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fpx.mjs
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fpx.mjs
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/** Fun **/
export function bind(fun, ...args) {return fun.bind(this, ...args)}
export function not(fun) {
req(fun, isFun)
return function not() {return !fun.apply(this, arguments)}
}
/** Bool **/
export function is(a, b) {return a === b || (isNaN(a) && isNaN(b))}
export function truthy(val) {return !!val}
export function falsy(val) {return !val}
export function isNil(val) {return val == null}
export function isSome(val) {return !isNil(val)}
export function isBool(val) {return typeof val === `boolean`}
export function isNum(val) {return typeof val === `number`}
export function isFin(val) {return isNum(val) && !isNaN(val) && !isInf(val)}
export function isFinNeg(val) {return isNum(val) && val < 0 && val > -Infinity}
export function isFinPos(val) {return isNum(val) && val > 0 && val < Infinity}
export function isInt(val) {return isNum(val) && ((val % 1) === 0)}
export function isNat(val) {return isInt(val) && val >= 0}
export function isIntNeg(val) {return isInt(val) && val < 0}
export function isIntPos(val) {return isInt(val) && val > 0}
export function isNaN(val) {return val !== val}
export function isInf(val) {return val === Infinity || val === -Infinity}
export function isBigInt(val) {return typeof val === `bigint`}
export function isStr(val) {return typeof val === `string`}
export function isSym(val) {return typeof val === `symbol`}
export function isKey(val) {return isPrim(val) && !isJunk(val)}
export function isJunk(val) {return isNil(val) || isNaN(val) || isInf(val)}
export function isComp(val) {return isObj(val) || isFun(val)}
export function isPrim(val) {return !isComp(val)}
export function isFun(val) {return typeof val === `function`}
export function isFunSync(val) {return isFunType(val, `Function`)}
export function isFunGen(val) {return isFunType(val, `GeneratorFunction`)}
export function isFunAsync(val) {return isFunType(val, `AsyncFunction`)}
export function isFunAsyncGen(val) {return isFunType(val, `AsyncGeneratorFunction`)}
export function isObj(val) {return val !== null && typeof val === `object`}
export function isStruct(val) {return isObj(val) && !isIter(val) && !isIterAsync(val)}
export function isArr(val) {return Array.isArray(val)}
export function isReg(val) {return isInst(val, RegExp)}
export function isDate(val) {return isInst(val, Date)}
export function isValidDate(val) {return isDate(val) && isFin(val.valueOf())}
export function isInvalidDate(val) {return isDate(val) && !isValidDate(val)}
export function isSet(val) {return isInst(val, Set)}
export function isMap(val) {return isInst(val, Map)}
export function isPromise(val) {return hasMeth(val, `then`)}
export function isIter(val) {return hasMeth(val, Symbol.iterator)}
export function isIterAsync(val) {return hasMeth(val, Symbol.asyncIterator)}
export function isIterator(val) {return isIter(val) && hasMeth(val, `next`)}
export function isIteratorAsync(val) {return isIterAsync(val) && hasMeth(val, `next`)}
export function isGen(val) {return isIterator(val) && hasMeth(val, `return`) && hasMeth(val, `throw`)}
export function isCls(val) {return isFun(val) && isObj(val.prototype)}
export function isDict(val) {return isObj(val) && isDictProto(Object.getPrototypeOf(val))}
export function isList(val) {return isArr(val) || (isIter(val) && isNat(getLength(val)))}
export function isSeq(val) {return isList(val) || isSet(val) || isIterator(val)}
function isDictProto(val) {return val === null || val === Object.prototype}
function isFunType(val, name) {return isFun(val) && val.constructor.name === name}
export function isInst(val, cls) {
req(cls, isCls)
return isObj(val) && val instanceof cls
}
export function hasMeth(val, key) {return isComp(val) && key in val && isFun(val[key])}
export function isListOf(val, fun) {
req(fun, isFun)
return isList(val) && every(val, fun)
}
export function isEmpty(val) {
if (!isObj(val)) return true
if (isList(val)) return val.length === 0
if (isIter(val)) return getSize(val) === 0
return false
}
export function isVac(val) {return !val || (isList(val) && every(val, isVac))}
function getLength(val) {return `length` in val ? val.length : undefined}
function getSize(val) {return `size` in val ? val.size : undefined}
/** Assert/Cast **/
export function req(val, fun) {
reqValidator(fun)
if (!fun(val)) {
throw TypeError(`expected ${show(val)} to satisfy test ${show(fun)}`)
}
return val
}
export function opt(val, fun) {
reqValidator(fun)
return isNil(val) ? val : req(val, fun)
}
function reqValidator(fun) {
if (!isFun(fun)) {
throw TypeError(`expected validator function, got ${show(fun)}`)
}
}
export function reqInst(val, cls) {
if (!isInst(val, cls)) {
