container.append('svg')
.attr('width', '100%')
.attr('height', '100%');
const background = svg.append("rect")
.attr("class", "sg-background");
this.sg = svg.append('g').attr('class', 'sg');
// render UI
this.render_help();
this.render_tooltip();
this.render_legend();
this.render_graph();
// pan & zoom
let zoom = d3.zoom()
.on('start', (e) => {
background.classed("engaged", true);
}).on('zoom', (e) => {
this.sg.attr('transform', e.transform);
}).on('end', (e) => {
background.classed("engaged", false);
});
background.call(zoom);
// global key events
d3.select(window).on("keyup", (e) => {
this.paths_keypress(e);
this.tooltip_keypress(e);
this.help_keypress(e);
})
}
// ------------------------------------------------------------------------------------------------
// Node Rendering
//
render_graph() {
let that = this;
// clear out the graph
this.sg.selectAll('*').remove();
const edge_group = this.sg.append("g");
const node_group = this.sg.append("g");
const connect = d3.dagConnect()
.sourceId((edge) => this.ID[this.node_id_to_str(edge.source)])
.targetId((edge) => this.ID[this.node_id_to_str(edge.sink)])
.decycle(true);
const dag = connect(this.graph.edges);
// plot nodes
const nodes = node_group
.selectAll("g")
.data(dag.descendants())
.enter()
.append("g");
nodes.each(function (d, idx, gs) {
that.render_node(that.N[d.data.id], d3.select(this));
});
nodes.each(function (d, idx, gs) {
const bbox = this.getBBox({ fill: true, stroke: true });
d.width = bbox.width;
d.height = bbox.height;
});
const layout = d3.sugiyama()
.nodeSize((d) => {
return d === undefined ? [0, 0] : [d.width + 2 * StackGraph.distx, d.height + 2 * StackGraph.disty];
});
const { width, height } = layout(dag);
// set viewport
this.sg.attr("viewBox", [0, 0, width, height].join(" "));
// plot edges
const line = d3.line()
.curve(d3.curveCatmullRom)
.x((d) => d.x)
.y((d) => d.y);
const edges = edge_group
.selectAll("path")
.data(dag.links())
.enter()
.append("g")
.attr("class", (d) => `${d.data.is_jump ? "jump" : "edge"} ${this.edge_to_file_class(d.data)}`)
.attr("id", (d) => this.edge_to_id_str(d.data));
edges.append("path")
.attr("id", (d) => this.edge_to_id_str(d.data) + ":path")
.attr("d", (d) => line(d.reversed ? d3.reverse(d.points) : d.points))
let edge_labels = edges.append("text")
.append("textPath")
.attr("xlink:href", (d) => `#${this.edge_to_id_str(d.data)}:path`)
.attr("startOffset", "45%")
.text("➤");
// position nodes
nodes
.attr("transform", ({ x, y, width, height }) => `translate(${x + StackGraph.margin - width / 2}, ${y - StackGraph.margin + height / 2})`);
// node mouse events
nodes
.on("mouseover", (e, d) => {
const node = this.N[d.data.id];
this.current_node = node;
this.node_focus(node);
this.paths_mouseover(e, node);
this.tooltip_mouseover(e);
})
.on("mousemove", (e, d) => {
const node = this.N[d.data.id];
this.tooltip_mousemove(e);
})
.on("mouseout", (e, d) => {
const node = this.N[d.data.id];
this.current_node = null;
this.tooltip_mouseout(e);
this.paths_mouseout(e, node);
this.node_defocus(node);
})
.on("click", (e, d) => {
const node = this.N[d.data.id];
this.paths_click(e, node);
});
// edge mouse events
edge_labels
.on("mouseover", (e, d) => {
let edge = d.data;
this.current_edge = edge;
this.tooltip_mouseover(e);
})
.on("mousemove", (e, d) => {
let edge = d.data;
this.tooltip_mousemove(e);
})
.on("mouseout", (e, d) => {
let edge = d.data;
this.current_edge = null;
this.tooltip_mouseout(e);
});
}
render_node(node, g) {
g.attr('id', this.node_to_id_str(node));
g.attr('class', `node ${node.type} ${this.node_to_file_class(node)}`);
switch (node.type) {
