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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)
}
}
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