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parse.ts
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parse.ts
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import {parseSelector} from 'vega-event-selector';
import {array, isObject, isString, stringValue} from 'vega-util';
import {selectionCompilers, SelectionComponent, STORE} from '.';
import {warn} from '../../log';
import {BaseSelectionConfig, SelectionParameter, ParameterExtent} from '../../selection';
import {Dict, duplicate, entries, replacePathInField, varName} from '../../util';
import {DataFlowNode, OutputNode} from '../data/dataflow';
import {FilterNode} from '../data/filter';
import {Model} from '../model';
import {UnitModel} from '../unit';
import {DataSourceType} from '../../data';
import {ParameterPredicate} from '../../predicate';
export function parseUnitSelection(model: UnitModel, selDefs: SelectionParameter[]) {
const selCmpts: Dict<SelectionComponent<any /* this has to be "any" so typing won't fail in test files*/>> = {};
const selectionConfig = model.config.selection;
if (!selDefs || !selDefs.length) return selCmpts;
for (const def of selDefs) {
const name = varName(def.name);
const selDef = def.select;
const type = isString(selDef) ? selDef : selDef.type;
const defaults: BaseSelectionConfig = isObject(selDef) ? duplicate(selDef) : {type};
// Set default values from config if a property hasn't been specified,
// or if it is true. E.g., "translate": true should use the default
// event handlers for translate. However, true may be a valid value for
// a property (e.g., "nearest": true).
const cfg = selectionConfig[type];
for (const key in cfg) {
// Project transform applies its defaults.
if (key === 'fields' || key === 'encodings') {
continue;
}
if (key === 'mark') {
defaults[key] = {...cfg[key], ...defaults[key]};
}
if (defaults[key] === undefined || defaults[key] === true) {
defaults[key] = duplicate(cfg[key] ?? defaults[key]);
}
}
const selCmpt: SelectionComponent<any> = (selCmpts[name] = {
...defaults,
name,
type,
init: def.value,
bind: def.bind,
events: isString(defaults.on) ? parseSelector(defaults.on, 'scope') : array(duplicate(defaults.on))
} as any);
const def_ = duplicate(def); // defensive copy to prevent compilers from causing side effects
for (const c of selectionCompilers) {
if (c.defined(selCmpt) && c.parse) {
c.parse(model, selCmpt, def_);
}
}
}
return selCmpts;
}
export function parseSelectionPredicate(
model: Model,
pred: ParameterPredicate,
dfnode?: DataFlowNode,
datum = 'datum'
): string {
const name = isString(pred) ? pred : pred.param;
const vname = varName(name);
const store = stringValue(vname + STORE);
let selCmpt;
try {
selCmpt = model.getSelectionComponent(vname, name);
} catch (e) {
// If a selection isn't found, treat as a variable parameter and coerce to boolean.
return `!!${vname}`;
}
if (selCmpt.project.timeUnit) {
const child = dfnode ?? model.component.data.raw;
const tunode = selCmpt.project.timeUnit.clone();
if (child.parent) {
tunode.insertAsParentOf(child);
} else {
child.parent = tunode;
}
}
const fn = selCmpt.project.hasSelectionId ? 'vlSelectionIdTest(' : 'vlSelectionTest(';
const resolve = selCmpt.resolve === 'global' ? ')' : `, ${stringValue(selCmpt.resolve)})`;
const test = `${fn}${store}, ${datum}${resolve}`;
const length = `length(data(${store}))`;
return pred.empty === false ? `${length} && ${test}` : `!${length} || ${test}`;
}
export function parseSelectionExtent(model: Model, name: string, extent: ParameterExtent) {
const vname = varName(name);
const encoding = extent['encoding'];
let field = extent['field'];
let selCmpt;
try {
selCmpt = model.getSelectionComponent(vname, name);
} catch (e) {
// If a selection isn't found, treat it as a variable parameter.
return vname;
}
if (!encoding && !field) {
field = selCmpt.project.items[0].field;
if (selCmpt.project.items.length > 1) {
warn(
'A "field" or "encoding" must be specified when using a selection as a scale domain. ' +
`Using "field": ${stringValue(field)}.`
);
}
} else if (encoding && !field) {
const encodings = selCmpt.project.items.filter(p => p.channel === encoding);
if (!encodings.length || encodings.length > 1) {
field = selCmpt.project.items[0].field;
warn(
(!encodings.length ? 'No ' : 'Multiple ') +
`matching ${stringValue(encoding)} encoding found for selection ${stringValue(extent.param)}. ` +
`Using "field": ${stringValue(field)}.`
);
} else {
field = encodings[0].field;
}
}
return `${selCmpt.name}[${stringValue(replacePathInField(field))}]`;
}
export function materializeSelections(model: UnitModel, main: OutputNode) {
for (const [selection, selCmpt] of entries(model.component.selection ?? {})) {
const lookupName = model.getName(`lookup_${selection}`);
model.component.data.outputNodes[lookupName] = selCmpt.materialized = new OutputNode(
new FilterNode(main, model, {param: selection}),
lookupName,
DataSourceType.Lookup,
model.component.data.outputNodeRefCounts
);
}
}