case "drop_scopes":
this.render_symbol_node(g, "[drop]", null, "");
break;
case "jump_to_scope":
this.render_symbol_node(g, "[jump]", null, "");
break;
case "pop_symbol":
this.render_symbol_node(g, node.symbol, null, "pop");
if (node.is_definition) {
g.classed('definition', true);
}
break;
case "pop_scoped_symbol":
let pop_scope = { class: "pop_scope" };
this.render_symbol_node(g, node.symbol, pop_scope, "pop");
if (node.is_definition) {
g.classed('definition', true);
}
break;
case "push_symbol":
this.render_symbol_node(g, node.symbol, null, "push");
if (node.is_reference) {
g.classed('reference', true);
}
break;
case "push_scoped_symbol":
let push_scope = { class: "push_scope" };
this.render_symbol_node(g, node.symbol, push_scope, "push");
if (node.is_reference) {
g.classed('reference', true);
}
break;
case "root":
this.render_symbol_node(g, "[root]", null, "");
break;
case "scope":
if (this.show_all_node_labels()) {
let v = '';
let l = '';
for (let i = 0; i < node.debug_info.length; i++) {
let info = node.debug_info[i];
if (info.key == "tsg_variable") {
v = info.value;
} else if (info.key == "tsg_location") {
l = info.value
}
}
this.render_symbol_node(g, v + " " + l);
g.classed('plain_labeled_node', true);
} else {
this.render_scope(g);
}
if (node.is_exported) {
g.classed('exported', true);
}
break;
}
}
render_symbol_node(g, text, scope, shape) {
let content = g.append("g");
content.append('text').text(text);
let text_bbox = content.node().getBBox();
if (scope !== undefined && scope !== null) {
content.append("circle")
.attr("class", scope.class)
.attr("transform", `translate(${text_bbox.width + StackGraph.margin}, ${6 - text_bbox.height / 2})`);
content.append("circle")
.attr("class", scope.class + "-focus-point")
.attr("transform", `translate(${text_bbox.width + StackGraph.margin}, ${6 - text_bbox.height / 2})`);
}
let bbox = content.node().getBBox();
let l = bbox.x - StackGraph.margin,
r = bbox.x + bbox.width + StackGraph.margin,
t = bbox.y - StackGraph.margin,
b = bbox.y + bbox.height + StackGraph.margin;
var box_points;
var arrow_points = null;
switch (shape) {
case "pop":
box_points = `
${l},${t}
${r},${t}
${r},${b}
${l - StackGraph.arrow_stem_w},${b}
${l - StackGraph.arrow_stem_w},${t + StackGraph.arrow_head_h}
${l - StackGraph.arrow_head_w/2},${t + StackGraph.arrow_head_h}
`;
arrow_points = `
${l},${t}
${l + StackGraph.arrow_head_w/2},${t + StackGraph.arrow_head_h}
${l + StackGraph.arrow_stem_w},${t + StackGraph.arrow_head_h}
${l + StackGraph.arrow_stem_w},${b}
${l - StackGraph.arrow_stem_w},${b}
${l - StackGraph.arrow_stem_w},${t + StackGraph.arrow_head_h}
${l - StackGraph.arrow_head_w/2},${t + StackGraph.arrow_head_h}
`;
break;
case "push":
box_points = `
${l - StackGraph.arrow_stem_w},${t}
${r},${t}
${r},${b}
${l},${b}
${l - StackGraph.arrow_head_w/2},${b - StackGraph.arrow_head_h}
${l - StackGraph.arrow_stem_w},${b - StackGraph.arrow_head_h}
`;
arrow_points = `
${l - StackGraph.arrow_stem_w},${t}
${l + StackGraph.arrow_stem_w},${t}
${l + StackGraph.arrow_stem_w},${b - StackGraph.arrow_head_h}
${l + StackGraph.arrow_head_w/2},${b - StackGraph.arrow_head_h}
${l},${b}
${l - StackGraph.arrow_head_w/2},${b - StackGraph.arrow_head_h}
${l - StackGraph.arrow_stem_w},${b - StackGraph.arrow_head_h}
`;
break;
default:
box_points = `
${l},${t}
${r},${t}
${r},${b}
${l},${b}
`;
break;
}
if (arrow_points !== null) {
g.append('polygon').lower()
.attr("class", "arrow")
.attr('points', arrow_points);
}
g.append('polygon').lower()
.attr("class", "background")
.attr('points', box_points);
g.append('polygon').lower()
.attr("class", "border")
.attr('points', box_points);
