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export const primitives = [
'string',
'number',
'boolean',
'bigint',
'undefined',
'null',
'symbol'
]
export const defaultKeywords: Keywords = {
_OR: '$or',
_AND: '$and',
_NOR: '$nor',
_ALL: '$all',
_IN: '$in',
_NIN: '$nin',
_EQ: '$eq',
_NE: '$ne',
_LT: '$lt',
_LTE: '$lte',
_GT: '$gt',
_GTE: '$gte',
// geo queries operators:
_GEO_INTERSECTS: '$geoIntersects',
_GEO_WITHIN: '$geoWithin',
_NEAR: '$near',
_NEAR_SPHERE: '$nearSphere',
// geo shapes operators:
_GEOMETRY: '$geometry',
_BOX: '$box',
_POLYGON: '$polygon',
_CENTER: '$center',
_CENTER_SPHERE: '$centerSphere',
_MAX_DISTANCE: '$maxDistance',
_MIN_DISTANCE: '$minDistance'
}
const defaultValues: Values = {}
export const isOperator = (key: string, keywords: object): boolean => {
return Object.keys(keywords).includes(key)
}
export const isPrimitive = (val): boolean => {
if (primitives.includes(typeof val)) return true
else return false
}
export const isComputable = (key: string, values: object): boolean => {
return Object.keys(values).includes(key)
}
export const isNested = (value, keywords: object, values: object): boolean => {
Iif (typeof value !== 'object') return false
let nested = false
for (const key in value) {
if (
!isOperator(key, keywords) &&
!isPrimitive(value[key]) &&
!isComputable(key, values)
) {
nested = true
break
}
}
return nested
}
export const computedValue = (parent: object, values: object) => {
for (const valueKey in values) {
if (parent[valueKey] !== undefined) {
return values[valueKey](parent)
}
}
}
export const argType = (
keywords: object,
values: object,
key?: string,
val?: string
): ArgType => {
if (isOperator(key, keywords)) return 'OPERATOR'
else if (isComputable(key, values)) return 'COMPUTED'
else if (isPrimitive(val)) return 'PRIMITIVE'
else if (Array.isArray(val)) return 'ARRAY'
else if (isNested(val, keywords, values)) return 'NESTED'
else Eif (typeof val === 'object') return 'FLAT'
else return null
}
const parseNested = (
keywords: Keywords,
values: Values,
key: string,
val,
lastResult = {}
) => {
if (isComputable(key, values)) {
return buildFilters(val, key, keywords, values)
}
let result = lastResult
for (const k in val) {
let isFinal = false
// COMPUTABLE VALUE
if (isComputable(k, values)) {
result = { ...result, ...buildFilters(val[k], k, keywords, values) }
return result
}
// OPERATOR
if (isOperator(k, keywords)) {
result = { ...result, [key]: buildFilters(val, key, keywords, values) }
return result
}
const subkey = key + '.' + k
const subval = val[k]
// subval is COMPUTABLE VALUE
if (isComputable(subkey, values)) {
result = { ...result, ...buildFilters(subval, subkey, keywords, values) }
isFinal = true
}
// subval is a PRIMITIVE
else if (isPrimitive(subval)) {
result[subkey] = buildFilters(subval, null, keywords, values)
isFinal = true
}
// subval is NESTED
else {
for (const sk in subval) {
const t = argType(keywords, values, sk, subval)
if (t !== 'NESTED' && t !== 'FLAT') {
result[subkey] = buildFilters(subval, null, keywords, values)
isFinal = true
break
}
}
}
if (!isFinal) parseNested(keywords, values, subkey, subval, result)
}
return result
}
export const buildFilters = (
args,
parentKey?: string,
Ikeywords: Keywords = {},
Ivalues: Values = {}
) => {
// PARENT IS A COMPUTABLE VALUE
if (isComputable(parentKey, values)) {
return computedValue({ [parentKey]: args }, values)
}
// NO PARENT AND ARGS IS A DIRECT VALUE
if (!parentKey && isPrimitive(args)) {
return args
}
// ELSE, ARGS MUST BE ON OBJECT. LET'S ITERATE:
let filters
for (const key in args) {
if (!filters) filters = {}
const val = args[key]
const t = argType(keywords, values, key, val)
// COMPUTED VALUE
if (isComputable(key, values)) {
const computed = buildFilters(val, key, keywords, values)
filters = {
...filters,
...computed
}
}
// OPERATOR
else if (t === 'OPERATOR') {
const keyword = keywords[key]
if (Array.isArray(val)) {
filters[keyword] = val.map(v => buildFilters(v, null, keywords, values))
} else {
filters[keyword] = buildFilters(val, null, keywords, values)
}
}
// NESTED QUERY
else if (t === 'NESTED' || t === 'FLAT') {
filters = { ...filters, ...parseNested(keywords, values, key, val) }
}
// ARRAY
else if (t === 'ARRAY') {
filters[key] = val.map(v => buildFilters(v, null, keywords, values))
}
// ELSE
else {
filters[key] = buildFilters(val, null, keywords, values)
}
}
return filters
}
export default (
IcustomKeywords: Keywords = {},
IcustomValues: Values = {},
Emerge: boolean = true
) => {
const keywords: Keywords = merge
? { ...defaultKeywords, ...customKeywords }
: customKeywords
const values: Values = merge ? { ...defaultValues, ...customValues } : customValues
return (args: object): object => buildFilters(args, null, keywords, values)
}
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