Migrate more tests from blink repository.

test/webkit/fast/js/function-toString-parentheses.js

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1.  Redistributions of source code must retain the above copyright
+//     notice, this list of conditions and the following disclaimer.
+// 2.  Redistributions in binary form must reproduce the above copyright
+//     notice, this list of conditions and the following disclaimer in the
+//     documentation and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+description(
+"This test checks that parentheses are preserved when significant, and not added where inappropriate. " +
+"We need this test because the JavaScriptCore parser removes all parentheses and the serializer then adds them back."
+);
+
+function compileAndSerialize(expression)
+{
+    var f = eval("(function () { return " + expression + "; })");
+    var serializedString = f.toString();
+    serializedString = serializedString.replace(/[ \t\r\n]+/g, " ");
+    serializedString = serializedString.replace("function () { return ", "");
+    serializedString = serializedString.replace("; }", "");
+    return serializedString;
+}
+
+function compileAndSerializeLeftmostTest(expression)
+{
+    var f = eval("(function () { " + expression + "; })");
+    var serializedString = f.toString();
+    serializedString = serializedString.replace(/[ \t\r\n]+/g, " ");
+    serializedString = serializedString.replace("function () { ", "");
+    serializedString = serializedString.replace("; }", "");
+    return serializedString;
+}
+
+var removesExtraParentheses = compileAndSerialize("(a + b) + c") == "a + b + c";
+
+function testKeepParentheses(expression)
+{
+  shouldBe("compileAndSerialize('" + expression + "')",
+           "'" + expression + "'");
+}
+
+function testOptionalParentheses(expression)
+{
+  stripped_expression = removesExtraParentheses
+        ? expression.replace(/\(/g, '').replace(/\)/g, '')
+        : expression;
+  shouldBe("compileAndSerialize('" + expression + "')",
+           "'" + stripped_expression + "'");
+}
+
+function testLeftAssociativeSame(opA, opB)
+{
+    testKeepParentheses("a " + opA + " b " + opB + " c");
+    testOptionalParentheses("(a " + opA + " b) " + opB + " c");
+    testKeepParentheses("a " + opA + " (b " + opB + " c)");
+}
+
+function testRightAssociativeSame(opA, opB)
+{
+    testKeepParentheses("a " + opA + " b " + opB + " c");
+    testKeepParentheses("(a " + opA + " b) " + opB + " c");
+    testOptionalParentheses("a " + opA + " (b " + opB + " c)");
+}
+
+function testHigherFirst(opHigher, opLower)
+{
+    testKeepParentheses("a " + opHigher + " b " + opLower + " c");
+    testOptionalParentheses("(a " + opHigher + " b) " + opLower + " c");
+    testKeepParentheses("a " + opHigher + " (b " + opLower + " c)");
+}
+
+function testLowerFirst(opLower, opHigher)
+{
+    testKeepParentheses("a " + opLower + " b " + opHigher + " c");
+    testKeepParentheses("(a " + opLower + " b) " + opHigher + " c");
+    testOptionalParentheses("a " + opLower + " (b " + opHigher + " c)");
+}
+
+var binaryOperators = [
+    [ "*", "/", "%" ], [ "+", "-" ],
+    [ "<<", ">>", ">>>" ],
+    [ "<", ">", "<=", ">=", "instanceof", "in" ],
+    [ "==", "!=", "===", "!==" ],
+    [ "&" ], [ "^" ], [ "|" ],
+    [ "&&" ], [ "||" ]
+];
+
+for (i = 0; i < binaryOperators.length; ++i) {
+    var ops = binaryOperators[i];
+    for (j = 0; j < ops.length; ++j) {
+        var op = ops[j];
+        testLeftAssociativeSame(op, op);
+        if (j != 0)
+            testLeftAssociativeSame(ops[0], op);
+        if (i < binaryOperators.length - 1) {
+            var nextOps = binaryOperators[i + 1];
+            if (j == 0)
+                for (k = 0; k < nextOps.length; ++k)
+                    testHigherFirst(op, nextOps[k]);
+            else
+                testHigherFirst(op, nextOps[0]);
+        }
+    }
+}
+
+var assignmentOperators = [ "=", "*=", "/=" , "%=", "+=", "-=", "<<=", ">>=", ">>>=", "&=", "^=", "|=" ];
+
+for (i = 0; i < assignmentOperators.length; ++i) {
+    var op = assignmentOperators[i];
+    testRightAssociativeSame(op, op);
+    if (i != 0)
+        testRightAssociativeSame("=", op);
+    testLowerFirst(op, "+");
+    shouldThrow("compileAndSerialize('a + b " + op + " c')");