}
render_scope(g) {
g.append('circle')
.attr("class", "border");
g.append('circle')
.attr("class", "background");
g.append('circle')
.attr("class", "focus-point");
}
// ------------------------------------------------------------------------------------------------
// Node Highlighting
//
node_focus(node) {
d3.select(this.id_selector(this.node_id_to_str(node.id)))
.classed("focus", true);
if (node.hasOwnProperty("scope")) {
d3.select(this.id_selector(this.node_id_to_str(node.scope)))
.classed("ref-focus", true);
}
}
node_defocus(node) {
d3.select(this.id_selector(this.node_id_to_str(node.id)))
.classed("focus", false);
if (node.hasOwnProperty("scope")) {
d3.select(this.id_selector(this.node_id_to_str(node.scope)))
.classed("ref-focus", false);
}
}
// ------------------------------------------------------------------------------------------------
// Path Highlighting
//
paths_mouseover(e, node) {
if (this.paths_lock !== null) {
return;
}
this.paths_highlight(node);
}
paths_mouseout(e, node) {
if (this.paths_lock !== null) {
return;
}
this.paths_nolight(node);
}
paths_click(e, node) {
if (this.paths_lock === null) {
if (node.paths.length > 0) {
this.paths_nolight(node);
this.paths_lock = { node, path: 0 };
this.paths_highlight(node, 0);
this.tooltip_update();
}
} else if (this.paths_lock.node === node) {
this.paths_nolight(node, this.paths_lock.path);
this.paths_lock.path += 1;
if (this.paths_lock.path >= node.paths.length) {
this.paths_lock = null;
this.paths_highlight(node);
} else {
this.paths_highlight(node, this.paths_lock.path);
}
this.tooltip_update();
}
}
paths_keypress(e) {
if (this.paths_lock !== null) {
if (e.keyCode === 27) {
this.paths_nolight(this.paths_lock.node);
this.node_defocus(this.paths_lock.node);
this.paths_lock = null;
if (this.current_node !== null) {
this.node_focus(this.current_node);
this.paths_highlight(this.current_node);
this.tooltip_update();
}
} else if (e.keyCode == 78) {
this.paths_nolight(this.paths_lock.node, this.paths_lock.path);
this.paths_lock.path += 1;
if (this.paths_lock.path >= this.paths_lock.node.paths.length) {
this.paths_lock.path = 0;
}
this.paths_highlight(this.paths_lock.node, this.paths_lock.path);
if (this.current_node !== null) {
this.tooltip_update();
}
}
}
}
paths_highlight(node, path) {
const paths = (path !== undefined) ? [node.paths[path]] : node.paths;
const nodes = {};
const edges = {};
for (let path of paths) {
for (let node_id in path.derived.nodes) {
if (!nodes.hasOwnProperty(node_id)) {
nodes[node_id] = false;
}
}
if (path.edges.length > 0) {
nodes[this.node_id_to_str(path.start_node)] = true;
nodes[this.node_id_to_str(path.end_node)] = true;
}
for (let edge_id in path.derived.edges) {
if (!edges.hasOwnProperty(edge_id)) {
edges[edge_id] = 0;
}
edges[edge_id] += 1;
}
for (let node_id in nodes) {
const g = d3.select(this.id_selector(node_id));
g.classed("path-node", true);
if (nodes[node_id]) {
g.classed("path-endpoint", true);
}
}
for (let edge_id in edges) {
const g = d3.select(this.id_selector(edge_id));
g.classed("path-edge", true);
}
}
}
paths_nolight(node, path) {
const paths = (path !== undefined) ? [node.paths[path]] : node.paths;
for (let path of paths) {
for (let node_id in path.derived.nodes) {
const g = d3.select(this.id_selector(node_id));
g.classed("path-node", false);
g.classed("path-endpoint", false);
}
for (let edge_id in path.derived.edges) {
const g = d3.select(this.id_selector(edge_id));
g.classed("path-edge", false);
}
}
}
// ------------------------------------------------------------------------------------------------
// Tooltip
//
render_tooltip() {