const cons = isComp(val) ? val.constructor : undefined
throw TypeError(`expected ${show(val)}${cons ? ` (instance of ${show(cons)})` : ``} to be an instance of ${show(cls)}`)
}
return val
}
export function optInst(val, cls) {
req(cls, isCls)
return isNil(val) ? val : reqInst(val, cls)
}
export function only(val, fun) {return req(fun, isFun)(val) ? val : undefined}
export function arrOf(seq, fun) {
req(fun, isFun)
seq = arr(seq)
for (const elem of seq) req(elem, fun)
return seq
}
export function prim(val) {return isNil(val) ? val : req(val, isPrim)}
export function bool(val) {return isNil(val) ? false : req(val, isBool)}
export function num(val) {return isNil(val) ? 0 : req(val, isNum)}
export function fin(val) {return isNil(val) ? 0 : req(val, isFin)}
export function int(val) {return isNil(val) ? 0 : req(val, isInt)}
export function nat(val) {return isNil(val) ? 0 : req(val, isNat)}
export function intPos(val) {return isNil(val) ? 0 : req(val, isIntPos)}
export function str(val) {return isNil(val) ? `` : req(val, isStr)}
export function dict(val) {return isNil(val) ? npo() : req(val, isDict)}
export function struct(val) {return isNil(val) ? npo() : req(val, isStruct)}
export function inst(val, cls) {return isInst(val, cls) ? val : new cls(val)}
function errConvert(val, msg) {
return TypeError(`can't convert ${show(val)} to ${msg}`)
}
/** Ops **/
export function add(a, b) {return a + b}
export function sub(a, b) {return a - b}
export function mul(a, b) {return a * b}
export function div(a, b) {return a / b}
export function rem(a, b) {return a % b}
export function lt(a, b) {return a < b}
export function gt(a, b) {return a > b}
export function lte(a, b) {return a <= b}
export function gte(a, b) {return a >= b}
export function neg(val) {return -val}
export function inc(val) {return val + 1}
export function dec(val) {return val - 1}
/** Misc **/
export function nop() {}
export function True() {return true}
export function False() {return false}
export function id(val) {return val}
export function di(_, val) {return val}
export function val(value) {return function val() {return value}}
export function panic(val) {throw val}
export function jsonDecode(val) {return str(val) ? JSON.parse(val) : null}
export function jsonEncode(val) {return JSON.stringify(isNil(val) ? null : val)}
export function show(val) {
if (isStr(val) || isArr(val) || isDict(val) || (isComp(val) && !hasMeth(val, `toString`))) {
try {return JSON.stringify(val)} catch {}
}
return (isFun(val) && val.name) || String(val)
}
/** Struct **/
export function npo() {return Object.create(null)}
export function hasOwn(val, key) {
req(key, isKey)
return isComp(val) && Object.prototype.hasOwnProperty.call(val, key)
}
export function hasOwnEnum(val, key) {
req(key, isKey)
return isComp(val) && Object.prototype.propertyIsEnumerable.call(val, key)
}
export function mut(tar, src) {
req(tar, isStruct)
for (const key of structKeys(src)) {
if (!(key in tar) || hasOwnEnum(tar, key)) tar[key] = src[key]
}
return tar
}
export function mapDict(val, fun) {
req(fun, isFun)
const out = npo()
for (const key of structKeys(val)) out[key] = fun(val[key])
return out
}
export function pick(val, fun) {
req(fun, isFun)
const out = npo()
for (const key of structKeys(val)) {
const elem = val[key]
if (fun(elem)) out[key] = elem
}
return out
}
export function omit(val, fun) {return pick(val, not(fun))}
export function pickKeys(val, keys) {
val = struct(val)
const out = npo()
for (const key of values(keys)) if (hasOwnEnum(val, key)) out[key] = val[key]
return out
}
export function omitKeys(val, keys) {
val = struct(val)
keys = set(keys)
const out = npo()
for (const key of structKeys(val)) if (!keys.has(key)) out[key] = val[key]
return out
}
/** Iter **/
export function more(val) {return val.next().done === false}
export function alloc(len) {return Array(nat(len))}
export function arr(val) {return isArr(val) ? val : slice(val)}
export function arrCopy(val) {return maybeCopy(val, arr(val))}
function maybeCopy(src, out) {return is(src, out) ? reslice(out) : out}
function reslice(val) {return Array.prototype.slice.call(val)}
export function slice(val, start, next) {
opt(start, isInt)
opt(next, isInt)
if (isNil(val)) return []
if (isList(val)) return Array.prototype.slice.call(val, start, next)
if (isSet(val) || isIterator(val)) return values(val).slice(start, next)
throw errConvert(val, `array`)
}
export function keys(val) {
if (!isObj(val)) return []
if (isList(val)) return span(val.length)
if (isSet(val)) return copy(val, setValues)
if (isMap(val)) return copy(val, mapKeys)
if (isIterator(val)) return span(iterLen(val))
if (isIter(val) && hasMeth(val, `keys`)) return arr(val.keys())
if (isStruct(val)) return structKeys(val)
throw errConvert(val, `keys`)
}
// Doesn't prealloc because performance improvement would be minimal.