+    testKeepParentheses("(a + b) " + op + " c");
+    testKeepParentheses("a + (b " + op + " c)");
+}
+
+var prefixOperators = [ "delete", "void", "typeof", "++", "--", "+", "-", "~", "!" ];
+var prefixOperatorSpace = [ " ", " ", " ", "", "", " ", " ", "", "" ];
+
+for (i = 0; i < prefixOperators.length; ++i) {
+    var op = prefixOperators[i] + prefixOperatorSpace[i];
+    testKeepParentheses("" + op + "a + b");
+    testOptionalParentheses("(" + op + "a) + b");
+    testKeepParentheses("" + op + "(a + b)");
+    testKeepParentheses("!" + op + "a");
+    testOptionalParentheses("!(" + op + "a)");
+}
+
+
+testKeepParentheses("!a++");
+testOptionalParentheses("!(a++)");
+testKeepParentheses("(!a)++");
+
+testKeepParentheses("!a--");
+testOptionalParentheses("!(a--)");
+testKeepParentheses("(!a)--");
+
+testKeepParentheses("(-1)[a]");
+testKeepParentheses("(-1)[a] = b");
+testKeepParentheses("(-1)[a] += b");
+testKeepParentheses("(-1)[a]++");
+testKeepParentheses("++(-1)[a]");
+testKeepParentheses("(-1)[a]()");
+
+testKeepParentheses("new (-1)()");
+
+testKeepParentheses("(-1).a");
+testKeepParentheses("(-1).a = b");
+testKeepParentheses("(-1).a += b");
+testKeepParentheses("(-1).a++");
+testKeepParentheses("++(-1).a");
+testKeepParentheses("(-1).a()");
+
+testKeepParentheses("(- 0)[a]");
+testKeepParentheses("(- 0)[a] = b");
+testKeepParentheses("(- 0)[a] += b");
+testKeepParentheses("(- 0)[a]++");
+testKeepParentheses("++(- 0)[a]");
+testKeepParentheses("(- 0)[a]()");
+
+testKeepParentheses("new (- 0)()");
+
+testKeepParentheses("(- 0).a");
+testKeepParentheses("(- 0).a = b");
+testKeepParentheses("(- 0).a += b");
+testKeepParentheses("(- 0).a++");
+testKeepParentheses("++(- 0).a");
+testKeepParentheses("(- 0).a()");
+
+testOptionalParentheses("(1)[a]");
+testOptionalParentheses("(1)[a] = b");
+testOptionalParentheses("(1)[a] += b");
+testOptionalParentheses("(1)[a]++");
+testOptionalParentheses("++(1)[a]");
+
+shouldBe("compileAndSerialize('(1)[a]()')",
+    removesExtraParentheses ? "'1[a]()'" : "'(1)[a]()'");
+
+shouldBe("compileAndSerialize('new (1)()')",
+    removesExtraParentheses ? "'new 1()'" : "'new (1)()'");
+
+testKeepParentheses("(1).a");
+testKeepParentheses("(1).a = b");
+testKeepParentheses("(1).a += b");
+testKeepParentheses("(1).a++");
+testKeepParentheses("++(1).a");
+testKeepParentheses("(1).a()");
+
+for (i = 0; i < assignmentOperators.length; ++i) {
+    var op = assignmentOperators[i];
+    testKeepParentheses("(-1) " + op + " a");
+    testKeepParentheses("(- 0) " + op + " a");
+    testKeepParentheses("1 " + op + " a");
+}
+
+shouldBe("compileAndSerializeLeftmostTest('({ }).x')", "'({ }).x'");
+shouldBe("compileAndSerializeLeftmostTest('x = { }')", "'x = { }'");
+shouldBe("compileAndSerializeLeftmostTest('(function () { })()')", "'(function () { })()'");
+shouldBe("compileAndSerializeLeftmostTest('x = function () { }')", "'x = function () { }'");
+
+shouldBe("compileAndSerializeLeftmostTest('var a')", "'var a'");
+shouldBe("compileAndSerializeLeftmostTest('var a = 1')", "'var a = 1'");
+shouldBe("compileAndSerializeLeftmostTest('var a, b')", "'var a, b'");
+shouldBe("compileAndSerializeLeftmostTest('var a = 1, b = 2')", "'var a = 1, b = 2'");
+shouldBe("compileAndSerializeLeftmostTest('var a, b, c')", "'var a, b, c'");
+shouldBe("compileAndSerializeLeftmostTest('var a = 1, b = 2, c = 3')", "'var a = 1, b = 2, c = 3'");
+
+shouldBe("compileAndSerializeLeftmostTest('const a = 1')", "'const a = 1'");
+shouldBe("compileAndSerializeLeftmostTest('const a = (1, 2)')", "'const a = (1, 2)'");
+shouldBe("compileAndSerializeLeftmostTest('const a, b = 1')", "'const a, b = 1'");
+shouldBe("compileAndSerializeLeftmostTest('const a = 1, b')", "'const a = 1, b'");
+shouldBe("compileAndSerializeLeftmostTest('const a = 1, b = 1')", "'const a = 1, b = 1'");
+shouldBe("compileAndSerializeLeftmostTest('const a = (1, 2), b = 1')", "'const a = (1, 2), b = 1'");
+shouldBe("compileAndSerializeLeftmostTest('const a = 1, b = (1, 2)')", "'const a = 1, b = (1, 2)'");
+shouldBe("compileAndSerializeLeftmostTest('const a = (1, 2), b = (1, 2)')", "'const a = (1, 2), b = (1, 2)'");
+
+shouldBe("compileAndSerialize('(function () { new (a.b()).c })')", "'(function () { new (a.b()).c })'");