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import { nat } from './nat.js'; import { indexToMappedConstantMapperFor, indexToMappedConstantUnmapperFor, } from './_internals/mappers/IndexToMappedConstant.js'; import { Error } from '../utils/globals.js'; function computeNumChoices(options) { if (options.length === 0) throw new Error(`fc.mapToConstant expects at least one option`); let numChoices = 0; for (let idx = 0; idx !== options.length; ++idx) { if (options[idx].num < 0) throw new Error(`fc.mapToConstant expects all options to have a number of entries greater or equal to zero`); numChoices += options[idx].num; } if (numChoices === 0) throw new Error(`fc.mapToConstant expects at least one choice among options`); return numChoices; } export function mapToConstant(...entries) { const numChoices = computeNumChoices(entries); return nat({ max: numChoices - 1 }).map(indexToMappedConstantMapperFor(entries), indexToMappedConstantUnmapperFor(entries)); }