function copy(src, fun) {const out = []; fun(src, out); return out}
function setValues(src, out) {for (const elem of src) out.push(elem)}
function mapKeys(src, out) {for (const elem of src.keys()) out.push(elem)}
function structKeys(val) {return Object.keys(struct(val))}
export function values(val) {
if (!isObj(val)) return []
if (isArr(val)) return val
if (isList(val)) return Array.prototype.slice.call(val)
if (isSet(val)) return copy(val, setValues)
if (isMap(val)) return copy(val, mapValues)
if (isIterator(val)) return copy(val, iterValues)
if (isIter(val) && hasMeth(val, `values`)) return arr(val.values())
if (isStruct(val)) return structValues(val)
throw errConvert(val, `values`)
}
function mapValues(src, out) {for (const elem of src.values()) out.push(elem)}
function iterValues(src, out) {for (const elem of src) out.push(elem)}
// Like `Object.values` but much faster.
function structValues(src) {
const out = Object.keys(src)
let ind = -1
while (++ind < out.length) out[ind] = src[out[ind]]
return out
}
export function valuesCopy(val) {return maybeCopy(val, values(val))}
export function entries(val) {
if (!isObj(val)) return []
if (isArr(val)) return copy(val, arrEntries)
if (isList(val)) return copy(val, listEntries)
if (isSet(val)) return copy(val, setEntries)
if (isMap(val)) return copy(val, mapEntries)
if (isIterator(val)) return copy(val, iterEntries)
if (isIter(val) && hasMeth(val, `entries`)) return arr(val.entries())
if (isStruct(val)) return structEntries(val)
throw errConvert(val, `entries`)
}
function arrEntries(src, out, ind = -1) {for (const elem of src) out.push([++ind, elem])}
function listEntries(src, out, ind = -1) {for (const elem of src) out.push([++ind, elem])}
function setEntries(src, out) {for (const elem of src.entries()) out.push(elem)}
function mapEntries(src, out) {for (const elem of src.entries()) out.push(elem)}
function iterEntries(src, out, ind = -1) {for (const elem of src) out.push([++ind, elem])}
// Like `Object.entries` but much faster.