d3.select('body').append('div')
.attr('id', 'sg-tooltip')
.classed(this.tooltip_orient_class(), true);
}
tooltip_keypress(e) {
const old_class = this.tooltip_orient_class();
switch (e.keyCode) {
case 87: // w
this.current_orient.y = "north";
break;
case 65: // a
this.current_orient.x = "west";
break;
case 83: // s
this.current_orient.y = "south";
break;
case 68: // d
this.current_orient.x = "east";
break;
}
const new_class = this.tooltip_orient_class();
d3.select('#sg-tooltip')
.classed(old_class, false)
.classed(new_class, true);
}
tooltip_orient_class() {
return `${this.current_orient.y}-${this.current_orient.x}`;
}
tooltip_mousemove(e, node) {
d3.select('#sg-tooltip')
.style('left', `${e.pageX}px`)
.style('top', `${e.pageY}px`);
}
tooltip_mouseover(e) {
this.tooltip_update();
}
tooltip_mouseout(e) {
this.tooltip_update();
}
tooltip_update() {
const tooltip = d3.select('#sg-tooltip');
if (!this.tooltip_visible() || (this.current_node === null && this.current_edge === null)) {
tooltip.style('visibility', 'hidden');
return;
}
// clear
tooltip.selectAll("*").remove();
// create table
const tbody = tooltip.append("table")
.attr("class", "sg-tooltip-table")
.append("tbody");
function add_header(label) {
const tr = tbody.append("tr")
.attr("class", "sg-tooltip-header");
tr.append("td")
.attr("colspan", "2")
.text(label);
}
function add_sub_header(label) {
const tr = tbody.append("tr")
.attr("class", "sg-tooltip-sub-header");
tr.append("td")
.attr("colspan", "2")
.text(label);
}
function add_row(label, value) {
const tr = tbody.append("tr");
tr.append("td").attr("class", "sg-tooltip-label").text(label);
const td = tr.append("td").attr("class", "sg-tooltip-value")
if (Array.isArray(value)) {
const ul = td.append("ul").attr("class", "sg-tooltip-list");
for (let element of value) {
const li = ul.append("li").attr("class", "sg-tooltip-list-element");
if (Array.isArray(element)) {
const subvalue = element[0];
const sublist = element[1];
li.append("span").text(subvalue);
let sub_ul = li.append("ul").attr("class", "sg-tooltip-sublist");
for (let sub_element of sublist) {
sub_ul.append("li").attr("class", "sg-tooltip-sublist-element").text(sub_element);
}
} else {
li.text(element);
}
}
} else {
td.text(value);
}
}
let tooltip_methods = {
add_header,
add_sub_header,
add_row,
};
if (this.current_node != null) {
this.tooltip_node_update(tooltip_methods, this.current_node);
if (this.paths_lock !== null) {
this.tooltip_path_update(tooltip_methods, this.paths_lock);
}
tooltip.style('visibility', 'visible');
} else if (this.current_edge != null) {
this.tooltip_edge_update(tooltip_methods, this.current_edge);
if (this.paths_lock !== null) {
this.tooltip_path_update(tooltip_methods, this.paths_lock);
}
tooltip.style('visibility', 'visible');
}
}
tooltip_edge_update(tooltip, edge) {
tooltip.add_header("edge info");
tooltip.add_row("source", this.node_id_to_str(edge.source));
tooltip.add_row("sink", this.node_id_to_str(edge.sink));
if (edge.hasOwnProperty("precedence")) {
tooltip.add_row("precedence", edge.precedence);
}
if (edge.hasOwnProperty("debug_info") && edge.debug_info.length > 0) {
tooltip.add_header("debug info");
for (let { key, value } of edge.debug_info.sort((l, r) => l.key > r.key)) {
tooltip.add_row(key, value);
}
}
}
tooltip_node_update(tooltip, node) {
tooltip.add_header("node info");
tooltip.add_row("id", this.node_to_id_str(node));
tooltip.add_row("type", node.type);
if (node.hasOwnProperty("scope")) {
tooltip.add_row("scope", this.node_id_to_str(node.scope));
}
if (node.hasOwnProperty("is_reference")) {
tooltip.add_row("reference?", node.is_reference ? "yes" : "no");
