X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/2d39b0e377c0896910ee49ae70082ba665faf986..ed1e77d3adeb83d26fd1dfb16dd84cabdcefd250:/tests/stress/rest-elements.js

diff --git a/tests/stress/rest-elements.js b/tests/stress/rest-elements.js
new file mode 100644
index 0000000..8c96d5c
--- /dev/null
+++ b/tests/stress/rest-elements.js
@@ -0,0 +1,223 @@
+function shouldBe(actual, expected) {
+    if (actual !== expected)
+        throw new Error('bad value: ' + actual);
+}
+
+function shouldThrow(func, errorMessage) {
+    var errorThrown = false;
+    var error = null;
+    try {
+        func();
+    } catch (e) {
+        errorThrown = true;
+        error = e;
+    }
+    if (!errorThrown)
+        throw new Error('not thrown');
+    if (String(error) !== errorMessage)
+        throw new Error(`bad error: ${String(error)}`);
+}
+
+function testSyntaxError(script, message) {
+    var error = null;
+    try {
+        eval(script);
+    } catch (e) {
+        error = e;
+    }
+    if (!error)
+        throw new Error("Expected syntax error not thrown");
+
+    if (String(error) !== message)
+        throw new Error("Bad error: " + String(error));
+}
+
+(function () {
+    var [a, b, ...c] = "Cocoa";
+    shouldBe(a, 'C');
+    shouldBe(b, 'o');
+    shouldBe(JSON.stringify(c), String.raw`["c","o","a"]`);
+}());
+
+(function () {
+    var [a, b, ...c] = "Co";
+    shouldBe(a, 'C');
+    shouldBe(b, 'o');
+    shouldBe(JSON.stringify(c), String.raw`[]`);
+}());
+
+(function () {
+    var [a, b, ...c] = "C";
+    shouldBe(a, 'C');
+    shouldBe(b, undefined);
+    shouldBe(JSON.stringify(c), String.raw`[]`);
+}());
+
+(function () {
+    var a, b, c;
+    [a, b, ...c] = "Cocoa";
+    shouldBe(a, 'C');
+    shouldBe(b, 'o');
+    shouldBe(JSON.stringify(c), String.raw`["c","o","a"]`);
+}());
+
+(function () {
+    var a, b, c;
+    [a, b, ...c] = "Co";
+    shouldBe(a, 'C');
+    shouldBe(b, 'o');
+    shouldBe(JSON.stringify(c), String.raw`[]`);
+}());
+
+(function () {
+    var a, b, c;
+    [a, b, ...c] = "C";
+    shouldBe(a, 'C');
+    shouldBe(b, undefined);
+    shouldBe(JSON.stringify(c), String.raw`[]`);
+}());
+
+(function ([a, b, ...c]) {
+    shouldBe(a, 'C');
+    shouldBe(b, 'o');
+    shouldBe(JSON.stringify(c), String.raw`["c","o","a"]`);
+}("Cocoa"));
+
+(function ([a, b, ...c]) {
+    shouldBe(a, 'C');
+    shouldBe(b, 'o');
+    shouldBe(JSON.stringify(c), String.raw`[]`);
+}("Co"));
+
+(function ([a, b, ...c]) {
+    shouldBe(a, 'C');
+    shouldBe(b, undefined);
+    shouldBe(JSON.stringify(c), String.raw`[]`);
+}("C"));
+
+testSyntaxError(String.raw`var [a, ...b, c] = 20`, String.raw`SyntaxError: Unexpected token ','. Expected a closing ']' following a rest element destructuring pattern.`);
+testSyntaxError(String.raw`var [a, ...b,] = 20`, String.raw`SyntaxError: Unexpected token ','. Expected a closing ']' following a rest element destructuring pattern.`);
+testSyntaxError(String.raw`var [a, ...b,,] = 20`, String.raw`SyntaxError: Unexpected token ','. Expected a closing ']' following a rest element destructuring pattern.`);
+testSyntaxError(String.raw`var [a, ...b = 20] = 20`, String.raw`SyntaxError: Unexpected token '='. Expected a closing ']' following a rest element destructuring pattern.`);
+testSyntaxError(String.raw`var [a, ...[b, c]] = 20`, String.raw`SyntaxError: Unexpected token ']'. Expected identifier for a rest element destructuring pattern.`);
+testSyntaxError(String.raw`var [a, ...{ b, c }] = 20`, String.raw`SyntaxError: Unexpected token ']'. Expected identifier for a rest element destructuring pattern.`);
+
