JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / tests / stress / trailing-comma-in-patterns.js

diff --git a/tests/stress/trailing-comma-in-patterns.js b/tests/stress/trailing-comma-in-patterns.js
new file mode 100644 (file)
index 0000000..7353e90
--- /dev/null
+++ b/tests/stress/trailing-comma-in-patterns.js
@@ -0,0 +1,157 @@
+function shouldBe(actual, expected) {
+    if (actual !== expected)
+        throw new Error('bad value: ' + actual);
+}
+
+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 [] = iter;
+    shouldBe(iter.reportNext(), 0);
+    shouldBe(iter.reportReturn(), 1);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [,] = iter;
+    shouldBe(iter.reportNext(), 1);
+    shouldBe(iter.reportReturn(), 1);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [,,] = iter;
+    shouldBe(iter.reportNext(), 2);
+    shouldBe(iter.reportReturn(), 1);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [,,,] = iter;
+    shouldBe(iter.reportNext(), 3);
+    shouldBe(iter.reportReturn(), 1);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [,,,,] = iter;
+    shouldBe(iter.reportNext(), 4);
+    shouldBe(iter.reportReturn(), 0);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [,,,,,] = iter;
+    shouldBe(iter.reportNext(), 4);
+    shouldBe(iter.reportReturn(), 0);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [,a,] = iter;
+    shouldBe(iter.reportNext(), 2);
+    shouldBe(iter.reportReturn(), 1);
+    shouldBe(a, 2);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [a,] = iter;
+    shouldBe(iter.reportNext(), 1);
+    shouldBe(iter.reportReturn(), 1);
+    shouldBe(a, 1);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [a,,] = iter;
+    shouldBe(iter.reportNext(), 2);
+    shouldBe(iter.reportReturn(), 1);
+    shouldBe(a, 1);
+}());
+
+(function () {
+    var iter = iterator([1, 2, 3]);
+    var [a,b = 42,] = iter;
+    shouldBe(iter.reportNext(), 2);
+    shouldBe(iter.reportReturn(), 1);
+    shouldBe(a, 1);
+    shouldBe(b, 2);
+}());
+
+(function () {
+    var {} = { Cocoa: 15, Cappuccino: 13 };
+}());
+
+(function () {
+    var {Cocoa,} = { Cocoa: 15, Cappuccino: 13 };
+    shouldBe(Cocoa, 15);
+}());
+
+(function () {
+    var {Cocoa = 'Cocoa',} = { Cocoa: 15, Cappuccino: 13 };
+    shouldBe(Cocoa, 15);
+}());
+
+(function () {
+    var {Cocoa, Kilimanjaro = 'Coffee'} = { Cocoa: 15, Cappuccino: 13 };
+    shouldBe(Cocoa, 15);
+    shouldBe(Kilimanjaro, 'Coffee');
+}());
+
+(function () {
+    var {Cocoa, Kilimanjaro = 'Coffee'} = {};
+    shouldBe(Cocoa, undefined);
+    shouldBe(Kilimanjaro, 'Coffee');
+}());
+
+(function () {
+    var {Cocoa, Kilimanjaro = 'Coffee',} = { Cocoa: 15, Cappuccino: 13 };
+    shouldBe(Cocoa, 15);
+    shouldBe(Kilimanjaro, 'Coffee');
+}());
+
+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));
+}
+
+testSyntaxError(String.raw`var {,} = {Cocoa: 15}`, String.raw`SyntaxError: Unexpected token ','. Expected a property name.`);
+testSyntaxError(String.raw`var {,} = {}`, String.raw`SyntaxError: Unexpected token ','. Expected a property name.`);