}
if (node.hasOwnProperty("is_definition")) {
tooltip.add_row("definition?", node.is_definition ? "yes" : "no");
}
if (node.hasOwnProperty("is_exported")) {
tooltip.add_row("exported?", node.is_exported ? "yes" : "no");
}
if (this.node_has_source_info(node)) {
tooltip.add_row("location", this.source_info_to_str(node.source_info));
}
if (node.paths.length > 0) {
tooltip.add_row("outgoing paths", `${node.paths.length}`);
}
if (node.hasOwnProperty("debug_info") && node.debug_info.length > 0) {
tooltip.add_header("debug info");
for (let { key, value } of node.debug_info.sort((l, r) => l.key > r.key)) {
tooltip.add_row(key, value);
}
}
}
tooltip_path_update(tooltip, paths_lock) {
if (!this.tooltip_on_current_path(paths_lock)) {
return;
}
let path = paths_lock.node.paths[paths_lock.path];
tooltip.add_header("path info");
const path_count = `(path ${paths_lock.path + 1} of ${paths_lock.node.paths.length})`;
tooltip.add_row("start node", `${this.node_id_to_str(path.start_node)} ${path_count}`);
tooltip.add_row("end node", `${this.node_id_to_str(path.end_node)}`);
const node_id = (this.current_node && this.node_to_id_str(this.current_node))
|| (this.current_edge && this.node_id_to_str(this.current_edge.source));
const node_data = path.derived.nodes[node_id];
for (const { index, symbol_stack, scope_stack } of node_data.stacks) {
tooltip.add_sub_header(`position ${index}`);
tooltip.add_row("symbol stack", this.symbol_stack_to_array(symbol_stack));
tooltip.add_row("scope stack", this.scope_stack_to_array(scope_stack));
}
}
tooltip_on_current_path(paths_lock) {
let path = paths_lock.node.paths[paths_lock.path];
return (this.current_node !== null && path.derived.nodes.hasOwnProperty(this.node_to_id_str(this.current_node)))
|| (this.current_edge !== null && path.derived.edges.hasOwnProperty(this.edge_to_id_str(this.current_edge)));
}
// ------------------------------------------------------------------------------------------------
// Legend
//
render_legend() {
const legend = d3.select('body').append('div')
.attr('id', 'sg-legend')
legend.append("h1").text("Files");
const items = legend.append("ul");
items.append("li")
.classed("global", true)
.text("[global]");
for (const file in this.F) {
items.append("li")
.classed('file-' + this.F[file], true)
.text(file);
}
}
legend_update() {
const legend = d3.select('#sg-legend');
legend.style('visibility', this.show_file_legend() ? null : 'hidden');
}
// ------------------------------------------------------------------------------------------------
// Help
//
render_help() {
const help = d3.select('body').append('div');
help.append('label')
.attr('for', 'sg-help-toggle')
.attr('class', 'sg-help-label')
.text("ⓘ");
this.help_toggle = help.append('input')
.attr('id', 'sg-help-toggle')
.attr('type', 'checkbox');
const help_content = help.append('div')
.attr('class', 'sg-help-content');
help_content.append("h1").text("Graph");
help_content.append("p").html(`
Pan by dragging the background with the mouse.
Zoom using the scroll wheel.
`);
this.show_files_legend_toggle = this.new_setting(help_content, "sg-files-legend", "Show files legend (<kbd>f</kbd>)", true);
this.show_files_legend_toggle.on("change", (e => {
this.legend_update();
}));
this.show_all_node_labels_toggle = this.new_setting(help_content, "sg-scope-labels", "Show all node labels (<kbd>l</kbd>)", false);
this.show_all_node_labels_toggle.on("change", (e => {
this.render_graph();
}));
help_content.append("h1").text("Nodes & Edges");
help_content.append("p").html(`
Hover over nodes and edges to get a tooltip with detailed information.
