# All files / src builtins.js

100% Statements 63/63
97.06% Branches 33/34
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100% Lines 62/62

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     // @flow

    import combinations from 'combinations-generator'
    import { product } from 'cartesian-product-generator'
    import type { ObjectProjectionItemType } from './types'

    type ProjectableType = Array<mixed> & {[string]: mixed};
    type ProjectionRuleType = number & string;
    type ProjectionRulesType = Array<ProjectionRuleType>;
    type ProjectableObjectType = {
      [string]: ProjectableObjectType
    };

    const convertUndefined = (value: ?mixed): mixed | null =>
      value === undefined ? null : value

    const handleOptional = (value: ?mixed, f: mixed => mixed): mixed =>
      convertUndefined(value) === null ? null : f(value)

    const handleProjectionItem = (
      projectable: ProjectableType
    ): (ProjectionRuleType => mixed) => (
      projectionRule: ProjectionRuleType
    ): mixed =>
      Number.isInteger(projectionRule)
        ? convertUndefined(projectable.slice(projectionRule)[0])
        : Array.isArray(projectionRule)
          ? convertUndefined(projectable.slice(...projectionRule))
          : convertUndefined(projectable[projectionRule])

    const __objectProjection__ = (
      left: ProjectableObjectType,
      right: Array<ObjectProjectionItemType>,
      optional: boolean,
      _: Object
    ): mixed => {
      const newObject = {}
      right.forEach((rule: ObjectProjectionItemType) => {
        let key
        let finalKey
        if (rule.type === 'SimpleItem') {
          key = rule.value
          finalKey = rule.alias || key
          if (key in left) {
            newObject[finalKey] = left[key]
          } else {
            newObject[finalKey] = null
          }
        }

        if (rule.type === 'FragmentItem') {
          Object.assign(newObject, _[rule.value](left))
        }

        if (rule.type === 'RecursiveItem') {
          key = rule.name
          finalKey = rule.alias || key
          const rules = rule.value.value
          if (key in left) {
            newObject[finalKey] = __objectProjection__(left[key], rules, false, _)
          } else {
            newObject[finalKey] = null
          }
        }
      })

      return newObject
    }

    const handleProjection = (
      projectable: ProjectableType
    ): (ProjectionRulesType => Array<mixed> & mixed) => (
      projectionRules: ProjectionRulesType
    ): Array<mixed> & mixed =>
      projectionRules.map(handleProjectionItem(projectable))

    export default {
      objectify: (input: Array<[string, mixed]>): {[string]: mixed} =>
        input.reduce(function (
          a: {[string]: mixed},
          b: [string, mixed]
        ): {[string]: mixed} {
          a[b[0]] = b[1]
          return a
        },
        {}),

      __opt__: handleOptional,

      __spread__: (input: mixed): mixed =>
        Array.isArray(input)
          ? input
          : typeof input === 'string' || input instanceof String
            ? input.split('')
            : Object.entries(input),

      projection: (
        left: ProjectableType,
        right: ProjectionRulesType,
        optinal: boolean
      ): mixed =>
        right.length === 1
          ? handleOptional(left, (): mixed => handleProjection(left)(right)[0])
          : handleOptional(left, (): mixed => handleProjection(left)(right)),

      __objectProjection__,

      split: (separator: string): (string => Array<string>) => (
        input: string
      ): Array<string> => input.split(separator),

      join: (separator: string): ((Array<string>) => string) => (
        input: Array<string>
      ): string => input.join(separator),

      map: (f: mixed => mixed): ((Array<mixed>) => Array<mixed>) => (
        input: Array<mixed>
      ): Array<mixed> => input.map(f),

      sortBy: (f: <T>(mixed) => T): ((Array<mixed>) => Array<mixed>) => (
        input: Array<mixed>
      ): Array<mixed> =>
        input
          .slice()
          .sort(
            (a: mixed, b: mixed): 1 | 0 | -1 =>
              f(a) < f(b) ? -1 : f(a) > f(b) ? 1 : 0
          ),

      has: (
        key: string | number
      ): ((Array<mixed> | {[mixed]: mixed}) => boolean) => (
        input: Array<mixed> | {[mixed]: mixed}
      ): boolean => key in input,

      filter: (f: mixed => boolean): ((Array<mixed>) => Array<mixed>) => (
        input: Array<mixed>
      ): Array<mixed> => input.filter(f),

      get: function (variable: string): mixed {
        return this[variable]
      },

      assign: function (
        variable: string,
        value: mixed,
        context: {[string]: mixed}
      ): {[string]: mixed} {
        return Object.assign({}, context, { [variable]: value })
      },

      reverse: (input: Array<mixed>): Array<mixed> => input.slice().reverse(),

      reduce: ([f, x]: [(mixed) => mixed => mixed, mixed]): ((
        Array<mixed>,
      ) => mixed) => (input: Array<mixed>): mixed =>
        input.reduce((a: mixed, b: mixed): mixed => f(a)(b), x),

      length: (input: Array<mixed>): number => input.length,

      keys: (input: {[string]: mixed}): Array<string> => Object.keys(input),

      values: (input: {[string]: mixed}): Array<mixed> => Object.values(input),

      combinations: (r: number): Array<mixed> | (string => Array<Array<mixed>>) => (
        input: Array<mixed> | string
      ): Array<Array<mixed>> => Array.from(combinations(input, r)),

      product: (input: Array<mixed> | string): Array<Array<mixed>> =>
        Array.from(product(...input)),

      error: (message: string): (mixed => void) => (input: mixed) => {
        throw new Error(message)
      }
    }