blob: d648b4e2a9b17279acbae7c73954476df1b03541 [file] [log] [blame]
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 = 10, b = 1')", "'const a = 10, b = 1'");
shouldBe("compileAndSerializeLeftmostTest('const a = 1, b = 2')", "'const a = 1, b = 2'");
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 })'");