Change the tooltip orientation using the keys <kbd>w</kbd> for above, <kbd>a</kbd> for left of, <kbd>s</kbd> for below, or <kbd>d</kbd> for right of the pointer.
`);
this.tooltip_toggle = this.new_setting(help_content, "sg-tooltip-visibility", "Show tooltip (<kbd>v</kbd>)", true);
this.tooltip_toggle.on("change", (e => {
this.tooltip_update();
}));
help_content.append("h1").text("Paths");
help_content.append("p").html(`
Cycle through individual paths by clicking on a node with outgoing paths.
While a path is selected, clicks to other nodes than the source node have no effect.
Cycle through selected paths using the key <kbd>n</kbd>.
Path selection ends after cycling through all paths by clicking the node, or by pressing the <kbd>esc</kbd> key.
`);
help_content.append("p").attr("class", "sg-help-meta").html(`
Toggle visibility of this help anytime by pressing <kbd>h</kbd>.
`);
const byline = help_content.append('div')
.attr("class", "sg-help-byline");
if (this.metadata?.version) {
byline.text(this.metadata.version);
}
}
help_keypress(e) {
switch (e.keyCode) {
case 70: // f
this.show_files_legend_toggle.property("checked", !this.show_files_legend_toggle.property("checked"));
this.legend_update();
break;
case 72: // h
this.help_toggle.property("checked", !this.help_toggle.property("checked"));
break;
case 76: // h
this.show_all_node_labels_toggle.property("checked", !this.show_all_node_labels_toggle.property("checked"));
this.render_graph();
break;
case 86: // v
this.tooltip_toggle.property("checked", !this.tooltip_visible());
this.tooltip_update();
break;
}
}
tooltip_visible() {
return this.tooltip_toggle.property("checked");
}
show_all_node_labels() {
return this.show_all_node_labels_toggle.property("checked");
}
show_file_legend() {
return this.show_files_legend_toggle.property("checked");
}
new_setting(element, id, html, initial) {
const toggle = element.append("div");
const toggle_input = toggle.append('input')
.attr('id', id)
.attr('type', 'checkbox')
.attr('class', 'sg-toggle-input')
.property('checked', initial);
toggle.append('label')
.attr('for', id)
.attr('class', 'sg-toggle-label')
.html(html);
return toggle_input;
}
// ------------------------------------------------------------------------------------------------
// Node & Edge IDs
//
node_to_id_str(node) {
return this.node_id_to_str(node.id);
}
node_to_file_class(node) {
return this.node_id_to_file_class(node.id);
}
edge_to_id_str(edge) {
return this.node_id_to_str(edge.source) + "->" + this.node_id_to_str(edge.sink);
}
edge_to_file_class(edge) {
if (edge.source.hasOwnProperty('file')) {
return "file-" + (this.F[edge.source.file] % StackGraph.number_of_file_colors);
} else if (edge.sink.hasOwnProperty('file')) {
return "file-" + (this.F[edge.sink.file] % StackGraph.number_of_file_colors);
} else {
return "global";
}
}
node_id_to_str(id) {
if (id.hasOwnProperty('file')) {
return id.file + "#" + id.local_id;
} else {
return "#" + id.local_id;
}
}
node_id_to_file_class(id) {
if (id.hasOwnProperty('file')) {
return "file-" + (this.F[id.file] % StackGraph.number_of_file_colors);
} else {
return "global";
}
}
id_selector(id) {
const sel = "#" + id.replaceAll(/[^a-zA-Z0-9]/g, '\\$&');
return sel;
}
// ------------------------------------------------------------------------------------------------
// Source Info
//
node_has_source_info(node) {
return node.hasOwnProperty("source_info")
&& !this.source_info_is_empty(node.source_info);
}
source_info_to_str(source_info) {
const line = source_info.span.start.line;
const column = source_info.span.start.column.grapheme_offset;
return `line ${line + 1} column ${column + 1}`;
}
source_info_is_empty(source_info) {
return source_info.span.start.line === 0
&& source_info.span.start.column.utf8_offset === 0
&& source_info.span.end.line === 0
&& source_info.span.end.column.utf8_offset === 0;
}
// ------------------------------------------------------------------------------------------------
// Stacks
//
symbol_stack_to_array(symbol_stack) {