Sandbox::https://github.com/arogyad/function-plot/blob/master/src/datum-validation.ts

Repository navigation

import { FunctionPlotDatum } from './types.js'

import { assert } from './utils.mjs'

export default function datumValidation(d: FunctionPlotDatum) {

validateGraphType(d)

validateFnType(d)

}

function validateGraphType(d: FunctionPlotDatum) {

// defaulted to 'interval' in datumDefaults.

assert('graphType' in d, `graphType isn't defined`)

}

function validateFnType(d: FunctionPlotDatum) {

const invalid = `invalid option fnType=${d.fnType} with graphType=${d.graphType}`

if (d.fnType === 'linear') {

assert(d.graphType === 'polyline' || d.graphType === 'interval' || d.graphType === 'scatter', invalid)

}

if (d.fnType === 'parametric' || d.fnType === 'polar' || d.fnType === 'vector') {

assert(d.graphType === 'polyline', invalid)

}

if (d.fnType === 'points') {

assert(d.graphType === 'polyline' || d.graphType === 'scatter', invalid)

}

if (d.fnType === 'implicit') {

assert(d.graphType === 'interval', invalid)

}