+testSyntaxError(String.raw`(function ([a, ...b, c]) { })`, String.raw`SyntaxError: Unexpected token ','. Expected a closing ']' following a rest element destructuring pattern.`);
+testSyntaxError(String.raw`(function ([a, ...b,]) { })`, String.raw`SyntaxError: Unexpected token ','. Expected a closing ']' following a rest element destructuring pattern.`);
+testSyntaxError(String.raw`(function ([a, ...b,,]) { })`, String.raw`SyntaxError: Unexpected token ','. Expected a closing ']' following a rest element destructuring pattern.`);
+testSyntaxError(String.raw`(function ([a, ...b = 20,,]) { })`, String.raw`SyntaxError: Unexpected token '='. Expected a closing ']' following a rest element destructuring pattern.`);
+testSyntaxError(String.raw`(function ([a, ...[b, c]]) { })`, String.raw`SyntaxError: Unexpected token ']'. Expected identifier for a rest element destructuring pattern.`);
+testSyntaxError(String.raw`(function ([a, ...{ b, c }]) { })`, String.raw`SyntaxError: Unexpected token ']'. Expected identifier for a rest element destructuring pattern.`);
+
+shouldThrow(function () {
+    [a, ...b, c] = 20;
+}, "ReferenceError: Left side of assignment is not a reference.");
+
+shouldThrow(function () {
+    [a, ...b,] = 20
+}, "ReferenceError: Left side of assignment is not a reference.");
+
+shouldThrow(function () {
+    [a, ...b,,] = 20
+}, "ReferenceError: Left side of assignment is not a reference.");
+
+shouldThrow(function () {
+    [a, ...b = 20] = 20
+}, "ReferenceError: Left side of assignment is not a reference.");
+
+(function () {
+    var a, b, c;
+    [a, b, ...[...c]] = "Cocoa";
+    shouldBe(a, 'C');
+    shouldBe(b, 'o');
+    shouldBe(JSON.stringify(c), String.raw`["c","o","a"]`);
+}());
+
+(function () {
+    var a, b, c, d, e, f;
+    [a, b, ...{ 0: c, 1: d, 2: e, 3: f }] = "Cocoa";
+    shouldBe(a, 'C');
+    shouldBe(b, 'o');
+    shouldBe(c, 'c');
+    shouldBe(d, 'o');
+    shouldBe(f, undefined);
+}());
+
+(function () {
+    var a, b, c, d, e;
+    [a, b, ...[c, d, ...e]] = "Cocoa";
+    shouldBe(a, 'C');
+    shouldBe(b, 'o');
+    shouldBe(c, 'c');
+    shouldBe(d, 'o');
+    shouldBe(JSON.stringify(e), String.raw`["a"]`);
+}());
+
+function iterator(array) {
+    var nextCount = 0;
+    var returnCount = 0;
+    var original =  array.values();
+    return {
+        [Symbol.iterator]() {
+            return this;
+        },
+
+        next() {
+            ++nextCount;
+            return original.next();
+        },
+
+        return() {
+            ++returnCount;
+            return { done: true };
+        },
+
+        reportNext() {
+            return nextCount;
+        },
+
+        reportReturn() {
+            return returnCount;
+        }
+    };
+};
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [...a] = iter;
+    shouldBe(iter.reportNext(), 4);
+    shouldBe(iter.reportReturn(), 0);
+    shouldBe(JSON.stringify(a), String.raw`[1,2,3]`);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [a, b, ...c] = iter;
+    shouldBe(iter.reportNext(), 4);
+    shouldBe(iter.reportReturn(), 0);
+    shouldBe(a, 1);
+    shouldBe(b, 2);
+    shouldBe(JSON.stringify(c), String.raw`[3]`);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [a, b, c, d, ...e] = iter;
+    shouldBe(iter.reportNext(), 4);
+    shouldBe(iter.reportReturn(), 0);
+    shouldBe(a, 1);
+    shouldBe(b, 2);
+    shouldBe(c, 3);
+    shouldBe(d, undefined);
+    shouldBe(JSON.stringify(e), String.raw`[]`);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var a, b;
+    [...[a, b]] = iter;
+    shouldBe(iter.reportNext(), 4);
+    shouldBe(iter.reportReturn(), 0);
+    shouldBe(a, 1);
+    shouldBe(b, 2);
+}());