function structEntries(src) {
const out = Object.keys(src)
let ind = -1
while (++ind < out.length) out[ind] = [out[ind], src[out[ind]]]
return out
}
export function reify(val) {return hasIter(val) ? map(val, reify) : val}
function hasIter(val) {return isList(val) ? some(val, hasIter) : isIterator(val)}
export function vac(val) {return isVac(val) ? undefined : val}
export function indexOf(val, elem) {
if (opt(val, isList)) {
let ind = -1
while (++ind < val.length) if (is(val[ind], elem)) return ind
}
return -1
}
export function includes(val, elem) {return values(val).includes(elem)}
export function concat(one, two) {return values(one).concat(values(two))}
export function append(val, elem) {return values(val).concat([elem])}
export function prepend(val, elem) {return [elem].concat(values(val))}
export function len(val) {
if (!isObj(val)) return 0
if (isIter(val)) {
const len = getLength(val)
if (isNat(len)) return len
const size = getSize(val)
if (isNat(size)) return size
if (isIterator(val)) return iterLen(val)
return 0
}
if (isStruct(val)) return Object.keys(val).length
throw TypeError(`can't measure length of ${show(val)}`)
}
function iterLen(val) {
let out = 0
while (more(val)) out++
return out
}
export function hasLen(val) {return len(val) > 0}
export function each(val, fun) {
req(fun, isFun)
for (const elem of values(val)) fun(elem)
}
export function map(val, fun) {return mapMut(valuesCopy(val), fun)}
export function mapMut(val, fun) {
req(val, isArr)
req(fun, isFun)
let ind = -1
while (++ind < val.length) val[ind] = fun(val[ind])
return val
}
export function mapCompact(val, fun) {return compact(map(val, fun))}
export function filter(val, fun) {
req(fun, isFun)
const out = []
for (const elem of values(val)) if (fun(elem)) out.push(elem)
return out
}
export function reject(val, fun) {return filter(val, not(fun))}
export function compact(val) {
const out = []
for (const elem of values(val)) if (elem) out.push(elem)
return out
}
export function remove(src, val) {
return filter(src, function remove(elem) {return !is(val, elem)})
}
export function fold(val, acc, fun) {
req(fun, isFun)
for (const elem of values(val)) acc = fun(acc, elem)
return acc
}
export function find(val, fun) {
req(fun, isFun)
for (const elem of values(val)) if (fun(elem)) return elem
return undefined
}
export function procure(val, fun) {
req(fun, isFun)
for (let elem of values(val)) if ((elem = fun(elem))) return elem
return undefined
}
export function every(val, fun) {
req(fun, isFun)
for (const elem of values(val)) if (!fun(elem)) return false
return true
}
export function some(val, fun) {
req(fun, isFun)
for (const elem of values(val)) if (fun(elem)) return true
return false
}
export function head(val) {return values(val)[0]}
export function last(val) {return val = values(val), val[val.length - 1]}
export function init(val) {return values(val).slice(0, -1)}
export function tail(val) {return values(val).slice(1)}
export function take(val, len) {return values(val).slice(0, nat(len))}
export function count(val, fun) {
req(fun, isFun)
let out = 0
for (const elem of values(val)) if (fun(elem)) out++
return out
}
// https://tc39.github.io/ecma262/#sec-sortcompare
export function compare(one, two) {
if (one === undefined && two === undefined) return 0
if (one === undefined) return 1
if (two === undefined) return -1
one = String(one)
two = String(two)
if (one < two) return -1
if (two < one) return 1
return 0
}
export function compareFin(one, two) {
one = fin(one)
two = fin(two)
if (one < two) return -1
if (one > two) return 1
return 0
}
export function sort(val, fun) {return valuesCopy(val).sort(fun)}
export function reverse(val) {return valuesCopy(val).reverse()}
export function index(val, fun) {
req(fun, isFun)
const out = npo()
for (const elem of values(val)) {
const key = fun(elem)
if (isKey(key)) out[key] = elem
}
return out
}
export function group(src, fun) {
req(fun, isFun)
const out = npo()
for (const elem of values(src)) {
const key = fun(elem)
if (isKey(key)) (out[key] || (out[key] = [])).push(elem)
}
return out
}
export function partition(val, fun) {
req(fun, isFun)
const one = []
const two = []
for (const elem of values(val)) (fun(elem) ? one : two).push(elem)
return [one, two]
}
export function sum(val) {return fold(val, 0, addFin)}
function addFin(acc, val) {return onlyFin(acc) + onlyFin(val)}
function onlyFin(val) {return isFin(val) ? val : 0}
export function zip(src) {
const out = npo()
for (const [key, val] of values(src)) if (isKey(key)) out[key] = val
return out
}
export function mapFrom(...args) {
const out = new Map()
let ind = 0
while (ind < args.length) out.set(args[ind++], args[ind++])
return out
}
export function range(min, max) {
min = int(min)
max = int(max)
if (!(max >= min)) throw Error(`invalid range [${min},${max})`)
const out = alloc(max - min)
let ind = -1
while (++ind < out.length) out[ind] = min + ind
return out
}
export function span(len) {return range(0, nat(len))}
export function times(len, fun) {return mapMut(span(len), fun)}
export function repeat(len, val) {return alloc(len).fill(val)}
export function set(val) {return isSet(val) ? val : new Set(values(val))}
export function setCopy(val) {return new Set(values(val))}