spread-call.js - mozsearch

load(libdir + "asserts.js");

load(libdir + "eqArrayHelper.js");

load(libdir + "iteration.js");

let makeCall    = farg => Function("f", "arg", "return f(" + farg + ");");

let makeFunCall = farg => Function("f", "arg", "return f.call(null, " + farg + ");");

let makeNew     = farg => Function("f", "arg", "return new f(" + farg + ").value;");

function checkCommon(f, makeFn) {

  assertEqArray(makeFn("...[1, 2, 3]")(f), [1, 2, 3]);

  assertEqArray(makeFn("1, ...[2], 3")(f), [1, 2, 3]);

  assertEqArray(makeFn("1, ...[2], ...[3]")(f), [1, 2, 3]);

  assertEqArray(makeFn("1, ...[2, 3]")(f), [1, 2, 3]);

  assertEqArray(makeFn("1, ...[], 2, 3")(f), [1, 2, 3]);

  // other iterable objects

  assertEqArray(makeFn("...arg")(f, new Int32Array([1, 2, 3])), [1, 2, 3]);

  assertEqArray(makeFn("...arg")(f, "abc"), ["a", "b", "c"]);

  assertEqArray(makeFn("...arg")(f, [1, 2, 3][Symbol.iterator]()), [1, 2, 3]);

  assertEqArray(makeFn("...arg")(f, new Set([1, 2, 3])), [1, 2, 3]);

  assertEqArray(makeFn("...arg")(f, new Map([["a", "A"], ["b", "B"], ["c", "C"]])).map(([k, v]) => k + v), ["aA", "bB", "cC"]);

  let itr = {};

  itr[Symbol.iterator] = function() {

      return {

          i: 1,

          next: function() {

              if (this.i < 4)

                  return { value: this.i++, done: false };

              else

                  return { value: undefined, done: true };

};

};

  assertEqArray(makeFn("...arg")(f, itr), [1, 2, 3]);

  function* gen() {

      for (let i = 1; i < 4; i ++)

          yield i;

  assertEqArray(makeFn("...arg")(f, gen()), [1, 2, 3]);

  assertEqArray(makeFn("...arg=[1, 2, 3]")(f), [1, 2, 3]);

  // 12.2.4.1.2 Runtime Semantics: ArrayAccumulation

  // If Type(spreadObj) is not Object, then throw a TypeError exception.

  assertThrowsInstanceOf(makeFn("1, ...null, 2, 3"), TypeError);

  assertThrowsInstanceOf(makeFn("1, ...undefined, 2, 3"), TypeError);

function checkNormal(f, makeFn) {

  checkCommon(f, makeFn);

  assertEqArray(makeFn("...[]")(f), [undefined, undefined, undefined]);

  assertEqArray(makeFn("...[1]")(f), [1, undefined, undefined]);

  assertEqArray(makeFn("...[1, 2]")(f), [1, 2, undefined]);

  assertEqArray(makeFn("...[1, 2, 3, 4]")(f), [1, 2, 3]);

  assertEqArray(makeFn("...[undefined]")(f), [undefined, undefined, undefined]);

checkNormal(function(a, b, c) { return [a, b, c]; }, makeCall);

checkNormal(function(a, b, c) { return [a, b, c]; }, makeFunCall);

checkNormal((a, b, c) => [a, b, c], makeCall);

checkNormal((a, b, c) => [a, b, c], makeFunCall);

function normalClass(a, b, c) {

  this.value = [a, b, c];

  assertEq(Object.getPrototypeOf(this), normalClass.prototype);

checkNormal(normalClass, makeNew);

function checkDefault(f, makeFn) {

  checkCommon(f, makeFn);

  assertEqArray(makeFn("...[]")(f), [-1, -2, -3]);

  assertEqArray(makeFn("...[1]")(f), [1, -2, -3]);

  assertEqArray(makeFn("...[1, 2]")(f), [1, 2, -3]);

  assertEqArray(makeFn("...[1, 2, 3, 4]")(f), [1, 2, 3]);

  assertEqArray(makeFn("...[undefined]")(f), [-1, -2, -3]);

checkDefault(function(a = -1, b = -2, c = -3) { return [a, b, c]; }, makeCall);

checkDefault(function(a = -1, b = -2, c = -3) { return [a, b, c]; }, makeFunCall);

checkDefault((a = -1, b = -2, c = -3) => [a, b, c], makeCall);

checkDefault((a = -1, b = -2, c = -3) => [a, b, c], makeFunCall);

function defaultClass(a = -1, b = -2, c = -3) {

  this.value = [a, b, c];

  assertEq(Object.getPrototypeOf(this), defaultClass.prototype);

checkDefault(defaultClass, makeNew);

function checkRest(f, makeFn) {

  checkCommon(f, makeFn);

  assertEqArray(makeFn("...[]")(f), []);

  assertEqArray(makeFn("1, ...[2, 3, 4], 5")(f), [1, 2, 3, 4, 5]);

  assertEqArray(makeFn("1, ...[], 2")(f), [1, 2]);

  assertEqArray(makeFn("1, ...[2, 3], 4, ...[5, 6]")(f), [1, 2, 3, 4, 5, 6]);

  assertEqArray(makeFn("...[undefined]")(f), [undefined]);

checkRest(function(...x) { return x; }, makeCall);

checkRest(function(...x) { return x; }, makeFunCall);

checkRest((...x) => x, makeCall);

checkRest((...x) => x, makeFunCall);

function restClass(...x) {

  this.value = x;

  assertEq(Object.getPrototypeOf(this), restClass.prototype);

checkRest(restClass, makeNew);