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assemble.ts
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assemble.ts
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import {Signal, SignalRef} from 'vega';
import {selector as parseSelector} from 'vega-event-selector';
import {identity, isArray, stringValue} from 'vega-util';
import {MODIFY, STORE, unitName, VL_SELECTION_RESOLVE, TUPLE, selectionCompilers} from '.';
import {dateTimeToExpr, isDateTime, dateTimeToTimestamp} from '../../datetime';
import {hasContinuousDomain} from '../../scale';
import {SelectionInit, SelectionInitInterval, SelectionExtent} from '../../selection';
import {keys, vals, varName} from '../../util';
import {VgData, VgDomain} from '../../vega.schema';
import {FacetModel} from '../facet';
import {LayerModel} from '../layer';
import {isUnitModel, Model} from '../model';
import {ScaleComponent} from '../scale/component';
import {UnitModel} from '../unit';
import {parseSelectionExtent} from './parse';
export function assembleInit(
init: readonly (SelectionInit | readonly SelectionInit[] | SelectionInitInterval)[] | SelectionInit,
isExpr = true,
wrap: (str: string | number) => string | number = identity
): any {
if (isArray(init)) {
const assembled = init.map(v => assembleInit(v, isExpr, wrap));
return isExpr ? `[${assembled.join(', ')}]` : assembled;
} else if (isDateTime(init)) {
if (isExpr) {
return wrap(dateTimeToExpr(init));
} else {
return wrap(dateTimeToTimestamp(init));
}
}
return isExpr ? wrap(JSON.stringify(init)) : init;
}
export function assembleUnitSelectionSignals(model: UnitModel, signals: Signal[]) {
for (const selCmpt of vals(model.component.selection ?? {})) {
const name = selCmpt.name;
let modifyExpr = `${name}${TUPLE}, ` + (selCmpt.resolve === 'global' ? 'true' : `{unit: ${unitName(model)}}`);
for (const c of selectionCompilers) {
if (!c.defined(selCmpt)) continue;
if (c.signals) signals = c.signals(model, selCmpt, signals);
if (c.modifyExpr) modifyExpr = c.modifyExpr(model, selCmpt, modifyExpr);
}
signals.push({
name: name + MODIFY,
on: [
{
events: {signal: selCmpt.name + TUPLE},
update: `modify(${stringValue(selCmpt.name + STORE)}, ${modifyExpr})`
}
]
});
}
return cleanupEmptyOnArray(signals);
}
export function assembleFacetSignals(model: FacetModel, signals: Signal[]) {
if (model.component.selection && keys(model.component.selection).length) {
const name = stringValue(model.getName('cell'));
signals.unshift({
name: 'facet',
value: {},
on: [
{
events: parseSelector('mousemove', 'scope'),
update: `isTuple(facet) ? facet : group(${name}).datum`
}
]
});
}
return cleanupEmptyOnArray(signals);
}
export function assembleTopLevelSignals(model: UnitModel, signals: Signal[]) {
let hasSelections = false;
for (const selCmpt of vals(model.component.selection ?? {})) {
const name = selCmpt.name;
const store = stringValue(name + STORE);
const hasSg = signals.filter(s => s.name === name);
if (hasSg.length === 0) {
const resolve = selCmpt.resolve === 'global' ? 'union' : selCmpt.resolve;
const isPoint = selCmpt.type === 'point' ? ', true)' : ')';
signals.push({
name: selCmpt.name,
update: `${VL_SELECTION_RESOLVE}(${store}, ${stringValue(resolve)}${isPoint}`
});
}
hasSelections = true;
for (const c of selectionCompilers) {
if (c.defined(selCmpt) && c.topLevelSignals) {
signals = c.topLevelSignals(model, selCmpt, signals);
}
}
}
if (hasSelections) {
const hasUnit = signals.filter(s => s.name === 'unit');
if (hasUnit.length === 0) {
signals.unshift({
name: 'unit',
value: {},
on: [{events: 'mousemove', update: 'isTuple(group()) ? group() : unit'}]
});
}
}
return cleanupEmptyOnArray(signals);
}
export function assembleUnitSelectionData(model: UnitModel, data: readonly VgData[]): VgData[] {
const dataCopy = [...data];
for (const selCmpt of vals(model.component.selection ?? {})) {
const init: VgData = {name: selCmpt.name + STORE};
if (selCmpt.init) {
const fields = selCmpt.project.items.map(proj => {
const {signals, ...rest} = proj;
return rest;
});
init.values = selCmpt.init.map(i => ({
unit: unitName(model, {escape: false}),
fields,
values: assembleInit(i, false)
}));
}
const contains = dataCopy.filter(d => d.name === selCmpt.name + STORE);
if (!contains.length) {
dataCopy.push(init);
}
}
return dataCopy;
}
export function assembleUnitSelectionMarks(model: UnitModel, marks: any[]): any[] {
for (const selCmpt of vals(model.component.selection ?? {})) {
for (const c of selectionCompilers) {
if (c.defined(selCmpt) && c.marks) {
marks = c.marks(model, selCmpt, marks);
}
}
}
return marks;
}
export function assembleLayerSelectionMarks(model: LayerModel, marks: any[]): any[] {
for (const child of model.children) {
if (isUnitModel(child)) {
marks = assembleUnitSelectionMarks(child, marks);
}
}
return marks;
}
export function assembleSelectionScaleDomain(
model: Model,
extent: SelectionExtent,
scaleCmpt: ScaleComponent,
domain: VgDomain
): SignalRef {
const name = extent.selection;
const selCmpt = model.getSelectionComponent(name, varName(name));
const parsedExtent = parseSelectionExtent(selCmpt, extent);
return {
signal:
hasContinuousDomain(scaleCmpt.get('type')) && isArray(domain) && domain[0] > domain[1]
? `isValid(${parsedExtent}) && reverse(${parsedExtent})`
: parsedExtent
};
}
function cleanupEmptyOnArray(signals: Signal[]) {
return signals.map(s => {
if (s.on && !s.on.length) delete s.on;
return s;
});
}